Abstract: The present invention comprises a method for producing a tube preform using an injection moulding method. The inventor of the present invention has found that in the case of using an injection moulding method to produce tube preforms which can be constructed with either one layer or a plurality of layers, and of subsequent extension, in particular by heating the preform, and biaxial expansion by means of compressed air, a tube can be obtained which, on the one hand, has a tube shoulder with the strength required by industrial thread and, on the other hand, has a lateral surface which exhibits the softness desired for a tube.

Abstract: This invention relates to articles made of polyester, preferably polyethylene terephthalate (PET), having coated directly to at least one of the surfaces thereof one or more layers of thermoplastic material with good gas-barrier characteristics, and novel methods of making such articles. Preferably the barrier-coated articles take the form of preforms coated by at least one layer of barrier material and the containers blow-molded therefrom. Such barrier-coated containers are preferably of the type to hold beverages such as soft drinks, beer or juice. The preferred barrier materials have a lower permeability to oxygen and carbon dioxide than PET as well as key physical properties similar to PET. The materials and methods provide that the barrier layers have good adherence to PET, even during and after the blow molding process to form containers from preforms. Preferred barrier coating materials include poly(hydroxyamino ethers).

Abstract: The present invention provides a method of making laminated bottles each having an outer layer and an inner layer capable of delaminating from the former layer. The method consists of the step of injection molding an outer preform from a molten first resin, and the next step of injection molding an inner preform inside the outer preform, using a molten second resin. The method further has the final step of blow molding a parison composed of the outer and inner preforms so as to form each laminated bottle. The second resin has a melting point lower than that of the first resin, nevertheless and contrarily to the prior art, precise parisons affording satisfactory lamination can now be prepared by the injection molding steps. In addition, ventilation holes are formed in the outer layer readily and surely without damaging the inner layer.

Abstract: The present invention provides processes and an apparatus for injection-molding an article with a fluid channel formed therein. The process includes providing at least first and second resin streams within a mold cavity, causing the flow fronts (16) of the resin streams to meet at a longitudinal point in the mold cavity to form a first layer of solidified resin on a peripheral surface of the mold, the first layer having a knit line (20) at the longitudinal point where the resin streams meet; and introducing a fluid into the molten resin in the mold to form a fluid channel (50) and a second layer (32) of solidified resin, the second layer between the fluid channel and the first layer of solidified resin, wherein the second layer is devoid of a knit line at the longitudinal point in the mold cavity where the first and second flow fronts meet.

Abstract: A method of forming multi-walled plastic containers in a single blow mold. In general, the method comprises disposing at least two separate parisons simultaneously into a blow mold and forming them to shape one after another by means of a special blow mandrel or pin. A substantially hollow, cylindrical first parison may be disposed around or outside of a substantially balloon or tube shaped second parison in an initially open blow mold. After closing the blow mold, the first or outer parison is expanded outwardly so that its outer surface engages the inner surface of the blow mold to assume the shape thereof, and thereafter, the second or inner parison is blown or outwardly expanded to an extent such that its outer surface at least partially engages the inner surface of the first or outer parison. The outer and inner parisons may be formed of different materials which may desirably impart different properties such as mechanical stability and resistance to permeation of fuel vapor from the container.

Abstract: Multilayer blow molded containers, which comprise a layer of an ethylene-vinyl alcohol copolymer (A) having an ethylene content of 5 to 60% by mol and a degree of saponification of 85% or more and a layer of a resin composition (B), characterized in that the resin composition (B) comprises 1 to 40% by weight of a thermoplastic resin (b1) having at least one functional group selected from the group consisting of boron-containing groups that are convertible to a boronic acid group in the presence of water and a boronic acid group (hereinafter, referred to as a boron-containing functional group), and 60 to 99% by weight of polypropylene (b2), exhibit excellent gas-barrier properties, have good interlayer adhesion, have excellent thermal stability, and are low in production cost.

