Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1991-02-28
1993-06-22
Ball, Michael W.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
28101, 156177, 156179, 156439, 156440, B65H 5728
Patent
active
052213900
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method and apparatus for positioning at least one elastic thread, band or like element in a pre-determined pattern on a sheet material web for a disposable absorbent article with the aid of a thread outfeed means and a thread outlet. The method and apparatus are particularly intended for laying out elastic threads intended to form the leg and waist elastic of diapers.
It is known in the manufacture of so-called disposable diapers to provide the diapers with leg elastic, so that the diaper will fit snugly around the thighs of the wearer. For reasons of manufacture, the elastic threads used to this end in known diapers are placed in mutually parallel relationship. An example of such diapers is found described and illustrated in U.S. Pat. No. 3,860,003. These diapers comprise absorbent pads of hour-glass configuration, the narrow central part of which is located centrally between the wearer's legs in use. The use of elastic threads which extend in straight, mutually parallel lines in the longitudinal direction of the diaper, however, results in chafing against the wearer's skin, on the inward sides of the thighs.
It is also known to position the elastication in a V-shape pattern, in which the elastic intersects the absorbent pad in the vicinity of the crotch part of the diaper. Diapers which are provided with this type of elastication will better conform to the contours of the wearer's body than a diaper manufactured in accordance with the aforesaid U.S. patent specification, besides avoiding unpleasant chafing of the wearer's crotch.
It is also known to arrange elastic threads in a diamond or network configuration and to produce curved leg elastic similar to that used in tailored leg apparel. One method of producing such elastication is described and illustrated in our Swedish Patent Specification 8406071-4.
It is also conceivable to lay elastic threads in a curved path on a continuously advancing web of material, for instance by guiding the thread laying devices electrically, in a backward and forward motion across the web. Such a method of manufacture, incorporating rapid transfer movements, will be complicated, however, particularly in the case of high speed manufacturing lines.
Our Swedish Patent Application 8801324-8 teaches a method and apparatus for laying out elastic threads or filaments in a curved path, with the aid of one or more rotating rolls which have peripherally arranged thread-guiding grooves or slots.
The object of the present invention is to provide a method of the aforesaid kind which will ensure uniform tension in the laid threads; which will enable the threads to be laid with good precision; which can be effected with the aid of only a few moveable components; which will enable the threads to be laid out at high speeds; and which will enable the threads to be laid out in mutually different patterns.
This object is achieved in accordance with the invention by means of a method having the characteristic features set forth in claim 1. Because the thread outlet need only be given a rotational movement, the threads can be laid out at high speeds. This renders the inventive method highly suitable for laying out elastic threads in the manufacture of diapers. Furthermore, the threads can be laid out with great precision, since the precision concerned in the present respect is dependent solely on the accuracy at which the thread dogging elements, thread carriers or like devices are positioned.
The invention also relates to apparatus for carrying out the inventive method, the characteristic features of which apparatus are set forth in the following claim 8.
So that the invention will be more readily understood, a number of exemplifying embodiments of the invention will now be described in greater detail with reference to the accompanying drawings, in which
FIG. 1 is a schematic perspective view of a first embodiment of an inventive apparatus particularly suited for laying out elastic threads on a web of material;
FIG. 2 illustrated the relative movement path of
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Indrebo Leidulf
Johansson Dan
Persson Lennart
Ball Michael W.
Maki Steven D.
Molnlyke AB
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