JPH0316850B2 - - Google Patents

Description

Claim 1: (a) consisting of fibers having a predominant length of less than 1/4 inch and having a binder treated therein in a finely spaced pattern, the binder treatment being finely creped; (b) an inner core region comprised of fibers having a predominant length of less than 1/4 inch and having a generally lower fiber concentration than the strong surface area; (c) a predominant length of less than 1/4 inch; a second strong region having a higher fiber concentration than the inner core region and having a binder treated therein in a finely spaced pattern to bond the fibers into a strong network; The binder in the second strong region is not substantially connected to the binder in the strong surface region and many of the fibers in the inner core region adjacent to the first strong surface region and the second strong region are either papermaking bonds or binders. (d) connected to the fibers in the first strong surface region or the second strong surface region by either; A reinforcing layer consisting of a web of fibrous material having a minimum wet tensile strength of 16 oz/in and having substantially no pores larger than 0.02 square inches. 2 and (a) a third fiber comprising fibers having a predominant length of less than 1/4 inch and having a binder treated therein in a finely spaced pattern to bond the fibers into a strong network; (b) a second inner core region comprised of fibers having a predominant length of less than 1/4 inch and having a generally lower fiber concentration than the third strong region; and (c) a predominant length of less than 1/4 inch. a second strong surface region comprising lengths of fibers and having a binder treated therein in a finely spaced pattern, the binder treated portions being finely creped; The binder is generally not connected to the binder in the third strong region of the fibers and most of the fibers in the second inner core region adjacent to the second strong surface region and the third strong region are either papermaking bonds or binders. 2. The multilayer wipe of claim 1, wherein the fibers are connected to the fibers in the second strong surface region or the third strong surface region. 3, and (a) having a minimum wet tensile strength in any direction of about 16 oz/in and having substantially pores larger than 0.02 square inches bonded to the exterior surface of the first strong region; 2. The multilayer wipe of claim 1, comprising: a second reinforcing layer consisting of a web of non-woven fibrous material. 4. The multilayer wipe of claim 1, wherein the binder on the surface of the second strong region adjacent to the reinforcing layer is finely creped. 5. The multilayer wipe of claim 1 or claim 4, wherein the binder on the outer surface of the strong surface region accounts for about 15 to about 60% of the surface area of the wipe. 6. The multilayer wipe of claim 1, wherein the binder in the second strength region accounts for about 15 to about 60% of the surface area of the wipe. 7. The multilayer wipe of claim 5, wherein the binder in the second strength region accounts for about 15 to about 60% of the surface area of the wipe. 8. The multilayer wipe of claim 3, wherein the binder on the surface of the second strong region adjacent to the reinforcing layer is finely creped. 9. The multilayer wipe of claim 3 or 8, wherein the binder on the outer surface of the strong surface region accounts for about 15 to about 60% of the surface area of the wipe. 10. The multilayer wipe of claim 3, wherein the binder in the second strength region accounts for about 15 to about 60% of the surface area of the wipe. 11. The multilayer wipe of claim 9, wherein the binder in the second strength region accounts for about 15 to about 60% of the surface area of the wipe. 12. The multilayer wipe of claim 2, wherein the binder on the surfaces of the second and third strong regions adjacent to the reinforcing layer is finely creped. 13. The multilayer wipe of claim 2 or 12, wherein the binder on the outer surface of both strong surface regions accounts for about 15 to about 60% of the surface area of the wipe. 14. The binder in the second and third strong regions accounts for about 15 to about 60% of the surface area of the wipe;
A multilayer wipe according to claim 2. 15. The binder in the second and third strong regions accounts for about 15 to about 60% of the surface area of the wipe.