Abstract: A preform for forming a hollow blow molded plastic container is provided with a closed base, a multilayer body-forming portion extending from the base, and an open neck portion that extends from the body portion. The body portion includes a co-extruded inner liner that includes (a) an innermost polymer layer, (b) at least one oxygen-scavenging layer, and (c) at least one high-oxygen barrier layer for retarding the migration of gases and moisture therethrough. An outermost layer is molded over the inner liner to form a preform. The liner and preform are formed so that the wall thickness of the individual layers can easily be varied along their lengths, however, at any given point along the length of the co-extruded liner (a) the wall thickness of the innermost polymer layer is less than 0.50 of the wall thickness of the inner liner and (b) the wall thickness of the inner liner is less than 0.25 of the total wall thickness of the preform body portion.

Abstract: A multilayer plastic container having enhanced strength for high temperature and pressure applications such as the pasteurization of carbonated juice drinks. The container is commercially cost-effective in comparison to prior art pasteurizable glass containers, and provides all of the advantages of plastic over glass, i.e., lightweight, shatter-resistant, etc. In a particular embodiment, the multilayer container includes inner and outer layers of a relatively high IV virgin PET, e.g., 0.85-0.90 dl/g, and a core layer of post-consumer PET having a substantially lower IV. The container has a relatively tall and slender profile, with high orientation levels in the panel and shoulder, and an oriented thick-walled base with feet. The base preferably has a high profile and angled foot pads which are allowed to move outwardly under creep.

Abstract: A process for injection molding a composite of rigid thermoplastic and soft thermoplastic, the soft thermoplastic including a cavity established with pressurized assist gas or an assist liquid. The process includes the steps of: injecting a hard molten thermoplastic into a first mold chamber; injecting a soft molten thermoplastic into a second mold chamber; establishing communication between the first chamber and the second chamber so that the rigid thermoplastic and soft thermoplastic integrally bond; and injecting an assist fluid into the soft thermoplastic to form a cavity. In a preferred embodiment, the formed composite is an automotive cowl where the rigid thermoplastic forms the rigid body portion of the cowl and the integrally bonded soft thermoplastic forms a compressible bulb seal.

Abstract: A method is provided for manufacturing a painted plastic component having a badge, emblem or other ornamentation, such as air bag covers having a badge, or wherein the component is the badge itself. The method includes providing a painted film sheet and a one-piece thermoplastic elastomeric structural carrier. A bottom contact surface of the film sheet bonds with a front contact surface of the structural carrier by diffusion between the contact surfaces thereof within a mold cavity of an injection mold separate from the mold cavity of a vacuum mold which is utilized to vacuum-mold the film sheet to form the desired painted plastic component.

Abstract: A preform and container each having a crystallized neck finish and method of making the same, wherein the method involves introducing a first thermoplastic material into a first mold section to form a substantially crystallized neck portion of a preform, and introducing a second thermoplastic material into a second mold section to form a substantially amorphous body-forming portion of a preform. The first material may have a substantially higher crystallization rate than the second material, and/or the first mold section may be at a higher temperature than the second mold section. In one embodiment, an indexer carrying two core sets is movable between first and second cavity sets for sequentially molding the neck portions on the first core set in the first cavity set, and then transferring the cores and neck portions to the second cavity set for molding the body-forming portions.

Abstract: A process for the production of polyamides is disclosed. In a first reaction step, suitable monomers such as caprolactam or an aliphatic aminocarboxylic acid are reacted with polyfunctional amines, which contain at least one secondary amino group, and/or with salts containing such amines and dicarboxylic acids. The reaction product is in a further process step undergoes solid phase post-condensation.

Abstract: A multi-layer preform, includes: (a) a plastic inner liner, comprised of a cylindrical walled body, which may or may not include a tapered annular shoulder portion, and a cylindrical walled neck portion extending upwardly from the body, and (b) a molded outer layer. Prior to the outer layer being molded over the plastic inner liner, at least a portion of the liner is crystallized by a heat treatment process. The molded outer layer may include a means to receive a closure device. When the preform is at an acceptable temperature range for orientation, the multi-layer preform can be blow-molded to form a multi-layer container having improved properties.

