|Textbind single unit||Textbind double unit|
Texbind belts have been originally designed as an universal mining conveyor belting to provide maximum flexibility together with high resistance.
Now, Texbind are available as profitable alternative of multiply conveyor belts in case of heavy applications where impacts with big-sized materials are present.
Texbind is composed of a single ply carcass which provides the mechanical characteristics of the belt, protected by two rubber covers which define the typology of use of the belt.
In case of extreme applications where high tensions in the textile carcass add to heavy and hard working conditions, with big lump materials falling on the belt surface from considerable heights, a special version with two textile layers is available; with this construction the already superior resistance against impacts, typical of the straight warp construction, is multiplied for a factor higher than 2, thanks to the perfect synergy guaranteed by the intermediate rubber layer specifically designed to distribute the impact energy between the two layers.
Rubber covers are tipically wear resistant or selfextinguishing; however, also oil proof and heat resistant realizations are available, on request.
- High impact, tear and cutting resistance thanks to its special double reinforced weft
- Superior longitudinal flexibility that allows smaller pulleys
- Very low permanent elongation guaranteed by straight warp construction
- High efficiency with mechanical jointing
The EpP weaving has been introduced for conveyor belts in order to overcome the limitations of standard EP multiply belts of medium-high style: high elongation, weak weft resistance for heavy applications, high thickness with consequent belt stiffness and possibility of ply separation.
In fact, the straight warp allows to reduce elongation as no weave in the filament is present, the double weft allows to highly improve the fabric resistance against impacts and tears; moreover, the monoply construction makes the belt carcass thinner and deletes any possible ply separation.
|Straight warp polyester yarns|
assuring low elongation, high
tensile strength and superior
|Binder nylon yarns|
connection between warp
and weft filaments
|Double layer of straight weft nylon|
yarns assuring high resistance
against impacts, tears and cuts
together with good troughability
STANDARD PRODUCTION PROGRAM
Max working tension
Max working tension
For different belt styles and cover thickness, please do not hesitate to contact our commercial dept.
MINIMUM RECOMMENDED PULLEYS DIAMETERS mm
|60% ÷ 100%||30% ÷ 60%||≤ 30%|
A: drive and tripper pulleys
B: tail, take-up and low tension pulleys
C: snub pulleys (max angle 30°)
% RMBT: % of Recommended Max Belt Tension
The great advantages that Texbind belts show in the heaviest and strongest applications are much more evident during instrumental laboratory verifications.
Graphics here below refer to destructive tests of cutting and tearing, realized in the SIG SpA technology laboratory according to the international standards.
Both the procedures highlight how the Texbind resistance continuously increases during the test while for standard EP multiply belts the tendency is indented.
This is due to the fact that the weftyarns of Texbind belts, free to move inside the straight warp fabric, go close one to the other multiplying the single resistant strengths, already high themselves; on the contrary, this is not possible for EP belts where weft yarns tend to break singularly just because binded in the woven structure of the fabric.
Tearing resistance test
Cutting resistance test
Texbind single unit can be joined through different procedures; these pages show the method we suggest as best compromise between execution easiness and splice efficiency.
Differently to other methods, the use of materials of hard availability, such as the rubberized textile inserts, is not required as the use of classical calendered products and rubber solution is enough.
The joint resistance, depending on the overlapping length, allows to reach an efficiency over 90 % if our splicing materials are used and if the indications of this procedure are carefully followed.
Furthermore, a high lifetime is guaranteed thanksto the particular fabric interweaving that practically deletes the possibility of joint opening typical of classical overlapping methods.
Aim of this procedure is to show the special fabric interweaving; for this reason, the base method for rubber belt joining is expected to be well known, as described in our “Installation manual”, available for our customers in SIG’s web site. Therefore, we do not refer to the classical activities such as the cut of the correct belt length, the solution application on the surfaces to be matched, the fabric cleaning, the cover rebuilding, the heads alignment, the vulcanization.
1. Eliminate the covers of both the belt heads for a length equal to L+25 mm;
2. Apply a layer of skim rubber 0,5 mm thick on the 4 fabric faces;
3. Mark the cutting lines of width S following the scheme of Fig. 1, making sure that the narrow extremities (A and I) are opposite to the motion; the last couple of strips (A-1-I-8) must be adapted in width according to the belt width;
4. Cut the fabrics along these cutting lines;
5. Place the bottom cover with thickness of approximatly 1 mm less than the original one, with a minimum of 2 mm;
6. Align the two belt extremities at a distance such as to allow a strip overlapping with length L;
7. Following the scheme of Fig. 2 and 3, place the strips on the bottom cover starting from A, alternating the two heads (sequence A–1–B–2–C....7–H–8–I), assuring the alignment and the planarity of the strips themselves; please note that the strip heads must not be positioned at the end of the cut but 10 mm back in order to favour the transversal bending of the fabric;
8. Put suitable quantity of uncured rubber to cover all the differences in thickness at the end of the fabric strips;
9. Place the top cover over the joint taking in mind that the thickness must be approximately 2 mm less than the original;
10. Proceed with the vulcanization.
|Belt style N/mm||400||630||800||1000|
|Overlapping length L mm||450||750||950||1250|
|Strip width S mm||50||70||100||100|
|Length to be prepared L+25 mm||475||775||975||1275|
|Total joint length mm||500||800||1000||1300|
In case efficiency values lower than 90 % are required, it is possible to reduce the overlapping length L up to a suggested maximum of 20 % (i.e., for class 400, L becomes aprox 350 mm). In this case, the splicing efficiency remains anyway over 70 %. On the contrary, we suggest to increase L of 20 % for high temperature applications.
The joint of Texbind double unit can be executed with the typical step methods; as this type of belt is often selected for its solidity and not for the specific guaranteed tensile strength, it is possible to choose 1 or 2 step method according to the desired efficiency: maximum 50% in the first case, up to 90% in the second one.