Reduced-Friction Welding Rod Drive for Tube-Forming Sheets

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Solution Overview

Problem

Existing drive devices for continuously welding sheets into tubes generate excessive friction between the sheet and the welding rod, leading to abrasion and dust accumulation at high production speeds, especially with new or recycled materials, affecting tube quality and rod wear.

Innovation Solution

Incorporation of antifriction belts or rollers to reduce friction between the sheet and the welding rod, with the belts moving at the same speed as the sheet or driven by a motor, and optionally using surface treatments or coatings to enhance the friction coefficient ratio, along with adjustable belt widths and materials.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If drive belts are used to drive the sheet at high speed, then productivity is improved, but friction between the sheet and welding rod increases causing abrasion and dust accumulation

Engineering Contradiction:

Improveproduction speedVSAvoidabrasion and dust

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

An antifriction belt is introduced as an intermediary element between the sheet and the welding rod. This mediator reduces direct contact and friction between the sheet and rod, preventing abrasion and dust generation while allowing high-speed operation to continue

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If drive belts are used to drive the sheet, then the sheet can be moved along the welding rod, but friction causes premature wear of the rod due to slip agents

Engineering Contradiction:

Improvesheet drivingVSAvoidrod lifespan

Core Design Contradiction:

Ease of operationVSDuration of action of stationary object

Solution Approach 1:

The antifriction belt serves as a mediator that reduces direct friction between the sheet (with slip agents) and the welding rod, thereby protecting the rod from premature wear while maintaining the driving function

Inventive Principle:

Principle #24Intermediary (Mediator)

3Power

If the sheet slides on the welding rod during driving, then drive belts can be used for propulsion, but friction affects the inner face of the tube especially at low speeds with new or recycled materials

Engineering Contradiction:

Improvedrive forceVSAvoidinner face quality

Core Design Contradiction:

PowerVSManufacturing precision

Solution Approach 1:

The antifriction belt is positioned to contact the inner face of the sheet, acting as a mediator that prevents direct sliding between the sheet and welding rod, thereby protecting the inner face quality while allowing the drive belts to maintain their propulsive function

Inventive Principle:

Principle #24Intermediary (Mediator)

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

Significantly reduces friction, minimizing abrasion and dust generation, thereby improving tube quality and extending rod lifespan.

Implementation Method 1

The disadvantage with the existing devices is the generation of friction between the inner face of the sheet and the welding rod

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS12427728B2Reduced-friction drive device

Publication Date: 2025.09.30 AISAPACK HLDG SA

AI summary

Device for forming a tube, for example a packaging tube, from a sheet (3), said device comprising at least one welding rod (2), means for welding and pressurizing the welded zone (7-9) and means (4-6) for driving the sheet (3) along the rod (2). The device also comprises means (10-12, 14) that reduce the friction between the welding rod (2) and the sheet (3).