Bituminous Membrane Grain Application Drum and Retention System

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Solution Overview

Problem

Existing methods for applying bitumen-based membranes with grain decorations suffer from irregular grain distribution, leading to blurring of decorative patterns and excessive wear on application drums and belts, resulting in increased maintenance and production costs.

Innovation Solution

A system featuring a rigid application drum with cavities for controlled grain distribution, utilizing a sintered polyethylene scraping device to maintain grain retention and reduce wear, and a hopper with adjustable dosing to ensure precise grain placement on the membrane.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a flexible belt is used to retain grains in cavities, then grain retention is improved, but grain distribution uniformity deteriorates due to uncontrolled grain deposition between belt and drum

Engineering Contradiction:

Improvegrain retentionVSAvoidgrain distribution uniformity

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The invention extracts the flexible belt from the system and replaces it with a rigid drum structure. The grain retention function is transferred from the belt to the drum cavities themselves, which are designed to retain grains through their geometric configuration rather than through a separate flexible retaining element.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The drum surface is segmented into multiple cavities, each capable of independently retaining and releasing grains. This segmentation allows for controlled grain distribution patterns while maintaining reliable retention within each cavity during the feeding phase.

Inventive Principle:

Principle #1Segmentation

2Manufacturing precision

If grains are retained between drum and flexible belt, then grain deposition control is improved, but equipment wear deteriorates due to continuous abrasion

Engineering Contradiction:

Improvegrain deposition controlVSAvoiddrum and belt lifespan

Core Design Contradiction:

Manufacturing precisionVSDuration of action of stationary object

Solution Approach 1:

The flexible belt is extracted from the system, eliminating the source of continuous abrasion against the drum. Grain deposition control is achieved through the rigid drum cavity geometry and controlled release mechanisms rather than through friction-based retention with a flexible belt.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention eliminates the need for a flexible belt that requires frequent replacement due to wear. The rigid drum structure is significantly more durable and has a much longer service life, reducing maintenance costs and equipment replacement frequency.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Manufacturing precision

If an occlusion roller made of elastically deformable material is used, then grain compression and drum cleaning are improved, but roller wear deteriorates rapidly

Engineering Contradiction:

Improvegrain discharge controlVSAvoidocclusion roller lifespan

Core Design Contradiction:

Manufacturing precisionVSDuration of action of stationary object

Solution Approach 1:

The elastically deformable occlusion roller is extracted from the system and replaced with a rigid drum structure. Grain discharge control is achieved through the geometric design of the drum cavities and their positioning relative to the membrane, rather than through elastic deformation of a separate roller.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of using a deformable roller to compress and control grain discharge, the invention uses a rigid drum with cavities that naturally control grain retention and release through their geometric configuration and rotational positioning, inverting the approach from active compression to passive geometric control.

Inventive Principle:

Principle #13The other way round (Inversion)

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 system achieves accurate and controlled grain deposition, reducing blurring and wear, thereby enhancing the aesthetic quality and extending the lifespan of application equipment while minimizing waste and maintenance costs.

Implementation Method 1

a rigid application drum with cavities for controlled grain distribution, utilizing a sintered polyethylene scraping device to maintain grain retention

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 2

a hopper with adjustable dosing to ensure precise grain placement on the membrane

Methodology Applied

Scientific EffectGravity: Gravitation

Data Source

PatentUS10760274B2System and method to produce a bituminous membrane superficially covered by grain-based decorations

Publication Date: 2020.09.01 EUROLINE

AI summary

A system to produce a bitumen-based membrane provided with a bituminous surface covered by grains. The system comprises a movement device designed to more a preformed membrane in a predefined feed direction, a grain application machine comprising a rotating application drum provided with a plurality of cavities which are designed to receive grains in a loading region of said drum, a grain loading device designed to load the grains in the cavities in the loading region of the drum, and a grain retention device made of sintered polymer material, which is arranged in contact with a retention region for retaining the outer surface of the application drum so as to maintain the grains in the cavities until the latter reach an angular discharge position.