ABS plastic parts injection molding, Polishing plastic parts surface

ABS plastic parts injection molding, Polishing plastic parts surface

Service Details:

  • Brand:Kayou
  • Serial Number: M-0038
  • Country of Origin:Shenzhen, China
  • Certificate:ISO9001

Payment & Shipping Terms:

  • Price Quote:Negotiable
  • Minimum Order: 1
  • Average Delivery Time:25 days
  • Payment Method:T/T
  • Package Details:Wooden Case
  • Ability to Supply:5 Set/per month
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ABS plastic parts injection molding, Polishing plastic parts surface

Description

ABS plastic parts injection molding, Polishing plastic parts surface

Internal Stress of Plastic Parts

Plastic melt is injected into the cavity, and pressure (compressive stress) is established in the cavity during subsequent compaction and feeding. After the filling, the pressure in the cavity does not increase, but decreases with the melt cooling. Mold temperature is always much lower than melt temperature, the melt contacting with the mold wall will rapidly cool and solidify, retaining more freezing stress, while the melt in the central layer has enough time to relax the stress due to slow cooling, thus resulting in uneven stress distribution along the thickness direction of plastic parts, which is called temperature difference stress. The section size of each part of plastic parts is often different. The flow resistance of the melt is different. The melt with thicker section can compact the parts of plastic parts with different distance from the gate, and the degree of densification will also be different. The material density of plastic parts near the gate is generally greater than that far from the gate. The shrinkage rate varies with the thickness of the section. The stress caused by the uneven shrinkage and the uneven density of the plastic parts caused by the uneven size and geometric structure (such as asymmetry) is called the volume stress of the components. The stress caused by insert means that if there are inserts in plastic parts, the stress will also be caused by the insert hindering the free shrinkage of peripheral plastics. Orientation-induced stress refers to the stress in plastic parts caused by the orientation mentioned above.

Among the four stresses mentioned above, the first three stresses are harmful to the performance of plastic parts. The reasonable design of plastic parts and moulds and the selection of process parameters should be minimized. Orientation and orientation stress may be harmful or beneficial to the properties of plastic parts. It can increase the strength of plastic parts along the orientation direction, but at the same time it will weaken the strength perpendicular to the orientation direction, and even cause cracking in serious cases. Designers should be good at utilizing the "benefit" of orientation to avoid its "harm".

Dimension and Shape Stability of Plastic Parts

This includes dimensional stability and shape stability. The former refers to the ability of plastic parts to maintain the original size accuracy in the working process, while the latter refers to the ability of plastic parts to maintain their inherent shape and resist warping deformation.

In order to make plastic parts have relatively stable size, plastic parts with small creep should be selected for load-bearing plastics. Conditions for full crystallization of plastics should be created during the forming process of crystalline plastics, such as increasing mould temperature and cooling slowly as possible within the allowable range to reduce post-shrinkage. After the plastic with strong water absorption is moulded, it is advisable to adjust the humidity treatment to achieve the moisture absorption balance so as to make the size of the plastic more stable in the subsequent working process. The plastics with larger temperature change in working environment should choose plastics with smaller linear expansion coefficient as far as possible. In any case, heat treatment after moulding is conducive to stabilizing the size of plastic parts.

The reason of warping deformation of plastic parts is that the shrinkage of each part or direction is uneven, which makes the size of plastic parts change unevenly and makes the original shape of plastic parts change. Practice has proved that plastic parts with large area and thin wall are prone to warping deformation, and plastic parts with large wall thickness difference are prone to deformation. Another reason for warping deformation of plastic parts is that the temperature distribution of the mould is too uneven, which makes the cooling rate of each part of the plastic parts too different. When designing the mould, the cooling channel or heating elements should be reasonably distributed to avoid local supercooling or superheating.

 

 

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ABS plastic parts injection molding, Polishing plastic parts surface

 

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FAX :
86-7552-3156569
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Factory Address :
E bulding 220th Reixing industrial Park XingYe Road Wusha ChangAn GuangDong provice China

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