Recommended printing technology on textile products

 

Paint for textile printing.

 

Plastisol ink (Plastisol).

 

Printed materials:

• Cotton,

• 50x50 (preferably with a catalyst),

• synthetics (preferably with a catalyst),

• drenching rain repellent (preferably with a catalytic converter).

Products:

• Clothes (50x50),

• t-shirts, T-shirts, sweatshirts, jackets,

• jackets, windbreakers,

• bag.

Features:

• The paint does not dry in the frame (140-180gr need heat treatment).

Pros:

• No dilution solvents or moderators,

• there is no need every time you stop printing remove the paint from the form,

• high permeability through the high number sieve (№120-160),

• possible to print on damp wet.

Cons:

• low resistance to dry cleaning,

• not very pleasant to the touch,

• high gloss, which is not always the desired result.

 

 

Water-based paints.

 

Printed materials:

• Cotton,

• 50x50 (preferably with a catalyst),

• synthetic (catalyst only),

• water-repellent impregnation (only with a catalytic converter).

Products:

• Clothes (50x50),

• t-shirts, T-shirts, sweatshirts, jackets,

• jackets, windbreakers,

• bag.

Features:

• The paint dries in the frame, but for complete drying requires thermal treatment 160-180gr.

• Pros:

• high resistance to dry cleaning,

• rinse with water,

• cleaner (European standard),

• pleasant to the touch (the ability to paint the structure of the material),

• good resistance to boiling,

• drying air,

• you can print on wet raw.

Cons:

• there are certain difficulties in printing since paint dries and can clog the printing plate,

• low permeability through the high number sieve. (max №100),

• higher costs relative to plastisol inks. For the same price for 1 liter. more flow in as printed across the lower numbers sieves,

• increasing the drying time. (During the first drying the water evaporates, then the process of polymerization. Therefore it is better to use IR tunnel dryer with convection for more intensive evaporation of water from the paint. Or add catalyst),

• no high elasticity.

 

 

Solvent-based inks.

 

Printed materials:

• Nylon, nylon, polyester.

Products:

• Clothes (50x50),

• coats,

• bag.

Features:

• Paint dries in air, and does not require heat treatment.

Pros:

• High adhesion to synthetics,

• air drying without the heat treatment,

• high elasticity.

Cons:

• Dries in a grid,

• require dilution moderators or solvents,

• has a strong smell,

• you can not print on the raw crude.

 

 

Features printing on textiles.

 

The product is only printed in a single setup on the print table. This is due to the fact that the fabric stretches and can not hold its geometric shape, unlike paper, plastic, metal, etc., because of its precision re-installation on the printed board is not possible. In order that the product has not moved during the printing process, it is glued to the table printed on a special adhesive. While the product is glued to it is necessary to put all the colors. After his removal from the glue that has to do will be impossible.

 

 

Fabrics are absorbency substrates. This means that during the printing ink penetrates into the fabric structure. Because of this, the volume of ink will be greater than when printing is not absorbed at the substrate (paper, self-adhesive, plastics, metal, glass, etc.).

 

Printing on hand vertical lathes.

 

Print setup:

• Checking the table - all tables must be in the same plane. This means if you configure one printed frame with zero clearance, on all the tables, this frame is lowered should have zero clearance.

• Check the clips - clips stencils must be set parallel to the table.

• Check the clips - the clips must be in commercials without gaps (in the fixed state rollers should not be scrolled).

 

 

True image of the cross:

• Control of plates - with multi-color printing to obtain a good alignment should be the same size stencils and tension screens. Sieve should be one number apart from the substrate and print special colors (gold, silver, vzduvashka, glue).

• The sequence of colors - plates are installed in the machine according to the following rules.

1. The substrate is always printed first.

2. The first color after the substrate is selected on the basis of the minimum area of the image.

3. The coating of paint - the colors are put on lighter to darker. At the end usually put the most opaque colors (black, white, gold, silver).

4. Transparent colors - the colors are put on the principle that the color that should be the brightest, becoming closer to the end or before the intermediate drying. Black color can stand immediately after the substrate.

• Setting the Standard - fix a positive picture on the table in a place where there should be an image on a product (according to model).

 

 

• Gap-0 - for convenience and accuracy settings gap between the frame and the table should be removed.

• Check mikroprivodok - micrometric register is to be in the middle position.

• Rough-true - to adjust the printing plate on the layout crosses against the light and lock in the clamps of the machine.

• Accurate register - Unlock mikroprivodki and make fine adjustments to the standard form of the crosses, then lock back.

 

 

Working position print podsushka, stretch, eat. Their location depends on the performance, cost and print quality. Usually printed tables rotation is clockwise, on the basis of this, we consider the working position. P - printer, IR - period (IR intermediate drying), H - tensioning products, C - removal products.

• 1-P, 2 IR. scheme is applied with a small circulation with lots of flowers (3-6tsv). In this case, the period immediately following the printer, in order to increase the cooling time of the ink after drying.

• 1-H, P-2, 3-IR. Scheme is applied in the case of the average circulation and a small number of colors (2-3tsv) and experienced printers. In this scheme, the printer will be idle less, but lower quality control.

• R 1, IR 2, 3-H. Scheme is applied in the case of the average circulation and a small number of colors (2-3tsv) and inexperienced printmaker. In this scheme, the printer is idle longer, but higher quality control because one who pulls the product and controls not immediately after drying.

