Abstract: At a temperature at the time of molding, an end surface of an ejector pin in a sliding direction is as high as or higher than an upper surface of an upper surface portion of a mold body, the upper surface being adjacent to a cavity on the ejector pin side.

Abstract: Provided is a device for treating containers and in particular plastic containers, including a first transport device having a continuous carrier on which a first plurality of transport elements are moveably arranged, each having at least one retainer for retaining plastic preforms and being designed and configured to transport said plastic preforms along a first transport path, and including at least one heating device arranged along the first transport path in order to heat the plastic preforms at least in sections during their transportation along the first transport path.

Abstract: A method of blow molding a glossy article having at least one layer of thermoplastic material. The method comprises the steps of feeding a parison of said thermoplastic material into a mold having an inner surface with at least a portion of SPI finish standard selected from the group consisting of A-1, A-2, A-3, B-1, B-2 and B-3 mold and a first temperature of greater than 55° C.; blowing the parison against the inner surface of the mold to form the article; and subsequently lowering the temperature of the mold to a second temperature of between 10° C. to 55° C. before release of the molded article. The cycle time of the mold (tct) is less than 250 seconds.

Abstract: The invention relates to a device for casting a ring-shaped plastic frame. The device includes a first mold part and a second mold part, a rotor having at least one recess, and a mold core. The mold core includes at least one casting channel configured to connect to a supply one end. The mold parts may also include at least one mold insert. The mold volume is at least partially defined by the at least one mold insert, the at least one recess of the rotor, and the mold core. The mold volume is fluidly connected to the other end of the at least one casting channel.

Abstract: A method and apparatus for preparing a plurality of coated binder units are disclosed. A coated binder is divided into a plurality of coated binder units by applying a pair of dividing elements to the coated binder and applying a welding element.

Abstract: A system for printing a label for a molded object is provided. The system includes a molding machine. A mold is provided having a first part and a second part, the mold being removably coupled to the molding machine. The mold first part and second part being movable between an open and closed position. An RFID module is coupled to the mold first part. An RFID reader is arranged to receive a signal from the RFID module when the mold first part is in the closed position. A controller is operably coupled to the RFID reader, wherein the controller includes a processor that is responsive for receiving an object identification data in response to the RFID reader receiving the signal from the RFID module. A printer configured to print a label including the object identification data in response to the controller receiving the signal.

Abstract: A multiple-chamber container that is extrusion blow molded with a single neck finish and a method to trim the single neck finish is provided. The physical appearance of the multiple-chamber container before the trimming process differs from the multiple-chamber container after the trimming process. The multiple-chamber container includes multiple openings that are configured to engage with a single cap after the trimming process to create a seal. The multiple-chamber container may contain different materials, such as liquids, gel-like substances, granular materials, food, etc. that are not permitted to flow from one chamber to the other chamber when the cap is engaged with the chamber openings.

Abstract: In a fixing member 110 formed with an insertion hole 113 for inserting an elevation rod 111, a communication hole 114 communicating with the insertion hole 113 is formed to open at a side surface of the fixing member 110. A key member 112 is inserted into the communication hole 114 and engaged with a key groove 118 provided at the distal end of the elevation rod 111. By so doing, the elevation rod 111 and the fixing member 110 are coupled together.

Abstract: A device for heating thermoplastic preforms, including a heating channel formed from a heating module and through which the regions of the preforms to be heated are guided by a conveyor device. Radiant heaters are arranged on a side wall of the heating channel. In the region of a side that lies opposite the radiant heaters and/or the base of the heating channel, reflector elements which act as counter or base reflectors are arranged. The reflector has a reflection layer and a carrier layer. The reflection layer includes a material with a silicon dioxide base and an IR reflection value greater than 90% in the range of 500 to 2500 nm. The carrier layer is a material with greater mechanical strength than the reflection layer and is used as a carrier for the reflection layer. Both layers have a similar coefficient of thermal expansion and are permanently interconnected.

Abstract: An apparatus for forming a container generally comprises a first mold part having an injection mold portion and a blow mold portion and a second mold part having a core pin. The core pin is configured to cooperate with the injection mold portion in a first position to define an injection mold cavity for forming a preform and an integral cap. The core pin is also configured to cooperate with the blow mold portion in a second position to define a blow mold cavity for forming a receptacle from the preform. The cap may be closed at the blow mold portion to seal the receptacle. One or more threads may be formed on a neck of the container.

