Abstract: A process for the production of compacted bodies of powdered medicament is disclosed, the process comprising the steps of:a) positioning expansible means along the longitudinal axis of the mold;b) placing loose powdered medicament in the mold; andc) expanding the expansible means perpendicularly to the longitudinal axis of the mold. An apparatus for use in the process according to the invention and medicament compacts formed by the process are also disclosed.

Abstract: The invention provides a device for press forming a sheet blank (5) of the type including a die formed by a pad (2) composed of an elastic material disposed in a retaining box (1), a lower blank holder (3) which rests on the upper part of the box (1) and on which the sheet blank (5) rests, structure for preforming the sheet blank (5) constituted by an outer slide (6) carrying an upper blank holder (6a), structure for forming the sheet blank (5) constituted by a central slide acting on a plunger (7) and, in the region of heating zones of the elastic pad (2), structure (20) for regulating the temperature of the elastic pad (2) in the course of the press forming of the sheet blank (5).

Abstract: A bumper construction for vehicles constructed of a single strip of metal roll-formed into a completely enclosed tubular member in which a foamed-in-place material is located in and completely fills only a central section of the tubular member a relatively short distance on each side of the central axis of the vehicle. An apparatus is provided for manufacturing roll-formed bumpers partially filled with a foam-in-place material, the bumpers including material defining a continuous closed section defining an open interior and opposing open ends. The apparatus includes a turntable with a plurality of holders including arms shaped to extend partially into the bumpers, and a plug on the end of each arm configured to block off the open interior of the bumper. The holders are pivotally mounted on the turntable so that a bumper can be slipped onto a selected holder, pivoted to an upright position, and then rotated by the turntable under an injector for dispensing foamable reaction injectable urethane (RIM) material.

Abstract: A mold (100) is constructed by forming a shell (125) having a back surface (127) and a mold surface (126) which defines a mold cavity (150), by forming a shell base (124) about the back surface (127) of the shell (125) so as to define an enclosed cavity (134) between the shell base (124) and the shell (125), and by filling the enclosed cavity (134) with substantially incompressible material (135).

Abstract: An elastic molding die is composed of an elastomer laminate film, of which the innermost layer is formed of an elastomer not containing fillers. The innermost layer elastomer is preferably an oil-resistant elastomer. Alternatively, an oil-repellent agent may be contained in the innermost layer elastomer. The outer layer may be formed of an elastomer containing fillers. Furthermore, an oil blocking layer can be provided between the inner layer and the outer layer. A master model is dipped in an elastomer solution not containing fillers, heat dried to form a gelled elastomer film, the film is coated with a coagulant, dipped again in an elastomer solution, taken out, gelation treated, and the elastomer film is peeled from the master model to obtain an elastic molding die. In another method, a once-formed hollow elastic molding die is turned inside out, pressed in with a gas to swell, the swollen die is coated with an elastomer solution not containing fillers, heat dried, and turned it again inside out.

Abstract: A uniformly expandable mold is formed with a continuous surface defining a three-dimensional pattern for replicating an article. The relative pressure between the inside of the mold and the outside controls the area of the surface to change the size of the three-dimensional pattern without distorting the relative dimensional relationship of the component segments forming the pattern whereby material may be deposited on the mold surface with the mold expanded to a desired size. The pressure differential is increased to increase the size of the mold and stretch the layer already deposited thereon. A second, dissimilar layer is bonded to the first layer while it is streched When the article is removed from the mold, a state of relative expansive/compressive tension is created at the bond interface between the first and second layers which forces the material of one layer to enter voids in the other layer to seal defects.

Abstract: A mold for a shaped laminate having a rigid member which includes a cavity through which plastic layers are drawn in forming the laminate, such cavity comprising a deformable wall portion having a shape-sustaining configuration matching the surface contour of a rigid member of the laminate, such deformable wall portion being reshapable to another shape-sustaining configuration matching the surface contour of an alternative shape of rigid member of a different shaped laminate.

Abstract: In a process for forming composite laminate parts from reinforcing fibers and resin, a mold is selected which has a mold cavity having a part definition surface therein and a resin passageway leading to the cavity. An expansion member capable of expanding to a larger volume in response to heat is located in the cavity in conjunction reinforcing fibers which will form a part of the composite laminate part. The mold cavity is closed and resin is injected through the resin passageway to saturate the fibers. The expansion member is heated to expand the expansion member an amount sufficient to consolidate the resin and the reinforcing fibers between the expansion member and the part definition surface to shape the fibers and the resin into a component laminate part mimicking the shape of the part definition surface and to expel any excess resin from the cavity to the passageway.

