Spectral Output of Light Sources In general terms a light source with a spectral output in the region of nM nanometers is suitable for exposing photostencil materials. Choosing a Light Source Factors in selecting a light source: Pre-Soak Although tempting pre-soaking a small screen prior to washout may cause problems due to the softening effects that soaking can have, especially on thicker stencils that have been under exposed.
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For optimum results use single-layer positives with the emulsion side in contact with the photostencil during exposure.
Expose the photostencil to the Exposure Calculatog in the normal way, washout and dry thoroughly.
Exposure Calculator | MacDermid Autotype
Quick and simple to use. The HPR lamp works by vaporising and ionising mercury which normally takes minutes from switch on. C Metal Halide Lamp Metal Halide lamps are calculaator the industry standard and are recommended by MacDermid Autotype as the most practical light source to use. Timing an exposure is not the most accurate way of ensuring that the stencil has received the correct amount of light. Resolution is checked by assessing the degree of "filling in " at the centre of the target.
How to Guide - Exposing Capillex
Most modern light sources are based on gas discharge, each type having specific advantages epxosure disadvantages. Determining the correct exposure will save time and money in production. Choosing the Right Light Source As a general rule, the minimum distance between the exposure lamp and the vacuum frame should be equal to the diagonal of the area to be exposed. As a rule, Capillex stencils benefit from a 'short, sharp' washout using a strong spray of cold water, predominantly from the print side of the screen.
Spectral Output of Light Sources In general terms a light source with a spectral output in the region of nM nanometers is suitable for exposing photostencil materials.
It may be necessary to use calculafor piece of flexible tubing near or around the positive and connected to the blanket vacuum inlet to insure calculztor air evacuation by channeling the air. Four of the columns are backed with a grey neutral filter of different density.
This invaluable tool takes all the guesswork out of exposure determination to improve quality and productivity. Under Exposure If the exposure is not enough and the whole layer is not penetrated by the UV light, the stencil may wash completely off on washout. They consists of a quartz envelope containing mercury through which a current passes, vaporising the mercury.
The stencil will show variations in colour from one factor to the next. It will be noted that a normal micron 0. If the emulsion feels soft and is easily removed then it is under exposed.
How to Guide - Exposing Capillex | MacDermid Autotype
Expose the stencil using the Exposure Calculator. The stencil would probably be damaged by a strong washout spray. Want to know more about this product?
An additional advantage of the light integrator is that, regardless of lamp position, once an optimum exposure level has been found, no further adjustments are required. It is only when trying to accurately reproduce very fine line halftones or images, that attention must be paid to light geometry.
Determine which factor resolves the finest line you need to print? If there is still a colour change between Factor 0.
See the 'exposure' sections in the 'How to use' guides for detailed advice. Under exposure is the single biggest cause of stencil breakdown on the press. The merging of dots, or thickening of the join between dots, indicates dot gain. Pre-Soak Although tempting pre-soaking a small screen prior to washout may cause problems due to the softening effects that soaking can have, especially on thicker stencils that have been under exposed.
This ensures that light undercutting will be restricted and that the stencil will be uniformly exposed. This concept enables five different exposures to be made simultaneously.