JPWO2014041681A1 - Kitchen towel and method for manufacturing the same - Google Patents

Abstract

Pulp is the main component, one or more sheets are stacked, and one set of basis weight is 15 to 50 g / m2, and oil absorption / basis weight is 4.5 to 7.5 OIL-g / g. A kitchen towel made of paper that provides a high oil absorption even when the basis weight is low. However, the amount of oil absorption is a rectangular test piece with a side of 7.62 cm, sampled from the one set of sheets of the kitchen towel in a vat with a depth of 1 cm of JAS-standard food blend oil at a temperature of 23 ± 1 ° C. After the sample is immersed for 2 minutes, the test piece is measured from the change in mass when it is lifted from the bat and suspended for 30 minutes.

Description

  The present invention relates to a kitchen towel mainly composed of pulp and a method for producing the same.

In kitchens and kitchens, disposable kitchen towels made of paper or non-woven fabric have been widely used to wipe off moisture and dirt around dishes and sinks and absorb moisture and oil from foods. This kitchen towel is required to have high moisture and oil absorption, high bulk (bulk), and higher strength. Among these, kitchen towels made of non-woven fabric have a problem of high cost, although they have high absorbability of moisture and oil. Moreover, since the kitchen towel may have an oil absorption speed that is too high, when the oil content on the front and back of the tempura garment is absorbed, the oil content remaining on the garment may vary greatly depending on the part of the garment, which may impair the taste.
On the other hand, in order to sufficiently wipe off and absorb moisture and oil in a general kitchen towel mainly composed of pulp, the basis weight may be increased, but the cost also increases.

As a method of obtaining a high-bulk and soft paper product, a chemical called debonder or bulking agent is added to the papermaking raw material in the papermaking process and chemically treated to suppress loosening of the fiber layer of the web by suppressing interfiber bonding of pulp fibers. A method of giving is known (Patent Document 1).
Further, as a mechanical treatment for obtaining a high-bulk paper product, a method TAD (through air drying) method (patent document 2) is a method in which wet paper is air-dried without press-dehydrating in the paper-making process. ), And a method of performing uneven treatment on the wet paper web between the wet paper formation and the drying process.
Furthermore, there is a method of mechanically treating the web after paper making by embossing or the like. Further, these methods may be combined.
However, in the case of the above-mentioned chemical treatment method, there is a problem that the cost of the medicine is high and the strength of the web is lowered because the fiber-to-fiber bond of the pulp is lowered. Furthermore, the paper strength reduction due to the chemical treatment is compensated for by blending raw materials, changing beating conditions, and adding a temporary wet paper strength agent, and also compensating for the paper thickness reduction due to beating by processing with a high crepe rate (patent document) Although 3) is disclosed, there is a problem in that the water absorption rate decreases due to the use or beating of the drug. Further, in the case of the above TAD method, the cost of the drying energy becomes enormous. Furthermore, in the method of performing unevenness treatment after paper making, the bond between fibers and the paper layer structure are broken, the web strength is lowered, or the apparent bulk of the web is increased, but the paper layer bulk (caliper) of the web itself is increased ( There is a problem that it is difficult to produce a soft feeling).

On the other hand, in the paper making of conventional paper products, the wet paper web is dehydrated by pressing it with a Yankee dryer at one or two roll press nips through a felt, and further attached to a Yankee dryer (cylinder) and then dried. Creping (crease) is performed when the web is peeled off from the dryer. Moreover, in a press part, like a double felt machine, it presses with the top and bottom rolls of a wet part, and dehydrates, and it may press against a Yankee dryer by a roll press nip after that.
However, there is a problem that the web becomes relatively low-bulk by applying to this Yankee dryer. And even if it tries to suppress the bulk fall by creping by adding the above-mentioned bulking agent to a pulp raw material, only the bulkiness effect of about 3 to 5% is obtained at most, On the other hand, intensity | strength falls remarkably.
In addition, the TAD method described above is a technique in which the final drying and creping are performed with a Yankee dryer and dehydrated with a vacuum, and preliminarily dried with a ventilating dryer. And a high bulk web is obtained. However, since the TAD method removes moisture equivalent to press nip dehydration by ventilation heat, it is said that about twice as much drying energy is required as compared with the conventional roll press nip method.