• 1 H-2-P, IR 3-, 4-C. scheme is applied in the case of large circulation and small number of colors (1-2tsv). In this scheme, high efficiency, good quality control and high costs. With more colors printing position tightening and removal of products begins to idle.

 

Drying prints on textiles.

 

Intermediate drying.

 

Intermediate drying. The task of intermediate drying reduced to the fastest drying paint to a state in which it is not lubricated during the subsequent imposition of colors. This gives a more intense imprint with sharp edges. Intermediate drying can not replace the final drying paint because has a very short time, which is not enough for its complete polymerization. There are various designs of intermediate dryers, which can be divided into two types. Continuous dryers (they produce heat, not permanently turned off during printing) and pulse setting (heating only occurs during the approach to the position of the drying table).

 

 

The main parameters affecting the intermediate drying:

The distance between the gap and the printing table influences the density and uniformity of the product on heat flux. The larger the gap, the less the concentration of but more uniformity. The minimum gap between the intermediate product and drying should not be less than 20 mm. it provides a guaranteed trouble-free entry table.

The drying time. Drying time is determined experimentally and is exposed on the timer period. On the drying time is influenced by many factors such as:

• Distance from gaps to the table. The greater the distance, the more drying time.

• The heat capacity of the product. The higher heat capacity (the ability to absorb the product and keep warm) the more time you need to spend on heating products. Time for drying shirts need less than a hoodie.

• The temperature of the drying paint. Different colors different temperatures start of the polymerization. There are low-temperature paint for their heating needs less and high-temperature paint which requires a higher temperature. Usually standard plastisol, paint temperature immediately after the table should not be below 90 g. (Measured pyrometer).

• The temperature of the table. The higher temperature section, the smaller the drying time. Heated table transfers heat printed product and intermediate drying takes less time to heat. The temperature of the table should be 20-25 degrees lower than the temperature drying. If drying temperature is 90 c., The table should be 65-70 gr. (measured pyrometer). The lower the temperature of the table, the greater the drying time.

 

The finish drying.

 

Final (finish) drying. The task of the final drying is complete polymerization of paint, which provides high performance. To do this, a layer of paint must be heated to a temperature recommended by the manufacturer, and kept at it a given time. Typically, this is achieved tunnel dryers.

 

 

The main parameters affecting the final drying:

• The speed of the conveyor, changing the speed of the tape we get different times that the product is in the heating zone.

• The heat capacity of the product (The thicker the material the product is, the more it takes time to dry).

• The thickness of the paint layer. (The thicker the layer, the longer the paint dries).

• Paint color. (The darker the color, the faster it dries).

• Drying temperature is selected based on technical characteristics and material properties of the paint. The choice of temperature is empirically measured product temperature and the paint layer at the exit of the tunnel and it selects the optimum value, depending on the image quality and the product after passing through the tunnel. For different types of articles its temperature is set at a constant rate of passage and the same areas included.

The device tunnel dryer:

Conveyor has teflon mesh tape that can withstand temperatures up to 300 degrees.

Tunnel is a box with insulated walls inside which the heating elements.

Heating zone. Zones provide the ability to configure a tunnel for drying certain types of products with different properties, while providing optimal power consumption.

When you configure the tunnel should be considered inertia heating elements, ie, take into account the cooling time of the heating elements, after turning off the heating zone and time after switching on.

You should also consider the impact of drafts on the temperature in the tunnel. At sufficiently strong open throttle exhaust fan and curtains may lose temperature in the tunnel, and vice versa, with enough open throttle exhaust, the formation of smoke and smell of paint components.

 

Preparation of printing inks.

 

• Get ready for printing ink.

• Add the required additional components.

• Fill color in their printed form.

 

 

Preparing tables.

 

• Cleaning tables - tables cleaned of old glue, thread and dirt.

• Check the table - tables should not have bumps, dents, rock faces, etc.

• Applying the adhesive - glue applied uniformly thin layer.

• Warm-up tables - tables under heat intermediate drying (Time 1-1.5min.) To a temperature of 70-80 degrees Celsius (Check pyrometer).

 

 

 

Start printing.

 

• Printed gap – set the same print clearances on all the tables on the basis of how much less how much you need. The magnitude of the gap should be sufficient to ensure that after the passage of the squeegee grid moved away from the paint. The more viscous the paint, the more the gap. If the gaps in color will be very different, it may not be a combination of crosses and vytarchivanie white substrate.

• Proof print – for proofing, the product is not taken from the circulation, and the marriage of close texture. Print Test performed to control privodok, uniform fills, edge sharpness and color reproduction.

• Sealing crosses - after receipt of the required quality and the necessary proof print debugging process are stuck marks and other technical information (Pantone color, shape sequence, etc.).

 

Start printing - must be considered:

• Warming up paint - paint in the early printing thick and cold and to heat it up requires time (10-30 prints).

• Time intervals - in the printing process is necessary to reduce the time for intermediate drying to a value at which the tables are not cool and not overheat.

• Temperature intervals after the ink layer should not be less than 90 degrees.

• Superheat control – with a long time span tables can overheat. Superheated table (temperature of more than 100 c.) Paint to become more sticky and adheres to the frame and superheated melt adhesive and no longer hold the product at the table. As a result, the frame can pull the product from the table that leads to marriage.

 

 

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