Hot Melt Adhesive Pellets Non-Tacky Coating
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Solution Overview
Problem
Existing hot melt adhesives in granulated form face issues with non-blocking coatings during storage and transportation, leading to adhesion and clogging problems, which hinder automated feeding and processing, and result in thermal stress and property degradation due to excessive shell material.
Innovation Solution
Development of hot melt pressure sensitive adhesive pellets with a core of polymers like polyesters, polyacrylates, and polyurethanes, coated with a non-tacky thermoplastic polymer film, allowing for bulk supply and automatic feeding, and maintaining non-blocking properties during storage and transportation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hot melt adhesives are provided in granulated form with coating for non-sticking, then transportation and storage stability is improved, but the coating blocks during storage and causes adhesion problems
Solution Approach 1:
The patent changes the chemical composition parameters of the coating material by incorporating specific additives (wax, oil, or grease) that modify the surface properties. This parameter change allows the coating to maintain non-sticking properties during storage by preventing the adhesive core from bonding to itself, thereby resolving the blocking issue while preserving storage stability.
Solution Approach 2:
The patent creates a composite coating structure combining multiple materials (polymer base + wax/oil/grease additives) to achieve both non-sticking properties and storage stability. This composite approach allows the coating to function as a barrier that prevents adhesion between pellets during storage and transportation, resolving the contradiction between reliability and harmful blocking effects.
2Productivity
If larger portions of adhesive are packaged for bulk supply, then automated feeding efficiency is improved, but thermal stress and property degradation increase
Solution Approach 1:
The patent segments the adhesive into small granulated pellets (1-5mm diameter) that can be bulk-packaged and automatically fed. This segmentation allows efficient bulk handling while reducing the total volume subjected to thermal stress during storage and processing, as smaller portions can be more uniformly heated and processed, thereby resolving the contradiction between productivity and thermal degradation.
Solution Approach 2:
The patent applies a thin film coating to the granulated adhesive pellets that provides thermal protection during processing. This thin film barrier reduces direct thermal exposure to the adhesive core, minimizing thermal stress and property degradation while allowing the pellets to be supplied in bulk for automated feeding operations.
3Object-generated harmful factors
If powder coating is applied to adhesive surface, then non-sticking properties are improved, but coating stability against friction and handling deteriorates
Solution Approach 1:
The patent changes the physical state parameter of the coating material from loose powder to a bound film structure incorporated into the pellet matrix. This parameter change transforms the coating from a friable surface layer to a stable integral part of the pellet, providing both non-sticking properties and resistance to friction during handling and transportation.
Solution Approach 2:
The patent merges the coating material with the adhesive core during the granulation process, creating an integrated structure where the non-sticking coating is embedded within the pellet matrix rather than applied as a separate surface layer. This combining approach ensures the coating remains stable against friction and handling while maintaining its non-sticking function.
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 enables free-flowing pellets with improved storage stability and reduced thermal stress, allowing for automated processing and reduced adhesive degradation, enabling efficient supply and application of small portions without manual feeding.
Implementation Method 1
the film forming material comprising thermoplastic polymers having a melting point of less than 120° C.
Data Source
AI summary
The invention relates to hot melt adhesives which are pressure sensitive adhesives whereby the adhesive is provided in a granulated form and is free-flowing and does not block during storage. Such pellets can be used as feed for automated feeder devices for the supply hot melt application systems.