Abstract: A container (30d) of polyethylene terephthalate or similar thermoplastic material has a container body (32d), a mouth portion (37d) and a central bottom part (34d). The central bottom part consists of chiefly amorphous and/or thermocrystallized material and forms a bulge directed towards the interior of the container. A ring-shaped or band-shaped standing surface (36d) is arranged adjacent the transition of the bottom part into the container wall (32d). Adjacent to the standing surface the container has a circumferential area of material (35d) which by stretching and/or reshaping has undergone flow and by heating has acquired built-in stresses which tend to contract it. The surrounding circumferential area of material prevents the inward bulge of the central bottom part from straightening out and/or turning inside out when the pressure in the container is increased and/or when the temperature of the container material is raised.

Abstract: Apparatus for producing a container from a tubular blank of polyethylene terephthalate or similar material, according to which a polyethylene terephthalate blank is stretched at least approximately 3-fold to produce a preform (20). In an axial section through the preform, the contour length substantially corresponds to the contour length in an axial section through the final container. The preform (20) is heated to a temperature above the glass transition temperature (TG) and is converted to the container (21) in a blow mold (12). In doing so, the contour length of the material is maintained through successive reduction of the axial length of the body (23) which the preform constitutes during the conversion to the container. In order to achieve this, the base portion of the blow mold (11) is moved towards the orifice (22) of the final container.

Abstract: A method of forming bottomed cylindrical bodies, which can be used conveniently as preforms for the production of containers by stretch blow-molding, etc., from a cylindrical body of thermoplastic resin. The method includes a softening step of heat-softening an axially intermediate part of the cylindrical body, a necking step of necking the axially intermediate part of the cylindrical body radially inwardly, said necking step being carried out subsequently to, or simultaneously with, the softening step, a cutting step of cutting the axially intermediate part of the cylindrical body necked radially inwardly in the necking step, thereby to divide the cylindrical body into two members, and a fusing step of heat-melting the cut end portion of each of the two members and fusing the cut end portion.

Abstract: A molded, thermoplastic container having a pressure dome section in an end wall to permit the container to hold pressurized fluids. An integral dispensing spout may be provided which preferably is collapsible to nest within the container, and having sanitary seal means over the spout. An annular ring structure around the pressure dome section may be provided to permit the container to stand on an end during filling and storage. Method and apparatus are included for forming the pressure dome section in a previously molded thermoplastic end wall, for collapsing a dispensing spout to a nested position within the container, and for pressure testing the container.

Abstract: A hollow blow-molded bottle-shaped container of a biaxially oriented polyethylene terephthalate which advantageously has a crystallized outer peripheral portion at the neck portion except the boundary between the neck portion and the body portion and non-crystallized inner peripheral portion thereat. This bottle-shaped container is molded by a method of molding the same, which method advantageously has the steps of injection-molding a piece or parison formed at the outer peripheral surface of a neck root part forming portion in a downwardly flared tapered shape, and crystallizing by a heat treatment the outer peripheral surface portion of the neck root part forming portion. Thus, the deterioration in the physical properties of the neck and shoulder portions of the bottle-shaped container thus finally blow-molded can be reduced.

Abstract: Spherulites are grown in such sections as neck, neck end, bottom center and/or bottom periphery of a hollow bottle-shaped container of biaxially oriented-blow molded polyethylene terephthalate (PET) resin where the resin is not substantially subjected to orientation, thereby to improve the thermal resistance, stiffness and content resistance of such sections to almost the same extent as the biaxially oriented sections of the container such as the shoulder and cylindrical sections thereof. The aforesaid non-oriented sections of the preformed piece before being blow-molded or of the blow-molded container are first heated at or above the glass transition temperature of the resin for about 2-8 minutes and are then annealed at room temperature, with the result that such sections have a spherulite texture of an increased density and are rendered opaque.

