Sprue sets are usually made of high carbon tool steel. Injection mold sprue design elements are as follows: 1. To facilitate gating system condensate material pulled from the main road in and consider expansion of the plastic melt, sprue design into a cone. 2. The big end of the main channel was rounded with a radius take r = 1 ~ 3mm, in order to reduce the flow rate of the steering transition resistance. 3. ensure the plastic forming under good conditions, the length of the injection mold sprue should be as short as possible, selling mobile phone sets, otherwise it would increase the sprue slug, and increase the pressure loss, the plastic melt to cool too much influence injection molding. 4. molten plastic completely into the main channel without overflow, should be the main channel of the injection machine nozzle tight butt, butt joint is designed sprue hemispherical pits. Sprue parts are frequently designed to be disassembled sprue bushing to high quality steel processing and heat treatment alone, so the use of electric heating in the main channel of the material in order to raise the temperature. Shenzhen integration into the plastic products factory in various plastic products production, manufacturing for many years, for a variety of plastic products used items and contraindications very understanding. Here are seven of plastic products on taboo Note: In case of high temperatures may produce carcinogenic properties: heat-resistant temperature only to 70 ℃, high temperature, high humidity, will be hydrolyzed in boiling water. Plastic or light degradation after hydrolysis into small molecule monomer, certain small molecules monomers are toxic, and some are toxic additive component. High temperature hydrolysis may cause cancer. Common products: mineral water bottles, soda bottles, peanut oil bottles reminder: the hot water into mineral water bottles, water bottles immediately deflated, we often encounter this situation. In fact, with the deformation of the bottle, has produced a lot of carcinogens, in the long run is undoubtedly a suicide. Thus, beverage bottles used up would be lost, not to be used as cups, or containers used for storage containing other items. High density polyethylene plastic products plastic (HDPE) is not in direct contact with food Characteristics: melting point 131-137 ℃. Heat distortion temperature of 78 ℃, opaque, mobile phone sets, hard and strong, generally can not be in direct contact with food. Common products: detergent, bath products containers, plastic bags, etc. Reminder: these containers can not be used in full bloom food. While we usually buy bread and other things will be used in plastic bags, but do not worry, those foods have individually packaged isolation, we taboo is "in direct contact." The plastic products of PVC (PVC) can not be used as food packaging features: is the second largest category of plastic varieties, is the most complicated recipe plastic varieties. The disadvantage is that poor heat resistance and poor anti-aging properties. PVC produced by the decomposition of toxic chlorine monomer, PVC among a large number of additives and some also poisonous. Common items: PVC pipe, raincoat, building materials, plastic film, plastic boxes and other products reminder: not for food packaging, do not let it come into contact with food. Low-density polyethylene plastic plastic products (LDPE) poor heat resistance but is less harmful specializing in the production of mobile phone sets of mobile phone sets _ _ integration into a plastic mold factory from Shenzhen harmony Technology Limited. Shenzhen harmony Technology Limited (www.rhctech.net) strong, credible, in Shenzhen of plastic products industry has accumulated a large number of loyal customers. The company better work attitude and continuous improvement will lead the integration of innovative ideas into a plastic mold manufacturers and you hand in hand into the brilliant, for a better future!