PROCESSES FOR MOLDING PULP PAPER CONTAINERS AND LIDS
A process for molding recyclable, compostable, and disposable containers made of pulp paper is disclosed herein. The process includes disposing a wet pulp layer on a male or female mold, mating the mold with its counterpart, and applying a force on the pulp layer to remove moisture and thin the pulp. The process continues by applying a vacuum to either the male or female mold to hold the pulp layer, and removing the other mold. The process further comprises sequentially mating male and female molds until the pulp layer is the desired thickness and shape of the container. Embodiments of the process may include molding pulp containers to include pleats, stability features, reverse draft features, and puffed pulp configurations.
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This application is a continuation-in-part patent application that claims the benefit of and priority to: U.S. patent application Ser. No. 12/767,765, titled PROCESSES FOR MOLDING PULP PAPER CONTAINERS AND LIDS, filed Apr. 26, 2010, which claims the benefit of and priority to U.S. Provisional Patent Application No. 61/172,965, titled MOLDED PULP PAPER CONTAINER FOR LIQUIDS AND BEVERAGES, filed Apr. 24, 2009; U.S. Provisional Patent Application No. 61/219,712, titled CREATING AND RUNNING A REVERSE DRAFT ON PAPER PULP MOLDING MACHINERY AND SUBSEQUENT POSSIBILITIES FOR FORMING UNIQUE SHAPES AND PROFILES, filed Jun. 23, 2009; and U.S. Provisional Patent Application No. 61/301,934, titled MOLDED PAPER CUP CONTAINER FOR LIQUIDS AND BEVERAGES, filed Feb. 5, 2010; each of which is incorporated herein by reference in its entirety.
TECHNICAL FIELDThe present invention relates to containers made of paper, and more specifically to molding pulp or forming paper to form paper containers. The present invention also relates to containers for disks, and is more particularly concerned with a disk storage tray for storage of a disk.
BACKGROUNDPaper tubs, containers, and cups are made out of pulp, which is inherently fragile when wet, and, accordingly, the standard methods of manufacturing paper containers begin with dry sheets of finished paper. Using a paper cup as an example, paper sheets are first die cut into specific shapes and then wound onto a mandrel. A cylindrical shape is formed, and the pulp paper cup is then glued or sealed at a seam. Next, a base of the cup is die cut and glued or sealed at a base seam adjacent to the cylindrical portion of the cup. Most paper cups and other paper containers have a top edge portion that requires an additional manufacturing step, e.g., creating a lip roll, which provides the container with circumferential strength. In addition, since paper is water permeable, the paper used in containers must be pre-printed and laminated with a water resistant layer, either before or after manufacturing, to ensure the containers are capable of holding food and beverages. Furthermore, paper containers, especially cups, made with this standard manufacturing method often necessitate the use of thermal insulating sleeves to prevent a user from being burned by the hot contents of the container. Manufacturing thermal insulating sleeves requires an additional manufacturing step and additional machining tools. Therefore, the standard method of manufacturing paper containers requires numerous processes and numerous machine tools.
Molding plastic is a less complex method of manufacturing containers. The elasticity of plastic simplifies manufacturing to the following steps: pouring heated plastic into a mold having a desired container shape, allowing the plastic to harden, and removing the hardened plastic from the mold. More complex shapes may also be made during thermo forming of plastics since the elasticity of plastic allows it to bend in different directions and resiliently recover when drawn from a mold. Unfortunately, molding techniques used for plastic containers are generally incompatible with pulp paper because wet pulp is inelastic and fragile. Applying standard molding techniques causes the pulp to tear. Additionally, pulp molding is less capable of attaining complex shapes, e.g., reverse drafts on surfaces, since it cannot elastically recover when drawn from molds. Therefore, it is desirable to have a less complex method for manufacturing paper containers that accommodates the material characteristics of pulp.
