Adhesive Resin Pellets Underwater Antiblocking
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Solution Overview
Problem
Adhesive resin pellets with high adhesiveness used for adhesive tapes experience blocking issues, leading to contamination during adhesive sheet formation and adherend contamination, and existing methods fail to completely prevent these problems.
Innovation Solution
The underwater pelletizing method involves adding polyolefin fine particles as an antiblocking agent to the water, where the adhesive resin is extruded and cut to form pellets, ensuring uniform attachment and reducing non-covered areas, followed by dehydration and drying to enhance the antiblocking effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic powder lubricant or metal soap is used as antiblocking agent, then blocking of adhesive resin pellets is prevented, but contamination of T-die and reduction in productivity occur
Solution Approach 1:
The patent uses a water-soluble antiblocking agent that can be easily removed during washing, replacing persistent inorganic lubricants that cause contamination. This allows for quick cleaning of equipment without long-term contamination, maintaining productivity while preventing blocking.
Solution Approach 2:
The patent changes the chemical nature of the antiblocking agent from inorganic/metal-based to water-soluble organic compounds, fundamentally altering how the agent interacts with equipment and water during the pelletizing process, thereby eliminating contamination issues.
2Reliability
If inorganic substance is used as lubricant, then blocking is reduced, but moisture absorption increases causing foaming during film formation
Solution Approach 1:
The patent changes the chemical composition from inorganic substances to water-soluble organic compounds with controlled hydrophilicity, adjusting the parameter of moisture interaction to prevent both blocking and excessive moisture absorption that causes foaming.
Solution Approach 2:
The water-soluble antiblocking agent is designed to be temporarily present during pelletizing for blocking prevention, then completely removed during washing, eliminating residual substances that could cause foaming during subsequent film formation.
3Reliability
If polyolefin powder is attached to thermoplastic elastomer pellets, then blocking is prevented, but non-covered areas remain causing blocking in highly adhesive resins
Solution Approach 1:
The patent changes from using large polyolefin powder to water-soluble organic compounds that form uniform molecular-level coverage, fundamentally altering the scale and uniformity of the antiblocking layer to eliminate non-covered areas while maintaining blocking prevention.
Solution Approach 2:
The water-soluble antiblocking agent acts as an intermediary substance that uniformly distributes across the pellet surface at molecular levels, providing complete coverage without the aggregation and non-uniform distribution problems of polyolefin powder.
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
This method effectively prevents blocking of adhesive resin pellets with high adhesiveness and reduces contamination during adhesive sheet preparation and adherend interaction, maintaining optimal adhesive properties.
Implementation Method 1
polyolefin fine particles are attached to surfaces of adhesive resin pellets
Implementation Method 2
dehydration and drying of pellets is insufficient, foaming occurs due to an influence of moisture
Data Source
AI summary
A method for manufacturing adhesive resin pellets includes adding an antiblocking agent to water, melting an adhesive resin and extruding the adhesive resin into the water, and cutting the adhesive resin extruded into the water to form adhesive resin pellets. Polyolefin fine particles used for the antiblocking agent have an average particle diameter of 1 μm or more and less than 18 μm, and the adhesive resin has an adhesive force of less than 15.00 N/25 mm.