Therefore, as a method for performing high bulk processing in the wet paper process without using the TAD method, a method of adjusting pressure dehydration by a wide press nip called a shoe press method has been proposed (Patent Document 4). The shoe press method can obtain a higher bulk and softness than the conventional roll press nip method, but cannot obtain a higher bulk than the TAD method.
Furthermore, as a method for solving these problems, a paper machine called a fabric press system has been developed (Patent Document 5). The fabric press method follows the conventional press technology, but is provided with unevenness on the web by means of an uneven belt or fabric simultaneously with dewatering. This dewatering and roughening is performed in one or more press nips while the wet web is fed from the felt to the roughening belt, and then the web is transported to a Yankee dryer and dried.
According to the fabric press method, a high bulk equivalent to the TAD method can be obtained while the drying energy is equivalent to that of the conventional roll press nip method.

The structure of the web by the fabric press method is not a woven fabric, but forms a three-dimensional pattern similar to the woven fabric. This is considered because web unevenness is performed as follows. That is, during the pressing process, the fibrous network fills the three-dimensional pattern (pattern) of the concavo-convex belt, but at that time, the three-dimensional pattern of the concavo-convex layer forms a wet fibrous web. Is granted. The wet fibrous webs are moveable relative to each other, so that they take a new position and orientation relative to each other due to the elastic compression of the press felt. Press felt presses the wet fibrous web against the three-dimensional pattern of the textured belt, thereby increasing bulk and softness with the same basis weight and an improved structure.
The bulk of the web is then maintained uncompressed by receiving a fibrous network (network) in cavities in the belt structure while dewatering in the press nip.

Japanese Unexamined Patent Publication No. Hei 7-189171 JP-A-8-3890 JP 2004-209150 A JP-A-6-158578 Special table 2001-521999 gazette

However, even if the technique described in Patent Document 5 is used, the strength and bulk of the kitchen towel can be increased, but it is difficult to achieve a high oil absorption with a low basis weight.
Therefore, an object of this invention is to provide the kitchen towel which has a pulp as a main component and can obtain high oil absorption even if basic weight is low, and its manufacturing method.

In order to solve the above-mentioned problems, the kitchen towel of the present invention is mainly composed of pulp, and one or two or more sheets are stacked, and one basis weight is 15 to 50 g / m ² , and the oil absorption amount / tsubo. The amount is 4.5 to 7.5 OIL-g / g. However, the amount of oil absorption is a rectangular test piece with a side of 7.62 cm, which is taken from the one set of sheets of the kitchen towel in a vat with a depth of 1 cm of a food preparation oil standardized to JAS at a temperature of 23 ± 1 ° C. After the sample is immersed for 2 minutes, the test piece is measured from the change in mass when it is lifted from the bat and hung for 30 minutes.

The oil absorption rate is preferably 2.0 to 100.0 seconds. The oil absorption rate is measured according to the water absorption of the old JIS-S3104 method, except that the food preparation oil is used instead of water for the one set of sheets.
It is preferable that the height difference of the surface irregularities is 100 to 600 μm.
It is preferable that the area ratio of the recesses on the surface is 2 to 12%.

OIL GMT = (OIL MDT × OIL CDT) ^1/2 which is the square root of the product of the tensile strength OIL MDT in the longitudinal direction when wet and the tensile strength OIL CDT in the transverse direction when wet according to the former JIS S3104 It is preferably 0.1 to 0.5 N / {25 mm × (g / m ² )} per basis weight. However, OIL MDT and OIL CDT are performed based on the measurement of the wet strength of the old JIS S3104, except that the food preparation oil having a temperature of 23 ± 1 ° C. is used instead of water.

