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How to solve bubble problem in TPU injection molded part
Jan 29 , 2021
Bubbles are the one of major defects in TPU molded parts during injection. Bubbles in TPU molded parts not only results in appearance problems but impairs physical properties as well.There are two types of bubbles, it may be a voided area trapped within a molded plastic part or trapped gases in a molded plastic part. There are three major reason that cause bubbles in injection products. Bubbles ca...
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How to prevent and remedy the burrs(flash) in the TPU injection parts during injection process
May 10 , 2021
Burr is a common problem encountered in TPU injection products. A burr (also known as a “flash”) is an unwanted raised edge or small piece of TPU material left in a part after a injection manufacturing process. Burrs not only disfeature the appearance of plastic parts but also affect it’s properties. How to analysis and solve the burrs problem during TPU injection process. Burrs of a TPU...
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Causes and solutions of dents in injection molded parts
Jul 16 , 2021
Dents in injection molded parts are all defects caused by insufficient melt replenishment when the thicker parts are cooled. The shrinkage of plastic parts (surface shrinkage and internal shrinkage) The main reasons for such defects are improper control of molding conditions, mold defects, raw materials that do not meet the molding requirements, and unreasonable design of the shape of the plastic ...
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What causes cracking in TPU plastic injection molded parts and how to fix it
Jul 30 , 2021
Cracks are a fatal defect of TPU products, it usually happens to be hairy cracks on the surface of the product. It easily happened in the sharp edges and corners. It is harmful for products usage when the invisible cracks occur in the injection parts,The main reasons that cause cracks during production are as follows: 1 Difficult to demold 2 Overfilling 3 Mold temperature is too low 4 Defects in p...
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Causes and treatment methods of warpage in Plastic Injection Molding
Aug 13 , 2021
Warpage is the injection product defects that parts deviates from the shape accuracy requirements of the part. It is one of the common and difficult solved defects in injection mold design and injection production.Causes of warpageWarpage is caused by uneven stress and shrinkage during the products injection process. Die Adhesion, insufficient cooling, inadequate shape and strength of the part, po...
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How to deal with the slippage of the screw barrel in TPU injection molding process
Aug 27 , 2021
There are many reasons that cause the slippage of the screw barrel. For example, the abrasion of the screw and barrel. The compression ratio of the injection molding machine screw, if the feeding section is too short and the compression ratio is too small will led to the conveying capacity decrease and the screw slip. The one-way valve (check valve) malfunction can also lead the screw slip. In add...
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How to control the chromatic aberration of TPU injection molded products
Dec 10 , 2021
Color difference is a common defect in TPU injection molded products. TPU injection products may be scrapped in batches due to chromatic aberration. There are many factors affecting chromatic aberration, involving raw material TPU resin, color masterbatch, the mixing of material and color masterbatch, injection molding process, injection molding machine, mold, etc. It’s difficult to control the co...
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How to set the production temperature of TPU injection products
Jan 07 , 2022
TPU thermoplastic is melted and flowed by heating then cooled to form a certain shape products. Sufficient pressure and good control of the flow state are the keys to produce uniform and excellent physical properties TPU injection products. Compared with PVC and ABS, TPU has a strict processing temperature range. If the temperature is too high, the viscosity will decrease, the resin melt will flow...
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How we help customer to solve the fogging appearance in TPU injection products
Apr 22 , 2022
Customer description: compared with the test product, the bulk products is with fogging and poor transparency problem. Technician analyse: 1.Check the temperature of cooling water. Check the mold temperature. Check if the transparency of all the products is uniform. 2.Is the TPU material been fully dried 3.Is the production process of test product and bulk products same? 4.High temperature will be...
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