Abstract: A method and device for shaping tubular workpieces from thermoplastic placs is disclosed. In the method, the workpiece to be shaped is inserted into a mold, heat is applied from the interior of the workpiece to heat the workpiece to the softening temperature of the plastic, this temperature is maintained until the workpiece assumes the shape of the mold, and the workpiece is left in the mold until it has cooled off. A flexible heating core is used to apply heat to the interior of the workpiece. The heating core has an insulating jacket with a sliding layer on its outer wall and a heating conductor winding located within the insulating jacket. A stress relief extends lengthwise in the middle of the heating core and outward of the heating core at one end. A receptacle is provided at the other end of the heating core for the stress relief.

Abstract: A method for temperature conditioning a blank of plastic material in which a conditioning mandrel is placed within the blank and thereafter expanded into reliable abutment against the inner surface of the blank. The mandrel is thereafter returned to its initial position. The outer surface of the mandrel is adjusted to and maintained at a certain temperature, whereby, during the abutment, an energy exchange takes place between the blank and the mandrel for adjusting the temperature of the blank. At high temperatures of the mandrel, the mandrel is displaced out of the blank after such short time that the plastic material in the region of the abutment surface never passes the critical temperature of tackiness of the plastic material and/or thermal crystallization of the plastic material. As a rule, the expansion and contraction of the mandrel is repeated one or more times.

Abstract: A reblow former for use in the manufacture of moulded construction products from dry particulate materials is proposed which includes an elongate body part (11) and an inflatable elastomeric sleeve (14) disposed about the body part, the body part having ribs (12) thereon to provide an indented transverse profile and the sleeve (14) having a transverse perimeter length which corresponds to that of the body part (11) and lying in intimate surface contact with the body part (11) in the non-inflated condition thereof. The transvere perimeter length of the sleeve (14) in the unstretched state thereof approximates to the transverse perimeter length of a core void (15) into which the reblow former is inserted such that, on inflation, the sleeve (14) is brought into contact with the core void surface of the core with not material stretching of the material of the sleeve.

Abstract: A method for molding powders comprises the steps of forming a mold support having at least an opening and a cavity, forming a film of latex on inner surfaces of the mold support by pouring the latex from the opening into the cavity of the mold support and discharging a substantial portion of the latex poured into the cavity, forming a thin-wall resilient mold inside the mold support by drying the film of latex formed, charging powders as materials for a compact from the opening into the thin-wall resilient mold, exhausting air out of the thin-wall resilient mold filled up with the powders through the opening and sealing the opening of the thin-wall resilient mold, separating the thin-wall resilient mold filled up with the powders from the mold support, and subjecting the thin-wall resilient mold to a cold isostatic press method treatment.

Abstract: Methods and apparatus for making self-supporting bodies from particulate materials. The apparatus includes a mold with opposed first and second walls defining a particulate chamber therebetween. The second wall is advanceable and retractable toward and away from the first wall. A plurality of chamber reducers may be removably mounted over each of the walls. Thick-walled members can be incrementally built up by pressing successive batches of particulate material at low and high pressures respectively. The chamber reducers can be successively removed between such batches, or can be used to vary the mold for making bodies of different sizes. A long body can be built up in increments, using a shorter mold, by forming a first increment, displacing the increment lengthwise in the mold, adding another batch of particulate material in overlapping relation to the first body increment, and then pressing such other batch to form a second increment bonded to the first.

Abstract: Powder is filled in an axially elongate powder filling space defiined in a flexible pressure tube, and the pressure-bearing surface of the flexible pressure tube is pressurized with a pressurizing fluid, from a wall portion of the pressure tube which corresponds to a localized region of the powder filling space progressively toward another wall portion of the pressure tube which corresponds to an end of the powder filling space, until the pressure-bearing surface of the pressure tube is pressurized in its entirety, thereby compacting the powder in the powder filling space. Therefore, air in the powder is progressively squeezed toward the end of the powder filling space where the air can be discharged. Thus, no air remains trapped in the powder, and a formed product is prevented from being damaged, which enables elongate products to be produced.