  The manufacturing method of the kitchen towel of the present invention is the manufacturing method of the kitchen towel, wherein the uneven paper is pressed against the wet paper web to perform the unevenness simultaneously with the dehydration, and then the web is dried.

  According to this invention, a kitchen towel having pulp as a main component and having a high oil absorption even if the basis weight is low can be obtained.

It is a figure which shows an example of the manufacturing apparatus of the web of the kitchen towel which concerns on embodiment of this invention. It is a figure which shows the measuring method of oil absorption amount. It is a figure which shows an example of the image acquired with the shape measurement laser microscope. It is a figure which shows an example of the height profile of the line segment which crosses the observation visual field of an image. It is a figure which shows the image which took in the kitchen towel surface with the image scanner.

Embodiments of the present invention will be described below.
The kitchen towel according to the embodiment of the present invention includes pulp as a main component, one sheet or two or more sheets stacked, a basis weight of 15 to 50 g / m ² , and an oil absorption amount / basis weight of 4.5 to 7.5 Oil-g / g.

If the basis weight of the kitchen towel is less than 15 g / m ² , the strength decreases, and if it exceeds 50 g / m ² , the cost increases and the softness is inferior. The basis weight is preferably 15~45g / ^{m 2,} more preferably 15 to 40 g / ^{m 2,} and most preferably 15 to 35 g / ^{m 2.}
The basis weight is a value of a kitchen towel product (that is, one or two or more sheets stacked and defined as “one set of sheets”).
If the oil absorption / basis weight of the kitchen towel is less than 4.5 OIL-g / g, the oil wiping and absorption effect is reduced, and if it exceeds 7.5 OIL-g / g, the oil content on the front and back of the tempura garment When using a kitchen towel to absorb the oil, the oil remaining in the clothing is greatly different between the front and back, causing a problem that impairs the taste. The oil absorption / basis weight is preferably 5.0 to 7.5 OIL-g / g, more preferably 5.0 to 7.3 OIL-g / g, and most preferably 5.0 to 7.0 OIL. -g / g.
Moreover, as an example of the method of managing the oil absorption amount / basis weight within the above range, the basis weight is 15 to 50 g / m ^2, and the uneven fabric described later is pressed against the wet paper web, and the unevenness is performed simultaneously with the dehydration. Can be mentioned.

The oil absorption is measured as shown in FIG. First, a set of sheets collected from a kitchen towel is cut using a square template having a size of 7.62 cm (3 inches), and a rectangular test piece having a side of 7.62 cm is prepared. The mass of the test piece before oil absorption is measured with an electronic balance. Set the test piece in a holder (a jig that fixes three points of the test piece, and the jig is made of a metal that does not absorb oil).
Next, a food preparation oil (temperature 23 ± 1 ° C.) having a depth of 1 cm is put into a commercially available vat, and the test piece set in the holder is immersed in the oil for 2 minutes. After immersion for 2 minutes, the test piece is taken out of the oil together with the holder, and a band 210 is attached to one corner 200d of the test piece 200 as shown in FIG. The band 210 is obtained by cutting a 1ply general kitchen towel product into a size of 2 mm wide × 15 mm long and affixing it to a 6 mm portion from the corner 200 d of the test piece toward the center. Next, the holder and the test piece 200 are hung on a stick installed in an empty water tank with the corner 200a facing the corner 200d facing upward, and the lid of the water tank is closed and left for 30 minutes. Thereafter, the holder 220 and the test piece 200 are taken out of the water tank, the band 210 and the holder 220 are removed, and the mass of the test piece 200 is measured with an electronic balance. From the mass change of the test piece 200 before and after being immersed in oil, the oil absorption amount (OIL-g / m 2) per 1 m 2 of the test piece is calculated. Further, the oil absorption (OIL-g / m2) / (g / m2) = OIL-g / g is calculated by dividing the oil absorption (OIL-g / m2) by the basis weight of the test piece. The measurement was performed 5 times for each sample, and the average value was adopted.
This measurement is performed in accordance with JIS-P8111 method at a temperature of 23 ± 1 ° C. and a humidity of 50 ± 2%. Nissin salad oil (B-type viscosity at 23 ° C., 49 mPa · s) manufactured by Nisshin Oilio Group Co., Ltd. can be used as the food preparation oil. In addition, food preparation oil is kept at 23 ± 1 ° C.

