Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1996-11-15
1999-04-06
Mayes, Curtis
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156248, 156265, B32B 3100, B31D 102, B65C 900
Patent
active
058912908
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a device for the transfer of sections that are self-adhesive on one side from a moving first web onto a moving second web, portions to be discarded remaining attached on the first web, comprising a dispenser edge that is associated to and extends across the direction of the first web and around which the web is led with reversal of its direction when the sections are released.
To allow detachment of individual, one-side self-adherent sections from a first web and their transfer onto a second web, a web-shaped material must first be obtained and are available according to the present state of the art. To this end, cuts must be made such that the unnecessary self-adhesive material forms a coherent lattice which is peeled off immediately after the sections have been punched out. The desired scrapless sections may then easily be released by means of a conventional dispensing edge.
DESCRIPTION OF RELATED ART
The large amount of self-adhesive refuse resulting in this process is disadvantageous. If the waste consists of very expensive and highly pollutive material, this disadvantage is particularly serious. DE 42 32 279 describes a process wherein self-adhesive sections are punched, detached, and transferred to produce transdermal therapeutic systems. The advantage of the known method is that there is no self-adhesive waste; however, it is limited to rectangular or square sections.
DE 38 32 239 describes a process and a device for the partial distribution of individual components of a web. The partial distribution is achieved by free punching; the waste must form a coherent lattice to peel it off and wind it up. However, this process is not suitable for self-adhesive sections. GB 22 08 505 describes a specially shaped dispenser edge. To increase the rigidity of the sections to be released, it has a wave-like form. However, partial detachment is not achieved by means of this design. DE 31 04 035 describes a dispensing edge in the form of a roll having a central interruption. Said break serves as a rest for the axle and does not influence the dispensing function of the dispenser edge.
BRIEF DESCRIPTION OF THE INVENTION
It is the object of the present invention to advance and improve a device for the transfer of sections that are self-adhesive on one side from a moving first web onto a moving second web, comprising a dispenser edge that is associated to and extends across the direction of the first web and around which the web is guided with reversal of its direction when the sections are released, in such a manner that portions adhere to the first web attached; preferably, marginal portions remain on the web without having to form a coherent lattice. The dispenser edge has a leading edge which is perpendicular to the direction of travel of the first web.
According to the present invention this object is achieved in a device which is capable of transferring self-adhesives from one moving web to another moving web, by the fact that the design of the dispenser edge differs in the region of the portions which are not to be detached from that in the region of the sections which are to be detached.
According to a preferred embodiment, some regions of the dispenser edge are interrupted by at least one recess. The mechanism of this embodiment is based on the fact that the elastic supporting film is less deflected in those regions of the dispenser edge where it is interrupted, for example, by a recess; for this reason the portions which are punched free in this area or areas are not detached and remain adhering to the moving first web as single or coherent waste.
According to one embodiment the dispenser edge is interrupted by two lateral recesses which preferably are symmetrical to the central axis of the dispenser edge. This embodiment is particularly suitable if there are marginal portions, which is the case when corners of sections that are to be released are rounded or beveled. However, according to another embodiment, the dispenser edge may also be in
REFERENCES:
patent: 3574026 (1971-04-01), Kucheck
patent: 4059203 (1977-11-01), Wright
patent: 4303461 (1981-12-01), Le Mers
patent: 4369085 (1983-01-01), Hermann
patent: 4479842 (1984-10-01), Fujita
Deurer Lothar
Grader Ludwig
Hille Thomas
Steinborn Peter
LTS Lohmann Therapie-Systeme GmbH
Mayes Curtis
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