DMS FR Series, Руководство пользователя

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Appendix B: Hot Stamping Tips & Tricks…continued
C. About Temperature Control
Rotary foil printing is a fairly demanding application for temperature control. Most temperature control applications are
much more “stable” in that they don’t have as many system variables. Die size, web speed, substrate used, and impression
size all affect how quickly heat is dissipated from the die surface.
In the DMS Foil Printing System an infrared thermocouple is used to sense the die temperature. It is important to note that
the thermocouple sensor must be located directly over the black stripe on the surface of the hot stamp die.
If you notice a rapid change in the indicated temperature while running a job, immediately check the thermocouple sensor for
proper position, insulation from ambient air, etc., as it is impossible for the die itself to change temperature very quickly.
D. About Handling Foil
It is most common to use the existing laminating unwind and waste rewind for controlling the foil web. Naturally, you will
want to match the length of the foil rolls to the substrate rolls whenever practical, to help cut down on press down time and
make the job run as economically as possible. Your own requirements will determine which set-up is best for you.
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Foil build-up (from burning the foil) is hard material. If left on the surface of the die during a run, this build-up can dent
the surface of the die, causing permanent damage. Build-up can be removed by using the supplied cleaning brush, wood,
or lead to scrape the surface of the die. Return the die to DMS if there is any fear of damaging the die.
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Foil tension should be kept fairly light, compared with web tension. Foil tension affects release action. Excessive foil
tension will adversely affect release action of the foil, while too little tension will cause wrinkling.
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If you’re having problems with foil release, try stripping the foil a little closer or farther away from the die. Some
substrates require as much as 8-10” of cooling area before stripping the foil.
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Foil strips better (cleaner) when a small diameter roller strips it. Knife-edges are also sometimes used.
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Depending on the size of the roll, side plates may be desirable on the foil to prevent telescoping while unwinding and to
provide better tension control.
E. About Handling Dies
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Always use the wooden “V” blocks to temporarily store or assemble dies.
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Use the shipping crate to store dies and prevent damage.
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Never use abrasive cleaners on dies.
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If die becomes tight on shaft, warm the die to 150-200 ° F, then try disassembling. Have the die resized ASAP.
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If the die is brushed periodically during a job (every 15-20 min.), print quality and consistency will be improved.
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Remember to keep the black stripe on the die clean.
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Insulated welding gloves are great if you plan to handle hot dies regularly.