Patent US3785897A successfully refreshed from Google Patents.
US3785897A
Expired / Lapsed
US
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Method of making a disposable draw sheet
Assignee: BRIDGEWATER MANUFACTURING CORP A CORPOF NJ
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Filing: 1972-03-06
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Granted: 1974-01-15
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Expires: 1992-03-06
Abstract
Abstract This method of making a draw sheet, suitable for hospital use, has plastic film to which is laminated a highly absorbent nonwoven fabric over only that portion of the sheet which is on top when in use. The method is a continuous process that advances the web of plastic film from a supply roll and progressively folds film from both sides of the web over the top of the mid portion which is to be laminated to the absorbent material. The web becomes in effect a flattened tube. A web of the unwoven absorbent material is fed to the lower side of the flattened tube after adhesive has been applied to one of the webs to secure the absorbent material to the mid portion of the plastic web (i.e., bottom of the flattened tube). The laminated webs are cut into draw sheet length by a flying shear.
Inventors
- 👤 F Zipf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:22
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/12; A; A47; A47G; A47G9/00; A47G9/02; A47G9/0238; B31; B31D; B31D1/00; B31D1/0075; B32B3/00; B32B3/26; B32B3/28; B32B5/00; B32B5/02; B32B5/022; B32B2262/00; B32B2262/06; B32B2262/062; B32B2601/00; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/1008; Y10T156/101; Y10T156/1015
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
184 words
The method of making a disposable draw sheet having a plastic portion of a width that extends across the top of a mattress and that tucks under the sides thereof, and having an absorbent portion on top of the plastic portion and of less width than the plastic portion over the mid region of the draw sheet and with which the bed patient has contact, which method comprises advancing a plastic web in the direction of its length, progressively folding the edge regions of the web over the mid region and into contact therewith as the web advances, advancing a web of absorbent material in the same direction as the plastic web and at substantially the same speed, bringing the absorbent material into contact with the unfolded mid-region on the other side thereof from the side of the med-region with which the folded edge regions contact and at a location beyond that at which the edges of the web are folded over the mid-region, and applying adhesive to at least one of the advancing webs before they are brought into contact with one another.
Claim 2
Independent Claim
184 words
The method of making a disposable draw sheet having a plastic portion of a width that extends across the top of a mattress and that tucks under the sides thereof, and having an absorbent portion on top of the plastic portion and of less width than the plastic portion over the mid region of the draw sheet and with which the bed patient has contact, which method comprises advancing a plastic web in the direction of its length, progressively folding the edge regions of the web over the mid region and into contact therewith as the web advances, advancing a web of absorbent material in the same direction as the plastic web and at substantially the same speed, bringing the absorbent material into contact with the unfolded mid-region on the other side thereof from the side of the med-region with which the folded edge regions contact and at a location beyond that at which the edges of the web are folded over the mid-region, and applying adhesive to at least one of the advancing webs before they are brought into contact with one another.
Claim 3
Dependent Claim
104 words
The method described in claim 1 characterized by folding the plastic web to bring the opposite edges thereof into close and parallel relationship with one another on top of the mid region of the plastic web, and applying the adhesive continuously to the bottom of the plastic web across substantially the full width of the plastic web between the folds, and bringing into contact with the bottom of the plastic web an absorbent web having a width as wide as the adhesive-coated area of the plastic web, and pressing the advancing webs into contact with one another to effect a bonding by the adhesive.
Claim 4
Dependent Claim
65 words
The method described in claim 2 characterized by applying the adhesive to the plastic web at a location ahead of that where the webs are brought into contact with one another, and correlating the speed of travel of the web and the characteristics of the adhesive to obtain time for the adhesive to become tacky before it is brought into contact with the absorbent web.
Claim 5
Dependent Claim
44 words
The method described in claim 1 characterized by folding over the edges of the plastic web far enough to leave the region of the edges of the plastic web between the folds of substantially the same width as the web of the absorbent material.
Claim 6
Dependent Claim
145 words
The method described in claim 4 characterized by applying the adhesive continuously to substantially the full width of the plastic between the folds, spacing the location at which the webs are brought together beyond the adhesive application far enough for the adhesive to become tacky before the webs are brought into contact with one another, holding the webs together with the folded over the edge regions pressed flat against the mid region and with pressure applied to the top of the folded over edge region of the plastic portion and to the bottom of the absorbent portion to secure the plastic and absorbent portions to one another by the adhesive as they travel progressively beyond the location at which they are brought together, and severing the united webs as they come from the holding step and while in continuous motion to produce individual draw sheets.
Claim 7
Independent Claim
201 words
The method of making a disposable hospital draw sheet of a width that extends across the mattress of a bed and down the sides of the mattress and with ends that tuck under both sides of the mattress, which method comprises unrolling from a reel a waterproof plastic web having a width equal to the desired width of the draw sheet, advancing the web with continuous motion as it unrolls from the reel, folding the web while it advances and by said folding forming the web to form a flat tube with a longitudinal seam, applying adhesive to the flat tube on the side opposite to the seam of the flat tube, unrolling an absorbent non-woven fabric, that is somewhat narrower than the flat tube, from a reel with continuous motion, applying the non-woven fabric to the plastic web downstream from the adhesive-applying station and at a location where the adhesive is still sticky, pressing the non-woven fabric into firm contact with the web to bond the absorbent non-woven material to the plastic web as they travel together with continuous motion, and severing the assembled web and non-woven fabric at spaced locations along the flat tube to make individual draw sheets.
Claim 8
Independent Claim
201 words
The method of making a disposable hospital draw sheet of a width that extends across the mattress of a bed and down the sides of the mattress and with ends that tuck under both sides of the mattress, which method comprises unrolling from a reel a waterproof plastic web having a width equal to the desired width of the draw sheet, advancing the web with continuous motion as it unrolls from the reel, folding the web while it advances and by said folding forming the web to form a flat tube with a longitudinal seam, applying adhesive to the flat tube on the side opposite to the seam of the flat tube, unrolling an absorbent non-woven fabric, that is somewhat narrower than the flat tube, from a reel with continuous motion, applying the non-woven fabric to the plastic web downstream from the adhesive-applying station and at a location where the adhesive is still sticky, pressing the non-woven fabric into firm contact with the web to bond the absorbent non-woven material to the plastic web as they travel together with continuous motion, and severing the assembled web and non-woven fabric at spaced locations along the flat tube to make individual draw sheets.
Claim 9
Dependent Claim
33 words
The method described in claim 6 characterized by folding the plastic web to form a flat tube with the edges of the web confronting one another at an open seam of the tube.
Claim 10
Dependent Claim
22 words
The method described in claim 6 characterized by applying rolling pressure to both sides of the flattened tube through the folding step.
Claim 11
Dependent Claim
36 words
The method described in claim 6 characterized by applying the adhesive as a coating on the face of the non-woven fabric and in a limited amount that leaves the rest of the non-woven fabric water absorbent.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |