Frequently Asked Problems and Solutions for TPE Injection
Source：德创化工Time：2019-07-20Hits：2290
Thermoplastic elastomers in the process of processing molding due to the process, the degree of match of materials and other reasons, in the molding plus
We always encounter various problems in the process. The following questions are based on the customer's usual processing.
The questions and corresponding solutions are expected to help you:
First, the possible reasons for the die variant of the TPE product:
1, the cooling time is too short, the finished product does not cool enough; -- Solution: Extension of cooling time;
2, the opening speed is too fast, strong pull variant; -- J solution: slow down the opening speed;
3, the structure of the finished product is defective; Corresponding to the solution, modification of the mold;
4, the mold temperature is too high, the finished product cooling is not in place. Solution: lower die temperature.
Second, TPE finished products are easy to break:
1, material temperature is too low or mold temperature is too low; Solution: Raise the barrel temperature and mold temperature;
2, demoulding slope is not enough or the top out of the improper way; Solution: Modify the mold;
3, the gate is too small; Solution: Modify the mold;
4, insufficient mold angle; Solution: Modify the mold.
Three: After the finished product is molded, there is a pattern:
1, the rate of fire is too fast, the air in the cavity can not be discharged instantaneously; Solution: Reduce the rate of fire, make the cavity empty
Smooth exhaust;
2, raw materials contain water; , solution: baking materials;
3, the forming temperature is too high, and the threshing is decomposed by high temperature; Solution: lower forming temperature;
4, air into the barrel. Solutions; Lower the temperature and increase the pressure in the rear section of the tube.
Fourth, after the TPE finished product is molded, there are hair edge reasons and solutions:
1, the pressure is too large, the splitting force is greater than the locking force, forced to start the mold; Solution: lower the pressure, fly the mold
, increase the locking force;
2, fire pressure and retention pressure is too large; Solution: Reduce emitter pressure and maintain pressure;
3, too fast, high material temperature; Solution 3, reduce the rate of fire and material temperature;
4, mold exhaust hole blockage. Solution, cleaning mold.
V: Insufficient filling of products
1, insufficient shooting pressure, slow firing rate or debris in the mold mouth; Solution: Increase the fire pressure, increase the rate of fire and clean up
Modular mouth shot mouth;
2, the forming temperature is too low, the pouring channel is too small; Solution, increase the forming temperature, modify the flow path;
3, the air in the mold cavity can not be completely discharged; Solution: add or enlarge vent;
4, the shooting time is too short, the amount of fire is insufficient. Solution, extend the time of exit, increase the amount of exit.
Six, TPE products have binding lines
1, insufficient shooting pressure, slow firing rate, too small gate and channel; Solution, increase firing pressure, rate of fire, modification
Pouring channel; Another: low nozzle temperature, long molding cycle, too many color mother titanium white powder, color mother dispersion is also not good
One of the reasons for this.
2, the forming temperature and mold temperature are too low; Solution, increase molding temperature and mold temperature, increase back pressure or add
Speed screw speed;
3, the exhaust area of the confluence is not smooth or there is no overflow pool(cold well); Solution, conjunction to increase vent or
Increase overflow pool;
4, use too many demolators. Solution, reduce the use of demoulding agents.
VII: Poor gloss of TPE products:
1, the rate of fire is too slow, the pressure is too low, and the mold temperature is low; Solution, increase the firing pressure, rate of fire, mold temperature;
2, there is water or grease pollution in the mold cavity; Solution, wipe clean;
3, the mold surface grinding is not good or the gate and runner are too small; Solution, modification of the mold;
4, insufficient emission or raw materials containing water. Solution, increase the rate of fire, extend the shooting time and baking
Material.
Eight; The surface of the product has a pattern:
1, the pressure is too high or too low, the rate of fire is too fast or too slow; Solution, adjust the appropriate pressure or rate of fire;
2, the holding time is too short or the gate is too small; Solution, increase the holding time or change the large gate;
3, mold temperature and gate temperature is too low; Solution, improve die and gate temperature;
4, poor melting of materials. Solution, increase temperature, back pressure or speed up the screw.
IX, TPE product extrusion product surface roughness:
1, low forming temperature; Solution, increase temperature, back pressure and screw speed;
2, mold temperature is too low; Solution, increase mold temperature;
Ten; The phenomenon of mass on the surface of products
1, the material pipe is not cleaned or there are debris; Solution, re-cleaning of material pipes;
2, additives such as color mother or carrier not as required; Solution, find the corresponding color master;
XI: After the TPE product was molded, Pengzhang:
1, die head temperature is too low, or screw speed is too fast; Solution, improve die head temperature, reduce screw speed;
2, the limit is too fast. Solution, adjust the material limiting device.
XII: TPE produces a large amount of gas when extruded:
1, the overall temperature is too high; 2, there are debris in the material tube.
XIII: TPE products have shrunk
1, raw materials contain water;
2, melt body temperature is too high, screw speed is too fast.
Dechuang Chemical Co., Ltd. of Dongguan City is a professional research and development production of elastomer[TPE][TPR][TPV][TPE][TPEE] rubber plastic raw materials manufacturers, DeChuang has its own research and development team and sales consultants. Professional technical knowledge is our service to the majority of customers standard! Any question about the rubber material of thermoplastic elastomer can be consulted with us, we will serve you wholeheartedly!
