Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1995-11-09
1997-09-09
Aftergut, Jeff H.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156160, 156199, 156201, 156204, 156229, 156461, 156465, 156494, 6043851, 6043852, B31D 504, A61F 1315
Patent
active
056651910
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method and to a device for creating in a web of sheet or layer material a fold which includes at least one elastic thread.
It is known to provide in those casing layers or sheets of diapers and like articles which lie proximal to the wearer in use longitudinally extending, sealed elastic-thread containing side folds, so as to form barriers which prevent liquid flowing on the upper surface of the casing sheet from reaching the side edges of the diaper. Examples of such barrier devices are disclosed in EP-B1 0,219,326 and U.S. Pat. No. 4,704,116. Diapers are now mass-produced at high-production rates, principly by placing absorbent bodies or pads on a moving web of sheet material and placing another moving web of sheet material on top of the first web carrying said absorbent bodies, whereafter the two layers of sheet material are joined together and the individual diapers are cut from the thus joined webs.
It has been found difficult in such manufacturing processes to provide folds of the aforesaid kind in the diaper casing sheets while maintaining a high rate of production at the same time.
The object of the present invention is to solve this problem and to provide a method and an arrangement by means of which a fold which contains at least one. elastic thread can be created in a web of material and which can be applied with known diaper manufacturing methods without causing interruptions in the manufacturing process and without needing to modify the manufacturing process, or at least to only a small extent.
This object is achieve in accordance with the invention with a method of the aforedescribed kind which is characterized by placing the web of material on two mutually spaced carrier elements; placing at least one pre-stretched elastic thread above the web in the space between the mutually spaced carrier elements; mutually combining the carrier elements while at the same time moving the elastic thread or threads down into the space between said carrier elements and in abutment with said web in keeping with the rate at which the carrier elements are brought together, until at least one of the two mutually opposing edges of the carrier elements which approach one another as the carrier elements are combined reaches the movement path of an elastic thread; and Joining together those parts of the web which abut one another in the mutually combined state of the carrier elements, at least along a line which extends transversely in relation to the direction in which the carrier elements are combined one with the other. This method can be integrated readily with known production processes in which a web of casing material is brought together, or combined, with another web of material intended for the remainder of the product, so as to form the final product, by superimposing a forward feeding movement on the movement which combines the carrier elements one with the other.
A device for carrying out the inventive method is characterized by two web-carrying elements which can be moved relative to one another between a position in which they are mutually separated and a position in which they are mutually combined; carrier element movement means; means for holding one or more elastic threads in a given position above the carrier elements and in the space defined therebetween in their mutually separated position; means for moving the elastic thread or threads down in the space between said carrier elements in keeping with the rate at which the carrier elements are moved towards one another; and means for joining mutually opposing parts of the web material in the combined state of the carrier elements, at least along a line which extends transversely in relation to the direction in which the carrier elements are brought to a mutually combined state.
In a preferred embodiment of the invention, the arrangement includes a rotatable wheel which carries a plurality of peripheral carrier elements which can be moved circumferentially in relation to one another with the aid of link mechanisms
REFERENCES:
patent: 2490451 (1949-12-01), Magid
patent: 4704116 (1987-11-01), Enloe
patent: 4900384 (1990-02-01), Sanders et al.
patent: 4904332 (1990-02-01), McKeown
patent: 5190606 (1993-03-01), Merkatoris et al.
Indreb.o slashed. Leidulf
Johansson Dan
Aftergut Jeff H.
SCA Molnlycke AB
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