JPH0449932A - Laminated sheet like cleaning article - Google Patents

Abstract

PURPOSE:To prevent the separation of an outer layer sheet and an inner sheet layer during a cleaning operation by providing difference in the content of binder between front and back faces of the outer layer sheet and providing the face of the outer layer sheet having the higher content of binder on the face of the inner layer sheet side. CONSTITUTION:Fibers constituting a sheet used for a laminated sheet cleaning article include wooden pulp fibers, non-wooden plant fibers, synthetic fibers such as rayon fibers, polyester fibers. The sheet is obtained by papering these fibers according to a normal method such as a wet type, a dry type. The quantity of the sheet used for an inner layer sheet suitably ranges from 5 to 100g/m<2> and that for an outer layer sheet suitably ranges from 5 to 50g/m<2> from the viewpoint of strength and flexibility of sheet during cleaning. The content ratio of binder of a face with high content of binder and a face with low content of binder preferably ranges from 1.1/1 to 2.5/1. The quantity of binder used relative to the dry weight of the outer layer sheet ranges from 1 to 30%. A laminated sheet cleaning article is obtained by providing faces with the higher content of binder of the outer layer sheets on the inner layer sheet sides, laminating them on both the faces of one or more inner layer sheets and applying an embossing work.

Description

[Detailed description of the invention] [Industrial application field] FIELD OF THE INVENTION The present invention relates to laminated sheet cleaning articles.

[Conventional technology and its problems]

Paper towels are useful for cleaning hard surfaces in the living room, kitchen, toilet, etc., and for wiping hands, buttocks, etc.
Sheet-like cleaning products such as sanitary tissues are used.

Most of these sheet-like cleaning products are made by laminating multiple thin sheets to have an appropriate thickness for wiping the surface to be cleaned, and the surface to be cleaned, that is, the outer layer, is made to have the strength to withstand cleaning work. It is made by spraying or coating the outer surface of the sheet with a binder, and then embossing it to join multiple laminated sheets together.

The laminated sheet-like cleaning article produced in this way can be used as is or after being impregnated with a cleaning agent, a disinfectant, etc.

In addition to the role of joining the laminated sheets together, embossing gives the laminated sheets a desirable bulk and soft texture, and also provides a slippery effect when wiping the surface to be cleaned.

These laminated sheet-like cleaning articles are stacked or folded and stacked to form a product in a plastic container, bag, or the like.

In such products, when unfolding a folded article into a single sheet or during cleaning work, the sheets joined by the embossing may peel off.

In particular, such problems often occur in products in which flushable sheet-like cleaning products using water-soluble binders are impregnated with cleaning agents having a high water content.

[Means to solve the problem]

As a result of intensive research by the present inventors to solve the above problem,
The inventors have discovered that this problem is related to the amount of binder present on the front and back sides of the outer layer sheet, and that it can be solved if the amount of binder on the inner layer sheet side is greater than the amount of binder on the outside surface, and has completed the present invention. reached.

That is, the present invention provides a laminated sheet-like cleaning article obtained by laminating and embossing an outer layer sheet and an inner layer sheet, by providing a difference in the binder content on both the front and back surfaces of the outer layer sheet, and increasing the binder content on the high binder content side of the outer layer sheet. The object of the present invention is to provide a laminated sheet-like cleaning article characterized in that the cleaning article is disposed on the inner layer sheet side.

The fibers constituting the sheet used in the laminated sheet-like cleaning article of the present invention are not particularly limited, and include, for example, synthetic fibers such as wood bulb fibers, non-wood plant fibers, rayon fibers, and polyester fibers. The sheet is obtained by paper-making these fibers by a conventional method such as a wet method or a dry method.

The basis weight of the sheet used in the present invention is 5 to 100 g/rr for the sheet used for the inner layer. , 5~ for the sheet used for the outer layer
A range of 50 g/rrf is suitable from the viewpoint of sheet strength during cleaning and sheet flexibility, but more preferably 15 to 5
An inner layer sheet with a weight of 0 g/rd and an outer layer sheet with a weight of 10 to 40 g/rd are used.

Methods of changing the binder content on the front and back sides of the outer layer sheet include spraying the binder on one side of the sheet during paper making, and coating it on one side of the sheet with a coating roll.
It depends on the method of drying, but is not limited to this method.

