One of the common issues in plastic products is caused by defects during the knitting process.
Here's a detailed summary from the technical team at Zhongke Engineering Plastic Co., Ltd. Please check it out!
First, material shortage problems often occur due to several reasons. These include: 1) insufficient injection pressure, 2) slow injection speed, 3) poor venting in the mold cavity, 4) blocked water inlet, 5) short injection time, and 6) leakage from the nozzle. Second, edge peaks are typically caused by excessive injection pressure, or when the mold is not properly locked due to insufficient clamping force. Other factors include an improperly sealed mold, debris inside the mold, or deformation of the mold template. Mold joint defects can also contribute to this issue. Third, bubbles in the product may result from moisture in the plastic material, decomposition of the material, low forming temperature, poor welding, impurities in raw materials, insufficient thickness around inserts, low mold temperature, or an unreasonable gate design. Moisture in the material is also a common cause. Fourth, bonding lines usually appear when the temperature or material temperature is too low, or when the cavity is not properly vented. Fifth, surface flow marks may be caused by moisture or volatile substances in the plastic, insufficient baking temperature, or an oversized gate. Sixth, black spots or color mixing issues often occur due to decomposed plastic material, scrap residue between the plunger and barrel, contamination, uneven particle size, or poor venting in the die cavity. Lastly, warping or deformation can happen if the mold temperature is too high, cooling time is inadequate, the product wall thickness varies significantly, the ejector pin is improperly positioned, or the cavity surface is rough, causing friction during demolding. For more information on plastic manufacturing defects and solutions, visit: [http://news.chinawj.com.cn](http://news.chinawj.com.cn)
Here's a detailed summary from the technical team at Zhongke Engineering Plastic Co., Ltd. Please check it out!
First, material shortage problems often occur due to several reasons. These include: 1) insufficient injection pressure, 2) slow injection speed, 3) poor venting in the mold cavity, 4) blocked water inlet, 5) short injection time, and 6) leakage from the nozzle. Second, edge peaks are typically caused by excessive injection pressure, or when the mold is not properly locked due to insufficient clamping force. Other factors include an improperly sealed mold, debris inside the mold, or deformation of the mold template. Mold joint defects can also contribute to this issue. Third, bubbles in the product may result from moisture in the plastic material, decomposition of the material, low forming temperature, poor welding, impurities in raw materials, insufficient thickness around inserts, low mold temperature, or an unreasonable gate design. Moisture in the material is also a common cause. Fourth, bonding lines usually appear when the temperature or material temperature is too low, or when the cavity is not properly vented. Fifth, surface flow marks may be caused by moisture or volatile substances in the plastic, insufficient baking temperature, or an oversized gate. Sixth, black spots or color mixing issues often occur due to decomposed plastic material, scrap residue between the plunger and barrel, contamination, uneven particle size, or poor venting in the die cavity. Lastly, warping or deformation can happen if the mold temperature is too high, cooling time is inadequate, the product wall thickness varies significantly, the ejector pin is improperly positioned, or the cavity surface is rough, causing friction during demolding. For more information on plastic manufacturing defects and solutions, visit: [http://news.chinawj.com.cn](http://news.chinawj.com.cn)
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