The oil absorption rate of the kitchen towel is 2.0 to 100.0 seconds. The above oil absorption rate is preferably 2.0 to 17.0 seconds, more preferably 2.0 to 13.0 seconds, and most preferably 2.0 to 8.0 seconds. If the oil absorption rate of the kitchen towel is less than 2.0 seconds, when the oil content on the front and back of the tempura garment is absorbed by the kitchen towel, the oil content remaining on the garment differs greatly between the front and back, resulting in a problem that impairs the taste. When the oil absorption speed exceeds 100.0 seconds, it becomes difficult to sufficiently absorb the oil.
The oil absorption rate is one set at a temperature of 23 ± 1 ° C. and a humidity of 50 ± 2% in accordance with the water absorption of the old JIS-S3104 method except that the above-mentioned JAS standard food preparation oil is used instead of water. Drop 0.1 ml of oil on the sheet and measure the time (in seconds) that the oil drop is absorbed by the kitchen towel.
Moreover, as an example of the method of managing the oil absorption rate / basis weight within the above range, the basis weight is 15 to 50 g / m ^2, and the uneven fabric described later is pressed against the wet paper web, and the unevenness is performed simultaneously with the dehydration. Can be mentioned.

The kitchen towel contains pulp as a main component (50% by mass or more). Pulp includes wood pulp, waste paper pulp, and non-wood pulp, but the pulp constituting the kitchen towel may be made of 100% wood pulp, and may include waste paper pulp and non-wood pulp. Examples of components other than pulp include fillers, synthetic fibers, and natural fibers. In order to obtain target quality, it is preferable to use wood pulp of NBKP: LBKP = 10: 90 to 90:10 (mass ratio) as a raw material, and a more preferable range is NBKP: LBKP = 30: 70 to 70: 30 and a more preferable range is NBKP: LBKP = 40: 60-60: 40. Pulp produced from Eucalyptus eucalyptus represented by Eucalyptus genus Grandis and Eucalyptus globulus is preferred as the grade of LBKP. Or waste paper pulp can be contained to about 50 mass% with respect to the wood pulp of this pulp ratio. Waste paper pulp has a large variation in quality, and as the blending ratio increases, the quality of the product, particularly the softness, is greatly affected. Therefore, it is desirable to blend 20% by mass or less with respect to the wood pulp.
In addition, in order to ensure appropriate strength for the kitchen towel, raw materials can be blended by ordinary means, and the strength can be adjusted by beating the pulp fiber. As the beating for obtaining the target quality, 0 to 200 ml, more preferably 50 to 200 ml, and still more preferably 50 to 150 ml filtered water with respect to a commercially available virgin pulp in Canadian standard freeness measured by JIS P8121. Reduce the degree. Moreover, you may use a wet paper strength enhancer suitably.

As described above, the kitchen towel according to the embodiment of the present invention has a high oil absorption per unit weight and an oil absorption rate even if the basis weight is relatively low as 15 to 50 g / m ^2. Excellent.

