and the answers for: Self contained exposure units
The self contained range of metal halide exposure units for screen printing are very straightforward machines to use, but like most straightforward products, sometimes it is necessary to provide some background information that will help to clarify initial concerns. Below are some of the most frequently asked questions and we hope that these will help you to decide if either one of these products is the machine for your business.
Click on a question below to reveal the answer:
- What is this system referred to as a self contained exposure unit?
In order to expose high definition artwork onto a screen, two specific pieces of hardware are needed. The first is an exposure source, in this case, a metal halide bulb, and secondly, a vacuum table to pull the light sensitive emulsion which the screen has been coated with tightly against the artwork. When exposure and vacuum systems are integrated into one module, the unit is referred to as a self contained exposure device.
- What type of client would need a self contained exposure unit?
Any client that needs to expose very detailed designs such as process colour separations, but does not use screens that are larger than 127 x 171cm will choose this style of exposure device in preference to a free standing light source and vacuum table. In addition, schools, colleges, universities, research laboratories and any print shop that has space restrictions would benefit from an "all in one" system.
- What kind of artwork should I expose on this unit?
In simple terms, anything, whether it be simple solid areas of spot colours or complex half tone dots as required for process colour printing.
- Why does this exposure device use a metal halide light source?
Once the exposure area becomes a certain size, it is simpler, more cost effective and quicker (in relation to exposure time) to use this type of light source instead of traditional low wattage UV tubes.
- Why does the self contained unit have fluorescent tubes built in the case?
These tubes allow the unit to be used as a light, or touch-up table so artwork can be checked carefully prior to exposure
- How do I set the exposure time?
The exposure time is set in seconds or light units depending on the preferred method of exposure.
- Why are the units offered in different power levels?
This allows the most flexibility for installation of the system when supplying a unit to a customer. In addition, the high power light sources are needed when exposing larger images and some substrates can be cured very quickly if a high output lamp is available.
- What power requirements are needed?
A standard 13 amp domestic plug socket is needed for any of the single phase 240 volt models. All other models require a three phase 400 volt supply which may not be available to residential homes or some small business premises.
- How much space do I need?
The unit is supplied on heavy duty castors hence can be easily moved. In addition, the system is built in a way that allows it to be brought into the building using a standard 90cm doorway with only the minimum of parts having to be assembled afterwards.