Wuhan Handern calendering process
DATE：2020/7/15 8:41:44 / READ： / SOURCE：This station
Wuhan Handern calendering process
1. Process flowWith the high-speed and automated process of calendering, various special production lines that can adapt to different calendered products have been developed, such as soft polyvinyl chloride film technology; hard polyvinyl chloride film technology; calendered film technology that can simultaneously compound films or other textiles ; PVC-asbestos floor tiles C art, etc. www.handern.com non-woven equipment
2. Recipe
(1) Principle of formula design. In addition to the two general principles of formula design for rolling formulation design, such as satisfying the physical and mechanical properties of the product and process performance, and meeting the resource and price constraints, we must carefully select each component based on the characteristics of the rolling process And cooperate. www.handern.com Non-woven equipment
① Polyvinyl chloride resin with high resin molecular weight and low dispersibility is undoubtedly beneficial to improve the physical and mechanical properties of products. But the higher the molecular weight, the higher the required processing temperature. Therefore, the choice of resin grade should not only take care of product quality, but also the convenience and possibility of processing. Generally, the soft film can be selected from resin, and sometimes used. Hard and thin, thin or V-shaped resin is available. www.handern.com Non-woven equipment
②The plasticizer is within a certain range, the more plasticizer, the lower the material viscosity, the better the processing technology. The total amount of anti-rolling agent for calendered film is generally controlled at 48-52%. The large heat consumption of DBP will reduce the heat resistance and light resistance of the curtain film and shorten the service life of the film, which is usually not used abroad. The resin with poor plasticization performance still needs to be used in a small amount. Particular attention should be paid to the number and variety of plasticizers used in raincoat films and agricultural films. Transparent products generally use cadmium soap; opaque use lead barium soap. www.handern.com Non-woven equipment
③ The stabilizer should pay attention to the precipitation problem, that is, the surface of the roller is covered with a layer of wax, and the higher the temperature, the more serious the precipitation. The reasons for precipitation are: 1) Improper selection of stabilizer and poor compatibility with resins and additive systems; 2) Stabilizer molecules are mostly polar and non-polar, this molecular structure has affinity for metals: 3 ) The ratio with other components such as pigments, lubricants, etc. is not appropriate for the folding out of the stabilizer. The following items should be noted when formulating the design. 1) Use appropriate stabilizers. Generally speaking, the higher the positive polarity of the polar gene in the stabilizer molecule, the easier it is to form a wax. Generally, barium has a high electropositivity and a small amount of cadmium, and the barium cadmium stabilizer with the predominant content is usually used in the small zinc formula. If the requirements are still not met, a small amount of zinc stearate can be added. 2) The filler that attracts stronger metal soaps. 3) Add acidic lubricant. Such substances have a stronger synergistic effect on metals, protect and lubricate metal soaps, and stearic acid is usually added. Cadmium lubricant should not be too much, so as not to affect the printing and welding performance. www.handern.com Non-woven equipment
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