Hockey Skate Boot Form with Multi-Material Injection Molding
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Solution Overview
Problem
Hockey skate boot designs constructed from rigid materials restrict movement and limit design options due to lack of flexibility, particularly in the upper regions, and pose challenges in attaching materials.
Innovation Solution
The use of multiple plastic materials with varying hardness properties and fiber reinforcement, formed through injection molding, allows for a boot design with graduated flexibility and attachment options, including thermoformable components for improved fit and customization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid materials are used for skate boot construction, then protection against impacts is improved, but flexibility and movement freedom deteriorate
Solution Approach 1:
The skate boot is constructed with different materials for different regions: rigid materials (thermoplastic polyurethane, polyethylene) are used in areas requiring impact protection (toe, shank, heel), while more flexible materials (nylon, spandex, elastomeric blocks) are used in areas requiring flexibility (upper regions, quarters). This local differentiation resolves the contradiction by providing both protection and flexibility in appropriate locations.
Solution Approach 2:
The boot combines multiple materials with different mechanical properties including thermoplastic polyurethane, polyethylene, nylon, spandex, and elastomeric blocks in a single construction. This composite approach allows the boot to simultaneously achieve impact resistance from rigid materials and flexibility from softer materials, resolving the technical contradiction between protection and movement freedom.
2Strength
If rigid materials are used for skate boot construction, then protection is improved, but design options and attachment capability deteriorate
Solution Approach 1:
Different material regions are selected based on functional requirements: rigid materials provide protection where needed, while flexible materials like nylon and spandex in the upper regions provide surfaces suitable for stitching and attaching quarters, laces, and other components. This resolves the contradiction by enabling attachment capability in flexible regions while maintaining protection in rigid regions.
3Ease of manufacture
If uniform material construction is used, then manufacturing simplicity is improved, but performance optimization and customization deteriorate
Solution Approach 1:
The boot employs different materials in different regions optimized for specific functions: rigid materials for protection, flexible materials for comfort and attachment, with varying densities and properties throughout. This regional differentiation enables performance optimization for each area while remaining manufacturable through established multi-material molding and assembly processes.
Solution Approach 2:
The combination of multiple materials with different properties (thermoplastic polyurethane, polyethylene, nylon, spandex, elastomeric blocks) allows performance optimization across different regions of the boot. Each material contributes specific characteristics that can be tailored to regional requirements, enabling customization and performance optimization while using conventional composite manufacturing methods.
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 provides enhanced flexibility and durability, allowing for optimized skate performance and customization across different sizes, while enabling easier attachment of skate components, thereby improving user mobility and design flexibility.
Implementation Method 1
The boot form is made of multiple plastic materials having different hardness properties, or different flexural moduli, and is formed via an injection-molding process or another similar process
Implementation Method 2
One or more of the plastic materials may be reinforced with fibers of glass, carbon, aramid, or another stiffening material to strengthen one or more regions of the boot form
Data Source
AI summary
A boot form for a hockey skate is made of multiple plastic materials having different hardness properties, or different flexural moduli, and is formed via an injection-molding process or another similar process. One or more of the plastic materials may be reinforced with fibers of glass, carbon, aramid, or another stiffening material to strengthen one or more regions of the boot form. For example, pellets of a first plastic material having a flexural modulus of approximately 190 MPa (e.g., a polyamide elastomer block amide) may be injected into a mold to form a softer upper region of the boot form. And pellets of a second plastic having a flexural modulus of approximately 20,000 MPa (e.g., a Nylon 12 with long glass fibers) may be injected into the mold to form a stiffer lower region of the boot form. Additional skate components may then be attached to the boot form.