Abstract: An apparatus for the manufacturing of plastic pipes has an injection head and half shells of which two at a time combine as a pair to form a mold. The injection head has at least one channel issuing in a substantially ring-shaped nozzle, which is delimited by two components one of which being adjustable for modification of the width of the nozzle. A component directly delimiting the nozzle is tiltable in relation to the central longitudinal axis, whereby an adjustment of the width with great sensitivity is attained for such a ring-shaped nozzle.

Abstract: A method for manufacturing an automobile trim component includes the step of coextruding a plastic unfoamed material and foamed material into a multilayer parison, which is thereafter blow molded to a desired form. After the layers are cured, the article is removed from the blow mold and sectioned into multilayer skin halves, and one skin is placed in an injection mold. The core resin, either thermoplastic or thermoset in nature, is then injected into the injection mold and onto the skin, and then compresses the resin against the skin to produce a shell comprising a resin core layer, intermediate foam layer, and decorative outer layer.

Abstract: For the continuous manufacture of a compound pipe with a pipe socket including a smooth internal tube and an external tube provided with transverse grooves and welded together with the latter, an external tube and an internal tube are extruded, the latter into the external tube. While the normal compound pipe is manufactured, gas is blown at a slight overpressure into the space beteen the external tube and the internal tube. When the pipe socket is produced, this space is vented so that a full-surface bearing of the internal tube against the external tube is achieved, to which end the internal tube is acted upon from its inside by gas under pressure.

Abstract: An inflatable medical dilation balloon and methods for forming the same wherein the balloon member is comprised of a polymer bled including a predominant amount of a crystalline polymer, e.g. a polyester, and a compliance enhancing additive polymer, e.g. a polyolefin, in amount sufficient to interrupt the crystalline structure of the crystalline polymer. The amount is about 20% or less of the polymer blend. The balloon member formed of the polymer blend is inflatable for medical dilation, e.g. of the prostrate.

Abstract: The invention concerns a cooling plug for sizing the interior surface of thermoplastic extruded pipe. Vacuum and/or pneumatic pressure is applied at the surface of the plug. The pneumatic pressure may cause the inner wall to balloon outwardly to form bells within a mold or within an outer wall, to fit into corrugations of an outer corrugated tube, etc. The vacuum may be used to pull the inner wall back to the surface of the plug after application of pneumatic pressure.

Abstract: A method for forming a large thickness flange at an end of a blow molding tube by injection molding using a die assembly. The blow molding tube is sufficiently cooled down before insertion into injection molding dies. The sizes and dimensions of tube holding portions of the injection molding die assembly, which hold the blow molding tube at a portion adjacent to the end, and those of a mating injection molding mandrel are set in conformity to its size and dimension of the blow molding tube after thermal shrinkage thereof caused by cooling of the tube. Thus, any gap between the blow molding tube and injection molding die assembly is eliminated, so that any leakage of molten resin through such a gap between the contact surfaces of the blow molding tube and those of the injection molding dies and mandrel can be perfectly prevented during the injection molding step. For instance, the method is useful for producing an intake manifold used in an automotive engine room.

Abstract: A plastic system for extruding injection molding and extruding a hollow tube from plastic containing heat sensitive material for thereafter forming into a plastic container by blowing including an extruder for melting the plastic and delivering it to an injection system for injecting the plastic into a manifold that delivers the plastic to the tubular cavities of an injection head including providing a static mixer adjacent each of the cavities. By such an arrangement, the plastic flow in each flow channel provides a uniform homogeneous plastic material such that streaks which may be caused by degraded plastic material or by different color material from a previous run are eliminated.

Abstract: A method of controlling the extrusion of a multilayer parison so that the injection pressure for an auxiliary resin and that for an adhesive do not act on the annular fluid passages while a main resin, an auxiliary resin and an adhesive are stored in a main resin accumulator, an auxiliary resin accumulator and adhesive accumulators, respectively. The injecting pressure difference between each pair of auxiliary resins and the adhesive is maintained within a prescribed range and the injection of the resins and the adhesive from the accumulators is terminated simultaneously for all the materials.

