Gloss And Optically Detectable Splicing Tapes
Publication Date: 2015-Oct-07
The IP.com Prior Art Database
Optical sensors are commonly used in continuous roll processing There are a variety of indicators to which the sensors are tuned to detect One method is to use the flying splice tape as the indicator The gloss level of the exposed surface of a flying splice tape may interfere with splicing detection systems Previous work proposed multiple methods to modify this gloss This paper discloses that the choice of release liners is another means to modify the gloss level
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GLOSS AND OPTICALLY DETECTABLE SPLICING TAPES
Release liners, i.e., substrates or supports designed to temporarily protect an adhesive surface, are widely used in the tape industry. Such liners function by being able to cleanly release at low peel forces from the underlying surface, eg. adhesive. This releasability can be imparted in a variety of ways including selection of the support (eg., plastic films, paper, non-wovens, etc.), coatings / treatments (eg., silicones, fluorochemicals, urethanes, olefins) applied to the liner, and surface roughness of the liner.
Flying splice tapes are used in the paper and print industry to join supply rolls of web material, such as paper or film for example, for use in continuous processes such as coating, printing, etc. These processes often include exposure of the moving web to elevated temperature in order to dry applied coatings, inks, etc.
As the end of a first supply roll is approached a second supply roll is brought into position to be joined to the first supply roll on the fly without change of the line speed. Splicing tapes are typically used to join the second supply roll to the first supply roll by means of an exposed adhesive layer.
To successfully join the two rolls the splicing equipment must be able to detect the position of the flying splice tape on the second supply roll. This can be done in a variety of ways such as applying to the second supply roll a label, a mark, a metal foil insert, an ink layer, a colored adhesive layer, etc.
In one possible construction the optically detectable layer may run along the entire length and width of the flying splice tape. In other possible constructions the dimensions of the optically detectable layer may be less than the length and/or width of the flying splice tape.
In all instances it is required that equipment be able to detect the label, a mark, a metal foil insert, an ink layer, a colored adhesive layer, etc. and synchronize the splicing equipment to ensure the desired splicing operation is accomplished. An example of an optically detectable flying splice tape is described in EP 1544142.
It has been observed that the light reflecting cha...