Disk storage trays for storage and packaging of disks having a generally centrally situated circular aperture, for example compact disks (CD), digital video disks (DVD), High Definition digital video disks (HD-DVD), and Blu Ray® disks (BD) are well known in the art. Typically, such trays are constructed of injection formed plastic, thermoformed plastic, or molded cellulose pulp, for example molded paper or cardboard. Unfortunately, the use of petrochemical based molded or thermoformed materials, e.g. plastics, for the trays is undesirable due to the negative impact of such materials on the environment. Cellulose or paper materials offer environmentally friendly and sustainable options for making such trays, compared to plastics. However, such cellulose pulp materials generally offer inferior results for disk packaging trays, at least compared to plastics. In particular, trays made from cellulose pulp-based materials typically fail to retain the disk on the tray, via central posts or the like which insert through the aperture, compared to plastic trays. Thus, the disk is often not well retained in the tray for cellulose-based pulp trays, compared to plastic-based trays, increasing the risk that the disk may fall out of the tray during storage and/or transport and be damaged.
Accordingly, there is a need for an improved disk storage tray.
SUMMARYThe present disclosure is directed to a process for molding a pulp container that overcomes problems experienced in the prior art. The present disclosure is further directed to a method of molding a container that is made of recyclable, disposable, and/or compostable cellulose fiber materials. A generally accepted definition of compostable is a material that is able to break down into carbon dioxide, water and biomass at the same rate as paper. Compostable material also does not produce toxic material and is generally able to support plant life.
A container made in accordance with at least one embodiment of the present disclosure may be made from renewable resources that may include recycled materials, biodegradable materials, compostable materials, and organics, e.g., cellulose fiber, tapioca, wood, agricultural recycled crop materials, and plastics, e.g., PLA. The container may also be made from materials including non-organics, e.g., clay, metals, and petro plastics, e.g., silicone, PVC's, and PET styrene. An embodiment in accordance with the present disclosure includes molding a container made of pulp.
Embodiments of the present disclosure include processes for forming molded pulp containers, such as cups and/or lids. Some embodiments may include using molds having greater draft angles than typical molding to accommodate for the fragility of wet pulp. The processes disclosed herein may also result in greater insulation because the resulting pulp container has a less densely formed substrate due to the forming and pressing processes associated with embodiments of the invention. Molded containers manufactured with this process can include a variety of homogeneous and non-homogeneous shapes.
Embodiments in accordance with the present disclosure provide a process for molding containers that include a pleat. Pleats are advantageous since they allow containers to be molded with larger draft angles for easy removal from molds. The pleats are subsequently folded, thereby forming a seam and a container having a smaller draft angle, a smaller diameter, and a greater height than the mold.
Another embodiment of the present disclosure is drawn to processes that include containers having specially shaped edges. For example, cups may include a top edge having a contoured lip or roll. This forms a more desirable drinking surface and makes it easier to connect the cup to a lid.
Still other embodiments in accordance with the present disclosure provide a process for molding a container including a reverse draft feature. For example, lids include reverse draft features to securely connect to containers. Containers themselves also have reverse draft features. Embodiments in accordance with this process include first molding pulp along a horizontal axis to include pleat configurations, gradually bending the pulp to a reverse draft angle using sequential molds, removing the molds, and collapsing the pleats on the pulp to form the reverse draft feature.
It is therefore a general object of the present invention to provide an improved disk storage tray.
An advantage of the present invention is that the disk storage tray is made of pulp cellulose material, such as molded paper or cardboard, that is relatively environmentally friendly compared to plastics.
Another advantage of the present invention is that the disk storage tray is easy to manufacture.
Still another advantage of the present invention is the disk storage tray firmly holds the disk in the tray.
Yet another advantage of the present invention is that the disk may be easily removed and replaced in the tray.
In one aspect, the present invention provides a disk storage tray for a disk having a circular aperture formed therein and defined by an inner disk edge disposed generally centrally on the disk, the tray comprising:
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- generally adjacent and planar first and second tray portions, the tray portions together defining a top side and a bottom side of the tray;
- a connector pivotally connecting the first and second tray portions and upon which the tray portions are pivotal between an extended configuration for the tray, in which the tray portions extend substantially colinearly one another, and a retracted configuration for the tray, in which the tray portions are slanted towards one another on the top side;
- first and second generally opposed central portions extending, respectively, across the first and second tray portions adjacent the connector, each central portion being indented inwardly relative the bottom side; and
- first and second generally opposed posts protruding, respectively, upwardly from the top side adjacent the connector and flaring angularly outwardly relative the connector, the posts being spaced apart from one another at outer top edges thereof at a lesser distance than the diameter of the aperture in the retracted configuration, thereby enabling insertion and removal of the disk by passage of the posts through the aperture, and a greater distance than the diameter of the aperture in the extended configuration, thereby preventing passage of the posts through the aperture and enabling retaining of the disk on the tray.
