Propylene Block Copolymer Release Liner for Label Laminates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing label laminates face challenges in handling and application due to the lack of a suitable release liner that provides adequate protection and easy dispensing, while maintaining mechanical stability and low elongation in the machine direction.
Innovation Solution
A label laminate comprising a face stock, a release liner with a substrate made of propylene block copolymer oriented in the machine direction, and an adhesive layer, where the release liner has a low elongation of less than 3% at a tension level between 200 and 1200 N/m, and a specific ratio of secant modulus in the machine direction to elongation in the transverse direction between 2 and 15, is manufactured using a melt processing technique and subsequent stretching and coating processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a release liner is used to protect the adhesive layer and enable easy handling, then the label can be easily handled and protected up to dispensing, but the release liner may elongate during handling causing misplacement during labeling
Solution Approach 1:
The patent changes the material parameters of the release liner by using oriented propylene block copolymer with specific mechanical properties (elongation <3% at 200-1200 N/m tension, specific secant modulus to elongation ratio between 2-15). This resolves the contradiction by selecting material parameters that simultaneously provide easy handling and dimensional stability.
Solution Approach 2:
The patent uses a composite structure consisting of oriented propylene block copolymer substrate combined with adhesive layer and face stock. The oriented propylene block copolymer provides the necessary mechanical stability while maintaining ease of handling, resolving the contradiction between handling ease and dimensional stability.
2Adaptability or versatility
If the release liner has high elongation to allow flexibility during handling, then the label can be easily manipulated, but the label may be misplaced during the labeling process
Solution Approach 1:
The patent optimizes the mechanical parameters of the release liner by controlling elongation to be less than 3% at specified tension levels and adjusting the secant modulus to elongation ratio to be between 2-15. This resolves the contradiction by finding the optimal parameter range that provides sufficient flexibility for handling while maintaining precision for label placement.
3Ease of manufacture
If conventional substrates are used for the release liner, then the manufacturing process is simple, but the mechanical stability and low elongation in the machine direction cannot be achieved
Solution Approach 1:
The patent changes the substrate material from conventional options to oriented propylene block copolymer with specific mechanical properties. This resolves the contradiction by selecting a material that can be manufactured using standard processes while achieving the required mechanical stability and low elongation characteristics.
Solution Approach 2:
The patent employs a composite material system where oriented propylene block copolymer is combined with adhesive and face stock layers. This composite structure achieves superior mechanical stability while remaining compatible with conventional manufacturing processes, resolving the contradiction between manufacturing simplicity and mechanical strength.
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 provides a label laminate with improved mechanical stability, reduced elongation in the machine direction, and enhanced flexibility in the transverse direction, ensuring efficient handling and application without misplacement during labeling processes, while allowing for easy recycling of the release liner.
Implementation Method 1
stretching the substrate in a machine direction of the substrate so as to provide a machine direction oriented substrate
Implementation Method 2
coating one surface of the machine direction oriented substrate with a release agent layer
Data Source
AI summary
The invention relates to a label laminate and a release liner of the label laminate. According to an embodiment release liner comprises a substrate comprising propylene block copolymer. The substrate may be oriented in a machine direction of the substrate. The substrate may have an elongation of the substrate in a machine direction of the substrate is less than 3% at a tension level between 200 and 1200 N/m. The substrate may have a ratio of 1% secant modulus in machine direction of the substrate to elongation in transverse direction of the substrate is between 2 and 15. Further the invention relates to a use of a release liner for self-adhesive label laminate and to a method for providing a label laminate.