Peel Detection Label with Segmented Adhesive Layer
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Solution Overview
Problem
Existing tamper prevention labels either break when peeled, leaving adhesive residue or fail to detect peeling at low speeds, and lack pattern expressibility.
Innovation Solution
A peel detection label comprising a laminate with a backing, pattern layer, and pressure-sensitive adhesive laminate, featuring an intermediate layer and adhesive layer, with specific tensile modulus and surface modifications to prevent adhesive residue and enable clear detection of peeling at low speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polystyrene film with thickness of 10 μm or greater and 40 μm or less is used as a tampering prevention label, then the label exhibits tampering prevention function by breaking when peeled, but adhesive residue contaminates the adherend
Solution Approach 1:
The label is divided into multiple functional layers: a polystyrene film layer (10-40 μm) that breaks to provide tampering detection, and a separate adhesive layer that remains intact on the adherend. This segmentation allows the breaking function and adhesive function to be independent, preventing adhesive residue contamination while maintaining tampering prevention capability.
Solution Approach 2:
The adhesive is extracted from the substrate layer and placed in a separate adhesive layer. When the polystyrene film breaks during peeling, only the film breaks while the adhesive layer remains on the adherend without contaminating it. This extraction separates the harmful breaking effect from the adhesive function.
2Object-generated harmful factors
If a label is designed to peel without leaving adhesive residue, then adhesive contamination is prevented, but pattern expressibility is not sufficient when peeled at low speeds
Solution Approach 1:
The label structure provides different properties in different layers: the polystyrene film layer (10-40 μm) is designed to break at specific locations to create clear pattern expression during low-speed peeling, while the adhesive layer maintains optimal adhesion properties. This local quality differentiation enables both clean peeling and excellent pattern expressibility.
Solution Approach 2:
The label uses a composite structure combining polystyrene film (10-40 μm thickness) with a separate adhesive layer. This composite material approach allows the polystyrene to provide pattern expression through controlled breaking at low peeling speeds, while the adhesive layer ensures clean separation without residue, achieving both requirements simultaneously.
3Reliability
If the label is peeled at low speed for tampering detection, then clear detection is possible, but pattern expressibility deteriorates
Solution Approach 1:
The polystyrene film thickness is optimized to 10-40 μm, which is thin enough to break and express patterns during low-speed peeling (improving pattern expressibility) but thick enough to maintain structural integrity for reliable tampering detection. This parameter optimization resolves the contradiction between detection reliability and pattern expressibility at low speeds.
Data Source
AI summary
The present invention relates to a peel detection label that is a laminate having a backing, a pattern layer formed on a part of a surface of the backing, and a pressure sensitive adhesive laminate in this order, the pressure sensitive adhesive laminate having at least an intermediate layer and a pressure sensitive adhesive layer, wherein a tensile modulus Et at 23° C. of the backing is 50 MPa or greater and 1000 MPa or less.