Heat press pressure mystery solved!

[Anonymous]

According information provided by Insta Graphic Systems Service Technician D. Cedillos, Insta 728 press has piston area 324 sqcm, so actual pressure on 40*50 cm platen will be 2,5 times lower then system pressure set by operator ( 800/324=2,5 where 800=40*50 platen area), It means that to create 1 bar pressure on platen, operator needs to set 2,5 bar system pressure. For example Sefa Rotex Air X press, has piston area only 30,4 sqcm, so to create 1 bar pressure on 40*50 platen operator has to set system pressure 800/30,4=26,5 bar. But that is not possible, because according Sefa Rotex Air X press, specification max pressure system can endure is 10 bar, and corresponding platen pressure could not be bigger then 0,38 bar.

When doing Forever Flock finishing, operator instructed to set 5 bar system pressure on Insta 728, the real pressure on flock in that case will be 2 bar. So, if operator using say Sefa Rotex Air X press, formally following Flock Finishing manual, setting 5 bar, he will have on flock instead of required 2 bar only 0,19 bar. It is 10 times less pressure, which attained on Insta 728 at 0,5 bar system setting, which regarded as extra low pressure. So there is a chance that Flock finishing done at that extra low pressure would not have expected quality,

So if Flock finishing material really needs to be pressed to fabric with 2 bar pressure, then it could be done only with unique machines designed to create extra high pressures like Insta 700 series (if we believe to what Insta technician says), Does anyone know any other mechanical or pneumatic desktop 40×50 presses which can create required 2 bar pressure? Commercial presses I came across, all make pressure not bigger then 0,6 bar.

So when using Forever manuals one has to bear in mind that actually they were written only for Insta 728 press users,

[Anonymous]

In my above post I made mistake when calculating 40*50 plate area. Bellow is data based on corrected calculations.

Insta 728 press has piston area 324 sqcm, so actual pressure on 40*50 cm platen will be 6,17 times lower then system pressure set by operator (2000/324=6,17 where 2000=40*50 platen area), It means that to create 1 bar pressure on platen, operator needs to set 6,17 bar system pressure.

So, what in Forever manuals specified as “medium system pressure 2-3 bar, actually are 0,32 – 0,48 bar platen pressure, “high system pressure” 5 bar corresponds to 0,81 bar platen pressure.

When doing Forever Laser Dark-no cut, Flock finishing, or Classic + Universal transfer
operator is instructed to set 5 bar system pressure. Corresponding pressure on material in that case will be 0,81 bar.

Such big pressure can not be created on common pneumatic 40*50 press like Sefa Rotex Air X (max 0,38 bar), Sefa Rotex Air Pro (max 0,43 bar), or other desk top press I know, except Insta 700 series.

So, what is mentioned in manuals as “high pressure”, can be realized only on exclusive Insta presses, common pneumatic heat press can create only “low-medium pressure” which may be not enough to get proper transfer quality.

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