The weld line of the plastic bottle cap
is a line-like mark on the injection part. It is the case where the plastic melt flows in separate strands or there are more than one gate or the thickness changes when the part has holes and inserts. Flow encounters are caused by incomplete fusion at their interfaces.
(1) The temperature of the material tube or the hot runner is too low, and the melt plasticization is not complete. The temperature should be increased or the plasticizing time should be appropriately extended.
(2) The temperature of the mold is too low, which leads to the slowing down of the flow rate of the melt and the rapid cooling, and the two streams cannot be effectively fused when they meet.
(3) The wall thickness of the product is too thin, and it is difficult to fill the mold, which increases the temperature difference of the melt in the mold, and is prone to weld lines. At this time, the injection pressure can be appropriately increased or the barrel temperature can be increased.
(4) The injection speed is too slow, resulting in a relatively slow flow rate, and the melt in the excellent cavity is cooled faster. Material factor: The raw material has moisture, which is converted into gas during the injection process, which affects the fusion effect of the material flow. The raw material should be dried and moisture-proof.
(1) The gate design is unreasonable, and the gate position should be avoided as far as possible around the inserts and holes. The gate where injection filling occurs should try to correct, migrate or add a stopper buffer, and try not to use or use as many gates as possible.
(2) The mold is trapped in gas, so that the gas in the cavity cannot be discharged. When the two streams converge, the fusion effect is affected.
PLASTIC BOTTLE SCREW FLIP TOP CAP
Our company has excellent production equipment and testing equipment, can effectively guarantee the quality of Plastic Bottle Screw Flip Top Cap, shorten the delivery time. The company has passed the ISO9001 quality management system certification, and passed the REACH and ROHS certification. The company is committed to the long-term independent research and development of new products, in order to help customers to grow business, achieve win-win, to become a professional global commodity production supplier for the goal. The company to "quality first, customer supreme" for the purpose, the contract, credit, we will serve you wholeheartedly. The company is willing to cooperate with you to create a better future.
Color and so on can be customized according to customer's requirement. And our Plastic Bottle Screw Flip Top Cap are only free for the customers who confirm order. But the freight for express is on buyer's account.
Tel: +86-0574-62472998 / +86-0574-62477021
E-mail: [email protected] / [email protected]
Add: FangQiao Industrial Zone, Yangming Street, Yuyao City, Zhejiang, China