Scraper Roller Liquid Film for Fur Fat Removal
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Solution Overview
Problem
Existing fur processing apparatuses face issues with fat and flesh sticking to scraper rollers due to centrifugal forces, reducing the scraping effect and requiring expensive suction systems for cleaning, which can lead to machine breakdowns and maintenance challenges.
Innovation Solution
A fur processing apparatus that uses a liquid spray unit to create a film on scraper blades before contact with the fur, preventing fat and flesh from sticking and allowing them to be easily removed without the need for a suction system, while also reducing the pressure applied to the fur, thereby maintaining quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a suction system is introduced to remove fat and flesh from scraper rollers, then the scraping effect is maintained, but the device complexity and cost increase significantly
Solution Approach 1:
A liquid film (water or other liquid) is introduced as an intermediary substance between the scraper roller surface and the fat/flesh residues. This liquid film prevents the residues from sticking to the scraper blades by creating a barrier layer, allowing them to be easily removed by centrifugal force without requiring a complex suction system
Solution Approach 2:
A liquid spray unit is used to apply a liquid film to the scraper roller surface. This hydraulic approach replaces the need for a complex suction system by using liquid dynamics to prevent adhesion of fat and flesh residues to the scraper blades
2Productivity
If high pressure is applied to scraper rollers to improve scraping effect, then fat and flesh removal is enhanced, but fat is pressed into the pores of the skin reducing fur quality
Solution Approach 1:
The liquid film acts as a mediator that reduces the direct contact and adhesion between the scraper blades and the fat/flesh residues. This allows effective scraping to occur at lower pressures, preventing fat from being forced into the skin pores while still achieving good fat and flesh removal
Solution Approach 2:
The introduction of the liquid film changes the physical parameters of the scraping process by reducing the coefficient of friction and adhesion between the scraper surface and the residues. This parameter change enables effective scraping at reduced pressure levels, thereby protecting the fur quality
3Productivity
If scraper rollers rotate at high speed to throw off fat and flesh, then cleaning efficiency is improved, but fat and flesh still stick to the rollers due to centrifugal forces
Solution Approach 1:
The liquid film serves as an intermediary that prevents fat and flesh from adhering to the scraper blade surfaces. Even at high rotation speeds where centrifugal forces are strong, the liquid barrier ensures that residues do not stick to the blades, allowing them to be effectively thrown off by centrifugal action
Data Source
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AI summary
The invention provides a fur processing apparatus, such as for processing mink fur, with a scraper unit with one or more rotating scraper roller (S) for removing fat and flesh from the leather side of the fur. A liquid spray unit is arranged to spray a liquid (L), e.g. water, onto one or more scraper rollers (S) so as to provide a liquid film (LF) on scraper blades of the scraper rollers (S). Hereby, it is possible to prevent fat and flesh from sticking to the scraper blades, thus destroying the scraping effect of the scraper rollers (S). E.g. water with a temperature of 40-60 °C may be used, and the water is preferably sprayed by means of a nozzle (N) towards one or two scraper blades immediately prior to entering into contact with the fur. In case of skinning machines which processed the fur with a sequence of more than one scraper unit, at least one of the scraper rollers (S) of the first scraper unit in the sequence is preferably sprayed with liquid (L).