The multilayer wipe of claim 13. 16 (a) applying a binder to one side of a web of fibers having a predominant length of less than 1/4 inch so as to penetrate from about 10 to about 60% into the web; (b) to the other side of the web; The bonding agent is applied in a finely spaced pattern covering about 15 to about 60% of the surface area on one side, penetrating about 10 to about 60% of the web thickness, but not substantially continuous with the bonding agent on one side. (c) crepe the web from the creping surface by bringing the bonding treatment on the other side of the web into close contact with the creping surface; and (d) crepe the web from the creping surface by bringing the bonding treatment on the other side of the web into close contact with the creping surface; and (d) crepe the web from the creping surface; A method of making a multilayer wipe comprising adhering a reinforcing web of fibrous material having a minimum wet tensile strength of 16 oz/in and having substantially no pores larger than 0.02 square inches. 17 Additionally, on the surface of the other side of the web, a fibrous material having a minimum wet tensile strength of about 16 oz/in measured in any direction and having substantially no pores larger than 0.02 square inches; 17. The method of manufacturing a multilayer wipe according to claim 16, comprising the step of adhering a second reinforcing web. 18 Further (a) repeating steps (a), (b) and (c) for a second web of fibers having a major length of less than 1/4 inch; (b) repeating steps (a) on one side of the second web; 17. A method of manufacturing a multilayer wipe according to claim 16, comprising the step of adhering to a reinforcing web. 19. The method for producing a multilayer wiping material according to claim 16, further comprising the step of bringing the bonded portion on one side of the web into close contact with the creping surface and creping the web from the creping surface. 20. The method of manufacturing a multilayer wipe of claim 16 or 19, further comprising the step of mechanically softening the multilayer wipe. 21. The method of claim 20, wherein the mechanical softening step is carried out by perf-embossing the multilayer wipe. 22 Additionally, on the surface of the other side of the web, a fibrous material having a minimum wet tensile strength of about 16 oz/in measured in any direction and having substantially no pores larger than 0.02 in. 20. The method of manufacturing a multilayer wipe according to claim 19, comprising the step of adhering a second reinforcing web. 23. The method of manufacturing a multilayer wipe according to claim 17 or 22, further comprising the step of mechanically softening the multilayer wipe. 24. The method of claim 23, wherein the mechanical softening step is carried out by perf-embossing the multilayer wipe. 25 Additionally, (a) repeat steps (a), (b) and (c) for a second web of fibers having a major length of less than 1/4 inch; (b) on one side of the second web; 20. The multilayer wipe of claim 19, comprising the steps of: bringing a bonding treatment into intimate contact with the creping surface to crepe the web from the creping surface; and (c) adhering said one side of the second web to a reinforcing web. Method of manufacturing wood. 26. The method of manufacturing a multilayer wipe of claim 18 or 25, further comprising the step of mechanically softening the multilayer wipe. 27. The method of making a multilayer wipe of claim 21, wherein the mechanical softening step is carried out by perf-embossing the multilayer wipe. TECHNICAL FIELD This invention relates generally to disposable laminated web structures suitable for use as cloth towel replacements and methods of making the same. More particularly, the present invention relates to laminated web structures in which a very light and relatively strong reinforcing web is adhesively bonded to one or two layers of fibrous web made primarily from papermaking fibers. BACKGROUND OF THE INVENTION The prior art discloses that fibrous webs made primarily from papermaking fibers can be reinforced to create laminated web structures suitable for use as heavy-duty wipes. This is generally accomplished by adhering a reinforcing layer to one or more layers of a uniform density web, such as tissue paper. An example of a conventional laminated structure using tissue paper layers is disclosed in Kyamden U.S. Pat. It is heavily impregnated with granular soft sticky non-migrating binder solids. Thomas U.S. Pat. No. 3,709,764 discloses a laminated wipe in which one or more cellulosic tissue layers are disposed between outer scrim layers. The laminated wipe construction disclosed in Kemp U.S. Pat. No. 3,953,638 consists of a relatively stretchable central layer of cellulosic tissue reinforced by imprinting on each side a discontinuous pattern of a suitable polymeric resin. It includes. The outer layer of the wipe is a highly extensible creped cellulosic tissue paper that is intermittently adhered to the surface of the reinforced core layer. No. 3,879,257 to Dientile et al., assigned to the assignee of the present invention, discloses a soft absorbent central core region with a relatively low fiber concentration sandwiched between two strong, abrasion resistant surface regions with a high fiber concentration. A single layer fibrous web having a laminate-like structure is disclosed. This surface area contains a bonding agent to provide strength, and the bonding treatment on at least one surface area is finely creped. The Dientyle et al. patent also discloses a method of making a laminate-like web from a prefabricated fibrous web, which method involves applying a binder to one side of the web within the thickness of the web from about 10 to about
Apply the bonding agent in a finely spaced pattern on the other side of the web to approximately 60% penetration within the web thickness.