Abstract: For heat-setting tubular articles (such as can bodies) of an at least partly biaxially oriented crystallizable polymer, preferably a saturated linear polyester such as polyethylene terephthalate, e.g. for thermally processable food containers, a tube of the polymer is fitted over a mandrel and clamped at its ends to the mandrel at a temperature below the glass transition temperature of the polymer. The tube is then heated, e.g. by inserting a heater 28 into the interior of the mandrel, above the temperature to which it is to be heat-set (at least 60.degree. C. above for PET) whereupon it shrinks into contact with the mandrel but is restrained from axial or further radial shrinkage. The tube and mandrel are cooled to below the heat-set temperature and the tube may then be cut into can body sections by knives engaging in circumferential grooves. Contact between the tube and mandrel is released, e.g.

Abstract: Spherulites are grown in such sections as neck, neck end, bottom center and/or bottom periphery of a hollow bottle-shaped container of biaxially oriented-blow molded polyethylene terephthalate (PET) resin where the resin is not substantially subjected to orientation, thereby to improve the thermal resistance, stiffness and content resistance of such sections to almost the same extent as the biaxially oriented sections of the container such as the shoulder and cylindrical sections thereof. The aforesaid non-oriented sections of the preformed piece before being blow-molded or of the blow-molded container are first heated at or above the glass transition temperature of the resin for about 2-8 minutes and are then annealed at room temperature, with the result that such sections have a spherulite texture of an increased density and are rendered opaque.

Abstract: A method is disclosed for thermally conditioning an essentially tubular parison of polyethylene terephthalate material to a desired orientation temperature at which the polyethylene terephthalate material can be biaxially stretched. The method comprises the steps of heating the parison by applying heat to the exterior surface thereof until the surface reaches a maximum heating temperature less than the temperature at which the polyethylene terephthalate material begins to crystalize and then cooling the heated exterior surface of the parison to remove the heat therefrom while the heat within the wall of the parison diffuses therethrough to raise the temperature of the opposing interior surface toward the desired orientation temperature.

Abstract: A method of producing a saturated polyester resin bottle having a white-patterned wall by bringing at least one heat absorbing member into partial contact with a transparent tubular parison of a saturated polyester resin, when the tubular parison is heated, so that the portions of the saturated parison other than that contacting with the heat absorbing member may be heated to a relatively high temperature and may be locally crystallized to leave a desired white pattern. The bringing operation of the heat absorbing member is accomplished by inserting the heat absorbing member attached to a stem into the tubular parison thereby to prevent the portion of the tubular parison contacting with the heat absorbing member from turning locally white. The aforementioned relatively high temperature is higher than the glass transition temperature and lower than the crystallization temperature of the saturated polyester resin used.

Abstract: A plastic bottle made of biaxially oriented polyethylene terephthalate comprises a narrow neck portion, a downwardly and outwardly flared shoulder portion continuous from the neck portion, a generally cylindrical body portion and a bottom portion, wherein said portions except for the neck portion have a density of at least 1.375, and the internal volume increase rate is less than 5% when the bottle filled with a liquid at 20.degree. C. containing a 2 gas volume of carbon dioxide gas is immersed in warm water at 75.degree. C. for 30 minutes.

Abstract: A process for producing a stretched multilayer polyester bottle which comprises axially stretching a bottomed multilayer preform comprised of an inside and an outside polyester surface layer and an interlayer of a gas-barrier resin provided therebetween optionally through an adhesive under conditions which induce molecular orientation of the polyester and simultaneously stretching it circumferentially by blowing. The multilayer preform is produced by coating a solution or emulsion of an ethylene-vinyl alcohol copolymer on one surface of a primary preform of the polyester molded in advance, drying the coated preform at a temperature at which no whitening owing to the crystallization of the polyester occurs to thereby form a thin but continuous film of the ethylene-vinyl alcohol polymer on the primary preform, mounting the coated pre-form on an injection mold, and injection the polyester onto the coated layer to form the inside or outside surface layer of the polyester.

