JPH04256722A - Laminated paper sheet - Google Patents

Abstract

PURPOSE:To provide the laminated paper sheet and more particularly the laminated sheet which can be repetitively used for washing of kitchens, toilets, bath rooms, etc., and is suitable for cleaning and is easily usable. CONSTITUTION:A water-insoluble bonding material is applied in a network form on the laminated surfaces of the laminated sheet formed by wet sheeting of pulp alone or a mixture composed of the pulp and synthetic fibers and applying the water-insoluble bonding material in the network form on both surfaces of the laminated sheet, by which the sheets are adhered to each other.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated paper sheet, particularly an easy-to-use laminated paper sheet suitable for cleaning, which can be used repeatedly for cleaning hard surfaces such as kitchens, toilets, bathrooms, etc.

0002

[Prior art and problems to be solved by the invention] Conventionally,
When cleaning hard surfaces such as kitchens, toilets, bathrooms, etc. at home, it is often the case that a dedicated cleaning agent is used as a undiluted solution or diluted, and a rag is used as a cleaning tool for the purpose of cleaning. In the case of rags, if they are not rinsed thoroughly after use, they may emit a strange odor, which may cause problems the next time they are used.

[0003] Therefore, recently, disposable cleaning sheets using pulp have become commercially available. However, recently, resource issues and waste issues have been attracting attention.

[0004] The present invention has been made to solve these problems, and an object of the present invention is to provide a laminated paper sheet that is made of pulp sheets and is easy to use and can be used repeatedly.

[0005]

[Means for Solving the Problems] As a result of intensive research to achieve the above object, the present inventors have completed the present invention.

That is, the present invention involves laminating sheets made by wet papermaking of pulp alone or a mixture of pulp and synthetic fibers,
In addition, in a laminate sheet formed by applying a water-insoluble binding substance in a mesh pattern to both surfaces of the laminate sheet, the sheets are adhered to each other by applying a water-insoluble binding substance in a mesh pattern to the laminated surfaces of the laminate sheet. The present invention provides a laminated paper sheet characterized by:

The laminated paper sheet of the present invention has the following advantages.

(2) By applying a water-soluble binding substance to the surface of the laminated sheet in a mesh pattern, water resistance is improved and repeated use becomes possible.

[0009] By applying a water-insoluble bonding substance in a mesh pattern to the laminated surfaces between the laminated sheets and adhering them, the strength of the sheets is increased while maintaining the water and oil absorbing properties of the sheets.

The present invention will be explained in more detail below.

First, the sheet used in the present invention is as follows (a)
(a)/(b) = 90/10 of one type or two or more types of pulp selected from group and group (b), respectively.
~0/100 preferably 70/30 ~10/90
It is desirable to obtain the paper by mixing and wet paper making at a ratio of (weight ratio).

[0012] Pulp of group (a) alone has poor water absorption and oil absorption, and pulp of group (b) may be used alone, but
It is more preferable to use a mixture of the pulps of groups (a) and (b) because a bulky sheet with good water and oil absorption properties can be obtained.

(a) Softwood bleached or unbleached kraft pulp Softwood bleached or unbleached sulfite pulp Hardwood bleached or unbleached kraft pulp Hardwood bleached or unbleached sulfite pulp (b) Softwood bleached or unbleached chemi-thermomechanical pulp Hardwood bleached or unbleached Bleached chemical thermomechanical pulp Softwood bleached or unbleached kraft pulp mercerized hardwood bleached or unbleached kraft pulp mercerized softwood bleached or unbleached mechanical chemical treated pulp Hardwood bleached or unbleached mechanical chemical treated pulp Book The sheet according to the invention is preferably one obtained by further mixing synthetic fibers with the above (a)/(b) mixed pulp and wet papermaking. By mixing synthetic fibers, it is possible to obtain a sheet that is elastic even when water is absorbed, shows little fatigue even after repeated use, and has good emboss retention properties. The ratio of mixed pulp to synthetic fibers is preferably mixed pulp/synthetic fibers = 97/3 to 70/30 (weight ratio). Synthetic fibers include polyolefin,
Polyester-based and polyamide-based fibers can be used, but heat-fusible fibers and high-temperature adhesive fibers, in which part of the surface of the fibers melts when heat treated at high temperatures (e.g., 100°C or higher) and the fibers form an adhesive structure, can be used. Adhesive fibers that exhibit adhesive properties under high temperature and high humidity conditions are preferred. The basis weight of the sheet obtained by wet papermaking of pulp alone or a mixture of pulp and synthetic fibers is 10 to 100 g/m2, preferably 10 to 40 g/m2.
It is m2.

[0014] To stack the sheets, a water-insoluble binding substance is coated on one side of the sheet in a mesh pattern, and another sheet not coated with the binding substance is laminated and adhered. Even when three or more layers are laminated, they are basically laminated in the same manner as two laminated sheets are laminated. One surface and then the other surface of the laminated sheet thus obtained is coated in a reticulated pattern with the same bonding material used on the laminated surface.

[0015] The mesh shape when applying a binding substance to the sheet surface means that any point on the sheet surface where no binding substance is applied is substantially surrounded by the applied part of the binding substance in the horizontal direction of the surface. means that it is Pattern coating is best for implementation. That is, the coating pattern is not particularly limited, but it is preferable to apply the coating in, for example, a lattice (square), rhombus, or hexagonal hexagonal pattern with a width of 1 to 4 mm.