~60% penetration but not substantially connected to the first binder, the other side of the web is brought into close contact with the creping surface by means of the binder, and the web is creped from the creping surface. including the step of causing 2 prepared according to the above patent of Dientyle et al.
It is also known to form laminated web structures by laminating stranded scrims between sheets of fibrous webs. The spacing of the scrim strands results in holes of approximately 0.079 square inches. These relatively large unreinforced areas are susceptible to fracture and do not impart acceptable abrasion resistance to the entire wipe surface, rendering the laminate structure unsuitable for use as a heavy-duty wipe. U.S. Pat. No. 2,834,809 to Schütte et al. discloses a method of mechanically processing a fibrous web to make it absorbent and conformable, a process known as perf-embossing. In this method, the web is passed between the nips of two rolls, and the surface of each roll is made up of a number of depressions and depressions arranged so that the protrusions on each roll engage with the corresponding depressions on the other roll. It is configured.
As the fibrous web passes between the nips of two rolls, the web is partially compressed and the area between the compressed areas is stretched beyond the elastic limits of the fibers or interfiber bonds, resulting in fiber separation. occurs and the porosity of the web increases. In some cases, if the tensile strength of the paper is exceeded, holes will form in the web. Schütte et al. acknowledge that multilayer webs can be mechanically processed by this method. SUMMARY OF THE INVENTION In accordance with the present invention, fibers having a predominant length of less than 1/4 inch have a binder treated therein in a finely spaced pattern, the binder treatment being finely creped. A laminated wipe is provided having a strong surface area. The wipe also has an inner core region comprised of fibers having a predominant length of less than 1/4 inch and having a lower fiber concentration than the surface region. The wipe has a higher fiber concentration than the inner core region, consisting of fibers having a primary length of less than 1/4 inch, and a finely spaced pattern therein to bond the fibers into a strong network. a second strong region having a binder treated with a binder, provided that the binder in the second strong region is not substantially connected to the binder in the strong surface region. and the wipe has a minimum wet tensile strength of about 16 oz/in in any direction bonded to the exterior surface of the second strong region and substantially eliminates pores larger than 0.02 square inches. It is reinforced by a reinforcing layer consisting of a web of fibrous material without any fibrous materials. The wipe in another embodiment of the invention further comprises fibers having a predominant length of less than 1/4 inch and having a finely spaced pattern treated therein to bond the fibers into a strong network. a second inner core region comprising fibers having a predominant length of less than 1/4 inch and having a generally lower fiber concentration than the third strength region; and a second strong surface region consisting of fibers having a main length and having a binder treated therein in a finely spaced pattern, the binder treatment being finely creped; The binder in the region is generally not connected to the binder in the third strong region of the fibers and many of the fibers in the second inner core region adjacent to the second strong surface region and the third strong region are papermaking bonded or bonded. connected to the fibers in the second strong surface region or in the third strong surface region by either an agent. In yet another aspect of the invention, the wipe has a minimum wet tensile strength of about 16 oz/in in any direction bonded to the outer surface of the first strong region and less than 0.02 oz/in. a second web of fibrous material substantially free of large pores;
It is also possible to have a reinforcing layer. According to the method of the present invention, the multilayer wipe is (a)1/
About 10 to about 60% of the binder within the web on one side of the web consisting of fibers with a main length of less than 4 inches
(b) apply the bonding agent in a finely spaced pattern covering about 15 to about 60% of the surface area on the other side of the web, penetrating about 10 to about 60% of the surface area of the web; (c) creping the web from the creping surface by bringing the other bonded portion of the web into close contact with the creping surface; and (d) creping the web from the creping surface; by adhering to the surface of the material a reinforcing web of fibrous material having a minimum wet tensile strength of approximately 16 oz/in measured in any direction and having substantially no pores larger than 0.02 square inches. It is made by A multilayer wipe in another aspect of the invention comprises:
a second reinforcement on the surface of the other side of the web of a fibrous material having a minimum wet tensile strength of about 16 oz/in measured in any direction and having substantially no pores larger than 0.02 square inches; It can be made by gluing webs together. In yet another aspect of the invention, the multilayer wipe further comprises steps (a), (b), and (c) for a second web of fibers having a predominant length of less than 1/4 inch.