Abstract: A process of producing a tubular pre-moulding of a thermoplastic material, suitable for subsequent shaping to form containers by a rolling process. The material in a part of a tube is axially oriented as a result of reducing the wall thickness by applying an external pressure which causes the material to flow. The oriented material is moulded by a blow-moulding process into future mouth parts and parts of adjacent neck sections, preferably from two blank parts, joined to one another, of pre-mouldings, the blank parts in the transition between the two mouth parts being severed in order to form two separate blank parts, so that, after closing one end and, if necessary, reworking in order to obtain the requisite closing faces at the other end, the two blank parts each form a tubular pre-moulding.

Abstract: This invention relates to a method of fabricating a bottle-shaped container of saturated polyester having superior mechanical strength, very low degrees of age and high temperature deformation, and superior dimensional stability. The piece for forming the bottle-shaped container is heated to an orientation temperature, is biaxially oriented in a blowing mold and is then thermally set by maintaining the outer wall surface of the expanded container in contact with the inner wall surface of the mold, which is kept at a temperature in the range between the glass transition point and the crystallization temperature, for longer than 5 seconds. The blowing mold is formed with the size adjusted in capacity by approx. 6% to allow for shrinkage of the product container when the container is exposed to a high temperature greater than 70.degree. C. and then left to stand, so as to thereby obtain a container of accurate capacity.

Abstract: This relates to the removal of indentations in the sealing surfaces of plastic bottles, particularly blow molded bottles. The neck finish of each bottle, as it moves along a discharge conveyor from a blow molding machine, is heated to a temperature approaching the glass transition temperature of the plastic material, at which temperature the memory of the plastic material begins to induce slight flow and wherein the indentations are eliminated by the flow of the plastic material of the sealing surface.

Abstract: Apparatus for producing a tubular premoulding of a thermoplastic material, suitable for subsequent shaping to form containers by a rolling process. The material in a part of a tube is axially oriented as a result of reducing the wall thickness by applying an external pressure which causes the material to flow. The oriented material is moulded by a blow-moulding process into future mouth parts and parts of adjacent neck sections, preferably from two blank parts, joined to one another, of pre-mouldings, the blank parts in the transition between the two mouth parts being severed in order to form two separate blank parts, so that, after closing one end and, if necessary, reworking in order to obtain the requisite closing faces at the other end, the two blank parts each form a tubular pre-moulding.

Abstract: Disclosed is a process of making an oriented and heat set blow molded bottle of poly(ethylene terephthalate) so that the bottles resulting from the process have a density over 1.3860 cc./gm. and an onset-of-shrinkage temperature over 80.degree. C. In the process preform preheated to a temperature suitable for orientation is biaxially stretched in a blow mold and then while the hollow article walls are still in contact with the blow mold walls, the article is raised to a higher heat setting temperature in the range of 200.degree.-250.degree. C. (except for the neck) thus heat setting the bottle, and while the article is still at a shrinkage resisting pressure exceeding atmospheric cooling the article to a temperature at which it maintains its shape when not pressurized but not below 100.degree. C. It is also particularly disclosed that this cooling step can be done outside the mold.

Abstract: The heated end of a parison is brought into a finish mold form to shape a finish profile suitable for setting up a closure. The parison is axially stretched by a stretch pin to pull out the heated plastic material adjacent the profile to a thinner cross section. This allows to obtain a considerable saving of weight of the plastic material.

Abstract: This invention relates to process for preparing saturated polyester resin bottles, that the residual strain of the bottles is reduced and the deforming temperature is elevated. The process is that a heated intermediate material (1) made of a saturated polyester resin is set in a mold (5), then compressed air is blown in the intermediate material (1) to orient the same biaxially, temperature in thus shaped bottle is elevated to a temperature higher than the heating temperature of the intermediate material (1) under the elevated pressure to effect thermal fixing and thereafter the saturated polyester resin bottle (19) is taken out.

