Abstract: A pipette may comprise a length, a longitudinal axis, and an inner curved surface enclosing a space. The pipette may have a tip region having a tip thickness. The tip region may be connected to a body region having a body thickness. The tip thickness may be greater than the body thickness. The body region may be connected to a mouth region having a mouth thickness. The mouth thickness may be greater than the body thickness. The inner curved surface may not contain bumps or ridges either between the tip region and the body region or between the body region and the mouth region. The pipette may be formed by blow molding or vacuum forming.

Abstract: An extrusion blow mold machine forming hollow containers. The machine has at least one pair of opposing half molds that combine to form a mold and define a mold cavity. Each of the half molds is positioned on a carrier plate and includes first, second, and third mold segments. The first and third mold segments can move with respect to each other and with respect to the second, fixed mold segment. A mechanical structure creates vertical movement of the first and third mold segments relative to the second mold segment as the mold opens horizontally, without the aid of any electrical, hydraulic, or pneumatic device. A closing unit engages the carrier plate to move the carrier plate and its respective half mold toward and away from the opposing half mold and its respective carrier plate, thereby closing and opening the mold.

Abstract: The present invention relates to a process for making a container having an integral handle, comprising the steps of: a) providing a preform (1) in a mould cavity (2); b) stretch-blow moulding the preform (1) to form an intermediate container (3); c) applying one or more inwardly moving plugs (5) to form one or more concave gripping region(s), whilst maintaining the pressure within the intermediate container (3) above 1 bar and whilst the temperature of the material in the gripping region of the intermediate container is at a temperature below the glass transition temperature, Tg; d) releasing excess pressure within the container, preferably prior to withdrawing the plug (5) from within the container; and e) ejecting the finished container(6) from the mould cavity (2,4).

Abstract: A method of vacuum-assisted RTM includes disposing a resin distribution medium on one surface of a reinforcing-fiber substrate, covering the whole with a bag material, reducing the pressure inside the bag material, and injecting a resin into the resin distribution medium to distribute the resin substantially in in-plane directions and then impregnate the resin into the reinforcing-fiber substrate in the thickness direction.

Abstract: An injecting/blowing device includes a mold for injecting a thin-walled hollow preform capable of being transformed into a more voluminous hollow body. The mold includes a counter mold defining a cavity, a cure located in the cavity, and a preform impression located between the counter mold inner surface and the core which will receive the melt, at least two main preferential flow channels or at least two secondary preferential flow channels having a recessed zone at the surface of the core and the inner surface of the cavity. The main flow channels are located only at the impression zone corresponding to the zone for transforming the perform, and in the optional secondary flow channels are flow channels discontinuous from the main flow channel.

Abstract: In one embodiment, a vehicle energy absorber system, comprises: blow molded crush lobes that are open on one side, wherein the energy absorber comprises fillets having a fillet radius of less than 20 mm and a thickness of less than or equal to 1.5 mm; a bumper beam adjacent the open side; and a fascia, wherein the energy absorber is located between the fascia and the bumper beam. In one embodiment, a method for making a blow molded energy absorber comprises: introducing a molten plastic to a first mold cavity; introducing gas into the plastic to conform the plastic to the interior of the first mold cavity and form a first preform; and separating the first preform along a centerline thereof to form open, first preform portions having first crush lobes.

Abstract: The disclosure relates to a threaded shaft for a roller screw drive, for example for an electromechanical brake booster or an electromechanical power steering system. According to the disclosure, a helical coil with a flat, square-threaded annular cross-section is arranged on a thin-walled pipe, the pipe being formed onto a root region of the helical coil by the application of high pressure from the inside of the pipe.

Abstract: A method and apparatus for molding a plurality of tiered containers from a single parison. Two or more parisons can be arranged next to each other. A molding apparatus of this invention can have one or more mold sections that can be operated in a controlled fashion to form a stacked or tiered arrangement of containers from a single parison or can be arranged to form an array of containers including two or more columns of containers each having two or more tiered containers, all during a single cycle of the molding apparatus. Each container formed by the method and apparatus of this invention can be blow molded and/or vacuum formed and/or filled and/or sealed. Each seal can be a hermetic seal or any other suitable seal formed through a molding step.

