US2610936A

US2610936A - Reinforced paper article

Info

Publication number: US2610936A
Application number: US109482A
Authority: US
Inventors: Arthur E Carlson
Original assignee: Individual
Current assignee: Individual
Priority date: 1949-08-10
Filing date: 1949-08-10
Publication date: 1952-09-16
Anticipated expiration: 1969-09-16

Description

Sept. 16, 1952 A. E. CARLSON REINFORCED PAPER ARTICLE Filed Aug. 10. 1949 permit a thin flat ribbon-like band to be obtained i having a very high tensile strength. in the aggregate, yet only a few thousandths in thickness. l

f'Filament," as used herein, .isa tiny,member.... In the textile industry hundreds of'su'ch filaments' are twisted together to form a yarn forweaving. ti; Applicant does not use the term fllament in the sense of a large member where a singlefilanent constitutes 'a weaving .material. such filaments are properly referred to as monorfilaments.

` 'A "compact thin ribbon," as used herein, consists of a plurality 'of substantially parallel contacting filaments of synthetic yieldablematerial, which ribbon has a thickness equal to the diameter of a number of filaments and a width many times greater than ,the 'thickness For these reenforcing ribbons, I prefer to employ a very considerable number of individual filaments, at'least approximately one hundred and preferably as many as' five hundred or more filaments of rayon, .nylon, or other untwisted synthetic material. Thus, `a ribbon of-'1650 denier rayon, approxlmatelyi 0.0625" wide and only about' 0.0035" in thickness, may contain as many as one thousand individual filaments arranged in a plurality of levels; such ribbons, spaced about four to the inch over the" paper, aiford a very marked increase in tensile' strength as 'Compared with the unreenf orced paper, even though the ribbon adds but little to the overall thickness of the paper. Alternatively, some what smaller ribbon, of approximately 800' denier, may beused by increasing the number of ribbons per inch of paper; While the' individual filaments'of the ribbon are considerably weaker: than the natural fibers such' as sisal thatheretofore have been employed; nevertheless when the filaments are arranged in a -flat, compact untwisted band, the aggregate strength of the unit as a whole is very considerable and extremely eifective to reenforce the paper stock in the direction of the ribbon." I

To secure these reenforcing elemen'ts'to the paper stock while employing-a minimum of adhesive, the adhesive -is employed only at the interface between the paper' and'the ribbons of filaments. This isaccomplished most readily by coating the ribbon with adhesive before bringing the ribbon into 'contact with the paper. Because of the multiplicity of fine filaments and their arrangement in a flat ribbon, the ribbon readily takes up by capillary action' a sufcient quantity of adhesive to saturate the ribbon and thereby insure a firm bond of all filaments to one another and to the paper.

Whilevarious types of adhesive may be em ployed, I prefer `to use 'a non-asphaltic' water: proof adhesive, for example, an adhesiveemploying a synthetic resin, orfa latex-base adhesive. such an adhesive, though appreciably more expensive than the black asphaltum usually employed in stay tapes, possesses marked ad- 'of" an inch necessaryjo ,attain the desired strength.

vantages over the low cost asphalt. Because of the localized application of the adhesive, wherein the ribbons of fine filaments are relied on to carry the adhesive to the paper, only small amounts of adhesive, in some cases as little as ten pounds per ream of paper, may be required to provide a strong bond of all filaments, as Compared with as much as one hundred pounds of asphalt per ream of paper which may be employed'inthe case of the two ply laminated tapes in order to bondlthe. plies of paper and 'eenforcing cords or fibers.

:The adhesively-wetted reenforcing ribbons are preierably secured to the kraft stock at evenly spaced intervals, as closely spaced as may be In general, approximately three to six ribbons per inchlwill be'satisfactory. Upon bringing the ribbonsinto contact with the paper, pressure may te' applied to acceleratethe bonding of the adhesive, pressure also serving to spread out the filaments and indent the ribbon slightly in the paper`;therebyreducing to a minimum the height of the reenforcing ribbons above the adjacent. paper stock.- If desired, thefilaments or bands. maybe dyed, or coloring added to the adhesive. to cause the color of the ribbons to blend with the paper stock and thus be ;relatively inconspicuous in the finished product.` i

'Because' of the' localized application of adhesive beneath the reenforcing bands of filaments, the paper stock between bands is uncoated, and may thereiore receive a subsequentlyapplied adhesive. Thus, whereit is desired to employ the reenforcing tape with the reenforcing elementstoward the box, the reenforced face of the tape may be coated with the usual gumming or water-soluble adhesive, or with other suitable adhesive. The'thinnessof the reenforcing bands of filaments is such that the tape may be caused firmly toadhere to the box .without requiring: that excessive amounts of adhesive be employed- It isalso possible to apply the adhesive to the unreenforcedface of the tape, in order that the reenforcing bands may be disposed on the outside of the tape as shown in Figs. 1 and 2. Because' of their thinness and uniform spacing, there will be no 'sacrifice in appearance in allowing the reenforcing elements to be exposect on:the exterior of the tape, nor will displacement of the bands or individual filaments occur through abrasion, in view of the saturation of the filaments by the adhesive preliminary to ap plying the ribbons or bandsto the paper stock- Accordingly,-whlchever face of the stay tape. isapplied to the corner of the carton, there results a strongly reenforced joint, well capable of resisting bursting stresses to which the box oi: carton may be subjected, yet low in cost and of slight overall thickness by reason of the single ply construction with reenorcing elements thinner than even a single average sisal fiber.. This' overall thinness of the tape approximately half the thickness of conventional reenforcedi tapesresults ingreater pliability; which in turn makes possible higher. speeds of operation of carton taping equipment. The increased pliability likewise permits improved bonding to the carton, yet with less adhesive than customarlly required.

