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型材在加工使用中不及木材方便,而且还很脆、刚性差、易老化。为提高型材的使用性能,需要进行如下改进:1.选择优良的材料及合理的配方;2采用先进的成型设备和拼装加工技术,提高制品质量和生产效率,降低成本。型材的耐老化性不仅取决于使用条件和配方选择,而且还取决于成型加工方法,即加工过程中的热历程和耐老化性能的损耗。国外采用双螺杆挤出机成型的好处就在于在较低的温度下和较短的时间内在使用少量稳定剂的条件下制得型材,这样既能降低成本,又能延长老化寿命。3.改进中空
Profiles are not as convenient as wood during processing, but they are also brittle, poor in rigidity, and prone to aging. In order to improve the performance of the profile, the following improvements are needed: 1. Selecting good materials and reasonable formulas; 2. Adopting advanced forming equipment and assembling technology to improve product quality and production efficiency and reduce costs. The aging resistance of a profile depends not only on the conditions of use and the choice of formulation but also on the method of forming, ie the thermal history during processing and the loss of aging resistance. The advantage of using twin-screw extruder molding in foreign countries lies in the fact that at a lower temperature and in a shorter period of time, a small amount of a stabilizer is used to obtain the profile, which can not only reduce the cost but also prolong the aging life. 3. Improve the hollow