In recent years, domestic PVC raw material prices have risen sharply. However, due to the current oversupply of plastic doors and windows in the market, the prices of plastic profiles and doors and windows have been declining. Most manufacturers are in a state of loss. The only effective way out for the plastic door and window companies is through the development and application of new high-efficiency, low-lead, non-toxic, anti-bacterial formulation aids to replace the original inefficient, toxic formulation additives, improve product performance, file times, and form different Characteristic products, thus pulling away from the price, to meet the needs of different climate areas, different levels of construction and consumer groups.
In severe cold and cold regions, impact modifiers should be appropriately increased or new impact modifier ACR should be used instead of the original impact modifier CPE to improve the impact resistance of plastic profiles.
In areas with high heat and UV radiation intensity, the dose of titanium dioxide and UV absorbers should be appropriately increased to improve the anti-aging properties of plastic profiles.
In high-rise buildings in the coastal areas, A, B type wall thickness (2.8mm or 2.5mm), profile with large cavity should be used to improve the wind and pressure resistance of plastic doors and windows.
Lead-free or low-lead formulations such as calcium zinc zinc or organotin stabilizers are used to replace lead salt formulations to meet and enhance the environmental awareness needs of some consumer groups. At present, strictly limiting the lead content of products has become a basic national policy of many developed countries. China still has a considerable gap in this regard and efforts should be made to improve it.
In recent years, two breakthroughs have been made in the study of calcium carbonate applications: First, the use of fatty acids and various coupling agents to treat the surface of calcium carbonate to improve its surface activity and affinity with PVC molecules; The calcium particles are refined to increase their compatibility and dispersibility with PVC molecules. The development and production of activated fine calcium carbonate and nano-calcium carbonate, under the premise of guaranteeing various physical and chemical properties of plastic profiles, provide a certain space for reducing raw material costs.
step Drill Bit is a drill bit that has the tip ground down to a different diameter. The transition between this ground diameter and the original diameter is either straight, to form a counterbore, or angled, to form a countersink.
The advantage to this style is that both diameters have the same flute characteristics, which keeps the bit from clogging when drilling in softer materials, such as aluminum;. Most of these bits are custom-made for each application, which makes them more expensive.
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