Process for manufacturing embossed nonwoven fibrous products

• US 4,476,078 A
• Filed: 05/04/1982
• Issued: 10/09/1984
• Est. Priority Date: 05/04/1982
• Status: Expired due to Term

• Current Assignee: James River-Dixie/Northern, Inc.
• Original Assignee: James River-Dixie/Northern, Inc.
• Inventors: Tao, Thomas M.
• Primary Examiner(s): Hall, James R.
• Application Number:
  US06/374,700
• Time in Patent Office: 889 Days
• Field of Search: 264/119, 264/128
• US Class Current: 264/119
• CPC Class Codes: D04H 1/425 Cellulose series
• CPC Class Codes: D04H 1/5418 Mixed fibres, e.g. at least two chemically different fibres or fibre blends
• CPC Class Codes: D04H 1/64 the bonding agent being applied in wet state, e.g. chemical agents in dispersions or solutions
• CPC Class Codes: D04H 1/66 at spaced points or locations D04H1/68 takes precedence
• CPC Class Codes: D04H 1/732 by fluid current, e.g. air-lay

Abstract

A process for manufacturing embossed, nonwoven fibrous products comprising the steps of subjecting a binder-treated fibrous dry laid web to a low cure treatment to obtain a moldable web with good physical integrity; embossing the low cure treated web; and fully curing the web.

Claims

1. A process for manufacturing embossed air laid nonwoven fibrous webs comprising the steps of:

(a) applying a cross-linkable binder to a fibrous air laid nonwoven web;

(b) partially curing the binder to provide a partially cured and moldable web that maintains physical integrity during transport to an embossing zone, and during embossing;

(c) embossing the partially cured web; and

(d) fully curing the embossed web.

2. The process of claim 1 in which the binder is partially cured to a percent cure of from 15-90%.

3. The process of claim 1 in which the binder is partially cured to a percent cure of from 55-80%.

4. The process of claim 3 in which the binder is an aqueous system containing a cross-linking agent.

5. The process of claim 4 in which the binder is applied to the web by spraying.

6. The process of claims 4 or 5 in which heat is applied to the web during the partial curing step and the fully curing step.

7. A process for manufacturing embossed air laid nonwoven fibrous webs comprising the steps of:

(a) applying in a first application zone a cross-linkable binder to one side of a fibrous air laid nonwoven web;

(b) partially curing the binder in a first partial curing zone to provide a partial cure which results in a web that maintains physical integrity during transport through a second binder application zone;

(c) applying in a second binder application zone a cross-linkable binder to the other side of said air laid nonwoven web;

(d) partially curing in a second partial curing zone the binder in said web after passage from the second binder application zone to provide a moldable web having a 15-90% cure;

(e) embossing the partially cured web after passage of said web from the second partial curing zone; and

(f) fully curing the embossed web.

8. The process of claim 7 in which the binder is partially cured by passage through the second partial curing zone to a percent cure of 55-80%.

9. The process of claim 8 in which the binder is an aqueous system containing a cross-linking agent.

10. The process of claim 9 in which the binder is applied to the web by spraying.

11. The process of claims 8 or 9 in which heat is applied to the web during the partial curing steps.

12. A process for manufacturing embossed air laid nonwoven fibrous webs comprising the steps of:

(a) applying in a first application zone a cross-linkable binder to one side of a fibrous air laid nonwoven web;

(b) partially curing the binder in a partial curing zone to a 15-90% cure to produce a moldable web;

(c) embossing the moldable web;

(d) applying after the embossing step a binder to the other side of said fibrous air laid nonwoven web, and

(e) fully curing the binder applied before and after the embossing step.

13. The process of claim 12 in which the binder is partially cured to a 55-80% cure.

14. The process of claim 13 in which the binder is an aqueous system containing a cross-linking agent.

15. The process of claim 13 in which the binder is applied to the web by spraying.

16. The process of claim 13 in which heat is applied to the web during the partial curing step.