Secondary mold opening device for micro-pore injection-molding-foaming and in-mold-decoration composite molding and technology

A technology of in-mold decoration and injection molding foaming, applied in the direction of coating, etc., can solve the problems of limiting product output and extrusion flow rate, not suitable for industrial production, complicated process, etc., to improve nucleation efficiency, improve Cell nucleation issues, effect of reduced process steps

Inactive Publication Date: 2017-11-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the intermittent foaming process, the polymer is first made into the shape of the product, and then foamed, but because the process is more complicated and the cycle is longer

Method used

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  • Secondary mold opening device for micro-pore injection-molding-foaming and in-mold-decoration composite molding and technology
  • Secondary mold opening device for micro-pore injection-molding-foaming and in-mold-decoration composite molding and technology
  • Secondary mold opening device for micro-pore injection-molding-foaming and in-mold-decoration composite molding and technology

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0033] Embodiment one

[0034] The dimensions of the part to be made: 40mm in length, 30mm in width, and 20mm in thickness. The foaming device used refers to figure 2 The secondary mold opening device shown includes a film for in-mold decoration, a cavity for injection molding, and a concave mold. The concave mold can move backward at a rate of 10mm / s, and the film used is a 0.3mm polyurethane film , and fit tightly to the inner wall of the die. like figure 1 As shown, its manufacturing process includes the following steps:

[0035] S1) Film sticking and mold closing: cut the film into the same shape as the outer surface of the part, and stick it on the inner wall of the die, and then close the mold. The size of the mold cavity after mold closing is 40mm long, 30mm wide, and 30mm thick. 15mm;

[0036] S2) Form a homogeneous system: add polypropylene pellets to the hopper of the injection molding machine, then heat and plasticize, and inject supercritical carbon dioxide g...

Example Embodiment

[0040] Embodiment two

[0041] The part to be made is a disc with a diameter of 30mm and a thickness of 10mm. The manufacturing process includes the following steps:

[0042] S1) Cut the polyurethane film into the same shape as the outer surface of the part, and stick it on the inner wall of the die, and then close the mold. The size of the mold cavity after the mold closing is 30mm in diameter and 5mm in thickness;

[0043] S2) Add polyethylene pellets to the hopper of the injection molding machine, then heat and plasticize, and inject supercritical nitrogen as a foaming agent at the same time, and form a homogeneous mixture of supercritical nitrogen and polyethylene melt under the stirring and shearing action of the screw. phase system;

[0044]S3) injecting the homogeneous system of supercritical fluid nitrogen and polyethylene through the mold gate into the mold cavity, and after the filling is completed, continue to inject the polymer melt to keep the pressure;

[0045]...

Example Embodiment

[0047] Embodiment three

[0048] The part to be made is a disc with a diameter of 30 mm and a thickness of 10 mm. Its manufacturing process includes the following steps:

[0049] S1) Cut the polyethylene terephthalate film into the same shape as the outer surface of the part, and stick it on the inner wall of the die, and then close the mold. The size of the cavity after mold closing is 30mm in diameter and 30mm in thickness. 5mm;

[0050] S2) Add polypropylene pellets to the hopper of the injection molding machine, heat and plasticize, inject supercritical nitrogen as a foaming agent at the same time, and form a homogeneous mixture of supercritical nitrogen and polypropylene melt under the stirring and shearing action of the screw. phase system;

[0051] S3) injecting the homogeneous system of supercritical fluid nitrogen and polypropylene through the mold gate into the mold cavity, and after filling is completed, continue to inject the polymer melt to maintain pressure; ...

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Abstract

The invention discloses a secondary mold opening device for micro-pore injection-molding-foaming and in-mold-decoration composite molding and a technology. The device comprises a male mold, a female mold, a film for in-mold decoration and a driving mechanism, wherein the male mold and the female mold are oppositely arranged. The film is arranged on the inner wall of the female mold in an attached mode; the driving mechanism is connected with the female mold; before filling, the driving mechanism drives the female mold to move till the size of a mold cavity is smaller than the size of a part; after a mixture melt of a polymer and a foaming agent is injected into the mold cavity and before gas is nucleated, the driving mechanism drives the female mold to be rapidly backed till the size of the mold cavity is coincident with the size of the part; after the part is completely foamed, the driving mechanism drives the female mold to be backed to take out the part. According to the secondary mold opening device, the nucleating efficiency in the foaming process of micro-pore injection-molding-foaming and in-mold-decoration composite molding is effectively improved, the pore foaming form of a product is improved, and the quality of the product is improved.

Description

technical field [0001] The invention belongs to the technical field of microporous foaming injection molding and in-mold decoration molding, and in particular relates to a secondary mold opening device and process for composite molding of microporous injection foaming and in-mold decoration. Background technique [0002] Due to its unique structure, microcellular foamed plastic has the advantages of reducing product quality, improving impact strength and sound insulation performance. However, during the molding process, the air bubbles generated may overflow from the surface of the product, resulting in a decrease in the surface quality of the product. The commonly used molding methods of microcellular foaming include intermittent microcellular foaming, continuous extrusion molding and injection molding. In the intermittent foaming process, the polymer is first made into the shape of the product, and then foamed. However, due to the complicated process and long cycle, it is...

Claims

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Application Information

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IPC IPC(8): B29C45/00
CPCB29C45/0025
Inventor 郭巍何博毛华杰章梦莹
Owner WUHAN UNIV OF TECH
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