

Industrial slitting knives are important for resin material cutting, and the accuracy of slitting knives directly determines the value of products. Resin materials, especially PET and PVC, have high flexibility and hot melt. If they are not cut properly, it is very easy to cause burrs on the cut, material melting and sticking to the cutter, deformation and cracking. The quality of resin materials will directly affect the practical applications in packaging, automobiles, electronics, optoelectronics, and medical industries.
Slitting is to apply local high pressure stress to the slitting knives that exceeds the strength limit of the resin material, causing it to undergo plastic deformation, brittle fracture, and finally separation. The characteristics of the resin material will affect the actual effect of cutting. Tough resin (such as PE, PP): mainly undergoes significant plastic flow, elongation, stretching, and extrusion deformation. The material is "pushed away" by the slitting edge and accumulates in front of and on both sides of the cutting edge. Brittle resin (such as PS, PMMA): The plastic deformation area is very small, and it mainly depends on subsequent brittle fracture.

The front face (contact surface with the chip) and the back face (contact surface with the newly formed surface) of the cutting tool rub violently with the resin material. When the local temperature exceeds the melting point of the resin, the material softens or even melts. The molten material will adhere to the surface of the tool, causing sticking, burrs, rough surfaces, and accelerated tool wear. Glass fiber/carbon fiber materials have high hardness and high-speed friction, so you need to use a slitting tool with a hardness of more than (90HRA) to increase the service life.

ShenGong Tungsten Steel uses ultra-fine tungsten carbide particles (0.3-0.5μm) to enhance the hardness of the blade, design the cutting edge for different materials to ensure sharp cutting, and use TiN coating to reduce surface adsorption caused by friction. At the same time, measures can be taken according to actual working conditions.
For questions about slitting resin materials, please contact Shengong Tungsten Steel.
Gong Team: howard@scshengong.com
Post time: Jul-24-2025