The binder content ratio between the high binder content side and the low binder content side of the outer layer sheet is 1.1/1 to 2.5/1, especially 1.2/1 to
Preferably it is 2/1.

The binder used for the outer layer sheet is not particularly limited as long as it exhibits strength suitable for cleaning work.

Examples of the water-insoluble binder (wet paper strength enhancer) include polyamide polyamine-epichlorohydrin resin, polyacrylamide, polyamine resin, polyethyleneimine, dialdehyde starch, and the like.

Examples of water-soluble binders include polyvinyl alcohol, polysaccharide derivatives (alkali metal salts such as carboxymethyl cellulose, carboxyethyl cellulose, and carboxymethylated starch), synthetic polymers (polyacrylic acid, polymethacrylic acid, acrylic acid-methacrylic acid copolymers, Alkali metal salts such as copolymers of acrylic acid or methacrylic acid and acrylic acid alkyl esters and methacrylic acid alkyl esters), natural polymers (glue, casein, guar gum,
xanthan gum, gellan gum, taracanth gum, pectin), etc.

Further, a cross-linked binder with a certain type of inorganic salt (a water-soluble binder that is insoluble in a small amount of water but becomes water-soluble in a large amount of water) can also be used. Application methods for this type of binder include spraying or coating the sheet with a binder that has been crosslinked with an inorganic salt, or, in wet cleaning article embodiments, spraying or coating the sheet with only the uncrosslinked binder. There is a method in which an inorganic salt capable of crosslinking the binder is added to the liquid active substance that is coated and later impregnated with the binder. Specific examples of such cross-linked binders include metal salts of anionic binders (calcium salts of carboxymethylcellulose, zinc salts of carboxymethylcellulose, iron salts of carboxymethylcellulose, calcium salts of acrylic acid, etc.), binders with hydroxyl groups, and Acid or its salt (
polyvinyl alcohol-boric acid or its salt), etc.

The amount of binder is 1 to 3 based on the dry weight of the outer layer sheet.
0%, preferably 1-15%, more preferably 1-10
Used in a range of %.

The sheet used for the inner layer is not particularly limited as long as it gives a sense of thickness during cleaning, and a binder-free sheet that does not use a binder or a sheet that uses the above binder to form the sheet skeleton can be used. be able to.

The laminated sheet-like cleaning article of the present invention can be obtained by laminating one or more inner layer sheets with the outer layer sheet with the side high in bainggu on the inner layer sheet side, and embossing the layers.

Types of embossing include 5teel to 5teel emboss, 5teel to rubber emboss, and 5t.
There are eel to paper embossing, Nes Led embossing, and tip to tip mill embossing. 5t shows the best effect of retaining the embossed shape when wet.
eel to 5teel emboss, 5teel to
Rubber emboss, 5teel to paper
r embossed. Emboss pattern depth is 0.3 ~
2mm is desirable.

Further, in order to enhance the cleaning effect, the cleaning article of the present invention is preferably used by impregnating the sheet with 100 to 250% by weight of a cleaning agent containing a surfactant, a solvent, a fragrance, water, etc. based on the weight of the sheet.

〔Effect of the invention〕

The laminated sheet-like cleaning article of the present invention obtained in this way can be removed when the outer layer sheet and the inner layer sheet are peeled off when the cleaning article is taken out of the packaging container and unfolded into a single sheet, or during cleaning work. It does not cause problems such as storage.

This effect is particularly noticeable in ice-melting cleaning articles in which a sheet-like ice-melting cleaning article using a water-soluble binder is impregnated with a cleaning agent having a water content of 30% by weight or more.

〔Example〕

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

Example I C5F (Canadian Standard Freeness)
A binder-free sheet with a basis weight of 25 g/rrf, similar to toilet paper, was produced from the raw material of a softwood kraft valve that had been beaten to a weight of 680 d using ordinary paper manufacturing equipment.

The prepared binder-free sheet was coated with water-soluble sodium salt of carboxymethylcellulose (CMC2200, manufactured by Daicel Chemical Industries, Ltd.) in an amount of 5% relative to the sheet weight.
% (1,258/rrf) on one side of the sheet and dried to obtain an outer layer sheet containing the sodium salt of CMC.

As a result of analyzing the iron surface of this outer layer sheet using an X-ray macro analyzer using a crosslinking reaction between CFIC and iron, the CMC content ratio on the front and back surfaces of the outer layer sheet was found to be coated side/non-coated side = 1.93/1. Met.

