Twin Screw Extruder Segmented Kneading Design

Solution Overview

Problem

Conventional twin screw extruders are complex and costly due to the need for twin screws along their entire length, which increases material and energy costs, and complicates flow rate calculations.

Innovation Solution

A twin screw extruder design featuring an alternating screw geometry with a single screw in the conveying section, a twin screw configuration in the kneading section, and a single screw in the metering section, reducing the need for multiple screws and simplifying the design.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If twin screws are used along the entire length of the extruder, then mixing and kneading capabilities are improved, but device complexity and manufacturing cost increase

Engineering Contradiction:

Improvemixing and kneading capabilitiesVSAvoidscrew configuration complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The extruder is divided into distinct functional sections: a conveying section with a single screw, a kneading section with twin screws, and a metering section with a single screw. This segmentation allows each section to perform its specific function optimally while reducing overall complexity compared to using twin screws throughout the entire length.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different screw configurations are applied to different sections based on local functional requirements. The conveying section uses a single screw for efficient material transport, the kneading section uses twin screws for intensive mixing, and the metering section uses a single screw for controlled delivery. This local optimization resolves the contradiction by providing high mixing capability where needed without complexity elsewhere.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If twin screws are used along the entire length of the extruder, then mixing performance is improved, but material cost and energy consumption increase

Engineering Contradiction:

Improvemixing performanceVSAvoidenergy consumption

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The extruder is divided into distinct functional sections: a conveying section with a single screw, a kneading section with twin screws, and a metering section with a single screw. This segmentation allows each section to perform its specific function optimally while reducing overall complexity compared to using twin screws throughout the entire length.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different screw configurations are applied to different sections based on local functional requirements. The conveying section uses a single screw for efficient material transport, the kneading section uses twin screws for intensive mixing, and the metering section uses a single screw for controlled delivery. This local optimization resolves the contradiction by providing high mixing capability where needed without complexity elsewhere.

Inventive Principle:

Principle #3Local quality

3Adaptability or versatility

If twin screws are used along the entire length of the extruder, then mixing capability is improved, but flow rate calculation complexity increases

Engineering Contradiction:

Improvemixing capabilityVSAvoidflow rate calculation complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The extruder is divided into distinct functional sections: a conveying section with a single screw, a kneading section with twin screws, and a metering section with a single screw. This segmentation allows each section to perform its specific function optimally while reducing overall complexity compared to using twin screws throughout the entire length.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different screw configurations are applied to different sections based on local functional requirements. The conveying section uses a single screw for efficient material transport, the kneading section uses twin screws for intensive mixing, and the metering section uses a single screw for controlled delivery. This local optimization resolves the contradiction by providing high mixing capability where needed without complexity elsewhere.

Inventive Principle:

Principle #3Local quality

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 design significantly reduces material and energy costs while simplifying the configuration, improving processing efficiency and reducing calculations for flow rates, while maintaining effective mixing and extrusion capabilities.

Implementation Method 1

a first screw provided within the housing and comprising threads

Methodology Applied

Scientific EffectScrew conveying: Screw

Implementation Method 2

a second screw provided within the housing and comprising a threaded portion and a shaft portion devoid of threads

Methodology Applied

Scientific EffectTwin screw kneading:

Data Source

PatentUS9180618B2Twin screw extruder

Publication Date: 2015.11.10 KING ABDULAZIZ CITY FOR SCIENCE AND TECHNOLOGY

AI summary

An extruder is disclosed, and more particularly, a twin screw extruder for mixing, compounding, kneading and/or extruding of materials. The twin screw extruder includes a barrel assembly having a housing. The twin screw extruder further includes a first screw provided within the housing and comprising threads. The twin screw extruder further includes a second screw provided within the housing and comprising a threaded portion and a shaft portion devoid of threads. A drive system which drives the first screw and the second screw.