摘要:
A method of the selection, modification of existing, and/or creation of polyester based polymer materials, which provide improved response to the application of local shear and/or extensional deformation inside the polyester based polymer melt in injection stretch blow molding, is disclosed. A method for manufacturing a polymer article is also provided including injecting a molten polyester based polymer in a preform mold for converting it in a preform while applying shear and/or extensional deformation on the polyester based polymer melt. Applying shear and/or extensional deformation on the polyester based polymer melt includes modifying the flow path of the molten polymer as a function of local pressure profile over at least part of the flow path. The local pressure profile is determined as a function of optimized response of the polyester based polymer melt to the applied local shear and/or extensional deformation over at least said part of the flow path.
摘要:
The present disclosure provides a method for preparing an injection-molded fiber-reinforced composite article using a molding machine controlled by a controlling module connected to the molding machine. The method performs a molding simulation executed on the controlling module to generate a shear rate distribution of the composite molding resin in a simulating domain. Subsequently, the method generates an orientation distribution of the fibers in the composite molding resin executed on the controlling module by taking into consideration an effect of the shear rate on an inter-fiber interaction and/or an effect of the shear rate on reducing a response rate of the fibers. A controller then controls the molding machine with the molding condition to perform an actual molding for injecting the composite molding resin into at least a portion of the mold cavity.
摘要:
An injection blow molding method for making a container having the steps of injecting a molten crystallizable polymer in a preform mold via a hot runner system and biaxially stretching the preform by blowing to form a container. The method further having the step to selectively modify the flow path of the molten crystallizable polymer within the hot runner system.
摘要:
Mold (20) for manufacturing plastic products provided with a bottom and a sidewall, wherein the mold comprises at least a first (21) and second (22) mold part which jointly define at least partly at least one mold cavity (100) and are movable in a first direction, wherein the at least one mold cavity comprises at least one first, in particular bottom-forming part (101) and one second (102), in particular sidewall-forming part, wherein on the first mold part at least one fixed wall part (24) is provided which supports a first movable wall part (20) which is movable relative to the respective fixed wall part (24) in at least a second direction which includes an angle with the first direction, wherein in said first movable wall part a second movable wall part (35) is provided, on the side facing the mold cavity, which is movable between a forwardly moved position and a retracted position relative to the first movable wall part.
摘要:
Mold (20), provided with a mold cavity which is at least partly defined by a movable wall part (50), wherein injection means (34) are provided for introducing material into the mold cavity, which injection means comprise at least one injection opening (34A) which is provided in at least one stationary wall part (80) of the mold cavity, wherein said stationary wall part (80) is at least partly surrounded by said at least one movable wall part (50).
摘要:
An apparatus for manufacturing products from material which is thermoplastically deformable, as from plastic, comprising:—a mold (2) with at least one mold cavity (3);—in the or each mold cavity (3) at least one slide (8);—movement means for moving each slide (8);—closing means for opening and closing the mold (2);—feed means for introducing, with the mold cavity (3) closed, said material in at least substantially plastic condition into the or each mold cavity; wherein the movement means (9) for moving the slide (3) are arranged for moving said slide forward at a relatively high speed relative to the movement speed of the mold parts upon opening and closing thereof, from a position at least partly retracted from the mold cavity, such that said material, as a result, is displaced in the mold cavity for obtaining the filling thereof, preferably at a speed high such that adiabatic heat development occurs in the or each mold cavity.
摘要:
In a method for producing a bristle from thermoplastic polymers through injection molding, the molten polymer mass is injected under pressure into a bristle-molding channel of predetermined length having a predetermined cross-section along this length and the channel is vented during injection molding. To produce injection-molded bristles with excellent bending behavior, the magnitude of the injection pressure is adjusted in dependence on the cross-sectional extension of the bristle-molding channel such that a shear flow is generated with high core speed in the center of the molten polymer mass flow and large shearing effect due to wall friction of the molten polymer mass under distinct longitudinal orientation of the polymer molecules at least in the region of the molten polymer mass close to the wall, which is maintained along the channel wherein the channel is simultaneously vented along its length to support maintenance of the shear flow. A device for carrying out the method is also described.
摘要:
A plastic article having a sharp point is made of a polymer of high impact strength and high hardness. The article may be a lancet or a needle for skin puncture, suturing or sewing. A method for preparing the article includes shear thinning a melt of a polymer and introducing the shear thinned melt into a mold which includes a sharp point.
摘要:
An injection molding machine for processing plastics wherein the plastic mass for the injection operation is propelled by means of a packer piston through a shearing gap between the inner wall of an injection cylinder and a rotatably driven plasticizing head into a displacement compartment of the injection cylinder and thus plasticized. The plasticizing head is arranged at a shaft piercingly extending through the packer piston and the packer piston is displaceable up to the region of the plasticizing head. The plasticizing head possesses a greater diameter than the packer piston, and the end surface of a packing cylinder which houses the packer piston and confronting the plasticizing head and the face of the plasticizing head confronting the packing cylinder possesses a further gap arranged ahead of the shearing gap and which can be closed by axial displacement of the plasticizing head or the packer piston.