In the kitchen towel according to the embodiment of the present invention, the average value of the height difference of the unevenness on the surface is 100 to 600 μm, preferably 100 to 550 μm, more preferably 150 to 550 μm, still more preferably 170 to 500, the area of the concave portion on the surface. When the average value of the rate is 2 to 12%, preferably 3 to 11%, more preferably 4 to 10%, and still more preferably 5 to 10%, the above-described basis weight and oil absorption amount are surely obtained, which is preferable. .
If the kitchen towel is a 2 ply product, the surface means both sides facing the outside of the product (that is, the opposite side of the sheet stacking surface), and if it is a 1 ply product, both sides of one sheet are used. means.
The height difference of the surface irregularities is measured using a shape measuring laser microscope. The shape measurement laser microscope scans a laser light source, which is a point light source, into pixels obtained by dividing an XY plane in an observation field into a plurality of pixels through an objective lens, and detects reflected light for each pixel with a light receiving element. . Then, the objective lens is driven in the height (Z-axis) direction, and the height information and the reflected light amount are detected with the Z-axis position having the highest reflected light amount as a focal point. By repeating the scanning in this way, an ultra-deep light amount image and a high / low image (information) focused on the whole can be obtained. Since the laser light source is a pinhole confocal optical system, the measurement accuracy is high.
As the shape measurement laser microscope, the product name “Ultra Deep Color 3D Shape Measurement Microscope VK-9510” manufactured by KEYENCE can be used. The product name “VK Viewer” can be used as the observation / measurement software. The measurement conditions are 200x magnification (standard objective lens uses 10x magnification), the measurement mode is color ultra-deep, the gain is adjusted automatically by Auto setting, the measurement pitch is 1μm, the distance (range in the Z-axis direction) Set (μm) to be equal to or greater than the sample paper thickness and measure. Note that the measurement is performed at a location other than the portion mechanically embossed by a process other than the paper machine (for example, a roll winder).

Thereafter, a height profile is acquired from the obtained image using image analysis software (VK Analyzer). First, a line segment L that crosses the observation visual field of the image shown in FIG. 3 is visually drawn so that a white portion and a black portion are adjacent to each other in the image. Since the white portion in FIG. 3 corresponds to the convex portion and the black portion corresponds to the concave portion, the line segment L may be determined so as to cross the portion where the white strong portion and the black strong portion are adjacent to each other. The height profile is acquired by selecting one line segment L for each image. The length of the line segment L is 1.0-1.4 mm. Then, a height profile is obtained as shown in FIG. Here, the height profile in FIG. 4 is a (measurement) cross-sectional curve S that represents the actual surface roughness of the sample, but noise (fiber lumps on the surface of the kitchen towel or fibers are stretched like a beard) In addition, it is necessary to remove such a noise peak when calculating the height difference of the unevenness.
Therefore, the “contour curve” W is calculated from the cross-sectional curve of the height profile, and the difference between the maximum value MAX and the minimum value MIN of the “contour curve” is defined as the “concave height difference”. Here, the “contour curve” is λc: 250 μm from the cross-sectional curve (where λc is a “filter that defines the boundary between roughness component and waviness component” described in JIS-B0601 “3.1.1.2”). It is a curve obtained by removing the surface roughness component of the above by a low-pass filter.
4 is based on the height of the pedestal on which the sample is placed on the shape measuring laser microscope. In the line segment L, for example, when there is one peak (convex portion) and two valleys (concave portions) adjacent to it, the smallest MIN of the concave portion is used. When there are two peaks (convex parts), the maximum convex MAX is used.
As described above, the field of view of the height profile (length of L) is 1.0-1.4 mm, and the above-mentioned embossing can be sufficiently avoided during measurement.