Abstract: A method of forming a fishing rod with at least one integrally formed support includes providing a bladder over a mandrel, wrapping a resin-impregnated material over the bladder to provide a wrapped resin-impregnated material, removing the mandrel from the wrapped resin-impregnated material, folding the wrapped resin-impregnated material onto itself at least once to form a tubular body, wherein folding the wrapped resin-impregnated material forms at least two separate bladder portions and the integrally formed support within the tubular body, placing the tubular body into a mold, and molding the tubular body to provide the fishing rod with the integrally formed support.

Abstract: Strips containers are formed using two continuous webs in thermoformable and heat-sealable material facing each other. The webs are indexed along a feed line through different operating stations that transform the webs into a continuous strip of containers, each one of which is provided with a mouth. The containers are arranged according to two parallel rows that are opposed to a longitudinal median zone. The mouths of the containers of the upper row are arranged on the upper longitudinal edge of the strip and face upwards, whilst the mouths of the containers of the lower row are arranged on the lower longitudinal edge and face downwards. The method enables productivity to be increased and waste to be reduced.

Abstract: A technique for allowing the convenient and orderly withdrawal of contents is disclosed. An apparatus according to the technique may include a container which includes an enhancement at the rim of the container. The enhancement provides the functionality to move edible and/or inedible substances onto objects. In one example, the enhancement may protrude inwardly as a smoothed surface that may push substances onto objects as the objects are removed from the container.

Abstract: Process for producing plastic containers, including an extrusion blow molding machine, is disclosed. For example, in an extrusion blow molding process for plastic bottles, in which plastic tubing (T) which has been extruded from an extruder head (4) in a definable cycle is placed in the mold cavity (7) of a blow molding tool arrangement (6), the inserted plastic tubing is inflated via an infeed blow mandrel by overpressure according to the mold cavity and is then removed from the mold. The extruded plastic tubing (T) is inserted into a mold cavity (7) which is composed of several blow mold cavities (71, 72, 73) which are located axially under one another, two of the blow mold cavities (71, 72) at a time being arranged mirror-symmetrically to one another and connected on their mouth regions and an individual blow mold cavity (73) being separated from the bottom section of the adjacent blow mold cavity (72) by a land region and having a mouth (10) on the outer surface of the blow molding tool arrangement (6).

Abstract: A mold is provided for use with a wheel-type blow mold machine, the mold being one of a plurality of molds for locating in a circular pattern on a wheel of the blow-mold machine and having a longitudinal direction for aligning tangentially with a circumferential direction of the mold wheel and a transverse direction perpendicular to the longitudinal direction. The mold has a first part and a second part. The first part has a first molding portion with a longitudinal end in the longitudinal direction of the mold and a first end portion adjoining the first molding portion at the longitudinal end of the first molding portion and having a free edge opposite the first molding portion, the free edge being non-parallel to the longitudinal direction and the transverse direction. The first part also has an outer cooling circuit located in the first end portion, and an inner cooling circuit located in the first end portion at a different location in the transverse direction than the outer cooling circuit.

Abstract: Post-mold cooling of injection molded plastic articles such as preforms is achieved by transferring the articles directly from the mold cavities onto cooling cores carried by a take-out plate. The molded articles are supported on the cooling cores until they become sufficiently frozen that they can be stripped from the cores.

Abstract: Process for manufacturing a breathing bag including a connector portion and a distensible portion including the steps of providing moldable material, forming a portion of the moldable material into the connector portion of the breathing bag and forming another portion of the moldable material into the distensible portion of the breathing bag. The moldable material may be provided by extruding a parison of thermoplastic material; the connector portion of the breathing bag may be formed by compression molding and the distensible portion of the breathing bag may be formed by blow molding or blow and vacuum molding; such distensible portion and connector portions are formed or molded integrally. A breathing bag made by such process.

Abstract: An additive system for polyester polymers comprising an effective amount of (i) a fatty acid amide selected from the group consisting of oleyl palmitamide, ethylene bis stearamide, ethylene bis oleomide, and stearyl erucamide; (ii) a partially or fully calcined porous poly(methylsilsequioxane); and (iii) a stabilizer comprising a primary and a secondary antioxidant.

