GB2183263A

GB2183263A - Conveyor belt

Info

Publication number: GB2183263A
Application number: GB08625076A
Authority: GB
Inventors: Hasso Tonn; Peter V Scheliha; Jurgen Niemeyer; Christian Heidelmann
Original assignee: Phoenix AG
Current assignee: Phoenix AG
Priority date: 1985-10-24
Filing date: 1986-10-20
Publication date: 1987-06-03
Also published as: GB2183263B; BE905638A; FR2591574A1; FR2591574B1; DE3631245A1; DE3631245C2; GB8625076D0

Abstract

A conveyor belt of rubber, rubber-like plastics or plastics-like PVC with one or more woven inlays which consist of polyester warp and polyamide weft, an additional bearing warp material being associated with the polyester warp. The essential feature of this invention consists in the additional warp material not being twisted with the polyester warp yarn and the proportion of polyester in the warp amounting to 51 to 70%. The additional material may be polyamide, arylamide, polyvinylalcohol polyvinylacetate cotton or rayon.

Description

SPECIFICATION Conveyor belt This invention relates to a conveyor belt of rubber, rubber-like plastics or plastics-like PVC with one or more woven inlays which consist of polyester warp and polyamide weft, an additional bearing warp material being associated with the polyester warp.

It is a fundamental requirement of conveyor belts having woven inlays that the warp threads of the woven inlay have high strength and at the same time are of low stretch. These properties are fulfilled by polyester to a particular degree so that today the woven inlays of conveyor belts preferably exhibit polyester warp threads. The weft threads consist customarily of polyamide.

Conveyor belts having a polyester warp E and a polyamide weft P are designated as EP-belts (Fordergurthandbuch, C. Scholtz, 1967, page 406). In that case polyester and polyamide are present as twist or yarn (DIN 60 900).

EP-belts frequently have available another additional material Y in the warp direction which may be non-bearing or bearing, in which case this respect the state of the art just has to be collected.

Non-bearing covering and/or bonding warps have according to the DIN 22 109 to be designated by capital letters in brackets, that is, here by the general formula E(Y)P, where according to the DIN 22 109 the following inlay materials are employed as additional warp material Y.

B=cotton D=arylamide Z=rayon staple V = polyvinylacetal R=rayon P=polyamide Thus the nomenclature E(B)P in accordance with the standard would belong to a non-bearing cotton bonding warp.

Besides the function as a bonding warp a non-bearing warp material of that kind frequently also has a protective function against abrasion, piercing and wear and tear (GB-PS 990 730) as well as a function as an indicator during grinding processes (DE-PS 32 29 813).

An additional bearing warp material Y has hitherto been known only as a mixed twisted yarn with polyester, so that according to the DIN 22 102 or respectively DIN 22 109 the nomenclatures A and B for EP belts would have to be applied.

A) Eyp (Proportion of polyester E in the mixed twisted yarn Ey > 50%); B) YeP (Proportion of polyester e in the mixed twisted yarn Ye50%).

So in the case of twisted yarns which consist of different kinds of fibres, that kind of fibre which preponderantly lends the twisted yarn its strength is designated by a capital letter, further kinds of fibres by small letters. Thus to a cotton component in the mixed twisted yarn as a bearing partial system, where the polyester warp preponderantly lends strength to the twisted yarn, would belong the nomenclature EbP in accordance with the standard.

An additional material of that kind in the warp direction can also function as protective system (DE-AS 20 04 986). Another extremely important function of these mixed twisted yarns is now described in detail.

If the conveyor belt is used for underground mining, it must in addition satisfy a filter self rescue test by the central mine rescue station. For in the case of burning of a conveyor belt products of smouldering arise, which may clog the miners' respirator filters. Products of smouldering from the polyester in particular present a problem here, to which in past years particular attention has been devoted. From the DE-GM 80 25 492, DE-PS 30 35 883 and EP 00 48 332 a conveyor belt is known in which the polyester warp threads are twisted with or respectively twisted round by polyamide. The following woven structures may be named by way of example, the polyester-polyamide mixed twisted yarns being underlined for clarification.

a) EpP b) PeP c) Ep(B)b d) Ep(P)P e) Pe(P)P Further mixed twisted yarns, namely, of polyester and polyvinylalcohol or respectively of polyester and polyvinylacetate are described in the DE-OS 31 37 657, these systems of mixed twisted yarns having by no means the importance of Ep or respectively Pe mixed twisted yarns.

