[China Packaging Network] We all know that the stretch film trimming is very complete and uniform. Then, what are the characteristics of the stretch film cutting machine? After the stretched film is cooled from the cooling device, it needs to be taken up. Before the take-up, the width of the stretched film must be determined. This requires the product to be trimmed to remove the excess part of the edge. The wide dimension of the stretched film is determined, and at the same time, the "stretched neck" is produced due to the extruded stretched film (the film width is smaller than the head width). This will make the stretched film edge thicker and the edge must be removed to ensure the film roll. The ends are neat and flat.
Edge-cutting device: There are several types of edge-cutting devices, which can be divided into fixed-straight knife-type and rotary-disk-knife type. Keyways are provided on the tool holder and the shaft of the tool holder so that the tool holder can be slid left and right on the shaft.
1. Fixed straight knife type: Both ends of the arbor shaft bearing support, and equipped with hand wheel and worm gear. The left and right hand wheels are connected with the screw rods, and the hand wheels can be turned to move the left and right knife holders left and right. A scale is installed on the guide rod shafts, and the width dimension of the product after trimming can be determined by reading the indexing value on the ruler. The hand wheel is connected with the worm, the hand wheel is rotated, the worm drives the worm wheel and the support shaft rotates, and the angle between the cutter and the film can be adjusted. When the tool holder structure is working, the hand wheel is turned to move the blade blade downward and penetrates. The film slits the film. Rotate the upper worm wheel and adjust the hand wheel to adjust the blade and the stretched film plane to a certain angle, then tighten the set screw, fix the blade, keep it from the film, keep the current cutting depth and angle, and carry out continuous cutting. While working, there is a knife on the same knife holder, one knife on each side. When the knife is changed, it only needs to be launched. The old knife can be returned. This type of single-blade blade razor blade has a tip of 60. ° angle, the material is mostly special steel, but also the use of ceramic materials, the sharp edge of the knife is thin, mainly used to cut thin and have a certain toughness of the film. For example, cut a plastic film smaller than 30 μm.
2. Rotary disc cutter: For thicker plastic film or rigid film, it is necessary to use a circular knife. The wafer cutter is mounted on the shaft of the rolling bearing, and the blade film drags and rotates continuously. The cutters have good rigidity, fast heat dissipation, and very straight cuts. When cutting thicker films, the phenomenon of warping on both sides of the slitting product can be avoided.