Shrink Sleeve Label Bonding via Controlled Solvent Layer
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Solution Overview
Problem
Conventional methods for producing shrink sleeve labels face challenges such as precise control requirements, high risk of partial bonding or damage, increased costs due to specialized films, and the use of potentially harmful solvents, which can lead to uneven and unreliable adhesion and bonding issues.
Innovation Solution
A method involving a device that winds heat-shrink film around formation spindles with a controlled layer of solvent between longitudinal ends, followed by precise solvent dispensing and optional welding, to achieve strong and even bonding while minimizing solvent risks and operational complexities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If laser beam bonding is used to join the overlapping longitudinal edges of the label, then bonding speed and precision are improved, but the risk of partial bonding or damage increases and specialized films are required
Solution Approach 1:
The patent introduces an intermediary substance (adhesive or solvent) between the overlapping edges to facilitate bonding. This mediator allows for more reliable and controllable bonding compared to direct laser beam application, reducing the risk of damage while maintaining bonding effectiveness.
Solution Approach 2:
The patent changes the bonding parameters from high-energy laser beam to controlled application of adhesive or solvent with specific properties. This parameter change allows for adjustable bonding conditions that reduce the risk of damage while ensuring reliable bonding across different film types.
2Manufacturing precision
If specialized films are used for laser beam bonding, then bonding precision is improved, but material costs increase
Solution Approach 1:
The patent employs adhesive or solvent bonding methods that can be applied to a wide variety of film types and materials. This universal approach eliminates the need for specialized films required by laser bonding, thereby reducing material costs while maintaining adequate bonding precision for shrink sleeve labels.
3Quantity of substance
If conventional bonding methods are used, then material costs are reduced, but adhesion evenness and reliability deteriorate
Solution Approach 1:
The patent incorporates control mechanisms that monitor and adjust the application of adhesive or solvent during the bonding process. This feedback control ensures even distribution and optimal bonding conditions, improving adhesion evenness and reliability while maintaining cost-effectiveness compared to specialized laser films.
4Strength
If solvents are used for bonding, then bonding effectiveness is improved, but harmful effects and environmental risks increase
Solution Approach 1:
The patent changes the chemical parameters of the bonding agent by selecting solvents with lower toxicity and environmental impact. This parameter change allows for maintaining bonding strength while reducing harmful effects, aligning with environmental safety requirements.
Solution Approach 2:
The patent converts potentially harmful solvent applications into beneficial bonding by using controlled, minimal amounts of environmentally safer solvents. The solvent serves its bonding function while its reduced harmful properties turn a potential hazard into a safe and effective process.
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 method ensures even and enduring adhesion of shrink sleeve labels to containers, withstands heat-shrinking tensions, and facilitates easy removal, with improved label quality and reduced material costs by using environmentally safer solvents and optimizing bonding processes.
Implementation Method 1
The solvent, in fact, melts part of the material at the interface thus causing the diffusion and formation of 'entanglements' between the chains in the surfaces to be joined.
Implementation Method 2
The solvent, in fact, melts part of the material at the interface thus causing the diffusion and formation of 'entanglements' between the chains in the surfaces to be joined.
Implementation Method 3
The bonding of the longitudinal edges of the film can be done using a layer of solvent.
Implementation Method 4
When the solvent evaporates, diffusing toward the core of the material, the 'entanglements' remain frozen where they formed.
Implementation Method 5
the label is subjected to a heat treatment that is such as to cause its shrinking by way of heat and, therefore, the close adhesion to the lateral surface of the respective container
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A method of producing shrink sleeve labels (2) which comprises: - A step of unwinding a feed reel (3) of heat-shrink film; - A step of separating at least one band of heat-shrink film (5) from the feed reel (3); - A step of feeding the band of heat-shrink film (5) to a formation spindle (4); - A step of winding the band of heat-shrink film (5) around the formation spindle (4) in order to provide a sleeve label (2), there being provided an overlap region (8) between a first longitudinal end (5a) of the band of heat-shrink film (5) in contact with the formation spindle (4) and the second longitudinal end (5b) of the band of heat-shrink film (5), - A step of transferring the sleeve label (2) that is formed around the formation spindle (4) from the formation spindle (4) to a container to be labeled (10); the method comprising a step of interposing a layer of solvent, at the overlap region, between at least one portion of the first longitudinal end and at least one portion of the second longitudinal end, the layer of solvent (6) having a thickness comprised between 0.002 mm and 0.09 mm.