Bubble?
The causes are too complicated to say. Like the aluminum coating composite white spot, should not be included in the bubble phenomenon. First of all, the bubble separator will appear after entering the curing chamber. Generally off the machine there are mostly with the coating state is not good, this and viscosity, concentration, roller matching problem. Generally, this kind of bubble is small and dense, and experienced masters can see that some bubbles will disappear after aging, and those bubbles will not disappear. However, after entering the curing chamber, the phenomenon of anti sticking appears, which is mostly related to the low purity of solvent. This part of the bubble is generally out of the machine is not visible, after aging will become irregular size, there are mung bean to soybean size.
Curling angle?
Sometimes a part of the bag made is not smooth. Some bags are flat on one side and uneven on the other. If this corner is flat, that corner is not flat. In addition to the tension control, which is the cause of film deformation, and the high heat sealing temperature, there is another reason that the film coil is heated unevenly during aging, and the uneven heating is not the uneven inside and outside of the film coil, but refers to the uneven heating at both ends of the coil. Careful observation will also find that when making bags, the adjacent side is generally tireless or much better, while the other side which is far away from the other side is more serious. If this is the reason, the manufacturer's experience is to leave the film at room temperature for a longer period of time after coming out of the curing chamber, so that the temperature of the film coil can be recovered evenly. Of course, it is better to let the film coil heated in the curing chamber as evenly as possible, so pay attention to the location and mode of the film coil in the curing chamber.
Smooth agent?
The peeling strength is low due to the precipitation of the smoothing agent, which generally appears in the PE film with thickness above 8C. The phenomenon is that there is no obvious change in the initial stage after the composite, and the strength will decline in about 7 days. After tearing, you will find that there is a layer of fog like frost on the intima, which can be scratched by hand. Tear a piece into a high-temperature oven after a few minutes to take out the peel strength will increase a lot, but after minutes the peel strength will drop again. If it is a good composite coil, it can also be put into the curing chamber, placed at a temperature above 60 ℃ for more than 12 hours, which may be able to make up for it. There is no other good way.
Sticky?
That is, the curing is not complete. Most of them are related to the low purity of solvent and high humidity. There is also a barrel of glue divided into two deployment, so that the amount of curing agent added is not accurate. Generally, the greater the amount of one-time compounding, the more stable the quality of composite products. In addition to the problems in bag making, there is also a more hidden problem, which is more terrible. It is that the finished bags are placed in the factory or at the customer's place. Once the contents are loaded (generally more than 5 days), the surface of the bags will wrinkle, and the bags will not dry after being pulled out. Therefore, once you find that there is incomplete solidification, it is easy not to put it to the customer to hold a fluke heart. At least in their own factory with the same content as the customer after the test observation, no problem before delivery.
Poor opening after bag making?
In addition to the poor opening of the bag due to the inner membrane itself and aging, there is also a situation that easily occurs on the thin inner membrane (generally about 3C). Due to the effect of the composite adhesive, the additives of the film migrate to the composite layer as a whole, resulting in the increase of friction coefficient and poor opening.
Dongguan Beite packaging materials Co., Ltd. - located in Dongguan City, the world's manufacturing city, is a subsidiary of Beite packaging (China) Co., Ltd., with a plant area of 6000 square meters. It is a flexible packaging enterprise integrating R & D, production and sales. It has a complete set of domestic advanced production equipment, a scientific and humanized management system and a group of experienced technical personnel For backing, to provide customers with quality products and first-class service.
The company produces composite bags, roll film, fruit bags, aluminum foil bags, suction mouth bags, self-supporting bags, zipper bags, anti-static bags, special-shaped bags, etc., which are suitable for the internal and external packaging of food, daily chemicals, electronics, toys, medicine, cosmetics, industrial products and other industries.
We uphold the integrity of cooperation, good quality, good service business philosophy, won the industry's approval, products sold to all over the world; welcome friends from all walks of life to inquire, visit our factory to investigate guidance and business negotiations.