Absorbent pad and method and apparatus for making the same

• US 4,892,535 A
• Filed: 08/07/1987
• Issued: 01/09/1990
• Est. Priority Date: 08/07/1987
• Status: Expired due to Term

• Current Assignee: Procter & Gamble Hygien Aktiebolag
• Original Assignee: Landstingens Inkopscentral, LIC Ekonomisk Forening
• Inventors: Ahlstrand, Ove, Bjornberg, Sten
• Primary Examiner(s): Yeung, James C.
• Application Number:
  US07/082,725
• Time in Patent Office: 886 Days
• Field of Search: 604/358, 604/380, 604/366, 604/379, 604/369, 604/370, 604/365, 604/368, 604/374, 206/204
• US Class Current: 604/380
• CPC Class Codes: A61F 13/15642 by depositing continuous layers or pads of fibrous material on single sheets or webs
• CPC Class Codes: A61F 13/515 characterised by the interconnection of the topsheet and the backsheet
• CPC Class Codes: A61F 13/5323 having absorbent material located in discrete regions, e.g. pockets

Abstract

An absorbent pad such as an incontinence pad comprises a liquid-impervious back sheet with spaced islands of absorbent material thereon. A liquid-pervious cover sheet has pockets formed therein, in which the islands of absorbent material are disposed. The cover sheet is secured, either adhesively or by heat sealing, directly to the impervious sheet along lines that separate the islands of absorbent material and the pockets that contain them. The pad is formed by applying a strip of cover sheet material to a rotating multi-perforate drum and forming the pockets in the cover sheet material either mechanically, or by drawing hot air inwardly through the holes in the drum in the case of a heat-deformable material such as polypropylene fibers. The drum then rotates past a pocket-filling station, where absorbent material such as cellulose fluff is drawn into the pockets by vacuum applied internally of the drum. The cover sheet is then applied to the composite of cover sheet and absorbent material, and is firmly bonded to lines of cover sheet material that are free from absorbent material between the pockets, overlying the bridges that separate the holes through the drum. The composite is then removed from the drum and cut to size.

Claims

1. An absorbent pad comprising a liquid-impervious back sheet, a plurality of bodies of liquid-absorbent material disposed on one surface of the back sheet, and a liquid-pervious cover sheet covering said bodies of absorbent material and directly secured to the back sheet along lines which separate said bodies of absorbent material, these lines being substantially free from said absorbent material.

2. A pad as claimed in claim 1, in which at least most of said bodies are islands surrounded on all sides by said lines.

3. A pad as claimed in claim 1, in which said cover sheet is adhesively bonded to said back sheet along said lines.

4. A pad as claimed in claim 1, in which said cover sheet is cohesively secured to said back sheet along said lines.

5. A pad as claimed in claim 1, in which said back sheet is substantially flat and said cover sheet has pockets therein in the shape of and containing said bodies.