This can be produced by repeating; and then adhering the above-mentioned one side of the second web to the reinforcing web.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a laminated web structure; FIG. 2 is a schematic cross-sectional view of another laminated web structure; FIG. 3 is a schematic cross-sectional view of yet another laminated web structure; FIG. 4 is a block flow diagram of a method for producing the web of FIG. 1; FIG. 5 is a block flow diagram of a method for producing the web of FIG. 1; FIG. and FIG. 6 is a block flow diagram of the additional steps that, when added to some of the steps in the method of FIG. 4, produce the web of FIG. 3. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 schematically depicts a cross-sectional view of a multilayer web structure 10 made in accordance with the present invention. The web 10 is comprised of a surface fibrous layer 12, an inner fibrous layer 14 adjacent the surface layer 12, a second inner fibrous layer 16 adjacent the inner layer 14, and a fibrous reinforcing layer 18 adjacent the inner layer 16. Surface fiber layer 12 is reinforced by applying an adhesive bonding agent to surface 11 of layer 12 in a finely spaced pattern. The inner layer 14 consists of fibers loosely bound together by papermaking bonds. The fiber density of the inner layer 14 is generally lower than the fiber density of the reinforced surface layer 12. Layer 12 because many of the fibers in inner layer 14 adjacent reinforcing surface layer 12 are connected to fibers in surface layer 12, either by paper bonding or by adhesive bonding in surface layer 12. Unity is imparted between and 14. Inner fibrous layer 16 is also reinforced by applying an adhesive bonding agent to the surface of layer 16 in a finely spaced pattern. The fiber density of reinforcing layer 16 is generally higher than the fiber density of inner layer 14. Reinforcement layer 1
Because many of the fibers in inner layer 14 adjacent to layer 6 are connected to fibers in surface layer 12, either by paper bonding or by adhesive bonding in reinforcing layer 16, layers 14 and 16 It gives a sense of unity between people. The reinforcing layer 18 is adhered to the surface 17 of the reinforcing layer 16 by suitable means, such as an adhesive bond. In a preferred embodiment, surface 11 of layer 12
The binder on either surface 17 of layer 16 is softened by finely creping the surface. In the most preferred embodiment, the binder on both surfaces 11 and 17 is finely creped. In the web structure of FIG. 1, the reinforced surface fiber layer 12 combined with the lower density inner layer 14 provides the web 10 with a balance of good abrasion resistance with absorbency and flexibility. Since the binder in the reinforced surface layer 12 is applied in a finely spaced pattern, there will be some tendency to shed fibers when the surface is used for wiping operations. In such cases, the reinforcing layer 18 not only provides overall strength and fracture resistance to the web 10, but also provides high abrasion resistance to the surface of the web 10, reducing absorbency but not producing lint. Give. FIG. 2 schematically represents a cross-sectional view of another web structure 20 made in accordance with the present invention. layer 1
2a, 14a, 16a and 18a are of the same construction as layers 12, 14, 16 and 18, respectively, of FIG. The second reinforcing layer 22 is applied to the surface 11 of the reinforcing layer 12a by any suitable means, such as an adhesive bond.
