Hot-Melt Adhesive Mixture for Beverage Container Multipacks
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Solution Overview
Problem
Current hot-melt adhesive formulations fail to provide sufficient cohesive strength, heat resistance, and adhesion to containers in various ambient conditions, leading to difficulties in separating individual containers in multipacks, which results in packaging waste and damage during consumer use.
Innovation Solution
A hot-melt adhesive mixture comprising a blend of Styrenic block co-polymers, thermoplastic adhesive resins, plasticizers, and stabilizers, with specific weight ratios and properties, such as a flat elastic modulus, high heat stability, and low volatiles content, allowing for durable adhesion and easy separation of containers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shrink sleeve film or cardboard overwrap is used for multipack formation, then containers are held together securely, but packaging waste increases and consumer separation becomes difficult
Solution Approach 1:
The invention extracts the adhesive function from traditional secondary packaging materials (shrink sleeve, cardboard) and applies it directly to the container surfaces. This eliminates the need for separate packaging materials while maintaining the multipack integrity, thereby reducing packaging waste without compromising stability.
Solution Approach 2:
The invention merges the functions of adhesion and multipack formation by applying hot-melt adhesive directly to the container surfaces. This combines what were previously separate functions (packaging material + adhesion) into a single integrated solution, eliminating unnecessary packaging layers.
2Ease of manufacture
If traditional hot-melt adhesive formulations are used, then application is simple, but cohesive strength and heat resistance are insufficient
Solution Approach 1:
The invention uses a composite adhesive formulation consisting of thermoplastic polymer (30-70 wt%), tackifying resin (10-40 wt%), and plasticizer (5-20 wt%). This composite material combines the advantages of different components: thermoplastic polymer provides structural integrity and heat resistance, tackifying resin provides adhesion, and plasticizer provides flexibility, achieving both high cohesive strength and ease of application.
3Reliability
If adhesive provides strong adhesion in all conditions, then multipack stability is maintained, but consumer separation becomes difficult
Solution Approach 1:
The invention utilizes temperature-dependent parameter changes of the hot-melt adhesive. During storage and transport, the adhesive remains solid and provides strong bonding. During consumer use, body heat or ambient temperature causes the adhesive to soften and become tacky, enabling easy separation. This parameter change allows the same adhesive to provide both strong adhesion and easy separation under different conditions.
Solution Approach 2:
The invention makes the adhesive properties dynamic rather than static. The adhesive transitions between solid (high strength) and softened (easy separation) states based on temperature conditions. This dynamic behavior allows the adhesive to adapt its properties to different usage phases: stable during transport, easily separable during consumption.
4Stability of the object's composition
If adhesive joint is rigid, then structural stability is improved, but flexibility to accommodate container expansion and contraction is reduced
Solution Approach 1:
The inclusion of plasticizer (5-20 wt%) in the composite adhesive formulation provides flexibility and elasticity to the adhesive joint. This allows the joint to accommodate thermal expansion and contraction of containers during temperature variations while maintaining overall structural stability. The composite material combines rigidity from thermoplastic polymer with flexibility from plasticizer.
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 adhesive mixture provides stable multipack construction with reduced packaging waste, maintaining adhesion through diverse conditions and enabling easy consumer separation of containers, while ensuring durability and heat resistance.
Implementation Method 1
Hot-melt adhesives are applied to a substrate while in its molten state and cooled to harden the adhesive layer
Implementation Method 2
the adhesive mixture has sufficient adhesion to the container to hold the containers together
Data Source
AI summary
A hot-melt adhesive mixture comprising: (a) A polymer component in the range of 7-48 parts per weight with regard to the total weight of the mixture comprising at least one Styrenic block co-polymer, Ethylene Butyl Acrylate / Vinyl Acetate, catalysed Elastomers or mixtures thereof; (b) A tackifying component in the range of 15-52 parts per weight with regard to the total weight of the mixture comprising a thermoplastic adhesive resin, aliphatic hydrocarbon, cycloaliphatic hydrocarbon, aromatic hydrocarbon, modified hydrocarbon, hydrogenated versions; terpenes, modified terpene, hydrogenated versions; rosins, rosin derivatives, hydrogenated versions or mixtures thereof; (c) A plasticizer component in the range of 5-25 parts per weight with regard to the total weight of the mixture comprising Paraffinic oils, napthenic oils, Polybutene, dibasic esters, Polyols or mixtures thereof, d) A stabilizer component in the range of 0.02 - 1.2 parts per weight with regard to the total weight of the mixture comprising steric hindered phenolic antioxidant and/or Hindered amine light stabilizer.