Other objects and advantages of the present invention will become apparent from a careful reading of the detailed description provided herein, with appropriate reference to the accompanying drawings.
In the drawings, the sizes and relative positions of the elements in the drawings are not necessarily drawn to scale. For example, the shapes of the various elements and angles are not drawn to scale, and some of these elements are arbitrarily enlarged and positioned to improve drawing legibility. Further, the particular shapes of the elements as drawn are not intended to convey any information regarding the actual shape of the particular elements, and have been solely selected for ease of recognition in the drawings. Understanding that these drawings depict only one embodiment of the disclosure and are not therefore to be considered as limiting of its scope, the disclosure will be described and explained with additional specificity and detail through the use of the accompanying drawings.
Appendix A includes prospective views of other molded pulp paper containers in accordance with embodiments of the invention.
From the foregoing, it will be appreciated that specific embodiments of the invention have been described herein for purposes of illustration, but that various modifications may be made without deviating from the spirit and scope of the invention. Accordingly, the invention is not limited except as by the appended claims.
DETAILED DESCRIPTIONThe following describes embodiments of a process for molding a pulp container in accordance with the present disclosure. Embodiments in accordance with the present disclosure are set forth hereinafter to provide a thorough understanding and enabling description of a number of particular embodiments. Several specific details of the disclosure are set forth in the following description and in
Embodiments of processes in accordance with the present disclosure may include molds having tapered surfaces that form a draft angle between the mold and the parting line of the molded material. Draft angles allow for easy removal of the formed container for the mold. For example,
In the subsequent stage of the process illustrated in
In another embodiment in accordance with the present disclosure, the pulp layer 101 is formed directly on the first female mold 103 using with a process similar to the process discussed above. For example, the wet pulp can be initially coated or otherwise disposed on the interior surface of the female mold 103 and a vacuum can be drawn through the mold surface to hold the layer of pulp 101 against the first female mold 103. In this embodiment, the process begins at
The subsequent stages of the process are shown in
In accordance with the subsequent stage of the process shown in
In the next step of the process, the second female mold 105 is removed from the pulp layer 101, which remains on the male mold. This process is similar to that described above with reference to
In accordance with embodiments of the disclosure, the process includes mating additional female molds with the pulp layer on the male mold 104 until the pulp layer 101 is the desired shape and thickness of the cup. The process of mating an additional female mold is similar to the sequence of stages described above with reference to
The next female mold can be configured so that, when combined with the male mold, the molds will have an offset A at the lower portion of the mold that is slightly less than the an offset B at the upper portion molds. This provides greater compression and thinning of the lower portion of the pulp layer during this step of the molding process. The subsequent female molds, when combined with the male mold, may have alternating variations of the offsets A′ and B′ at the lower and upper portions of the mold, respectively Varying the offsets within individual molds and alternating the position of the varied offset of subsequent molds decreases the defects on the completed pulp paper container since the pulp is not continuously compressed against the same portions of the male mold. In the illustrated embodiment, the final pair of female and male molds will have a selected offset, uniform or varied, that provides the desired thickness of the pulp layer for the final product. For example, if the final product is designed to have a uniform thickness, the offset between the final set of female and male molds will have a uniform offset.
In accordance with embodiments of the present disclosure, the process may also include a varying number of molding steps for molding the pulp layer between selected sequential sets of male and female molds depending upon the desired thickness and shape of the container. For example, one embodiment forms the molded pulp product using three molding steps with three sets of sequential pairs of molds, each having increasingly smaller offsets. Other embodiments can includes five to seven sequential molding steps with the selected pairs of male and female molds. Additional embodiments in accordance the present disclosure may include more or less repetitions. In some embodiments, the use of a greater number of molding steps can provide for better throughput in the molding process to provide a greater number of molded pulp products in a selected time period.
