Heat sealing paper and packaging bag

By setting a heat-sealing layer containing a specific water-dispersible resin and wetting agent on a paper substrate, the problems of insufficient adhesion resistance and heat-sealing properties of heat-sealable paper are solved, providing an environmentally friendly alternative material suitable for a variety of packaging applications.

CN120882931APending Publication Date: 2025-10-31OJI HLDG CORP
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Patent Information

Application Number
CN202480019696.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2023-03-30
Filing Date
2024-03-21
Publication Date
2025-10-31

AI Technical Summary

Technical Problem

Existing heat-sealable paper is insufficient in terms of adhesion resistance and heat-sealing properties, making it difficult to meet the packaging needs of various applications. Moreover, the environmental impact of plastic packaging is becoming increasingly serious, necessitating the search for alternative materials.

Method used

A heat-sealing layer is formed on a paper substrate, comprising a water-dispersible resin with a glass transition temperature above 0°C and a wetting agent. The content of the wetting agent is controlled between 0.04 and 1.2 parts by weight, and the surface roughness on the uncoated surface is increased to above 12.0 μm. Combined with appropriate pulp selection and processing technology, a heat-sealing paper with excellent anti-blocking properties is formed.

Benefits of technology

It achieves excellent heat-sealing and anti-blocking properties of heat-sealable paper, making it suitable for a variety of packaging applications, while reducing plastic usage and lowering environmental impact.

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Abstract

Provided is a heat sealing paper having excellent heat sealability and blocking resistance. A heat-sealing paper having a heat-sealing layer on one surface of a paper substrate, the heat-sealing layer containing a water-dispersible resin and a wetting agent, the water-dispersible resin containing a water-dispersible resin having a glass transition temperature of 0 DEG C or higher, the wetting agent being contained in an amount of 0.04-1.2 parts by mass per 100 parts by mass of the water-dispersible resin, the surface roughness (RzJIS) of the surface of the heat-sealing paper opposite to the surface having the heat-sealing layer is 12 [mu] m or more.
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Citation Information

Patent Citations

  • Heat seal paper

    JP2022175023A