Nip Impressions
WHAT IS A NIP IMPRESSION?
A nip is the pressure between two rollers that are forced together. A nip impression is a measure of the uniformity of that pressure. The pressure profile is sometimes referred to as a footprint. It can be measured in many ways. The simplest is to make sure that there is pressure everywhere across the width. A good approach is to measure the width of the footprint. If the width is uneven, the pressure profile must also be uneven. However, measuring nip widths accurately can be difficult if the width is narrow. Also, as we will see, nip width variations are not a very sensitive measure of nip uniformity. The very best measure of the nip is to measure the pressure profile directly. Both nip widths and nip pressures can be measured with paper thin products often referred to as nip impression paper, even though some are these products are made of plastic rather than paper. Nip impression paper behaves like carbon or carbonless paper which turns color when a sufficient pressure has been applied such as by typing or writing with a pen. Nip impression paper is an indispensable tool for machine PM or process troubleshooting. Fujifilm Prescale is a perfect tool for measuring nip impressions.
 » The Fuji Prescale Film Products :
Simply place Fuji Prescale film between any two surfaces which come into contact. Varying colors of red patches will instantly appear on the Prescale which reveal the pressure distribution between the surfaces. Furthermore, the intensity of the red colors of the Prescale film is related to the amount of pressure applied to it.
NEW! We can now slit the Prescale film into thirds. Each slit will be approximately 3.5" wide. This is perfect for nip width applications and gives users three times the amount of film, further reducing costs. This service is offered at no additional cost. Please specify when ordering. » Structure :
• Two-sheet Prescale Film: Prescale Film is composed of an A-Film, which is coated with a micro-encapsulated color-forming material, and a C-Film, which is coated with a color-developing material. The A-Film and C-Film must be positioned with the coated sides facing each other.
• Mono-sheet Prescale Film: The color-developing material is coated on a polyester base, with the micro-encapsulated color-forming material layered on top.
» Ranges:
• EXTREME LOW (4LW) :- 7.2 ~ 28 PSI (0.5 ~ 2 kg/cm2) 10’ x 10.6” (3m x 270mm)
• ULTRA SUPER LOW (LLLW) :- 28 ~ 85 PSI (2 ~ 6 kg/cm2) 16’ x 10.6” (5m x 270mm)
• SUPER LOW (LLW) :- 71 ~ 355 PSI (5~25 kg/cm2) 19’ x 10.6” (6m x 270mm)
• LOW (LW) :- 355 ~ 1,420 PSI (25~100 kg/cm2) 39’ x 10.6” (12m x 270mm)
• MEDIUM (MS) :- 1,420 ~ 7,110 PSI (100~500 kg/cm2) 39’ x 10.6” (12m x 270mm)
• HIGH (HS) :- 7,110 ~ 18,500 PSI (500~1,300 kg/cm2) 39’ x 10.6” (12m x 270mm)
• SUPER HIGH (HHS) :- 18,500 ~ 43,200 PSI (1,300~3,000 kg/cm2) 39’ x 10.6” (12m x 270mm) NOTE: Fujifilm Prescale film is synonymous with pressure sensitive paper, tactile pressure indicating sensor film, pressure sensitive film, Fuji pressure film, Fuji paper, Fuji prescale film, pre scale film, pressure sensitive tape, nip impression tape, nip paper.
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