JP3679082B2 - Sanitary paper - Google Patents

Description

【発明の効果】
以上の説明から明らかなように、本発明はパルプ繊維を主原料とするキッチンタオルにおいて、主たる原料である針葉樹パルプとして繊維粗度が低く微細繊維の少ないパルプを用いることにより、柔軟性及び吸収性を満足しながら、湿潤引張強度の大きく、かつ縦／横強度のアンバランスを解消したキッチンタオルを得ることができる。
【図面の簡単な説明】
【図１】 エンボス加工の様子を表した図である。
【図２】 他のエンボス加工の様子を表した図である。
【図３】 吸油量又は吸水量の測定方法で用いられる測定器の図である。
【符号の説明】
１…一方のシート、２…他方のシート、３…接着剤、４…治具、５…バット[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sanitary paper to be used at home other, among these relates to the relatively heavyweight key Tchintao Le.
[0002]
[Prior art]
Conventionally, sanitary paper such as kitchen towels is often used in kitchens and kitchens. Kitchen towels are used, for example, for wiping dishes instead of towels, or for wiping off splashes of seasonings and food debris, and are used to keep the kitchen area hygienic. Kitchen towels are also used in the cooking process as draining vegetables and tempura. Therefore, kitchen towels need to be flexible so that they can be easily wiped off. In addition to the strength when dried, the kitchen towel needs strength when wet so that it can be wiped even when wet, and drains vegetables. Absorbency such as water absorbency and oil absorbency is necessary so that oil can be drained from tempura and tempura.
[0003]
Such kitchen towels are made of paper obtained by making wood pulp fibers, made of airlaid nonwoven fabric obtained by binding pulp fibers with a vinyl polymer compound, and mixed with pulp fibers and thermoplastic synthetic fibers. There are various types of materials such as non-woven fabrics obtained by mechanically interlacing these fibers by applying a high-pressure jet water flow to the resulting web.
[0004]
Among these kitchen towels, especially those made of paper are generally relatively high in density and poor in air permeability and liquid permeability, and have low strength, particularly wet strength. Although it is possible to improve the strength by using a binder, it is preferable to avoid using the binder as much as possible in terms of food hygiene. In general, in the manufacture of paper kitchen towels, it is possible to improve the wet strength by using a large amount of softwood pulp. Must satisfy the sex and must also absorb.
[0005]
Conventionally, as tissue papers proposed for the purpose of improving flexibility, hand feeling, strength, etc., there are, for example, Patent Document 1 and Patent Document 2 below.
[Patent Document 1]
JP-A-61-221753 [Patent Document 2]
Japanese Patent Laid-Open No. 9-98904 [0006]
[Problems to be solved by the invention]
The present invention is to solve the above drawbacks, at the same time to satisfy the wet strength, to provide flexibility and excellent water-oil-absorbing, and the vertical / horizontal strength paper kitchen towels which overcomes the unbalance of is there.
[0007]
[Means for Solving the Problems]
As a result of intensive studies on paper kitchen towels, the present inventors have found that kitchen towels mainly composed of softwood pulp having a fiber fiber roughness (according to TAPPI T234hm-84) of 15 mg / 100 m or less have the above-mentioned problems. I have found that I can achieve it. The present invention has been made based on this.
[0008]
As a result, as the present invention according to claim 1, in a kitchen towel manufactured using cellulose pulp as a main raw material,
Among the raw pulp, contains 70% by weight or more of softwood pulp having a fiber fiber roughness (according to TAPPI T234hm-84) of 15 mg / 100 m or less in an absolutely dry weight, and the fine fiber occupying the softwood pulp ( Paper of JIS P8207 results of testing by sieving test method manufacturing pulp ", which passes through the fourth layer of screening tester long fiber pulp (wire mesh Nominal 297Myu m particle size)) and the content of less 12 weight percent, And among the said raw material pulp, hardwood pulp contains 30 weight% or less by an absolute dry weight,
Wet tensile strength ( JIS According to P8135 , a kitchen towel is provided that is 560 c N / 25 mm or more in the longitudinal direction and has an aspect ratio of 2.5 or less .
[0009]
As a second aspect of the present invention, there is provided a kitchen towel according to the first aspect, wherein a softener for paper is added.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail.
[0011]
The kitchen towel manufactured using the cellulose pulp of the present invention as the main raw material has a pulp fiber roughness (according to TAPPI T234hm-84) of 15 mg / 100 m or less, preferably 14 mg / 100 m to 10 mg / 100 m. Conifer pulp contains 70% by weight or more, preferably 80% by weight to 99% by weight, in absolute dry weight.
[0012]
In the kitchen towel of the present invention, a softwood pulp that has a long average fiber length and high tensile strength in order to maintain strength, particularly tensile strength, and that easily raises paper strength by beating is used as a main raw material. When the fiber roughness (the weight of the fiber per unit length, according to TAPPI T234hm-84) exceeds 15 mg / 100 m, the flexibility (flexibility) required for kitchen towels is lost. Further, if the softwood pulp is less than 70% by weight in the total cellulose pulp, the wet strength required for kitchen towels cannot be obtained.
[0013]
In the present invention, the fine fibers of the above-mentioned softwood pulp are contained in an amount of 12% by weight or less, preferably 10% by weight to 5% by weight. In the present invention, the term “fine fiber” means that the above-mentioned softwood pulp was tested according to “Paper Pulp Screening Test Method” of JIS P8207. The one that passes through the wire net). In addition, when a wet paper strength enhancer is added, the rise in wet strength is improved by suppressing the content of fine fibers having poor fixability to pulp fibers. Moreover, since the fine fiber has a high fiber roughness, if it exceeds 12% by weight, a kitchen towel with good flexibility cannot be obtained.
[0014]