Abstract: A bottle-shaped container of saturated polyester having frosted or ground surface is manufactured by the steps of heating the outer layer portion of the injection-molded preformed piece to thereby crystallize the outer layer portion to opacify in white, and blow-molding the preformed piece in a blowing mold having at least part of its inner surface formed with rough surface sandblasted in advance to thereby form the rough surface on the bottle-shaped container on the crystallized outer layer portion surface. Thus, the bottle-shaped container incorporates pearl-like ground surface desired in a shape on the surface instead of the glossy surface peculiar to synthetic resin.

Abstract: A method of strengthening the neck portion of a hollow blow-molded bottle-shaped container of a biaxially oriented polyethylene terephthalate resin, which has the steps of heating the neck portion from 140.degree. to 170.degree. C., inserting a die pin of a predetermined shape into the opening of the neck portion, blowing cooling air to the neck portion, thereby shrinking and whitening the neck portion. Thus, the method prevents improper shrinkage deformation of the neck portion due to the thermal influence of the bottle-shaped container.

Abstract: Herein disclosed are a bottle of a saturated polyester resin and its method of production. According to the method of the present invention, saturated polyester resin is injection-molded into a parison which is composed of a mouth and a barrel. The mouth of the parison is oriented in the direction of the axis of the parison and in a direction perpendicular to the parison's axis by means of an orienting jig. The barrel of the parison is biaxially oriented by a blow-molding process. The bottle thus produced has been oriented as a whole.

Abstract: A synthetic resin bottle produced by blow-molding a parison of a synthetic resin. In the blow-molding process of the parison, the portion of the parison supporting the handle is prevented from being expanded, thereby to sufficiently increase the supporting strength of the handle. Since the bottle product has its drum recessed in the vicinity of the handle, the grip of the handle can be facilitated.

Abstract: A method of heating a parison neck by stretching blow molding, wherein an injection molded synthetic resin parison is adjusted in temperature while holding a parison neck, by a neck mold for molding a parison neck, after which the parison is stretched and expanded to form a container such as a bottle, the method comprising at the time of adjusting temperature of said parison, heating a lower end of the neck mold and applying heat enough to prevent formation of an annular constriction in a molded product, to a border between a parison neck covered by the neck mold through the end of said neck mold and a body.

Abstract: A method for producing a hollow synthetic resin article, which comprises opening a split mold having an inner molding surface with a contour conforming to the configuration of the desired article, feeding a heated molding material of a thermoplastic synthetic resin in the form of a tube or two parallel-laid sheets into a space between the opposing mold members of the split mold, applying a negative pressure to vacuum suction holes provided in the molding surfaced and the parting surfaces of the split mold to vacuum-form the molding material, and while the negative pressure is being applied or after the application of the negative pressure is stopped, closing the mold to form the molding material into the final desired configuration.

Abstract: A method of orienting the neck of a bottle of a saturated polyester resin so as to enhance the physical properties and durability of the neck. The neck orienting method includes the step of inserting an orienting rod having a taper head into the neck which is being heated. The neck orienting method may include the step of orienting only the mouth edge of the neck.

Abstract: Herein disclosed are a bottle of a saturated polyester resin and its method of production. According to the method of the present invention, saturated polyester resin is injection-molded into a parison which is composed of a mouth and a barrel. The mouth of the parison is oriented in the direction of the axis of the parison and in a direction perpendicular to the parison's axis by means of an orienting jig. The barrel of the parison is biaxially oriented by a blow-molding process. The bottle thus produced has been oriented as a whole.

Abstract: Herein disclosed is a method of orienting the neck of a bottle of a saturated polyester resin so as to enhance the physical properties and durability of the neck. The neck orienting method includes the step of inserting an orienting rod having a taper head into the neck which is being heated. The neck orienting method may include the step of orienting only the mouth edge of the neck.

