Hardside Luggage Shell Composite Layering for Wear Resistance
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Solution Overview
Problem
Traditional hardside luggage cases lack wear and abrasion resistance, leading to scratching and damage during handling and use.
Innovation Solution
A hardside luggage design featuring a softer outer material layer bonded to a substrate layer via a carrier film, providing increased scratch and wear resistance by forming protrusions that absorb impact and reduce contact with the substrate layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional hard materials are used for hardside luggage construction, then structural strength and rigidity are provided, but wear and abrasion resistance deteriorates
Solution Approach 1:
The patent applies composite materials by bonding a softer outer material layer to a harder substrate layer. The substrate layer (e.g., polycarbonate, ABS) provides structural strength and rigidity, while the outer material layer (e.g., thermoplastic polyurethane, thermoset polyurethane) provides enhanced wear and abrasion resistance. This composite structure resolves the contradiction by combining materials with complementary properties.
Solution Approach 2:
The patent applies local quality by providing different material properties at different locations/layers of the luggage shell. The outer material layer has softer, more abrasion-resistant properties specifically at the surface that contacts handling equipment, while the substrate layer maintains hardness and structural integrity throughout. This localized differentiation of material properties allows the luggage to resist scratching while maintaining overall strength.
2Reliability
If a softer outer material layer is bonded to the substrate layer, then scratch and wear resistance is improved, but device complexity increases
Solution Approach 1:
The patent merges the outer material layer and substrate layer into a single integrated shell structure through bonding. The layers are combined using adhesives, co-molding, or other bonding techniques that create a unified construction. This merging approach reduces complexity compared to using separate, loosely attached components, while still providing the benefits of differentiated material properties for scratch resistance.
3Reliability
If the outer material layer protrudes away from the exterior surface, then abrasion resistance is enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-forming the outer material layer with protruding features (such as ribs, bumps, or textured patterns) before bonding it to the substrate layer. The protrusions are created during the molding or forming of the outer layer, allowing the abrasion-resistant geometry to be established in advance. This preliminary formation simplifies the overall manufacturing process compared to adding protrusions after bonding.
Solution Approach 2:
The patent applies parameter changes by varying the thickness of the outer material layer to create protruding regions. The outer layer is molded with non-uniform thickness, where certain areas have greater thickness to form protective protrusions that extend beyond the substrate layer surface. This parameter variation in layer thickness provides enhanced abrasion resistance at critical contact points while maintaining manufacturability through standard molding techniques.
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 design significantly enhances the luggage's resistance to abrasion and damage, protecting the substrate layer while maintaining a lightweight construction.
Implementation Method 1
The outer material layer provides an impact-absorbing sacrificial layer that resists abrasion as well as reducing contact between the outer surface of the substrate layer
Implementation Method 2
The outer material layer may be bonded, adhered, or molded to the substrate layer by a carrier film positioned between the substrate layer and the outer material
Data Source
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AI summary
A hardside luggage article (100) may include a first shell component (180) formed at least in part by a lamina (184). The lamina may include a substrate layer (200), a carrier film (188), and a material layer (250) affixed to the substrate layer via the carrier film. The substrate layer may define a surface (204) and a first material property. The carrier film may have opposing first and second surfaces (206, 208). The first surface of the carrier film may be affixed to the surface of the substrate layer. The material layer may be affixed to the second surface of the carrier film. The material layer may define a second material property. The second material property may be different than the first material property. The material layer may form at least one feature (252) protruding away from the surface of the substrate layer.