Tube Container Laminated Structure Scratch Resistance
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Solution Overview
Problem
Tube containers with glossy and light-shielding properties often suffer from scratches during or after manufacturing, which compromises their aesthetic appearance and durability.
Innovation Solution
A tube container with a laminated structure featuring a high hardness protective layer, an outer polyethylene-based resin layer, and a reinforcing tape with a polyethylene-based resin layer, where the high hardness protective layer has a pencil hardness of 3B or greater, and the outer resin layer has a thickness greater than the protective layer, preventing scratches and enhancing joining strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal vapor-deposited layer and barrier layer are used to achieve glossy properties, light-shielding properties, and gas barrier properties, then the aesthetic appearance and protective properties are improved, but scratches are generated on the surface during or after manufacturing
Solution Approach 1:
The patent applies composite materials by creating a multi-layer laminated structure consisting of a polyethylene-based resin layer, a PET film layer, and a polyolefin resin layer. Each layer serves a specific function: the PET film layer provides high hardness and scratch resistance, while the polyethylene-based resin layers provide flexibility, sealing properties, and adhesion. This composite structure resolves the contradiction by combining materials with complementary properties to achieve both surface durability and protective functions.
Solution Approach 2:
The patent applies local quality by making the PET film layer the outermost layer specifically to provide scratch resistance at the surface, while the inner polyethylene-based resin layers provide different properties such as sealing and adhesion. This localized assignment of functions to different layers allows each layer to optimize its specific role, with the hard PET layer protecting against scratches while the softer inner layers handle sealing and flexibility requirements.
2Object-affected harmful factors
If a high hardness protective layer is added to prevent scratches, then surface durability is improved, but the container structure becomes more complex
Solution Approach 1:
The patent applies universality by designing the laminated structure where each layer performs multiple functions. The PET film layer not only provides scratch resistance but also contributes to light-shielding and structural integrity. The polyethylene-based resin layers provide both sealing properties and adhesion to the PET layer. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in overall structural complexity while achieving scratch resistance.
Solution Approach 2:
The patent applies flexible shells and thin films by using thin PET film and polyethylene resin layers that maintain flexibility despite providing hard protective properties. The thin-film laminated structure offers scratch resistance without creating a rigid, brittle container, thus avoiding excessive complexity while achieving the desired surface durability.
3Manufacturing precision
If the outer polyethylene-based resin layer thickness is increased to enhance joining strength, then manufacturing reliability is improved, but material usage and cost increase
Solution Approach 1:
The patent applies parameter changes by optimizing the thickness of the polyethylene-based resin layer within a specific range (30 μm or more) to achieve sufficient joining strength. Rather than continuously increasing thickness, the patent identifies a threshold value that provides adequate sealing and joining properties at the butted portion, thereby avoiding excessive material usage while maintaining manufacturing reliability.
Solution Approach 2:
The patent applies composite materials by combining the polyethylene-based resin layer with the PET film layer to achieve joining strength through the synergistic properties of the composite structure. The PET layer provides dimensional stability and strength, while the polyethylene layer provides sealing and adhesion, allowing for optimized material distribution that reduces overall material quantity while maintaining joining strength.
Data Source
AI summary
Proposed is a tube container in which generation of scratches on a surface of the container can be prevented. The present tube container (100) includes a tube body (30) that defines a container space (S) for contents and that has a laminated structure. The tube body (30) includes: a cylindrical laminated sheet (31) in which both edges (31a, 31b) of the sheet are butted together; and a reinforcing tape portion (reinforcing tape 35) provided on an inner surface of the laminated sheet (31) along a butted portion (32). The laminate sheet (31) includes a high hardness protective layer (18) constituting an outermost layer, an outer polyethylene-based resin layer (21) formed on an inner side of the high hardness protective layer (18), and an inner polyethylene-based resin layer (11) constituting an innermost layer, and the high hardness protective layer (18) has a pencil hardness of 3B or greater than 3B. The reinforcing tape portion (35) includes a polyethylene-based resin layer (outer reinforcing resin layer 59) as an outermost layer abutting against the inner surface of the laminate sheet (31).