The Construction of the invention is likewise well adapted to provide paper sheets such as wrappings and other articles having two-way reenforcement. such a sheet is illustrated in Fig. 5,',wherein the 'paper stock 22 is provided with one setof spaced bands or ribbons 24 iormed ot 'sheet in a direction substantlally transverse to the direction of the first-mentioned reenforcing elements, said filaments in said reenforcng elements in each said plurality thereof being adhesivelysecured together and to the adjacent face of said paper sheet maintaining said elements in compact thin shape. i

6. A reenforced sheet paper product compr-ising a' single paper having a plurality of reenforcing elements arranged on one face thereof in substantially parallel spaced relation, each said element consisting of a multiplicity of fine substantially continuous filaments of Organic synthetic material disposed in substantially parallel and substantially untwisted relation ina' compact thin ribbon, a second plurality of similar reenforcing elements arranged on a face of said paper sheet in a directionsubstantially transverse to the direction of the first-mentioned reenforcing elements, said laments in said reenforcng elements in each said plurality therecf being adhesively Secured together and to the adjacent face of said paper sheet maintaining said elements in compact thin shape, said paper sheet being perforated intermediate the reenforcing elements to provide a relatively open tearresistant reenforced sheet.

7. A reenforced waterproof paper comprising a single sheet of waterproof paper having a coating of waterproofing material thereon, and a plurality of reenforcing elements adhesively Secured to a surface of thepaper in spaced relation with each other, the reenforcing elements consisting of a multiplicity of fine substantially continuous and substantially untwisted filaments of Organic synthetic material disposed in substantially parallel 'elation to form compact thin ribbons, the bonding adhesive between paper and ribbons having a base similar to and compatible with the character of the waterproofing material with which the paper is coated. V

`8. A reenforced waterproof paper comprising a single sheet of waterproof paper having a latexbase coatng ofwaterproofing material thereon, and a plurality of reenforcing elements adhesively Secured to a surface of the paper in spaced relation with each other, the reeniorcing elements consisting of a multiplicity of fine substantially continuous and substantially untwisted filaments of organic synthetic material disposed in substantially parallel relation to form compact thin ribbons, the bonding adhesive between paper and ribbons having a latex base similar to and compatible with the character of the waterproofing material with which the paper is coated.

9. A stay tape comprising a single paper strip having a plurality of reenforcing elements adhesively Secured to one face thereof in substantially parallel spaced relation extending transversely of the tape, eachelement consisting'of approximately 100 to 1000 untwisted `filaments of Organic synthetic material of approximately 800 to 1650 denier, the filaments being arranged in the form of a compact thin ribbon of approximately 0.0035 inch in thickness, there being between three and six ribbons per inch of tape, the adhesive for bonding the ribbons to the paper being disposed solely at the zone of contact between ribbons and paper.

10. A reenforced bag comprsing a single sheet of paper provided with a plurality of ribbonlike reenforcing elements arranged in rows and tiers to define open spaces on said sheet, each of said ribbon-likeelements consisting of a multiplicity of fine substantially continuous filaments of organic synthetic material disposed in substantially untwisted and parallel relation to form a compact thin ribbon of substantially greater width than thickness, said filaments in each said ribbon being adhesively Secured together and to said paper sheet maintaining said ribbons in compact thin shape, and said sheet having a plurality of ventlatng apertures therein each extending through one of said open spaces.

ll. A reenforced paper product comprising a single paper web a plurality of elongatereenforcing elements overlying one surface of said webin spaced relation, each of said reenforcing elements consisting essentially of a multiplicity of fine substantially continuous and substantially untwisted organicsynthetic filaments arranged in close side by side and overlying relation to form a thin band, adhesive material substantially saturating each said band and securing said filaments therein to ,each other andtosad websurface in compact form minimizingth projection of each said band above the ,plane of-said surface, and each said band being of substantlally greater width than the maximumthickness thereof toprovide a correspondinglywide area for intimate adhesive contact between said adhesive-saturated band and said web surface;

12. A reenforced paper product comprising a single paper web, a plurality of elongate reenforci-ng elements overlying one surface of said web in spaced and substantlally parallel relation, each of said reenforcing elements consisting essentially of a multiplicity of fine substantially continuous and substantially untwisted Organic synthetic lamentsarranged in close side by side relation in a plurality of levels to form a thin band equal in thickness to the combined thickness of a plurality of said'filaments, adhesive material substantially saturating each said band to secure said bandto said web surface and to secure said ;levels .of filaments together in compact form, and each said band being of substantially greater average Width than the maximum thickness thereofto provide a correspondingly wide area for intimate adhesive contact between ?aid adhesive-saturated band and said web surace.

