Three-layers Laminating Pouches Composite packaging materials
Composite film composite if the use of water-based glue how to achieve the best composite effect, how good after the compound of the aging process so that the peel strength is better, the following will be one by one description!
1, can be diluted with water?
At present, the water-based glue on the market is mostly emulsion type. The principle is that the macromolecule-dependent emulsifier is stable in water. It is actually a metastable state. Many external forces will cause the glue to break the emulsion and lose effect.
Therefore, it is not recommended to dilute the glue with water. Because dilution with water increases the surface tension of the glue, destroying the stability of the glue, resulting in delamination. In addition, dilution will change the surface properties of the product, resulting in poor wetting, affecting the composite appearance.
2, with water-based adhesive film, the need for aging?
Water-based plastic composite film generally do not need to ripen, the machine can be cut. Appropriate ripening for a period of time, can improve the peel strength, because the high molecular weight of water-based glue, need a certain time to achieve a better level of leveling.
Therefore, when the conditions of the composite membrane at 50 ℃ cooked room curing 1h ~ 4h better. The higher temperature (above 80 ℃) aging has a certain effect on the strength of the composite film, because the water-based polymer can not withstand long-term high temperature.
Composite packaging of the heat sealing layer due to the different use of different areas and functional, the use of materials is different, each heat sealing materials which have different characteristics, the following will be your one by one analysis.
First, polyethylene film
Polyethylene for composite heat sealing, mainly low-density polyethylene and linear low-density polyethylene (also some products used in the density and high density polyethylene film to do heat sealing layer), and generally more use of two polyethylene A certain proportion of blending after use. According to the different processing methods, can be divided into blown film, cast film and extrusion coating film. The thickness of the composite polyethylene film, depending on the requirements of the package, choose a different thickness, thin can be about 20μ, thick can be greater than 100μ. Since there are many additives in the resin for the production of films, especially slip agents, attention should be paid to the migration of additives in production.
Metallocene polyethylene can be said to be a revolution in polyethylene resin, making the film made of metallocene polyethylene, a good thermal adhesive strength, heat sealing strength, there is a certain anti-sealing pollution performance. At present, metallocene polyethylene and low density polyethylene blends production of the film, has been in the oil bag, shampoo bag, laundry powder package and other aspects of extensive use. At present, most of the composite packaging of the heat seal layer made of polyethylene, such as instant noodles, biscuits, mustard, pickles and so on. Blowing plastic film and cast film in the middle of the process to be subject to EDM, the film surface tension greater than 38 dyne / cm.
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