Although all the cellulose pulp can be made into the above-mentioned softwood pulp, it is desirable that hardwood pulp is contained in an absolute dry weight of 30% by weight or less, preferably 20% by weight to 1% by weight in the total cellulose pulp. . By containing hardwood pulp, the kitchen towel can be given a soft and good hand feeling, and when the pulp fiber is discharged from the head box during paper making, the hardwood pulp is mixed, The orientation can be disturbed, and a part of the fibers are oriented in the transverse direction, whereby the transverse strength can be increased. As a result, it is possible to eliminate the imbalance between the vertical / horizontal strength of the kitchen towel and to reduce the ratio of the vertical / horizontal strength.
[0015]
In the present invention, a softening agent for paper can be contained in order to make the kitchen towel more soft and feelable. Examples of the paper softener include fatty acid ester softener (US Pat. No. 3,296,065), quaternary ammonium salt type cationic activator (Japanese Patent Laid-Open No. 48-22701), urethane alcohol or a salt thereof, Or a cationized product (JP-A-60-139897), a non-cationic surfactant (JP-A-2-99690, JP-A-2-99691), polyphosphate (JP-A-2-36288) And polysiloxane (JP-A-2-224626 and JP-A-3-900).
[0016]
Moreover, in order to raise the wet strength of a kitchen towel, a wet paper strength enhancer can be contained. Examples of the wet paper strength enhancer include urea formaldehyde resin, melamine formaldehyde resin, polyamide, polyamine, and epichlorohydrin resin.
[0017]
In the kitchen towel of the present invention, a softwood pulp having a long average fiber length and a high tensile strength is used as the main raw material of the pulp in order to maintain the strength, particularly the tensile strength. Yankee paper machines such as gantry and long net type can be used. Examples of the papermaking method include a method of making paper as a uniform layer by mixing all conventional pulp.
[0018]
Moreover, it is desirable to emboss the kitchen towel in order to increase bulkiness and liquid absorbency. Embossing has the function of improving wiping properties.
[0019]
The embossing is roughly classified into “nested” disclosed in Japanese Patent Laid-Open No. 61-33628 and “Tip to Tip” disclosed in Japanese Patent Laid-Open No. 57-195430.
[0020]
As shown in FIG. 1, “Tip to Tip” is obtained by adhering the top of the embossed protrusion 1 </ b> A of one sheet 1 with an adhesive 3. As shown in FIG. 2, “nested” means that the embossed convex portion 1 </ b> A of one sheet 1 is fitted into the embossed concave portion 2 </ b> B of the other sheet 2 and the space H is left in the fitted region. The top part of the embossed convex part 1A and the bottom part of the embossed concave part 2B are bonded by the adhesive 3.
[0021]
As the adhesive used here, there are those which are not problematic in terms of food hygiene, such as sodium polymide, polyamide, polyamine, epichlorohydrin and the like.
[0022]
Currently, these two types are mainly used for “kitchen towels” in Japan, but there are also “random” types that do not have regularity.
[0023]
The kitchen towel of the present invention preferably has a wet tensile strength (according to JIS P8135) of 560 CN or more and a longitudinal / lateral strength ratio of 2.5 or less. Thereby, even if a force is applied to one of the vertical and horizontal sides, the kitchen towel does not easily break. In order to obtain these desired wet tensile strength and longitudinal / lateral strength ratios, as described above, a method of adjusting the content of softwood pulp, the amount of fine fibers in the softwood pulp, the content of hardwood pulp, etc. is employed. That's fine.
[0024]
【Example】
EXAMPLES The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to these examples. In the examples and comparative examples, “%” represents “% by weight” unless otherwise specified. The evaluation methods used in the following examples and comparative examples are as follows.
[0025]
(1) Fiber roughness measurement method (TAPPI T234hm-84)
Collect a certain amount of undiluted slush pulp or redissolved dry pulp sample and measure the number of fibers and the number average fiber length with a Kajaani FS-200 automatic fiber length distribution measuring machine (Valmet Automation). The unit was mg / 100 m by dividing the absolute dry weight of the pulp separately measured by multiplying the number of fibers by the number average length.
[0026]
(2) Method for measuring the amount of fine fibers
The measurement was performed according to “JIS P8207“ Paper Pulp Screening Test Method ”. However, the wire mesh used in the sieving test machine was a combination of long fiber pulp, and the degree of sieving (weight%) of the wire mesh passing through the 297 μm particle size of the fourth size was defined as the fine fiber content.
[0027]
(3) Measuring method of oil absorption and water absorption Cut the sample into 100mm x 100mm, collect 5 test pieces, measure the weight of each of the 5 test pieces and record up to 3 digits after the decimal point. A sample is placed on the jig 4 shown in FIG. 3 and placed in a bat 5 containing oil (or water). The sample is floated on the oil (or water), and when the oil (or water) has spread over the entire sample, the sample is pulled up using the jig 4 and oiled (or drained) for 30 seconds. After draining the oil (or water), the sample is transferred to another container (the weight of the container is measured in advance) using tweezers, and the weight is measured. The sample is kept horizontal, and oil (or water) that does not fall off is scraped off at the edge of the jig 4. This operation is repeated 5 times and the average is defined as the oil absorption (or water absorption).
[0028]
(Example 1)
The ratio of pulp used is absolutely dry pulp, 90% softwood pulp and 10% hardwood pulp, softwood pulp with a fiber roughness of 14mg / 100m and fine fiber 9%, and 0.15% polyethylene oxide as a dispersant ( Polyamide / polyamine / epichlorohydrin resin 0.12% (based on papermaking raw material) as wet paper strength enhancer, 0.05% quaternary ammonium salt type cationic activator as softener (based on papermaking raw material) And a kitchen towel was produced by a circular net paper machine.
[0029]
(Comparative Examples 1-4)
Comparative Examples 1 to 4 are all commercially available products.
The evaluation results are shown in Table 1. In addition, the sensory evaluation was performed by a monitor of 30 people, and the softness of each specimen was confirmed by hand. And ◎: 25 or more were good, ○: 20-25 were good, Δ: 15-20 were good, and x: less than 15 were good.
[0030]
[Table 1]

