| 摘要 |
<p>For the provision of high gloss on printed carton surfaces it is known to apply a calendering operation between the printing machine and the punching machine (28), in which the treated large carton sheets (4) are punched for the forming of single blanks for carton packings, the sheets being supplied in piles to respective feeding units of the calender and the punching machine. According to the invention a thermoplastic lacquer is used, applied in a last stage in the printing machine, and the sheets or at least the lacquer layers are preheated at the infeed to the calender cylinder (10). The sheets are held in surface touch with the cylinder over a part of the circumference thereof, whereby an efficient calendering is enabled without any particular heating of the cylinder. Thereby it is possible to use a direct operative coupling together of the calender and punching units, inasfar as the sheets may be successively transferred to the latter unit, optionally in passing a cooling zone (30). Thus, the relatively expensive feeding unit (2) of the punching machine can be avoided.</p> |
