The purpose of filtration in plastics processing
Our offer includes square mesh and non-mesh nets, made of different types of steel, single or multi layer (multiple layers improve homogenization of the plastic). Melted plastics and their solutions contain various pollutants of different sizes. These pollutants include: substances from: catalytic agents, wear of mechanical parts, separated and burnt residue from between the cylinder and the screw, corrosion etc. However, most of the pollutants are found in regranulated material and additives, such as: dyes, colorants and fibres. The following are also considered pollutants in plastics: partially polymerized plastics, unmelted granulated products and deformable gels. The above pollutants should be eliminated or separated from the plastic, since they:
- lower the quality of the final product
- lower the imperviousness and quality of the film
- lower the electric strength in cable tubes
- decrease the durability of fibres and films and other products
- increase the coarseness of surfaces
- accelerate material aging
- decrease visual properties (colour)
- influence the wear of such parts as: nozzles, melt pumps etc.
Range of application
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The proper choice of the net is crucial to the production process. This is why the outcome and the effect of the size should be clearly defined. Do not forget to clearly specify:
- range of application
- filtration precision
- production process conditions (temperature, pressure, etc.)
- chemical and mechanical requirements
- any further procedures applicable
By thoroughly analyzing the above data, you can choose the most suitable parameters of the net: mesh, weave, open space, stability and material.
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