Introduction and production process of PVC sheet

First, Brief introduction of PVC sheet

1. According to the color, it can be divided into natural color films, slightly blue films, and various colored films;
2. According to transparency, it is divided into transparent sheet, semi-transparent sheet and opaque sheet;
3. According to the surface treatment, it can be divided into light film, frosted film (thickness), single and double film, matte white (black);
4. According to the grade, it can be divided into new materials and ordinary new materials;
5. According to the function, it can be divided into anti-static film and anti-ultraviolet film;
Product specifications: calendering line thickness 0.15mm-0.55mm, width ≤680mm
Extrusion line: thickness 0.18mm-3.0mm, width ≤1300mm
Product features: wide application, flame retardant and self-extinguishing, high quality and low price. At present, it is widely used in various industries such as tools, fishing gear, toys, electronics, medical packaging, clothing and other industries such as blister, paper box, packaging, printing, card making and other fields. PVC material has good processing performance, low manufacturing cost, corrosion resistance, insulation and other good characteristics.

Second, the processing flow of PVC sheet
PVC resin conveying system → batching process → high-speed mixer → cooling high-speed mixer → extruder → double-roll mill → calendering unit → peeling roll → embossing roll → cooling roll → thickness measuring device → coiler → making Taste
1. Material mixing: first add PVC resin, stabilizer, and internal lubricant to a high-speed mixer, stir to 80-90℃, add processing aids and impact modifiers, continue to heat up to 100-105℃, add lubricants, Colorants, etc. After stirring evenly (120°C), complete the mixing and discharging to the cooling mixer. When stirring and cooling in the cooling mixer to below 40°C, the material is discharged into the hopper of the extruder.
2. Extrusion process
Barrel temperature 110-140℃
Screw temperature 100-130℃
This process is the main plasticization process, and good plasticization must be ensured. The ideal state is a long strip, if it is a sticky mass, it is not conducive to exhaust, and the product is prone to produce bubbles. If there is powder, it will bring difficulties to the process of plasticization and easy to appear crystal points.
3. Two-roll mixing
Temperature 170-190℃; roll gap 2-4mm
Two-roll to four-roller feeding, the material should be well plasticized, and the surface should be bright without air bubbles.
4. Four-roller temperature and speed
Roller 1: 185-200℃ 8m/min
Roller 2: 190-205℃ 9.5m/min
Roller 3: 195-210℃ 12m/min
Roller 4: 183-195°C 12m/min
The lubricant added when the temperature is raised to 100-105°C during mixing is mostly PE wax, and the quantity and quality of the lubricant added with paraffin wax and oxidized wax (OPE wax) are few. Adding too much product may cause precipitation, whitening frost on the surface, less and not conducive to plasticization, and poor lubricating effect; if the melting point of the added PE wax is too low, the quality of the product is too low, and the lubricant will be used when the processing temperature rises. It will become unstable, migration and precipitation will occur, and even direct volatilization will have little effect. The ST600 slippery powder developed by Anmi Micronano's technical team, due to its spherical hollow structure, improves the surface energy of the sheet, can solve the phenomenon of lubricant precipitation, and can also improve the ink absorption performance of the sheet and improve the product Competitiveness.