PVC Cereal Chaff Composite Extrudates With Wood-Like Outdoor Performance
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Solution Overview
Problem
Existing wood-plastic composites for outdoor applications, such as flooring and fencing, suffer from poor paintability, a plasticky feel, and environmental inefficiencies, along with suboptimal mechanical and physical properties like flexural strength, impact resistance, and water absorption.
Innovation Solution
A composite material comprising polyvinyl chloride (PVC) and milled cereal chaff, particularly spelt husk, with controlled particle sizes and additives, is used to produce extrudates that mimic wood in appearance and feel, enhancing mechanical properties and resource efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wood-plastic composites with polyethylene are used, then processability and resource efficiency are improved, but the profile develops a plasticky feel and paintability deteriorates
Solution Approach 1:
The patent changes the material composition parameters by replacing polyethylene with a specific ratio of polypropylene (30-70 wt%) and polyester fibers (10-40 wt%), which fundamentally alters the tactile properties and paintability while maintaining processability through thermoplastic extrusion
Solution Approach 2:
The patent creates a composite material system combining polypropylene matrix with polyester fibers and wood flour (20-60 wt%), where the fiber-reinforced composite structure provides both the desired wood-like feel and improved mechanical properties while retaining thermoplastic processability
2Strength
If rice shells are used as filler, then mechanical properties are improved, but environmental footprint increases due to non-European sourcing
Solution Approach 1:
The patent substitutes imported rice shells with locally available European cereal husks (wheat, barley, rye, oats), which are agricultural by-products that would otherwise be discarded, thereby reducing environmental footprint while maintaining the filler function and mechanical property enhancement
Solution Approach 2:
The patent changes the filler material parameters from rice shells to European cereal husks with controlled particle size distributions (D10, D50, D90 specifications), achieving comparable or superior mechanical properties through optimized local biomass materials
3Manufacturing precision
If cereal chaff particle size is reduced, then homogeneity and surface finish are improved, but water absorption increases
Solution Approach 1:
The patent optimizes the particle size parameters of cereal chaff within a controlled range (D10: 0.1-0.5mm, D50: 0.5-1.0mm, D90: 1.0-2.0mm), achieving a balance where sufficient fineness provides good surface finish while avoiding excessive water absorption associated with very fine particles
Solution Approach 2:
The patent applies different particle size distributions to different functional requirements: finer particles for surface finish and coarser particles for structural integrity, creating a multi-modal size distribution that optimizes both surface quality and water resistance
Data Source
Figure 1~3
AI summary
The present invention relates to a composite material for producing an extrudate comprising PVC and granules of cereal chaff, such as husks, hulls, awns, seed coats and/or stem parts, wherein the cereal is Pooideae and/or Panicoideae and/or Andropogonoideae.