Abstract: A handled container includes: a container body formed by blow molding in a blow mold and having an inwardly depressed portion in a bottom portion; a carrying handle formed integrally with the container body by blow molding at a position corresponding to the depressed portion in the blow mold; and an insertion space formed between the handle and the bottom of the container body for inserting two or more fingers. The container body has a ground-contact portion which has a continuous shape and is formed in an outer periphery of the bottom portion; the depressed portion is formed by depressing the bottom portion of the container body inwardly from the ground-contact portion; and the handle is formed to be positioned inwardly from the ground-contact portion within the depressed portion of the container body.

Abstract: The disclosure relates to a packaging container and a method of producing a packaging container for liquid contents. The packaging container has a casing produced from a web-shaped multilayer material and in the form of a sleeve, which, at one end, is connected to a bottom portion and at the other end is connected to a top portion produced from a blow molded thermoplastic material. The casing is formed by winding of the multilayer material into sleeve form and liquid-tight sealing of the material edges to a joint seam extending longitudinally of the sleeve, the top portion being manufactured in that thermoplastic material is extruded to form a hose which is blow molded into continuous top portions which are separated from one another and connected to the sleeve.

Abstract: In blow molding, each mold has two or more cavities, each respectively fed by two or more parisons. Each cavity fed by a separate parison may itself include two or more article cavities aligned with its parison.

Abstract: The disclosure relates to a packaging container and a method of producing a packaging container for liquid contents. The packaging container has a casing produced from a web-shaped multilayer material and in the form of a sleeve, which, at one end, is connected to a bottom portion and at the other end is connected to a top portion produced from a blow molded thermoplastic material. The casing is formed by winding of the multilayer material into sleeve form and liquid-tight sealing of the material edges to a joint seam extending longitudinally of the sleeve, the top portion being manufactured in that thermoplastic material is extruded to form a hose which is blow molded into continuous top portions which are separated from one another and connected to the sleeve.

Abstract: A production method is disclosed for separating integrally attached gutter flash from a blow-molded thermoplastic resin product utilizing tensile forces applied to the gutter flash while the product is fully restrained within the closed co-operating product mold in which the product is formed, as well as different embodiments of apparatus suitable for accomplishing the production method in a conventional industrial blow-molding machine.

Abstract: A process for blowing a balloon from a tubular parison of a thermoplastic polymer material by radially expanding the parison at an elevated temperature and pressure, the process characterized in that: a) the polymer material includes a “H-bonding” polymer which undergoes interchain hydrogen bonding between at least some segments thereof; b) the parison is conditioned in a high moisture environment prior to blowing, and c) the balloon is blown after moisture conditioning of the parison and without an intervening drying thereof. H-bonding polymers may be polyamides, polyurethanes or block copolymers containing a polyamide or polyurethane block. The process reduces occurrence of fish eye defects in the formed balloons.

Abstract: A method of making molded components including supplying a plastic material to a mold to form a molded article and actuating a separating apparatus to at least partially separate the molded article into at least two components. An apparatus for making molded components including a cavity, a separating apparatus coupled to the cavity and configured to at least partially separate a molded article into at least two components.

Abstract: At least one blow-molded plastic container and one compression molded lid are simultaneously produced in a blow mold. Preferably, the method and apparatus utilize a mold capable of simultaneously receiving a pair of extruded parisons. One of the parisons is utilized to produce a pair of aligned container bodies and the other of the parisons is utilized to form a pair of aligned closures. In this manner, a container and closure combination can be manufactured having perfect color matching and can be readily recycled in its entirety. In addition, the method and apparatus according to the present invention significantly reduces tooling costs and required machine capitol.

Abstract: In the process and machine of the invention, two strips (A and B) of heat weldable material are supplied, reciprocally facing one another, in an advancement direction (F). The strips are welded at predetermined welding zones and give rise to cells (4) each having at least one opening (5). A part of the welding zone which surrounds the cell (4) is cut, folded and inserted, together with the cell (4), in a forming cavity (71). A forming fluid is injected into the opening to expand the cell internally of the forming cavity. The invention enables plastic containers to be made which are free of projections in the welding zone and which have a low risk of container leakage through the welding seams on the lateral walls and on the bottom of the container.

