Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1995-03-15
1996-12-10
Aftergut, Jeff H.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156160, 156164, 156177, 156229, 156433, 156439, 156441, 156495, 156496, A61F 1315
Patent
active
055826687
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method and an arrangement for applying elastic elements to an elongated, moving web of material. The method and the arrangement are particularly intended for application when mounting leg elastic on diapers, incontinence guards and like absorbent articles.
2. Discussion of Related Art
When manufacturing such articles, they are often provided with elastic threads or bands in those parts which extend around the wearer's thighs when worn, so as to increase safety against leakage and to improve shape conformity to the wearer's thighs. In order for such leg elastic to extend around the thighs of the wearer of a modern pants-type diaper, it is necessary for the leg elastic to follow the outer contours of the diaper. One method of achieving this is known from Applicant's International Application WO 89/09550, according to which elastic threads are laid-out in curves, by guiding the threads in peripheral grooves of varying axial amplitude on a rotating roller. This method, however, can only be applied for mounting leg elastic essentially in the direction of movement of an underlying material web.
Applicant's International Patent Application WO 90/00514 discloses a method of mounting leg elastic transversely to the movement direction of an underlying material web, in which elastic threads are laid around thread holding elements by a rotating thread laying-out device, said elements moving at the same speed as an underlying material web, whereafter the threads are brought into contact with the web and fastened thereto. This method is primarily suitable for producing different patterns of elastic threads in which the threads extend linearly between the longitudinally extending edges of the material web. An intricate pattern of thread holding elements is required when wishing to mount the elastic threads in a curved shape, for instance so as to follow the outer contours of a diaper of hourglass shape.
OBJECTS AND SUMMARY
An object of the present invention is to provide a method and an arrangement by means of which elastic elements can be mounted on an elongated, moving web of material, such as to enable the elements to be mounted generally transverse to the movement direction of the web in a curved path which, for instance, coincides with the outer contour of a diaper of hourglass shape.
According to the present invention, this is achieved with a method of mounting elastic elements on an elongated, moving web of material in which an elastic element extends between two holder elements which can be moved in a given direction of movement, essentially at right angles to the movement direction of the holder elements, wherein the method is characterized in that different points of an elastic element are moved at different speeds in relation to one another transversely in relation to the direction of movement, and in that the elastic element is fastened to the material web subsequent to having achieved given distances in the movement direction between the different points of the elastic element as a result of the different movement speeds.
According to one preferred embodiment of the inventive method, the elastic element is gripped at least one point between the holder elements, this point being caused to move in the movement direction at a speed which differs from the speed at which the holder elements move.
According to one advantageous variant of the preferred. embodiment of the inventive method, the holder elements are moved at the same speed as a moving material web onto which the elastic element located between the holder elements shall be mounted.
According to another advantageous variant of the preferred embodiment of the inventive method, the holder elements are moved at a speed which is different to the speed at which the material web onto which the elastic element that is located between the holder elements shall be mounted moves.
The invention also relates to an arrangement for mounting elastic elements onto an elongated,
REFERENCES:
patent: 4578133 (1986-03-01), Oshefsky et al.
patent: 4776911 (1988-10-01), Ude et al.
patent: 4867825 (1989-09-01), Gidge
Aftergut Jeff H.
Molnlycke AB
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