Key points of production control in the production of mask packaging bags
High-end facial masks have become a trend. In addition to showing excellent performance and texture in aluminum foil packaging bags, there is also a shelf life. Most masks have a shelf life of more than 12 months, and some even have a shelf life of 36 months. With such a long shelf life, the most basic requirements for packaging bags are: tightness and high barrier properties.
In view of the consumption characteristics of the facial mask itself and the requirements of its own shelf life, the material structure and requirements of the facial mask packaging bag are basically determined.
At present, the main structure of most masks is: PET/AL/PE, PET/AL/PET/PE, PET/VMPET/PE, BOPP/VMPET/PE, BOPP/AL/PE, MAT-OPP/VMPET/PE, MAT-OPP /AL/PE etc.
From the perspective of the main material structure, aluminized film and aluminum foil film are basically used in the packaging structure.
Compared with aluminum plating, aluminum foil has a good metallic texture, silvery white, and anti-gloss properties; aluminum metal is soft, and products with different composite materials and thicknesses can be customized according to requirements, which meets the pursuit of high-end products for thick texture, allowing high-end masks from It is more intuitively reflected on the packaging.
Because of this, mask packaging bags have changed from the basic functional requirements to the high-end requirements of performance and texture, which has led to the transformation of mask bags from aluminum-coated bags to aluminum foil bags.
It is self-evident how important the mask packaging bag is to the mask. Compared with the fancy decoration on the surface, the storage and protection functions of the mask packaging bag are actually more important. But in fact, many people ignore this point.
From the analysis of the raw materials themselves, the general mask packaging bags are mainly divided into two types: aluminized bags and aluminum foil bags. The aluminized bag is a high-purity metal aluminum evenly coated on the plastic film under high temperature and vacuum state. The aluminum foil bag is an extension of a pure metal aluminum sheet, which is compounded with a plastic film, which can improve the barrier properties, sealing properties, fragrance retention properties, and shielding properties of plastics. In other words, aluminum foil mask bags are more suitable for the current market requirements of mask packaging bags.
Key Points of Control in the Composite Link of Mask Packaging Bags
Compounding mainly controls three aspects: compounding wrinkling, compounding solvent residue, compounding pitting and air bubbles and other abnormalities. In this process, these three aspects are the key factors affecting the yield of mask packaging bags.
1. Composite wrinkling
It can be seen from the above structure that the mask packaging bag mainly involves the lamination of aluminum foil. Aluminum foil is rolled from pure metal into a very thin film-like sheet, commonly known as "aluminum film" in the industry, and the thickness used is basically between 6.5 and 7 μm. Of course, there are also thicker aluminum films.
The pure aluminum film is very prone to wrinkles or breaks, or abnormalities such as tunnels during the lamination process. Especially for the compound machine with automatic splicing, when splicing, due to the irregularity of the automatic bonding of the paper core, it is easy to be uneven, and it is very easy for the aluminum film to wrinkle directly after lamination, or even dead wrinkles.
For the wrinkled material, on the one hand, we can remedy it from the follow-up to reduce the loss caused by the wrinkled material. When the composite glue is stable to a certain state, it is a way to reroll it, but this is only a way to reduce it; on the other hand, it can be solved from the root cause. Reduce, such as using a larger paper core, so that the winding effect is more ideal.
2. Composite solvent residue
Since the packaging of the mask basically contains aluminum plating or pure aluminum, for the composite, the presence of aluminum plating or pure aluminum is not good for the volatilization of solvents, because the barrier properties of the two are stronger than other general materials, so Unfavorable for solvent volatilization. Although it is clearly stated in the GB/T10004-2008 "Plastic Composite Film and Bag Dry Composite Extrusion Lamination for Packaging" standard: this standard does not apply to plastic films and bags made of plastic materials and paper base or aluminum foil.
However, at present, mask packaging companies and most companies also follow this national standard. For aluminum foil bags, this standard is also required, so it is somewhat misleading.
Of course, there is no clear requirement in the national standard, but we still need to control solvent residues in actual production, after all, this is a very critical control point.
As far as personal experience is concerned, it is feasible to effectively improve the selection of glue, the speed of production, the temperature of the oven, and the exhaust air volume of the equipment. Of course, this aspect needs to be analyzed and improved for specific equipment and specific environments.
3. Composite pitting and air bubbles
This problem is also mainly related to pure aluminum, especially when the structure of composite PET/AL is more likely to appear. There will be a lot of "crystal point"-like phenomenon accumulated on the composite surface, or similar "bubble" point-like phenomenon. There are several main reasons for this:
Base material: The surface treatment of the base material is not good, and it is easy to produce pitting and air bubbles; the base material PE has too many crystal points and is too large, which is also a main cause of problems. On the other hand, the particle aspect of the ink is also one of the factors. In addition, the leveling of the glue and the coarse particles of the ink will also cause similar problems when combined.
Furthermore, in terms of machine operation, when the solvent is not volatilized enough and the lamination pressure is not high enough, similar phenomena will also occur, either because of the clogging of the gluing mesh roller or foreign objects.
