Label sheet for electrophotography and image forming method with use thereof
AssigneeFuji Xerox Co., Ltd.
InventorsTakashi Ogino, Kiyoshi Hosoi
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Abstract
A label sheet for electrophotography, constituted of a label base member and a separator base member both made of resin film, and an image forming method with use thereof. Difference of thermal shrinkage rates in an MD direction between the label body and the separator of the label sheet after heat treatment for 5 minutes at 150° C. is in the range of −0.3% to 0.1%. Stiffness E·t3, a function of a tensile elasticity rate E (N/mm2) of the separator at 135° C. and thickness t (mm) of the separator at 23° C, 50% R.H., is 0.21 N·mm or more. Occurrences of winding around a fuser and marks of winding are suppressed, curls are small, and toner cracks do not appear even if printed matter is left in conditions of high temperature and high humidity.
Claims18
A label sheet for electrophotography, the label sheet comprising:
- a label body including a label base member and an adhesive layer disposed on one surface of the label base member, the label base member including a resin film;
- and
- a separator including at least a separator base member, the separator base member including a resin film, the separator being releasably bonded to the adhesive layer, and the separator including a stiffness B, as determined by the following formula (2), of at least 0.21 N·mm:
- B=E·t3 Formula (2)
- in which E represents tensile elasticity in N/mm2 of the separator at 135° C., and t represents thickness in mm of the separator at 23° C., 50% relative humidity,
- wherein the separator further includes a thermal shrinkage rate in an MD direction thereof, when subjected to heat treatment at 150° C. for 5 minutes, of S % and the label body further includes a thermal shrinkage rate in an MD direction thereof, when subjected to heat treatment at 150° C. for 5 minutes, of L %, such that a thermal shrinkage difference A as determined by the following formula (1):
- A=S−L Formula (1)
- is in the range −0.3% to 0.1%.
A method for forming an image, the method comprising the steps of:
- providing a label sheet for electrophotography, the label sheet including a label body which includes a label base member and an adhesive layer disposed on one surface of the label base member, and a separator which includes at least a separator base member, the label base member including a resin film, the separator base member including a resin film, the separator being releasably bonded to the adhesive layer, and the separator including a stiffness B, as determined by the following formula (2), of at least 0.21 N·mm:
- B=E·t3 Formula (2)
- in which E represents tensile elasticity in N/mm2 of the separator at 135° C., and t represents thickness in mm of the separator at 23° C., 50% relative humidity;
- forming a toner image with toner on the label body of the label sheet;
- and
- fixing the toner image to the label body of the label sheet, including melting the toner by heat,
- wherein the separator has a thermal shrinkage rate in an MD direction thereof, when subjected to heat treatment at 150° C. for 5 minutes, of S % and the label body has a thermal shrinkage rate in an MD direction thereof, when subjected to heat treatment at 150° C. for 5 minutes, of L %, such that a thermal shrinkage difference A as determined by the following formula (1):
- A=S−L Formula (1)
- is in the range −0.3% to 0.1%.
Dependencies are inferred from the claim text.