Abstract: A machine for high rate production of molecularly oriented thermoplastic bottles is disclosed. The machine is of the reheat-and-blow type. A blow molding station simultaneously blow molds article preforms arranged in matrices by modular article carriers for conveying the preforms and articles through the machine. The carriers are designed to retain the preforms throughout all operations of the machine from a preform load station through a thermal conditioning section, a blow molding station, and to a bottle eject station, thereby eliminating the need for other preform transferring apparatus. The article carriers together with the associated conveying apparatus comprise a sufficiently flexible structure that minor misalignments of the carriers with the blow molding mechanism do not adversely affect bottle production. Both loading of preforms and ejection of finished bottles are accomplished by operation upon matrices of preforms and bottles as defined by the carriers and conveyor lanes.

Abstract: The invention relates to a tubular pre-moulding of a thermoplastic, suitable for subsequent blow-moulding shaping to give containers, and to a process and equipment for producing such pre-moulding. In a tube, future mouth portions and portions of adjacent neck sections are moulded to pre-mouldings, preferably from two mutually joined blank parts, by an axial stretch process and a blow-moulding process, the parts in the transition between the mouth portions being severed in order to form two separate blank parts. A tubular pre-moulding is produced after closing one end of the particular blank part and, if necessary, reworking in order to obtain the requisite closing face at the other end.

Abstract: Spherulites are grown in such sections as neck, neck end, and bottom center or bottom periphery of a hollow bottle-shaped container of biaxially oriented-blow molded polyethylene terephthalate where the resin is not substantially subjected to orientation, thereby to improve the thermal resistance, stiffness and content resistance of such sections to almost the same extent as the biaxially oriented sections of the container such as shoulder and cylindrical sections thereof. The aforesaid sections of the preformed piece before being blow-molded or of the blow-molded container where the resin is not substantially subjected to orientation are first heated at 120.degree.-180.degree. C. for 3-8 minutes and then annealed at room temperature, with a result that such sections have a spherulite texture of an increased density and are opacified to white or milky white.

Abstract: Spherulites are grown in such sections as neck, neck end, and bottom center or bottom periphery of a hollow bottle-shaped container of biaxially oriented-blow molded polyethylene terephthalate where the resin is not substantially subjected to orientation, thereby to improve the thermal resistance, stiffness and content resistance of such sections to almost the same extent as the biaxially oriented sections of the container such as shoulder and cylindrical sections thereof. The aforesaid sections of the preformed piece before being blow-molded or of the blow-molded container where the resin is not substantially subjected to orientation are first heated at 120.degree.-180.degree. C. for 3-8 minutes and then annealed at room temperatures, with a result that such sections have a spherulite texture of an increased density and are opacified to white or milky white.

Abstract: An apparatus for cooling a transfer mandrel on whose top portion a thermoplastic resin parison is mounted and which is rotatably engaged with the peripheral portion of a rotary table. The apparatus is arranged along the peripheral portion of the rotary table adapted to rotate oppositely to a heating means. The apparatus comprises a cooling block having a cavity through which cooling water flows and a concave surface opposing to the transfer mandrel which has a profile conforming to the cylindrical portion of the transfer mandrel, means for adjusting the position of the cooling block, and a spring which pushes a surface portion opposite said concave surface of the cooling block.

Abstract: Herein disclosed are a bottle of a saturated polyester resin and its method of production. According to the method of the present invention, saturated polyester resin is injection-molded into a parison which is composed of a mouth and a barrel. The mouth of the parison is oriented in the direction of the axis of the parison and in a direction perpendicular to the parison's axis by means of an orienting jig. The barrel of the parison is biaxially oriented by a blow-molding process. The bottle thus produced has been oriented as a whole.

Abstract: A process for producing a hollow vessel having a frosted glass-like surface which comprises molding a crystalline thermoplastic polyester copolymer comprising units of ethylene terephthalate as the main component into a transparent parison, crystallizing at least the surface layer portion of the parison and then subjecting it to blow molding.

