Brittle Adhesive Sheet Structure for Tamper Labels and Matrix Waste Removal
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Solution Overview
Problem
Existing adhesive sheets using polystyrene-based resin film base materials are prone to tearing during matrix waste removal, leading to inefficiencies in producing tamper-proof labels.
Innovation Solution
A brittle adhesive sheet comprising a polystyrene-based resin film base material with a print receptive layer made of polyester- or acrylic-based resin, designed to enhance printability and prevent unauthorized unsealing while minimizing matrix waste breaking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polystyrene-based resin film base material is used for the adhesive sheet, then the tamper-proof effect is achieved through easy tearing, but the matrix waste breaks during removal reducing production efficiency
Solution Approach 1:
The film base material is divided into two distinct layers: a polystyrene-based resin layer that provides brittleness and tamper-proof effect, and a polyester-based resin layer that provides strength and prevents matrix waste breaking. This segmentation allows each layer to perform its specific function independently, resolving the contradiction between tamper-proof effect and production efficiency.
Solution Approach 2:
The invention uses a composite film base material consisting of a polystyrene-based resin layer and a polyester-based resin layer. The polystyrene layer provides the desired brittleness for tamper-proof labeling, while the polyester layer provides tensile strength to prevent breaking during matrix waste removal, thereby maintaining production efficiency.
2Strength
If a polystyrene-based resin film base material is used, then the adhesive sheet is easily torn for tamper-proof effect, but the matrix waste is easily broken during removal
Solution Approach 1:
The film base material is segmented into a polystyrene-based resin layer that provides controlled tearing for tamper-proof effect, and a polyester-based resin layer that provides resistance to breaking during matrix waste removal. This segmentation allows the material to exhibit different mechanical properties in different contexts.
Solution Approach 2:
Different regions of the film base material have different quality characteristics: the polystyrene-based resin layer is designed to be brittle and easy to tear at the label separation interface, while the polyester-based resin layer is designed to be strong and resistant to breaking in the matrix waste regions.
3Reliability
If the film base material is made brittle for tamper-proof effect, then unauthorized unsealing is prevented, but printability is compromised
Solution Approach 1:
The film base material is constructed as a composite of polystyrene-based resin and polyester-based resin. The polystyrene component provides brittleness for unauthorized unsealing prevention, while the polyester component provides good printability, thus resolving the contradiction between security function and manufacturing function.
Data Source
AI summary
A brittle adhesive sheet includes a film base material, and an adhesive layer provided at a first surface side of the film base material, wherein the film base material has a film base material main body formed of a polystyrene-based resin and a print receptive layer provided at a second surface side, opposite to a side of the film base material where the adhesive layer is provided, and the print receptive layer includes a polyester-based resin or an acrylic-based resin.