Translucent Polyurethane Heat-Seal Labels for Low-Temperature Bonding
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Solution Overview
Problem
Existing heat seal labels require high temperatures and pressures for bonding, which can damage products and are not aesthetically pleasing due to opacity, and lack efficient low-temperature alternatives that blend seamlessly with the product.
Innovation Solution
A translucent polyurethane web with a transparent polyurethane thermoplastic adhesive film that bonds at low temperatures and pressures, allowing for fast activation and integration with the product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high temperature and pressure are used to activate adhesives for heat seal labels, then adequate bonding is achieved, but product damage occurs and energy consumption increases
Solution Approach 1:
The patent changes the temperature parameter for adhesive activation from conventional high temperatures (>170°C) to low temperatures (below 170°C, preferably 80-150°C). This parameter change enables adequate bonding without causing product damage, directly resolving the contradiction between bonding quality and product safety
Solution Approach 2:
The patent employs a disposable low-temperature adhesive layer that is applied to the label backing. This adhesive is designed to activate at low temperatures and is discarded after single use, eliminating the need for expensive high-temperature equipment and preventing product damage while achieving reliable bonding
2Reliability
If high temperature and pressure are used to activate adhesives, then adequate bonding is achieved, but production time and energy input increase
Solution Approach 1:
The patent changes the temperature and pressure parameters for adhesive activation. By using low temperatures (80-150°C) and moderate pressure, the bonding process is accelerated, reducing production time while maintaining bonding quality, thus resolving the contradiction between reliability and production efficiency
Solution Approach 2:
The adhesive is pre-applied to the label backing in a controlled manner during label manufacturing, ensuring optimal placement and amount. This preliminary action eliminates the need for complex application equipment and reduces production time during label attachment, while maintaining adequate bonding quality
3Strength
If opaque materials are used for labels, then durability is achieved, but aesthetic quality deteriorates
Solution Approach 1:
The patent uses a composite structure consisting of a polypropylene or polyester backing material (providing durability) combined with a transparent or translucent adhesive layer and optional transparent overcoat. This composite material achieves both label durability and aesthetic quality by allowing the product surface to show through the label
Solution Approach 2:
The patent employs transparent or translucent materials for the label and adhesive layers, effectively changing the optical properties from opaque to transparent. This allows the label to be durable while simultaneously maintaining the aesthetic quality of the product by allowing light transmission and visibility of the product surface
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
Enables efficient, low-energy bonding of labels to various materials with minimal environmental impact, enhancing product aesthetics by blending seamlessly with the substrate.
Implementation Method 1
the adhesive is then preferably activated using relatively low heat and pressure to bond the polyurethane web to the product
Data Source
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Figure 3A~3B
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AI summary
A label material attachable to a product, and a method of applying the label material to the product is described herein. Printed indicia, such as brand identifiers or other labeling information, are applied to the substantially transparent label material using a thermal or other suitable printer. The label material is then bonded to the product using a low heat and pressure technique to activate the adhesive. Once applied to the product, a portion of the label material bonded to the product substantially blends into the product leaving only the printed indicia readily visible to a consumer. The label material comprising: a polyurethane web comprised of a top side and a back side; an adhesive applied to the back side; and a removable backing. In a preferred embodiment the adhesive is a polyurethane thermo-adhesive.