Abstract: Stack mold transfer device are disclosed that include first and second transfer members having respective first and second transfer channels, first and second valve seats, and first and second valve members. The first valve member defining a flow portion and a first sealing surface and the second valve member defining a second sealing surface and a receiving pocket. When the first and second transfer members are in an engaged configuration, the first and second transfer channels form a common transfer channel. When the transfer device is in a closed-flow configuration, the flow of molding material is blocked, and when the transfer device is in an open-flow configuration, the first sealing surface of the first valve member is slidably received in the receiving pocket of the second valve member and the flow portion of the first valve member is positioned to allow molding material flow within the common transfer channel.

Abstract: A container treatment plant having an oven, a blow molder located downstream of the oven and used for processing a plurality of container blanks, such as preforms, and a conveying unit configured for conveying a plurality of carriers, each carrier being provided for accommodating at least one container blank, and the conveying unit and the carrier being adapted to one another such that each carrier is individually movable through the oven.

Abstract: A hot runner apparatus for a mold assembly of an injection molding machine includes a hot runner plate assembly having a first end portion and a second end portion and a machine axis extending therebetween. At least one insert coupling having an axial bore is secured to the first end portion of the hot runner plate assembly, for separable sealed engagement with a gate insert affixed to a cold half of the mold assembly. The insert coupling includes a coupling interface for contacting a mating interface of the gate insert in sealed contact during an injection cycle of the injection molding machine. The coupling interface includes a primary side surface that is inclined relative to the machine axis.

Abstract: The invention relates to an installation and a method of producing hollow bodies by injection molding and subsequent blow molding. The installation comprises an injection molding tool with at least one cavity for producing a preform with a neck continuation and a hollow body part adjoining the neck continuation, a blow mold for shaping the hollow body from the preform and transfer means for transporting the preform from the injection molding tool to the blow mold. The transfer means comprises a carrying frame in which at least one holding element for the at least one preform is disposed. When transferring the preform from the opened injection molding tool to the transfer means, the preform is held on the outside of its neck continuation by a tool part of the injection molding tool and is thereby removed from the cavity. The preform is then placed with the inside of its neck continuation into the holding element, such that the holding element bears against an inner surface of the neck continuation.

Abstract: Heating device for preforms, capable of accurate and highly localized heating of the preforms before the blow molding step of the process of producing bottles or containers from plastic materials. This device comprises two or more heating modules (11-16), each comprising a through opening (100) in the direction of the thickness of the heating module and a heating element (5) positioned in the vicinity of the through opening. The modules (11-16) are assembled such that the through openings (100) are aligned reciprocally with each other to define a conditioning cavity for the heating device (1). Each heating module (11-16) comprises induction means (2).

Abstract: An injection blow molding (IBM) system and method for forming a plurality of parisons and molded articles. The IBM system includes an injection station having upper and lower die sets and a plurality of upper and lower mold half blocks each attached to a respective die set. Each of the upper mold half blocks has a corresponding lower mold half block with which it cooperatively defines one or more cavities for forming the exterior shape of the body of one or more of the parisons. The individual, independent attachment of the mold half blocks to the die sets allows easy individual replacement of faulty or worn mold blocks. Further, such an independent attachment configuration also permits the mold half blocks of each die set to be spaced from one another, so as to reduce thermal expansion problems and ease dimensional tolerances required for the width of the mold half blocks.

Abstract: A cavity insert for a mold stack is disclosed, the cavity insert being dimensioned to define a continuous annular cavity insert cooling chamber. The cavity insert also provides a first and second decompression chamber in fluid communication with each end of the cavity insert cooling chamber. Also disclosed is a chamber extension feature in fluid communication with the cavity insert cooling chamber to promote cooling in the downstream region of the cavity insert.

Abstract: A blow mold unit includes a first and a second blow cavity split mold, and a plurality of raised-bottom molds. The blow mold unit also includes a first and a second securing plates on which the first and the second blow cavity split mold are secured, a plurality of first pressure-receiving plates respectively secured on the first and the second securing plates, a third securing plate disposed between the first and the second securing plates, the plurality of raised-bottom molds secured on the third securing plate, a plurality of shafts suspended from the third securing plate, and a plurality of second pressure-receiving plates secured on the first and the second securing plates at a position below the third securing plate.

