Polyamide/polypropylene composite medical packaging film

Abstract

The invention relates to a polyamide / polypropylene composite medical packaging film. The packaging film adopts polyamide as the outer layer to keep heat resistance and puncture resistance, reduce moisture absorption rate, guarantee barrier property and fit for high-temperature high-moisture environments; a heat seal layer adopts metallocene polyethylene (mLLDPE) and ethylene-methyl acrylate (EMA) blend modified resin to guarantee good heat sealing between the film and a non-adhesive breathable paper; the polyamide crystallization speed and polyethylene crystallization speed have larger difference, and in the production technology, the heat seal layer (polyethylene) is put at the utmost outer layer, the polypropylene layer is put in the inner layer, so that the coiling of the film surface is solved and the flat heat sealing with the non-adhesive breathable paper is guaranteed; the film is coextruded and blown by using a bottom blowing water cooling method to guarantee that the transparency of the film surface is not less than that of the dry composite film; and meanwhile, the dew point height, the blow-up ratio and the traction ratio are strictly controlled during production so that optimal formability of the film in the longitudinal and transverse directions is guaranteed. Compared with the prior art, the packaging film has good comprehensive performance and high market competition strength, and is material-saving and competitive in markets.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a polyamide / polypropylene medical packaging film. Background technique [0002] Medical equipment packaging film has great market potential, and medical equipment has high requirements for packaging film. It not only needs to ensure the film's flexibility, formability, and good heat-sealing strength with uncoated paper, but also consider its barrier Hygienic properties such as bacteria, puncture resistance and content stability in a sterile environment, heat resistance and no migration of harmful substances, and environmental friendliness. [0003] Based on this, people are actively researching various new materials for medical equipment packaging to meet the multi-faceted and multi-level performance requirements of surgical medical equipment. The currently recognized and better packaging method is: first use a blister packaging film that meets medical standards to mel...

AI Technical Summary

Problems solved by technology

The dry lamination process is characterized by simple operation and flexible interlayer collocation, but its biggest defect is that the surface tension of the adhesive layer is relatively high. Although the adhesive solvent is dried with a large power, it is inevitable that there will be solvent residues. , and waste of energy, dry waste gas and volatilization of organic solvents will also pollute the environment

There is no solvent residue in the compounding process of solvent-free compounding, and there is no exhaust gas emission to pollute the environment. However, due to various factors such as unstable control of the ratio of the main agent and curing agent, and complex compounding process conditions, it has not been widely used.

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