Basic steps of rubber mixing

      If it is an indispensable part to make rubber raw rubber into a variety of mature rubber products, what are the links of rubber mixing? The following is a professional rubber manufacturer to introduce you to the four major steps of rubber mixing.

      First, the choice of mixing materials, in the process of mixing, due to the low cohesion between the rubber molecules, the high-strength and high-temperature silica filler becomes the most important compounding agent for rubber. When other compounding agents are used, Need to consider the requirements of high temperature resistance, that is, under the application conditions of rubber, they should not be volatilized, decomposed, charred or discolored, etc. In order to maintain the heat resistance of raw rubber, the silicon bond is reduced by acid and alkali, and the mixture is broken and mixed. To prevent the introduction of foreign acids and alkalis, it is necessary to remove the acidic substances generated by the decomposition of the peroxide vulcanizing agent in time.
      Second, in the mixing of the raw rubber and other ingredients into the vacuum kneader, the temperature is not high at the beginning, during the stirring process, by the temperature of the temperature slowly reached 155-160 degrees, It will take another half hour.

     Third, put the cooked glue in the open mill to smooth and roll into a roll. Just take care not to get dirty. The number of rolls only needs 2-3 rings.
     Fourth, after smoothing, it should be cooled. The time is about 3-4 hours. Then, through the match net, the glue is filtered again. The purpose is to filter out some solid materials inside the glue.
   

The difference between PE/PVC/POF heat shrinkable film

Heat shrinkable film is used in the sale and transportation of various products, and its main function is to stabilize, cover and protect the product. The shrink film must have high puncture resistance, good shrinkage and certain shrinkage stress. There are many types of heat shrinkable film, which are used in various fields. The most important three types are PE/PVC/POF heat shrinkable film. What are the differences between the three?

PE heat shrink film PE polyethylene, which is a transparent thermoplastic. PE is commonly used in three categories, namely: LDPE HDPE LLDPE The three polyethylene monomers are the same, except that the process conditions used to synthesize these polyethylenes are different, so three different polyethylenes are produced. Variety, the performance of the three materials has a big difference. PE film is a very tough material, not easy to smash with ordinary plastic pulverizer. Because the PE film is soft and tough, it is not easy to shred, not to mention the high temperature of the tool at high speed, which will cause the LDPE to melt and adhere to the blade. The granulation of PE can be directly placed into the feeding port of the extruder, and the PE film is dragged into the barrel by the shearing force of the screw to heat, melt and extrude the granule. The first grade material recycled by PE is still blown film, used for non-food and pharmaceutical packaging, and is also widely used in the production of oxford leather and tarpaulin, with a bright future. PE heat shrinkable film is widely used in the whole collection packaging of wine, cans, mineral water, various beverages, cloth and other products. The product has good flexibility, strong impact resistance, tear resistance, not easy to be damaged, not afraid. The tide and shrinkage rate are large.

PVC heat shrinkable film PVC polyvinyl chloride, with added ingredients to enhance its heat resistance, toughness, and ductility. The uppermost layer of this surface film is lacquer, the main component in the middle is polyvinyl chloride, and the lowermost layer is a back-coated adhesive. It is a well-loved, popular and widely used synthetic material in the world today. Among the materials that can produce three-dimensional surface films, PVC is the most suitable material. Due to the unique properties of PVC (rain, fire, antistatic, easy to form) and PVC low input and high output, it is widely used in building materials industry and packaging industry. Therefore, PVC film has high transparency, good gloss and shrinkage. High rate and other characteristics.

POF heat shrinkable film POF is the meaning of heat shrinkable film. POF is a multi-layer co-extruded polyolefin heat shrinkable film. It uses linear low density polyethylene as the intermediate layer (LLDPE) and copolypropylene (pp) as the inner and outer layers. It is plasticized and extruded by three extruders, and then processed by special processes such as die forming and bubble inflation. POF is a heat shrinkable film mainly used for packaging regular and irregular shapes. Due to its non-toxic environmental protection, high transparency, high shrinkage, good heat sealing performance, high gloss, toughness, tear resistance, Uniform heat shrinkage and suitable for automatic high-speed packaging, it is a replacement of traditional PVC heat shrinkable film, widely used in automotive supplies, plastic products, stationery, books, electronics, circuit boards, MP3, VCD, crafts, photo frames, etc. Products, toys, pesticides, daily necessities, food, cosmetics, canned drinks, dairy products, medicine, cassettes and videotapes.

7 questions to pay attention to using hydraulic hose

     As a common type of hose, hydraulic hoses are used in many places, but how do you know how to use rubber hoses correctly? The following is a professional hydraulic tube manufacturer to explain the common problems of using hydraulic hoses. .

     1. The hydraulic tube expands and contracts with its internal pressure. Cut the hydraulic tube to a length slightly longer than you need.
     2. Please use it under the condition of hydraulic bending radius, otherwise it will cause the rubber tube to break and reduce the pressure resistance.
     3. The hydraulic pipe contains metal parts. Do not use it when the end is bent.
     4. Do not directly touch the hydraulic pipe to the open flame. Do not press the hydraulic pipe with the vehicle.

     5. Always use hydraulic hoses within the recommended temperature and pressure ranges.
     6. When applying pressure, please slowly switch any valve to avoid impact pressure.

     7. When using powder or granules, it may cause wear and tear according to the conditions. Please enlarge the bending radius of the hydraulic pipe as much as possible.