Abstract: Machine for forming containers made of thermoplastic material by blow-moulding preforms obtained by means of injection/moulding within the machine, for which at least one longitudinal direction for feeding of the preforms between the stations thereof is defined, said machine including: an injection unit provided with a longitudinal injector; a station for moulding the preforms, comprising a mould with a predefined number of cavities for injection/moulding of preforms; a station for blowing the preforms, comprising a blowing assembly for forming finished containers; said blowing assembly comprising a smaller number of blowing cavities than the number of injection/moulding cavities in the mould and being displaceable in both senses of the longitudinal direction on fixed longitudinal guides.

Abstract: A blow mold unit including a blow mold including first and second blow cavity split molds and a plurality of raised bottom molds, first and second pressure receiving plates, a first fixing plate to which the first blow cavity split mold and the first pressure receiving plate are fixed, a second fixing plate to which the second blow cavity split mold and the second pressure receiving plate are fixed, a third fixing plate interposed between the first and second fixing plates and to which the plurality of raised bottom molds are fixed at a first surface thereof, a shaft portion extending vertically from a second surface of the third fixing plate, an elevation guide block fixed to one of the first and second fixing plates and elevation guiding the shaft portion, and an elevating rod extending vertically from the second surface. There is also a blow molding machine which includes the blow mold unit.

Abstract: A method that enables a thermoplastic pipe in a partial or complete bellows-form, preferably having connecting elements such as clip, bracket, etc. thereon to be manufactured in a single process.

Abstract: A mold apparatus, an injection molding apparatus, and an injection molding method, which can satisfactorily form a preform having a bottom thicker than a body, are provided. The mold apparatus comprises a neck mold, an injection cavity mold, and an injection core mold having an inside core mold and an outside core mold, and further comprises a regulation means, such as an urging member, for regulating the movement of the inside core mold toward the outside of the injection cavity mold.

Abstract: A system for producing blow molded articles. The system includes an injector nozzle mounted to a parison cavity block having a parison cavity such that the injector nozzle injects molten plastic into the parison cavity to form a parison. The injector nozzle is mounted to the parison block by means of two seats, a distal seat where the distal end of the injector nozzle is seated within an opening in the parison cavity block and a proximal seat, a linear distance inwardly from the distal seat, where a circular flange on the injector nozzle is seated within an annular shelf formed in the parison block. The two spaced apart seats ensure an accurate alignment between the centerline of the injector nozzle and the parison cavity. As a further feature, there is a system to heat the nozzle tip to reduce the temperature differential between the nozzle and the parison cavity.

Abstract: Plastic container manufacturing plant comprising devices for injection-compression of plastic in molds and effected by means of at least one rotary carousel actuated by electro-pneumatic actuators, of the single-stage type integrating at least one first rotary carousel (2) for molding of the preforms and a second rotary carousel (7) for stretch blow molding of the preforms. Moreover, the plant comprises a transport system (5) between said first (2) and second rotary carousel (7) comprising further handling wheels, of which at least one (8) comprises means for thermal conditioning of the preforms.

Abstract: A system for injection molding a part includes a plate, first and second primary mold slides, first and second secondary mold slides and at least a first core post. The first and second primary mold slides define an exterior of a first portion of a molded part and are movable relative to each other between an open position and a closed position. The first and second secondary mold slides define an exterior of a second portion of the molded part and are movable relative to each other between an open position and a closed position. A first core post defines an interior of the first portion of the molded part. The first and second secondary mold slides are operative to secure the molded part as the first and second primary mold slides are moved from their closed position to their open position, as the molded part is expanded under a source of pressurized air and as the first core post is withdrawn from an interior of the molded part.

Abstract: A device and a method for manufacturing plastic containers, where a preform is manufactured in a casting mold and finished in a blow mold, and to ensure a constructively simple realization and an improved temperature control, the casting mold and the blow mold are lined up to form a mold complex.

Abstract: The injection stretch blow molding device includes an injection molding section that produces N (N is an integer equal to or larger 2) preforms by injection molding, a cooling section that subjects the N preforms transferred from the injection molding section to forced cooling, a heating section that continuously transfers and heats the N cooled preforms, and a blow molding section that subjects the N heated preforms to stretch blow molding in n (n is an integer equal to or larger than 2) operations, the blow molding section simultaneously stretch blow molding M (M=N/n, M is a natural number) preforms among the N preforms into M containers.