The molding process described above with reference to
In accordance with this embodiment of the process, each subsequent male mold has a greater diameter than the previous male mold so as to decrease the offset between the molds, and the number of male molds may vary depending upon the desired thickness and shape of the resulting molded pulp product. Additionally, as described above with reference to female molds, the male molds can be configured to provide varied offsets between different portions of a set of male and female molds, i.e., the lower portion compared to the upper portion of the mold. The positions of the varied offset may alternate between subsequent male molds.
Still further embodiments in accordance with the present disclosure can include alternating the vacuumed surface between male and female molds so that the pulp layer 101 is retained on a male mold at one molding station and then on the female mold at the next molding station. For example, as illustrated in
In operation of one embodiment, the pulp layer 101 is carried by the female mold 403 as discussed above. The male mold 404 is in the initial molding position with the mold segments 406 spaced apart before the male mold is inserted into the female mold. When the male mold 404 is axially inserted into the female mold 403 to compress the pulp layer, the first (bottom mold) segment 410 pressed into the bottom portion of the pulp layer to compress the pulp layer against the female mold. In this position, when the mold segments are still in the initial position, which defined the first drat angle, the mold segments provide some compressive forces against the pulp layer. The remaining mold segments 412-420 are then moved axially along the central shaft until the segments are stacked upon each other and in the final mold position. As the mold segments are moving to the final mold position, the effective draft angle of the male mold increases and the segments provide increased wedging and compression forces against the pulp layer that drives moisture from the pulp layer 101 and further thins the pulp layer. In one embodiment, the mold segments 412-420 can all be substantially simultaneously moved into the final mold position. In another embodiment, the mold segments can be moved sequentially into to their respective final mold positions. Although the illustrated embodiment shows male and female molds with a cup shape, other embodiments can provide molds for forming molded pulp containers with other shapes.
As shown in
Additional embodiments in accordance with the present disclosure include processes for molding pulp products having non-cylindrical features. For example,
Each of the above embodiments may further include a process for forming an upper edge feature on a container.
Still other embodiments of the present disclosure include processes for forming a container with a reverse draft. As described above, a reverse draft feature is one whose angle runs against the draw of the mold.
As shown in
In the process described above, three sequential male and female molds move the reverse draft feature from a horizontal plane to the vertical plane, thereby creating the bump 910 at a negative draft angle. However, it should be noted that more or less pairs of molds may be used to create a reverse draft feature. For example, each sequential pair of molds may change the angle of a pulp layer only a few degrees until the desired reverse draft feature is obtained. As discussed above, each additional mold set decreases offset to apply force to the pulp and extract excess moisture. Additionally, the offset may be varied within individual molds and alternate between sequential molds in order to decrease the defects transferred to the pulp.
In additional embodiments illustrated in
An additional embodiment in accordance with the present disclosure includes a process for forming a pulp product or a portion of a pulp product with a less dense construction, referred to as a puffed pulp construction. In some embodiments, this puffed pulp construction can be used to form portions that will elevate a reverse draft feature, such as on a container or a lid.
As illustrated in
This process of molding a pulp product with the puffed pulp process can be used to provide a wide range of products, including containers with or without lids. For example, the puffed pulp configuration can be used when forming a lid to provide a reverse draft feature that can engage a rim of a cup or other container.
All of the above processes may include heating the male and/or female mold. Heating the molds during the vacuum and the pressurized air application stages of the process facilitates a more rapid removal of the moisture from the pulp by turning it into steam. Adding heat is also advantageous in containers having a reverse draft feature as described above because it increases the memory of the pulp, thereby making it easier for the pulp layer to collapse from its horizontal orientation to its desired position after removal from the molds.
In each of the above embodiments, subsequent processes may be applied to the molded containers. For example, the containers may be printed, coated with a waterproof coating, and die cut. A coating may be applied to the containers while a vacuum holds a pulp layer against either the male or female mold. This has the additional advantage of assisting the coating in adhering to the container because the vacuum operates through the pours of the pulp paper container. The processes may further include applying a smooth and pleasing surface by using heat and press-in-place techniques. In additional embodiments, other surfaces and/or textures can be added to the container.
