JP2005139603A - Paper product for kitchen use - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide paper products for kitchen use, excellent in water absorptivity, flexibility and wet strength, causing neither scuffing nor pulp powder and having excellent heat resistance. <P>SOLUTION: The paper products for kitchen use comprises a cellulose fiber (A), a first synthetic fiber (B1), a second synthetic fiber (B2) of an other material than the first synthetic fiber, and a binder (C). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to kitchen paper products.

  Conventionally, packaging and preservation of ingredients such as meat and fish, preparation of cooking by draining meat, fish, vegetables, etc., wiping and draining cutting boards, cooking utensils, tableware, cooking tables, sinks, etc. In addition, so-called kitchen paper products (sometimes referred to as kitchen paper, kitchen sheets, etc.) using non-woven fabrics and papermaking sheets are used.

  Properties required for kitchen paper products include high water absorption (high moisture retention), moderate softness, no fluffing or pulp powder, and high wet strength. .

From this point of view, various improvements have been studied for kitchen paper products. For example, Patent Document 1 includes hydrophilic fibers and synthetic fibers, and specific volume, thickness, water retention, and water absorption are within a specific range. It is disclosed that a certain nonwoven fabric is used for a kitchen sheet. Patent Document 2 discloses that wet papermaking paper, which is made of pulp or pulp and synthetic fiber, and has a compression rate, compression elastic modulus, bending resistance, and thickness within a specific range, is used for kitchen paper. Yes. Patent Document 3 discloses that a paper material formed by drying is produced by bonding cellulose fiber web fibers with a thermal bonding fiber and a binder.
Japanese Patent Laid-Open No. 2003-190067 JP 2001-207399 A Japanese National Patent Publication No. 9-510753

  However, kitchen paper products that have a good balance of high water absorption (high moisture retention), moderate softness, no fluffing and pulp powder, and high wet strength are still found. It has not been. Furthermore, considering the use situation of kitchen paper products, in addition to these characteristics, it is desirable to have excellent heat resistance.

  Patent Document 1 is produced by a spunlace method in which a nonwoven web is substantially entangled under a high-pressure water flow, and since the cited document 2 is also just a wet papermaking, water absorption, suppleness, It is not sufficient in terms of preventing fluff and preventing pulp powder generation. Patent Document 3 describes that contamination by short fibers can be prevented, but this means that the short fibers that are not completely bonded during web production can be prevented from protruding and falling off, and used as a kitchen paper product. It does not suggest that the occurrence of fluff and pulp powder occurring in some cases can be prevented.

  An object of the present invention is to provide a kitchen paper product having the above characteristics in a well-balanced manner, and further a kitchen paper product excellent in heat resistance.

  The present invention includes a cellulose fiber (A), a first synthetic fiber (B1), and a second synthetic fiber (B2) made of a material different from the first synthetic fiber (hereinafter referred to as (B1) and ( B2) may also be referred to as a synthetic fiber (B)] and a kitchen paper product including a binder (C).

  According to the present invention, it is possible to obtain a kitchen paper product having good water absorption, suppleness, and wet strength, without generating fuzz and pulp powder, and having excellent heat resistance.

<Cellulose fiber (A)>
Examples of the cellulosic fiber (A) used in the present invention include cotton, pulp, rayon, cupra, lyocell and the like, and pulp is particularly preferable from the viewpoint of water absorption performance and price. Examples of the pulp include kraft pulp (KP) obtained from pulp chips such as hardwoods and conifers.

<Synthetic fiber (B)>
In the present invention, two types of synthetic fibers (B1) and (B2) made of different materials are used. The “different material” may be any material that can be recognized as a different substance. For example, the constituent monomers of the polymer compound used as the fiber raw material are different, and the constituent monomers are the same. Those having different molar ratios of constituent monomers, those having different molecular weights of the polymer compound, and those having different physical properties such as the melting point of the polymer compound are treated as “different materials”. The two synthetic fibers (B1) and (B2) made of different materials preferably have different melting points. Although the synthetic fibers (B1) and (B2) may be used separately, the composite fibers of (B1) and (B2), particularly those forming a core-sheath structure are preferred. Among these, those having a high melting point in the core are preferred. The difference between the melting points is preferably 10 to 130 ° C., more preferably 20 to 80 ° C., and particularly preferably 30 to 65 ° C. from the viewpoint of ease of fiber production, ease of fiber handling, and cost. Examples of the synthetic fibers include polyolefins such as polyethylene (hereinafter referred to as PE) and polypropylene (hereinafter referred to as PP), polyesters such as polyethylene terephthalate (hereinafter referred to as PET), nylon, polyvinyl chloride, and the like. The thing which consists of a high molecular compound is mentioned. From the viewpoint of safety, processability, price, etc., olefin fibers and polyester fibers are preferable, PE, PP, and PET are more preferable, PP and PE, PET and PE, first PET and second PET (preferably Is more preferably a combination of PP and PE, and a combination of first PET and second PET (preferably having a melting point different from that of the first PET). Furthermore, the composite fiber whose core / sheath is PP / PE and the composite fiber whose core / sheath is first PET / second PET (different in melting point and the like from the first PET) are most preferable. In addition, 3 or more types of synthetic fibers can also be used.