Abstract: An injection molding system is disclosed that includes a mold insert set and a shaft locking assembly that releasably attaches the mold insert set to a mold plate of the injection molding system. Each mold insert of the mold insert set defines at least a portion of a mold cavity. The shaft locking assembly is displaceable between a locked position in which the mold insert set is held to the mold plate and an unlocked position in which the mold insert set is removable from the mold plate.

Abstract: An injection moulding apparatus includes an openable mould (1, 3) having a plurality of cavities for injection moulding articles (6), and, disposed below the mould cavities, a plurality of post cooling cavities (13) into which in use released injection moulded articles (6) may pass at least partially under gravity when released from the mould cavities.

Abstract: An apparatus and method for the production of bi-material hollow bodies by injection overmolding. The apparatus includes: n base molding cavities or groups of base molding cavities inserted between n+1 overmolding cavities or groups of overmolding cavities or vice versa; and 2n cores or groups of cores which are fixed to a core holder plate mounted such that it can move in a transverse direction on a base plate that is actuated to move in a longitudinal direction in order alternately to insert each core into one of the base molding cavities, so as to mold a first layer, and into one of the overmolding cavities, so as to overmold a second layer. The apparatus also includes an ejecting device for ejecting the finished bi-material hollow bodies and a valve for alternately distributing the molding material to one or the other of the outer cavities.

Abstract: A method of making a container includes the step of providing a preform having a body defining an interior cavity. The body has an end portion and an end feature protruding from the end portion. The preform is placed into a mold. The mold has a mold cavity for receiving the preform body and a feature cavity for receiving the end feature. A stretch rod is inserted into the interior cavity of the preform to a position adjacent the end feature, whereby the stretch rod will retain the end feature in the feature cavity. The preform is blow molded into a finished product. The stretch rod retains the end feature in the feature cavity during the blow molding step.

Abstract: In an embodiment, a neck mold assembly includes N rows of holding plates, each of the N rows of holding plates holding a plurality of neck molds. The neck mold assembly also includes a supporting-mechanism that supports the N rows of holding plates. The supporting mechanism includes at least one reinforcement shaft that is provided along a row direction of the N rows of holding plates, and two first securing sections that are secured at either end of the at least one reinforcement shaft. Each of the N rows of holding plates has at least one first through-hole that receives the at least one reinforcement shaft.

Abstract: A blow mold unit includes a first and a second blow cavity split mold, and a plurality of raised-bottom molds. The blow mold unit also includes a first and a second securing plates on which the first and the second blow cavity split mold are secured, a plurality of first pressure-receiving plates respectively secured on the first and the second securing plates, a third securing plate disposed between the first and the second securing plates, the plurality of raised-bottom molds secured on the third securing plate, a plurality of shafts suspended from the third securing plate, and a plurality of second pressure-receiving plates secured on the first and the second securing plates at a position below the third securing plate.

Abstract: An injection blow molding (IBM) system and method for forming a plurality of parisons and molded articles. The IBM system includes an injection station having two die sets, two body mold halves, and two neck mold halves. Each of the neck mold halves is attached directly to one of the die sets. The neck mold halves are configured to cooperatively form the exterior shape of the necks of one or more parisons. This type of neck mold attachment configuration can allow for better temperature control of the neck portion of the parison being molded therein. Further, such a neck mold configuration can reduce the cost of fabricating, installing, and/or replacing the neck molds.

Abstract: According to embodiments of the present invention, there is provided a cavity insert for a molding system, the cavity insert having a deformable portion. More specifically, A cavity insert (106) is provided, the cavity insert (106) is for a molding stack (102) for use in an injection mold, the cavity insert (106). The cavity insert (106) comprises a body (122) configured to be received, in use, within a cavity plate (104) of the injection mold; the body (122) defining: a cavity molding surface (124) along an inner portion thereof; a circumferentially deformable portion (123); and an actuator interface (134) configured to cooperate, in use, with a complementary actuating interface (136) that is defined on a compression member (138) to generate a compressive force that selectively elastically deforms the circumferentially deformable portion (123).

