Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS2117432 A
Publication typeGrant
Publication dateMay 17, 1938
Filing dateFeb 7, 1935
Priority dateFeb 7, 1935
Publication numberUS 2117432 A, US 2117432A, US-A-2117432, US2117432 A, US2117432A
InventorsChester E Linscott
Original AssigneeUs Rubber Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Process and apparatus for impregnating fibrous sheet material
US 2117432 A
Abstract  available in
Images(1)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

M y 17, 1938 v c. E. Lmsco'rr 2,117,432

PROCESS AND APPARATUS FOR IMPREGNATING FIBROUS SHEETMATERIAL Filed Feb. 7, 1935 'INVENTOR 7 6747/71? M7460 ATTORNEY Patcnted'May 17, loss Um'rso STATES ffj 2,117,432

PATENT orr cl:

PROCESS AND AIPABATUS FOR MEG- .NATING I'IBROUS SHEET MATERIAL chemia.

Linscott, Bidgcwood, 11.3., assisnor to United States Rubber Company, N. Y., a corporation of New Jersey New Yorlr,

Application rm 1, 1935, Serial No. am 3.0lahns. (cl. si-ss) woven or knitted fabrications of thread and yarn are commonly impregnated with rubber compositions, such as rubber latex, by passing the material throush a tanlr of the latex and thence ,between squeeze rolls. In such a process, especially where light weight and wide fabrics are interstices of the material is displaced by the impregnating composition, creating large amounts of ,undesirable foam in the impregnating fluid.

Furthermore, when it has been desired to coat 1' both sides of a fabric by conventional spreader methods, it has been necessary-to coat first one side and dry the material, then to coat theother side and dry again, a minimum of two spreader operations thus being required.

The present invention relates to the impregnation of fibrous sheet material with fluid rubber compositions without the use of squeeze rolls, thereby eliminating the disadvantages incident to that method of impregnation. It also provides a process and apparatus whereby flbrous sheet material may be impregnated, and coated on both faces in one operation by'direct application of a fluid rubber composition to one face only of the sheet material. It also makes it possible to use, with only minor changes, the same type of machines for latex impregnation as for conventional latex spreading.

In the coating of fabrics on one side only with latex according to common practice, trouble is frequently experienced due to the tendency of the latex to strike through the fabric at various points rubber over the entire upper and lower faces in a single spreading operation.

According to the present invention, the fluid rubber composition is applied directly, to the upper surface only of the travelling flbrous sheet material. and is caused to penetrate into and through sheet material to provide a coating on both sides thereof. A convenient method of accomplishing this is by, means of one or more spreading devices and rollers frictionally engag-- ing the upper face of the sheet material, the rollers preferably rotating in the direction opposite to the direction of travel of the material. It is also possible to use a stationary roll or a roller driven in the same direction as the travel of the material and driven either by the moving fabric itself or by external means. The roller itself may be a part of the means for applying the composition as well as the means for driving it into the travelling material. The penetration of the composition into and through the sheet material is also aided by the hydrostatic pressure of a bank of the fluid rubber composition maintained upon the material between the rollers and spreading devices. The composition is then distributed as desired and excess composition removed to the extent desired by a suitable arrangement of wiper and scraper knives frictionally engaging the upper and lower faces-of the sheet material.

It is desirable that the rubber composition or the fibrous sheet material, or both, have such characteristics that the sheet material is readily wetted by theiiuid composition, in order to facilitate the penetration of the composition into and through the sheet material. For this purpose either the rubber composition, or the sheet material, or both, may be treated with a suitable hols.

The drawing illustrates more or less diagrammatically one type of-apparatus for impregnating fibrous sheet material.

