1, too much filler, due to the current market price of low profile, raw material prices are rising, many manufacturers are cutting prices to proceed on the cost. While the regular profile manufacturers are not under the premise of reducing the quality of the formula through the optimization of the combination to reduce the cost; some manufacturers are in reducing costs while also reducing the quality of products.

2, the number of impact modifiers and the addition of species, under the action of stress, impact modifier can improve the total energy of PVC rupture. At present, CPE, ACR, MBS, abs, EVA and so on are the main varieties of hard polyvinyl chloride impact modifier, in which CPE, EVA, ACR modifier molecular structure does not contain double bonds, good weather resistance, Suitable for outdoor building materials, they blended with PVC, can effectively improve the impact resistance of hard polyvinyl chloride, processing, weather resistance and in a certain range to improve the welding angle strength.

3, the stabilizer too much or too little, the role of stabilizer is to inhibit degradation, or with the release of hydrogen chloride reaction and to prevent the discoloration of PVC processing. The amount of stabilizer will also affect the impact strength of the profile, too much or too little will cause the profile strength caused by the phenomenon of brittle profile.

4, the amount of external lubricant too much outside the lubricant and resin compatibility is low, can promote the sliding between the resin particles, thereby reducing the friction heat and delay the melting process, the role of this lubricant in the early processing process (that is, The external heating and the internally generated frictional heat make the resin completely melted and the resin is lost in the melt before the identification feature) is the largest.

5, hot mixing order, the temperature set value and curing time on the performance of the profile also has a decisive factor

PVC-U formula a lot of components, the choice of feeding order should be conducive to play the role of each additive, and is conducive to improving the dispersion rate, and to avoid its poor synergies, additives, feeding order should help to improve Agent to complement the effect, to overcome the role of phase g to eliminate, so that should be dispersed in the PVC resin additives, fully into the PVC resin inside.

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