【The invention's effect】
As is apparent from the above description, the present invention is a kitchen towel mainly composed of pulp fibers. By using a pulp having low fiber roughness and few fine fibers as softwood pulp as the main raw material, flexibility and absorbency are achieved. while satisfying, it is possible to obtain wet tensile the size of strength rather, and the vertical / horizontal intensity kitchen towel to eliminate the imbalance of.
[Brief description of the drawings]
FIG. 1 is a diagram showing a state of embossing.
FIG. 2 is a diagram showing another embossing state.
FIG. 3 is a diagram of a measuring instrument used in a method for measuring oil absorption or water absorption.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... One sheet, 2 ... The other sheet, 3 ... Adhesive, 4 ... Jig, 5 ... Butt

Claims (2)

In kitchen towels made with cellulose pulp as the main ingredient,
Among the raw pulp, contains 70% by weight or more of softwood pulp having a fiber fiber roughness (according to TAPPI T234hm-84) of 15 mg / 100 m or less in an absolutely dry weight, and the fine fiber occupying the softwood pulp ( Paper of JIS P8207 results of testing by sieving test method manufacturing pulp ", which passes through the fourth layer of screening tester long fiber pulp (wire mesh Nominal 297Myu m particle size)) and the content of less 12 weight percent, And among the said raw material pulp, hardwood pulp contains 30 weight% or less by an absolute dry weight,
Wet tensile strength ( JIS Kitchen towels according to P8135) is that in the vertical direction 560c N / 25 mm or more and the aspect intensity ratio is equal to or less than or equal to 2.5. Kitchen towels according to claim 1, wherein the softening agent for paper is added.

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