It is glued to a. The web 20 in FIG. 2 has two outer reinforcing layers 18a.
and 22, it is suitable for applications where both surfaces need to be highly resistant and relatively free from fiber waste. The relatively low density inner fibrous region 14a not only contributes to the web's improved absorbent properties, but also contributes to the web 20 having better drapability than if the layer were not present. FIG. 3 schematically represents a cross-sectional view of another web structure 30 made in accordance with the present invention. Layers 12b, 14b, 16b and 18b are of the same construction as layers 12, 14, 16 and 18 of FIG. In addition to layers 12b, 14b, 16b, and 18b, web 30 includes a third inner fibrous layer 32 adjacent reinforcing layer 18b, a fourth inner fibrous layer 34 adjacent layer 32, and a third surface fibrous layer adjacent layer 34. layer 3
Includes 6. Surface fiber layer 36 is also reinforced by applying a binder to surface 37 of layer 36 in a finely spaced pattern. The inner layer 34 also consists of fibers loosely bonded by papermaking bonds. Like layer 14b, the fiber density of inner layer 34 is generally lower than the fiber density of reinforced surface layer 36. Many of the fibers in the inner layer 34 adjacent to the reinforced surface layer 36 are connected to the fibers in the surface layer 36, either by papermaking bonds or by adhesive bonding agents used to strengthen the surface layer 36. This provides cohesiveness between layers 34 and 36. Inner fibrous layer 32 is also reinforced by applying adhesive to surface 31 of layer 32 in a finely spaced pattern. The fiber density of the reinforcing layer 32 is generally that of the inner layer 3.
Higher fiber density than No. 4. Because many of the fibers in inner layer 34 adjacent reinforcing layer 32 are connected to fibers in reinforcing layer 32, either by paper bonding or by adhesive bonding in reinforcing layer 32, layer 3
Unity between 2 and 34 is given. Surface 31 is adhered to reinforcing layer 18b by any suitable means, such as an adhesive bond. The web 30 in FIG. 3 has two low-density inner layers 14.
The two reinforced surface layers 12b, 36 of fibers combined with fibers 12b, 34 provide a web 30 with a balance of abrasion resistance with absorbency, flexibility and drapability. The reinforcing layer 18b is the web 3
0 with total strength and fracture resistance. In the preferred embodiment of FIGS. 1-3, all fiber layers other than reinforcing layers 18, 18a, 18b and 22 are short fibers less than 1/4 inch in length, such as papermaking wood pulp or cotton linter. It is preferable that the fiber is mainly composed of lignocellulose fibers such as lignocellulose fibers. However, the web may be made partially or entirely of relatively long fibers and still retain the advantages of the present invention. Examples of such relatively long fibers are cotton, wood,
Natural or synthetic fibers such as rayon, regenerated cellulose, cellulose ester fibers, such as cellulose acetate fibers, polyamide fibers, acrylic fibers, polyester fibers, vinyl fibers, protein fibers, fluorocarbon fibers, dinitrile fibers, and nitrile fibers. These other fiber lengths may be as long as about 2 1/2 inches, although shorter lengths are advantageous for making webs on conventional papermaking equipment.
The use of at least 50% papermaking fibers is particularly advantageous for economic and other reasons. It is also particularly advantageous to have the fibers not aligned but randomly oriented. The pattern of binder applied to the web may be in the form of fine lines or areas on either side, but always on one side, so as to leave a significant portion of the surface of the web free of binder. must be. The preferred pattern is that the binder is approximately 15% of the total surface area of the web in the final web product.
