Bag machine operation FAQ
Bag making processing is the last process of plastic flexible packaging production and processing. If the bag quality is unqualified or consumed too much, then it is equal to the previous several processes before the work is done, but it will seriously affect the production and operation of the company to the customers’ claims. .
The following are the “Bag Machine Operation FAQs†compiled by Xiao Bian.
1. What should I do if the heat sealing of the bag making machine does not completely result in leakage or deterioration of the contents?
Cause: The anti-fouling heat sealability of the film is poor, mainly because the resin used in the inner seal layer is not suitable.
Countermeasures: Use anti-pollution heat-sealing film. In general, LDPE has a moderate anti-pollution heat sealability, EVA has a good anti-pollution heat sealability when the VA content is large, LDPE also has a good anti-pollution heat sealability, ionic resin and metallocene polymer are Has excellent anti-pollution heat sealability.
2, bag making machine sealing crisp and brittle broken how to do?
Reasons: (1) excessive heat sealing temperature; (2) excessive pressure; (3) excessive heat sealing time; (4) edge of the upper sealing device is too sharp or the coated Teflon is damaged; (5) ) Silicon rubber at the bottom is too hard; (6) During compounding and curing, a portion of the adhesive penetrates into the interior of the film. As the substrate is affected by the penetration of the adhesive, the toughness (impact resistance) is reduced and the brittleness is improved; (7) After the plastic packaging bag is cooled and placed, the heat sealing strength is increased, and there is a trend of becoming brittle. .
Countermeasures: (1) According to the heat sealing properties of the material of the inner seal layer, select the appropriate processing temperature, pressure and heat sealing time; (2) improve the surface condition of the upper heat seal knife, and make the surface of the sealer flat; (3) to gather Tetrafluoroethylene cloth is well-wrapped; (4) Choose a silicone rubber pad with suitable hardness.
3, how to do when the bag is warped after heat sealing?
Reasons: (1) The thickness of the composite film is inconsistent; (2) The heat sealing temperature is too high or the heat sealing time is too long; (3) In the longitudinal heat sealing knife part, the running path of the composite film is not straight; (4) Cooling is not Full; (5) insufficient curing time; (6) poor heat resistance of the surface layer substrate film; (7) improper control of the tension matching of the composite substrate in the composite process, resulting in residual stress after maturation and setting, especially Thinner composite films are more prone to such failures.
Countermeasures: (1) adjust the tension of the floating roller; (2) choose an inner sealing substrate with low-temperature heat-sealability; (3) adjust the heat-seal temperature to a suitable temperature; (4) fully cool; (5) fully mature (6) Reselect the surface layer film; (7) Adjust the tension of each part of the composite processing equipment to make the recombination rates of the two composite substrates equal as far as possible.
4. What should I do if the outline of the heat seal surface is not clear? (The knife pattern is not clear)
Reasons: (1) short cooling time; (2) poor cooling plate contact; (3) melting of the edge due to heating of the silicone pad; (4) uneven horizontal heat sealing force; (5) edge of the heat sealing blade is not Neat and blunt.
Countermeasures: (1) adjust the cooling time; (2) adjust the cooling plate; (3) replace or adjust the heat sealing knife; (4) prevent the edge of the silicone pad caused by overheating melting;
5, how to do bad heat seal strength.
Causes: (1) The adhesive in the composite film has not been hardened sufficiently; (2) The heat seal condition is not appropriate; (3) The distance between the heat seal knife and the cooling knife is too long; (4) There is a problem with the inner seal film. ;
(5) The heat-resistant sealability of the ink is poor, resulting in a decrease in the composite strength of the heat-seal film; (6) Dust, dusting and other substances adhere to the thermal cover; (7) The composite strength is low or the composite strength at the heat-sealing site is decreased. many.
Countermeasures:
(1) Hardening of the binder (curing, curing) by heat aging improves the composite film's composite strength and heat resistance.
(2) Select the best heat sealing conditions (temperature, time, and pressure), or improve the heat sealing method according to the composition of the composite film, the heat sealing state, etc., and cool immediately after heat sealing.
(3) Check the shelf life and storage conditions of the heat seal layer film. If the heat seal layer uses an old batch film and a heat seal film, pay special attention.
(4) Increase the thickness of the heat seal layer film.
(5) Change the type and grade of the heat seal layer film, and use an inner seal layer film with anti-contamination heat sealability.
(6) Check whether the grade of the adhesive meets the requirements (the exudation of low-molecular materials in the resin sometimes affects the composition of the adhesive).
(7) To improve the heat sealing performance of the heat seal layer (base material) and to control the content of the lubricant, the mLLDPE film was used.
(8) Control the monomer content of MDI in the adhesive binder.
(9) Check the extent of the thermal cover.
(10) Replace the ink (preferably two-liquid ink).
