Fibrous resin thin-wall product and production method thereof

A thin-walled product and fiber technology, applied in the field of thermoplastic resin thin-walled products, can solve problems such as increased warping deformation, uneven residual stress, and increased filling time, and achieve high dimensional stability, good appearance quality, and improved The effect of mobility

Active Publication Date: 2010-12-01
CHANGCHUN ZHONGTUO MOLDING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the fluidity of the melt can be improved by adding supercritical nitrogen or carbon dioxide to the melt, there are still the following problems: as the fiber content increases, the effect will gradually decrease; When the molten material is injected, the surface temperature of the mold cavity is relatively low. During the process of filling the molten material, the product layer in contact with the cavity surface is rapidly cooled to form a solidified layer, which reduces the passing area when the molten material is filled. For thin-walled products with a large area, not only the filling time is significantly increased and the injection pressure is increased, but also the residual stres

Method used

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  • Fibrous resin thin-wall product and production method thereof
  • Fibrous resin thin-wall product and production method thereof
  • Fibrous resin thin-wall product and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] Example 1

[0019] Take a 14" notebook computer A-side shell in the product of the present invention, the size is 241mm×333mm, the wall thickness is 1mm, the raw material is the heat-resistant nylon of Kingfa Technology Co., Ltd., containing 50% plant fiber. In the appearance Electric heating pipes and cooling water channels are arranged in the cavity mold of face 1 to realize rapid heating and cooling of the cavity surface, and the surface of the cavity forming the appearance surface is polished; the gate is set in the center of the back surface; the appearance surface is formed The core cavity mold can also use this method to arrange electric heating pipes for heating and cooling water channels for cooling. The injection molding machine adopts Haitian injection molding machine, and the plasticization system is in accordance with the plasticization disclosed in the patent ZL200820057051.8 authorized on February 4, 2009 The device has a screw diameter of 60mm; supercritica...

Example Embodiment

[0022] Example 2

[0023] The difference from Example 1 is that only after the injection and mixing into the cavity is completed, the pressure in the cavity is further maintained at 10 MPa for 5 seconds, the holding pressure is removed, and cooling water is injected into the cooling channel of the mold at the same time. Decrease the temperature of the mold cavity surface / core cavity surface to 90°C, and then open the mold to take the part. The appearance surface of the product 1 is bright, without foaming marks, and no fiber exposed; the size of the product meets the design requirements, and the warpage is small; the product is sectioned and under a microscope at 100 times, it can be observed that there is a layer of about 10 The micron-thick fiber-free resin layer 2, and the core layer 3 contains fibers but no cells.

[0024] In this embodiment, the non-foaming pressure of the resin in the cavity is to maintain the mold cavity surface / core cavity surface temperature at 250°C unti...

Example Embodiment

[0025] Example 3

[0026] The difference from Example 1 is that the amount of nitrogen injected is changed to 0.1%, the heating temperature of the mold cavity surface is 200°C, and the pressure of the melt during injection is set to 60 MPa. The appearance surface 1 of the obtained product is bright, without foaming marks, and no fiber exposed; the size of the product meets the design requirements, and the warpage is small; the product is cut and under a microscope at 100 times, it can be observed that there is a layer on the surface layer of the appearance surface 1. The fiber-free resin layer 2 is about 10 microns thick, and the core layer 3 containing fibers and micropores has a large number of cells with a diameter of 10-30 microns. The molding cycle is also shortened by 5 seconds compared to Example 1.

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PUM

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Abstract

The invention relates to an injection molding product, in particular to a fibrous resin thin-wall product with the fiber content of 20%-50% and a production method thereof. The wall thickness of the product is 0.8-1.5 mm, and one or/and more surfaces of the product are provided with a non-fibrous resin surface layer with the thickness of 1-20 micrometers. In the production method, supercritical nitrogen or carbon dioxide is used as a plasticizer, the surface temperature of a mould cavity is raised before injection so that the fluidity is further improved, and the surface of the mould cavity is cooled to a lower temperature after injection, thereby a lighter and thinner product is obtained; and the product has the advantages of favorable apparent quality, high strength and high size stability.

Description

technical field [0001] The invention relates to an injection molding product, in particular to a thermoplastic resin thin-walled product with a fiber content of 20-50% and an injection molding method. Background technique [0002] Driven by the knowledge economy and the information age in the 21st century, thin-walled plastic parts have been more and more widely used in office equipment, communications, electronics, instruments, audio-visual, medical and other fields. Warpage puts forward higher requirements. Adding reinforcing fibers to polymers, such as glass fibers, can increase product strength, rigidity, hardness, etc., increase its heat resistance and heat distortion temperature, improve dimensional stability, reduce shrinkage, and reduce creep. However, the higher the fiber content in the polymer, the lower the fill flow of the material. When injection molding thin-walled parts, very high injection pressures are required to achieve cavity filling. Too high injectio...

Claims

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Application Information

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IPC IPC(8): C08L101/00C08K3/20C08K3/02C08K7/14C08K7/06C08K7/04B29C45/00B29C45/78C08L77/00B29K105/06
CPCY02P20/54
Inventor 唐庆华
Owner CHANGCHUN ZHONGTUO MOLDING TECH
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