PTFE Powder Hopper Handling for Unfibrillated Conveyance

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Solution Overview

Problem

Polytetrafluoroethylene (PTFE) powders are sensitive to fibrillation during handling and storage, leading to morphological changes that render them unsuitable for downstream applications like battery electrode manufacturing.

Innovation Solution

A system and method involving a hopper with a conical section and a transfer channel, utilizing mechanisms to reduce sticking forces, applying pressure differentials, and maintaining temperatures below the beta transition temperature to convey PTFE powder in a dilute phase, followed by separation to maintain a substantially unfibrillated state.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If PTFE powder is handled and stored in bulk, then productivity and quantity of substance are improved, but the powder undergoes fibrillation and morphological changes

Engineering Contradiction:

Improvebulk handling capacityVSAvoidparticle morphology

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The patent applies pneumatic conveying through a transfer channel where PTFE powder is transported in a dilute phase with gas. This pneumatic transport method enables bulk handling of large quantities of powder while maintaining particle morphology stability by avoiding mechanical contact and friction that would cause fibrillation

Inventive Principle:

Principle #29Pneumatics and hydraulics

Solution Approach 2:

The patent changes the physical state parameters of the PTFE powder by controlling temperature to remain below the beta transition temperature and using pneumatic transport conditions. These parameter changes prevent fibrillation while enabling bulk handling and conveyance of the powder

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If pressure differential is applied to convey PTFE powder in dilute phase, then ease of operation and conveyance efficiency are improved, but energy consumption increases

Engineering Contradiction:

Improveconveyance efficiencyVSAvoidenergy consumption

Core Design Contradiction:

Ease of operationVSUse of energy by moving object

Solution Approach 1:

The system uses pneumatic pressure differential to convey PTFE powder in a dilute phase through a transfer channel. This approach improves conveyance efficiency and ease of operation by enabling continuous, contactless transport, while the energy consumption is managed through optimized pneumatic system design

Inventive Principle:

Principle #29Pneumatics and hydraulics

3Ease of operation

If sticking force is reduced in the hopper, then ease of operation and discharge efficiency are improved, but device complexity increases

Engineering Contradiction:

Improvedischarge efficiencyVSAvoidhopper system complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent reduces sticking force in the hopper by applying pneumatic pressure to prevent powder adhesion to the conical section walls. This pneumatic approach improves discharge efficiency while keeping the device complexity manageable through the use of standard pneumatic components

Inventive Principle:

Principle #29Pneumatics and hydraulics

Solution Approach 2:

The patent changes the physical parameters in the hopper by controlling temperature below the beta transition temperature and adjusting pneumatic pressure. These parameter changes reduce sticking force and improve discharge efficiency without requiring complex mechanical modifications to the hopper structure

Inventive Principle:

Principle #35Parameter changes

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

Enables the bulk handling and conveyance of large quantities of PTFE powder in an unfibrillated form, suitable for dry manufacturing processes, with at least 40% of the input powder recovered as substantially unfibrillated agglomerates for battery electrodes.

Implementation Method 1

applying a pressure differential to the transfer channel to convey the PTFE powder in a dilute phase including a gas and the PTFE powder along the transfer channel

Methodology Applied

Scientific EffectPressure differential: Pressure Gradient

Implementation Method 2

applying a suction to an inlet channel to convey an initial dilute phase can include the PTFE powder along the inlet channel and into the hopper

Methodology Applied

Scientific EffectSuction: Suction

Implementation Method 3

separating the PTFE powder from the gas, in which the separated PTFE powder has a particle morphology that is sufficient for dry manufacturing of film battery electrodes

Methodology Applied

Scientific EffectCyclone separation: Cyclone Separation

Data Source

PatentUS20250304383A1System for handling powdered materials

Publication Date: 2025.10.02 CHEMOURS CO FC LLC THE

AI summary

A method for handling polytetrafluoroethylene (PTFE) powder, the method including receiving PTFE powder into a hopper having a conical section; reducing a sticking force (1) between an inner surface of the conical section of the hopper and the PTFE powder, (2) among particles of the PTFE powder, or both; discharging the PTFE powder from an outlet located near a base of the conical section of the hopper into a transfer channel; applying a pressure differential to the transfer channel to convey the PTFE powder in a dilute phase including a gas and the PTFE powder along the transfer channel; and at an outlet of the transfer channel, separating the PTFE powder from the gas, in which the separated PTFE powder has a particle morphology that is sufficient for dry manufacturing of film battery electrodes.