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Cavity insert and method for producing product using cavity insert

A cavity and insert technology, which is applied in the field of polymer molding processing, can solve the problems of single macroscopic shape and structure, achieve remarkable shear flow effects, wide range, and improve the efficiency of production experiments

Active Publication Date: 2019-05-10
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the single secondary melt penetrates the M of the primary melt 3 IM products have only one interaction interface between melts. When the interaction between the two melts is weak, the influence of the constraint interface on the two melts will be greatly limited, and the single secondary melt penetrates the primary melt. The macroscopic morphological structure of the body is relatively simple, which will have great limitations on the later shaping and functionalization

Method used

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  • Cavity insert and method for producing product using cavity insert
  • Cavity insert and method for producing product using cavity insert
  • Cavity insert and method for producing product using cavity insert

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A cavity insert, including an insert body 1, a primary melt injection cold runner 3, a secondary melt multi-strand injection mechanism, a drainage channel 8 and a secondary cavity 9, a cavity 2 is opened in the main body, and the Both the primary melt injection cold runner 3 and the secondary melt multi-strand injection mechanism are connected to one end of the cavity 2 , and the auxiliary cavity 9 is connected to the other end of the cavity 2 through a flow guide 8 .

[0036] In this embodiment, the secondary melt multi-strand injection mechanism includes a secondary melt injection cold main channel 5 and a plurality of branch channels 6 . Among them, the number of runners 6 is preferably 4, one end of the four runners 6 is connected to the secondary melt injection cold main channel 5, and the other end of the four runners 6 is connected to the cavity 2 to ensure smooth flow of the melt. Enter. The primary melt injection cold runner 3 is completely parallel to the flo...

Embodiment 2

[0045] A cavity insert, including an insert body 1, a primary melt injection cold runner 3, a secondary melt multi-strand injection mechanism, a drainage channel 8 and a secondary cavity 9, a cavity 2 is opened in the main body, and the Both the primary melt injection cold runner 3 and the secondary melt multi-strand injection mechanism are connected to one end of the cavity 2 , and the auxiliary cavity 9 is connected to the other end of the cavity 2 through a flow guide 8 .

[0046] In this embodiment, the secondary melt multi-strand injection mechanism includes a secondary melt injection cold main channel 5 and a plurality of branch channels 6 . Wherein, the number of runners 6 is preferably 2, and one end of the two runners 6 is connected to the secondary melt injection cold main channel 5, and the other end of the two runners 6 is connected to the cavity 2 to ensure smooth flow of the melt. Enter.

Embodiment 3

[0048] On the basis of Example 1 or Example 2, this implementation also provides a method for preparing a product using a cavity insert, including the following steps:

[0049] (1) The isotactic polypropylene (iPP) with the brand name T30S is used as a primary melt. After being melted and plasticized into a melt at 190°C by the primary melt injection unit, the injection pressure is 1000 Bar through the nozzle of the primary injection unit. The primary melt is injected into the cavity 2 with a temperature of 80°C at an injection speed of 35ccm / s to form a short-shot melt;

[0050] (2) Within 3s after the first melt injection, the high-density polyethylene (HDPE) with the grade of 6098 is used as the secondary melt, and after the secondary injection unit is melted and plasticized into a melt at 200 ° C, it is injected via the secondary injection Under the injection pressure of 1500Bar, the unit nozzle injects multiple strands of secondary melt at the same time at an injection sp...

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Abstract

The invention discloses a cavity insert, which comprises an insert body, a primary melt injection cold runner, a secondary melt multi-strand injection mechanism, a drainage channel and a secondary cavity, the primary melt injection cold runner and the secondary melt injection The stock injection mechanism is connected to one end of the cavity, and the auxiliary cavity is connected to the other end of the cavity. Also disclosed is a method for preparing a product, specifically: (1) under the injection pressure of 1000-1850 Bar, injecting a primary melt into a cavity with a temperature of 80-100°C at an injection speed of 25-35 ccm / s; (2) ) Under the injection pressure of 1500~2299Bar, inject multiple secondary melts into the cavity at the same time at an injection speed of 15~38.4 ccm / s, and the multiple secondary melts push the primary melt to fill the cavity and penetrate the cavity. The melt enters the secondary cavity through the drainage channel; (3) the finished product is obtained after cooling, maintaining pressure and setting. The present invention enables secondary melts with different strands to penetrate the primary melt independently and stably.

Description

technical field [0001] The invention relates to mold cavity inserts for injection molding of two identical or different polymers, which can realize the independent and stable penetration of multiple strands of secondary melt into the primary melt and final molding, and also relates to a method using the The invention relates to a method for preparing products with cavity inserts, which belongs to the field of polymer molding processing. Background technique [0002] Multi-melt Multi-Injection Molding (Multi-Melt Multi-Injection Molding, M 3 IM) is a new type of polymer injection processing method developed from Conventional Injection Molding (CIM), which is currently widely used and researched. It belongs to Multi-Fluid Multi-Injection Molding A kind of Molding, MFMIM), the molding process mainly includes a short shot of the melt to half-fill the cavity, and the second melt injection pushes the primary melt to fill the cavity and penetrate the primary melt when the primary ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C45/26B29C45/27B29C45/16B29C45/77B29C45/78
CPCB29C45/1615B29C45/2602B29C45/2708B29C45/2756B29C45/77B29C45/78B29C2045/2709B29C2945/76498B29C2945/76531B29C2945/76551B29C2945/76595B29C2945/76859
Inventor 杨鸣波黄炎昊刘正英杨伟朱春霞陈瑞
Owner SICHUAN UNIV