DE102009026215A1 - Reinforcement for e.g. belt layer, of pneumatic tire of passenger car, has two sub-mono filaments contacting with each other at intersection line and twisted with each other in helix shape over length of monofilament - Google Patents

Abstract

The reinforcement (1) has two sub-mono filaments (2) contacting with each other at an intersection line (3), where the reinforcement is designed as a hybrid monofilament. The sub-mono filaments are twisted with each other in a helix shape over length of the monofilament, where semi-diameters of the intersection lines increase radially from an outer side (4) up to a middle side (6) of a cross section of the mono filament. The mono filament exhibits round or oval cross section, and a sealed package is provided in the reinforcement. The mono filament and the sub-mono filament are made of short fibers, metal, metal alloy, glass or ceramics.

Description

The The invention relates to a reinforcement for elastomeric products, in particular for a belt layer or a belt bandage a pneumatic vehicle tire.

When strengthening support for elastomers Products are used cords and monofilaments. Cords, in particular Steel cords are as strength carrier The skilled worker well known. Textile cords usually show a construction of a first twisted yarn of a first material and a second twisted yarn of a second material on, with both yarns are end twisted together. adversely On cords, however, is that air channels between the twisted yarns remain that are poorly penetrable with rubber, so for example Steel cords tend to corrode. It is also disadvantageous that the cord has a small "packing density" through the remaining air channels, whereby the diameter of the cord is comparatively large and when embedding the reinforcing agent to the elastomer layer this therefore comparatively thick. It is an increased use of materials required for embedding, so the cost of the location and the weight of the layer and thus of the elastomeric product containing these layers is disadvantageously high.

since For some time now developments have gone, monofilaments as reinforcements in elastomer products, especially in vehicle tires. The monofilaments should the usual multifilament or replace steel cords as a strength carrier, which so far Use in elastomer products, especially in vehicle tires found to have. Advantages of using monofilaments are, for example a cost-effective Production of monofilaments and weight savings. Under "monofilament" is a To understand filament, which has a diameter greater than or equal 0.3 mm.

at However, there is the use of monofilaments in elastomer products u. a. the problem is that these, when along their length stressed on pressure, tend to break and thus the durability of the elastomer product can decrease.

Of the Invention is based on the object of providing a stable strength element, the cost-effective in its manufacture and light in weight.

Is solved the task according to the invention in that the strength member a Monofilament is that the monofilament consists of at least two partial monofilaments which exists each other - im Cross-section of the monofilament viewed - along a cutting line touch, wherein the cutting line consists of at least two half diameters, which from radially outside extend in the cross-sectional center of the monofilament and that the partial monofilaments on the Length of the Monofilament helical twisted together.

Of the Reinforcement according to the invention is a Monofilament composed of partial monofilaments is. The monofilaments are-in cross-section of the monofilament considered like pie pieces separated by the cut lines. The cut lines pull through the monofilament completely in its longitudinal extent. Touch the part monofilaments over the entire width of the cut lines, where the cut lines are half-diameter are. It is a strength carrier achieved a dense packing and no air channels in his Inside has. The strength element is comparatively light in weight, but can still occur during its use Forces good take up. Even under pressure on pressure of this strength agent tends his twisted construction does not break.

"Half diameter" means here radius.

Advantageous it is when the strength carrier off two to ten partial monofilaments, preferably from two to four Part monofilaments exists. Thus, the monofilament consists - in cross section considered - off Partial monofilaments arranged like "pie pieces" are. The partial monofilaments can the same size or be different in size, so that the strength carrier may be symmetrical or asymmetrical.

Is appropriate it, if the diameter of the monofilament between 0.5 mm and 5 mm, preferably between 1.0 mm and 2.0 mm. Herewith is a strength carrier with comparatively small diameter, but due to the high packing density with excellent strength properties such as modulus, fatigue resistance and bending strength created. Due to its small diameter is comparatively little elastomer for embedding the reinforcement layer needed.