Abstract: Thermoplastic multilayer composite, particularly in the form of a multilayer hose, a multilayer pipe or a multilayer container, containing at least one intermediate layer made of a molding compound on the basis of ethylene/vinyl alcohol copolymers between layers made of molding compounds on the basis of polyamide, the intermediate layer being bonded via at least one adhesion-promoting layer made of a molding compound on the basis of polyamide selected from the group of copolyamide 6/12, block copolyamide 6/12, polyamide 612, polyamide 610, a mixture of polyamide 6 and polyamide 12 with compatibilizer, a mixture of polyamide 6 and polyamide 11 with compatibilizer, with at least one neighboring layer made of a molding compound on the basis of polyamide 12, polyamide 11, polyamide 1010, polyamide 1012, or polyamide 1212.

Abstract: A manufacturing method of the copolyester containing 2,6-ethylene naphthalate unit (EN) by using 2,6-naphthalenedicarboxylic acid (NDA), purified terephthalic acid (PTA), and ethylene glycol (EG) to proceed with esterification or by using dimethyl 2,6-naphthalenedicarboxylate (NDC), dimethyl terephthalate (DMT), EG, and transesterification catalyst to proceed with transesterification reaction or by PTA process. While the esterification reaction reaches 85˜98 percent of esterification ratio, NDC, EG, and transesterification catalyst are added to proceed with transesterification reaction. The monomer obtained from previous procedure is added with polymerization catalyst thereafter to proceed with polycondensation reaction to produce copolyester of which the viscosity is increased through solid state polymerization. Then, the copolyester is ejected to be blow-molded so as to produce the one-way bottle which can meet the requirement of pasteurization.

Abstract: A multilayer plastic container having enhanced strength for high temperature and pressure applications such as the pasteurization of carbonated juice drinks. The container is commercially cost-effective in comparison to prior art pasteurizable glass containers, and provides all of the advantages of plastic over glass, i.e., lightweight, shatter-resistant, etc. In a particular embodiment, the multilayer container includes inner and outer layers of a relatively high IV virgin PET, e.g., 0.85-0.90 dl/g, and a core layer of post-consumer PET having a substantially lower IV. The container has a relatively tall and slender profile, with high orientation levels in the panel and shoulder, and an oriented thick-walled base with feet. The base preferably has a high profile and angled foot pads which are allowed to move outwardly under creep.

Abstract: A multi-layered plastic pipe particularly suitable for use as an intake manifold of an internal combustion engine is provided. The present pipe includes a hollow plastic core, at least one spacer member provided on the hollow plastic core and an outer layer integrally provided on the outer peripheral surface of the hollow plastic core excepting the spacer member. The spacer member is preferably formed from a plastic material, and the outer layer is also formed from a plastic material. There is also provided a method for manufacturing a multi-layered plastic pipe using a spacer member to prevent a hollow plastic core placed in a mold cavity from being deformed when a molted plastic material is supplied into the mold cavity under pressure.

Abstract: A multilayer injection nozzle assembly, for use with an injection molding machine, to form a multilayer injection molded article comprising an inner nozzle, a middle nozzle and an outer nozzle. The inner nozzle has a first hole which communicates with a first channel in the inner nozzle and for receiving a flow of a first material from the injection molding machine. The inner nozzle also has a second hole which communicates with a second channel in the inner nozzle for receiving a flow of a second material from the injection molding machine. The first channel communicates with an inner and an outer channel in the inner nozzle, whereby the first material flows from the first channel into both the inner channel and the outer channel.

Abstract: Disclosed are plastic preforms and bottles, preferably comprising polyethylene terephthalate (PET), in which the materials in the neck, neck finish and/or neck cylinder is at least partially in the crystalline state and the body is primarily in the amorphous or semi-crystalline state. This structure in a preform enables the preform to be easily blow molded by virtue of the amorphous material in the body, while being able to have dimensional stability in hot-fill applications. In addition, the amorphous inner surface of the neck finish stabilizes the post mold dimensions allowing closer molding tolerances than other crystallizing processes. On the other side, the crystallized outer surface supports the amorphous structure during high temperature filling of the container. Physical properties are also enhanced as a result of this unique crystalline/amorphous structure.

