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The SELECTASINE Screen Printing System from George Weil Selecatsine binders are well established and highly proven for screen printing. They are manufactured by Brenntag UK Ltd and backed by their research and technology. The printing system is simple, economic and flexible in use. When combined with the Selectasine pigments, it produces a soft finish and has outstanding fastness. Although designed for screen printing, it can also be brushed, sprayed and blocked. There is the acylic-based, standard binder for general printing onto light fabrics and 5 special effect binders, each fulfilling a specific function. These binders can be intermixed to create variations on the results. The binders are combined with concentrated colours to create the screen printing ink. Method for Mixing the Ink 1. Estimate the amount of binder you require. 1kg of Selectasine binder SF20 will cover approximately 2.8m/30 sq.ft. of print area, but some fabrics are more absorbent than others. 2. Stir or shake your chosen pigment well before measuring the desired quantity. The colours are highly concentrated and should be used at a rate of up to 50g per kg of binder. In practice, an average of 35g will give full shade (Lumi- nous colours should be used at a rate of 80-120 gm per kg and Metallic Powders at a rate of 100-150 gm per kg). NOTE: When Selectasine Black TT Pigment is combined with Selectasine binder SF20, the solution is prone to gelling if the concentration of the pigment is more than 2% (2g per 100g binder). In order to get a good strong black, a 5% concentration is generally required. To prevent gelling, add a salt solution (10g salt to 100ml water) a little at a time, depending on the concentration of black required. 3. Carefully add the colour to give the strength of colour required. Do not overload the Binder with colour as surplus will be left on the surface of the material and come out and discolour the water in the first washing. 4. When the prints are dry, the pattern will need fixing by the application of heat. Heat speeds up and completes a chemical “cross-linking” reaction. Generally, fixing can be completed with an iron at 150°C for 4-5 minutes on the reverse of the print. In some cases, the temperature can be increased, thus proportionally reducing the time, but consid- eration must be given to the nature of the fabric and the amount of pigment used. A thorough ironing, on the reverse of the print, may achieve reasonably fixing. 5. SCREENS SHOULD BE THOROUGHLY CLEANED AFTER USE. Clean out all the ink debris using a nail brush with a little washing up liquid and plenty of water. If screens are stored with Binder still left in the mesh, they will become permanently blocked. 6. Most fabrics are readily printable, but some may have received special treatment which makes them unsuitable. It is recommended that a sample is printed and tested for fastness before the whole batch is printed. Check whether the fabric is ‘Prepared for Dyeing’ (PFD) or requires scouring to remove any grease, oil or starch. Run a few droplets of cold water onto the fabric. If they soak in quickly, no scour is necessary. To remove starches, size and oils, add 5mls of Synthrapol (a non-ionic detergent) along with 2-3 litres of water for each 100g of material. Stir gently over a 15 minute period, and then rinse thoroughly in warm water. It is possible to use household detergent, but the alkaline residue may affect the final colour or wash fastness. Please see over the page for the Bricoprint statement regarding SOLVENT-BASED BINDER TS125 George Weil & Sons is a limited company registered in England & Wales, reg no: 00321890 Registered office: Old Portsmouth Road, Peasmarsh, Guildford, GU3 1LZ Tel: 01483 565800 • Fax: 01483 565807 Email: [email protected] • Web: www.georgeweil.com
