Method for fastening hides to a drying frame by magnetic attraction and magnetic system suitable for implementing this method

Abstract

A method for fastening leather to be dried to a frame by magnetic attraction, comprising the following operations: laying leather (P) to be dried on a frame (10) made of ferromagnetic material, and ) a plurality of magnetic bodies (20) are arranged on the edge to constrain the leather (P) to the frame (10). The frame (10) is provided with a plurality of through holes (14), and each of the magnetic bodies (20) is accommodated in a corresponding through hole (14) of the frame (10), and passes through the through holes ( The leather (P) is constrained by the frictional force of the perimeter edge (14a) of 14) generated by the mutual magnetic attraction between the magnetic body (20) and the frame (10). The magnetic body (20) has a spherical shape, and the through hole (14) has a circular shape.

Description

technical field [0001] The invention relates to a method for fastening hides to a drying frame by magnetic attraction and a magnetic system suitable for implementing such a method. Background technique [0002] In the tanning industry, leather is subjected to various types of treatments for the preservation and workability of the leather itself. [0003] One of the necessary treatments that leather must undergo after tanning in order to make it workable is drying. [0004] This treatment is necessary in order to remove the water that has been absorbed by the hides during wet processing, and is usually carried out using dryers, ie units in which wet hides come into contact with heated drying air, lose the moisture they contain and are thus dried. dry. [0005] A known drying method envisages laying the leather to be dried on a perforated frame made to be transported along drying channels in which hot air is kept circulating. [0006] In order to spread the hide and prevent...

AI Technical Summary

Problems solved by technology

[0017] However, fastening via magnetic elements has some recognized disadvantages

[0018] The first recognized disadvantage is that, in order to be able to guarantee the grip of the leather edge to the frame, the magnetic element must have a larger support surface, so that the magnetic force generated between the magnetic element and the frame surface is such that a large enough force is generated between the leather and the frame. friction to prevent leather from sliding during drying

However, the very large support surface makes it difficult to remove the magnetic element from the frame, and this causes some difficulties for the operator during the operation of removing the dried leather from the frame

[0019] Consequently, operator intervention time is increased, and thus costs are increased

Another disadvantage consists of the fact that the combination of a large support surface and a high magnetic force leads to a significant permanent deformation of the leather in the area where the magnetic elements are arranged

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