Medical PVC granules have certain requirements on the production environment, the formula is also more stringent, because the medical granules standard in the detection of easy oxidation, biological solubility and drug compatibility have strict requirements.
Medical PVC granules are generally 65-100A hardness is the main, commonly known as soft PVC, soft PVC granules generally use a single-screw or double-order masterbatch production is better, mainly to facilitate the plasticization of PVC pelleting, does not produce crystal points and pitting.
But many manufacturers are still using the formula before 1995, in fact, before 1995, the formula of a benzene diisooctyl phosphite is a toxic product or low-toxicity products, has been far from conducive to human health. So this raw material should be replaced with more environmentally friendly non-toxic phosphite is better.
PVC raw material selection, the general choice of polymerization degree of 1000 or 1300 number of ethylene method is better, vinyl chloride monomer content will not exceed the standard. There are also many are using calcium carbide PVC in the production of medical materials, calcium carbide method is cheaper, but vinyl chloride monomer is easy to exceed the standard.
The choice of stabilizers, medical PVC generally choose medical-grade calcium and zinc heat stabilizers, lubricants are also generally to choose medical-grade.
Related production equipment is also needed for high-speed mixer, low-speed mixer, cutting grain cooling equipment. If the annual output of 1,000 tons of medical PVC pellets, according to the annual production of 300 days a year, the production capacity of 4 tons per day can be, two 120 single-screw or two 65 double-order flat double extruder can meet its production capacity. Such equipment is about 18-25 million between. Plus high and low mixer about 50,000, the main equipment investment between 30-35 million. The rest is the purchase of raw materials, raw material turnover, capital turnover.
4 tons a day, 120 tons a month, in the current situation of such financial transactions and payment of goods, a month at least 1.5 million yuan of working capital, of course, if your customers can pay when the goods are delivered, your pressure will be much smaller.