13. A 'eenforced paper product comprising a single paper web, a plurality of elongate reenforcing elements overlying one surface of said web in spaced and substantially parallel relation, each of said reenforcing elements consisting essentially of a multiplicity offine substantially continuous and substantially untwisted synthetic filaments arranged in close side by side and overlying relation to form a thin band, adhesive material substantially saturating each said band and securing said filaments therein to each other and to said web-surface in compact form minim'zing the projection of each said band above the plane of said surface, said adhesive material being localized within said bands and in the areas between saidbands and said web leaving the remainder of said web surface substantially free thereof, and each said band being of substantially reater width than the maximum thickness thereof .to provide a correspondingly wide area for intimate adhesive contact between said adhesive-saturated'band and said web surface.

14. A stay tape comprising a single'paper web. a plurality of elongate reenforcing elements overlying onesurface of said web and extendng transversely' of said web in spaced relation, each of said reeniorcing'. elements consisting essentially of a multiplicity of' fine 'substantially continuous and substantially untwisted Organic synthetic filaments arranged in close side by side and overlying relation to form a thin band, adhesive material substantially saturating each said band and securing said filaments therein to each other and to said web surface in compact form minimizing the projection of each said band above the plane of said surface, each said band being of substantially greater width than the maximum thickness thereof to provide a correspondingly wide area for intimate adhesive contact between said adhesive-saturated band and said web surface, and said web also having a coating of adhesive substantially covering one surface thereof.

15. A stay tape comprising a single paper web, a plurality of elongate reenforcing elements overlying one surface of said web and extending transversely of said web in spaced and substantially parallel relation, each of said reenforcing elements consisting essentially of a multiplicity of fine substantially continuous and substantially untwisted organic synthetic filaments arranged in close side by side and overlying relation to form a thin band, adhesive material substantially saturating each said band and securing said filaments therein to each other and to said web surface in compact form minimizing the projection of each said band above the plane of said surface, a coating of adhesive material overlying said web surface, each said band being of substantially greater width than the maximum thickness thereof to provide a correspondngly wide area for intimate adhesive contact between said adhesivesaturated band and said web surface, and each said band being substantially flat across at least the major portion of the surface exposed.

16. A reenforced stay tape comprising a single strip of paper, a plurality of reenforcing elements each consisting of a multiplicity of fine substantially continuous and substantially untwisted or- 40 ganic synthetic filaments forming a compact thin ribbon of substantially greater width than the thickness thereof and having arcuate exposed and flat unexposed shape, said reenforcing elements being arranged transversely at spaced intervals upon the paper, adhesive material originally drawn into the ribbon by c apillary attraction in sufficient quantity to saturate the ribbon and bondng all the filaments to one another and to the paper, the adhesive material being substantially confined to the areas of the paper covered by the ribbons and to thereby prevent displacement of the ribbons and individual filaments through abrasion, and adhesive material applied to the surface of the paper opposite the ribbons.

17. A reenforced stay tape as dened in claim 16 wherein the adhesive material bonding the reenforcing elements to the paper is a waterp-roof adhesive material having a dye incorporated therein to produce a desired color in said reenforcing elements while bonding the filaments therein together and to the paper, said adhesive material having substantally constant strength characteristics throughout the normal temperature range of use. I v ARTHUR E. CARLSON.

REFERENCES CITED The following references are of record 'in the 'file of this patent:

UNITED STATES PATENTS Number Name w Date 272323 Redlick Feb. 13, 1883 %0,697 Voss Apr. 16, 1907 1,195,430 Angier Aug. 22-,- 1916 1,679,721 Howard Aug. 7, 1928 1,866,513 Ballard July 5, 1932 2024224 Humphner Dec. 17, 1935 2,283,202 Guyard May 19, 1942 2,521,055 Foster Sept. 5, 1950 FOREIGN PATENTS Number Country Date 470558 Germany Jan. 19. 1929 105.265 Australia Sept. 22, 1938

Claims

14. A STAY TAPE COMPRISING A SINGLE PAPER WEB, A PLURALITY OF ELONGATE REENFORCING ELEMENTS OVERLYING ONE SURFACE OF SAID WEB AND EXTENDING TRANSVERSELY OF SAID WEB IN SPACED RELATION, EACH OF SAID REENFORCING ELEMENTS CONSISTING ESSENTIALLY OF A MULTIPLICITY OF FINE SUBSTANTIALLY CONTINUOUS AND SUBSTANTIALLY UNTWISTED ORGANIC SYNTHETIC FILAMENTS ARRANGED IN CLOSE SIDE BY SIDE AND OVERLYING RELATION TO FORM A THIN BAND, ADHESIVE MATERIAL SUBSTANTIALLY SATURATING EACH SAID BAND AND SECURING SAID FILAMENTS THEREIN TO EACH OTHER AND TO SAID WEB SURFACE IS COMPACT FORM MINIMIZING