As an energy-saving material, uPVC Profile has inherent advantages. Non-metallic materials have poor thermal conductivity, which makes the thermal conductivity of plastic steel profiles low. It is easy to achieve low heat transfer coefficients when making doors and windows. It is an ideal energy-saving material. .
Because plastic steel windows use plastic steel profiles with low heat transfer coefficients, they have obvious cost advantages in achieving high energy-saving effects. In the northeast and other places, the weather is cold 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 window configuration uses more than 70 cavity profiles, with three glass and two hollow LOWE glass, and three sealing systems. The heat transfer coefficient of the whole window can easily achieve 1.5 W/m²·K, even if it is a passive window of 0.8 W/m²· The K value is also relatively easy. Because plastic-steel windows can achieve high energy-saving characteristics at lower costs, plastic-steel windows still occupy a certain market.
How is uPVC Profile produced? The production of plastic steel profiles goes through the processes of batching, mixing, extrusion, cooling and shaping, traction cutting, inspection, and packaging.
uPVC Profile is a kind of hard polyvinyl chloride polymer plastic that first completes the batching process. After the formula is determined by the R&D department, the batching process completes this work. The batching process has an automated production line, or it is done manually. The composition of the formula is composed of more than ten materials such as PVC, heat stabilizer, filler, lubricant, processing aid, light stabilizer, and pigment. There are specific requirements for each material, and it should not be used indiscriminately.
Titanium dioxide is a commonly used raw material. There are two types of titanium dioxide: rutile type and anatase type. If you want to use rutile type, you cannot use anatase type. The price of anatase type is low, but the profile produced is easy to appear. The phenomenon of moon darkness. Due to the requirements of environmental protection, the formula must use lead-free heat stabilizers to meet the requirements of environmentally friendly 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, the order of addition affects the quality of the mixture. The plastic-steel profile industry abroad is relatively complete, and there are specialized companies that produce mixtures. In this regard, domestic production is basically the whole production process, and there are no companies that specialize in selling mixtures on the market. The feeding order of each raw material affects the quality. The time, temperature, and speed of the mixer in the mixer will affect the quality of the mixture. If a company does not have enough technical strength, the inherent quality of the product cannot be effectively guaranteed.
The mixed material passes through the extrusion line to complete the product molding. 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, it is divided into conical twin-screw and parallel twin-screw. Choose the right screw extruder according to different requirements. The principle of the screw extruder is to use external heating and the shear force of the screw on the material to plasticize the PVC powder into a molten state.
Profile extruder is a common equipment in industry. The wires we usually see have also been extruded. The screw, a key component of the extruder, can be seen on many equipment. Screws can be seen in kneading machines, injection molding machines and other equipment. 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 completely plasticized and melted polyvinyl chloride material passes through the mold to form the required shape, and then enters the vacuum setting mold, and is cooled by circulating water to form the required shape. The profile is continuously drawn from the die through the pulling force of the tractor, and then reaches the fixed-length cutting process, and is cut into a certain length of profile, which is generally 6 meters in length. Pay attention to tighten the high-strength bolts after the mold is preheated.
The speed of the profile in the shaping die matches the extrusion volume. It cannot be too fast or too slow. Too fast will easily cause the wall thickness of the profile to be too thin and the product quality will be affected; too slow because the material from the die cannot be removed in time Pull away, the material will gather in the die head, forming a plugging accident, causing 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 of the profile must be guaranteed. If the temperature of the cooling water cannot be guaranteed, and normal production cannot be performed, various problems will occur in the product. Especially when the material that comes out of the die at about 200 degrees during the summer production, if the material cannot be sufficiently cooled in time, even normal production cannot be guaranteed. Needless to say, the internal force of the material will affect the product quality.
In order to control the water temperature, the manufacturers are equipped with refrigerators, cooling pools, cooling towers and other equipment to ensure that they produce qualified products. After the profile comes down from the production process, it must pass a stable time of at least 24H before it can be shipped. The profile from the production line is not completely cooled, and there is still a certain amount of change in size.