Abstract: Blow molding and thermoforming processes in which a mold system having low thermal inertia mold-halves provided with heating and cooling systems is utilized for producing plastic articles coated with surface-upgrading films of high melting polymers or polymers exhibiting a high scratch resistance to improve mechanical characteristics of the molded article. The films may be positioned, before the mold is closed, close to the low thermal inertia mold-halves. Rapid heating and rapid cooling of the mold-halves in contact with the surface-upgraded films permit strength adhesion of the upgrading material to the surface of the molded article.

Abstract: A process for preparing structural, heat-insulating shaped bodies which does not necessarily require the use of a foamed heat-insulating material obtained by the use of blowing agents belonging to the class of chlorofluorocarbons. The process includes inserting a heat-insulating pre-molded core inside a tubular element made from an extruded thermoplastic polymer; placing the extruded tubular element containing the pre-molded core into a blow-molding mold; and molding the tubular element into a shell by blow-molding. By subsequent mold closure, the shell adheres to the pre-molded core. An alternative process is disclosed for adhering the tubular element and pre-formed core by closing the mold and drawing a vacuum within the tubular element.

Abstract: A method for producing a plastic product including an axially extending portion, such as a duct or pipe, and a radially extending portion, such as a flange or bracket. A parison is placed in a first mold cavity defined in a mold and blow molded to form the axially extending portion, and then a movable mold segment is moved to a retracted position to define a second mold cavity adjacent to a part of an outer peripheral surface of the axially extending portion thus formed. Then, a second molted plastic material is supplied into the second mold cavity and the movable mold segment is again moved to another predetermined position to pressurize the second plastic material to thereby form a radially extending portion. The resulting hollow plastic product is extremely high in structural integrity between the axially and radially extending portions.

Abstract: A molding including a hollow molding body, and an ornamental film layer adhered on the upper surface and the side surfaces of the hollow molding body. The manufacturing process of the molding substantially comprises the steps of forming the hollow molding body by a blow molding method, and adhering the ornamental film layer on the hollow molding body. The adhesion of the ornamental film layer is achieved during formation of the hollow molding body.

Abstract: A fiber reinforced structure having a hollow blow-molded core and a method for manufacturing the same. Bulk fibrous material is dispensed between two die pieces of a mold. A blow-moldable plastic parison is extruded within the fibrous material. The mold is closed, pinching the parison closed and detaching the bulk fibrous material from the structure. The parison is inflated thus forcing the fibrous material against the interior mold walls. Liquid resin is injected into mold and impregnates the fibrous material. After curing, the finished reinforced structure is removed from the mold.

Abstract: A method of manufacturing a multi-layer hollow article which consists of extruding a multi-layer parison having at least a chief resin layer, a sub resin (barrier) layer, and an adhesive resin layer located between the chief resin layer and the sub resin layer. The adhesive resin layer is made of the same essential material as the chief resin material and of the same quality. The sub resin layer is cut off by the use of a raised extrusion pressure of the adhesive resin when the multi-layer parison has been extruded a predetermined length. The parison is received in a mold so that the cut off sub resin (barrier) layer lies within the mold below pinch offs. Flash is produced as a result of the molding. The flash consists of the chief resin material or the chief resin material and the adhesive resin material. The flash is recycled as part of the chief resin material. Collecting a flash of a hollow article made by a blow molding and rebirthing the flash a rebirth chief resin material.

Abstract: Improved resin compositions for use in multiple cavity stretch blow molding processes comprising: (a) a propyleneethylene copolymer resin including from about 5% to about 15% of a second stage polymer characterized by a cycle time of T.sub.1, when used to produce containers in multiple cavity stretch blow molding processes; (b) from about 0.1% to about 1.0% of a nucleating agent prepared by irradiating in air a mixture of a propylene homo or copolymer and about 500 to about 3000 ppm of antioxidant with a sufficient amount of ionizing radiation to cause said nucleating agent to have a xylene insoluble content of at least 30%. The improved resin composition is characterized by a cycle time of T.sub.2 when used to produce containers in multiple cavity stretch blow molding processes such that the ratio of T.sub.2 /T.sub.1 is less than 0.95.