The area ratio of the recesses on the surface is obtained by performing image analysis on the surface of the kitchen towel, considering dark portions below a predetermined threshold as recesses, and calculating the area ratio.
Specifically, the surface of the kitchen towel is captured as image data as shown in FIG. 5 with a commercially available image scanner (for example, Epson GT-X770), and a predetermined image analysis apparatus (for example, Nippon Paper Unitech) (“Easy Scan”))), the area ratio of the dark portion below a predetermined threshold value is obtained under the conditions of a resolution of 800 dpi and a scan area of 10 cm × 10 cm. Here, the above threshold is set to 98% close to the white side when black is 0 bits and white is 255 bits, and each dark part (shadow part) obtained is treated as particles (contamination). The particle diameter (equivalent circle diameter) (μm) is measured. Thereafter, for the particles having a particle size of 200 to 999 μm, the area of each particle was integrated and converted to the area ratio of the dark portion (recess) per 1 m ^{2 of} the image area (for example, particles having a measurement area of 0.010 m ^{2 and} 200 to 999 μm) If the integrated area is 1000mm2, the area ratio (%) is 1000mm2 ÷ 0.010m2 x 100 = 10.0%).
In measuring the area ratio, the kitchen towel sample is placed with one side of the kitchen towel along one side of the scanner so that no wrinkles, perforations, folds, etc. are in the sample, and image data is captured. Next, one side of the kitchen towel is rotated by 90 ° C. with respect to the scanner, and each image data is captured (a total of four image data). This operation is repeated twice, and a total of 8 pieces of image data are captured. Further, the same operation is repeated 8 times on the other surface of the kitchen towel sample. The 16 image data of the two surfaces (both sides) of the product thus obtained are subjected to the image analysis described above, the area ratio of the dark part (concave part) is measured, and the average value of these 16 area ratios Is adopted.
If the kitchen towel sample has perforations or folds, etc., and the 10 cm x 10 cm scan area (0.010 m2) cannot be secured, the measurement area measured at one time may be reduced. Increase the number of measurement points so that the measurement area is at least 0.010m2. For example, if 10 cm × 5 cm (0.005 m 2) is measured at two locations, the measurement area is 0.010 m 2.

When the height difference of the unevenness and the area ratio of the recesses are within the above ranges, moderate unevenness is generated on the surface of the kitchen towel, and oil is easily absorbed even if the basis weight is low.
On the other hand, if the height difference of the unevenness and the area ratio of the recesses are less than the above range, the surface unevenness of the kitchen towel becomes low and it becomes difficult to absorb the oil, and the oil absorption / basis weight is less than the above range.
If the height difference of the unevenness and the area ratio of the recesses exceed the above ranges, the kitchen towel may absorb too much oil, and the oil content of the food may be greatly different at the site in the food, impairing the taste.
In addition, as an example of the method of managing the height difference of the unevenness and the area ratio of the recessed portion within the above range, it is possible to press the uneven fabric described later against the wet paper web and perform unevenness simultaneously with dehydration.
In general, kitchen towels are often mechanically embossed after paper making in a process other than the paper machine (for example, a roll winder). Since the size of these embosses (the height difference of the unevenness and the period of the unevenness) is as large as several millimeters, the effect of improving the oil absorption speed and the amount of oil absorption hardly occurs.

Moreover, it is preferable that OIL-GMT / basis weight of a set of sheets is 0.1 to 0.5 N / 25 mm / (g / m ² ). When the OIL-GMT / basis weight is less than the above value, the oil is easily blurred when absorbed. When the OIL-GMT / basis weight exceeds the above value, the kitchen towel becomes hard or difficult to bend. The OIL-GMT / basis weight is more preferably 0.15 to 0.40 N / 25 mm / (g / m ² ).
OIL-GMT is measured and calculated as follows. First, in accordance with the measurement of the wet strength of the former JIS S3104, except for using the above-mentioned JAS standard food formulation oil instead of water, the longitudinal tensile strength OIL-MDT (Machine Direction Tensile strength) The transverse tensile strength OIL-CDT (Cross Direction Tensile strength) when wet is measured, and the square root of these products (OIL-MDT × OIL-CDT) ^1/2 (GMT: Geometric Tensile Strength) is calculated.

  The kitchen towel of the present invention is formed by stacking the above-described sheets one by one or by stacking two or more. For example, the kitchen towel can be formed into a roll shape that is slit to the product width, or a sheet shape that is cut into a product width and a length, respectively, and then folded in a C shape.

Next, the manufacturing method of the web which comprises the sheet | seat of the kitchen towel which concerns on embodiment of this invention is demonstrated using FIG. 1, FIG. FIG. 1 shows an example of a web manufacturing apparatus 50.
The apparatus 50 shown in FIG. 1 is a fabric press type paper machine, and can produce the web 103 with unevenness only by pressing means without using a ventilation drying (TAD) facility for preliminary dehydration. The apparatus 50 includes a wet part 2 for forming a continuous web, a press part 3 for dewatering the web to be patterned or uneven, and a drying part 4 for finally drying the web.