Referring more particularly to the figure, which is merely exemplary of the invention and illustrates a present preferred embodiment thereof, the fibrous sheet material I, in the form of a woven fabric, for example, is unwound from the roll 2 and drawn under tension through the impregnating means and drier to be described below and onto a windup roll 3. The fabric as it advances from the roll 2 passes under a smooth-faced roller 4 rotating as shown by the arrows in a direction opposite to the direction of travel of the fabric and thence under a spreading device such as doctor I. The surface of the roller 4 frictionally engages the upper surface of the fabric and drives into the same the latex 5 which is provided between the roller and the spreading device in the form of a pool or bank fed from the latex supply 6 and confined by the upper surface of the fabric i, the roller 4, the doctor I, and by stops or guides 8 situated on each side of the fabric between the roller 4 and spreader l. Latex from the pool or bank 5 is driven into and through the advancing fabric by virtue of the rotation of the roller 4 and the pressure of the tensioned fabric against the roller, these actions being supplemented by the hydrostatic pressure of the bank 5. The result of this process is that both the threads or yarns constituting the fabric become coated or impregnated, and a substantial part of the latex strikes through the interstices over the entire area of the fabric and exudes upon the under side of the fabric in the form of small globules or buttons or extending fingers adhering to the fabric. In order to minimize or nullify any tendency of surface tension or capillarity to draw the exuded latex back into the body of the fabric, it is preferred that the fluid latex composition have a relatively high viscosity and yield value, preferably at least several times the values for uncompounded normal latex. Concentrated latices are therefore suitable, and may if desired be further thickened by various known means. The spreader I regulates the thickness of the layer of fluid rubber composition retained on the upper surface of the fabric, which composition may be subsequently smoothed out or partially scraped off, as desired, by means of one or more scraper knives 9 arranged at suitable angles along the path of travel of the fabric. Thus, by permitting a relatively small amount of latex to be retained on the upper side of the fabric as it emerges from under the spreading device I, or by removing the excess of latex by means of scrapers 9, the amount of latex remaining on the upper side of the fabric may be so regulated that the individual threads of the fabric, coated with rubber,

stand out in relief, with the latex webbing across the interstices to form saucer-shaped depressions which are closed at the bottom, between the threads. In other words, the film deposited on the upper face of the fabric may be continuous, but irregular in contour, following the weave of the fabric. Or a greater amount of the latex may be retained on the upper face of the fabric so as to provide a smooth, even coating. The fluid rubber composition which exudes upon the under side of the fabric may be smoothed.out and distributed evenly over the under side of the fabric by wiper knives l arranged at a suitable sloping angle to the fabric. After the desired smoothing operations, the fabric may be passed through a drying tunnel conventionally shown at H and then wound up as at 3, the coated fabric being drawn through the drying tunnel under sufficient tension to hold the fabric out of contact with the present invention with a vulcanizable latex composition as follows:

Rubber (as twice creamed latex 66%) 100 Formaldehyde 2, Sodium isopropyl naphthalene sulfonate- 1. 25, Water 5. 0

Oleic acid g 2. 0 2,2-di-p-phenylol-propane 2 0 Water 18.0 Ammonium hydroxide -(28%) 5.0

Stearic acid .25

Bleached Montan wax 1 Casper w 75 Water 6. 0 Ammonium hydroxide (28%) 5 Whiting 5.0 Sulfur 1. 25 Zinc dimethyl dithiocarbamate .65 Zinc oxide .1 Sodium isopropyl naphthalene sulfonate .1 Oleic acid 1 Ammonium hydroxide 1 Water, 4. 5