Abstract: Shuttle blow molding apparatus having an extruder or a blow head for substantially continuously emitting a thermoplastic material in tubular or parison form at a moldable temperature downwardly along a vertical axis. A finite length of the thermoplastic material is grasped by a first mold set, which then moves downwardly with respect to the extruder or blow head to provide clearance for a second mold set to move to a position to grasp a second finite length of the emitted thermoplastic. The first mold set is then moved horizontally away to permit the emitted thermoplastic length therein to be blown into a hollow article, and thereafter removed from the first mold set that is permitted to return and engage an other finite length of the thermoplastic material. The second mold set follows the first mold set in a path of travel traced by the first mold set.

Abstract: A method of manufacturing and handling parts for a packaging container comprises the steps of producing a number of tops in the form of pairwise reversed tops, separating the pairs one from another and providing them with closure arrangements. The tops may be manufactured by blow molding an extruded hose of thermoplastic material.

Abstract: In the production of hollow plastic receptacles from two areas of a strip of starting material, all of each receptacle can be formed from the strip, or half of each receptacle can be formed from the strip with the halves welded together to complete the receptacles. Outside of part of at least one of the fusion seams, a marginal piece of waste segment forms at least one hollow body.

Abstract: The disclosure relates to a packaging container and a method of producing a packaging container for liquid contents. The packaging container has a casing (2) produced from a web-shaped multilayer material and in the form of a sleeve, which, at one end, is connected to a bottom portion (4) and at the other end is connected to a top portion (3) produced from blow moulded thermoplastic material. The casing (2) is formed by winding of the multilayer material into sleeve form and liquid-tight sealing of the material edges to a joint seam (9) extending longitudinally of the sleeve, the top portion (3) being manufactured in that thermoplastic material is extruded to form a hose (15) which is blow moulded into continuous top portions which are separated from one another and connected to the sleeve.

Abstract: A method of producing parisons of thermoplastic material, which includes the steps of injection of plasticized resin into a plurality of multiple-cavity molds, removal of the parisons from the respective injection molds and transferring parisons to conditioning stations to go through a temperature conditioning phase. The parisons are held in the conditioning stations for a pre-determined length of time, and then the parisons are transferred into appropriate blow molding tools in order to blow the conditioned parisons. Further, during the conditioning phase, the temperature of the surface of the collar of the parison is caused to increase, while the temperature of the parison body is allowed to decrease, so that at the end of the conditioning phase the temperature of the surface of the collar of the parison exceeds by approximately 15 to 20° C. the temperature of the parison body.

Abstract: A biaxially oriented polyethylene terephthalate resin bottle-shaped container, and method of blow-molding the same, is disclosed. The method comprises the steps of heating the body portion of a preform at 90.degree. to 130.degree. C., biaxial-orientation blow-molding the preform in a primary blowing mold heated at 110.degree. to 230.degree. C. to form a primary intermediate molded bottle-shaped piece, heating the primary intermediate molded bottle-shaped piece at 130.degree. to 255.degree. C. or at a temperature which is at least 20.degree. C. greater than the primary blowing mold temperature to form a secondary intermediate molded bottle-shaped piece, and blow-molding the secondary intermediate molded bottle-shaped piece in a secondary blowing mold heated at 100.degree. to 150.degree. C. to form a bottle-shaped container. The temperature of the secondary blowing mold is several degrees greater than the maximum temperature the molded bottle-shaped container will be subjected to during use.

Abstract: A method for producing containers, such as bottles or the like, with a film made of thermoplastic synthetic material, and to an apparatus for performing the method. The process comprises: a step for thermally bonding two strips of film made of thermoplastic synthetic material that face one another, so as to form, between the two strips of film, pouches that are open at a longitudinal edge of the strips of film; and a thermoforming step, during which a segment of the two strips of film, in which the pouches are formed, is inserted in a forming mold that is provided with molding cavities located at the pouches, and a pressurized fluid is injected into the pouches through their open side to form them, by plastic inflation, inside the molding cavities.