The wet section 2 forms a wet paper in the form of a crescent former, a head box 6 for supplying a stock made of fiber and water to the forming area, a forming felt 8 for dehydrating a part of the water of the web, and the forming. It has a wire 9, a plurality of guide rolls 10, and a forming roll 7.
The head box 6 discharges a paper jet at a molding portion 5 between the forming wire 9 and the forming felt 8. The forming wire 9 has an endless loop shape, travels around the plurality of guide rolls 10 and the forming roll 7, and contacts the forming felt 8 with the forming roll 7. Accordingly, the stock discharged to the position 5 is dehydrated by the forming wire 9 to form the fibrous web 101, and the fibrous web 101 is conveyed to the press unit 3 by the forming felt 8. The forming felt 8 is also in the form of an endless loop that travels around a plurality of guide rolls 18.
In addition, the shaping | molding part 5 can also be used as a suction breast roll former.

The press unit 3 includes a main press 11 and a textured fabric 14, and the main press 11 includes a first press element 12 and a second press element 13. The first and second pressing elements 12, 13 are pressed together to form a press nip N1 therebetween. In the example of FIG. 1, the main press 11 is a roll press and forms a twin roll in which the first and second pressing elements 12 and 13 face each other. The first press element (roll) 12 is located in the loop of the textured fabric 14, the second press element (roll) 13 is located in the forming felt 8 loop, and the forming felt 8 is formed at the press nip N1. And the uneven fabric 14 come into contact with each other. The main press 11 may be a long nip press or a shoe press (not shown).
The uneven fabric 14 has an endless loop shape and runs around a plurality of guide rolls 15 and a smooth transfer roll 16 facing the drying unit 4. The uneven fabric 14 contacts with the fibrous web 101 conveyed by the forming felt 8 through the press nip N1 of the main press 11 when traveling around the first press element (roll) 12. And in the press nip N1, the uneven | corrugated fabric 14 dehydrates and uneven | corrugates the fibrous web 101, and forms the uneven | corrugated fibrous web 102. FIG. The uneven fibrous web 102 is conveyed to the transfer roll 16 by the uneven fabric 14.
The transfer roll 16 faces a drying cylinder 19 of the drying unit 4 described later, and forms a transfer nip N2 therebetween. And the uneven | corrugated fibrous web 102 conveyed by the transfer nip N2 is provided only to drying, without performing press and spin-drying | dehydration.

In the press section 3 (press nip N1), the forming felt 8 functions as a water-receiving press felt 17 that is elastically deformable and compressible in the z-direction (thickness direction). The water-receiving press felt 17 immediately separates the textured fibrous web 102 that has passed through the press nip N1, and prevents the web 102 from being wetted again.
While passing through the press section 3, the dryness of each of the webs 101, 102 can be in the range of fiber concentration 15-30% to 42-52%.

The drying unit 4 includes a drying cylinder 19, a creping doctor 21, and a hood 22 that covers the drying cylinder 19. In the example of FIG. 1, the drying cylinder 19 is a Yankee dryer, but other types of drying units (for example, an air-through dryer or a metal drying belt) can be applied. Further, the drying unit may be a single drying unit (for example, one cylinder as shown in FIG. 1), or may be constituted by a plurality of drying units.
The surface of the drying cylinder 19 forms a drying surface 20 for drying the textured fibrous web 102 in the vicinity of the transfer nip N2. The creping doctor 21 is also disposed downstream of the drying surface 20 and crepes the concavo-convex fibrous web 102 dried by the drying surface 20, thereby providing a final web that has been both concavo-convex and creped. 103 is obtained. With crepe is a known method in which paper is mechanically compressed in the machine direction (machine running direction) to form a wavy crease called crepe, and the paper is bulky, soft and water-absorbing. , Imparts surface smoothness, aesthetics (crepe shape), etc.
Then, the uneven fibrous web 102 is transferred from the uneven fabric 14 to the drying surface 20 of the drying cylinder 19 at the transfer nip N2. The pressure in the transfer nip N2 is 1 MPa or less, and the web 102 does not dehydrate at this pressure.
In order to reliably transfer the web 102 from the uneven fabric 14 to the dry surface 20 side, an adhesive may be applied to the dry surface 20 by the spray device 23. The spray device 23 can be placed between the creping doctor 21 and the transfer nip N2 at a position where the drying surface 20 is open.

