How UPVC Windows And Doors plastic-steel profiles are produced
As an energy-saving material, plastic-steel profiles have inherent advantages. Non-metallic materials themselves have poor thermal conductivity, which makes plastic-steel profiles low in thermal conductivity. It is easy to achieve low heat transfer coefficients when making doors and windows. It is an ideal energy-saving material. .
Due to the use of plastic-steel profiles with low heat transfer coefficients, plastic-steel windows have obvious cost advantages in achieving high energy-saving effects. In the northeast and other places, the weather is cold and in order to save energy, a large proportion of plastic-steel windows are used, and the market share of plastic-steel windows is very high. The configuration of the window uses more than 70 cavity profiles, with three glass and two hollow LOWE glass, and three sealing systems. The K value is also relatively easy. Because plastic-steel windows can achieve high energy-saving features at a lower cost, plastic-steel windows still occupy a certain market.
How are plastic-steel profiles produced? The production of plastic-steel profiles goes through the processes of batching, mixing, extrusion, cooling and shaping, traction cutting, inspection, and packaging.
The plastic-steel profile is a kind of hard polyvinyl chloride polymer plastic first to complete the batching process. After the formula is determined by the R&D department, the batching process completes the work. The batching process has automatic production lines and manual completion. The composition of the formula is composed of more than ten kinds of materials such as PVC, heat stabilizer, filler, lubricant, processing aid, light stabilizer and pigment. There are specific requirements for each material and cannot be used indiscriminately.
Titanium dioxide is a commonly used raw material. There are two types of titanium dioxide: rutile type and anatase type. If rutile type is used, anatase type cannot be used. The price of anatase type is low, but the produced profiles are prone to six The phenomenon of dark moon. Due to the requirements of environmental protection, the formula should use lead-free heat stabilizers to meet the requirements of environmental friendliness and human health.
In the mixing stage, various raw materials measured in proportion are added to the mixer in a certain order. Pay special attention to the order of addition, which affects the quality of the mixture. The foreign plastic-steel profile industry is relatively complete, and there are special companies that produce mixtures. In this regard, domestic production is basically the whole production process, and there is no company specializing in selling mixed materials in the market. The feeding sequence of each raw material affects the quality. The time, temperature, and rotation speed of the mixture in the mixer will affect the quality of the mixture. If a company has insufficient technical strength, the inherent quality of products cannot be effectively guaranteed.
The mixed materials go through the extrusion line to complete the molding of the product. The extruder is the key production equipment. There are many types of extruders: single-screw and twin-screw; in the type of twin-screw extruder, there are conical twin-screw and parallel twin-screw. Choose the appropriate screw extruder according to different requirements. The principle of the screw extruder is to use the external heating and the shear force of the screw to the material to make the powder of polyvinyl chloride (PVC) into a molten state after plasticization.
Profile extruder is a common equipment in industry. The wires we usually see are also extruded. The screw, a key extruder component, can be seen on many devices. Screws can be seen in equipment such as dough mixers and injection molding machines. The extruder is mainly composed of screw, motor, control system, vacuum system and so on. The processing accuracy of the extruder is a key technical indicator.
The fully plasticized and molten polyvinyl chloride material is formed into the required shape through the mold, and then enters the vacuum setting mold, and is cooled by the circulating water to form the required shape. Through the pulling force of the tractor, the profiles are continuously pulled out from the die, and then reach the fixed-length cutting process, which is cut into profiles of a certain length, generally 6 meters in length. After the mold is preheated, pay attention to tightening the high-strength bolts.
The speed of the profile in the shaping die matches the extrusion volume, neither too fast nor too slow. Too fast will easily make the wall thickness of the profile too thin and the product quality will be affected; if it is too slow, the material coming out of the die cannot be removed in time. If it is pulled away, the material will gather in the die head, resulting in a mold blocking accident, resulting in production stoppage.
The material pulling speed, water temperature and vacuum degree of the cooling and shaping process are the key production parameters. The temperature of the cooling water for the profiles must be guaranteed. If the temperature of the cooling water cannot be guaranteed, it cannot be produced normally, and various problems will occur in the product. Especially in summer production, if the material that comes out of the die head is about 200 degrees Celsius, if it cannot be cooled enough in time, even normal production cannot be guaranteed. Needless to say, the internal force of the material will affect the quality of the product.
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