Application of solvent-free in pharmaceutical packaging film
Solvent-free compounding has unique advantages in terms of solvent residues. Drug packaging films have stricter product safety requirements than food packaging, so if solvent-free processes can be used on drug packaging films, they can better achieve the safety of drug packages. Claim.
1. Paper-plastic structure
The paper contains a certain amount of moisture, which will consume the curing agent in the two-component solvent-free compound adhesive and may cause non-drying. In addition, the paper has porosity and strong absorption. The fluidity of the two-component solvent-free glue is much higher than that of the single-component solvent-free glue, which will cause the phenomenon of no glue on the surface and affect the compound strength of the drug packaging film . Therefore, the inner layer film is coated with glue, and the single-component moisture-curing solvent-free compound glue compound is suitable for paper-plastic products.
2. Plastic structure
This type of plastic structure is relatively simple, and solvent-free compounding is fully competent. Drug packaging films mostly use two-component solvent-free compound adhesives, and the flatness of compound products is better.
3. Plastic, aluminum coating
This type of pharmaceutical flexible packaging composite film is mainly based on PET / VMPET / PE, PET / VMCPP, while food flexible packaging composite film is based on BOPP / VMPET / PE (or CPP), BOPP / VMCPP, the difference between the two lies in the surface layer material The gas barrier property of PET is much higher than that of BOPP film. In contrast, the small bubbles that are trapped between the film layers during bonding are more difficult to penetrate through both sides before the glue loses fluidity. Both are materials with good barrier properties. , And white spots appear.
4. Paper, aluminum foil, plastic
Also due to the roughness and absorbency of the paper, it is advisable to use a single-component solvent-free compound adhesive when the paper is aluminum compounded, and it is adjusted to pure aluminum and then glued to the paper to achieve the best effect. Therefore, the adjustment accuracy of the equipment is particularly high), which can reduce the amount of glue. Because the absorption of the coated adhesive layer by the paper is reduced, the phenomenon of lack of adhesive on the surface can be avoided.
5. Plastic (non-single layer), aluminum foil
This type of pharmaceutical packaging film is mainly based on PET / AL / PE, and the appearance quality of the solvent-free compound is not as good as that of the dry-process compound product, and the appearance quality requirements of the compound film are particularly high, and some pharmaceutical packaging plants are second to none. The outer layer is still compounded by dry method, and the inner layer is compounded by solvent-free.
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