Analysis of the Causes of Black Spots in the Color Change Coking of Injection Molding Products

Analysis and solution to the black spots in the color change coking of injection molded products

The main reason for the black spots in the discoloration coking of injection molded products is that the plastic or added ultraviolet absorbers, antistatic agents, etc. are decomposed in the cylinder by overheating, or the residence time in the cylinder is too long to be decomposed and coked, and then injected along with the melt. The cavity is formed. analyse as below: 1. Machine side: (1) Due to the loss of control of the heating control system, the barrel is overheated and the decomposition is blackened. (2) Due to the defects of the screw or the barrel, the melt is caught and accumulated, and it is subjected to long-time fixed heating to cause decomposition. You should check if the rubber head kit is worn or if there is any metal foreign matter inside. (3) Some plastics, such as ABS, are subjected to high heat in the cylinder and cross-linked and coked. In the case of almost maintaining the original particle shape, it is difficult to melt, and is crushed by the screw to be entrained into the workpiece. 2. Mold aspect: (1) The mold is not vented, easy to burn, or the size of the pouring system is too small, and the shearing is too much to cause coking. (2) There are improper oil lubricants and mold release agents in the mold. 3. Plastics: The plastic has too much volatile matter, too much humidity, too much impurities, too much recycled material, and is contaminated. 4. Processing: (1) The pressure is too high, the speed is too high, the back pressure is too large, and the speed is too fast, the material temperature is decomposed. (2) The barrel should be cleaned regularly to remove additives that are less resistant than plastic.

Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn

LED Ceiling Light

The LED Ceiling Light is widely used at Office, shopping mall, Hotel, showroom and so on.

The advantages for DiLin LED Ceiling Light

1. Fashion design with high quality of aluminum housing and constuction to make sure the cooling of LED Ceiling Light good enough.

2. High quality of COB and driver solution to make sure LED Ceiling light quality stable enough.

3. Strong Engineer & QC team are good at customizing and offer flexible solution for competitive Ceiling light.

4. Fast lead time: 5-7days for samples and 15-25days for bulk order.

5. 3 or 5 year warranty with standardized after-sale serivce process.

Led Ceiling Light,Ceiling Light Fixtures,Cone Ceiling Light,Ceiling And Wall Light Kits

Jiangmen Dilin Lighting High-Tech Co., Ltd. , https://www.jmdilinled.com