Vinyl Tarpaulin (Technical Fabric) Part – 2
Raw materials utilization, yarn specifications and properties, weaving production procedures of Vinyl Tarpaulin Fabrics
The high tenacity yarn has high strength, durability and chemical resistance, and withstands an extremely hot environment that can stress conventional multi-filaments to their performance limits.
Part-1 of the article on Vinyl Tarpaulin Fabric properties and application
Polyester filament yarns for Tarpaulin woven fabric
High tenacity (HT) multifilament’s, twisted two ply or high intermingled polyester yarn, denier per filament (dpf). Ideally and in general, DPF should be 5.2 e.g. 1000 denier / 192 Filaments.
High tenacity (HT) multifilament’s, No or low intermingled polyester yarn, denier per filament (dpf). Ideally and in general, DPF should be 5.2 e.g. 1000 denier / 192 Filaments.
For warp and weft yarns
A filament is a single thread-like object. Multifilament implies there is more than one filament. Fil count tells us how many single filaments there are in the cross-section making up the total Denier. An important parameter to consider is denier per filament (dpf). Ideally and in general, DPF should be 5.2 e.g. 1000 denier / 192 Filaments. Lower dpf offer a softer feel at standard twist levels, while higher dpf may offer better resistance to abrasion.
Yarn made from higher dpf will exhibit higher torque compared to similar denier with a lower dpf. Lower dpf offer a softer feel at standard twist levels, while higher dpf may offer better resistance to abrasion. Yarn made from higher dpf will exhibit higher torque compared to similar denier with a lower dpf. This is used where there is required high tenacity. Or where tenacity has prime role.
For example, Banner, Tarpaulin, Roofing, Membrane Structure, Awning, Filler Fabric, Sunshade, Outdoor Furniture, Hose, Sewing Thread, Seat Belt, Sling, Conveyor Belt Fabric, Geotextile, Rope, Tire Cord, Sail Cloth and so on. The high tenacity yarn has high strength, durability and chemical resistance, and withstands an extremely hot environment that can stress conventional multi-filaments to their performance limits. There is very little variation between the various manufacturers of high tenacity polyester in the general physical properties measured. Other factors including availability, service, spin finish, and package wind quality are often the deciding factor in choosing the best choice for a particular processing application.
Multi-Layer Fabrics: the art of weaving several layers in a fabric
Multi-layer fabrics - design, properties, and concepts
The use of filament yarns with a yarn count of 210-750 den and a filament count <5 den (5.5 dtex) is recommended for airbag woven fabrics. The yarns can be untwisted, but a twisted yarn for the warp with a twist of <200 T/m is proposed. In using twisted yarns, the aforementioned disadvantages arise; if an untwisted yarn is employed in the warp, it would be nearly impossible to process it satisfactorily on the loom at a high fabric density without size.
Dyed, Greige—Product Details
Count : Denier:50D, 70D, 100D, 150D, 210D, 250D, 300D, 420D, 500D, 840D
Ply: 2 or 3 plies.
Other Yarn Specifications
- Breaking strength and elongation at break can vary depending on the end use. This is the maximum load that a material can withstand while being stretched or pulled before failing or breaking (also known as tensile strength). Knowing the minimum strength requirement of a finished article is important when deciding what denier to choose as your base material. Very important when failure can lead to liability claims.
- Tenacity is force divided by linear density. The unit of measure is grams/denier. High tenacity is generally preferred over mid tenacity. High strength from finer yarns also offers higher yield with optimum tensile performance.
- Hot air shrinkage is another important consideration of a yarn specification. For example, in hose manufacturing, a yarn is braided around the hose and then put through a vulcanization process and if the yarn does not have correct shrinkage values it can drastically affect the integrity and appearance of the hose after the vulcanization process.
- LOW SHRINK YARN-are used for
- Coating and laminating
- Stator lacing
- Fibre-optic cable binders and ripcords
|High Tenacity (HT)||High Tenacity Low Elongation (HTLE)||Suer High Tenacity (SHT)||Super High Tenacity Low Elongation (SHTLE)|
|Tenacity (gpd)||7.6 – 9.2||8.5 – 9.8||9.3 – 9.8||9.0 – 9.8|
|Shrinkage *||6.0 – 9.0||5.0 – 7.0||6.5 – 10.5||7.5 – 10.5|
|Shrinkage **||13.0 – 15.0||7.0 – 9.0||15.0 – 18.0||13.0 – 18.0|
|Elongation @ Break (%)||12.0 – 16.0||11.0 – 15.0||10.0 – 16.0||< 12.0|
|Mid Shrink (MS)||Low Shrink (LS)||Super Low Shrink (SLS)||High Modulus Low Shrink (HMLS)||High Shrink (HS)|
|Shrinkage *||3.0 – 5.5||0.5 – 2.8||0.0 – 2.3||2.0 – 4.0||7.0 – 12.0|
|Shrinkage **||5.0 – 7.0||3.0 – 6.5||0.5 – 2.5||3.0 – 6.0||14.0 – 16.0|
|Tenacity (gpd)||7.5 – 8.1||7.5 – 8.6||7.7 – 8.6||7.7 – 8.1||>= 8.7|
|Elongation @ Break (%)||12.0 – 22.0||11.5 – 25.0||11.0 – 28.0||10.0 – 14.0||13.0 – 17.0|
Warping Process in Weaving: Objectives, Types, Operation and Problems
The main objective of warping is to prepare a warp sheet of desired planned length containing the desired number of yarns that are wrapped on a flanged barrel in such a manner that tension in each yarn and density of yarn mass in the cylindrical assembly is maintained within a given tolerance level throughout the wrapping of the warp beam. By warping process yarn quality increase, wound up the fixed length of yarn on weaver’s beam. Increase the wearability of yarn. In this process, small packages can be re-use. After all, increase the production. The process of warping is dedicated to the conversion of cones into a beam of given specifications.
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