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| Key Word: Taili Plastic Machinery; Taili Plastic Machinery-Capacity Improving Expert; Efficient; Stable The outer packaging of cosmetics mostly uses PMMA material. Due to the high requirements for the accuracy and transparency of the product surface, in the process of injection molding production, the requirements for the process, injection molding machine and mold are also particularly high. A few days ago, Mr. Liu of Ningbo said to me that a new mold in his factory had a big problem recently, and the customer was pressing for delivery. However, the product rate of his trial mold was too low, with a scrap rate of nearly 50%, which could not be improved. The main problem of Mr. Liu's product is that the surface of the product is not clear enough. There are melting lines, and the vacuum bubbles will produce inside easily. Even if cold water is used to freeze the surface, good products still can¡¯t be produced.  1£®Increase injection speed and decrease injection pressureFor this kind of PMMA products, if you want to improve the surface accuracy of the products, you should apply the multi-stage injection method with other conditions not changed. At the first section of the nozzle, try to concentrate the cold material. For this kind of products that require high surface accuracy, the material temperature will greatly affect the transparency. In the second stage, the injection speed should be increased as much as possible, and the injection pressure should be reduced, which can effectively reduce the internal stress of the melt and improve the surface accuracy. 2£®Mould precision Many less experienced friends can't treat this kind of product with the general mold idea. This kind of transparent PMMA injection molding product also has high requirements for the mold. Generally, it has high requirements for the mold material and the finish machining of the mold. If conditions permit, it will effectively improve the surface accuracy of the product by using the precision carving and high-speed milling process as far as possible. 3£®Packing vacuum bubble The vacuum bubble of this kind of PMMA material is caused by the internal pressure is not solid and the surface shrinks too fast, which causes the material to concentrate on both sides. When the internal channel of the fluid is not closed, adding packing pressure at the end of the injection will reduce the vacuum bubble caused by uneven filling of the product. Of course, this process will increase the quality of the product and increase the cost. Sometimes when the packing pressure has no effect, it is likely that the filling speed of the second injection section is not fast enough, resulting in the internal channel of the fluid has been closed, so that the packing pressure can not be transferred in. In this case, there is no alternative but to change the injection molding machine. Mr. Liu's problems have been adjusted according to the above ideas. As expected, there are no problems. Taili Plastic Machinery always keeps in mind that what a good injection molding machine factory should do is to help improving the capacity and boosting the profits, rather than offer the similar products the customers need. This is also what Taili Plastic Machinery keeps doing. Follow Taili Plastic Machinery and we will share more with you. |
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