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A simulation device and detection method for surface stress whitening of plastic products

A technology for plastic products and surface stress, which is applied in measuring devices, analytical materials, instruments, etc., can solve the problem of inability to simulate the surface stress whitening process of plastic products, and achieve the effect of simple, practical and cost-saving detection methods.

Active Publication Date: 2017-12-01
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that existing inspection methods cannot truly simulate the surface stress whitening process of plastic products in the process of manufacturing, assembling and using, the present invention provides a simulation device for surface stress whitening of plastic products

Method used

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  • A simulation device and detection method for surface stress whitening of plastic products
  • A simulation device and detection method for surface stress whitening of plastic products
  • A simulation device and detection method for surface stress whitening of plastic products

Examples

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Embodiment 1

[0049] Embodiment 1 is used to illustrate that the simulation device and detection method of the present invention are used in the selection of plastic materials and to determine the standard value of the anti-stress whitening characteristics. For the convenience of description, this embodiment is made of plastic materials provided by two different manufacturers Each sample of the plastic product is one, and each sample is only subjected to a simulated impact test, and the pros and cons of the anti-stress whitening characteristics of the two plastic materials are judged through testing.

[0050] The side door panel of a certain model produced by an automobile manufacturer is produced using the polypropylene talcum powder filling material PP+T25 provided by suppliers A and B. During the assembly process of the two side door panels, the operator usually presses the surface when installing and fixing the door panels. There are rigid metal protrusions on the back of the door panels...

Embodiment 2

[0062] Embodiment 2 is used to illustrate that the simulation device and detection method of the present invention are used in the selection of plastic materials and to determine the standard value of the anti-stress whitening characteristics. For the convenience of description, this embodiment selects plastic products made of three different plastic materials One sample each, and each sample is only subjected to a simulated impact test, and it is judged which plastic material is better to choose through testing.

[0063] Now it is necessary to choose a material for a mobile phone color case. There are three plastic materials available: PC+ABS, PC+PET, PC+PBT, etc. Since the mobile phone needs to be fastened during the assembly process, the plastic mobile phone case may appear white.

[0064] The solution of this embodiment specifically includes the following steps:

[0065] a: Select a mobile phone case sample made of three materials: PC+ABS, PC+PET, and PC+PBT. Use a digital...

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Abstract

In order to solve the technical problem that the existing detection devices cannot truly simulate the surface stress whitening process of plastic products in the process of manufacture, assembly and use, and the detection method cannot quantify the degree of surface stress whitening of plastic products, the present invention provides a plastic product Stress whitening simulation device and detection method. The simulation device includes: a base, a supporting mechanism, a lifting mechanism, an impact mechanism, and a holding mechanism; in the detection method, the plastic product is first placed in the above simulation device for an impact test, and then the surface of the plastic product before and after impact is measured with a spectrophotometer. The total color difference value of the area to be tested is used to represent the degree of stress-whitening resistance of plastic products. The simulation device and detection method of the invention truly simulate the stress whitening process of plastic products, and quantify the degree of stress whitening.

Description

technical field [0001] The invention relates to a method for detecting the performance of plastic products, in particular to a simulation device and a method for detecting stress whitening on the surface of plastic products. Background technique [0002] Common plastic materials such as polypropylene PP, polyethylene PE, polystyrene HIPS, polyvinyl chloride PVC, ABS, PC, polymer alloys and their filled polymers are easily stretched, bent, External forces such as impact often cause the surface to turn white. This kind of surface whitening is mainly due to the fact that the plastic material produces a large number of microcrack accumulation areas under the action of stress. A region with a lowered refractive index appears white. The main reasons for the stress whitening of plastic products are the excessive impact force of the thimble during the injection molding process, the impact during the assembly process, the collision and stretching during use, etc. Common plastic pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/303
Inventor 曾勇李尚于细涛常德才刘勇
Owner BYD CO LTD