Thermoplastic Polyolefin Articles Using Shear Mixing
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Solution Overview
Problem
There is a need for thermoplastic polyolefin materials that reduce dependency on energy-consuming compounding steps and pre-fabricating processes, especially those involving heat history, to address rising raw material and energy costs while maintaining mechanical properties.
Innovation Solution
A process involving separate polyolefin and particulated filler materials blended at elevated temperatures using shear forces within an injection molding machine, forming a molten blend without prior compounding, and shaping the blend to create articles with improved mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If traditional compounding steps are used to prepare thermoplastic polyolefin materials, then material homogeneity and processing stability are improved, but energy consumption increases and heat history degrades material properties
Solution Approach 1:
The invention combines the compounding and injection molding operations into a single integrated process. The masterbatch containing filler and polymer is directly fed into the injection molding machine along with the base polymer, eliminating the need for separate compounding steps. This merging of operations reduces energy consumption while maintaining material homogeneity through in-machine mixing.
Solution Approach 2:
The invention prepares the masterbatch in advance with the filler and polymer pre-mixed, but keeps it separate until the injection molding stage. This preliminary preparation allows the filler to be pre-distributed in a carrier polymer, reducing the mixing energy required during injection molding while ensuring homogeneous distribution in the final product.
2Reliability
If pre-fabricating compounding steps with heat treatment are applied, then material processing stability is improved, but heat history accumulates and mechanical properties deteriorate
Solution Approach 1:
The invention segments the processing into two distinct stages: masterbatch preparation (with controlled heat treatment) and injection molding (minimal heat history). By separating these operations and using the masterbatch as an intermediate carrier, the filler experiences heat treatment only once during masterbatch making, while the final product undergoes minimal thermal processing, preserving mechanical properties.
Solution Approach 2:
The masterbatch acts as an intermediary carrier that pre-loads the filler particles in a polymer matrix. This intermediary form allows the filler to be pre-treated and stabilized without subjecting the final product to repeated heat cycles. The masterbatch serves as a stable intermediate that can be stored and then directly processed with minimal additional heating.
3Use of energy by moving object
If separate polyolefin and filler materials are blended without prior compounding, then energy consumption is reduced, but manufacturing complexity increases
Solution Approach 1:
The injection molding machine is used for dual purposes: as both the injection molding device and the mixing/compounding device. The machine's screw and barrel system, already present for molding, is utilized to blend the masterbatch with base polymer and distribute filler particles. This multi-functionality eliminates the need for separate compounding equipment, reducing manufacturing complexity despite the combined operations.
4Quantity of substance
If masterbatch with high filler content is used, then material cost is reduced, but blending difficulty and processing complexity increase
Solution Approach 1:
The masterbatch serves as an intermediary that pre-solves the blending difficulty by having filler particles already dispersed in a carrier polymer. High filler content (45-85 wt%) is achieved in the masterbatch through controlled preparation, and this pre-dispersed form is then easily incorporated into the final product during injection molding without requiring intensive mixing, thus maintaining ease of manufacture.
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 process results in thermoplastic articles with enhanced mechanical properties, reduced energy consumption, and minimized heat history, achieving comparable or superior performance to traditionally compounded materials while lowering production costs.
Implementation Method 1
applying a shear force to the first and second materials, while the materials are at an elevated temperature for blending the materials to form a molten blend
Implementation Method 2
applying a shear force to the first and second materials, while the materials are at an elevated temperature for blending the materials to form a molten blend
Data Source
AI summary
The present invention is directed to improved processes for making plastic articles, and articles made therefrom. In a broad aspect, the invention is directed to improved processes and articles made therefrom, that include the steps of providing as separate materials a first material that includes a polyolefin, a second material including an admixture of from about 45 to 85 wt. % of the total admixture of at least one particulated mineral filler; and from about 15 to 55 wt. % of the total admixture of at least a second polyolefin having a melt index greater than about 150 g/10 min at 190° C./2.16 kg, as measured per ISO 1133 (condition D); applying a shear force to form a molten blend; shaping the molten blend and solidifying the molten blend.