Abstract: An article, such as a card of thermoplastic material containing vials, is molded by a method and apparatus which deforms a portion of the mold flash so as to form a reference surface. In a preferred embodiment, the article has a pair of lower walls extending from a central wall in a generally inverted V-shape configuration diverging from an apex which defines a downwardly facing reference surface from which a predetermined reference position can be established for subsequent operations. A conveyor belt can be employed to engage the reference surface and support the article at the reference position.

Abstract: The present invention is drawn to a blow molded article having a deep recessed lip wherein the lip includes a folded reinforcing layer adjacent a hollow U-shaped portion. The reinforcing layer is formed by the parison folding over on itself in the mold while forming the U-shaped lip. The folded portions are pinched together within the mold and are welded to one another. At various portions around the circumference of the lip, vents are inserted to relieve the pressure within the lip during release of the internal pressure within the molded article.

Abstract: A method for manufacturing a cage of a polymeric material for a radial rolling bearing with two end rings formed at the cage and arranged at a distance to each other in the axial direction and crossbars spaced behind one another in the peripheral direction connecting the end rings and forming pockets for receiving rolling elements, each crossbar being formed by two relatively thin-walled crossbar walls delimiting the neighboring pockets and a connecting section situated between the crossbar walls, and a device for executing the method.

Abstract: A process for producing blow-molded containers having thickened flanges. The process utilizes movable mold halves having separable side and end components and a stationary central mold element disposed between the movable mold halves to form containers having thickened radial flanges. The movable mold halves and stationary central mold elements together enclose a mold chamber. After the parison of thermoplastic material has been blow-molded to conform to the mold chamber but while the material is still moldable, the movable mold halves simultaneously move together along the axis of the mold chamber to press the material against the stationary central mold element and thereby fold and bond the material onto itself, forming a thickened radial flange on each container. The flanges are each substantially twice as thick as a single layer of blow-molded material. The thickened flanges may also be formed to each include a thickened axial lip of material extending down from the respective radial flanges.

Abstract: The apparatus includes advancement clamps which move two mutually facing films along an advancement direction on which the following are arranged in sequence: two welding half-molds, which by mutually welding the two films in preset regions define cells which are open toward a longitudinal edge of the films; two half-molds for heating the welded films; a cell forming station. Air injection nozzles, inserted between the two flaps of the films on the side of the above mentioned longitudinal edge, and two forming half-molds, in which forming cavities are defined at the cells, operate in the forming station. Divaricators for divaricating the two flaps of the films are provided proximate to the forming station so as to facilitate the insertion of the air injection nozzles.

Abstract: A blow molded article and an apparatus and method for blow molding the article including a recessed lip. The apparatus includes two plates reciprocally movable toward and away from one another A center ring member and a separating ring are fixedly and perpendicularly mounted on each plate. A mold half is mounted on each plate and is divided into two sections. One section is located on each side of the center ring member and is reciprocally movable toward and away from the center ring member. A first insert member is provided in each mold section in proximity to said center insert member. The first insert has a channel therein for receiving a second insert member. The second insert member is reciprocally movable in said channel and engages the center ring member. The movement of the second insert member is synchronized with respect to the first insert member to move at a speed that is at least half the speed of the first insert.

Abstract: A process for the production of tighthead drums having dimensional stability of the injection molded lids and blow molded drum bodies, comprises blow molding double drum bodies from plastic and centrally separating them into two drum bodies. Tighthead lids are produced by injection molding from plastic. The tighthead lids are then welded to the drum bodies. Widemouth drums are also produced by blow molding double drum bodies from plastic and centrally separating them into two drum bodies, but with a molded-on edge at a distance under the drum opening. Drum lids are injected molded from plastic with an outside flange molded-on the lower lid edge. A sealant of plastic is injected into the lids and the lids are positioned on the drum bodies sealed with a clamping ring.

Abstract: An apparatus for producing blow-molded containers having thickened flanges. The apparatus utilizes major mold halves and a plurality of minor mold elements disposed within the mold halves to form containers having thickened flanges. The minor mold elements move radially relative to the mold halves and the joined pair of containers. While the blow-molded material is still moldable, the minor mold elements move radially inward to fold and bond the material onto itself, forming a pair of thickened radial flanges on each container. The flanges are each substantially twice as thick as a single layer of blow-molded material. Longitudinally-oriented reinforcing ribs are formed at the interstices of the minor mold elements which link the two thickened flanges and further strength the containers.