This composition was compounded by mixing the various materials, the ingredients being added to the latex in groups as indicated above, the liquids as emulsions and the solids as a paste, and the whole diluted with water to a water content of 50%. The various ingredients of such a latex composition may be, varied as well known in the art or other latex compositions substituted, the above composition being merely cited as one example of a latex composition that has been found satisfactory for the purpose. A so-called 4.75 cotton sheeting (4.75 running yards per pound of 39 inch width), having a thread count of 68 x 72 (threads per inch of warp and weft, respectively) was fed under considerable tension at about 24 feet per minute under a smooth steel roller two inches in diameter rotating about 70 revolutions per minute in a direction opposite to the direction of travel of the fabric. A reservoir or bank of the latex equal to or greater than the height of the roller was provided on the upper surface of the fabric on the egress side of the roller and confined by the roller and by aspreading device or doctor situated two inches from the roller along the path of travel of the fabric. the fabric passed under the roller and spreading device, the under side of the fabric became covered with exuded globules of latex which had struck through the interstices of the fabric. The coatings on the upper and lower surfaces were smoothed out by scraper knives and the thus impregnated and coated fabric was dried in a drying tunnel at 200-220 F. Further coats of latex, as desired, were applied to either or both sides in the usual manner and the finished fabric vulcanized at 225 F. for 45 minutes.

Various modifications of the illustration in the drawing may be resorted to. For example, the fluid rubber composition may first be applied to the surface of the travelling sheet material by means of a spreading device and after such application the sheet material may be passed under a rotating roller such as roller 4 to drive the composition into the material. If desired,

anus:

the roller, the rubber composition being confined only by the roller and the surface of the inclined sheet material and the stops at the sides of thefabric, and being carried from the reservoir or bank on theupper surface of the fabric and flowing down the inclined fabric by gravity, as shown in the McGavack Patent 1,946,090, to form a smooth coherent coating. The spreading device, if used in conjunction with the roller 4, as shown at I, or if used to apply the fluid rubber composition to the sheet material prior to passage under the roller 4, may take the form of a conventional doctor, as shown, or may take the form of a grooved spreading device, as shown in the patent to Charles Dennison No. 1,975,195. It is possible to obtain even better impregnation by having a bank of latex in front of as well as behind the rotating roll 4. It is also possible to place the blade 1 ahead of bank 5 between the two. It is ewise possible to confine the bank of latex between two rolls, one placed at I as at present and'one replacing the doctor I.

Various other modifications will occur to those skilled in the art and it is not intended to limit the invention other than as set forth in the appended claims.

Having thus described my invention, what I claim and desire to protect by Letters Patent is:

1. A process for impregnating textile sheet material with an aqueous dispersion of rubber comprising advancing the material, applying the 4 and confine the aqueous dispersion of rubber to one surface of the material and driving the dispersion univ formly into and through the material, so that it exudes upon the opposite surface thereof, and distributing the dispersion which has been extruded through the interstices of the material smoothly and uniformly over the opposite surface of the material to form a continuous film thereover. A 2.-A process for impregnating textile sheet "material with an aqueous dispersion of rubber comprising treating either or both of the sheet material and the dispersion so that the sheet material is readily wetted by said dispersion, advancing the material, applying the aqueous dispersion of rubber to one surface of the material and driving the dispersion uniformly into and through the material to the opposite surface thereof, and distributing the dispersion which has been extruded through the interstices of the material smoothly and uniformly over the opposite surface of the material to form a continuous film thereover.