Each of the pulp molding processes described above may be performed by machines. These machines may include linear distribution lines wherein pulp layers are molded between male and female molds along an assembly line. The machines may also include circular revolving molds. It should be noted that any suitable machine for sequentially molding pulp into a container may be used to accelerate the process.
With reference to the annexed drawings the preferred embodiments of the present invention will be herein described for indicative purpose and by no means as of limitation.
Reference is now made to
The tray portions 12a, 12b are pivotally, and preferably resiliently, connected to one another by connector 20 disposed therebetween. For the embodiment shown, the connector 20 is a crease or fold 20 formed in the cellulose pulp material and which extends contiguously adjacent and between the tray portions 12a, 12b from one tray side 22 to the other tray side 22. More specifically, the crease 20 is of lesser thickness and rigidity than the tray portions 12, such that than the tray portions 12a, 12b can pivot thereon relative one another. Thus, for the embodiment shown, the tray 10, including tray portions 12 and connector 20, are formed from a single piece of molded cellulose pulp material, with the connector 20 extending generally centrally between the tray portions 12. It should be noted, however, that the connector could be formed from hinges or other pivotal connection means.
Preferably, the tray portions 12a, 12b are mirror images of one another and, preferably, are sized and shaped such that at least a portion, and preferably the entire surface area, of the disk 18 can be completely seated on the tray 10 with the top side 14 extending thereunder. Additionally, the trays portions 12 are, preferably, rectangular in shape, thus rendering the overall tray 10 preferably rectangular in shape.
Referring now to
Reference is now made to
The posts 30 are spaced part from one another and positioned such that, when the tray 10 is in retracted configuration 40, the outer top edges 36, 36 are at a lesser distance X1 than the diameter X3 of disk aperture 44. Thus, in the retracted configuration 40, the posts 30 may pass between circular disk inner rim 46, and thereby through the disk aperture 44 defined by the rim 46. Accordingly, when the tray 10 is in the retracted configuration 40, the disk 18 can be removed from the tray 10 or seated thereon and the posts 30 extended through the aperture 44. Conversely, the posts 30 are also spaced apart and positioned such that, in the extended configuration 42, the outer top edges 36, 36 are at greater distance X2 from one another than diameter X3 and the outer post walls 34 are spaced apart one another adjacent the top side 12 at a distance approximately equal to or slightly less than X3. Thus, when the tray 10 is in the extended configuration 42, a disk 10 previously inserted thereon in the retracted configuration 40 with the outer posts walls 34 extending through the aperture 44 cannot be removed as the walls 34 extend through the aperture 44, generally in snug abutment with the disk inner edge 46 proximal the top side 14 and overlaying the disk inner edge 46 at outer top edges 36. Specifically, in the extended configuration 42, the top outer edges 36 prevent passage of posts 36 through aperture 44 of disk 18.
In use, to seat a disk 18 on the tray 10, the tray portions 12 are moved slightly, i.e. vertically flexed, in direction D1 to place the tray 10 in the retracted configuration 40 such that the posts 30 are radially compressed towards one another to pass through aperture 44 as described above. The tray portions 12 are then moved in direction D2, i.e. flattened, to place the tray 10 in extended configuration 42 in which posts 30 are radially expanded to prevent removal of disk 18, as described above. To remove the disk 18, the tray portions 12 are again moved slightly in direction D1 to place the tray 10 in the retracted configuration 40, such that the posts 30 can pass through aperture 44.
