Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1992-10-06
1994-11-01
Osele, Mark
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156285, 156504, B65H 2100
Patent
active
053605020
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method and apparatus for splicing at least two single or multiple layer materials comprising air permeable soft paper webs.
2. Description of the Prior Art
An usual method of splicing web material has so far been to stop the material web which is to be spliced and thereafter to manually tape the old material web to a new material web. For providing a more secure splice between two multiple layer materials it is usual to tape both sides of the departing material web so that the upper and lower layers of the respective material web are joined together. A natural result of this splicing method is that the web tension, which is important for carrying out the process, is lost. Starting up again after splicing and retrieving the web tension results in undesired material waste. Another method used for simple material webs has been to use vacuum for providing a temporary positional fixation of the new material web in relation to the old one which is to be spliced, the speed of the web which is to be spliced being lowered at a predetermined splicing instant sufficiently for the new material web to be fixed against the old one with the aid of rapidly setting glue or a tape arrangement when the webs come together and the vacuum is released. This method has been found unsuitable for thin multiple layer soft paper material due to only one of the layers in the respective material web being joined to each other.
SUMMARY OF THE INVENTION
One object of the present invention is to achieve a method and apparatus for splicing soft paper webs in particular, the above mentioned drawbacks having been completely eliminated while the material waste at the splice location is very small.
This and other objects of the present invention are achieved by a method of splicing at least two single or multiple layer materials comprising air permeable soft paper webs while maintaining unaltered web tension during the splicing operation. The method is characterized in that splicing of a new web to a moving web is carried out by positionally fixing the forward end portion of the new web with the aid of vacuum in a manner known per se against a first suction chamber. The end portion is thereby retained in a position with an outmost part of the end portion of the new web trailing against the moving web at a second suction chamber over which the moving web passes. A suction force in the form of a controlled air flow through both material webs being generatable with the aid of this second suction chamber, and for a predetermined time the suction force in the second suction chamber is actuated for full entraining effect simultaneously as the first suction force in the first suction chamber is released, the departing web taking with it the new web, by reason of the vacuum in the second suction chamber, into an embossing nip now activated to its embossing setting, subsequent to which the moving web is cut off for completion of the splicing operation.
The present invention further provides an apparatus for splicing at least two single or multiple layer materials comprising air permeable soft paper webs while maintaining web tension during operation. The apparatus is characterized in that it includes a first suction chamber for retaining an end portion of a new web such as to provide trailing engagement against the moving web which is to be spliced. A second suction chamber over which the web for splicing moves, and over which the forward end portion of the new web also trails before splicing. A regulatable vacuum system for the suction chambers, an embossing nip placed downstream of the second suction chamber for bonding together the webs kept together with the aid of controlled air passage through them, and a cutting means for cutting off the moving web.
There has now been provided in accordance with the invention a method and apparatus for splicing at least two single or multiple layer materials comprising air permeable soft paper webs, where the splicing it
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Duni AB
Osele Mark
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