Label Sheet Porous Coating Air Pocket Prevention
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Solution Overview
Problem
Existing label sheets face challenges in providing long-term resistance to light, UV radiation, ozone, dirt, water, chemicals, and mechanical impact, especially for large-format labels, and often result in air pockets during lamination, making them unsuitable for outdoor use and difficult to reposition.
Innovation Solution
A label sheet comprising a transparent film support, a pressure-sensitive adhesive layer, a release layer, and a printable layer with detachment lines, where the pressure-sensitive adhesive layer is applied in a pattern or with a roughness of 4 to 50 μm to create non-adhesive regions, allowing for accurate lamination and repositioning while preventing air pockets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transparent laminating film is used to improve resistance to water, UV radiation, and chemicals, then the label's durability is improved, but air pockets form during lamination making the label unsuitable for large-format applications
Solution Approach 1:
The printable layer is provided with a porous coating on its upper side, where the pores have a diameter of 1 to 50 μm and a porosity of 10 to 80%. This porous structure allows air to escape during the lamination process, preventing air pocket formation between the label and the transparent film, while still maintaining the label's durability and resistance properties.
2Manufacturing precision
If the printable layer is made rough to reduce air pockets, then lamination quality is improved, but printing quality may be affected
Solution Approach 1:
The porous coating provides surface roughness through its pore structure (pore diameter 1 to 50 μm, porosity 10 to 80%) which facilitates air escape during lamination, improving lamination quality without significantly affecting printing quality as the pores are sufficiently small to not interfere with inkjet or laser printing processes.
Solution Approach 2:
The porous coating's parameters (pore diameter 1 to 50 μm, porosity 10 to 80%) are optimized to balance two functions: providing enough roughness to prevent air pocket formation during lamination, while maintaining a surface that is still suitable for high-quality printing with commercial inkjet or laser printers.
3Reliability
If pigmented inks are used to enhance light resistance, then durability is improved, but compatibility with inkjet desktop printers is lost
Solution Approach 1:
The transparent laminating film acts as an intermediary protective layer that provides UV radiation resistance and durability, allowing the use of standard inkjet or laser printable materials without requiring specialized pigmented inks. The film's UV-absorbing properties protect the printed indicia from fading while maintaining compatibility with commercial printing systems.
Solution Approach 2:
The UV protection and durability functions are extracted from the ink system and transferred to a separate transparent laminating film component. This allows the printable layer to use simple, compatible inkjet or laser inks while the film provides the protective barriers against UV radiation, water, and chemicals.
4Reliability
If special-purpose UV-absorbing films are used to improve weathering resistance, then durability is improved, but compatibility with commercial printers is lost
Solution Approach 1:
The transparent laminating film serves as an intermediary protective layer that provides UV absorption and weathering resistance, while the underlying printable layer remains compatible with commercial inkjet or laser printers. The film's UV-absorbing components protect the printed material without interfering with the printing process.
Solution Approach 2:
The label structure uses a composite of a standard printable material (paper, cardboard, or plastic film) and a transparent laminating film with UV-absorbing properties. This composite structure combines the printability of commercial materials with the weathering resistance of specialized UV-protective films.
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 solution enables the production of labels that are resistant to environmental factors, suitable for long-term indoor and outdoor use, and allows for easy repositioning and reduction of air pockets, particularly beneficial for large-format labels.
Implementation Method 1
The porous coating (40) has a pore diameter of 1 to 50 μm and a porosity of 10 to 80%
Implementation Method 2
a pressure-sensitive adhesive layer (12), a release layer (14)
Data Source
AI summary
A label sheet includes a transparent film support material, a pressure-sensitive adhesive layer, a release layer, a printable layer, one or more first detachment lines, and one or more second detachment lines. The transparent film support material has an inner surface and an outer surface. The pressure-sensitive adhesive layer is disposed over the transparent film support material inner surface. The release layer is disposed over the pressure-sensitive adhesive layer. The printable layer is disposed over the pressure-sensitive adhesive layer, and includes an inner surface facing the release layer and an opposing outer surface. The outer surface exhibits a roughness of 4 to 50 μm (DIN 4768). The one or more first detachment lines extend from the printable layer outer surface and through the printable layer and the release layer, to thereby form a first sub-region. The one or more second detachment lines extend from the support material outer surface and through the support material and the pressure-sensitive adhesive layer, to thereby form a second sub-region that is larger than the first sub-region.