SK50132005A3 - Device for preparing rubbered fabric cord suitable for use as a wound breaker overlay - Google Patents

Abstract

Described is a device for manufacturing rubberized fabric cord, suitable to be used as wound overlapping belt and used in radial tyre production, comprising section (1) of unwinding stations for individual cord threads, a plasma unit (2), a transversely arranged rubberizing extruder (3), a cooling unit (4), a longitudinal slitting machine (5) and a section (6) of winding stations for rubberized fabric cord.

Description

Technical field

The invention relates to an apparatus for preparing a rubberized textile cord used in the manufacture of radial car tires, wherein the preparation of the rubberized textile cord is carried out by rubberizing individual textile fibers whose adhesion is modified by application of plasma.

BACKGROUND OF THE INVENTION

In the process of producing radial car tires, a wound overlapping bumper, also called a spiral bumper, as part of the buffer wrap significantly improves the performance of radial car tires. In fact, a wound overlapping bumper is a strip of rubberized cord of a certain width (usually 1 to 20 mm), which is spirally wound in the car tire production line on the previous bumper layers of the bumper-tread packaging. The positive effect of the use of a wound overlapping bumper in a car tire is manifested in particular by reducing the rolling resistance of the tire, increasing its high-speed performance and increasing steering power and service life.

The actual preparation of the wound overlapping bumper consists of rubberizing the textile cord and subsequent operations. However, the textile cord must be chemically treated prior to the rubberization to obtain sufficient adhesion necessary for a good rubberizing process. Subsequently, the rubberized cord is cut lengthwise to the final width. The cutting is usually carried out in two stages. The chemical treatment of the textile cord is associated with significant negative environmental impacts and increases the overall cost of preparing the wound overlapping bumper.

Hitherto known devices for the preparation of a rubberized textile cord suitable for producing a wound overlapping bumper employ a three-step method of manufacturing a wound overlapping bumper. Initially, the rubber cord is usually rubberized on a 4-roll rubberizing machine. The textile cord entering the rubberizing device is chemically adhesive treated. Adhesion is essential for the perfect rubberizing process and the resulting qualitative properties of the rubberized cord

-2plášťov. After the rubber coating, the rubberized textile cord is wound into reels which are the second stage inlet.

The second stage consists of another device - a rubberized textile cord cutter to a width of about 80 to 100 mm. After rubberizing, the rubberized textile cord is wound into reels which are the third stage inlet.

Subsequently, the coils with a rubberized cord are cut in a third stage, which consists of a further cutting device, where the cutting produces the final width of the coiled overlapping bumper, which is wound on the coils and subsequently used in ready-made lines.

The disadvantages of this method of preparing a rubberized textile cord for a wound overlapping bumper are the higher production costs resulting from the higher cost of the adhesive treated textile cord, the necessity to operate the respective equipment, handling of the material reels, higher energy intensity and negative environmental impact.

Another known apparatus for preparing a rubberized textile cord consists of a one-step method. The device consists of unwinding stations of individual cord threads, extruder, cutter and winders. The cord threads then enter the head of the transversely mounted extruder where the ribbon of incoming threads is rubberized. The individual cord threads entering the rubberizing device are chemically adhesive treated. Adhesion is essential for the perfect rubberizing process and the resulting qualitative properties of the rubberized textile cord. After rubberizing, the rubberized textile cord is cut to final width, wound into reels and subsequently used in ready-made lines.

The disadvantage of said method of preparing a rubberized textile cord is the higher production costs resulting from the higher cost of the adhesive treated cord threads and the negative environmental impact.

The solution to this problem is a device for preparing a rubberized textile cord, wherein the rubberized textile cord is prepared by directly rubberizing the textile fibers with a transversely placed extruder, wherein the adhesion of the textile fibers prior to rubberization is adjusted by plasma application.

3. Summary of the Invention

The above-mentioned disadvantages of the rubberized cord preparation device used in the manufacture of radial car tires are overcome by the technical solution of the device according to the invention, which consists in the section of unwinding stations of individual cord threads, plasma unit, crosswise rubberized extruder, sections of winding stations of rubberized textile cord.

The winding station section of the device according to the invention may comprise the same or fewer number of winding stations for the rubberized textile cord than the winding section of the individual cord threads.

The individual non-adhesive cord threads are unwound from the unwinding stations and enter the plasma unit. In the plasma unit, the surface layer of the cord threads is treated by means of a low temperature plasma, resulting in an increase in the adhesion required to subsequently rubberize the cord threads. Upon exiting the plasma unit, the adhesive coated cord threads enter the head of the transversely mounted extruder where they are rubberized with a rubber composition. The rubberized textile cord cord of the appropriate width advances to the cooling unit for cooling. Subsequently, the rubberized textile cord is cut longitudinally to the final width and the individual strips of the rubberized textile cord are wound in reel winding stations.

The advantage of the apparatus for preparing a rubberized textile cord suitable for use as a wound overlapping bumper is that it achieves a reduction in cord costs, a reduction in energy costs, an increase in the production process efficiency, a reduction in car tire weight and a positive environmental impact.

Overview of the figures in the drawing

An apparatus for preparing a rubberized textile cord suitable for use as a wound overlapping bumper used in the manufacture of radial car tires according to the invention is explained in more detail in the accompanying drawing, where the apparatus for preparing a rubberized textile cord used in the manufacture of radial car tires is illustrated. is carried out by means of

-4 rubbering of individual textile fibers whose adhesion is modified by application of low temperature plasma.

DETAILED DESCRIPTION OF THE INVENTION

The apparatus for preparing a rubberized textile cord used in the manufacture of radial car tires consists of a section 1 of the unwinding stations of individual cord threads, a plasma unit 2, a transversely mounted rubberizing extruder 3, a cooling unit 4, a longitudinal cutting device 5 and a section 6 cord.

The individual non-adhesive cord threads are unwound from the unwinding stations of section 1 and enter the plasma unit 2. In the plasma unit 2, the surface layer of the cord threads is treated by means of low temperature plasma, resulting in the adhesion required to subsequently rubberize the cord threads. Upon exiting the plasma unit 2, the cord threads with an adhesive layer enter the head of the transversely mounted extruder 3 where they are rubberized with a rubber mixture. The rubberized cord of 40 mm wide cord passes to the cooling unit 4 for cooling. Subsequently, the rubberized textile cord is longitudinally cut into 4 pieces to a final width of 10 mm in this case in the cutter 5, and the individual coils of the wound overlapping bumpers are wound on reels at the winding stations of section 6. The nominal rubberizing speed was 25m / min.

Industrial usability

The process according to the invention is applicable in the rubber industry in the manufacture of radial car tires.

Claims (3)

PATENT CLAIMS An apparatus for preparing a rubberized textile cord suitable for use as a wound overlapping bumper, used in the manufacture of radial car tires, characterized in that it consists of a section (1) of unwinding stations of individual cord threads, a plasma unit (2), a transversely mounted rubberizing extruder ( 3), a cooling unit (4), a longitudinal slitting device (5) and a section (6) of winding stations of a rubberized textile cord. Apparatus according to claim 1, characterized in that the winding station section (6) has the same number of rubberized textile cord winding stations as the winding station section (1) of the individual cord threads. Device according to claim 1, characterized in that the winding station section (6) is provided with a smaller number of winding stations for the rubberized textile cord than the winding station section (1) of the individual cord threads.