Advantageously, as the ridges 26 are indented within the bottom side 16, they are raised, i.e. elevated, relative any generally planar surface 50 upon which the bottom side 16 of tray 10 may rest. Thus, when the tray 10 is placed on the surface 50, say a table top or shelf, with the bottom side 16 facing the surface 50, the ridges 26, posts 30, and connector 20 are spaced apart, and notably elevated, relative the surface 50. Accordingly, by simply applying a force F on the posts 36 or on the connector 20 between posts 36, a user may cause the tray portions 12 to pivotally flip towards one another in direction D1 as the connector 20 and posts 36 move towards the surface 10, thus placing the tray 10 in the retracted configuration 40 to enable seating and removal of the disk 18. To return the tray 10 to the extended configuration 42, a user has simply to release the force F, allowing gravitational force to move tray portions 12 in direction D2. Use of the resilient crease 20, biasing in direction D1 as connector 20 further facilitates placement of the tray 10 back and forth between extended and retracted configurations 40, 42. Conveniently, respective inner post wall 52 of each post 30 also flairs outwardly and angularly away relative the connector 20, thus reducing risk that these walls 52 will prevent movement in direction D1, for example by being blocked by a user's finger, which might impede placing of the tray 10 in the retracted configuration 40.
Optionally, but preferably, the tray 10 has two pairs of first and second support legs, generally 54a, 54b, extending outwardly on the bottom side 16 at the ridge 26, and forming leg indentations 56 in the top side 14. The support legs 54a, 54b of each pair are generally opposite and facing one another with the connector 20 extending adjacently therebetween, each pair of legs 54 being situated preferably adjacent a tray side 22 with the posts 30 situated between the pairs. As opposed to posts 30, the support legs 36 flair, i.e. are slanted, angularly inwardly from the bottom side 16 towards the connector 20 and have rounded leg ends 58. The legs 54a, 54b provide additional space between the posts 30 and connector 20 and surface 50 and thus provide additional room for connector 20 and posts 30 to move towards surface 50 when force F is applied. Thus, the legs 54 provide for additional movement of tray portions 12 in direction D1 and facilitate such movement towards the retracted configuration 40 on surface 50. Further, as the posts 30a, 30b are compressed towards one another by movement of tray portions 12 in direction D1, the legs 54a, 54b, and notably rounded leg ends 58 of each pair move away from one another, facilitated by rounded character of leg ends 58. Due to slanted configuration of the legs 54, when the tray 10 on surface 50 is in retracted configuration 40, the legs 30 extend generally perpendicular the surface 50, providing firm support for the tray 10 thereon and facilitating removal and seating of disk 18 thereon. At the same time, once the force F is released the support legs 30 are moved back towards one another as tray portions 12 move in direction D2 driven by gravitational force or by user. Thus, the legs 54, in combination with the connector 20 and posts 30, provide a spring flex mechanism for moving the tray between extended and retracted configurations 42, 40.
Reference is now made again to
An additional outer cavity 84 on each tray portion 12 may extend on top side 14 from the perimeter protrusion 74 between tray side 22 to tray end 38. Tray side wall ridges 92 and tray end wall ridges 94 on top side, and corresponding indentations 96 and 98 may be, respectively, formed at tray sides 22 and tray ends 38. In particular, tray side wall ridges 92 provide side walls 92 which may abut one another in extended configuration 42, thus preventing excessive movement in direction D2.
The tray 10 is manufactured by molded pulp forming of the cellulose pulp in the retracted configuration 40, which helps to avoid creation of any difficult to manufacture reverse angles. Specifically, this forming technique allows for forming of the tray 10, including all of the posts 30, legs 54, protrusions 54, 62, ridges 26, connector 20, and any corresponding indentations 28, 32, 56, 68, 76, cavities 60 described above, in the positive and not the negative. Advantageously, as the tray 10 is constructed of a single molded piece of cellulose pulp, with each post 30, legs 65, protrusion 54, 62, and ridge 26 having corresponding indentations 28, 32, 56, 68, 76, the tray 10 can be formed by simply interposing of top and bottom molds, not shown, having corresponding mold protrusions and indentations onto the pulp and subsequently curing the pulp to form the tray 10 in the molds.
Although the present disk holding tray has been described with a certain degree of particularity, it is to be understood that the disclosure has been made by way of example only and that the present invention is not limited to the features of the embodiments described and illustrated herein, but includes all variations and modifications within the scope and spirit of the invention as hereinabove described.
