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Chlorinated Polyethylene Extrusion Process Common Problems

Weifang Yaxing Chemical Co.,Ltd | Updated: Aug 22, 2017

Chlorinated Polyethylene Extrusion Process Common Problems

In the process of Chlorinated Polyethylene extrusion, the problems encountered can be classified into four categories, one is the stability problem; the second is the melt strength problem; the third is the lubrication problem; four is the dispersion problem. These four types of problems, especially the first three types of problems will be mutual constraints, cross-impact, from the surface phenomenon is sometimes difficult to immediately clear, to observe the analysis, find the root causes of the problem can be solved.

Lack of stability, will affect the entire board, the board yellow, Chlorinated Polyethylene brittle.

Insufficient melt strength will cause the foam cells to be large, and the longitudinal section is so long. To determine whether the melt strength is insufficient, the most direct way is to press the three rollers behind the roll on the roll in the sheet, the melt strength can feel flexible when pressed. If it is difficult to bounce after pressing, indicating poor melt strength. Because the screw structure and cooling methods vary widely, it is difficult to determine whether the temperature is reasonable, in general, in the extruder to allow the load, 3-5 area temperature is low as well.

In the Chlorinated Polyethylene in order to obtain foam uniform products, but also need to ensure that PVC material has a good melt strength. The company developed the foam additives is to solve the problem of foam products developed, can effectively improve the quality of Chlorinated Polyethylene.

Poor dispersion will bring the surface of the plate is not smooth.

Process temperature control problem: The above four issues are fundamental, is the basis of deep-seated problems. Compared to the above four issues, process temperature control will be much more intuitive, is the surface problem, but the temperature control is not good, will lead to the emergence of fundamental problems. Improve the processing temperature, material stability time will be reduced, the stability problem; the original lubrication balance will be broken, the general performance of the external lubrication is insufficient, especially after the late lubrication, need to increase the amount of external lubrication; The melt strength decreases, the Chlorinated Polyethylene cell increases, the number of cells decreases, the sheet is brittle and easy to break; the increase in temperature reduces the melt strength also reduces the melt viscosity, the viscosity decreases the shear dispersibility, The ability of the screw is not strong, sometimes there will be scattered uneven.

Chlorinated Polyethylene is the problem: (1), the amount of gas is small, generally only inorganic foam blowing agent 15% -30%, large amount of residue, including water and volatile substances, sometimes odor And the surface of the frost: (2), the decomposition of the heat decomposition of large, difficult to remove, especially in the case of large wall thickness of the product, the internal plastic will overheat and decomposition, reduce performance; (3), almost all foaming agent Is a flammable, low decomposition temperature, storage and use should be careful.

Chlorinated Polyethylene is the use of advanced production technology of foam technology, the use of advanced scientific formula to high-pressure polyethylene, flame retardants, foaming agent, crosslinking agent and other raw materials blended, after mixing, Polyethylene through the chemical bridge of the high rate of foam, and become a network of polymer structure, balanced perforated bubble products.

The density of Chlorinated Polyethylene is small and the melting temperature is low.

Chlorinated Polyethylene: more than half for thin film products, followed by pipe, injection molding products, wire wrapping, etc., low-pressure polyethylene: injection molding products and hollow products.

Chlorinated Polyethylene: Due to the excellent performance of UHMWPE, it can be used as an engineering plastic.