Method and apparatus for securing elastic tapes to a material web
AssigneeWinkler+Duennebier Maschinenfabrik+Eisengiesserei GmbH & Co. KG.
InventorKurt Stemmler
Life of this patent
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Abstract
Uniform lengths of elastic tape are secured to a continuously advancing mrial web, for example, to make baby diapers. First an intermittently advancing tape is repeatedly gathered, for example, by laying tape sections into a depression of defined dimensions, to relieve the tape sections of any stretching. This assures tape sections of uniform length which are then stretched, cut and applied to the material web, for example, by an adhesive bonding. The apparatus used for performing these steps has several cooperating rollers of which the first has the depressions in its surface and is rotated intermittently while the second roller is rotated continuously. The spacings between neighboring tape sections bonded to the web preferably have a uniform length.
Claims15
A method for securing a determined length of an elastic tape to a material web, comprising the following steps:
- (a) continuously advancing said material web,
- (b) discontinuously advancing said elastic tape and intermittently gathering sections of said elastic tape to substantially free the tape sections from any stretching force to assure a uniform length for each section,
- (c) sequentially stretching said gathered tape sections,
- (d) cutting off said stretched tape sections, and
- (e) sequentially bonding cut-off tape sections to said advancing material web at substantially uniform spacings between neighboring tape sections bonded to said material web.
An apparatus for securing a determined length of an elastic tape to a material web, comprising:
- (a) means for continuously advancing said material web,
- (b) first tape supply roller means (5) for discontinuously advancing said elastic tape (6), said first roller means having a surface with curved depressions (9) in said surface for intermittently gathering sections of said elastic tape into said depressions (9) to substantially free said sections from any stretching force to assure a uniform length for each section,
- (c) second continuously rotating stretching roller means (4) arranged for cooperation with said first roller means for sequentially stretching said gathered tape sections,
- (d) cutting means arranged for cutting off a stretched tape section, and
- (e) means for sequentially transferring and bonding cut-off tape sections to said advancing material web at substantially uniform spacings between neighboring tape sections bonded to said material web.
Dependencies are inferred from the claim text.