  The synthetic fiber (B) is preferably a short fiber, and the fiber length is preferably 1 to 10.5 mm, and more preferably 2.5 to 6 mm. The fiber diameter is preferably 1 to 6.6 dtex, more preferably 1.5 to 2.2 dtex.

<Binder (C)>
In the present invention, the binder (C) is necessary for forming a kitchen paper product, and also has an effect of imparting tensile strength and preventing generation of fuzz and pulp powder. In particular, the above-described effects can be more remarkably obtained by allowing the binder to uniformly penetrate not only the surface of the kitchen paper product but also the inside. The amount of the binder (C) is preferably 10 to 20% by weight, and more preferably 12 to 17% by weight, based on the weight of the kitchen paper product, from the viewpoint of imparting tensile strength and preventing generation of fuzz and pulp powder.

  Examples of the binder (C) include acrylic, urethane, silicon, epoxy, vinyl acetate, and synthetic rubber. In particular, an acrylic binder is preferable in terms of being suitable for the airlaid method, capable of maintaining the texture, easily penetrating into the kitchen paper product, and having less odor.

<Kitchen paper products>
The smaller the value of the weight ratio (B) / (A) of the cellulosic fiber (A) and the synthetic fiber (B), the better the water absorption and texture, while the larger the value, the higher the strength when wet. Show. In the present invention, in order to satisfy these characteristics in a well-balanced manner, the weight ratio [(B1) + (B2)] / (A) is preferably 0.2 to 1.5, more preferably 0.5 to 1.

  The kitchen paper product of the present invention can be manufactured using a web (fiber mat) manufactured by an airlaid method, a spunlace method, a wet papermaking method, an air-through method, etc. according to the manufacture of a known nonwoven fabric, From a comprehensive aspect such as bulkiness and strength, it is preferably made of a web produced by the airlaid method. The kitchen paper product of this invention can consist of a nonwoven fabric containing a cellulosic fiber (A), a synthetic fiber (B), and a binder (C).

  The airlaid method (sometimes called the airlaid method) is one of the dry production methods for webs. A short fiber lump is mechanically loosened in a dry state to form single fibers to continuously form the web. After that, a binder is sprayed, and after that, through a dryer process, the fibers in the web are fixed together. In the airlaid method, water is not used and the sheet is formed by air, so that a large amount of air layer can be retained in the sheet. For this reason, high bulkiness (soft feeling) at low basis weight is obtained, and high absorbency, soft touch, etc. are obtained. Also in the present invention, when the airlaid method is used, the fibers are essentially bonded (bonded) with the binder (C), but at least one of the synthetic fibers (B) is made of heat-fusible or thermoplastic fibers and heated. Thermal bonding is preferably performed through the steps.

  The kitchen paper product of the present invention may be composed of a single layer or a laminated type in which a plurality of layers are laminated. In the case of a laminated type, at least one layer may be a layer containing cellulosic fibers (A), synthetic fibers (B) composed of two or more synthetic fibers, and a binder (C). It is preferable to consist of such a layer. In the case of a stacked type, the ratio of (A), (B), (C) in each layer may be different. Moreover, even if it is a single layer, the ratio of (A), (B), (C) may change in the layer, that is, it may be a layer having a gradient. A stacked type of such layers is also possible. In particular, in the airlaid method, a laminated structure of layers including (A), (B), and (C) or a structure in which the ratios of (A), (B), and (C) have a gradient (even if it appears to be a single layer) Can be easily formed.

Since the basis weight of the kitchen paper product of the present invention is 28 to 78 g / m ² , and further 38 to 50 g / m ² , water absorption, tensile strength, and convenience (strength of stiffness) are good. preferable. This basis weight is a value measured according to JIS P 8124.

  The thickness of the kitchen paper product of the present invention is preferably 0.4 to 1.5 mm, more preferably 0.5 to 0.8 mm. This thickness is a value obtained by dividing a value obtained by measuring in a state where four pieces of kitchen paper products are stacked using a peacock digital linear gauge (converted into a thickness per sheet).

The kitchen paper product of the present invention preferably has a water absorption ratio of 12 or more, more preferably 14 or more, and particularly preferably 15 or more. This water absorption magnification is measured by the following method. The kitchen paper product is cut into a square having a side of 7 cm (thickness 0.5 to 0.7 mm), and its weight W ₀ (g) is measured. After immersing the kitchen paper product in a large excess of water (23 ° C.) for 20 seconds, the weight W ₁ (g) after being left in the air at 23 ° C. and a humidity of 50% RH for 30 seconds is measured. The ratio of W ₁ −W ₀ to W ₀ (W ₁ −W ₀ ) / W ₀ is defined as the water absorption magnification.