Abstract: An injection blow molding (IBM) system and method for forming a plurality of parisons and molded articles. The IBM system includes an injection station having two die sets and a plurality of first and second body mold halves each attached to a respective die set. Each of the first body mold halves has a corresponding second body mold half with which it cooperatively defines a cavity for forming the exterior shape of the body of one of the parisons. The individual, independent attachment of the body mold halves to the die sets allows easy individual replacement of faulty or worn molds. Further, such an attachment configuration also permits the body mold halves connected to a common die set to be spaced from one another, so as to reduce thermal expansion problems and ease dimensional tolerances required for the width of the body mold halves.

Abstract: An injection blow molding (IBM) system and method for controlling the surface temperature of the parison molds by passing heat transfer fluid through a plurality of fluidly-coupled heat transfer channels. The heat transfer channels can be formed primarily in die sets to which the parison molds are attached. The placement and distribution of the heat transfer channels relative to the parison-forming surfaces helps control the temperatures of the bodies and necks of the parisons being formed, instead of relying on various adjustments by an IBM operator. This system/method reduces the discretion required by the IBM operator and shifts the burden of consistently making high-quality parisons and molded articles onto the designer of the IBM tooling.

Abstract: An injection blow molding (IBM) system and method for forming a plurality of parisons and molded articles. The IBM system includes an injection station having two die sets and two mold half assemblies. Each of the mold assemblies is attached to one of the die sets. The mold half assemblies are configured to cooperatively form the exterior shape of the necks of a plurality of parisons. Heat transfer channels formed in both the die sets and the mold half assemblies are fluidly connected with each other, such that a heat transfer fluid can be routed to the mold half assemblies via the die sets.

Abstract: A molding system is disclosed that includes a plurality of cavity portions or core block assemblies attached to a mold plate and a plurality of core portion or core block assemblies attached to a second mold plate, and a plurality of stripper rings or thread split-slide assemblies attached to a stripper plate assembly. The stripper plate assembly includes a main stripper plate with one or more stripper plate panels coupled thereto that are translatable away from the main stripper plate during installation of at least the core portions or core block assemblies. The one or more stripper plate panels may be translatable to fold, outwardly swing, and/or slide relative to the main stripper plate to clear any core portions or core block assemblies that may have been previously installed.

Abstract: Plastic container manufacturing plant comprising devices for injection-compression of plastic in moulds and effected by means of at least one rotary carousel actuated by electro-pneumatic actuators, of the single-stage type integrating at least one first rotary carousel (2) for moulding of the preforms and a second rotary carousel (7) for stretch blow moulding of the preforms. Moreover, the plant comprises a transport system (5) between said first (2) and second rotary carousel (7) comprising further handling wheels, of which at least one (8) comprises means for thermal conditioning of the preforms.

Abstract: To provide a preform, a bottle and a preform molding apparatus capable of preventing lowering in the mechanical strength of a preform, reducing the amount of a resin material, as well as improving productivity. A preform mold 1e used in the preform molding apparatus has a mouth neck part mold 2, a body part mold 3e and a core mold 163, and the body part mold 3e has, on the outer edge of the upper surface of a cylindrical protrusion part 31e, an annular protrusion 33 which controls the moving direction of a solidified film 118 and a solidified film 117 which have been peeled.

Abstract: In a pressure vessel which is formed by blow molding a plastic liner with a mouth member fitted on a blow pin, a rotational torque is prevented from being applied between the mouth member and the blow pin when removing the blow pin. A parison is placed around the mouth member which is fitted on the blow pin, and is blow molded with a die assembly placed around the parison so that a vessel shaped plastic liner is formed. An engagement structure which is provided between the mouth member of the pressure vessel and the blow pin includes a ball moveably received in a radial through hole of the peripheral wall of the blow pin, and a release groove formed on an inner circumferential surface of the mouth member and having a prescribed depth. When the blow pin is introduced into the mouth member until the ball and the release groove oppose each other, the ball moves radially outward and becomes partly received by the release groove to engage the mouth member with the blow pin.

Abstract: A blow molding apparatus includes an injection molding station (12) that injection-molds preforms (1A) held by N (N is an integer equal to or larger than 2) rows of holding plates (30), a temperature control station (14) that performs a temperature control operation on the preforms (1A), a blow molding station (16) that blow-molds the preforms into containers, and a row pitch change section (130) that changes the row pitch of the N rows of holding plates so that P1<P3<P2 is satisfied, P1 being the row pitch of the N rows of holding plates when they hold the performs, P2 being the row pitch of the N rows of holding plates when they hold the containers, and P3 being the row pitch of the N rows of holding plates when they hold the preforms that are transferred to N rows of blow molds that are opened.

