Millable Polyurethane Belts Using Standard Molding Equipment
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Solution Overview
Problem
The high cost and limited availability of specialized equipment for injection molding, along with the difficult handling characteristics of liquid castable polyurethane, restrict the production and distribution of power transmission belts, leading to increased manufacturing costs and regionalization of production.
Innovation Solution
The use of millable polyurethane, such as polyester- or polyether-based millable polyurethane, in combination with additional elastomers and reinforcing fillers, which can be processed into solid sheets for easier handling and molded using standard equipment, allowing for the production of power transmission belts with surface features like ribs or teeth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If injection molding processing is used with castable polyurethane, then power transmission belts can be manufactured with desired shape and surface features, but the cost of specialized equipment becomes very high and production becomes regionalized
Solution Approach 1:
The patent changes the physical state parameter of polyurethane from liquid (castable) to solid (millable) form. This parameter change allows the material to be processed using standard mixing and molding equipment rather than requiring specialized injection molding equipment, thereby reducing manufacturing costs while still achieving the desired shape and surface features through conventional processing methods
Solution Approach 2:
The patent replaces expensive, specialized injection molding equipment with standard, widely available mixing and molding equipment. This substitution uses common, less expensive equipment that can be found in most manufacturing facilities, eliminating the need for costly specialized machinery while maintaining the ability to produce belts with required precision
2Ease of manufacture
If castable polyurethane is used, then the material can be injected into molds, but the handling characteristics become difficult and control becomes complex
Solution Approach 1:
The patent changes the physical state parameter of polyurethane from liquid (castable) to solid (millable) form. This parameter change transforms the material from a liquid that requires complex injection molding equipment and handling procedures to a solid material that can be easily mixed, handled, and processed using conventional equipment, thereby simplifying both handling and processing complexity
3Productivity
If specialized injection molding equipment is distributed across wider territory, then production capacity increases, but the cost becomes prohibitive
Solution Approach 1:
The patent makes the manufacturing process universal by using standard, widely available equipment that can be found in most manufacturing facilities rather than requiring specialized injection molding equipment. This universality allows production to be distributed across multiple locations without the prohibitive cost of deploying specialized equipment, thereby increasing overall production capacity while maintaining cost-effectiveness
Solution Approach 2:
The patent replaces expensive, specialized injection molding equipment with standard, less expensive mixing and molding equipment that is widely distributed. This substitution enables multiple facilities to be equipped with production capability without the high capital investment required for specialized equipment, thus increasing production capacity while keeping equipment costs low
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
This approach reduces manufacturing costs by enabling production in multiple locations with readily available equipment, increases production capacity, and simplifies material handling, making power transmission belts more cost-effective and widely accessible.
Implementation Method 1
the material is cured to harden the material in the shape of the mold or die
Implementation Method 2
applying heat and pressure to the plurality of layers disposed in the mold to mold together the plurality of layers
Implementation Method 3
applying heat and pressure to the plurality of layers disposed in the mold to mold together the plurality of layers
Data Source
AI summary
Compositions for material layers suitable for use in power transmission belts are described. The composition includes millable polyurethane, such as polyester-based millable polyurethane or polyether-based millable polyurethane, such that material layers formed from the composition are solid but pliable. The disclosed material layers can be used to form the main body portion of power transmission belts, such as synchronous belts, V-belts, and micro-V belts.