  Further, the kitchen paper product of the present invention complies with the Krem law [JIS P 8141 (established on June 1, 1965). However, the size of the test piece is 200 mm in length and 15 mm in width, and is measured by sinking 5 mm below the surface of the water. The water absorption height (mm) per minute measured in the above is preferably 15 or more, more preferably 20 or more, and particularly preferably 25 or more from the viewpoint of the water absorption speed. Similarly, the water absorption height (mm) for 10 minutes is preferably 18 or more, more preferably 22 or more, and particularly preferably 30 or more.

Example 1
Pulp is used as the cellulosic fiber (A), PP as the synthetic fiber (B) has a core-sheath structure in which the core is PP having a melting point of 165 ° C., and the sheath is PE having a melting point of 130 ° C., fiber length 5.1 mm, fiber diameter 2.1 dtex The composite fiber of (B) / (A) was used so that the weight ratio thereof was 1, and an acrylic binder was used as the binder (C). In the total amount of (A), (B), and (C), 15 A non-woven fabric having a basis weight of 45 g / m ² and a thickness of 0.55 mm was produced by weight percent using the airlaid method. Thereafter, a roll of a total length of 36 m was used as a sample for evaluation of kitchen paper products.

Example 2
An evaluation sample was obtained in the same manner as in Example 1, except that the weight ratio of (B) / (A) was 0.7.

Example 3
In Example 1, as the synthetic fiber (B), a composite fiber having a core-sheath structure in which the core is PET having a melting point of 255 ° C. and the sheath is PET having a melting point of 200 ° C., having a fiber length of 5.1 mm and a fiber diameter of 1.7 dtex is used. A sample for evaluation was obtained in the same manner except that the weight ratio of (B) / (A) was 0.45.

Example 4
An evaluation sample was obtained in the same manner as in Example 3, except that the weight ratio (B) / (A) was 0.25.

Comparative Example 1
In Example 1, an evaluation sample was obtained in the same manner except that the synthetic fiber (B) was not used.

Comparative Example 2
A non-woven fabric was produced by a spunlace method using pulp (A1) and rayon (A2) as cellulosic fibers (A) so that the weight ratio of (A1) / (A2) was 4. Thereafter, a sample for evaluation was obtained in the same manner as in Example 1.

Comparative Example 3
A sample for evaluation was obtained in the same manner as in Example 1 except that the binder (C) was not used and the dryer temperature in the airlaid method was increased.

Comparative Example 4
In Example 1, an evaluation sample was obtained in the same manner except that a single fiber of PE was used instead of the synthetic fiber (B).

<Performance evaluation>
The following performance evaluation was performed on the sample for evaluation of kitchen paper products obtained above. The results are shown in Table 1.

(1) Wet strength The sample for evaluation is cut into a length of 80 mm and a width of 25 mm. After setting in a tensile tester (Tensilon, 50 mm between chucks), the center is wetted with 0.2 ml of water. Measure the strength at break when pulled in the length direction at 300 mm / min. The strength in each of the MD direction and the CD direction was measured by changing the cutting direction of the evaluation sample.

(2) Water Absorption Ratio (W ₁ −W ₀ ) / W ₀ was determined by the above measurement method.

(3) Flexibility Flexibility is evaluated by arbitrarily bending the evaluation sample cut in (1) above. When the softness was not good, it was “◯”, when it was slightly poor, “△”, and when it was inferior, “x”.

(4) Fluffing The surface of the sample for evaluation cut in the above (1) is observed with the naked eye to check for fluffing. When there was no fluffing, “◯” was given, and when fuzzing was given, “x” was given.

(5) Pulp powder The surface of the sample for evaluation cut in (1) above is tapped by hand, and the presence or absence of fluttering powder is confirmed with the naked eye. When the powder did not dance, “○”, and when the powder danced, “×”.

(6) Heat resistance Among the fibers used for preparing the sample for evaluation, the melting point of the fiber having the lowest melting point was regarded as heat resistance.

Claims (7)

Kitchen paper product comprising cellulosic fiber (A), first synthetic fiber (B1), second synthetic fiber (B2) made of a material different from the first synthetic fiber, and binder (C) . The kitchen paper according to claim 1, wherein the weight ratio of (A) to the sum of (B1) and (B2) is 0.2 to 1.5 in terms of [(B1) + (B2)] / (A). Product. The kitchen paper product according to claim 1 or 2, wherein (A) is pulp fiber. The kitchen paper product according to any one of claims 1 to 3, wherein (B1) and / or (B2) is an olefin fiber. (B1) and / or (B2) is a polyester fiber, The kitchen paper product in any one of Claims 1-4. The kitchen paper product according to any one of claims 1 to 5, wherein (B1) and (B2) form a core-sheath structure. The kitchen paper product according to any one of claims 1 to 6, comprising a web produced by an airlaid method.