Abstract: A method for medical balloon fabrication comprising the steps of securing a balloon with a mold by inflating it and then enlarging the inner diameter of the balloon. The devices of the invention comprise a fixture with a mold configured to hold the inflated balloon and a drill that can be centered with the mold to enlarge the inner diameter of the balloon.

Abstract: A mold for producing a hollow thermoplastic resin molded article includes a set of female and male mold members and a gas passage provided in at least one of the mold members which opens directly onto a surface of the mold member. Alternatively, a gas introducing member for introducing gas into a cavity may be provided in communication with the gas passage such that the tip of the gas introducing member does not protrude into the cavity of the mold. A lagging material, such as an insulating material or a local heater is preferably provided in the area of the mold adjacent the gas passage or gas introducing member. A method of producing a thermoplastic resin molded article using a mold of this nature is also disclosed.

Abstract: A molding method and a metal-covered plastic component such as partial or entire fascia, body side moldings, and the like, which have bright surface requirements and which includes a film sheet and a one-piece thermoplastic elastomeric structural carrier are provided. The film sheet includes a decorative layer of metal such as chrome. A plastic layer of the film sheet on which the layer of metal is formed is selected from a group consisting of polyester, polyurethane and polycarbonate. A bottom contact surface of the film sheet bonds with a front contact surface of the structural carrier by diffusion between the contact surfaces thereof within a mold cavity of an injection mold separate from the step of forming a preform which is securely positioned within the injection mold during injection molding to form the plastic part.

Abstract: This invention relates to articles made of polyester, preferably polyethylene terephthalate (PET), having coated directly to at least one of the surfaces thereof one or more layers of thermoplastic material with good gas-barrier characteristics, and novel methods of making such articles. Preferably the barrier-coated articles take the form of preforms coated by at least one layer of barrier material and the containers blow-molded therefrom. Such barrier-coated containers are preferably of the type to hold beverages such as soft drinks, beer or juice. The preferred barrier materials have a lower permeability to oxygen and carbon dioxide than PET as well as key physical properties similar to PET. The materials and methods provide that the barrier layers have good adherence to PET, even during and after the blow molding process to form containers from preforms. Preferred barrier coating materials include poly(hydroxyamino ethers).

Abstract: A preform or parison for manufacturing a container having a large interior diameter body and small interior diameter opening is prepared by molding the preform in two parts, a body having a generally cylindrical sidewall with one open end and one closed end, and a preform end having a diameter sized to mate with the sidewall and an opening therein for accessing the interior of the preform, and then joining the preform body and preform end to form a complete preform having an internal diameter larger than the diameter of the opening. The preform so formed is then used in a conventional blow molding process to produce a container having a large internal diameter and a narrow access opening.

Abstract: A method of manufacturing a multi-layered plastic manifold (10) including molding an outer layer (22) of the manifold (10) about a blow molded core insert (20). The outer layer (22) is molded by either a thermoplastic injection molding process or a urethane casting process. While the outer layer (22) is being molded, the pressure and temperature within the core insert (20) are controlled to preserve the structural integrity of the core insert (20).

Abstract: A hybrid injection molding machine that has the capability to draw a decorative or fabric sheet into a mold cavity prior to injection into the mold has opposing male and female mold parts. At least one of the mold parts has an insert formed from a porous metal so that a vacuum may be drawn through the insert in order to draw the fabric sheet into all aspects of the insert cavity so that plastic may then be injection molded into the cavity of the mold.