3. A process for impregnating fabric with an aqueous dispersion of rubber, said fabric and dispersion being mutually wettable, which com prises applying the aqueous dispersion of rubber, driving the dispersion uniformly into and through the fabric to the opposite surface thereof, and distributing the dispersion which has been extruded through the interstices of the fabric smoothly and uniformly over the opposite surface of the material to form a continuous film thereover.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2433270 *Apr 6, 1944Dec 23, 1947Goldman Ida YMethod of coating stitched fabric
US2573052 *Jan 24, 1948Oct 30, 1951Parker Raymond HLiquid coating device
US2778365 *Jun 26, 1950Jan 22, 1957Daniel SilvermanDisposable ash receiver
US3950573 *Dec 11, 1974Apr 13, 1976Hardcast, Inc.Method for making sealing tapes
US5004643 *Mar 10, 1989Apr 2, 1991Sili-Tex, Inc.Silicone polymer-internally coated webs
US5698303 *Jun 7, 1995Dec 16, 1997Nextec Applications, Inc.Controlling the porosity and permeation of a web
US5846604 *Jun 7, 1995Dec 8, 1998Nextec Applications, Inc.Controlling the porosity and permeation of a web
US5856245 *Jun 7, 1995Jan 5, 1999Nextec Applications, Inc.Articles of barrier webs
US5874164 *Jun 7, 1995Feb 23, 1999Nextec Applications, Inc.Barrier webs having bioactive surfaces
US5876792 *Mar 17, 1995Mar 2, 1999Nextec Applications, Inc.Methods and apparatus for controlled placement of a polymer composition into a web
US5912116 *Jun 7, 1995Jun 15, 1999Nextec Applications, Inc.Methods of measuring analytes with barrier webs
US5954902 *Jun 7, 1995Sep 21, 1999Nextec Applications, Inc.Controlling the porosity and permeation of a web
US5958137 *Nov 3, 1997Sep 28, 1999Nextec Applications, Inc.Apparatus of feedback control for the placement of a polymer composition into a web
US6040251 *Jun 7, 1995Mar 21, 2000Nextec Applications Inc.Garments of barrier webs
US6071602 *Jan 27, 1998Jun 6, 2000Nextec Applications, Inc.Controlling the porosity and permeation of a web
US6083602 *Jun 7, 1995Jul 4, 2000Nextec Applications, Inc.Incontinent garments
US6129978 *Nov 3, 1997Oct 10, 2000Nextec Applications, Inc.Porous webs having a polymer composition controllably placed therein
US6289841Nov 30, 1997Sep 18, 2001Nextec Applications, Inc.Method and apparatus for controlled placement of a polymer composition into a web
US6312523Sep 27, 1999Nov 6, 2001Nextec Applications, Inc.Apparatus of feedback control for the placement of a polymer composition into a web
US7452436Mar 9, 2006Nov 18, 2008Curt G. Joa, Inc.Transverse tape application method and apparatus
US7533709May 31, 2005May 19, 2009Curt G. Joa, Inc.High speed vacuum porting
US7537215Apr 22, 2005May 26, 2009Curt G. Joa, Inc.Method and apparatus for securing stretchable film using vacuum
US7618513May 31, 2005Nov 17, 2009Curt G. Joa, Inc.Web stabilization on a slip and cut applicator
US7638014Dec 29, 2009Curt G. Joa, Inc.Method of producing a pants-type diaper
US7640962Apr 20, 2005Jan 5, 2010Curt G. Joa, Inc.Multiple tape application method and apparatus
US7703599Apr 12, 2005Apr 27, 2010Curt G. Joa, Inc.Method and apparatus for reversing direction of an article
US7708849Jan 4, 2006May 4, 2010Curt G. Joa, Inc.Apparatus and method for cutting elastic strands between layers of carrier webs
US7770712Aug 10, 2010Curt G. Joa, Inc.Article transfer and placement apparatus with active puck
US7780052Aug 24, 2010Curt G. Joa, Inc.Trim removal system
US7811403May 7, 2007Oct 12, 2010Curt G. Joa, Inc.Transverse tab application method and apparatus
US7861756May 8, 2007Jan 4, 2011Curt G. Joa, Inc.Staggered cutting knife
US7909956Aug 13, 2009Mar 22, 2011Curt G. Joa, Inc.Method of producing a pants-type diaper