On the other hand, a toilet paper-like binder-free inner layer sheet with a basis weight of 40 g/rrf was manufactured using the same paper manufacturing equipment.

The coated surface of the outer layer sheet prepared in this way is placed on both sides of the inner layer sheet, and embossing (Steel to
5teel emboss, height of protrusion 0.9+mn.

The same procedure was applied to the following Examples and Comparative Examples) to prepare a laminate sheet having a three-layer structure with a basis weight of 90 g/bo (25/40/25).

The obtained laminated sheet was impregnated with the following cleaning agent in an amount of 200% by weight based on the weight of the laminated sheet to obtain a wet cleaning article.

- Benzalkonium chloride 0.01% by weight - Ethanol 46 - Jetanolamine 3° Water Balance The physical properties of the sheet-like cleaning article thus obtained were evaluated as follows.

<Adhesive strength between outer layer sheet/inner layer sheet> The obtained wet cleaning article has a width of 25III11 and a length of 150III11.
After cutting it into strips, peel off the outer layer sheet and inner layer sheet at the ends in the length direction by about 15 cm, and then peel off each of the outer layer sheet and inner layer sheet using two test piece gripping devices of a universal compression tensile strength tester. Fix the part and pull speed 30
The adhesive strength between the outer layer sheet and the inner layer sheet was measured under the conditions of 0II[Il/WIin.

<Peeling between laminated sheets> Wet cleaning products (size: 30 x 30 cm) were folded into four, stacked with 10 sheets, placed in a container, and given to 50 housewives (panelists) to use for cleaning around their homes. We asked them to evaluate the peeling of the laminated sheet when unfolding the folded item and when cleaning it.

The evaluation criteria are as follows.

O: All (50 people) answered that there was no peeling of the laminated sheet.

◎: More than 80% (40 to 49 people) answered that there was no peeling of the laminated sheet.

△: 6 or more and less than 80% (30 to 39 people) answered that there was no peeling of the laminated sheet.

×: Less than 60% (~29 people) answered that there was no peeling of the laminated sheet.

The results are shown in Table-1.

Comparative Example 1 Same as Example 1 except that the outer layer sheet and inner layer sheet obtained in the example process were used, and the non-coated surface of the outer layer sheet was placed on the inner layer sheet side and embossing was performed (Steel to 5 tee + embossing). A wet ice-melting cleaning article was prepared and evaluated in the same manner as in Example 1.

The results are shown in Table-1.

Table-1 Example 2 C5F (Canadian Standard Freeness)
A binder-free sheet with a basis weight of 25 g/rrf, similar to toilet paper, was produced from a raw material of softwood kraft pulp that had been beaten to a thickness of 680 m using ordinary paper manufacturing equipment.

For the manufactured binder-free sheet, a sodium salt of water-soluble carboxymethyl cellulose (FT-30, manufactured by Chongyang Kokusaku Valve) was dissolved in water to a concentration of 3%, and the content was 5% (1, 25g/rr
't) was spray coated on one side of the sheet and dried to obtain an outer layer sheet containing the sodium salt of CMC.

As a result of measuring the CMC content ratio of the sprayed surface/non-sprayed surface of this outer layer sheet in the same manner as in Example 1, it was found that 1
．． It was 3/1.

On the other hand, a toilet paper-like binder-free inner layer sheet with a basis weight of 40 g/m2 was manufactured using the same paper manufacturing equipment.

The spray-coated surfaces of the outer layer sheet prepared in this way were placed on both sides of the inner layer sheet, and embossed (steel)
1 to 5teel embossing), basis weight 90g
A laminate sheet having a three-layer structure of /Po (25/40/25') was prepared.

The resulting laminated sheet was impregnated with a cleaning agent having the composition shown below at 200% by weight based on the weight of the laminated sheet to obtain a wet ice-melting cleaning article.

- Benzalkonium chloride - Calcium chloride 0.01 - Ethanol 10% by weight - Propylene glycol 7 - Ion exchange water Balance The physical properties of the sheet-like cleaning article thus obtained were evaluated in the same manner as in Example 1. In addition, the wet tensile strength and surface friction strength of the cleaning article were evaluated using the following methods.