Abstract: A method of forming a shaped article from a stock of preformed, thermoplastic, syntactic foam material of hollow microspheres in a thermoplastic polymer matrix, comprising heating the preformed syntactic foam to a temperature above the softening point of thermoplastic polymer matrix and applying differential pressure over at least one surface of the foam material through the medium of a plastically deformable diaphragm member to cause the foamed material to conform to a desired shape. Shaped articles of syntactic foam material, optionally having a surface coating of unfoamed, preferably fibre reinforced thermoplastics materials are provided in a more versatile and convenient manner than curing or sintering syntactic foam material in a mould.

Abstract: A hot press for pressing industrial laminates to single-layer pressed boards having at least one heating platen, and at least one press opening in which a sealing means including an expansible and retractable hose is associated with each press opening to alternatively seal and open said press opening.

Abstract: Apparatus for producing cast products which include a filling unit wherein elastic moulds of open-bag shape are filled with non-solid materials, a solidifying unit wherein the materials are allowed to solidify in the elastic moulds, and a withdrawal unit wherein the solidified materials are withdrawn from the inside of the elastic moulds in the filling unit, the elastic mould is positioned under a vacuum when filling starts. The apparatus provides cast products without mould joint marks, low mould production costs and prevention of mould breakage as well as a great degree of production simplification.

Abstract: Apparatus for producing cast products comprises a filling unit wherein non-solid materials are filled into open-bag shaped elastic moulds through filling nozzles, a solidifying unit wherein the material is solidified in the elastic mould, and a withdrawal unit wherein the solidified product is removed from the inside of the elastic mould. The apparatus can produce cast products with high commercial values and low production costs.

Abstract: A method for molding powders which comprises introducing a thin-wall resilient mold inside a ventilative mold support, reducing the outside pressure of the ventilative mold support to less than the atmospheric pressure (760 Torr), putting a thin-wall resilient mold exactly close to the inside wall of the ventilative mold support, supplying powder material into the thin-wall resilient mold, exhausting air existing in the voids formed in the powder material, and taking the ventilative mold support apart to apply cold isostatic press treatment to the thin-wall resilient mold. The shape of the thin-wall resilient mold is similar to the shape of the ventilative mold support.

Abstract: A compact stretcher is disclosed which is erectable upon requirement. In a preferred embodiment, stretcher poles each consist of a tube of textile material impregnated with a moisture-curable polyurethane which is received within an impervious outer cover tube. The tubes and stretcher base are carried in a folded condition until erection is required when the contents of a canister containing compressed air and water are introduced into each pole. Once the two poles have been extended and the polyurethane cured, the poles are inserted into respective cavities of a canvas base to a stretcher.

Abstract: The present invention is directed to a process for the manufacture of molded parts having areas in the form of grids, grills or gratings, in which a fluid mass is introduced into the mold cavity of a molding tool conforming to the molded part and the cavity is filled by said fluid mass, characterized in that in the mold cavity, the zones provided for the apertures in the areas conforming to the said grids, grills or gratings of the molded part are first flooded by the mass and the mass is subsequently displaced from these zones, and to a molding tool to be used in such process.

Abstract: The invention is concerned with the manufacture, by winding of filamentary material, of a hollow envelope of elongate shape the profile of which evolves along its longitudinal direction. An apparatus for this purpose comprises a deformable mandrel over which the filamentary material is wound, a mould in which the mandrel carrying the winding is enclosed, and a device for flattening the envelope so produced against the walls of a cavity in a mould. The cavity wall is in the shape of the external surface of the requried envelope. The deformable mandrel comprises a rigid core and a flexible wall which is movable with respect to the core to press the winding against the wall of the mould cavity. A device may be provided for ensuring the relaxation of the tension of the threads of the winding produced when the flexible wall is in its position pressing the envelope against the wall of the cavity.

Abstract: An injection mold utilizes a collapsible core portion which includes a core portion and a mold cavity portion. A core base is provided as part of the core portion. A first mold ring is positioned about the core base and longitudinally movable to define a first annular parting line between the core base and first mold ring. The first mold ring carries outer core members and controls their longitudinal positioning along the core base while permitting them to move radially inwardly and outwardly between molding and collapsed positions. A second mold ring is carried on the core and includes stripper ring means, the second mold ring being longitudinally movable to define a second annular parting line with the first mold ring. The second mold ring also forms a third, annular parting line with the mold cavity portion. Means are provided for relatively moving the core base, mold cavity portion, and first and second mold rings in a longitudinal direction relative to each other and the mold cavity portion.

