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what are the applications of flat mouth circular knives in the plastic industry
the core of the flat mouth circular knife in the plastic industry is high-speed precision cutting smooth and burr free cutting, covering the entire process of film, sheet, pipe, composite material and recycling granulation, suitable for soft/hard/foam plastics, and is the main tool for mass production.sources：k8凯发旗舰 | publishdate：2026.05.06
1、 plastic film/soft roll slitting (mainstream)
packaging film: bopp, pet, pe, pvc film slitting, used for food/daily chemical packaging, with smooth cuts without burrs, adhesion, or stretching deformation.
soft pvc/pe: wire and cable insulation layer, medical soft film, greenhouse film cutting, high-speed (300m/min) cutting, tolerance ± 0.01mm.
composite film: aluminum plastic composite film and paper plastic composite film are cut without delamination or delamination between layers.
functional film: optical film, release film, protective film cut, dust-free, scratch free, suitable for the electronics/photovoltaic industry.
2、 plastic sheet/board cutting
hard sheet: pp, pe, pvc, abs, acrylic sheet (0.5-5mm) cutting, used for vacuum forming, printing, building materials, with vertical cuts, no broken edges, and no whitening.
foamed plastic: eva, pearl cotton, pu foam slitting, shockproof packaging materials, no fragmentation, no delamination.
geotextile: hdpe geomembrane, waterproofing membrane cut, used for infrastructure/water conservancy projects, weather resistant and wear-resistant, continuous cutting stability.
3、 plastic pipe/profile cutting
thin walled pipes: pvc, pp, pe plastic pipes (diameter ≤ 110mm) cut to a fixed length, for water supply and drainage/line pipes, with a smooth cut, no burrs, and no flattening.
irregular profiles: cut plastic door and window profiles, cable trays, and sealing strips, adapt to extrusion line online cutting, with a regular cross-section and correct size.
4、 plastic composite and component processing
plastic tape: pet, bopp, pvc tape slitting, precise slitting before die-cutting, smooth edges without warping.
woven bag/non-woven fabric: plastic woven fabric, non-woven fabric cutting, used for bag making/home textile, cutting cleanly and without drawing threads.
injection molded part gate cutting: small injection molded parts (such as bottle caps and pipe fittings) gate/flash flat cutting, replacing punching and shearing, with no burrs and high efficiency.
5、 plastic recycling and granulation
waste film/silk shredding: recycling pe/pp film and pre shredding chemical fibers for easy cleaning and granulation, with wear-resistant and anti adhesive blades.
cutting of scraps: cutting of scraps from sheet/pipe production, recycling and reuse, compatible with automated recycling lines.
core advantages (plastic processing adaptation points)
excellent incision quality: flat blade design, no burrs, no broken edges, no adhesion, reducing post-processing polishing.
high speed and efficiency: with the help of a slitting machine, the speed can reach 300m/min, suitable for mass production lines.
wide material adaptability: high speed steel/alloy steel/skd11 material, suitable for soft/hard/foam plastics, wear-resistant and not easy to break.
low cost: can be repeatedly ground and reused, has a long lifespan, and is easy to maintain.
common materials and selection references
soft film/thin material (≤ 1mm): high speed steel (skh51/w6), thin cutting edge, sharp and wear-resistant.
hard piece/thick material (1-5mm): alloy tool steel (9crsi/cr12mov), thick cutting edge, impact resistance.
foam/adhesive plastic: surface coating (tin), anti sticking and friction reducing.