عربىThe screw on the injection molding machine often sticks to the material.
① Different plastics, because of their melting speed, the heat absorbed during melting, melt viscosity, water absorption, thermal stability and other characteristics of the difference in the shape of the injection molding machine plasticizing screw requirements are very different.
② Even if the same plastic, because the products are different, the plastic added flame retardants, lubricants, glass fibers, inorganic minerals and other modifiers and fillers are different, or the requirements of the color mixing, melt homogenization requirements are different, the shape of the particles are not melted differently, there are different requirements for the screw.
The reason why the screw on the injection molding machine often sticks to the material.
③ The reason for the breakage of the non-return ring: generally the manufacturing process of plastics such as PA + fiber material wear and tear is more serious, and the material has a relationship with the production, such as glue shot to the end of the increase in the amount of melting or so are generally broken non-return ring, non-return ring rupture will be accompanied by a serious phenomenon of return to the rubber, glue, glue injection are not normal. The stop ring is too thin, and the raw material exhausts not punch points.
④ Plastic particles are too large, resulting in a bridging phenomenon, the plastic can be crushed again.
1, The screw barrel under the material port blockage, check whether the melted plastic block bonded here.
2, Temperature control is not accurate, the back end of the barrel is too hot.
3, Screw and barrel wear, resulting in plastic leakage, not to the front of the barrel delivery.
4, The screw appears to wrap the rubber phenomenon (i.e., the material wrapped around the screw) together with the rotation.
⑤ If the cause of the injection molding machine screw slippage is caused by sticky material, but also may be the check valve (check valve) is not working properly. When the rod is rotating, and ready for injection, the retaining ring should be at the front end (open position), in contact with the cam buckle of the retaining ring holder. If the retaining ring is at the end (i.e., closed position).
⑥ If or is located midway between the end and the retaining ring holder, it will be difficult for the polymer melt to pass through this gap. If the retaining ring is found to be defective, it should be replaced promptly. If it has reached the end of its service life, it should be replaced in time to avoid damage to other parts.
