Flexible packaging film capable of being composited by microwaves, automatic exhaust packaging film for microwave ovens, and packaging bag

Abstract

The invention relates to the technical field of flexible packaging, and particularly relates to a packaging film which can be applied to the heating of food in microwave ovens, and a packaging bag prepared from the packaging film. A flexible packaging film capable of being composited by microwaves is composited by multiple layers of films, the innermost layer is a polyethylene film or a casting polypropylene film, and the other layers of films are any one or more of a biaxially oriented polyester film, a biaxially oriented polypropylene film and a biaxially oriented polyamide film; and the polyethylene film is composed of low-density polyethylene, linear low-density polyethylene, metallocene polyethylene and inorganic filler, the casting polypropylene film is composed of homo-polypropylene, co-polypropylene and inorganic filler, and the inorganic filler is at least one of titanium dioxide, calcium carbonate and silica with a particle size of 30-700 nanometers. According to the invention, as the film at the innermost layer contains a certain amount of inorganic filler, a certain number of micropores can be drilled by using laser, and in the process of microwave heating, the gaps between micropores are widened, so that an effect of automatic exhaust is achieved.

Description

technical field [0001] The invention relates to the technical field of flexible packaging, in particular to a packaging film that can be used in microwave ovens and a packaging bag made of the packaging film. Background technique [0002] In recent years, microwave heating of food has been widely popularized due to its advantages of convenience and hygiene. When the food is wrapped in a packaging film or put into a packaging bag and heated in a microwave oven, the food will generate a lot of hot steam and accumulate in the bag. Therefore, it is required that the packaging film or packaging bag will not melt or burst under high temperature. [0003] In order to ensure that the food is properly cooked in the microwave, and to prevent the bag from bursting, many microwaveable bags have vents, or artificially pierce the film or bag with a sharp object to pierce several holes to prevent the bag from bursting. The heat or water vapor generated during microwave cooking can be rele...

AI Technical Summary

Problems solved by technology

[0005] However, for the materials and methods listed in this patent, it is difficult to accurately and stably control the thickness of the remaining material (that is, the thickness of the thinned wall pattern) at 5 to 25 microns during laser irradiation or cutting, and it often occurs that the material is cut off , or the thickness of the remaining material reaches more than 25 microns; and in the subsequent processing of composite flexible packaging roll film cutting, bagging and other processes, the remaining material with a thickness of 5 to 25 microns is often broken, resulting in obvious leakage

Moreover, the laser cutting speed in this patent is 0.36 m / s, and the production speed is relatively slow

Images