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: 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 mold and a process for controlling the weight and wall thickness distribution in a blow molded plastic manufactured article or a family or related articles involves simultaneous formation of the manufactured article and a waste article. The waste article is removed and recycled to manufacture further articles. The waste article forming chamber increases the apparent depth of the manufactured article chamber to create a larger apparent surface area, so that the parison is being blown over a much larger surface area, creating a reduced actual part weight and actual wall thickness.

Abstract: The present invention is directed to a blow molded article and an apparatus and method for blow molding the article. The article contemplated by the present invention includes a recessed lip. The apparatus includes two plates reciprocally movable toward and away from one another. A center ring member and a separating ring are fixedly and perpendicularly mounted on each plate. A mold half is mounted on each plate and is divided into two sections. One section is located on each side of the center ring member and is reciprocally movable toward and away from the center ring member. A first insert member is provided in each mold section in proximity to said center insert member. The first insert has a channel therein for receiving a second insert member. The second insert member is reciprocally movable in said channel and engages the center ring member.

Abstract: A foamable plastic material is introduced to an extruder to produce a tubular parison of the material that is subsequently clamped between mold halves moving both axially and radially inwardly to form cavities for open mounted containers. Cavities for two containers are provided with each set of mold haves clamped together around the parison at the middle of the mold set to provide individual container cavities extending on either side of the clamped portion, said individual cavities terminating in the mouth portion of the container cavity which is joined in a mouth to mouth relationship with an individual container cavity of the next set of mold halves.

Abstract: A method of producing a pair of container bodies. A cylindrical, hollow preform of a thermoplastic polymer material having a cylindrical body having a sidewall and an opened neck finish on each longitudinal end of the preform is provided. The preform is heated to a temperature above the glass transition temperature of the polymer and below the melting temperature of the polymer, and is stretched. The preform is stretched longitudinally by applying force to at least one of the ends, and is stretched transversely by introducing fluid pressure into the preform sufficient to form a stretch blown component having a first neck at one end and a second neck at the other end, and a body portion between the necks. The stretch blown component is separated transversely through the body to provide two container bodies, each having a neck finish corresponding dimensionally with the respective neck finish on the preform from which the container bodies are stretch-blown.

Abstract: An apparatus and method for blow molding a recessed lip in a molded article. The apparatus includes two plates reciprocally movable toward and away from one another. A center ring member is fixedly and perpendicularly mounted on each plate. A mold half is mounted on each plate and is divided into two sections. One section is located on each side of the center ring member and is reciprocally movable toward and away from the center ring member. A first ring member is affixed to each section in proximity to the center ring member and has a channel. A second ring member is reciprocally movable in the channel and engages the center ring member. The recessed lip is molded between the center ring member, the first ring member and the second ring member.

Abstract: According to the preferred embodiment of the present invention, an apparatus for forming base cups for plastic bottles is disclosed wherein a hollow body is blow molded and then cut in half to form two base cups. The side wall of the body is molded with a pair of outwardly extending projections such that when stacking a plurality of base cups, the projection of one cup engages the top lip of the adjacent lower cup thereby making denesting of the top cup easier. After molding the hollow body, the body is transferred to a carrier having clamps for engaging the end walls of the body to move and rotate the bodies past a knife for cutting the body in half to form the two base cups.

Abstract: Apparatus and method are provided for expanding an earlier-extruded portion (42) of extruded plastic tubing (38) or plastic parison (41) into a first container (96a), for expanding a later-extruded portion (43) of the extruded plastic tubing (38) or parison (41) into a second container (96b), for delaying exanding the second portion (43) with respect to expanding the first portion (42) into the first container (96a), and for subsequently separating the second container (96b) from the first container (96a).

Abstract: A method of producing a uniform silica glass block comprising using silica powder as a raw material, and treating it at high temperature and pressure by a hot press and/or a hot isostatic press in vacuum or in an inert gas atmosphere, preferably with a capsule of silica glass or a high-melting point metal. By conducting calcination in fluorine, chlorine or their compound gas and then in oxygen, the OH group content of the silica glass can be reduced dramatically.