(11) Change the printing pattern of the packaging bag so that the ink-printed portion avoids the heat-sealing portion or changes the heat-sealing method. (Special attention should not be printed on the metal ink seal).
6, how to do when the heat sealed part produces air bubbles or uneven surface?
Reasons: (1) When heat-sealing on a moisture-absorbing material structure such as a nylon film, the hygroscopic film absorbs moisture to generate bubbles; (2) The heat-sealing knife or the heat-sealed silicone mat is uneven; (3) The heat-sealing pressure is insufficient (4) The use of one-component adhesives, such as neoprene adhesives, tends to produce bumps and bumps on hot covers during heat sealing.
Countermeasures: (1) Keep the raw materials and semi-finished products properly and avoid moisture absorption; (2) Check or adjust the heat sealing knife and heat-sealing silicone pad; (3) Replace the adhesive.
7, how to do bad slippery?
Reasons: (1) The maturation temperature is too high and the slip agent loses its effect at high temperatures; (2) The adhesive penetrates into the inner surface and affects the friction coefficient of the surface of the substrate film, especially when the film is thin and electrically. Such problems are more likely to occur when the halo treatment is excessive; (3) the film substrate itself is poor in smoothness.
Countermeasures: (1) Strictly control the ripening conditions (according to the product ripening operation instructions); (2) Check the type or grade of the adhesive; (3) Replace the substrate or use dusting.
8, composite film knot, how to do it?
Cause: The quality of the film and adhesive.
Countermeasure: Dust when making bags.
9. How to deal with deviations in bag width and lax seams? (Chinese seal, side seal)
Reasons: (1) uneven thickness of the composite film; (2) abnormal size of the specification plate; (3) improper tightness of the film wrapping specification plate.
The tighter the package, the greater the resistance, but also affect the forming width of the bag. It's loose and it's prone to tight seams.
Countermeasures: (1) Adjust the specification plate; (2) Adjust or replace the composite film; (3) Adjust the tightness of the film wrapping specification plate. For thinner films, there will be a lateral shrink hold pattern when tensioned, so the size of the form should be smaller than the standard size. For thicker films, the plate size should also be smaller than the standard size due to the thickness.
10. What should I do if I can't get up and down?
Reasons: (1) The thickness of the composite film is not uniform and there is a lotus leaf edge; (2) The tension of the double floating roller is too small; (3) Some rollers do not rotate smoothly.
Countermeasures: (1) Adjust the tension of the double-floating rollers; (2) Check and adjust the guide rollers (such as compensating rollers, adjusting rollers, etc.).
Bag making processing is the last process of plastic flexible packaging production and processing. If the bag quality is unqualified or consumed too much, then it is equal to the previous several processes before the work is done, but it will seriously affect the production and operation of the company to the customers’ claims. .
The following are the “Bag Machine Operation FAQs†compiled by Xiao Bian.
1. What should I do if the heat sealing of the bag making machine does not completely result in leakage or deterioration of the contents?
Cause: The anti-fouling heat sealability of the film is poor, mainly because the resin used in the inner seal layer is not suitable.
Countermeasures: Use anti-pollution heat-sealing film. In general, LDPE has a moderate anti-pollution heat sealability, EVA has a good anti-pollution heat sealability when the VA content is large, LDPE also has a good anti-pollution heat sealability, ionic resin and metallocene polymer are Has excellent anti-pollution heat sealability.
2, bag making machine sealing crisp and brittle broken how to do?
Reasons: (1) excessive heat sealing temperature; (2) excessive pressure; (3) excessive heat sealing time; (4) edge of the upper sealing device is too sharp or the coated Teflon is damaged; (5) ) Silicon rubber at the bottom is too hard; (6) During compounding and curing, a portion of the adhesive penetrates into the interior of the film. As the substrate is affected by the penetration of the adhesive, the toughness (impact resistance) is reduced and the brittleness is improved; (7) After the plastic packaging bag is cooled and placed, the heat sealing strength is increased, and there is a trend of becoming brittle. .
Countermeasures: (1) According to the heat sealing properties of the material of the inner seal layer, select the appropriate processing temperature, pressure and heat sealing time; (2) improve the surface condition of the upper heat seal knife, and make the surface of the sealer flat; (3) to gather Tetrafluoroethylene cloth is well-wrapped; (4) Choose a silicone rubber pad with suitable hardness.
3, how to do when the bag is warped after heat sealing?
Reasons: (1) The thickness of the composite film is inconsistent; (2) The heat sealing temperature is too high or the heat sealing time is too long; (3) In the longitudinal heat sealing knife part, the running path of the composite film is not straight; (4) Cooling is not Full; (5) insufficient curing time; (6) poor heat resistance of the surface layer substrate film; (7) improper control of the tension matching of the composite substrate in the composite process, resulting in residual stress after maturation and setting, especially Thinner composite films are more prone to such failures.
