Laser marking of POF heat shrink film_Application on easy-tear line

POF heat shrink film has high transparency, high shrinkage, high toughness, high heat sealing performance, high toughness, high heat sealing performance, and is a safe and reliable soft shrink film. POF is a heat shrink film with linear low-density polyethylene as the middle layer (LLDPE) and copolypropylene (PP) as the inner and outer layers. It is the most widely used and rapidly developing new environmentally friendly shrink film in the world. It is plasticized and extruded by three extruders, and then processed by special processes such as mold forming and film bubble expansion. This product adopts advanced degree, high shrinkage, high toughness, high heat sealing performance, antistatic, good cold resistance, safe and reliable soft shrink film.

POF is a biaxially stretched heat shrinkable polyolefin packaging film. This product requires very high force equipment. The process is the main factor affecting the performance of the product and complements each other. In the POF production process, the optical and heat sealing performance indicators of the product are mainly adjusted by controlling the temperature field and force field during the processing. POF production is a low-temperature cold-drawn biaxial stretching process, which requires low-temperature stretching, so the equipment should not be too large. If the equipment range is too large, the bubble stability is poor, the temperature control is high, the stretching speed is slow, and the product quality will be greatly reduced. Use small equipment, increase extrusion production, increase the pulling speed, the bubble stability is good, the temperature control is low, the stretching speed is fast, the product quality can be doubled, the equipment production, the process control is good, the output is not lower than that of large equipment, and the product quality performance is good. There are many types of heat shrink film, including POF heat shrink film, PET heat shrink film, PE heat shrink film, etc. Heat shrink film is widely used in major packaging fields, among which the food industry is the largest market for heat shrink film packaging, which can be used for various fast food, beverages, snacks, wine packaging, and agricultural and sideline product packaging. The heat-sealed packaging film of beverage bottles needs to be heat-shrunk to prevent the film from breaking. The heat-sealed label film U (back) of beverage bottles is easy to tear. During the shrinking process of the heat-sealed label film and the beverage bottle body, the holes on the heat-sealed label that are easy to tear will be affected by external forces, so the holes that are easy to tear should be accurately controlled during the labeling process. The aperture and depth of the tearing hole should be strictly calculated to avoid no rupture during the shrinking process.

Laser punchingThe method is to use a laser beam to evenly cut a thin line of only a few microns deep through solid lines, dotted lines, wave lines, and easy-tear lines. Due to the advantages of laser focusing, the focus point can be as small as the order of microns, so the material micro-processing is more favorable, and the cutting, marking, marking, and hole depth are controllable. Even at a lower pulse energy level, a higher energy density can be obtained, and material processing is effective. The laser equipment can be installed on a cutting machine or a compound machine. Laser technology can be used for cutting, marking, punching, and layer cutting on flexible packaging materials such as OPP, BOPP, PE, PET (polyester), aluminum foil, and paper.

The advantages of the laser marking machine punching method are as follows:

1. The punching precision is high, the spray hole is smoother, there is no burr around, and the burr is more uniform;

2. Using microcomputer control, the shape and size of the hole can be changed freely, and the use is more flexible;

3. Avoid the trouble of replacing punching molds and silicone plates, reduce costs and improve production efficiency.