From the foregoing, it will be appreciated that specific embodiments of the disclosure have been described herein for purposes of illustration, but that various modifications may be made without deviating from the disclosure. Furthermore, aspects of the disclosure described in the context of particular embodiments may be combined or eliminated in other embodiments. Further, while features and characteristics associated with certain embodiments of the disclosure have been described in the context of those embodiments, other embodiments may also exhibit such features and characteristics, and not all embodiments need necessarily exhibit such features and characteristics to fall within the scope of the disclosure. Accordingly, the disclosure is not limited, except as by the appended claims.
Claims
1. A process for making a molded pulp disk tray comprising:
- disposing a pulp layer on a first mold;
- mating a second male mold with the first mold, the first and second molds being separated by a first offset and configured to exert a compressive force on the pulp layer to remove moisture and thin the pulp layer;
- drawing a vacuum through the second mold, the vacuum being configured to hold the pulp layer against the second mold;
- removing the first mold from the second mold and the pulp layer;
- mating a third mold with the second mold, the second and third molds being separated by a second offset, less than the first offset and configured to exert a compressive force on the pulp layer to further thin the pulp layer;
- drawing a vacuum through one of the second and third molds, the vacuum being configured to hold the pulp layer against the one of the second and third molds; and
- removing the other one of the second and third molds from the one of the second and third molds with the pulp layer thereon.
2. The process of claim 1 wherein the pulp layer is first disposed on a forming mold, mated with the first mold, and the forming mold is removed by drawing at least one of a vacuum through the first mold and pressurized air through the forming mold.
3. The process of claim 1, further comprising:
- applying pressurized air through at least one of the first and third molds when they are removed from the second mold.
4. The process of claim 1 wherein the first offset is greater in upper portions of the first and second molds and smaller in lower portions of the first and second molds, the process further comprising:
- varying the portions of subsequent male and female molds having a greater offset; and
- decreasing the size of subsequent offsets.
5. The process of claim 1, further comprising:
- repeating the mating and removing of subsequent molds until the container is a desired thickness and shape.
6. The process of claim 1, further comprising:
- repeating the mating and removing of subsequent molds;
- alternating the mold on which the vacuum operates to hold the pulp layer.
7. The process of claim 1, further comprising:
- mating a fourth mold with the second mold, the pulp layer having a portion extending beyond the fourth mold;
- drawing a vacuum through the fourth mold, the vacuum being configured to hold the pulp layer against the fourth mold;
- removing the second mold;
- mating a fifth mold with the fourth mold, the fifth mold having an upper portion configured to mold the portion of the pulp layer extending beyond the fourth mold at least partially against the fourth mold; and
- repeating the mating and removal of subsequent mating molds configured to mold the portion of the pulp extending beyond the fourth mold at least partially against the subsequent mating molds.
8. The process of claim 1 wherein first, second and third molds each have a draft angle, the draft angle configured to prevent the pulp layer from tearing when it is removed from at least one of the first, second and third molds.
9. The process of claim 1 wherein first, second and third molds have at least one indentation configured to form at least one pleat on the container.
10. The process of claim 1 wherein the first, second and third molds have a plurality of indentations configured to form a plurality of pleats on a circumference of the pulp layer, the process further comprising:
- molding a plurality of pleats about a circumferential portion of the pulp layer, wherein at least a portion of the pleats provides a reverse draft feature positioned at a negative draft angle.
11. The process of claim 10 wherein at least one of the first, second and third molds has a reverse draft portion with a greater porosity and a greater offset than the remainder of the mold, the reverse draft portion being configured to create a less dense pulp portion.
12. The process of claim 1 wherein the first, second and third molds are configured to imprint a pattern onto the pulp layer.
13. The process of claim 1 wherein first, second and third molds include angular lower portions, the angular lower portions configured to form stability features on the paper container.
14. The process of claim 1, further comprising:
- heating at least one of the first, second and third molds during mating.
15. The process of claim 1, further comprising:
- heating at least one of the first, second and third molds while a vacuum is applied to hold the pulp layer against it; and
- applying a coating to the pulp layer.
Type: Application
Filed: Jun 22, 2010
Publication Date: Jan 20, 2011
Applicant: Seanet Development, Inc. (Bellevue, WA)
Inventors: David Pierce (Renton, WA), Edward Urquhart (Bellevue, WA)
Application Number: 12/821,054
International Classification: D21J 3/00 (20060101);