Composite cover material for absorbent articles and the like

• US 4,781,962 A
• Filed: 09/09/1986
• Issued: 11/01/1988
• Est. Priority Date: 09/09/1986
• Status: Expired due to Term

• Current Assignee: Kimberly-Clark Worldwide Incorporated (Kimberly-Clark Corporation)
• Original Assignee: Kimberly-Clark Corporation
• Inventors: Zamarripa, Isidro B., Tomas, Juna D. M.
• Primary Examiner(s): Bell, James J.
• Application Number:
  US06/905,230
• Time in Patent Office: 784 Days
• Field of Search: 428/137, 428/138, 428/170, 428/171, 428/172, 428/198, 428/284, 428/286, 428/296, 428/68, 428/903, 428/913, 428/280, 428/282, 604/378, 604/379, 604/382
• US Class Current: 428/138
• CPC Class Codes: A61F 13/511 Topsheet, i.e. the permeable cover or layer facing the skin
• CPC Class Codes: A61F 13/5116 being formed of multiple layers A61F13/5123 takes precedence
• CPC Class Codes: A61F 13/5123 the apertures being formed on a multilayer top sheet
• CPC Class Codes: A61F 13/51311 the permeability gradient being in the vertical direction
• CPC Class Codes: A61F 2013/51078 being embossed
• CPC Class Codes: A61F 2013/51355 for improving fluid flow
• CPC Class Codes: B32B 2307/726 Permeability to liquids, absorption
• CPC Class Codes: B32B 2307/73 Hydrophobic
• CPC Class Codes: B32B 2555/02 Diapers or napkins
• CPC Class Codes: B32B 27/12 next to a fibrous or filamentary layer
• CPC Class Codes: B32B 3/10 characterised by a discontinuous layer, i.e. formed of separate pieces of material
• CPC Class Codes: B32B 5/022 Non-woven fabric
• CPC Class Codes: Y10S 428/903 Microfiber, less than 100 micron diameter
• CPC Class Codes: Y10S 428/913 Material designed to be responsive to temperature, light, moisture
• CPC Class Codes: Y10T 428/24322 Composite web or sheet
• CPC Class Codes: Y10T 428/24331 including nonapertured component
• CPC Class Codes: Y10T 428/24603 Fiber containing component
• CPC Class Codes: Y10T 428/24612 Composite web or sheet
• CPC Class Codes: Y10T 428/24826 Spot bonds connect components

Abstract

A composite cover material for absorbent articles and the like and a method for making the same are disclosed herein. The cover material is made of a thermoplastic film in contact with an external layer of nonwoven material. Selective point application of heat and pressure to the external surface of the nonwoven material causes the formation of a plurality of densified and partially fused areas in the nonwoven which are in vertical alignment with a corresponding plurality of concurrently formed perforations in the film. The densified and fused areas in the nonwoven act to mask the perforations in the film and in addition, restrict fluid flow when the cover material is under compression by partially blocking the performations in the film.

Claims

1. A composite cover material comprising:

a layer of thermoplastic film material having a plurality of fluid transmitting perforations extending therethrough, and

a layer of fluid pervious nonwoven web material adjacent and bonded to one side of said perforated film, said nonwoven material further having discrete areas of densified and fused material in vertical alignment with said perforations in said thermoplastic film, whereby said area of densified and fused material act as a mask with respect to said film perforations and further act to restrict fluid flow through said perforations when said film and said nonwoven are compressed.

2. The cover material of claim 1 wherein said fluid pervious nonwoven material is hydrophobic.

3. The cover material of claim 1 wherein said nonwoven material has a higher melting point than the melting point of said film.

4. The cover material of claim 1 wherein said bonding between said film and said layer of nonwoven is primarily located about the perforations in said film.

5. The cover material of claim 1 wherein at least a portion of said areas of densified and fused nonwoven web material have individual pieces of thermoplastic film fused to a side of said areas adjacent said film to further aid in the masking and the restriction of fluid flow when said cover material is compressed.

6. A composite cover material comprising:

a layer of thermoplastic film having a plurality of fluid transmitting perforations extending therethrough, and

a layer of fluid pervious nonwoven web material adjacent and bonded to one side of said perforated film, said bonding between said perforated film and said layer of nonwoven being primarily located about the perforations in said film, said nonwoven material having a higher melting point than the melting point of said film, said nonwoven material having discrete areas of densified and fused material in vertical alignment with said perforations in said thermoplastic film and wherein at least a porton of said areas of densified and fused material have individual pieces of thermoplastic film fused to a side of said areas adjacent said film, whereby said areas act to mask said film perforations and further act to restrict fluid flow through said perforations when said film and nonwoven layers are compressed.

7. An absorbent article comprising:

a cover material having a film of thermoplastic material with a plurality of fluid transmitting perforations extending therethrough and a layer of fluid pervious nonwoven web material adjacent and bonded to one side of said perforated film, said nonwoven material having discrete areas of densified and fused material in vertical alignment with said perforations in said thermoplastic film;

a backing sheet; and

an absorbent pad material disposed between said film of said cover material and said backing sheet.