Dual Roller With Replaceable Rails for Compression Without Tearing

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Solution Overview

Problem

Existing dual rollers for compressing and puncturing items like bottles and cans suffer from high wear of cutting teeth, leading to costly replacements and unintended tearing of packaging, which complicates recycling by mixing different materials.

Innovation Solution

A dual roller design with replaceable longitudinal rails acting as crushing teeth, distributed force transfer, and adjustable gap control, ensuring items are compressed without unintended tearing and allowing for easy replacement of worn parts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If cutting teeth are used on pressing rollers to tear packages apart, then packages can be separated for processing, but material mixing occurs during recycling and unintended tearing happens

Engineering Contradiction:

Improvepackage separationVSAvoidmaterial mixing and unintended tearing

Core Design Contradiction:

Ease of operationVSObject-generated harmful factors

Solution Approach 1:

The roller surface is segmented into multiple longitudinal rails that are replaceable independently. Each rail acts as a separate cutting element, allowing the system to separate packages without causing unintended tearing or material mixing, as the segmented structure provides controlled separation points.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system transitions from fixed cutting teeth to dynamic, replaceable longitudinal rails. The rails can be adjusted and replaced based on operational needs, enabling controlled package separation while preventing harmful unintended tearing through adaptable cutting geometry.

Inventive Principle:

Principle #15Dynamics

2Productivity

If cutting teeth on rollers are used to compress and tear packages, then packages can be separated, but the teeth wear down significantly requiring expensive and time-consuming roller replacement

Engineering Contradiction:

Improvepackage processingVSAvoidroller replacement cost and time

Core Design Contradiction:

ProductivityVSEase of repair

Solution Approach 1:

The roller is segmented into multiple independent longitudinal rails that can be replaced individually rather than replacing the entire roller. This segmentation allows worn cutting edges to be renewed by swapping only the affected rails, significantly reducing maintenance time and costs while maintaining continuous package processing capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The longitudinal rails are designed as consumable components that can be easily discarded when worn and replaced with new rails. The main roller body is recovered and reused, separating the disposable cutting elements from the valuable roller structure, thereby reducing overall maintenance costs and time.

Inventive Principle:

Principle #34Discarding and recovering

3Volume of stationary object

If pressing rollers with meshing teeth are used to compress items, then volume reduction is achieved, but the concentrated force causes fracture of the compression teeth

Engineering Contradiction:

Improvecompressed item volumeVSAvoidcompression tooth durability

Core Design Contradiction:

Volume of stationary objectVSStrength

Solution Approach 1:

The cutting action is transitioned from concentrated point contact to distributed linear contact along the longitudinal rails. By extending the cutting edge from a point to a line along the roller length, the force is distributed across multiple contact points, preventing tooth fracture while achieving effective package compression and separation.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The geometry of the compression elements is changed from short teeth to long longitudinal rails, fundamentally altering the force distribution parameters. This parameter change distributes the compressive and cutting forces along the length of the rails, preventing localized stress concentration that would cause tooth fracture.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20260014603A1A dual roller for compressing and/or puncturing plastic or metal items and use of the rollers

Publication Date: 2026.01.15 VARIG GRP APS

AI summary

A dual roller (1) for compressing and/or puncture plastic or metal items comprising a first roller (3) and a second roller (4) having parallel axes (5a,b) rotatable mounted in a housing (6) and a drive mechanism (7) for rotating the rollers (3,4) synchronously opposite one another. The outer surfaces (28) of each roller (3,4) comprise an assembly of alternating protruding elements (8) extending from the surface (28). Spacers (9) are arranged so the protruding elements (8) of one roller extend radially into the spacers (9) between adjacent protruding elements (8) on the opposite roller in an alternating manner. The protruding elements (8) are longitudinal rails (11) arranged parallel with the axes (5a,b) of the rollers (3,4, attached to the circumferential surface (28) of the rollers (3,4).