How to solve problems encountered in Shanghai blow molding processing products

In the entire process of blow molding products in Shanghai, many technical difficulties are encountered. Below, the editor of Kunshan Juxinchang Company will discuss with everyone the reasons for this problem and the corresponding solutions. We look forward to providing some opinions and suggestions for everyone to solve the difficulties.

1、 Uneven vertical wall thickness of finished products during blow molding processing in Shanghai

Causes:

① The weight sag of the billet is quite severe

② The diameter difference between the two vertical sections of blow molded products is too large

Solution:

① Reduce the temperature of the preform melt, increase the extrusion rate of the preform, adjust the use of epoxy resin with lower melt flow rate, and adjust the preform control equipment

② Moderately modify the product design plan and use bottom blowing method for forming

2、 Uneven horizontal wall thickness of finished products during blow molding processing in Shanghai

Causes:

① Billet extrusion tilting

② There is a significant temperature difference between the top block and the mold core inside and outside

③ Asymmetric product appearance design

④ The blowing ratio of the billet is too high

Solution:

① Adjust the gap width deviation of the mouth mold to make the wall thickness of the billet uniform; Before closing the mold, straighten out the broken shape

② Raise or decrease the heating temperature of the mold sleeve to improve the temperature error inside and outside the mouth mold

③ Before closing the mold, pre clamp and pre expand the billet to moderately offset it towards the thick walled direction

④ Reduce the blowing ratio of the billet

3、 When blow molding products in Shanghai, orange peel like patterns or black spots appear on the surface of the finished product

Causes:

① Poor exhaust of the mold

② Plastic mold water seepage or condensation in plastic mold concave mold

③ Poor melting of the billet causes cracking of the melt

④ Inflatable air pressure

not enough

⑤ The inflation speed is relatively slow

⑥ The inflation ratio is very small

Solution:

① Plastic mold blanks undergo sandblasting treatment and are equipped with exhaust holes

② Repair plastic molds and adjust the cooling temperature of the plastic molds to above the dew point

③ Reduce the screw speed of the extruder and increase the heating temperature of the extruder

④ Raise the inflation pressure

⑤ Clean the compressed air channel and check if there is any air leakage in the blowing rod

⑥ Adjust the mold sleeve and core to improve the blowing ratio of the billet

There is no doubt that blow molding products in Shanghai will continue to encounter many other difficulties. If it is not easy to handle, you can consult the editor of Kunshan Juxinchang Company online.