Abstract: In a method of plastic injection molding of plastic parts with a critical external dimensional accuracy, in particular plastic gears, the plastic molding material is first injected into the mold, and then gas is injected under pressure into the mold to reduce shrinkage of the plastic material away from the mold surface, forming a gas bubble in the plastic molding material in the mold. Then after cooling of that first injected plastic, a separate, secondary injection of more of the same plastic material under pressure into the gas bubble, in the mold (before removing the plastic part from the mold), provides increased strength and a uniform rotational moment of inertia of the gear.

Abstract: A polyethylene terephthalate multi-layer preform (26) and a method for making the preform provides an inner layer (28) of virgin polyethylene terephthalate and an injection molded outer layer (30) of post consumer recycled polyethylene terephthalate which by weight is at least 75% of the total weight of the preform. The inner layer (28) of virgin polyethylene terephthalate is thermoformed prior to the injection molding of the outer layer (30) of post consumer recycled polyethylene terephthalate. A relatively large amount of the post consumer recycled polyethylene terephthalate can be utilized due to the thermoforming and injection molding as disclosed. More specifically, the post consumer recycled polyethylene terephthalate preferably by weight is 85%, most preferably in the range of 88 to 92% and optimally about 90% of the total weight of the preform.

Abstract: Flexible belts, and electrophotographic machines that use such flexible belts, that having embedded sensor fibers that run across the belt's width. Such sensor fibers enable sensors located along the side of the belt to sense belt position and/or motion.

Abstract: A decorative sheet formed by coating a surface of an acrylic resin sheet having a coefficient of kinetic friction with respect to a flat glass plate in the range of 0.2 to 0.9 and a glass transition temperature of 80° C. or below with a pattern layer is inserted in a female mold and a male mold of an injection mold, the decorative sheet is clamped to the female mold, the female and the male mold are joined together to form a cavity in the injection mold, a fluid resin is injected into the cavity so as to fill up the cavity, the resin filling up the cavity is solidified in a sheet-decorated molding having a surface coated with the decorative sheet, the injection mold is opened and the sheet-decorated molding is ejected from the female mold.

Abstract: A shaft assembly including an elongated member having at least a portion which is hollow having an inside surface defining a shaft core is provided. The shaft assembly includes a rotatable, torque transmitting elongated member defining a portion thereof which is hollow having an inside surface and defining a shaft core. The shaft has an outside surface including a torque transmitting portion and a functional feature portion. The elongated member defines an aperture gate extending from the inside surface to the outside surface. The elongated member also defines a hardened, moldable material. The material extends from the inside surface through the aperture gate. The material is secured to at least a portion of the outside surface.

Abstract: The invention relates to a laminated packaging material comprising a core layer of paper or paperboard and a gas barrier layer of a polyarmide blend including a condensation polymer of metaxylene diamine and adipic acid (Nylon-MXD6) and a second crystalline or semicrystalline polyamide, applied on one side of the core layer by means of co-extrusion coating. The invention also relates to a method of producing the laminated packaging material and to a packaging container which is produced from the laminated packaging material.

Abstract: A method for forming a hollow bottom of an acrylic cup by forming a cup body by injecting a molding with a liquid transparent or semi-transparent acrylic material into a mold to form a mushroom shaped cavity. The cavity in the bottom of the cup body is filled with a gas, permitting the whole cup to appear to have a three dimensional (3D) visual effect. The cavity of the bottom of the cup can be filled with a non-colored or colored liquid to permit the whole cup to contain a deflected visual effect of a plurality of colored layers.

Abstract: Method and apparatus for making multilayer injection molded plastic articles. In one embodiment, a relatively thin inner sleeve layer is molded in a first mold cavity on a core, the first mold cavity being heated to maintain an outer surface of the inner sleeve layer at an elevated temperature, and the core and sleeve layer are transferred to a second mold cavity to mold a relatively thick outer layer over the sleeve layer while the outer surface is at the elevated temperature, where the elevated temperature is selected to provide melt adhesion between the inner sleeve and the outer layer during the second molding step. In another embodiment, a method of injection molding is provided in which a first thermoplastic material is used to form a first preform portion having an average percent crystallinity of at least about 30%, and a second thermoplastic material is injection molded to form a second preform portion which remains substantially amorphous.

