Basic knowledge and common faults of zipper bag
The main advantage of the zipper bag is to increase the shelf display effect, the user is easy to use, is a relatively modern packaging form, has a great advantage in improving product grades and video effects, it is a very ideal packaging product.
Zipper bags have a wide range of applications, such as beverage packaging, condiment packaging, tea packaging, dry goods series packaging, casual packaging, etc. will use self-supporting packaging bags this new form of packaging. Not only food, but also some cleaning products, daily cosmetics, medical supplies, etc. are also widely used.
In recent years, self-supporting zipper bags have continued to heat up in the use of snacks and other snack foods, and they want to maintain a "high fever" posture. As early as a century ago, Hershey first proposed the concept of early adopting the kiss of her good times, and its resealable bag is "a modern way to complete the desire to control the serving size." "Re-sealable bags also provide sharing, small portions, and portability. For today's consumers, these are big trends."
The common faults in the production process of zipper bags are as follows:
The bag bends
1. The balance between film tension and chain tension is not good.
2. The temperature of the zipper heat seal is too high.
3. The tension of the rubber roller under the zipper is tight and the tension of the roller is poor.
Poor heat sealing of the zipper tape
1. Foreign matter (residue of polyethylene, dust) is mixed in the zipper heat sealing plate.
2. The Teflon surface installed on the zipper frame is damaged or there is foreign matter.
3. The Teflon surface of the zipper plate is damaged or has foreign objects.
One end of the heat seal of the zipper tape is not heat sealed or the heat seal strength is extremely weak
1. The thickness of the zipper tape is inappropriate.
2. The position of the zipper heat sealing plate and the belt are not aligned.
Welding of the zipper anastomosis
1. The zipper heat sealing temperature is too high.
2. The position of the heat seal of the zipper is offset, and the anastomosis part is pressed.
3. The waiting time is too long and is affected by the preheating.
There is no problem with the tension adjustment roller, but there is a deviation on the side of the zipper frame and the pattern
1. The position of the zipper plate is too low, the lower film is heat sealed with the lower side, and the cooling plate generates friction. Or affected by the preheating of the heat seal on the lower side.
2. The rubber roller on the lower side of the zipper does not clamp the film well, making the film slip.
3. The position of the upper separation roller of the rubber roller on the lower side of the zipper is not set properly.
4. The tension of the tension adjustment roller is too small.
The strength of the zipper is too small
1. The original zipper tape itself has too low anastomotic strength.
2. The thermal cover on the opening side of the zipper tape / inside pocket is reversed.
3. The temperature of the heat seal of the zipper is set too high, and the anastomosis part is deformed, especially the concave part is opened.
4. At the zipper plate, the flow of the film and the angle of the zipper plate deviate, and the edge of the zipper plate rubs against the anastomosis part.
5. The top cooling plate is too wide and presses on the anastomosis.
6. The upper and lower gaps of the lower rubber roller string are too small, and the zipper matching portion is pressed too tightly.
In the spot heat seal, the gas volume pressure is too much
1. The temperature of the longitudinal heat seal is set too high.
2. The longitudinal pressure is too large, the edge of the heat seal is pressed into the rubber table.
3. The rubber table is worn or uneven.
4. The width of the cooling plate (upper) is too large, and the top heat seal is not pressed.
In the horizontal heat seal, the gas volume pressure is too much
1. When heat-sealing the reinforcing block, the heat-sealing plate does not press down the film sufficiently.
2. The silicone rubber (especially the upstream side) of the pressure table has concave or uneven surface.
3. Teflon cloth with coarse grain is used on the heat sealing plate and the silicone rubber of the table to absorb the air into the grain.
In the pressed part of the zipper, leaving the core or leaking liquid
1. The gap of the heat seal of the zipper is too small.
2. The temperature of the spot heat seal of the zipper is set too low.
Drawer Slide Rail,Kitchen Drawer Channel,Kitchen Slim Box Drawer,Soft-Closing Drawer Slides
Foshan city boucheron precision hardware co.,ltd , https://www.chinadrawerbox.com