~60% of each surface of the web ~40%~85% of each surface of the web
% should be such that % remains free of binder. It has been found that when the web consists primarily of papermaking fibers, it is particularly desirable to apply the binder in a streak pattern so that the binder forms a strong reticulated web through the surface of the web. did. It is well known that papermaking fibers generally have a length of less than about 1/4 inch and usually have a main fiber length of less than about 1/16 inch. Thus, if strength is to be imparted to the sheet primarily by the binder instead of by the interfiber bonds conventionally used in papermaking, there is at least some continuous interconnection of fibers by the binder throughout the web. This is very important. When the pattern of binder is in the form of parallel lines, bars, or other discrete areas, the web lacks substantial strength unless such discrete areas are spaced apart by less than the average fiber length. However, if the adhesive bond pattern is in the form of streaks or nets,
The interconnecting lines of binder provide a network of strength even where significant areas between the lines of binder application are defined as unbonded treated web sections. The reinforcing layers 18, 18a, 18b and 22 of FIGS. 1, 2 and 3, respectively, are materials with good drapability, are strong, and do not have large openings lacking reinforcing fibers. In particular, reinforcement layers 18, 18a, 18b, and 22 have a minimum moisture content (water) of approximately 16 oz/in measured in any direction.
It should have tensile strength. Also, as a measure of drapability, reinforcing layers 18, 18a, 18b and 22 should have a bending stiffness in the range of about 10 to about 25 as measured in accordance with ASTM D1388-75, Volume 32. In a preferred embodiment,
The reinforcing layer is a randomly deposited spunbond nonwoven. One preferred reinforcing material is a spunbond nylon web having a basis weight of 0.4 oz/sq yd, sold under the trademark "Selex" and manufactured by Monsanto Textile Company, 800 North Lindbergh Boulevard, St. , MO63166). FIG. 4 is a flowchart of a method for making the wiping material shown in FIG. As shown in FIG. 4, the method is shown to begin by processing a roll of base paper 60; Those skilled in the art will appreciate that one can also begin by treating a web such as that made on a paper machine such as that described in US Pat. No. 3,879,257. Base paper 60 is processed in step 62 by applying a binder into one surface of the web. Although the binder may be applied to the entire surface of the web, it is preferably applied in a finely spaced pattern to the surface of the web.
Penetration of the binder into the web occurs after the creping process, represented by block 68, within the thickness of the web from about 10 to about
Controlled to spread to 60%. The step 62 of applying a binder to one surface of the web 60 is followed by a step 64 of causing the web to adhere to the creping surface by the binder applied to the one surface of the web 60 to crepe the web from the creping surface. is preferred. After applying the binder to one surface, a binder is applied to the other surface of the web 60, as represented by step 66. As in step 62, the binder may be applied to the entire web surface, but is preferably applied in a finely spaced pattern to the web surface. Penetration of the binder into the web is controlled so that it extends from about 10 to about 60% within the web thickness but does not substantially connect with the binder applied in step 62. After step 66 of applying a binder to the other surface of the web 60, the binder applied to the other surface of the web 60 causes the web 60 to adhere to the creping surface to crepe the web from the creping surface. It is preferable to perform 68. After the final creping step, the treated web 60
It is desirable to wind up the wipes into mother rolls 70 and 72 to complete the manufacture of the wipe product at a separate location. Alternatively, the treated web 60 can proceed directly to the next step 78 in which the reinforcing layer unwound from the roll 76 is laminated. Lamination process 78
The adhesive formulation in Union Carbide
"UCAR 878" available from The Corporation (270 Park Avenue, New York, NY 10017) was mixed with 6% of the crosslinker rubber "Shimel 303" available from American Cyanamid Company (Wine, NJ 07470). This adhesive has a 90 mil diamond pattern with lines 0.012 inches wide and 94.3 microns deep.
Reinforcement layer 76 by a gravure roll having a diameter of 60 mils (long dimension aligned in the longitudinal direction of the web)
printed on the surface. The adhesive-printed surface of reinforcing layer 76 is brought into contact with the surface of web 60, and then the combined web is heated, e.g.