Abstract: A device for producing a tubular object from thermoplastic material includes a die, a plunger, and a withdrawal unit. The movements of the withdrawal unit, plunger and die body are controlled such that the movement of the withdrawal unit is carried out according to a freely adjustable velocity profile over the path of the withdrawal unit. Movement of the plunger is carried out according to a freely adjustable velocity profile over the plunger path and movement of the die body is carried out according to a freely adjustable position profile over the path of the withdrawal unit or plunger. In this manner, the wall thickness of the tubular object may be adjusted with high accuracy over its length.

Abstract: An apparatus for shaping plastics material pre-forms into containers has a plurality of blow moulding stations arranged on a movable carrier blow moulding stations have two part blow moulds with a cavity inside in which the plastics material pre-forms are expanded. The blow moulding stations have stressing devices which act upon the plastics material pre-forms to expand them with a flowable medium. At least one first bearing device is provided for movable mounting of the blow mould carriers with respect to each other and at least one second bearing device is provided for movable mounting of the first locking element with respect to the second locking element. At least one of these bearing devices is a slide bearing without lubricant or a bearing which is injection moulded at least in part from a plastics material between bearing parts movable relative to each other.

Abstract: A blow molding apparatus includes an injection molding station (12) that injection-molds preforms (1A) held by N (N is an integer equal to or larger than 2) rows of holding plates (30), a temperature control station (14) that performs a temperature control operation on the preforms (1A), a blow molding station (16) that blow-molds the preforms into containers, and a row pitch change section (130) that changes the row pitch of the N rows of holding plates so that P1<P3<P2 is satisfied, P1 being the row pitch of the N rows of holding plates when they hold the performs, P2 being the row pitch of the N rows of holding plates when they hold the containers, and P3 being the row pitch of the N rows of holding plates when they hold the preforms that are transferred to N rows of blow molds that are opened.

Abstract: An injection blow molding (IBM) system and method for forming a plurality of parisons and molded articles. The IBM system includes an injection station having two die sets and a plurality of first and second body mold halves each attached to a respective die set. Each of the first body mold halves has a corresponding second body mold half with which it cooperatively defines a cavity for forming the exterior shape of the body of one of the parisons. The individual, independent attachment of the body mold halves to the die sets allows easy individual replacement of faulty or worn molds. Further, such an attachment configuration also permits the body mold halves connected to a common die set to be spaced from one another, so as to reduce thermal expansion problems and ease dimensional tolerances required for the width of the body mold halves.

Abstract: A bottom insert for a mold cavity for the production of moldings of plastic material. The mold cavity has a main body with a hot side which has a recess for receiving molten plastic material under pressure and a cold side having a recess, the inside contour of which is intended to come into contact with the molding to be produced and to shape the outside contour thereof. A gate (17) is provided that connects the recess of the hot side to the recess of the cold side and is intended to introduce molten plastic material from the hot side into the cold side. In accordance with the invention there is provided a device for thermal insulation within the bottom insert between the hot side and the cold side of the bottom insert to permit more rapid cooling of the cold side by restricting heat flow from the hot side.

Abstract: Method and apparatus for controlling the delivery of polymer material in a sequential injection molding process. In one embodiment, the method provides: delivering a first shot of a first material simultaneously to a plurality of mold cavities; independently sensing for each cavity a property that is indicative of a volume or flow of material that is delivered to the corresponding cavity during the step of delivering the first shot; independently stopping the step of delivering the first shot to one or more cavities according to a program that uses as a variable a signal indicative of the property sensed for the corresponding cavity during delivery of the first shot; and delivering a second shot of a second material simultaneously to the cavities subsequent to the step of stopping the step of delivering the first shot.

Abstract: The invention concerns an injecting/blowing device comprising at least one mold for injecting a thin-walled hollow preform capable of being transformed into a more voluminous hollow body by blowing, said mold including a counter mold defining the inner surface of the cavity, a cure located in the cavity and spaced apart from said inner surface, a preform impression located between the counter mold inner surface and the core, and which will receive the melt, at least two main preferential flow channels (CEP) optionally at least two secondary preferential flow channels (CEP), each CEP being delimited by at least one recessed zone at the surface of the core and the inner surface of the cavity.