Splicing tape, splicing method and splice using the splicing tap

Details Splicing tape, splicing method and splice using the splicing tap Splicing tape, splicing method and splice using the splicing tap

1996-10-25

1999-12-07

Walsh, Donald P.

Winding, tensioning, or guiding

Unwinding

With attachment to preceding material

156504, B65H 1918

Patent

active

05996927&

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to permanent or flying splices between sheet materials of the butt, overlap and in particular staggered overlap kind, a splicing tape for use in producing such splices and methods of using the splicing tape in producing butt, and overlap, particularly staggered overlap splices.
In this application and merely for clarity purposes, the leading end and edge of sheet material on a roll is considered to be the last quadrant of sheet material exposed on the outside of the roll, i.e. the section 32 of sheet material shown in FIG. 3B from the imaginary line A--A' to the edge 35. The underlying winding of such a roll is then the piece of sheet material on which the leading edge 35 rests, from A--A' through 360.degree. to A--A' again.
Two common types of splice are known for webs of sheet materials. Firstly, there is a permanent splice for joining the leading edge of one roll or part roll to the trailing edge of a further roll or part roll. The permanent splice should provide a flexible strong connection between the two webs and should maintain substantially all of the properties of the sheet material, for example if the sheet material is paper which can be printed or coated, the permanent splice is preferably, thin, flexible, printable, coatable and should also have the same repulpable properties as paper. Conventional splicing tapes and splices do not generally meet all of these requirements. Further, when joining part rolls the second roll is normally wound back onto the first roll in order to produce a complete roll and the permanent splice is then located somewhere in the middle of the new larger roll. This splice is subject to high pressures caused by the winding tension and it is important that no adhesive materials are present either on or near the splice or bleed out of the splice during storage which could adhere layers of sheet material together or damage or obstruct printing machinery.
A typical permanent butt splice is shown in FIG. 1A. Such a splice can be manufactured using a splicing tape as shown in FIG. 13 and described in WO 90/08032.
A permanent overlap splice is also known as is shown in FIG. 1B and is known in a modified form from WO 93/12025. Here the leading and trailing edges 3 and 4 of the first and second rolls are joined together by a double sided tape of the kind shown in FIG. 14. With reference to FIG. 3B the last sheet layer 32 of the roll 30 is secured by small adhesive tabs 33 applied on both sides of the roll 30. One of the release foils 10 (or 11) is then removed from the double sided tape 24 to expose the pressure sensitive adhesive 2A (or 2B) and the tape is applied across the width of the last sheet layer 32 of the roll. The excess of the leading edge is folded back against the double sided tape and is creased and torn off so that the final leading edge 35 abuts the double sided adhesive tape 24 as shown in FIG. 3B. In this condition the roll may be stored until a splice must be made. In order to complete the splice the remaining release foil 11 (or 10) is removed thus exposing the pressure sensitive adhesive 2B (or 2A) and the trailing edge of the second roll is then applied to the exposed pressure sensitive adhesive. The excess of the trailing edge is folded back to the adhesive join and is creased and torn off in the same way as described above with respect to the leading edge of the first roll. The splice now appears as in FIG. 1B.
This type of splice has a disadvantage that there is a considerable step at the change from the sheet material 3 or 4 and the splice itself when compared with the butt splice shown in FIG. 1A. This step can disrupt the printing process. Further, there is the possibility of the adhesive bleeding out of the splice or bleeding through the paper if placed under pressure. Additionally, the webs of sheet material may move relative to each other when tension in the web puts the splice in shear. If movement occurs during multiple pass printing the alignment in successive printing stages is disturb

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