Abstract: An insulated panel for a domestic or household appliance is formed by a process in which two sheets of plastic material are extruded from a co-extrusion die and moved directly into a die thermoforming fixture. When the open die members are closed, the edges of the two sheets are sealed together to form a hollow panel and the walls of the panel are forced outwardly to conform to the shape of the die members. After the hollow panel is trimmed it is moved to a foam machine preferably while still contained in the thermoforming fixture so that foam insulation is inserted into the hollow panel while the walls of the panel are supported by the die members so that these walls are not deformed while the foam insulation is added.

Abstract: The vessel portion of a gas-tight container suitable for packaging fresh foods is produced as a composite of paperboard and polymer film. A pair of folded paperboard blanks, pre-cut and pre-formed, are inserted into the opposite halves of split mold elements to a blow molding machine. Vacuum orifices in each mold half unit temporarily secure the position of a respective paperboard blank. The paperboard lined mold halves are closed upon a hot, extruded parison of malleable polymer leaving an end portion of the parison tube projecting from the closed mold unit. A fluid conducting needle penetrates this projected end portion to inflate the parison with an apppropriate blowing gas. Such inflation expands the malleable polymer, seamlessly and creaselessly, into the internal corners and crevices of the folded paperboard blanks. Following chilling, the mold unit is opened and the pair of paperboard blanks are ejected as a singular unit, joined by a molded flange of the continuous polymer film.

Abstract: In a process and apparatus for the discontinuous production of preforms for producing hollow bodies from thermoplastic material, the wall of which is a laminate having at least first and second layers, by extrusion blow molding, the flow of material for forming the laminate is guided within the extrusion head which serves to produce the preforms, by suitable dimensioning of the volume of the duct system accommodating the laminate, such that regions of disturbed laminate occur in the end portions of the preform which are squeezed off the extruded preform by the blow molding mold as a waste portion.

Abstract: In a process and apparatus for the production of hollow bodies from thermoplastic material, having a wall of a laminate formed by at least first and second layers, by means of extrusion blow molding, a preform having a wall structure with a suitable number of layers is first produced in a batch-wise procedure using an extrusion head. The material required to produce the preform is guided in the extrusion head in such a way that disturbed portions of the laminate pass into the waste flash portions at the ends of the hollow body produced from the preform, so that the wall of the finished hollow body is devoid of disturbed laminate portions of that kind.

Abstract: A method for making a multiple compartment container by providing a mold for defining an outside contour surface of the container; providing a partition member; locating the partition member within the mold; the mold making localized contact only with the partition member for uniformly spacing an edge profile of the partition member from the outside contour surface between adjacent compartment regions of the mold; feeding a plastic material simultaneously into each of the compartment regions of the mold; and forming the plastic material against the outside contour surface of the mold and against opposite sides of the partition member, the plastic material totally enclosing the partition except to the extent of the localized contact with the mold, the partition member being retained between adjacent compartments of the solidified container following removal from the mold.

Abstract: An extruder for extruding a multilayer parison and a method for doing the same. The extruder includes a cylinder having a cylindrical hole and a die slit which extrudes a parison, a ring piston movably fitted in the cylindrical hole, a multilayer head provided between the die slit and the ring piston, and a plurality of annular nozzles concentrically provided in the multilayer head, the annular nozzles facing and being opened to the side of the die slit.

Abstract: A process which includes providing a preform including a polymeric material formed to permit the introduction of a fluid under pressure into the preform, heating the preform to a temperature at or above the glass transition temperature of the polymeric material and below the melting temperature of the polymeric material, placing the heated preform into a substantially cylinderical mold with a polished seamless inside surface, introducing a fluid under pressure into the heated preform while maintaining the preform axially centered in the mold, thereby causing the preform to expand without contacting the mold surface, subsequently causing the preform to expand until it contacts the mold surface, heating the expanded preform to an appropriate heat setting temperature above the stretching temperature and below the melting temperature of the polymeric material while maintaining fluid pressure, and subsequently cooling the set preform, resulting in formation of a biaxially oriented seamless belt.