Abstract: A generally planar object 22 subject to dimensional variations is centrally held in a mold by a deformable suction ring 20, and inflatable seals 8, 9 are urged against its opposite peripheral surfaces to define a cavity 17 for the injection molding of a precisely dimensioned edge frame 23. The dimensions of the rigid mold halves 2, 3 and the elasticity of the ring and seals are such that a wide range of dimensional variations may be tolerated in the object, which may be a curved automobile glass panel, a printed circuit board, etc.

Abstract: A method of compression molding powders of metals, ceramics and the like. A thin rubber bag is adhered to the inside of a cavity formed within a permeable mold support so as to define a mold therein and the bag is packed with a raw material powder. The powder in the bag is evacuated to a degree of vacuum to compactly compress it and the rubber bag is sealed. In this condition, the compressed powder is removed from the support and compression molded to a higher degree of denseness by the CIP process. The inflation adhesion of the rubber bag to the inside of the support cavity is effected by reducing the pressure outside the permeable support.

Abstract: A collapsible, cantilevered mandrel is disclosed comprising a core rotatable about a longitudinal axis, a tubular shell having a longitudinal slit to permit collapsing of the shell, means for rigidly mounting an arcuate segment of the shell to the core such that the shell is disposed about the longitudinal axis, and means for collapsing the mandrel. The means for collapsing the mandrel includes an actuating member mounted between the core and the shell for reciprocal motion, and a plurality of linkage means connected to the actuating member. Each linkage means is connected to first and second portions of the shell on opposite sides of the slit, and is adapted to cause at least one of the first and second portions to move circumferentially towards the other portion and radially inward when the actuating member moves.

Abstract: The invention is a method of forming a composite structure which begins with the formation of a syntactic foam core having internal communication passages that terminate with a plurality of openings in the outer surface of said core. After being wrapped with a plurality of layers of porous material, the wrapped core is positioned in a cavity of a mold having an inlet communicating with one of the openings. A source of uncured resin mix then is connected to the inlet and the mold is evacuated. After being forced through the inlet and the passages to fill the mold and impregnate said fibrous material, the resin mix is cured to provide with the core and the fibrous material a rigid composite structure.

Abstract: In an apparatus such as a corrugator for manufacturing thermoplastic pipe with a corrugated outer wall and a smooth inner wall, a calibrator is employed to provide a smoother inner wall and a more rapid inner wall cooling. The calibrator includes a tube wound into a helical coil and an adjustment mechanism for adjusting the coil diameter. A cooling fluid may be passed through the tube.

Abstract: A thermoplastic container bottom is inertially spin welded into the interior of a cylindrical container body of paperboard internally lined with a layer of thermoplastic material. A body supporting mandrel has an expansible body engaging portion which is inserted into the body and subsequently expanded to define a cylindrical surface of a diameter exactly equal to that of the specified internal diameter of the body. A seating member at the end of the body supporting mandrel establishes the depth to which the container bottom is inserted into the body and is provided with a low-friction projecting resilient member which contacts the rotating bottom.

Abstract: A rotatable mandrel for making cylindrical molded articles has a plurality of aligned identical and collapsible cylindrical mandrel sections supported upon a cantilevered shaft, the cylindrical sections having a truss supported relatively thin exterior wall and retractable segment to permit circumferential contraction of the wall, the composite segmental cylindrical segment being supported by a central cantilevered rotatable shaft in turn supported by a rotatable bearing assembly on a vertical support tower, the collapsible contraction of the composite cylindrical mandrel being controlled by internally mounted power units connected to the retractable segment and the other portions of the cylindrical mandrel sections.

Abstract: Method and apparatus for the economic and controlled application of grout at each of a series of joints in a pipeline. A short cylindrical tube is positioned in said pipeline opposite one joint at a time. The tube has an outer wall somewhat smaller in diameter than the inner diameter of the pipeline. The tube has an inner rigid portion and an outer flexible portion bonded to the rigid portion only at each end. There is a through opening at about the axial center of the tube, and the flexible portion only also has a cavity therein at the same place spaced from the through opening and filled with liquid by a flexible conduit sealed to it and extending into the tube's interior to a pressure gauge. Air is sent in between the flexible and rigid portions to swell the flexible portion and urge its outer wall into contact with the inner wall of the pipeline on each side of a joint, thereby sealing off that space.

Abstract: Apparatus for drawing a mouth-neck portion of a synthetic resin bottle in the radial direction, by inserting an expanding operation zone of the apparatus into the mouth-neck portion in the heated state and expanding respective drawing pieces of the expanding operation zone in the radial direction. The apparatus includes a cylindrical wall constructed by a great number of drawing pieces, a pressing rod inserted into this cylindrical wall to expand the drawing pieces in the radial direction and an elastic tubular member to be inflated in the radial direction by high pressure compressed air.

