Self-Adhesive Resealable Package Design
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Solution Overview
Problem
Conventional packaging with hinged lids cannot be resealed after opening, leading to a loss of airtightness and potential deterioration of contents, particularly for sweets packaged in composite films.
Innovation Solution
A package design featuring a self-adhesive made from a cross-linking material comprising a (meth)acrylic acid ester copolymer resin and a crosslinking agent, allowing the package to be repeatedly opened and sealed, maintaining airtightness by using a foam adhesive that adheres to contact portions of the package body and lid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional hinged lid package is opened, then the package can be accessed, but the airtightness is damaged and the package cannot be sealed again
Solution Approach 1:
The self-adhesive is pre-applied to the contact portions of the package body and lid before use. When the package is opened and closed, the adhesive automatically bonds the surfaces together, enabling repeated sealing without additional action from the user. This preliminary preparation allows the package to maintain airtightness after opening.
Solution Approach 2:
The adhesive's gel fraction is controlled to be 70% or less, which optimizes its bonding properties for repeated sealing. This parameter control ensures the adhesive remains effective after multiple open-close cycles while maintaining strong initial adhesion, thus preserving airtightness without compromising ease of operation.
2Strength
If a self-adhesive with high gel fraction is used, then the adhesive strength is improved, but the airtightness deteriorates
Solution Approach 1:
The gel fraction of the self-adhesive is precisely controlled to be 70% or less. This parameter optimization balances adhesive strength and airtightness: the adhesive remains strong enough to bond the package components while maintaining the flexibility and sealing properties needed to preserve airtightness during repeated opening and closing operations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The package can be repeatedly sealed and opened without damaging the self-adhesive, ensuring the airtightness is maintained, thus preserving the contents by preventing air and moisture ingress.
Implementation Method 1
a self-adhesive (E) that consists of a cross-linking material of a resin composition (C) containing a (meth)acrylic acid ester copolymer resin (A), and a crosslinking agent (B)
Implementation Method 2
the self-adhesive (E) may be arranged on at least part of the contact portion
Data Source
AI summary
Provided is a method for producing a self-adhesive to be arranged on a package comprising a space to store contents and an opening by which the space and an outside communicate, wherein the opening is repeatedly openable and sealable by the self-adhesive that consists of a cross-linking material of a resin composition containing a (meth)acrylic acid ester copolymer resin having a glass transition temperature of −22.8° C. or more, and a crosslinking agent. The method comprises making the resin composition that contains the (meth)acrylic acid ester copolymer resin, and the crosslinking agent, the resin composition being either emulsion or dispersion; and cross-linking the resin composition.