Countermeasures: (1) adjust the tension of the floating roller; (2) choose an inner sealing substrate with low-temperature heat-sealability; (3) adjust the heat-seal temperature to a suitable temperature; (4) fully cool; (5) fully mature (6) Reselect the surface layer film; (7) Adjust the tension of each part of the composite processing equipment to make the recombination rates of the two composite substrates equal as far as possible.
4. What should I do if the outline of the heat seal surface is not clear? (The knife pattern is not clear)
Reasons: (1) short cooling time; (2) poor cooling plate contact; (3) melting of the edge due to heating of the silicone pad; (4) uneven horizontal heat sealing force; (5) edge of the heat sealing blade is not Neat and blunt.
Countermeasures: (1) adjust the cooling time; (2) adjust the cooling plate; (3) replace or adjust the heat sealing knife; (4) prevent the edge of the silicone pad caused by overheating melting;
5, how to do bad heat seal strength.
Causes: (1) The adhesive in the composite film has not been hardened sufficiently; (2) The heat seal condition is not appropriate; (3) The distance between the heat seal knife and the cooling knife is too long; (4) There is a problem with the inner seal film. ;
(5) The heat-resistant sealability of the ink is poor, resulting in a decrease in the composite strength of the heat-seal film; (6) Dust, dusting and other substances adhere to the thermal cover; (7) The composite strength is low or the composite strength at the heat-sealing site is decreased. many.
Countermeasures:
(1) Hardening of the binder (curing, curing) by heat aging improves the composite film's composite strength and heat resistance.
(2) Select the best heat sealing conditions (temperature, time, and pressure), or improve the heat sealing method according to the composition of the composite film, the heat sealing state, etc., and cool immediately after heat sealing.
(3) Check the shelf life and storage conditions of the heat seal layer film. If the heat seal layer uses an old batch film and a heat seal film, pay special attention.
(4) Increase the thickness of the heat seal layer film.
(5) Change the type and grade of the heat seal layer film, and use an inner seal layer film with anti-contamination heat sealability.
(6) Check whether the grade of the adhesive meets the requirements (the exudation of low-molecular materials in the resin sometimes affects the composition of the adhesive).
(7) To improve the heat sealing performance of the heat seal layer (base material) and to control the content of the lubricant, the mLLDPE film was used.
(8) Control the monomer content of MDI in the adhesive binder.
(9) Check the extent of the thermal cover.
(10) Replace the ink (preferably two-liquid ink).
(11) Change the printing pattern of the packaging bag so that the ink-printed portion avoids the heat-sealing portion or changes the heat-sealing method. (Special attention should not be printed on the metal ink seal).
6, how to do when the heat sealed part produces air bubbles or uneven surface?
Reasons: (1) When heat-sealing on a moisture-absorbing material structure such as a nylon film, the hygroscopic film absorbs moisture to generate bubbles; (2) The heat-sealing knife or the heat-sealed silicone mat is uneven; (3) The heat-sealing pressure is insufficient (4) The use of one-component adhesives, such as neoprene adhesives, tends to produce bumps and bumps on hot covers during heat sealing.
Countermeasures: (1) Keep the raw materials and semi-finished products properly and avoid moisture absorption; (2) Check or adjust the heat sealing knife and heat-sealing silicone pad; (3) Replace the adhesive.
7, how to do bad slippery?
Reasons: (1) The maturation temperature is too high and the slip agent loses its effect at high temperatures; (2) The adhesive penetrates into the inner surface and affects the friction coefficient of the surface of the substrate film, especially when the film is thin and electrically. Such problems are more likely to occur when the halo treatment is excessive; (3) the film substrate itself is poor in smoothness.
Countermeasures: (1) Strictly control the ripening conditions (according to the product ripening operation instructions); (2) Check the type or grade of the adhesive; (3) Replace the substrate or use dusting.
8, composite film knot, how to do it?
Cause: The quality of the film and adhesive.
Countermeasure: Dust when making bags.
9. How to deal with deviations in bag width and lax seams? (Chinese seal, side seal)
Reasons: (1) uneven thickness of the composite film; (2) abnormal size of the specification plate; (3) improper tightness of the film wrapping specification plate.
The tighter the package, the greater the resistance, but also affect the forming width of the bag. It's loose and it's prone to tight seams.
Countermeasures: (1) Adjust the specification plate; (2) Adjust or replace the composite film; (3) Adjust the tightness of the film wrapping specification plate. For thinner films, there will be a lateral shrink hold pattern when tensioned, so the size of the form should be smaller than the standard size. For thicker films, the plate size should also be smaller than the standard size due to the thickness.
10. What should I do if I can't get up and down?
Reasons: (1) The thickness of the composite film is not uniform and there is a lotus leaf edge; (2) The tension of the double floating roller is too small; (3) Some rollers do not rotate smoothly.
Countermeasures: (1) Adjust the tension of the double-floating rollers; (2) Check and adjust the guide rollers (such as compensating rollers, adjusting rollers, etc.).
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