Abstract: Fiber reinforced thermoplastic resin composites are molded and cured in a system using controlled elastomeric tooling to apply molding pressure only after temperature has been increased to a selected point. A composite material to be molded and cured is typically placed between a fixed mold surface and a movable reaction block. A container is mounted on a fixed support behind the block in a manner permitting movement toward the block. The container has an interior base generally parallel to the block and an upstanding edge extending toward the block. A pad of an elastomeric material having a positive coefficient of thermal expansion is retained in the container by the edges. The pad extends beyond the edges into contact with the block. A gap of selected size lies between the pad and the container base. As the assembly is heated during molding, the pad expands into the gap without exerting significant pressure on the block.

Abstract: A thermoplastic container bottom is inertially spin welded into the interior of a cylindrical container body of paperboard internally lined with a layer of thermoplastic material. A body supporting mandrel has an expansible body engaging portion which is inserted into the body and subsequently expanded to define a cylindrical surface of a diameter exactly equal to that of the specified internal diameter of the body. A seating member at the end of the body supporting mandrel establishes the depth to which the container bottom is inserted into the body and is provided with a low-friction projecting resilient member which contacts the rotating bottom.

Abstract: A polymer-impregnated concrete product is obtained by placing a concrete mix in a frame capable of withstanding high temperature and high pressure in such a manner as to form therein a hollow portion, molding the concrete mix to obtain a concrete article containing a hollow portion therein, causing the concrete article as held in a tightly closed state in the frame to be cured by application of heat, subjecting the concrete article, as retained in the frame, to treatments for drying and deaeration, then supplying a monomer preparation to the hollow portion of the concrete article, applying pressure to bear upon the concrete article thereby causing the monomer preparation to be diffused into the fine voids in the concrete article, and heating the concrete article in situ thereby allowing the diffused monomer to be polymerized.

Abstract: A curved mandrel, method of making same, and method of curing an uncured polymeric hose employing such curved mandrel are provided and the curved mandrel comprises a plurality of members disposed in end-to-end relation to define the configuration of the mandrel including a predetermined curvature therein, interlocking portions for interlocking the members in only one position to define the configuration and curvature, and a readily attachable and detachable device for holding the members axially against each other after interlocking wherein the members with the interlocking portions and holding device are adapted to provide a substantially straight mandrel for installation of an uncured straight hose therearound, define the configuration and curvature in the mandrel and uncured hose, and provide looseness and axial spacing between members to enable easy withdrawal of the cured curved hose from around the members.

Abstract: A molding system for molding large diameter chimney liners of fibreglass reinforced plastic (FRP) utilizes a vertically oriented cylindrical mold for use in combination with a working platform mounted on a vertical ram. The mold is of modular construction, having a plurality of axially spaced-apart spiders, each spider being segmented into a plurality of adjoining tri-angulated segments to form a polygon, to the outer sides of which are attached chordal segments to complete the circular form of the spider. Vertically axially extending ribs interconnect the spiders, with a flexible skin being applied thereabout. The provision of expansion means on the spiders increases the diameter of the mold to its working diameter, so that, upon completion of molding a liner, the action of the spider expansion means is reversed, causing contraction of the mold sufficient to facilitate ready axial separation of the mold and liner.

Abstract: A process and arrangement for introducing a material such as a foam into automobile body cavities for at least one of noise insulation or increased rigidity. The cavities may be provided with open spaces or be adapted to only be partially filled with the foam. A bag is initially introduced into the cavity with the bag being provided with a filler opening. The volume capacity of the bag corresponds approximately to the volume of the automobile body cavity or a portion of the body cavity which is to be filled with the foam. A mixture of expandable components is introduced into the bag and, following an expansion reaction or a setting, the foam fully fills the bag.

Abstract: A mold for molding a boot or similar footwear from an elastomeric composition and simultaneously lining the footwear with a fabric, has first and second shells each having a cavity which complements the cavity of the other to form a large cavity which corresponds to the upstanding sides of the footwear and a third shell which has a cavity corresponding to the sole thereof. The three shells are assembled together with a rigid core member enclosed therein which defines the inside of the boot. The core member has an elastically expandable casing. Conduits are arranged in the core member for conveying a fluid under pressure to expand the casing.