It is advantageous if the partial monofilaments are twisted together with a helical angle (α) of 15 ° to 60 °, preferably of 15 ° to 35 °. The "helix angle" corresponds to a "twist angle". The twist angle (α) is the angle enclosed by the longitudinal edge of the twisted monofilament with the longitudinal axis of the strength member. Due to a suitable twist angle optimal strength properties can be achieved. If the twist angle (α) is <15 °, the com pression properties deteriorated. If the twist angle (α) is> 60 °, the modulus and tensile strength are too low for use in the elastomer product, preferably in the vehicle tire.

Advantageous is it when the helical twisted, consisting of monofilaments monofilaments one approximately circular or have an approximately oval cross-section. In the case of an oval cross-section of the monofilament, this is done in such a way that that one originally a circular cross-section having, helically twisted monofilament flattened to an oval cross-section and preferably with its largest diameter parallel to the flat Extension of the position in which it is embedded, is arranged.

In a particular embodiment consists of the strength element from a single material of a synthetic material or a metal or a metal alloy or glass or ceramic. Under the term "synthetic Materials " Materials such as PET, PEN, POK, aramid, nylon 6, nylon 6.6, nylon 4.6, thermotrophic aromatic polyester understood.

In another embodiment is the strength carrier a hybrid monofilament whose partial monofilaments are made of different Materials such as synthetic materials and / or metals or Metal alloys and / or glass and / or ceramic. hereby the strength element is special good in its properties to the requirements of the elastomer product customizable.

Is appropriate it if short fibers of synthetic materials in the matrix a synthetic material of the monofilament part are, wherein the short fibers with their longitudinal extent parallel to Helical angle of the partial monofilament are extended. By the interference of short fibers are the properties of the strength member particularly well adaptable to the requirements in the elastomer product.

In another embodiment The cutting line can be curved or wavy accomplished so that in one of two partial monofilaments existing Monofilament the section line of a partial monofilament concave and that of the other monofilament is convex.

Of the the aforementioned reinforcements can be used in components of vehicle tires, for example in the belt position, in the bandage or in the carcass.

Of the described reinforcement can be used in components of tires, for example in belt layers, in the bandage or in the carcass, find application. Other features, Advantages and details of the invention will now be described with reference to the drawings, the schematic embodiments represent, closer explained.

It show the:

1 a three-dimensional view of a portion of a twisted, consisting of two partial monofilaments inventive strength member;

2 a three-dimensional view of a portion of a twisted, consisting of two partial monofilaments hybrid inventive strengthener;

3 a three-dimensional view of a portion of a twisted, consisting of four part monofilaments inventive strength member;

4 a three-dimensional view of a portion of a twisted, consisting of four part monofilaments inventive reinforcing material with short fibers.

The 1 shows a three-dimensional view of a portion of a twisted, two partial monofilaments 2 existing symmetrical reinforcement according to the invention 1 , The reinforcement is a monofilament 1 with a circular cross-section and has the construction 2 × 1. That means that two partial monofilaments 2 the monofilament 1 form. The two part monofilaments 2 touch each other at a cutting line 3 , where the cutting line 3 from two half diameters 4 is formed, which from the outside radially 5 in the center 6 the cross section of the monofilament 1 run. The partial monofilaments 2 are over the length of the monofilament 1 helical with a helix angle (α) of 25 ° twisted together. The monofilament 1 has a round cross section with a diameter (D) of 1.3 mm. The partial monofilaments 2 consist of PET.

The 2 shows a three-dimensional view of a portion of a twisted, two partial monofilaments 2 existing reinforcing agent according to the invention 1 , The monofilament 2 of the 2 differs from the monofilament of 1 in that it is a hybrid monofilament, with a partial monofilament 2a made of a high modulus material, here is PET, while the other part monofilament 2 B made of a low-modulus material, here PA 6.6.