Through the admixture of these materials Y the decomposition of the polyester is influenced in such a way that the amount of the smouldering products arising, which are injurious to respirator filters, is reduced. But through this measure the fundamental requirement mentioned initially is frequently no longer satisfactorily fulfilled.

The demands upon EP belts in underground mining, which have now become very complicated, make further development necessary, which is now the problem of the invention. In accordance with the invention this problem is solved through the characterizing features of claim 1.

In the sub-claims 2 to 6 refinements of the conveyor belt according to claim 1 are specified.

The various possibilities of the arrangement of the additional material Y in the warp direction of EP belts are now contrasted nomenclaturewise within the frame of one diagram.

Additional material Y in the warp direction of EP-belts.

non-bearing bearing (I) E(Y)P mixed mixed twited yarn (DIN 22 109) / (11) EyP (III) YeP (DIN 22 102, 22 109) not twisted with E (IV) EYP (Proportion of polyester E in the whole warp EY > 50%) (V) YEP (Proportion of polyester E in the whole warp YE < 50%) Y=B, Z, R, P, D, V (DIN 22 109) Whilst the types of weave (I) to (III) are included nomenclaturewise by standardization, the nomenclature for the new types (IV) and (V) rests upon a proposal by the Applicants, only the type of weave (IV) being interesting within the scope of the invention.In the cases (I), (IV) and (V) the additional material Y in the warp direction may because of its independence also be designated as a system of warp threads.

Conveyor belts of the type of weave (ll/) fulfil within the claimed proportion of polyester the complicated demands mentioned initially. Thus in the case of the type of weave in accordance with the invention the proportion of polyester may be varied within a wider range (51 to 70%) without the strength behaviour and stretch behaviour of the overall lay of the bearing warp threads being disadvantageously altered. In the choice of the proportion of polyester costs and requirements in respect of the smouldering behaviour of polyester have to be weighed against one another.

The following table is now to show by way of example how in the case of the same strength and the same stretch behaviour of the overall lay of the bearing warp threads through an altered structural association of the additional warp material of polyamide the proportion of polyester and thereby also the proportion of the filter-clogging smouldering products of the polyester may be reduced.

Proportions of material in the warp (%)

EpP EPP (P is twisted with E) (P is not twisted with E) E P E P 64 36 54 46 Thus through the altered structural association the proportion of polyester has been reduced by 10%.

Under certain circumstances another non-bearing system of warp threads may be present in the new EP-belts. Examples are: f) EP(B)P g) EP(P)P The structure of the EP-belt in accordance with the invention is now described by way of example with the aid of a diagrammatic drawing.

According to the single Figure the conveyor belt weave consists of the polyamide weft threads 1 to 10 and the polyester warp threads 11. In the warp sequence 1:1 an additional bearing system of warp threads 12 is associated with the polyester warp threads 11, which is not twisted with the polyester warp threads 11. The system of warp threads 12 may consist of polyamide, arylamide, polyvinyl-alcohol, polyvinylacetate, polyvinylacetal, cotton or rayon staple.

Moreover the system of threads 12 may be of the same material or different material.

Claims

1. A conveyor belt of rubber, rubber-like plastics or plastics-like PVC with one or more woven inlays which consist of polyester warp and polyamide weft, an additional bearing warp material being associated with the polyester warp, in which the additional warp material Y (system of warp threads 12) is not twisted with the polyester warp yarn (EY system) and that the proportion E of polyester in the EY system amounts to 51 to 70%.

2. A conveyor belt as claimed in claim 1 in which the proportion of polyester in the EY system amounts to 51 to 65%.

3. A conveyor belt as claimed in claim 1 or claim 2 in which the system of warp threads runs in parallel with the polyester warp.

4. A conveyor belt as claimed in any one of claims 1 to 3 in which the warp sequence of the polyester warp to the system of warp threads reaches from 1:1 to 1:5.

5. A conveyor belt as claimed in any one of claims 1 to 4 in which the system of warp threads consists of polyamide, arylamide, polyvinylalcohol, polyvinylacetate, polyvinylacetal, cotton or rayon staple.

6. A conveyor belt as claimed in any one of claims 1 to 5 in which the system of warp threads consists of the same or different material.

7. A conveyor belt of rubber, rubber-like plastics or plastics-like PVC substantially as described herein with reference to and as shown in the accompanying drawings.