Abstract: The mandrel has a cantilever-type mounting and includes a rotatable longitudinally slit tubular steel shell providing a molding surface on which thermosetting resin and glass fiber reinforcing material may be deposited to form tank bodies or pipe. A row of pneumatic actuators mounted inside the shell and spaced axially thereof includes piston rods attached to the shell along the slit on one side thereof. Retraction of the piston rods collapses the shell, which is flexible over the greater portion of its periphery and supported in the flexible portion by a plurality of rows of pivotable turnbuckle connectors or support rods, for removal of a cured tank body or pipe.

Abstract: A method and apparatus for forming a heated end of a plastic pipe into a bell having a sealing groove therein arranged to receive a seal so that it may be sealingly joined with a plain end of a second pipe inserted therein. The apparatus comprises a mandrel base rigidly secured to a mandrel core having annular grooves formed thereabout communicating with a vacuum source through a passage formed in the core and base. A mandrel shell comprising four separable segments is secured on the core. The mandrel shell has a plurality of apertures formed therein communicating with the annular groove on the core such that a vacuum may be drawn through the apertures. A heated plastic pipe is forced over the mandrel shell until it engages a tapered shoulder formed on the mandrel base, thus forming a seal between the end of the pipe and the base. A vacuum is drawn on the cavity formed between the plastic pipe and the mandrel shell thus drawing the plastic pipe to the shell, forming an annular internal groove in the pipe.

Abstract: The invention relates to a method and apparatus for making hollow, resin-impregnated fibrous fabric articles. Specifically, it relates to a method wherein a reusable mandrel is made sufficiently rigid to receive a lay-up of the article to be manufactured. The rigidized assembly is placed within a female mold, derigidized and expanded to apply pressure from within, thereby forcing the lay-up against the interior of the mold. Heat is applied to cure the resin, producing an article having a very high degree of dimensional accuracy.

Abstract: In a method for the preparation of crosslinked polyolefin foams by charging a polyolefin or its blend with other thermoplastic resins containing a crosslinking agent, foaming agent and if necessary a filler into the heated mold having a changeable cavity and, after decomposition of the crosslinking and foaming agents, retracting the moving-plate of the mold by a definite distance to increase the cavity and at the same time cooling the mold, an improvement for the preparation of the crosslinked polyolefin foams having excellent appearance and dimensional stability, comprising using a mold of which the moving-plate is constructed with a body and a sliding-piece, the body holding the piece slidably whereby the sliding-piece is left behind owing to sliding between the two even on rapid retraction of the body and then retracts at the rate corresponding to the foaming pressure of the resin, in other words, at a self-controllable rate and the mold for the preparation thereof.

Abstract: A device for deflecting a continuously supplied thread by means of a curved guide tube. The guide tube is formed of a plurality of contiguously abutting segments which are disposed between the entry and exit openings of a casing. The space between the inner wall of the casing and the outer circumference of the segments is filled with a bonding agent which fixes the segments in the desired spatial curvature for the guide tube when it hardens. Furthermore, a method for producing such device is disclosed which utilizes an expandable mandrel to hold the segments in the desired spatial curvature position prior to being fixed in position by the bonding agent.

Abstract: A device for forming a tube of plastic material with a socket having an annular corrugation has a tube supporting core and a plurality of radially movable segments provided adjacently with contacting wedge surfaces, the segments in outwardly shifted position defining a circumferentially beaded portion for forming the annular corrugation on the supported tube.

Abstract: A method for avoiding cracking of the molded body during the decompression step in an isostatic pressing method of molding. The powders to be molded are housed in a shaping rubber mold, are molded under pressure, and the improvement is characterized by supplying forcibly gas between the outer peripheral surface of a molded body or a shaping thin rubber bag where the molded body is housed and the inner peripheral surface of the shaping rubber mold, the gas having a pressure higher than the isostatic pressure applied to the shaping rubber mold at the time when the shaping rubber mold begins to restore to its original state during the decompression step of the method. An apparatus for the said compression molding which is equipped with a specially designed pressure gas inletting device.

Abstract: A thermoplastic container bottom is inertially spin welded into the interior of a cylindrical container body of paperboard internally lined with a layer of thermoplastic material. A body supporting mandrel has an expansible body engaging portion which is inserted into the body and subsequently expanded to define a cylindrical surface of a diameter exactly equal to that of the specified internal diameter of the body. A seating member at the end of the body supporting mandrel establishes the depth to which the container bottom is inserted into the body and is provided with a low-friction projecting resilient member which contacts the rotating bottom.