The 3 shows a three-dimensional view of a portion of a twisted, four-part monofilaments 2 existing reinforcing agent according to the invention 1 , The strength carrier is a monofilament 1 and has the construction 4 × 1. That means four partial monofilaments 2 the monofilament 1 form. Each of the four partial monofilaments 2 has the same size. The monofilament 1 has a symmetrical construction. The four part monofilaments 2 touch each other at two cutting lines 3 , where the cutting lines 3 from four half diameters 4 exist, which from the outside radially 5 in the center 6 the cross section of the monofilament 1 run. The partial monofilaments 2 are over the length of the monofilament 1 helical with a helix angle (α) of 25 ° twisted together. The monofilament 1 has a round cross section with a diameter (D) of 1.3 mm. The partial monofilaments 2 consist of PET.

The 4 shows a three-dimensional view of a portion of a twisted, four-part monofilaments 2 existing reinforcing agent according to the invention 1 with short fibers 7 , The strength carrier 1 of the 4 is different from that in the 3 described reinforcement 1 in that in each sub-monofilament 2 into the matrix of PET short fibers 7 are included. The short fibers 7 are aligned with their longitudinal axis parallel to the helix angle (α) and close with the longitudinal axis (arrow) of the monofilament an angle (β) of 25 °. The short fibers are made of aramid.

Be carried out in accordance with the invention strength carrier preferably as a strength carrier used in tires and / or tire components, in particular in the Carcass, in the belt of passenger cars or in a bandage covering the belt or Spulbandage, in which the strength carrier in or substantially run oriented in the circumferential direction of the tire. belt bandages with such reinforcements can the durability and high-speed capability of tires clearly improve.

LIST OF REFERENCE NUMBERS

1

Strengthening support / monofilament

2

Mono-parts

3

intersection

4

Half diameter

5

radial Outside

6

center of the monofilament cross-section

7

short fiber

8th

longitudinal axis

D

diameter of the monofilament

α

twist monofilament

β

Angle, the short fiber with the longitudinal axis of the Includes monofilament

Claims (11)

Reinforcements ( 1 ) for elastomeric products, in particular for a belt layer or a belt bandage of a pneumatic vehicle tire, characterized in that the strength element is a monofilament ( 1 ) is that the monofilament ( 1 ) of at least two partial monofilaments ( 2 ), which - in cross-section of the monofilament ( 1 ) - at a cutting line ( 3 ) touching each other, the section line ( 3 ) of at least two half diameters ( 4 ), which from radially outside ( 5 ) in the center ( 6 ) of the cross section of the monofilament ( 1 ) and that the partial monofilaments ( 2 ) over the length of the monofilament ( 1 ) are helically twisted together. Strength according to claim 1, characterized in that this consists of two to 10 part monofilaments ( 2 ), preferably from two to four part monofilaments ( 2 ) consists. Strength according to claim 1 or 2, characterized in that the diameter (D) of the monofilament ( 1 ) is between 0.5 mm and 5 mm, preferably between 1.0 mm and 2.0 mm. Reinforcement according to one of claims 1 to 3, characterized in that the partial monofilaments ( 2 ) with a helix angle (α) of 15 ° to 60 °, preferably from 15 ° to 35 ° are twisted together. Reinforcing member according to one of claims 1 to 4, characterized in that the monofilaments ( 1 ) have an approximately round or an approximately oval cross-section. Reinforcing member according to one of the preceding claims, characterized in that the monofilament ( 1 ) consists of a single material of a synthetic material or a metal or a metal alloy or glass or ceramic. Reinforcing member according to one of the preceding claims 1-5, characterized in that the monofilament ( 1 ) is a hybrid monofilament whose partial monofilaments ( 2 ) consist of various materials such as synthetic materials and / or metals or metal alloys and / or glass and / or ceramic. Reinforcement according to one of claims 6 or 7, characterized in that short fibers of synthetic materials are contained in the matrix of synthetic material, the short fibers with their longitudinal extent parallel to the helical angle (α) of the monofilament part ( 2 ) are extended. strengthening support according to one of the preceding claims, characterized that the cutting line is arcuate or wavy accomplished is. Use of the reinforcement ( 1 ) according to one or more of claims 1 to 9 as strength carrier ( 1 ) in components of vehicle tires, for example in the belt layer, in the bandage or in the carcass. Vehicle tire, characterized in that the vehicle tire reinforcement ( 1 ) according to at least one of the preceding claims 1 to 10.

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