Abstract: A method and apparatus for constructing an above ground concrete encased storage tank. The apparatus has a support assembly that extends from the baseplate of a concrete form, that supports, elevates, and secures an inner storage tank from the form baseplate, so that the tank may be completely surrounded by concrete. The form has removable walls that may be pivotally attached to the baseplate and initially in a horizontal position. The support assembly has anchor bolts that extend through holes in the baseplate. The anchor bolts are screwed into anchor nuts that are attached to a pair of brackets. The anchor nuts and brackets are spaced from the baseplate by sleeves that fit over the threaded portions of the anchor bolts. The brackets are constructed to support the storage tank, which is placed in the form on top of the support assembly. The tank is then fastened to the support assembly.

Abstract: Bottle capsules (1), shrinkable onto a bottle neck, are produced by blow molding. An extruded plastic tube (2), in a thermoelastic state, is introduced into dual molds (3a) tangentially, in vertical motion from top to bottom. Each dual mold (3a) has a constriction (7) which is penetrated by a movably mounted injector (8), for introduction of a blow molding medium. The plastic tube (2) is expanded substantially radially only, and the most severe expansion occurs in the area around the constriction. The molds (3a) are mounted in a turntable (4) driven continuously about a horizontal shaft.

Abstract: A method for producing a high shock-absorbing automobile bumper with a smooth outer surface. The method includes the steps of loading a preformed surface skin member into a blow mold, and then blowing a parison in the mold so that the blown parison is bonded to the surface skin member. The result is a hollow cushioning body firmly bonded to the surface skin member.

Abstract: In a process and apparatus for the production of hollow bodies from thermoplastic material, the walls of the hollow bodies are of a laminate structure having at least first and second layers, by means of extrusion blow molding, the pressure within the extrusion head and more particularly at the location at which the laminate is formed by the discharge of flows of material from a storage chamber in the head is maintained within limits such as to avoid disturbing the laminate to such an extent as to have an adverse effect on its function. The pressure at the time of a transition between filling and emptying of the storage chamber and between emptying and filling of the storage chamber is maintained substantially at a pressure level which approximately corresponds to the storage chamber emptying pressure.

Abstract: A multi-layer material with a layer (A) of a saponified product of an ethylene-vinyl acetate copolymer having an ethylene content of 20 to 60 mol % and a degree of saponification of at least 90% and a layer (B) of a styrene-based polymer having mainly syndiotactic configuration, or a resin composition comprising 5 to 95 parts by weight of a saponified product of an ethylene-vinyl acetate copolymer (A) having an ethylene content of 20 to 60 mol % and a degreee of saponification of at least 90% and 95 to 5 parts by weight of a styrene-based polymer (B) having mainly syndiotactic configuration has gas barrier properties and markedly improved heat resistance.In a molding comprising the resin composition or the multi-layer material, contents (food) can be stored for a long period of time at ambient temperature. Moreover, after retort sterilization, the container can be heated by boiling, or in a microwave oven or a grill oven (at 220 to 240.degree. C.

Abstract: The method and apparatus for making a multi-layer plastic container with an integral handle for holding liquids and the like by enclosing a hollow parison of molten plastic which is at a blow molding temperature, pinching a portion of the hollow parison as the mold clses to form a hollow moil portion and neck portion, simultaneously pinching a portion of the hollow parison to form a hollow handle portion while leaving a portion of the parison to provide a passage from the moil poriton to the handle portion and the expanding the parison by supplying gaseous pressure to the moil portion and from the moil portion to form the container from the moil portion through the passage to form the handle.

