Recyclable polyethylene single-material high-barrier film bag and processing technology thereof

Abstract

The invention relates to the technical field of plastic flexible packaging, in particular to a recyclable polyethylene single-material high-barrier film bag and a processing technology thereof, the high-barrier bag is easy to process, low in rejection rate, low in non-polyethylene content and good in barrier property and fragrance retention, and equipment used in the processing technology of the high-barrier bag is simple and low in cost. The high-barrier film bag is low in film manufacturing cost, easy to process and high in yield, the high-barrier film bag comprises a printing layer PE film and a heat-sealing layer PE film, the surface of the heat-sealing layer PE film is coated with improved PVA coating liquid, the PVA coating liquid is located on the surfaces of the heat-sealing layer PE film and the printing layer PE film, the printing layer PE film and the heat-sealing layer PE film are compounded through dry compound glue and then cut to manufacture the bag, and the high-barrier film bag is formed. The processing technology of the recyclable polyethylene single-material high-barrier film bag comprises the following steps: S1, preparing a film; s2, PVA (Polyvinyl Alcohol) coating; s3, printing the film cloth; s4, compounding; and S5, bag making.

Description

technical field [0001] The invention relates to the technical field of plastic flexible packaging, in particular to a recyclable polyethylene single-material high-barrier film bag and its processing technology. Background technique [0002] Existing PE single-material film bags mostly use PE / PE material structure, and the two layers of PE are ordinary polyethylene resin, which cannot meet the requirements of high-quality products in terms of moisture resistance, oxygen resistance and fragrance retention. If a multi-layer co-extruded high-barrier PE material structure is used, because the high-barrier materials are mostly EVOH, PA, PVDC and other materials, it needs to reach a certain thickness (≥3μm) to have sufficient barrier properties, and the above materials are compatible with PE materials The performance is not good, and it is necessary to add a connecting resin (≥4μm) during processing, so it is bound to cause a high content of non-polyethylene components in the multi...

AI Technical Summary

Problems solved by technology

[0002] Most of the existing PE single-material film bags use PE / PE material structure, and the two layers of PE are ordinary polyethylene resin, which cannot meet the requirements of high-quality products in terms of moisture resistance, oxygen resistance and fragrance retention

If a multi-layer co-extruded high-barrier PE material structure is used, because the high-barrier materials are mostly EVOH, PA, PVDC and other materials, it needs to reach a certain thickness (≥3μm) to have sufficient barrier properties, and the above materials are compatible with PE materials The property is not good, and it is necessary to add connecting resin (≥4μm) to cooperate during processing, so it is bound to cause a high content of non-polyethylene components in the multi-layer co-extruded PE film

[0003] The above materials have very low compatibility with polyethylene, which reduces the recycling rate and increases the difficulty of secondary processing

[0004] In addition, the cost of the multi-layer co-extrusion equipment that needs to be used is extremely high, the cost of film making for packaging is high, the production and processing are difficult, and at the same time, the waste rate increases, resulting in great waste, which cannot meet the requirements of recycling packaging