PET plastic preform body injection mold and method of use

Abstract

The invention belongs to the technical field of injection molds, and specifically is a PET plastic preform body injection mold and a method of use. The mold comprises a base, a hydraulic press and a heat flow tube, wherein the upper surface of the base is installed with a limit plate through bolts; a first groove is opened on one side of the base close to the limit plate; lower templates evenly distributed are installed in the first groove through clamping grooves and clamping blocks; the lower templates are of rectangular parallelepiped structure design; a mold cavity is provided on one sideof the lower templates close to the limit plate; and the mold cavity penetrates the limit plate and is provided extending to the outside. The PET plastic preform body injection mold moves a movable plate and a pressure plate up and down, so that a first mold core and a second mold core in a rotating groove provided on the movable plate rotates, the first mold core, the second mold core and the mold cavity are alternately combined for injection molding, and a double-layer PET plastic preform is prepared. The injection molding of an inner embryo body directly carried out inside the solidified outer embryo body effectively solves the problem of dimensional discrepancy in step injection molding.

Description

technical field [0001] The invention belongs to the technical field of injection moulds, in particular to an injection mold for a PET plastic bottle embryo and a method for using it. Background technique [0002] In the prior art, when the PET double-layer plastic preform is manufactured, the inner layer and the outer layer are usually manufactured separately, and then the inner layer and the outer layer are assembled. This manufacturing method is not only low in efficiency, but also takes a long time to manufacture. , At the same time, during the manufacturing process of plastic preforms, it is easy to cause conflicts in the dimensions of the inner layer and the outer layer due to reasons such as cooling rate, which leads to the failure of assembly. [0003] An injection mold for a two-color bottle and its manufacturing process issued by a Chinese patent, patent number: 2015100677562, includes a primary mold and a secondary mold, the primary mold is used to manufacture the ...

AI Technical Summary

Problems solved by technology

[0005] In order to make up for the deficiencies of the prior art, and solve the problems that the manufacturing process of the double-layer PET plastic bottle preform in the prior art is cumbersome and the manufacturing precision is not high, and the bonding degree between the two layers of preforms is not good, a method proposed by the present invention A kind of PET plastic preform body injection mold and using method

[0007] In the prior art, when the PET double-layer plastic preform is manufactured, the inner layer and the outer layer are usually manufactured separately, and then the inner layer and the outer layer are assembled. This manufacturing method is not only low in efficiency, but also takes a long time to manufacture. , At the same time, during the manufacturing process of the plastic preform, it is easy to cause the size conflict between the inner layer and the outer layer due to the cooling rate and other reasons, and then the assembly cannot be carried out. When working, install it symmetrically into the first groove and the second groove After the upper template and the lower template are assembled, the hydraulic press is started, and the hydraulic press drives the pressure plate to move downward, and then the movable plate connected to the pressure plate through the spring elastically slides downward under the action of gravity, and as the movable plate and the pressure plate continue to Move down, the mounting plate and the limit plate are gradually fitted together, the first mold core in the rotating groove of the upper mold is inserted into the mold cavity opened on the surface of the lower mold plate, and the PET plastic fluid is delivered to the first mold through the injection hole through the heat flow tube. In the cavity formed between the core and the cavity, and after the PET plastic is conveyed, the cooling gas is passed into the cooling tank to cool and shape the plastic in the cavity formed by the first core and the cavity. Afterwards, the output end of the hydraulic press is controlled to rise. At this time, due to gravity, the moving plate has a tendency to move downward, and the pressure plate moves upward, thereby causing a relative displacement between the tooth plate on the pressure plate and the one-way wheel in the reversing groove, and then Through the meshing transmission between the belt pulley and the transmission wheel, the first mold core rotates in the rotation groove. Since the first mold core is in the mold cavity at this time, the first mold core cannot rotate, resulting in the gap between the tooth plate and the one-way wheel. At this time, the pressure plate drives the moving plate to move upward synchronously. When the first mold core is separated from the cavity, there is a displacement between the tooth plate and the one-way wheel. The first mold core and the connecting block rotate in the rotating groove. When the moving height difference between the pressure plate and the moving plate is reached, they move upward synchronously under the action of the spring. At this time, the second mold core and the first mold core in the rotating groove exchange positions, and then move down, overlap, injection molding, After cooling, the double-layer PET plastic preform can be obtained. Through the up and down movement of the moving plate and the pressure plate, the first mold core and the second mold core in the rotating groove opened on the moving plate are rotated, and then the first mold core is rotated. core and the second mold core and the mold cavity are alternately combined with injection molding to obtain a double-layer PET plastic bottle. Injection molding effectively solves the problem of size incompatibility during step-by-step injection molding, and can also effectively speed up production efficiency, and the continuous injection molding method can also effectively avoid impurity pollution and deformation of the preform during manual transfer. The manufacturing process is relatively simple

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