Alternating Heat-Activated Adhesive Tape for Laminating Substrates
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Solution Overview
Problem
Laminating machines face challenges in achieving proper adhesion of reinforcing or tear tapes due to a narrow temperature operating envelope, leading to defects in laminated products as machines operate at increased speeds.
Innovation Solution
An adhesive tape with alternating heat-activated adhesive materials, activated at different temperatures, is used in a laminating process, where the tape is heated and then cooled to ensure proper adhesion to the substrate, expanding the temperature operating envelope and preventing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If laminating machines operate at increased speeds, then productivity is improved, but the temperature operating envelope of tapes becomes too small leading to improper adhesion or setting
Solution Approach 1:
The patent applies parameter changes by using multiple adhesive materials with different activation temperatures (e.g., first adhesive activated at 80-100°C, second adhesive at 100-120°C). This allows the laminating process to maintain reliable adhesion across a broader temperature range while operating at higher speeds, as at least one adhesive remains effective within the compressed temperature envelope.
Solution Approach 2:
The patent uses composite adhesive materials consisting of multiple adhesive layers with different thermal characteristics. The first adhesive layer provides initial bonding at lower temperatures, while the second adhesive layer activates at higher temperatures to ensure complete setting. This composite structure resolves the contradiction by maintaining adhesion reliability across varying temperature conditions at high speeds.
2Strength
If adhesive is heated enough to provide required adhesion, then bond strength is improved, but adhesive may not set properly at machine exit leading to defects
Solution Approach 1:
The patent changes the temperature parameter profile by using adhesives with staggered activation temperatures. The first adhesive activates at a lower temperature range (80-100°C) providing initial bond strength, while the second adhesive activates at a higher temperature range (100-120°C) to ensure complete setting. This multi-stage temperature approach allows the adhesive to achieve both strong bonding and proper setting without defects.
Solution Approach 2:
The first adhesive layer performs preliminary bonding action at lower temperatures, establishing initial adhesion before the second adhesive layer activates at higher temperatures to complete the setting process. This preliminary action ensures that the substrate is already bonded while the second adhesive finishes the setting, preventing defects even at high machine speeds.
3Reliability
If tape is cooled enough at exit to set adhesive, then adhesion setting is improved, but bond strength may be insufficient leading to defects
Solution Approach 1:
The patent uses adhesives with different activation temperatures to decouple the setting process from the bonding process. The first adhesive sets at lower temperatures providing initial reliability, while the second adhesive continues to develop bond strength at higher temperatures. This allows the tape to be cooled sufficiently for setting while the second adhesive maintains and enhances bond strength.
Solution Approach 2:
The first adhesive performs preliminary setting action at lower temperatures, establishing reliable adhesion before cooling. The second adhesive then continues to develop full bond strength as the temperature increases or during the cooling process. This preliminary setting ensures reliability while the second adhesive ensures adequate bond 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 allows for increased operating speed of laminating machines by ensuring consistent adhesion across a wider temperature range, reducing defects in laminated products and maintaining structural integrity.
Implementation Method 1
the adhesive layer consists of at least two different heat-activated adhesive materials located in an alternative sequence over at least one surface of the core structure, the heat-activated adhesive materials being activated at different temperatures
Implementation Method 2
cooling the packaging laminate for setting said first heat activated adhesive to provide a first adhesion between the adhesive tape and the packaging substrate
Data Source
AI summary
The present invention discloses a method and process to laminate packaging substrates using an adhesive tape. The tape has a first heat activated adhesive which is activatable at a first temperature and a second heat activated adhesive which is activatable at a second temperature and both of which are alternatively coated on at least one surface of the tape. The method consists of laminating this aforementioned tape to a packaging substrate by following the process of: placing this tape in or on a laminating machine over the packaging substrate, heating the tape at least to the second temperature while making contact with the packaging substrate, cooling the packaging laminate until the second heat activated adhesive is set and cutting a predetermined portion of the packaging laminate before a second adhesive occurs between the tape and the packaging laminate.