Warpage and deformation of common problems in injection molding

Posted February 1, 2020 by alvarad982stedk

The basic reason for surface sag: from the perspective of plastics, when the plastic cools and shrink, insufficient filling will lead to product surface sag or internal cavity.
Warpage and deformation of injection products are very difficult problems. Mainly from the mold design to solve the problem, and the forming conditions of the adjustment effect is very limited. The causes and solutions of warpage and deformation can refer to the following items:

1) When the deformation is caused by the residual stress caused by the forming conditions, the stress can be eliminated by reducing the injection pressure, increasing the mold temperature, increasing the resin temperature or annealing.

2) When the stress deformation is caused by bad demoulding, it can be solved by increasing the number or area of push rods and setting the demoulding angle.

3) If the cooling method is not suitable and the cooling time is not uniform or sufficient, the cooling method can be adjusted and the cooling time can be extended. For example, a cooling circuit can be set as close to the deformation as possible.

4) For the deformation caused by forming shrinkage, it is necessary to modify the mold design. Among them, the most important thing is to make the wall thickness of products consistent. Sometimes, in the case of necessity, we have to adjust the mold in the opposite direction by measuring the deformation of the product. In general, the deformation of crystalline resin (such as polyformaldehyde, nylon, polypropylene, polyethylene and PET resin) is larger than that of non crystalline resin (such as PMMA resin, PVC, polystyrene, ABS resin and as resin). In addition, due to the fiber orientation of glass fiber reinforced resin, the deformation is also large.

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 About JasonMould Industrial Company Limited

Low volume Manufacturing China

Jasonmould is a China mold maker of plastic molds- injection mold, die casting moulds, plastic blow molding, rotational molding, medical plastic injection molding, two shot plastic injection molding, insert molding, overmolding, metal injection molding, micro injection molding, powder injection molding, ceramic injection molding, liquid injection molding, husky injection molding, household mold, casting mold, die mold tool, custom molds, china moulds, rapid prototyping tooling, plastic prototyping tooling, punch press tooling, die and tooling for mobile/ cell phone parts, automotive parts, vacuum cleaners, rechargeable tools, telephones, copiers, computers, multimedia speakers, and many other electronic products and household appliances. And also a plastic product manufacturer, mold manufacturer China– plastic parts, plastic water tank, plastic balls, plastic containers, plastic buckle, plastic anchor, plastic hanger, plastic spoon, plastic pipe fitting, plastic tumble, plastic tableware, plastic cups, plastic bottles, plastic tray, plastic cosmetic container, plastic case, plastic food container, plastic chairs, plastic caps, plastic cap closure, plastic tubes, plastic water pipes, plastic knobs, plastic tubing, plastic utility boxes, plastic racks and so on.

Person: James Yuan
Company: JasonMould Industrial Company Limited
Add:  LongGang Village,LongXi Town,BoLuo County,HuiZhou City,GuangDong Province, China
Tel: 86-752-6682869
Email: [email protected]

Site: https://www.jasonmolding.com/custom-injection-molding/
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Contact Email [email protected]
Issued By JasonMould Industrial Company Limited
Phone 86-752-6682869
Business Address LongGang Village, LongXi Town, BoLuo County,HuiZhou City, GuangDong Province, China
Country China
Categories Business
Tags Low volume Manufacturing China
Last Updated February 1, 2020