Dry by passing through a Yankee dryer at a temperature of ~325°. To cure the laminating adhesive, the web is further heated, for example by an air dryer, to a temperature of 430-450°C. Although the application of the adhesive used to laminate reinforcing layer 76 to web 72 was done in a continuous diamond pattern, other patterns could be used;
It will be clear to those skilled in the art that this may in fact be preferred. For example, application of the adhesive in a pattern of spaced spots is believed to result in a web having better drapability than a web laminated with a continuous pattern of adhesive. The laminated structure after lamination step 78 is generally that depicted in FIG. The laminated wipe structure resulting from lamination step 78 may be relatively stiff compared to cloth wipes. If so, the laminated wipe structure is passed through a mechanical softening step 82, such as microcreping, embossing, or perf-embossing. A preferred method of mechanical softening step 82 is to perf-emboss the laminate structure in accordance with Schütte et al. US Pat. No. 2,834,809. After the mechanical softening step 80, the laminated wipe structure may be rolled up into a mother roll 84 and later converted into individual wipe packages. FIG. 5 is a block flow diagram of additional steps that, when performed after lamination step 78 of FIG. 4, result in the laminated wipe of FIG. 2. As indicated by dashed line 80, the laminated wipe structure resulting from lamination step 78 is sent to a secondary lamination step 88 where the laminated structure produced from lamination step 78 is unreinforced. A second reinforcing web 86 is adhered to the surface. The bonding process 88 is the bonding process 7 in FIG.
It is substantially the same as 8. The laminated web structure resulting from lamination step 88 has the structure shown in FIG. In a preferred method of manufacturing the laminated wipe structure of FIG. 2, the laminated web structure is subjected to a mechanical softening step 90 that is substantially the same as mechanical softening step 82 of FIG. The mechanically softened wipes are wound onto a mother roll 92 and later converted into packages of wipes. FIG. 6 is a block flow diagram of additional steps that, when performed after the creping step of FIG. 4, result in the laminated wipe of FIG. 3. In a preferred method, webs 70, 72 and 76 are connected as indicated by dashed lines 71, 73 and 75.
are laminated together in a single-stage lamination step 94. This is done by placing the reinforcing web 76 in contact with one surface of the web 72, and applying an adhesive as described in the bonding step 78 in FIG. 5 to the surface of the reinforcing web 76 that is not in contact with the web 72. , and then by contacting a second web 70 with a surface of web 76 that is not in contact with web 72. The laminated web structure is then dried and cured as described in connection with lamination step 78 of FIG. The laminated web structure resulting from lamination step 94 is the structure depicted in FIG. However, it is preferred to perform a mechanical softening step 96 that is substantially the same as the mechanical softening step of FIG. The mechanically softened laminated wipes can be wound onto a mother roll 98 for later conversion into packages of individual wipes. In the method generally depicted in FIGS. 4-6, mechanical softening steps 82, 90 and 96
are shown to be placed after the corresponding lamination steps 78, 88 and 94. Applicant contemplates that the mechanical softening steps 82, 90 and 96 can also occur immediately after the secondary creping step 68 of FIG. In discussing Figures 4-6, it is also indicated that the mechanical softening step is optional. As a general indicator, if the bending stiffness of the wipe after the lamination process is greater than 600, it is desirable to perform a mechanical softening process. The web structures of Figures 1-3 generally have final basis weights of 30 lb/ream (2880 square feet) for the low end and 110 lb/ream for the high end;
The preferred range is 65 to 95 pounds/ream. Example 1 Example 1 is a strong wipe having the structure of FIG. 3 manufactured according to FIGS. 4 and 6. Base web 60 was conventionally manufactured on conventional papermaking equipment from a pulp slurry of bleached Northeastern softwood kraft fibers with the addition of RYCO 637 to reduce interfiber bonding. This web was placed in close contact with a Yankee dryer and then creped. The nominal physical properties of Base Web 60 were as follows: Basis Weight 31.0 lbs. CD) Tensile strength 11 oz/inch Both surfaces of the base web 60 are
2, 64, 66, and 68. The binder applied to the surface of the web is "A-105" with a solids content of 10 to 18 pounds/ream.
