Further processing steps give the material its final characteristics. The final features are achieved through a variety of ennobling steps. The most important of these steps for digital printers are the following :
- surface handling: shiny/matt appearance
- flame resistant treatment
- coating to optimise the printing characters
- improvement of run feature in the printer
- airtight coating for vacuum tables
The following should be considered when processing printed textiles :
Cutting : Cotton textiles can be cut very well with commercial textile scissors. Can be torn very easily after an initial cut. Synthetic textiles (out of polyester or polyamide), e.g. Trevira® CS – can be best cut with a hot cutting machine. The edges melt neatly without loose threads. These materials cannot be, or are very difficult to tear. Textile glass should only be cut by specially equipped companies as splintering of small glass particles occurs which can cause skin irritation.
Sewing/hemming : The quality of the yarn should match the quality of the textile to be processed :
cotton textile = cotton yarn
synthetic textile, like Trevira, polyester, polyamide = polyester yarn
silk = silk or cotton yarn
cotton/viscose = cotton yarn
textile glass = polyester yarn/glass yarn
If a cotton textile is sewn with a polyester yarn and the finished product is washed, the cotton material will shrink by approximately 3% while the polyester yarn will not shrink at all. This will result in crinkling at the seams. Furthermore, the strength of the yarn should correspond to the thickness of the material and the area of application. For outdoor use, such as a flag, “Gore” yarn should be used. This yarn is very sturdy and also heat-resistant.
The folding properties of the material should not be ignored when sewing. Thick coated textiles, such as canvas, should not be hemmed as the coating will tear. Furthermore, the thick, coated material has relative sturdy edges.
Interlining fleece : This is a self-adhesive fleece material which is ironed onto the hem to strengthen the edges. A white fleece is recommended for light prints and a black fleece for dark prints. Larger surfaces should be seamed which is quicker and more economical than interlining.
Eyeletts + webbing : A webbing needs to be sewn into the hem before punching holes for eyelets. This is necessary to avoid ripping out the eyelet. The webbing material has to match the textile material, i.e. cotton material = cotton webbing, polyester textile = polyester webbing, thick textile = strong webbing etc… Most webbing material has a width of 4cm. Please note : eyelets should always be placed in the middle of the webbing.
Ironing : When ironing, textiles should be treated the same as clothes, i.e. higher temperatures for cotton (2 to 3 points) and lower temperatures (1 point) for polyester. To reduce the chance of polyester material melting, we recommend that you lay a cloth over the material before ironing. Some creases can be removed from cotton with steam alone. If the creases are not to pronounced then they can be steamed and then left to dry. Canvas and other synthetic coated material, such as Solvotex, may not be ironed due to their coating.
Washing/Cleaning : Flame-retardant textiles lose their flame-retardant properties when washed or cleaned thus voiding their guarantee. Cotton materials may also shrink when washed. All textiles may washed only with water (without chemicals).
- Trevira® CS textiles retain their flame-retardance after washing.
- Canvas can not be washed due to its coating
- Solvotex all Products can be washed chemical- free at 30 °C, when the colors are bonded with the textile (scratch resistance). Polyester and Trevira® CS products can be shrink a little bit. Cotton shrink more than them. If you wash Polyester and Cotton products the flame resistance could be lost, colors can bleach and cotton can lose its from.
- Printex all Printex products are non-washable
- DYEtex all DYEtex products are washable and suitable for outdoor use, but loose their flame-retardent characteristics
- Rolls should always be stored lying flat to avoid damage to the ends. The complete length of the roll should have floor contact. This prevents pressure marks and hanging of the product. Textiles must be packed and stored in a dry, climate-controlled environment to prevent the absorption of moisture.
- All textiles should stored packed in climate-controlled and dry rooms, to avoid moisture absorbtion from the ambient air. The ideal room temperature is between 18 and 22°C, the ideal air humidity between 30 – 60%.
- In case the material is stored or processed outside the prescribed temperature and humidity conditions it is necessary to remove the film packaging and let the material acclimatize for 8-24 hours before processing.
- In case the material is exposed for a prolonged period ( about 2 weeks or more) to low humidity and temperatures below 10°C, we recommend to acclimatize the unpacked material for 48-72 hrs before processing.
- Final convert prints should stored and shipped rolled if possible, to avoid breaks and cracking. They should stored packed in climate-controlled, dry rooms also.
Neschen AG Offers :
Coatings : Water-based dispersion adhesives (permanent and reversible), clear, pigmented, functional coatings made from aqueous solutions (e.g. also heat-activated). Also, contract work for complete surface applications or for specific zones as defined by the customer e.g. circles or other geometric shapes, lettering or logos.
- Application weights : from under 5 g/m² to over 80 g/m² Materials: PE, PP, PU, PVC, paper, PET, textiles, fleece fabric.
- Thickness : 10 – 500 µm Widths : up to 2000 mm.
- Manufacture : narrow reels and short reels, delivery of master reels on 3” and 6” cores.
- Covering : single-colour print backing paper, release behaviour geared to the adhesive system.
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