Abstract: A method is provided for manufacturing a painted plastic component such as painted air bag covers, side cladding or exterior bumpers, which includes a painted film sheet and a one-piece thermoplastic elastomeric structural carrier. A bottom contact surface of the film sheet bonds with a front contact surface of the structural carrier by diffusion between the contact surfaces thereof within a mold cavity of an injection mold separate from the mold cavity of a vacuum mold which is utilized to vacuum-mold the film sheet to form the desired painted plastic component.

Abstract: The multilayer plastic container comprises a neck portion, a body portion, adjacent the neck portion, forming a cylindrical wall, and a bottom portion adjacent the body portion and opposite the neck portion. The cylindrical wall comprises a first layer of PET, a layer of EVOH adjacent the first layer of PET and a second layer of PET adjacent the layer of EVOH. The EVOH has an average thickness which is greater near the neck portion of the container than near the bottom portion of the container.

Abstract: Oxygen scavenging barrier polyamide compositions exhibiting high oxygen scavenging capability as well as good coinjection stretch blow moldability characteristics suitable for making multilayer PET bottles with good clarity and delamination resistance are claimed in this invention. The polyamide compositions of this invention comprise a slow crystallizing polyamide blend comprising (i) an amorphous, semiaromatic polyamide homopolymer, copolymer or mixture thereof and (ii) a semicrystalline, aliphatic polyamide homopolymer, copolymer or mixture thereof wherein in the weight ratio of (i):(ii) ranges from about 99:1 to about 30:70; at least one polyamide-compatible, oxidizable polydiene; and at least one oxidation promoting metal salt catalyst. The multilayer PET bottles, made with the polyamide compositions of this invention as the barrier layer, are suitable for extended shelf-life packaging of oxygen-sensitive food and beverage products such as beer and juices.

Abstract: A foil-covered automotive interior plastic part including a decorative preform is provided including a hot stamping foil having a foil top layer disposed on a plastic bottom layer which, in turn, is bonded to a outer surface of a plastic structural substrate at foil-receiving portions of the outer surface. A hot stamping machine is operated for a time sufficient to generate a pressure and temperature sufficient to melt and combine the top surface of the foil-receiving portions and the plastic bottom layer of the hot stamping foil to form the foil-covered plastic part. The at least one foil-receiving portion includes a plurality of raised design portions having top and side surfaces. The foil layer completely covers the top surfaces but only the side surfaces of the raised design portions which extend above a front surface of the preform. Preferably, the raised design portions represent screw heads.

Abstract: An automotive air bag cover is provided having a decorative applique preform bonded thereto completely about a pair of flap portions of a front panel of the cover. The air bag cover is manufactured from plastic and the front panel is adapted to enclose an uninflated automotive air bag. The front panel includes inner and outer surfaces. Side panels are further provided and are connected to and extend rearwardly from the front panel. The decorative applique preform is bonded to the entire outer surface of the front panel except for the flap portions. Seams are provided for permitting the air bag to inflate and exit the front panel. The decorative applique preform is bonded to the front panel adjacent the seams in a non-overlapping fashion such that the decorative applique preform does not interfere with exit or inflation of the air bag.

Abstract: A method is provided for manufacturing a painted plastic component having a badge, emblem or other ornamentation, such as air bag covers having a badge, or wherein the component is the badge itself. The method includes providing a painted film sheet and a one-piece thermoplastic elastomeric structural carrier. A bottom contact surface of the film sheet bonds with a front contact surface of the structural carrier by diffusion between the contact surfaces thereof within a mold cavity of an injection mold separate from the mold cavity of a vacuum mold which is utilized to vacuum-mold the film sheet to form the desired painted plastic component.