Abstract: A multi-layer drawn polyester bottle has a neck portion having an opening on the top end and a fitted or screwed part on the periphery, a bottom portion formed by fusion bonding and closing of a pipe and a barrel portion biaxially molecularly oriented by draw-blowing of the pipe. The pipe is composed of a co-extrudate of inner and outer surface base layers of polyethylene terephthalate and an intermediate layer of an ethylene-vinyl alcohol copolymer having an ethylene content lower than 50 mole %. This multi-layer drawn polyester bottle is prepared by co-extrusion a multi-layer pipe using the coextrudate and, if necessary, interposing an adhesive layer between the two resin layers, cutting the pipe into a predetermined length, closing one end of the cut pipe by fusion bonding to form a bottom portion, forming the other end of the cut pipe into a neck portion having an opening on the top end and a fitted or screwed part on the periphery, pre-heating the so-obtained preform at a drawing temperature of 85.

Abstract: A process for preparing a laminar article with multiple thin, overlapping layers, includes preparing a melted heterogeneous blend of a polyolefin, an ethylene-vinyl alcohol copolymer, and a compatibilizer having a specified level of grafted cyclic anhydride groups; extending the body of the melt; and cooling the extended body to below the melting point of the polyolefin.

Abstract: The present invention relates to the control of grain structure in unalloyed zirconium metal and, more particularly, to the control of grain structure in zirconium metals containing less than 300 parts per million Fe.

Abstract: A multi-layer parison has a plurality of layers of main and auxiliary resins laminated with each other. An apparatus for forming the multi-layer parison includes a main resin extruding mechanism, at least one auxiliary resin extruding mechanism and a control unit for controlling the main and auxiliary resin extruding mechanisms so that the pressure for extruding the auxiliary resin is immediately increased and the pressure for extruding the main resin is gradually increased at the beginning of extrusion of the main and auxiliary resins.

Abstract: Coextrusion apparatus for varying the inner profile of a generally tubular extrudate formed by a first stream of elastomeric material by an axially movable inner die ring which varies the size of an orifice and consequently the flow of a second stream of elastomeric material which is deposited on the inner surface of the tubular extrudate. A compensating ring is axially slidably mounted within the inner die ring and moves generally in an opposite direction to the movement of the die ring to compensate for pressure changes within the second stream of material caused by varying the size of the orifice, to provide an accurately controlled initiation and termination of the material. Pistons are formed integrally on the inner die ring and compensating ring and are located within annular fluid pressure chambers whereby the flow of fluid into the chambers will coordinate the movement of the die ring and compensating ring.

Abstract: An improved bag-in-box (BIB) composite container in which the container's inner bag is blow-molded inside the container's outer box. In one preferred method the body portion, which is a heated and softened preform preferably made of polyethylene terephthalate (PET) is placed within a carton through an aperture in the carton's top end panel, followed by injecting a pressurized gas into the preform to expand it into a bag within the outer box. In another particularly preferred method, a parison is extruded into an outer carton through an aperture in the carton's top end panel, followed by injecting a pressurized gas into the parison to expand it into a bag within the outer box.

Abstract: A method of fabricating a bundle-like pipe unit using a blow molding machine having a plurality of heads feeding parisons into a molding die includes the steps of forming a plurality of hollows independent from each other in the molding die, forming one or more channels connecting the hollows to each other laterally, feeding the parisons into the hollows from the respective heads of the blow molding machine, and blowing air into the parisons in a manner such that a plurality of independent pipes are molded in the respective hollows and the pipes are joined with each other at the lateral walls by the parisons which are forced into the channels upon air blowing. Suction forces are preferably applied on the parisons when the parisons are fed into the hollows of the molding die. The pipe unit thusly fabricated is light in weight and possesses flexibility as well as anti-corrosion properties due to the characteristics of the parisons.

Abstract: An improved thermoplastic airbag for application in motor vehicle occupant restraint systems is disclosed. The blow molded thermoplastic airbag includes at least one reinforcement insert encapsulated at a preselected area on the exterior surface of the airbag. The reinforcement insert providing supplemental support during inflation of the airbag.

