Although the three-side sealing bag is the simplest bag type in the composite packaging bag, it is also tightly looped in the production process, which is sloppy.
1. Prerequisites for making three-side sealed bags:
Using the feeding frame, the iron rod is controlled to slide up and down through a cylinder, which is convenient for feeding, and the reel is locked with a screw. After loading, the film is tied with a low-pressure wide bag. The drum rotates counterclockwise.
2. Adopting the tailstock rubber roller, press the two rubber rollers tightly, and drive it with a small motor to pull the film.
3. Receiving rubber roller, two up and down, alternately replacing the receiving material.
4. In the intermediate process of making three-side sealed bags, the printing steps are carried out:
There are two upper and lower iron rollers on the front of the printing machine, which put the material up and down. There is a tracking machine in front of the iron roller until the tracking material's left and right swing error is controlled within 1mm of the printing error.
5. Roller blinds are generally made of cool mats or plastics, which mainly play a role of material pressing and tension control. There is an inductance behind the cursor to detect whether there is a film in front to control the operation and stop of the tail roller rubber motor. Stop if there is, move without.
6. Pause board:
Made of stainless steel, it has the function of flattening the film, preventing bag folds, and ensuring the size of the bag, so the suspension plate should be flat. Light objects can be placed on the film to flatten the film.
7. Light eye:
Control the length of the bag, the cutting position, and the length of the color mark by changing the printing color of the three-sided sealing bag with footsteps. The optical eye can be moved forward and backward by adjusting the screws at both ends, and the optical eye is stopped and corrected (2-3mm). White paper can be placed under the film directly facing the optical eye to increase its sensitivity. If the pattern is complicated, you can also put a layer of white paper on the pattern to ensure that the pattern under the light eye is straight, there is no other color before and after, and the pattern interferes.
Optical eye selection:
â‘ Straighter straight line. â‘¡ There is no interference from other patterns in front of the pattern, otherwise it will affect the stop of the optical eye.
8. The most important step in three-side bag sealing: sealing
The sealing knife is triangular, with a set of rollers at each end to ensure that the film runs straight at the sealing knife. Pad rollers are generally heat-resistant silicone rollers. There is a layer of heat-resistant tape on the knife and the silicone roller. There are two copper tiles at both ends of the sealing knife, and the sealing knife is controlled up and down. Therefore, it is necessary to add lubricating oil here.
9. Change the knife cloth:
Grind the sealing knife with sandpaper first; stick the knife cloth in the middle of the knife and rush towards both sides to avoid air bubbles and wrinkles in the middle of the knife cloth, otherwise it will cause a false seal.
10. If there are errors in the first ten steps of making the three-side sealing bag, the adjustment bar can be used:
Adjust the screw to control the height of the iron bar, and then adjust the film cutting position.
11. Corrugated rubber roller:
There is a spring on it to avoid static electricity causing the film to wrap around the roller, and a special motor controls its operation. There are special anti-static devices (one iron and one row of iron needles) before and after the knife is sealed.
12. The final step of three-side sealing is to use a cutter to cut
There are two upper and lower cutters, the lower cutter is fixed, the blade is inclined upward at an angle of about 5 °, and the upper cutter is dropped to cut the film. The cutting knife is mostly cast iron, and lubricating oil is added to both ends of the knife. The front and back distances when contacting with the lower cutter can be controlled by adjusting the upper cutter fixing screw.
13. Folding:
The folding is divided into three steps, and the bag making machine automatically folds. If the customer requires the packaging to face outwards, the reel rotates clockwise when winding. If the words are facing inwards, the reel rotates counterclockwise when winding up.
14. The three-side sealed bag can be packed at this time, and can be packed according to customer requirements, using plastic bags or cartons.
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