Foamed PVC Rock Shield Pads via Foam Extrusion
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Solution Overview
Problem
Existing flexible PVC products, such as rock shield pads, face challenges in reducing material consumption and costs while maintaining impact properties and appearance, with conventional methods often sacrificing these qualities for weight reduction.
Innovation Solution
The use of a dry blend formulation containing polyvinyl chloride, a nucleating agent like talcum, and a chemical blowing agent like sodium bicarbonate in specific proportions for foam extrusion, which reduces material weight and plasticizer content while maintaining optical and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the product is made thinner or alternative raw materials are used to reduce material costs and product weight, then material consumption and weight are reduced, but impact properties deteriorate
Solution Approach 1:
The patent applies foam extrusion to create a porous cellular structure within the PVC product. This foam structure reduces material density and weight while the cellular architecture provides energy absorption capabilities that maintain or improve impact resistance. The foam cells act as cushioning elements that dissipate impact energy, resolving the contradiction between weight reduction and impact property preservation.
Solution Approach 2:
The patent creates a composite structure by combining PVC matrix material with foam cells containing gas or vacuum. This composite approach allows the solid PVC framework to provide structural integrity while the foam cells reduce overall density and provide impact cushioning, thereby achieving both weight reduction and maintained impact properties simultaneously.
2Quantity of substance
If the product is made thinner or alternative raw materials are used to reduce material consumption, then material costs are reduced, but appearance deteriorates
Solution Approach 1:
The foam extrusion process creates a controlled porous structure that can be optimized to maintain surface quality. By controlling foam cell size, distribution, and wall thickness, the patent achieves a balance between material reduction and aesthetic appearance, allowing thinner walls with acceptable visual quality while reducing overall material consumption.
3Weight of moving object
If foam extrusion is used to reduce product weight, then weight is reduced, but plasticizer content must be reduced to achieve required flexibility
Solution Approach 1:
The patent utilizes the foam structure itself as the primary mechanism for achieving flexibility, rather than relying on plasticizer additives. The cellular foam architecture provides inherent柔韧性 through its structure, allowing the use of less plasticizer while maintaining the required flexibility. This parameter change shifts the source of flexibility from chemical (plasticizer) to physical (foam structure).
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 allows for the production of foamed PVC products with reduced material consumption and weight, maintaining or improving impact resistance and appearance, thus reducing environmental impact and installation ease.
Implementation Method 1
a chemical blowing agent, in particular sodium bicarbonate
Implementation Method 2
comprising at least one polymer resin which may be polyvinyl chloride, a surface-treated calcium carbonate, and a blowing agent
Implementation Method 3
a nucleating agent, preferably talcum
Data Source
AI summary
A plasticized PVC formulation for foam extrusion including polyvinyl chloride, at least one plasticizer, at least one nucleating agent and a chemical blowing agent, wherein the plasticized PVC formulation is a dry blend containing 0.5 to 5% by weight of one or more nucleating agents and 0.1 to 3% by weight of the chemical blowing agent, wherein the blowing agent is sodium bicarbonate and the nucleating agent is talcum, and a foam extrusion method using said formulation. The extruded plasticized PVC foam is particularly suitable for rock shield pads used for pipeline protection. The foams are lightweight and require less consumption of materials with comparable properties to corresponding solid articles.