Abstract: In the discontinuous manufacture of multilayer, co-extruded, hose-like thermoplastics material preforms used in the production of large volume multilayer hollow members in a divided blow mold, at least two different annular shaped material melts are brought together in series within an axially extending annular piston to form a multilayer material melt. An annular flow channel in the piston receives the layers of material melt. The flow channel widens in a funnel-like manner toward an annular storage space. The preform is subsequently ejected from the storage space through an annular nozzle gap by the annular piston moving in its axial direction. The annular piston acts as a co-extrusion head and is pressed upward by the multilayer material melts. In supplying the material melts from extruders into the flow channel of the piston, the material melts flow first in the extrusion direction and then are redirected for flow radially inwardly into the flow channel of the piston.

Abstract: Blow molded container and related process are provided wherein a container having at least an upper, non-self-supporting, flexible portion is blow molded to include an integral press-lock type closure about its upper open end. The blow mold cavity is formed to provide a rib or bead about one-half the periphery of the container open end, and a hollow recess about the other one-half of the periphery of the container open end. the upper end of the finished container may be flattened along its upper edge and closed by pressing the rib into the recess. It one embodiment of the invention, the lower portion of the container may be of greater thickness, but nevertheless integral with the upper portion, so as to be stable or self-supporting. In another embodiment, the container may be non-self-supporting throughout while, in still another embodiment, the container may be self-supporting throughout its length.

Abstract: The vessel portion of a gas-tight container suitable for packaging fresh foods is produced as a composite of paperboard and polymer film. A pair of folded paperboard blanks, pre-cut and pre-formed, are inserted into the opposite halves of split mold elements to a blow molding machine. Vacuum orifices in each mold half unit temporarily secure the position of a respective paperboard blank. The paperboard lined mold halves are closed upon a hot, extruded parison of malleable polymer leaving an end portion of the parison tube projecting from the closed mold unit. A fluid conducting needle penetrates this projected end portion to inflate the parison with an appropriate blowing gas. Such inflation expands the malleable polymer, seamlessly and creaselessly, into the internal corners and crevices of the folded paperboard blanks. Following chilling, the mold unit is opened and the pair of paperboard flanks are ejected as a singular unit, joined by a molded flange portion of the continuous polymer film.

Abstract: The invention concerns a process and an apparatus for the production of hollow bodies from thermoplastic material, the wall of which is in the form of a laminate, by extrusion blow molding. Tubular preforms for making the hollow bodies are first produced in an intermittent mode of operation, the wall thereof also being in the form of a laminate which includes a suitable number of layers. Within an extrusion head having an annular storage chamber for receiving the laminate-formation preform and an annular piston for emptying the storage chamber, the flows of material for forming the layers of the laminate of the preform are passed through the annular piston into the storage chamber in which they combine to form the laminate. The width of the outlets at which the flows of material issue from the annular piston can be so selected that it is proportional to the thickness of the respective layers to be formed therefrom in the laminate produced in the storage chamber.

Abstract: A device for producing a plastic blown three-handled container uses a blow mold comprising two mold halves which can be moved towards one another. In the lower region of each mold half a partial handle shell with a wall region is inserted and a groove is provided for the external handles of the three-handled container. The device has a sliding bar for each mold half, the face of which forms at least one part of the blow mold wall when slid into position. The wall region of each partial handle shell extends to the center line of the container. Each partial handle shell has a half of a central handle, which is formed as a half channel, the edges of which extend to the center line of the container. Each sliding bar has a recess for one half of a central handle, and the face of each sliding bar forms the mold wall in the space between the mold halves.

Abstract: A method and apparatus for making a hollow blow molded article with an integral external projection such as a handle thereon. The method includes blow molding the hollow article and then injection molding the integral projection thereon. The apparatus includes a combination mold having separate and independent blow mold and injection mold cavities which communicate at an interface therebetween. In a preferred embodiment, the blow molded article with integral handle is polyethlene terephthalate (PET).

