Process for equalizing orientation and/or distribution of fillers in injection moulded parts

A technology of injection molding and filler orientation, applied in the field of injection molded parts, fiber orientation isotropy, which can solve the problem of not being suitable for manufacturing fibers with satisfactory and sufficient isotropy, no filler, affecting injection molding Sufficient improvement of component strength and other issues

Inactive Publication Date: 2006-12-06
EMS CHEM AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In addition, it is known from JP 62249717A to use ultrasonic waves in the injection molding process of polycarbonate discs to make the polymer molecular chains in the molten state uniformly oriented, but without fillers
[0008] However, none of the methods mentioned here are suitable for producing fibers with a satisfactory and sufficient isotropy and thus prevent a sufficient increase in the strength of injection molded parts
[0009] Similar problems are known to exist in the case of pigment-filled plastic materials, for example with effect pigments such as metallic mica or aluminum flakes, where due to the uneven distribution and orientation of the pigments it is still visible in injection molded parts comprising transparent plastic materials join line and merge line

Method used

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Embodiment Construction

[0019] Suitable as matrix materials are all polymers suitable for injection moulding such as thermoplastics, hard plastics or vulcanised elastomers or blends thereof, eg mixtures or alloys. Suitable thermoplastics are homopolyamides, copolyamides or polymer blends thereof. Likewise, polystyrene, polyolefins, cellulose esters, cellulose ethers, polymethacrylates, and the like can be used. Useful in the process according to the invention are, for example, polyamides (preferably PA46, PA6, PA66, PA612, PA11, PA12, partially aromatic polyamides such as PA6T / 6I, PA6I / 6T / 66, PA6T / 66 or PA9T, and transparent polyamide), polyester (preferably PET, PBT, PEN and PBN), polycarbonate, polyolefin (preferably PE and PP), polyoxymethylene (POM) and transparent polymers (preferably ABS, SAN, PC, PMMA, etc., Also the already mentioned transparent polyamides). Blends (mixtures, etc.) of the polymer with the above or other polymers are also possible.

[0020] Preferred transparent polyamides ...

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PUM

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Abstract

The distribution of fiber orientation and filler = concentration is equalized during injection molding by applying to the = mold mass a sonic vibration which lies within the spectrum of the first = 10 resonant frequencies of the system, e.g. vibrating the mold between = 20 and 60 kHz. The vibration is applied during injection and optionally = also during solidification or cooling. It is particularly applied near = the injection point, at flow obstacles and near seams.

Description

technical field [0001] The present invention relates to a method for homogenizing the orientation and / or distribution of fillers in a moulding compound for injection mouldings comprising a filled plastic material, in particular for isotropic orientation of fibres in a fibre-reinforced moulding compound . Reinforcing materials may include, for example, glass, carbon, ceramic, aramid, or other materials. The term "fibrous reinforcement" should also be understood as a material having a fibrous, oval or sheet-like shape. Furthermore, the invention also relates to corresponding injection moulding methods, the use of these methods and corresponding injection moulded parts. Such injection-molded parts are used, for example, as components in the automotive industry. There they replace the previous metal parts because of their advantages over metal parts: not only because of their low specific gravity, but also by introducing different components, their mechanical and thermal proper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/56B29C45/57B29C45/17B29K105/06
CPCB29C45/568B29C45/0005B29C45/0013B29C45/0025B29C2045/0008B29C2045/0031B29C2791/008B29C45/46B29C45/17
Inventor 托马斯·耶尔奇维尔纳·卡吉
Owner EMS CHEM AG
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