US7975584Jul 12, 2011Curt G. Joa, Inc.Single transfer insert placement method and apparatus
US8007484Aug 30, 2011Curt G. Joa, Inc.Pants type product and method of making the same
US8016972Sep 13, 2011Curt G. Joa, Inc.Methods and apparatus for application of nested zero waste ear to traveling web
US8172977May 8, 2012Curt G. Joa, Inc.Methods and apparatus for application of nested zero waste ear to traveling web
US8182624Mar 11, 2009May 22, 2012Curt G. Joa, Inc.Registered stretch laminate and methods for forming a registered stretch laminate
US8293056Oct 23, 2012Curt G. Joa, Inc.Trim removal system
US8398793Jul 20, 2007Mar 19, 2013Curt G. Joa, Inc.Apparatus and method for minimizing waste and improving quality and production in web processing operations
US8417374Apr 26, 2010Apr 9, 2013Curt G. Joa, Inc.Method and apparatus for changing speed or direction of an article
US8460495Dec 27, 2010Jun 11, 2013Curt G. Joa, Inc.Method for producing absorbent article with stretch film side panel and application of intermittent discrete components of an absorbent article
US8557077Mar 21, 2011Oct 15, 2013Curt G. Joa, Inc.Method of producing a pants-type diaper
US8656817Mar 7, 2012Feb 25, 2014Curt G. JoaMulti-profile die cutting assembly
US8663411Jun 6, 2011Mar 4, 2014Curt G. Joa, Inc.Apparatus and method for forming a pant-type diaper with refastenable side seams
US8673098Oct 25, 2010Mar 18, 2014Curt G. Joa, Inc.Method and apparatus for stretching segmented stretchable film and application of the segmented film to a moving web
US8794115Jul 7, 2011Aug 5, 2014Curt G. Joa, Inc.Single transfer insert placement method and apparatus
US8820380Mar 29, 2012Sep 2, 2014Curt G. Joa, Inc.Differential speed shafted machines and uses therefor, including discontinuous and continuous side by side bonding
US9089453Jun 11, 2013Jul 28, 2015Curt G. Joa, Inc.Method for producing absorbent article with stretch film side panel and application of intermittent discrete components of an absorbent article
US9283683Apr 24, 2014Mar 15, 2016Curt G. Joa, Inc.Ventilated vacuum commutation structures
US9289329Dec 4, 2014Mar 22, 2016Curt G. Joa, Inc.Method for producing pant type diapers
US20050233881 *Apr 12, 2005Oct 20, 2005Curt G. Joa, Inc.Method and apparatus for reversing direction of an article
US20050244596 *Apr 30, 2004Nov 3, 2005Highland Industries, Inc.Coated airbag fabric
US20050245152 *Apr 30, 2004Nov 3, 2005Highland Industries, Inc.Coated airbag fabric
US20050245154 *Apr 30, 2004Nov 3, 2005Highland Industries, Inc.Coated airbag fabric
US20050275148 *Apr 22, 2005Dec 15, 2005Curt G. Joa, Inc.Method and apparatus for securing stretchable film using vacuum
US20060265867 *May 31, 2005Nov 30, 2006Curt G. Joa, Inc.Use of ultrasonic horn to mechanically secure hooks to a smooth material web
US20070267149 *May 18, 2006Nov 22, 2007Curt G. Joa, Inc.Trim removal system
USD684613Jun 18, 2013Curt G. Joa, Inc.Sliding guard structure
USD703247Aug 23, 2013Apr 22, 2014Curt G. Joa, Inc.Ventilated vacuum commutation structure
USD703248Aug 23, 2013Apr 22, 2014Curt G. Joa, Inc.Ventilated vacuum commutation structure
USD703711Aug 23, 2013Apr 29, 2014Curt G. Joa, Inc.Ventilated vacuum communication structure
USD703712Aug 23, 2013Apr 29, 2014Curt G. Joa, Inc.Ventilated vacuum commutation structure
USD704237Aug 23, 2013May 6, 2014Curt G. Joa, Inc.Ventilated vacuum commutation structure
WO1989008553A1 *Mar 13, 1989Sep 21, 1989Sili-Tex, Inc.Silicone polymer fiber encapsulated webs
Classifications
U.S. Classification427/358
International ClassificationD06N7/06
Cooperative ClassificationB05D1/26
European ClassificationD06N7/06