Film blowing machine screw barrel
The screw consists of a thread and a cylinder. The tail of the screw is installed in the thrust bearing to prevent the reaction force from being pushed out during extrusion. The diameter of the screw is slightly smaller than the inner diameter of the steel sleeve of the fuselage, that is, there is a gap between the diameter of the screw and the inner surface of the steel sleeve, and the gap is generally controlled at 0.002 to 0.004 times the diameter of the screw. Too small clearance will cause the "screw" of the screw, causing wear, and even the phenomenon of stuck screw; too large clearance will affect the amount of rubber backflow, low production efficiency and product quality.
Product parameters of screw barrel of film blowing machine :
Alloy composition: tungsten carbide, nickel-chromium alloy ◆ Nitride depth: 0.5-0.8mm
◆ Nitriding hardness: HV≥950
◆ Nitride brittleness: ≤ 2nd level ◆ Surface roughness: Ra ≤0.4um
◆ Straightness: no more than 0.015mm
◆ Dual alloy hardness: HRC55-62; barrel alloy length is more than 600mm, using a unique process, the alloy layer is inlaid firmly and does not fall off.
◆ Dual alloy depth: ≥2mm
Application: Single screw extruder screw types and uses: ordinary type, progressive type, abrupt type, mixing type, separation type, pin type, exhaust type, barrier type, split type, wave type, acceleration type and above Suitable for spinning, granulating, drawing, blown film, extruded header, foamed, extruded sheet, extruded board, etc.
38CrmoALA ），经过可调质定性、表面氮化、抛光等工艺精工制作，具有精密耐磨之特点。 The material of the product is made of high-quality gold-containing steel ( 38CrmoALA ), which is precision-made by adjustable quality and qualitative, surface nitriding, polishing and other processes.
Tips: In order to avoid purchasing risks, it is recommended that you confirm the supplier's qualification and product quality before purchasing the product.