High-Temperature Zipper Pouch Bonding with Solventless Adhesive
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Solution Overview
Problem
The process of attaching a zipper construction to a polymeric laminate pouch at high temperatures often causes damage, such as wrinkling and blistering, and solvent-based adhesives used to prevent this damage pose issues like VOC release and increased costs.
Innovation Solution
A solventless adhesive composition is formed by combining a polyisocyanate prepolymer and a polyol component, including a phosphate functional compound, applied to a polyethylene terephthalate layer before contacting a polyethylene layer at high temperatures to attach a zipper construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high temperature is used to attach zipper construction to laminate, then attachment strength is improved, but laminate damage (wrinkling and blistering) occurs
Solution Approach 1:
A release liner is introduced as an intermediary layer between the zipper construction and the laminate during the heat attachment process. The release liner protects the laminate from direct contact with the zipper construction at high temperatures, preventing wrinkles and blisters while still allowing effective heat transfer for strong attachment. The liner is removed after the attachment process is complete.
2Object-affected harmful factors
If solvent-based adhesive composition is used to prevent laminate damage, then laminate damage is reduced, but VOC release and production costs increase
Solution Approach 1:
The adhesive composition is modified by changing its chemical parameters - specifically, using a water-based adhesive instead of a solvent-based adhesive. This substitution maintains the protective function against laminate damage during heat attachment while eliminating volatile organic compounds (VOCs) from the formulation, thereby reducing environmental harm and production costs associated with solvent management.
3Object-affected harmful factors
If solvent-based adhesive composition is used, then laminate damage is prevented, but production costs and processing complexity increase
Solution Approach 1:
The adhesive system is changed from solvent-based to water-based formulation. This parameter change eliminates the need for expensive solvent recovery systems, VOC emission control equipment, and specialized handling procedures, thereby reducing production costs and simplifying manufacturing processes while maintaining protection against laminate damage.
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 effectively prevents damage to the laminate while reducing VOC emissions and production costs, resulting in improved laminate strength and durability.
Implementation Method 1
bringing together a polyisocyanate component and a polyol component to form an adhesive composition
Implementation Method 2
applying a layer of the adhesive composition to a layer of polyethylene terephthalate
Implementation Method 3
contacting a polymeric zipper construction to the first laminate at temperature of 200° C. or higher
Data Source
AI summary
Provided is a process for preparing a zipper pouch, wherein the process comprises: A) forming a first laminate by a process comprising i) bringing together a polyisocyanate component and a polyol component to form an adhesive composition, ii) applying a layer of the adhesive composition to a layer of polyethylene terephthalate, iii) then contacting the layer of the adhesive composition with a layer of polyethylene having thickness of 80 micrometer or more; B) contacting a polymeric zipper construction to the first laminate at temperature of 200 C or higher. Also provided is a zipper pouch made by that process.