Industry news

Injection machining -- Method to eliminate gate fracture

1、 Causes of gate fracture
 
1 residual stress near gate
 
2 distribution near gate
 
2、 Associated knowledge
 
Due to the large pressure near the gate, either residual stress or alignment problem is generated. Please refer to the crack
 
Section
 
3、 Due to material differences
 
PVC, propylene and other materials have poor liquidity.
 
24) processing of plastic products -- methods to eliminate thickness difference of products
 
1、 Reasons for thickness difference of products
 
1 deviation of mould
 
2 due to the wrinkling of the injection mold
 
3 due to the deformation of injection mould
 
2、 Associated knowledge
 
As long as the mold has a slight deviation, the molten material flowing into the mold will be uneven. At the beginning of convection, the
 
When a large amount of pressure is applied to deform the die, the deviation will be larger and larger. Even when the mold is not deviated,
 
If the gate with uneven inflow is set, the same result will be produced
 
In order to prevent the displacement and deformation of the dynamic and static die, it is sometimes necessary to set up a reliable locking groove.
 
3、 Solutions
 
1 instant: decrease injection pressure
 
2 long term: the inner cavity of the dynamic and static mold is aligned with the mold core, and the groove is set for forced adjustment
 
4、 Due to material differences
 
As long as the material with good fluidity can enter the mold cavity under low pressure, it is difficult for the product to produce thickness difference.
 
5、 References
 
It is not effective to use the coarse guide pin instead of the groove in the injection molding machine