The binding substance applied to the surface of the sheet is a polymer compound that is substantially water-insoluble, such as acrylic acid lower (C1-C8) alkyl ester, methacrylic acid lower (C1-C8) alkyl ester, maleic anhydride. Acid lower (C1 to C8) alkyl esters, one type selected from these, preferably a copolymer of two or more types, or a copolymer of these with ethylene, vinyl acetate, etc., and if necessary, acrylic acid, methacrylic acid A self-crosslinking polymer compound prepared by further copolymerizing a monomer such as an acid or maleic anhydride, and more preferably a monomer such as N-methylolacrylamide or glycidyl methacrylate is preferable. The self-crosslinking type has improved water resistance because the copolymer crosslinks and becomes three-dimensional. Further, the sheet needs to maintain a soft feel even after repeated use, and for this reason it is desirable to use a bonding material with a glass transition point of 10° C. or lower.

The amount of binding substance applied to the sheet is preferably 1 to 10 g/m 2 per surface.

[0018]

Effects of the Invention The laminated paper sheet of the present invention can be used as it is or as a cleaning sheet pre-impregnated with a cleaning liquid for cleaning hard surfaces such as desks, sinks, bathtubs, etc. When cleaning a large surface, it can be rinsed with a cleaning liquid or water and then wrung out before use without reducing the ease of cleaning or the cleaning effect. Particularly when synthetic fibers are mixed, there is little wear and tear due to repeated use.

Furthermore, the laminated paper sheet according to the present invention is useful not only for cleaning, but also as a sheet for straining oil from tempura, for example.

[0020]

[Examples] The present invention will be explained below with reference to Examples, but the present invention is not limited to these Examples.

Example 1 Softwood bleached kraft pulp (NBKP) and pulp 80 obtained by mercerization of softwood bleached kraft pulp:
The pulp raw materials mixed at a ratio of 20% were made into a sheet with a basis weight of 25g/m2 using a Fourdrinier/Yankee paper machine. Wet paper strength enhancer "Kaimen 557" is used to obtain wet paper strength.
H” (manufactured by Dick Hercules Co.) to pulp 1.2
It was added to the mixed pulp raw material in a proportion of % by weight.

[0022] The raw material pulp was used unbeaten, and the crepe rate was set at 17%. The thus obtained sheet was used as a binding substance (coating agent) with a self-crosslinking acrylic binder [
Ethyl acrylate/butyl acrylate/ethyl methacrylate/N-methylol acrylamide = 75/22.
Using a 50% emulsion of 5/2/0.5 (weight ratio, glass transition point -18°C), one side was coated with a gravure coating roll with a tortoiseshell pattern, the two sheets were pasted together, and dried. . Furthermore, one side of this pasted sheet is coated with a gravure coating roll with the same tortoiseshell pattern, dried, and the other surface is similarly coated with a coating agent, dried, and embossed. provided.

The coating agent applied to the two-layered sheet was 6 g/m2 (total dry weight of the intersheet coating agent and both surface coating agents).

[0024] When the coating agent is applied between the sheets and on the sheet surface in a tortoiseshell pattern, and when the intersheet coating agent is not applied, the intersheet coating agent is applied uniformly to the entire surface instead of pattern coating. The dry tensile strength and ease of cleaning were evaluated in the following manner.

■ Dry strength Tensilon (Orientec Corpora
Sample 2.
A piece measuring 5 cm wide x 10 cm was attached to a measuring device with a distance between chucks of 5 cm, and measured at a tensile speed of 300 mm/min, and the highest value of the tensile stress was taken as the dry strength (g/2.5 cm).

■Evaluation of ease of cleaning Six panelists (female: 19, 21, 22, 27, 29, and 36 years old) conducted a practical evaluation of the ease of cleaning as a cleaning sheet.

[0027]Easy to use: 3 points Neutral: 2 points Difficult to use: 1 point.The ease of cleaning of the cleaning sheet was evaluated using the total score of 6 people.

The evaluation results are shown in Table 1.

[0029]

[Table 1]

Example 1 and Comparative Examples 1 and 2 are laminated sheets in the following cases, respectively.

(1) In Example 1, the sheets are laminated as shown in FIG. 1, and the coating agent is coated on each of the laminated sheet surface 1, adhesive surface 2, and laminated sheet back surface 3 as shown in FIG. Coated with a pattern. The pitch 4 of the hexagonal pattern in FIG. 2 is 2 mm, and the coating width 5 is 0.3 mm.

(2) In Comparative Example 1, the coating agent on the adhesive surface was applied to the entire surface.

(3) In Comparative Example 2, no coating agent was applied to the adhesive surface.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a laminated state of sheets of an example.

FIG. 2 is a schematic diagram of a hexagonal pattern to which a coating agent is applied.

[Explanation of symbols]

1 Laminated sheet surface 2 Adhesive surface 3　Laminated sheet back side 4 Pitch 5 Coating width

Claims (2)

[Claims] Claim 1: A laminated sheet comprising sheets formed by wet paper-making of pulp alone or a mixture of pulp and synthetic fibers, and a water-insoluble binding substance coated on both surfaces of the laminated sheet in a mesh pattern, the laminated sheet comprising: A laminated paper sheet characterized in that the sheets are adhered to each other by applying a water-insoluble binding substance in a mesh pattern to the laminated surfaces of the sheets. Claim 2: The water-insoluble binding substance has a glass transition point of 1.
The laminated paper sheet according to claim 1, which is a self-crosslinking adhesive having a temperature of 0° C. or lower.