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How to deal with the problem of fusion line?

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Reason analysis: From the perspective of plastics, the melting line is essentially caused by the incomplete melting of two plastic flow fronts. Solution: To eliminate or reduce the melting line, plastics must have low viscosity, high temperature, sufficient pressure and enough time to melt completely. Usually, in the case of good exhaust, accelerating the filling and feeding speed and increasing the pressure as soon as possible after the combination of two plastic flow fronts will help to solve the melting line problem.
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How to solve the problem of surface depression?

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Basic Reasons : From the perspective of plastics, when the plastics are cooled and contracted, insufficient feeding will lead to dents on the external surface or holes in the interior of the products. Depression occurs in different locations, and the causes and solutions of the defects are also different. 1. When the depression occurs at the final cooling position of the thick-walled product or at a distance from the gate: Cause analysis: Typical surface depressions or voids at the thick wall and far away from the gate are usually due to the increase of effective viscosity and pressure loss, resulting in insufficient cavity pressure, resulting in insufficient feeding pressure. Solution: Increase the pressure of feeding and speed up the feeding rate 2. Surface depressions or cavitations occur near the gate Cause analysis: Depression occurs near gate, usually due to lack of gate freezing. There are several reasons affecting gate freezing: it may be caused by the decrease of ef...
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Factors that are more susceptible to influence in the production of plastic products

Fillers, also known as fillers and fillers, are solid substances added to the matrix of polymer materials to reduce costs and/or improve some properties of products. The main factors to be considered when choosing fillers are as follows: 1. Low Price The price of filler has a great influence on the cost of  plastics . The proportion of polyvinyl chloride plastics with fillers is 2-3 times that without fillers. Therefore, the proportion of polyvinyl chloride plastics with fillers increases rapidly with the increase of the amount of fillers. Therefore, the cost based on weight is not as accurate as that based on volume. In application, the volume cost must be considered. The small proportion of filler is more advantageous to the volume cost. 2. Oil Absorption That is, the ability of fillers to absorb plasticizers. It depends on the fineness of filler and the variety of filler and plasticizer. The cost of plastics increases with the increase of oil absorption. 3. Electrica...
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