(Air Products & Chemical Co., PO Box)
538, Allentown, PA 18105), "A-105" up to 0.5 part ammonium chloride per 100 parts solids, "A-105"
-105'' up to 0.5 parts per 100 parts solids of Formaster VF (Diamond Shamrock Corporation, 350 Mount Kemble Avenue, Moristan, NJ 07960), and ``A-
105" up to 0.5 part of "Natrosol" per 100 parts of solid content
(Hercules Corporation, Wilmington, DE). This bonding agent has a 90 mil x 60 mil diamond pattern (diamond line width is 9.4 to 10.8 mil,
The line depth is 68-76 microns) printed on the surface by a gravure roll. After the second creping step 68, the web has a basis weight of 0.3
oz/sq. yd spunbond nylon web "Serex" (Monsanto Textiles, Inc., 800 North Lindbergh Boulevard, St. Louis, MO 63166). The adhesive formulation and method of application were as described in the description of lamination step 78 in FIG.
After lamination, the wipe structure is perf-embossed in accordance with the Schutzte et al. patent.
Perf-embossing is performed by passing the laminated wipe structure between two rolls having identical knuckle patterns. The cross-section of each nutacle is a hexagonal shape that is elongated in the machine direction (MD), with two parallel long sides of 0.052 inch extending vertically and a 0.021 inch long side extending at a 45 degree angle with the long sides.
It has two pairs of parallel sides of inches. The knuckles on each roll are arranged longitudinally with a knuckle-to-knuckle spacing of 0.144 inches, and adjacent knuckles are arranged with a knuckle-to-knuckle spacing of 0.11 inches along a line at 45 degrees to the longitudinal direction of the roll. is offset at an angle of 45 degrees to the lateral direction of the roll. The nuts of the two rolls are interlocked so that they overlap to a depth of 0.031 inch. The resulting laminated wipe has the following properties:

[Table] The complete tear test procedure is described in TAPPI T414 ts-65. Müllen burst test procedure is TAPPI T403 Os−
76. Bending stiffness is ASTM D1388-75 volume 32
Measured according to Taber Abrasion Test ASTM 1175, Rotary Platform, Double Head, Section
Listed at 41.3, 1/4 inch diameter breaking point. Example 2 Example 2 is a heavy-duty wipe made in the same manner as the wipe of Example 1, except that the reinforcing layer is SELEX spunbond nylon web having a basis weight of 0.4 ounces/square yard. The resulting laminated wipe has the following properties:

[Table] Example 3 Example 3 was a high-strength wipe made using the same technique as Example 2, except that the knuckle overlap in the perf-embossing process was reduced to 0.011 inches to lower the mechanical softening of the laminated wipe. It is a wiping material. The resulting laminated wipe has the following properties:

[Table] Example 4 The base sheet of Example 4 was made in essentially the same manner and on the same papermaking machine as the base sheets of Examples 1, 2, and 3, except that the basis weight was increased to a nominal 45 ounces/2880 square feet. be done. Other nominal physical properties of this base web are as follows: Bulk 270 mils/24 sheets MD Tensile 280 oz/in MD Elongation 6% CD Tensile 17 oz/in Both surfaces of this base web material were coated on a gravure roll. It is bonded and creped in the same manner as the base web materials of Examples 1, 2 and 3, except that the line width of the pattern is 9.4-11.7 mils and the line depth is 68-94 microns. The bonded and creped base web has a nominal basis weight of 57
lb/2880 square feet. After the second creping step, this treated base web material was prepared with a basis weight of 0.4 by the method, adhesive type and amount described in the lamination step description in FIG.
Glue to oz/sq yd "SELEX" web. Then, the laminated web structure was prepared in Example 1.
Mechanically softened by perf-embossing in the same manner as. The resulting laminated wipe has the following properties:

[Table] Example 5 The non-reinforced surface of the laminated structure of Example 4 was perforated.
Prior to embossing, a 0.4 oz./sq. yd.
A second reinforcing layer of spunbond nylon is adhered. The laminate structure is then subjected to the same perf-embossing used for softening in Example 4. The resulting laminated wipe has the following properties:

【table】