1. The premise of making a three-side sealed bag: using a loading frame, an iron cylinder is used to control the up and down of the iron rod, 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 by 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 the three-side sealing bag, the printing step is carried out: two upper and lower iron rollers in front of the printing machine, upper feeding and lower receiving. 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 mat or plastic, which mainly plays 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. Suspension plate: made of stainless steel, which 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 following the changes in the printing color of the three-side sealing bag. The optical eye can be moved forward and backward by adjusting the screws at both ends, and the optical eye is 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. Position selection by light eye: ① Relatively straight line. ② 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 the three-side sealing vacuum packaging bag: 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: first polish the sealing knife with sandpaper; 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 vacuum packaging bag, the adjustment bar can be used: the height of the iron bar is controlled by adjusting the screw, and then the position of the film cutting is adjusted.
11. Corrugated rubber roller: There is a spring on it to prevent static electricity from causing the film to wrap around the roller. A special motor controls its operation. There are special anti-static devices (a iron rod and a row of iron needles) before and after the knife is sealed.
12. The final step of the three-side sealing bag is to use a cutter to cut. There are two upper and lower cutters, the lower cutter is fixed, the blade is inclined upward by about 5 °, and the upper cutter falls 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: Folding is divided into three steps, 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. Three-side sealed vacuum packaging bags can be packed at this time, according to customer requirements, packed in plastic bags or cartons.