Polymeric Label Material with Voided Layer for Water-Based Adhesive Drying
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Solution Overview
Problem
Conventional polymeric labels using water-based adhesives have long drying times, leading to handling issues and potential peeling or falling off, while self-adhesive plastic labels are expensive and slower to apply, and traditional paper labels are prone to damage and moisture-related issues.
Innovation Solution
A polymeric label material with a biaxially-oriented, voided polymeric sheet and an adhesive-receiving coating having a surface energy of at least 40 dyne/cm-1, featuring a highly voided core layer and thin or absent lower skin layer, allowing rapid drying and strong bonding with water-based adhesives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polymeric labels are used with water-based adhesives, then the labels are stronger and more durable than paper labels, but the drying time of the adhesive is very long (several hours or days)
Solution Approach 1:
The label material employs a highly voided polymeric sheet with a porous structure that allows rapid absorption of water-based adhesive. The voids in the polymeric material act as capillaries, enabling the adhesive to be quickly drawn into and absorbed by the label substrate, thereby reducing drying time from hours/days to minutes while maintaining the durability benefits of polymeric labels.
Solution Approach 2:
The invention changes the physical parameters of the polymeric material by controlling the void content and density. By adjusting the degree of voiding and the resulting porosity parameters, the material's ability to absorb and wick away adhesive moisture is optimized, transforming the drying time characteristic without compromising the structural integrity or durability of the polymeric label.
2Reliability
If self-adhesive plastic labels are used, then many problems of paper labels are overcome, but the cost is large due to the need for a release liner
Solution Approach 1:
The invention extracts and eliminates the expensive release liner component from the label system. By using a polymeric material with high surface energy and porous structure that enables direct bonding with water-based adhesives, the design removes the need for the release liner layer, thereby reducing manufacturing cost while preserving the durability and moisture resistance benefits of plastic labels.
Solution Approach 2:
The invention replaces the expensive self-adhesive system with a cheaper water-based adhesive system. The polymeric label material is designed to work with conventional, less expensive water-based adhesives rather than requiring costly self-adhesive formulations, making the overall label solution more economical while maintaining reliability.
3Reliability
If self-adhesive plastic labels are used, then label durability is improved, but the application speed is much slower than paper labels
Solution Approach 1:
The porous, voided structure of the polymeric label material enables rapid wicking and absorption of water-based adhesive, allowing the adhesive to penetrate and bond quickly. This capillary action facilitates fast application speeds comparable to paper labels while maintaining the durability advantages of polymeric materials, as the adhesive is rapidly drawn into the porous structure rather than requiring slow evaporation-based bonding.
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 label material achieves rapid drying and strong adhesion comparable to traditional paper labels, reducing costs and improving durability, making it practical and economical for use on non-absorbent products like glass or plastic containers.
Implementation Method 1
the adhesive-receiving coating includes a polymeric binder and an absorbent pigment
Implementation Method 2
the polymeric sheet having a voided layer... allowing rapid drying
Implementation Method 3
attaching a label to a product body with a water-based adhesive
Data Source
AI summary
A label material for use with water-based adhesives. The label material includes a synthetic paper having an upper surface and a lower surface. The synthetic paper includes a biaxially-oriented polymeric sheet having a voided layer. A printable coating is optionally provided on an upper surface of the polymeric sheet and an adhesive-receiving coating is provided on a lower surface of the polymeric sheet. The polymeric sheet has a density of not more than 0.55 g·cm−3. The adhesive-receiving coating includes a polymeric binder and an absorbent pigment and has a surface energy of at least 40 dyne·cm−1.