<Wet tensile strength> A sheet-like cleaning product impregnated with a cleaning agent with a width of 25 cm and a length of 1
After cutting into strips of 00II11, the strength at break was immediately measured using a universal compression and tensile testing machine (RTM-25 manufactured by Orientic Co., Ltd.) at a tensile speed of 300IIIll/ll1in and a specimen gripping interval of 50cm. .

<Surface Friction Strength> A tile board with joints (joint width 3+ma) was prepared by arranging 24 x 24 mm tiles in 5 rows vertically and 15 rows horizontally, and a sheet-like cleaning product impregnated with a cleaning agent was applied over the tile board for 1 k.
The tile board is wiped horizontally with a stroke of 30 cm under a load of g/C1l.

One reciprocating stroke of 30 cra was defined as one stroke, and the number of strokes until fuzz was generated from the cleaning agent-impregnated sheet-like cleaning article and paper powder lumps remained on the tile board was defined as the surface friction strength.

These results are shown in Table-2.

Comparative Example 2 Using the outer layer sheet and inner layer sheet obtained in Example 2, the non-sprayed surface of the outer layer sheet was placed on the inner layer sheet side and embossed (5 teeth).

A wet ice-melting cleaning article was prepared in the same manner as in Example 2, except that it was embossed (Steel embossing), and the above evaluation was performed.

The results are shown in Table-2.

Table 2 Example 3 A web of defibrated and stacked softwood fluff pulp (basis weight 20 g/rrf) was treated with 3% sodium salt of carboxymethylcellulose (CMC1330, manufactured by Daicel Chemical Industries, Ltd.) and 0.0% calcium acetate, respectively. CMC/Ca (C8zcO
O) Z aqueous solution at 20% (4 g/rr
After spraying only one side of the web so as to obtain f), it was dried to prepare an outer layer sheet containing CMC-Ca (crosslinked binder).

As a result of measuring the CMC content ratio of the sprayed surface/non-sprayed surface of this outer layer sheet in the same manner as in Example 1, it was found that 1
．． It was 2/1.

On the other hand, polyvinyl alcohol (PVA-110, manufactured by Kuraray Co., Ltd.) was sprayed onto one side of the defibrated and stacked softwood fluff pulp web (basis weight 20 g/rrf) just to form the sheet skeleton, and then dried. An inner layer sheet was prepared.

The sprayed surface of the outer layer sheet prepared in this way was placed on both sides of the inner layer sheet, and embossing (Steel) was applied.
to 5teel embossing), basis weight 90g/po (
A laminated sheet having a three-layer structure of 20150/20'') was prepared.

The obtained laminated sheet was impregnated with the same cleaning agent as in Example 2 at 170% by weight based on the weight of the laminated sheet to obtain a wet ice-melting cleaning article.

The physical properties of the sheet-like cleaning article thus obtained were evaluated in the same manner as in Example 2.

The results are shown in Table-3.

Comparative Example 3 Using the outer layer sheet and inner layer sheet obtained in Example 3, the non-sprayed surface of the outer layer sheet was placed on the inner layer sheet side and embossed (Steel t.

A wet ice-melting cleaning article was prepared in the same manner as in Example 3, except that it was embossed (Steel embossing), and evaluated in the same manner as in Example 3.

The results are shown in Table-3.

Claims (1)

[Scope of Claims] 1. In a laminated sheet-like cleaning article obtained by laminating and embossing an outer layer sheet and an inner layer sheet, a difference is made between the binder contents on both the front and back surfaces of the outer layer sheet, and the binder content of the outer layer sheet is high. A laminated sheet-like cleaning article characterized in that a surface is arranged on the inner layer sheet side. 2. The laminated sheet-like cleaning article according to claim 1, wherein the outer layer sheet is an outer layer sheet with a binder sprayed or coated on the surface on the inner layer sheet side. 3 The basis weight of the outer layer sheet is 5 to 50g/m^2, and the amount of binder used is 1 to 3% of the dry weight of the outer layer sheet.
The laminated sheet-like cleaning article according to claim 1 or 2, which contains 0% by weight. 4. Claims 1 to 3, wherein the binder is a water-soluble binder.
The laminated sheet-like cleaning article according to any one of the above. 5. A laminated sheet cleaning article obtained by impregnating the laminated sheet cleaning article according to any one of claims 1 to 4 with a cleaning agent containing 30% by weight or more of water.