Abstract: A method is disclosed for blow molding poly(ethylene terephthalate) preforms, such as injection molded parison, to achieve exterior surface embossed designs on blown containers without using profiled blow mold cavity walls. In the method, a raised profile is molded or otherwise formed on the exterior wall of the preform, defining a preform wall portion having embossed areas. Then the entire preform is heated to blowing temperature and it is also disclosed that when the raised portion is at the same time raised to a higher temperature the embossed design of the preform is opacified by crystallization without crystallizing the balance of the preform. Thereafter, the preform is blow molded under conditions such that the poly(ethylene terephthalate) material strain hardens in order to cause the different wall thicknesses to expand and stretch essentially proportionately.

Abstract: A device for expanding heat-shrinkable polymer tubes includes inlet and outlet chambers coaxially and consecutively arranged for immediate contact in the direction of tube advancement. Each chamber is made up of adjoining bushes having threads at the inner surface thereof. The threads of adjacent bushes of each chamber are of the opposite direction. A group of bushes of each chamber having a common thread direction is provided with an independent rotating drive.

Abstract: A process of producing a reinforced container of thermoplastic material in which a blank is pre-heated from an amorphous structure and finished in a subsequent blowing process with biaxial stretching, wherein it is provided simultaneously with internal reinforcing ribs.

Abstract: A collapse resistant polyester container is provided for hot fill applications employing product fill temperatures up to about 190.degree. F. (87.8.degree. C.) or more. The container has at least one region which is thermoelastically deformable inwardly after the container is hot filled and sealed to offset the pressure forces which tend to collapse the container as the contents cool and create an internal vacuum. The thermoelastic region is preferably formed in a two step molding process in which the region is formed and heat set at a first position and then reformed outwardly to a second position and cooled in that position.

Abstract: A process for producing molecularly oriented hollow bodies of thermoplastic material presenting an accurately dimensioned orifice collar, by blow molding a preform in a manner to produce the orifice collar in its definitive form and, after thermally conditioning the preform, finally blow molding the desired final hollow body while forming the lower molded part of the neck below the orifice collar. This process permits the production of oriented hollow bodies with which a closure member can form an effective seal, and which can therefore be used for packaging carbonated beverages.

Abstract: Herein disclosed is a method of orienting the neck of a bottle of a saturated polyester resin so as to enhance the physical properties and durability of the neck. The neck orienting method includes the step of inserting an orienting rod having a taper head into the neck which is being heated. The neck orienting method may include the step of orienting only the mouth edge of the neck.

Abstract: Apparatus and method are disclosed for closing and sealing a molded plastic article formed by expanding a heated plastic parison within a chamber or cavity defined by a plurality of mold sections. The article is closed and sealed by at least one movable sealing member which has a protruding pinch surface to weaken or sever the parison and recess surface portions selectively above or below the protruding pinch surface which provide plastic-receiving reservoirs that aid in the formation of an unobtrusive seal adjacent the surface of the article. The sealing member may also include parison engaging seat or heel portions which further aid in the sealing operation. The temperature of the mold sections adjacent the sealing operation is controlled to selectively retard the cooling of the parison, which is in direct contact with the cavity surface, to maintain the parison at a sufficiently elevated temperature to permit closing and sealing by the sealing member.

Abstract: Disclosure teaches a method for rapid processing parisons, especially a method for maintaining a relatively elevated inside temperature of said parison at the time of its removal from the parison mold characterized by removing the core from the parison while confining it on its outside and while maintaining a positive fluid pressure on the inside of the parison whereby a neck mold may be kept in engagement with the parison.

Abstract: Production of oriented polyethylene terephthalate containers by injecting a polyethylene terephthalate composition into a first mold chamber defining a parison having an axis substantially defined by a core rod and perimeter defined by the wall of the mold; cooling the exterior wall of the polyethylene terephthalate parison to render the outer wall of the parison dimensionally stable; after the outer wall of the parison is dimensionally stable, transferring the parison, while disposed on the core rod, to a second mold chamber having on an average a tolerance of between 2.5 and 150% between the body of the parison and the wall of the second mold chamber; when the core rod is at no more than 265.degree. F.

