How to deal with warpage and deformation when plastic mold injection? - Knowledge

Plastic mold injection molding products appear to warpage and deformation is a very piece of the zigzag problem. Mainly should be dealt with from the mold planning, while the molding conditions of the adjustment of the role are very limited. So, plastic mold injection molding products warpage and deformation when we have to deal with it?

1、If the stress deformation is caused by poor release, it can be dealt with by increasing the number or area of the pushrod and setting the release slope.
2、If the deformation is caused by the residual stress caused by the molding conditions, the stress can be eliminated by decreasing the injection pressure, increasing the mold and making the mold temperature uniform, and increasing the resin temperature or using annealing methods.
3、If the cooling method is not suitable so that the cooling is not uniform or the cooling time is not enough, the cooling method can be adjusted and the cooling time can be extended. For example, the cooling circuit can be set as close to the deformation as possible.

4、On the deformation caused by the shortening of the molding, it is necessary to amend the planning of the mold. Among them, the most important thing is to pay attention to making the product wall thickness common. Sometimes, as a last resort, we have to measure the deformation of the product and correct it by trimming the mold in the opposite direction. Resins with large shortening rates are generally crystalline resins (such as polyformaldehyde, nylon, polypropylene, polyethylene, and PET resins) with larger deformation than non-crystalline resins (such as PMMA resins, PVC, polystyrene, ABS resins and AS resins). In addition, because the glass fiber reinforced resin has fiber alignment, the deformation is also large.