Abstract: A laminated container blow molded from an extruded parison wherein both the parison and the resultant blow molded container are of a multi-layered construction. Most particularly, the parison is provided with a thin outer gloss coat which maintains the clarity and gloss of the resultant container so as to provide the container with a glass-like appearance. In the forming of the parison, the thin gloss coat is extruded with the remainder of the parison and is bonded to the remainder of the parison by an adhesive layer. The thin outer gloss coat is particularly effective when a relatively thick intermediate layer of the parison is formed of reground scrap containers. Usually the relatively thick intermediate layer is formed of a blend of the reground scrap containers and virgin polypropylene.

Abstract: A barrier structure liner for food packages comprises two layers of EVOH (ethylene-vinly alcohol copolymers), one of which is interposed between two moisture barriers. The inner layer of EVOH (in contact with the packaged food) functions as a solvent barrier which reduces the loss of flavor components from the foods, while the buried EVOH layer, protected from moisture from the packaged food and the outside atmosphere, serves as an oxygen barrier to prevent oxygen from outside the package from oxidizing the foods within the container. The barrier structure may be used in paper cartons, plastic bottles, bags and the like.

Abstract: The process for making a plastic container by blow molding of a tubular parison made of a thermoplastic material, includes guiding a tube into a divided open blow mold, closing the blow mold and feeding pressurized air in the tubular parison squeezed off in the blow mold. However in the open blow mold which has a suitable receptacle at least one single-piece hoop ring made of thermoplastic material which could be made with usable tolerances by injection molding is mounted on the section and bonded with the tubular parison. An unsorted container ring which has an outer collar is used in the process and is fed to a preheat station in which the container ring is made stress-free and simultaneously is oriented in a plane.

Abstract: A fuel tank of synthetic resin is provided with a holding plate of synthetic resin arranged within the tank, and an outside wall covering the holding plate and formed by blow molding. Parts such as a level gauge projecting from the outside wall and having a nipple portion are held to the holding plate. At the manufacturing state of the tank, parts are fixed to the holding plate, and in this state, a blow molding mold is set and the outside wall of the tank is formed by the blow molding. In this case, the outer periphery of the holding plate is fixed to the inner circumferential surface of the outside wall, and the inner circumferential surface of the outside wall is pressed to the outer circumferential surface of the nipple portion of the component part and the circumference of the nipple portion is sealed. And then the outside wall covering the top end surface of the nipple portion is cut thereby the tank is manufactured.

Abstract: A laminar article with good barrier properties to oxygenated and hydrocarbon compounds is prepared by blending a polyolefin with about 2 to 39% of a melt blend of a nylon and a polyvinyl alcohol component, using an alkylcarboxyl-substituted polyolefin as a compatibilizer.

Abstract: A multilayer hot blown film useful in chub packaging comprises a first outer layer of a heat-sealable polymeric material; a first interior layer of a high molecular weight polymeric material; a second interior layer of a polyamide; and a second outer layer of a self-weldable polymeric material.

Abstract: A method for manufacturing large-volume hollow bodies of plastics material with multiple-layer walls. The apparatus defines an accumulation chamber and has a nozzle outlet. A plurality of material layers are joined into a multiple-layer plastic material melt within a tubular plunger which is movable in axial direction of the apparatus. The multiple-layer plastics material melt is conducted in a flow duct which widens in the shape of a funnel toward the accumulation chamber. The tubular plunger is forced by the melt to move in axial direction away from the nozzle outlet. The material melt is ejected as a multiple-layer extruded material by moving the tubular plunger in axial direction toward the nozzle outlet.

Abstract: Method in extruding a double-walled plastic tube by using plastic materials of different colors for the inner layer and the outer layer, a portion of the material for the inner layer being diverted to form a longitudinal strip of the outer layer on the outside surface of the tube. The invention also relates to an extrusion tool for working the method, wherein an element (21) is provided inside the tool to divert material from a passage (19) for material for the inner layer to a passage (16) for material for the outer layer.