Abstract: A container comprises a wall comprising at least one layer, the wall comprising a polypropylene having a high flexural modulus and a polyethylene chosen from low-density and very low-density polyethylenes. The container can further comprise a product in the container. The product is chosen from cosmetic products, food products, household products, and industrial chemistry products. A method of making the container includes extruding a parison having at least one layer, the parison including a polypropylene having a high flexural modulus and a polyethylene chosen from low-density and very low-density polyethylenes, and blowing the parison in a mold having at least one cavity with a geometry corresponding to that of the container to obtain the container.

Abstract: A dual-chamber container is formed in an injection blow molding process. Two preforms are injection molded around respective core rods. The preforms and core rods are then moved to a blow mold, in which the preforms are molded to the confines of the mold. The blow mold has partial walls between the two cavities, which provide directional control over the preforms as the preform wall portions are blown against and contact welded to each other. The outer walls of the preforms, which must travel and stretch a greater amount than the inner walls, are formed thicker in the preform molding operation.

Abstract: The present invention provides a p-hydroxybenzoic ester represented by the formula (1) wherein R1 represents a C6-C10 straight-chain or branched-chain alkyl group, A1 represents a C2-C4 alkylene group and n in an integer of 1 to 8, a plasticizer for at least one polyamide resin selected from nylon 11 and nylon 12 which comprises the ester, a polyamide resin composition comprising the ester and at least one polyamide resin selected from nylon 11 and nylon 12, and a polyamide resin molded article comprising the ester and having excellent high-temperature volatilization resistance and low-temperature impact resistance.

Abstract: A sheet-decorating injection molding machine is provided with a female mold, a male mold, a sheet clamper for fixedly holding a decorative sheet on a parting surface of the female mold, and a hot plate having a first heating plate and a second heating plate jointed at corresponding edges thereof in a V-shape. The heating surfaces of the first and second heating plates face the female mold. The V-shaped hot plate is moved to a position near the decorative sheet held by the sheet clamper on the female mold to heat the decorative sheet uniformly.

Abstract: The invention relates to a method for using spinel pigments to increase the infrared heat-up rates of thermoplastic resins and specifically polyester bottle resins. In particular, the method comprises adding spinel pigments to polymerized resins to increase the reheat rates of the resulting polyester pre-forms. When uniformly distributed, these spinel pigments absorb applied energy and thereupon transfer the energy to the polyester.

Abstract: A multi-layer preform, includes: (a) a plastic inner liner, comprised of a cylindrical walled body, which may or may not include a tapered annular shoulder portion, and a cylindrical walled neck portion extending upwardly from the body, and (b) a molded outer layer. Prior to the outer layer being molded over the plastic inner liner, at least a portion of the liner is crystallized by a heat treatment process. The molded outer layer may include a means to receive a closure device. When the preform is at an acceptable temperature range for orientation, the multi-layer preform can be blow-molded to form a multi-layer container having improved properties.

Abstract: There are disclosed:

Abstract: An injection-molding apparatus comprises;

Abstract: A method of injection molding an over-molded article in which a cavity extension associated with a core is first moved to a disengaged position and the core is inserted into a first cavity having a defined volume in a first geometrical configuration. A first injection operation is performed into the first cavity to form a first layer of the article. The core is then removed from the first cavity with the first layer of the article on the core. The cavity extension is moved to an engagement position and the core and first layer are inserted into a second cavity. The second cavity and the cavity extension engage to form a composite cavity having a larger volume than the defined volume and define a second geometrical configuration. A second injection operation is performed into the composite cavity to over-mold the first layer to form the article. The core and cavity extension are separated from the second cavity to remove the article therefrom.

Abstract: A multi-layer plastic preform 14 with an inner layer 28 that is extrusion blow molded from a resin having an intrinsic viscosity greater than 0.90, and an outer layer 44 that is injection molded around the inner layer from a resin having an intrinsic viscosity that is at least 0.10 less than the intrinsic viscosity of the inner layer. The inner layer 28 is no greater than 20% (preferably no greater than 15%) by weight of the total weight of the preform and the outer layer 44 is at least 80% (preferably at least 85%) by weight of the total weight of the preform.