Die cutting processing technology and troubleshoot

Jelly cup membrane die cutting processing technology and troubleshooting (Part 2)

I Special jelly cup membrane die-cutting plate

1. ordinary die-cutting plate

ordinary paper die-cutting process is the process of rolling, cutting and forming printed matter by using die-cutting plates arranged by die-cutting knives, indentation steel wires, etc. under the effect of pressure, PEKK materials with 3D printing are used in the field of aerospace and industrial utilization for the first time. The production of die-cutting plate (commonly known as row knife) refers to the use of die-cutting knife. The indentation steel wire and sponge strip are assembled on the die-cutting plate according to the specified requirements

2. Jelly cup membrane die-cutting plate

sla-230 film rolling sealing machine is equipped with a die-cutting plate cast directly on the steel plate, which can resist dozens of tons of pressure, wear resistance and long service life. Generally, it only needs to be replaced once a year. At present, most of the products used in China are imported from Japan. In order to ensure the beauty of the cup membrane after die cutting, the knife edge is often designed into a serrated shape, fixed on the upper template, and the roll membrane is punctured and then cut by using a certain punching pressure. The utility model has the advantages of small wear, small working pressure and small offset position. The disadvantage is that the cutting edge is uneven, and the knife edge is prone to notch, resulting in continuous film cutting. The strength of the die-cutting knife is required to be greater than the strength of the die groove. At the same time, it should also have a certain toughness to prevent the knife from breaking when it touches the die groove. The gap control between the die cutter and the bottom of the die groove must be paid attention to. The use specification is 0.05-0.50mm, which can be adjusted according to the sensitivity required by die cutting. According to the size of the die-cutting plate, the price of this casting die-cutting plate is between 2000-3000 yuan

II Different from paper, jelly cup membrane material

jelly cup membrane material is generally composed of a printing layer and a heat sealing layer. The jelly cup membrane material arriving at sla-230 film sealing machine (9) the brush layer has been printed with the designed pattern in advance; the heat sealing layer is mainly used to complete the bonding process with the cup body under the action of high temperature. The special high-grade jelly cup membrane material is composed of three layers, namely, the printing layer, the bonding layer and the heat sealing layer. Therefore, the thickness of the cup membrane material is relatively large.

the jelly cup membrane requires high hardness to prevent wrinkling and has a certain high temperature resistance. The stiffness is also required to be high to ensure that in the die-cutting process The middle cut is complete to avoid adhesion., Generally, the materials used for hot and cold drinking cups or bowl covers can be selected: pp.pe.ps, EPS, PSP, pet, PVC and aluminum foil composites, while nyadler believes lon is commonly used for making cup film. PL, PS, PP, aluminum foil film, tear film, composite film and other reel materials

III Key points of jelly cup film heat sealing and die cutting process

1. Process

after the equipment is started, the PLC controller sends instructions to the motor, and the motor drives the template to run forward for a stroke and then stops. At the same time, PLC sends instructions to the upper template (including mutual cooperation, including feeding, filling, heat sealing and die cutting), and the feeding, top cup and filling mechanisms start to work and complete feeding and other work; The unwinding mechanism of the die-cutting machine begins to release the coiled material that has been printed with pictures and texts. The unwinding principle of the coil is the same as that of the printing process. There are also tension control devices and electric eye scanning tracking. Because the heat sealing template and the die cutting template are fixed during the die cutting process, when there is a deviation between them, it depends on the pulse sent by the electric eye; Adjust the position of the roll film. When the position is appropriate, the heat sealing film and die-cutting knife fall down to complete the heat sealing and die-cutting process. Then, the heat sealing film and die-cutting knife are lifted, and the cylinder piston (which controls the up and down movement of the upper template) rises to the top and then pushes the sensor. At this time, the sensor will feed back the pulse signal to the PLC controller, which will control the start of the next stroke

2. die cutting speed

the sla-230 film rolling sealing machine mentioned in this paper has a die cutting speed of 800 times/hour, and can seal multiple cups each time, with high work efficiency. (to be continued)