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    6.
    发明专利
    未知

    公开(公告)号：DE3712070A1

    公开(公告)日：1988-10-20

    申请号：DE3712070

    申请日：1987-04-09

    Applicant: BASF AG

    Inventor： SCHABINGER WILLI ,  KESSLER KLAUS ,  WERTHER HEINZ-ULRICH DR ,  PIEPER HARTWIG

    IPC: G03F7/00 ,  B41D5/00 ,  B41F27/06 ,  B41F27/12 ,  B41N6/02 ,  B41N3/00

    Abstract: A method of joining the edges of flexographic printing plates on printing cylinders, which includes the following steps: (i) fixing the printing plates to make-ready cylinders by means of a first double-sided self-adhesive film having the same area as the printing plate, (ii) cutting the printing plates to size so that they fit the printing cylinders, (iii) removing the cut printing plates from the make-ready cylinders and from the first self-adhesive films, (iv) fixing the cut printing plates by means of a second double-sided self-adhesive film, which has the same area as the printing plates and from 1.6 to 2.6 times the thickness of the first self-adhesive films, so that defined gaps result between the edges of the fixed printing plates, (v) filling the gaps between the edges to be joined, with a liquid photopolymerizable mixture of binders, photopolymerizable monomers and photopolymer, ization initiators and (vi) partially polymerizing the mixture under a transparent film cover by exposure to UV light until the elongation at break in the composite consisting of the solid gap closing compound and the printing plate material fulfils the condition RS

    9.
    发明专利
    未知

    公开(公告)号：DE3783201D1

    公开(公告)日：1993-02-04

    申请号：DE3783201

    申请日：1987-10-20

    Applicant: BASF AG

    Inventor： PIEPER HARTWIG ,  MICHELS REINER ,  WERTHER HEINZ-ULRICH DR

    IPC: B41N6/02

    Abstract: A process is claimed for fixing a flexographic printing plate to a printing roll, where the plate comprises (a) a base layer of elastomeric material, (b) an intermediate layer which is insoluble in and impermeable to developer and printing ink solvents, and (c) a relief layer formed by photo-crosslinking a mixt of 50-99 wt.% of an elastomer and 1-50 wt.% of one or more photopolymerisable olefinically unsatd. monomers. The process comprises coating the bottom of the base layer with a layer of adhesive which is transparent to actinic radiation and has an adhesive force of 1-6 N/25mm when fixed to the printing roll.

    10.
    发明专利
    未知

    公开(公告)号：DE3863955D1

    公开(公告)日：1991-09-05

    申请号：DE3863955

    申请日：1988-03-31

    Applicant: BASF AG

    Inventor： WERTHER HEINZ-ULRICH DR ,  PIEPER HARTWIG ,  SCHABINGER WILLI ,  KESSLER KLAUS

    IPC: G03F7/00 ,  B41D5/00 ,  B41F27/06 ,  B41F27/12 ,  B41N6/02

    Abstract: In bonding the cut edges of photopolymerisable flexoprinting plates which have relief layers and dimensionally stable support films, onto a printing cylinder, by (a) filling the nip between the edges with a photo-polymerisable mixt. of binder, compatible photopolymerisable monomers and initiators for the photopolymerisation, and (b) polymerising the mixt. under a fixed, transparent coating, by irradiation with UV light, the novelty is that (a1) before stage (a) the plates are fixed by a double-sided adhesive film (1) of the same surface as the plates, onto adjusting cylinders and are cut to suit the printing cylinder, after which they are removed from the adjusting cylinder and the film (1), and are fixed onto the printing cylinders by a double-sided adhesive film (2) of the same surface as the printing plates and thickness 1.6-2.6 x that of film (1), and (b1) in stage (b) the mixt. is only partially polymerised until the relation: Rs is less than R(s/f) which is less than Rf is satisfied. R8 = Elongation at break of the partially polymerised compsn. filling the nip; R(s/f) = elongation at break in the interface between the compsn. filling the nip and the material of the printing plate: Rf = elongation at break of the material of the printing plate.

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