DK143658B - PROCEDURE FOR PREPARING A PRESSURE OR PRESSURE COLLECTION - Google Patents

Description

143658

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a method of producing a press or clamping roller, forming a sheath containing a non-woven fiber material on a steel core. Such rollers may, for example, be used in twisting machines to extrude the wet from wet clothing.

Roller bodies for twisting machines and similar apparatus usually consist mainly of solid rubber, the rubber roller body being fixed to a steel core. Solid rubber roller bodies can withstand only 10 mechanical loads, and a large wear must be expected. Therefore, it has also already been proposed to make roll bodies of nonwoven fibrous material, with slices of such fibrous material being axially pressed onto the steel core. Such rollers can usually absorb large mechanical loads. However, it is a disadvantage that this roller body has only a slight elasticity. Rolling bodies, which are intended both for large mechanical stresses and also have a desired elasticity (e.g. to produce nonwoven fibrous material), are novel.

20 From Austrian patent specification No. 12,553, a transport roller is known for textile webs, where a single layer of a helical wound strip of woven material is arranged on a steel core. Such a roller has neither the elasticity nor the resistance required in connection with pressing and clamping rollers.

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The invention seeks to provide a method for producing a press or clamping roll of the type mentioned initially, which has the hitherto not achieved combination of mechanical load capacity and high elasticity. The method according to the invention is characterized in that several coats of rubber and / or plastic reinforced strips of nonwoven fibrous material are wound on the steel core in such a way that the strips intersect with each other and the layers are interconnected with each other. using the rubber and / or plastic reinforcement. It has been found that in this combination of rubber or plastic and nonwoven fiber material, it is possible to obtain the combination of elasticity and resistance to large mechanical stresses required in connection with press or clamping rollers.

2 143658

The manufacture of rollers can be done, for example, by a web of nonwoven fibrous material, e.g. made of fully synthetic stable fibers or endless fibers, made doughy by immersion in a bath of dissolved rubber, or given affinity to rubber by impregnation with a suitable plastic. Both sides of the thus prepared fiber web are compressed by means of a multi-roll calender with unvulcanized rubber layers or coated with plastic. Thereby, the unvulcanized rubber or non-wetted plastic completely penetrates the pores of the fibrous web, so that a later, after wetting, a fiber-reinforced rubber or plastic tape is formed. The yet unvulcanized rubber-reinforced or non-wetted plastic reinforced fiber web is wound helically in the form of narrow strips on a steel core so that the strips intersect with each other. The roller body thus constructed of rubber and / or plastic reinforced fiber web strips is then cured or wetted. Later, the roller body is rotated or ground to become purposeful, centric and smooth.

Rolling bodies of the kind described herein are not only suitable e.g.

20 for the production of nonwoven fiber webs, but also as a drive roller in the steel industry or by using acid-resistant fibers and acid-resistant binder also as rolls for acid, liquor and degreasing baths.

An embodiment of a roller made by the method according to the invention will now be described with reference to the drawing which shows the roller in perspective.

A roller body 2 is secured to a steel core 1 and consists of each other 30 intersecting layers of rubber and / or plastic reinforced strips 3 of a nonwoven fibrous material.

The invention is further illustrated by the following examples:

Example 1.

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Via a card is added a 140 g / m nonwoven fiber material with length-oriented fully synthetic fibers, e.g. of polyester fibers 3.3 - 17 dtex 3 143658 with a length of 60 or 80 mm. This fibrous material is soaked in a Foulard with a mixture of polyurethane dispersion, dried at 150 ° C and condensed for 3 minutes at 180 ° C to give a final weight of 200 g / m and the fiber to binder ratio is 5 70:30 . The fiber material thus produced is cut into e.g. 100 mm webs and wound on a roller body in 2 layers with edge to edge at an angle of e.g. 50 ° and with seam overlap, at the same time a soaking with polyurethane takes place, ie the newly added product (polyester / desmodur / desmophen) 10 is applied to fiber material with a wetting agent (eg glycol) at 120 ° C. Fiber material ratio: PU 5 1: 3,

Then, this roller is moistened for 48 hours at 110 ° C and the roller body is then molded to measure and centricity, turning or grinding the surface depending on the application.

Example 2.

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20 A 100 g / m nonwoven fiber material with length oriented fully synthetic fibers (eg nylon 6.6 - 20 dtex, length 60 or 80 mm) is added. This fiber material is soaked in a Foulard with a latex dispersion (e.g., butadiene / styrene / vinylpyridine latex combined with resorcin resin ratio 80:20), dried at 150 ° C

25 and condensed for 3 minutes at 180 ° C, whereby the final weight o becomes 167 g / m and the fiber to binder ratio becomes 60:40.

Then, the fibrous material is made doughy in a rubber solution and / or rubberized on a multi-roll calender with rubber foils having a weight of 800-1000 g / m. Thereby, the unvulcanized rubber penetrates completely homogeneous pores of the fibrous material. The fiber material thus prepared with unvulcanized rubber is then cut into e.g. 10 mm webs and wound with edge to edge at an angle of e.g. 40 ° layer by layer on the steel core. The thus produced roller body is then vulcanized for 4 hours in an autoclave at 143 ° C. Then, the roller body is molded into mold and centricity, with the surface being peeled or abraded as needed. The rubber compound can be formulated to become acid and chemical resistant.