Abstract: A method and apparatus are disclosed for developing a strain crystallized morphology in blowbottles of thermoplastic material by a heat treatment process subsequent to a blow molding operation. In a first embodiment, the blow mold itself includes means for differentially heating the blown article along its length so that only those portions which have been significantly molecularly oriented are heat treated. In a second embodiment, separate mold-shaped members are mounted adjacent the blow mold to receive the blown articles to apply the desired heat treatment process. In the method, an essentially amorphous thermoplastic parison is expanded in a blow molding operation at a temperature conducive to molecular orientation and strain induced crystallization. Then, the highly molecularly oriented bottle portions are heat treated to develop crystalline growth, while other non-molecularly oriented bottle portions may be simultaneously cooled.

Abstract: Method and apparatus for blow molding plastic articles from preformed parisons by reheating the parisons and then stretching and blowing them. The parisons are conveyed in series to a plurality of fixed heating stations at which the parisons are fixedly positioned for heating, the parisons being rotated for uniform heating. The heating is enhanced by blowing air under pressure through a tunnel enclosing the successive heating stations. Finally, the parison is stretched and blown at a blow station in a blow mold of unique design.

Abstract: Plasticized parisons of synthetic thermoplastic material are formed in an extrusion machine from where they are transferred to a station to be pneumatically converted in the cavity of an open-and-shut premold into hollow blanks which are larger than the parison but smaller than the desired shaped article. During such pneumatic conversion the material of the parison may be subjected to shock-like cooling concomitantly with conversion into the blanks, by appropriate cooling of the premold. The hollow blanks are then transferred to an intermediate station where they are subjected to thermal tempering in two or more separate stages, in order to bring them to an optimum temperature condition for the subsequent biaxial stretching. After tempering, the tempered blanks are transferred to another station to be pneumatically converted into respective shaped articles in the cavity of another open-and-shut mold and under biaxial stretching of their material.

Abstract: One of the main objectives of the present invention is to provide a frosted bottle made of an unsaturated polyester, and another object thereof is to provide a method of making such the frosted bottle.The bottle according to the present invention is made from a cylindrical material prepared by injection moulding and having a bottom wall and a transparent upper portion in the vicinity of the opening thereof. The peripheral outer surface of the cylindrical material is heated to allow the outer surface for becoming milky white, and then put into a mould for blow mounding to inflate the trunk and bottom walls other than the neck portion thereby for forming a bottle. The bottles according to the present invention which are not particularly colored are, therefore, characterized by having walls which are composed of inner transparent portions and opaque outer pheripheral portions of milky white color, when viewed in cross sections. This is a division of application Ser. No. 779,473, filed Mar. 21, 1977.

Abstract: A solar flat plate absorber panel is molded from a laminate consisting of a suitable web material impregnated with a thermosetting phenolic resin. The absorber plate is pressure formed from superimposed layers of material and mold-cured to produce a unitary structure having a first or solar radiation absorbing surface on one side and an integral closed hollow lattice work of fluid heat transfer passages on the other or reverse side of the panel. The laminate web may be made from any suitable material such as paper, cloth, canvas or wire mesh which is easily impregnated with a thermosetting phenolic resin. In the preferred embodiment a B-stage phenol-formaldehyde resin is used. The two superimposed sheets of impregnated material are molded between heated platens of an hydraulic press to form an integral structure and fluid pressure between the sheets is utilized to mold the desired passage shape 5.

Abstract: One of the main objectives of the present invention is to provide a frosted bottle made of a saturated polyester.The bottle according to the present invention is made from a cylindrical material prepared by injection molding and has a bottom wall and a transparent upper portion in the vicinity of the opening thereof. The peripheral outer surface of the cylindrical material is heated to allow the outer surface to become milky white, and is then put into a mold for blow molding to inflate the trunk and bottom walls other than the neck portion thereby for forming a bottle. The bottles according to the present invention are, therefore, characterized by having walls which are composed of inner transparent portions and opaque outer peripheral portions of milky white color, when viewed in cross section.