Examples of the uneven fabric 14 include a mesh-like wire in which metal or synthetic resin (plastic) wires are knitted in the vertical and horizontal directions as warps and wefts. As the number of the wires, the number of warps and wefts may be 20 to 60 / 2.54 cm, preferably 20 to 50 / 2.54 cm, and more preferably 20 to 40 / 2.54 cm. The wire diameter of the wire may be 0.25 to 0.80 mm, preferably 0.30 to 0.80 mm, more preferably 0.35 to 0.80 mm.
When the number of warps and wefts is less than the above range, or when the diameters of the warps and wefts exceed the above range, the unevenness of the surface of the uneven fabric 14 is too strong, and the unevenness of the surface of the kitchen towel is also strong. The height difference of the unevenness and the area ratio of the recesses may exceed the above range, the kitchen towel may easily absorb oil, and the oil content of the food may be greatly different between the front and back, which may impair the taste.
When the number of warps and wefts exceeds the above range, or when the diameters of the warp and weft are less than the above range, the unevenness of the surface of the uneven fabric 14 is too low, and the unevenness of the surface of the kitchen towel is also low. The height difference of the unevenness and the area ratio of the recesses are less than the above range, and the oil absorption / basis weight is less than the above range.
As a general fabric, the number of warps and wefts is about 70 to 200 / 2.54 cm, respectively. The diameters of the warp and the weft are about 0.08 to 0.20 mm.
The number of wires and the wire diameter shown above are the values of the top surface of the wire (surface on which the wet paper and the wire are in contact).

  In kitchen towel processing, the presence or absence of calendar processing, embossing, and the presence or absence of printing can be selected as appropriate.

  It goes without saying that the present invention is not limited to the above-described embodiments, and extends to various modifications and equivalents included in the spirit and scope of the present invention.

  As a web of one-ply and double-ply paper products having the pulp composition shown in Tables 1 and 2 (LBKP: NBKP = 50: 50 in mass%), a fabric press type paper machine 50 shown in FIG. Was used to produce a concavo-convex web 103. As the concavo-convex fabric 14, a mesh-like plastic wire knitted longitudinally and laterally as warps and wefts was used, and the numbers of warps and wefts and the wire diameters of the wires were defined as shown in Tables 1 and 2.

Furthermore, the final web was processed into one-sheet and two-sheet paper products, and the following evaluation was performed.
Basis weight: Measured based on JIS P8124 and converted per sheet set.
Thickness: Measured using a thickness gauge (a dial thickness gauge “PEACOCK” manufactured by Ozaki Seisakusho). The measurement conditions were a measurement load of 250 gf and a probe diameter of 30 mm. A sample was placed between the probe and the measurement table, and the gauge was read when the probe was lowered at a speed of 1 mm or less per second. One measurement was performed by stacking 10 samples, and the measurement was repeated 10 times and the measurement results were averaged.
Oil absorption, oil absorption rate, OIL GMT: As described above. As the JAS-standard food blended oil, the trade name “Nisshin Salad Oil” (B-type viscosity 49 mPa · s at 23 ° C.) manufactured by Nisshin Oillio Group was used.
Height difference of unevenness on the front and back surfaces of the kitchen towel and the area ratio of the recesses: measured as described above.
The basis weight, OIL GMT, and thickness were measured after maintaining the equilibrium state under the temperature and humidity conditions (23 ± 1 ° C., 50 ± 2% RH) specified in JIS-P8111.

  The obtained results are shown in Tables 1 and 2.

As is apparent from Tables 1 and ² , the basis weight is 15 to 50 g / m ² , the oil absorption amount / basis weight is 4.5 to 7.5 OIL-g / g, and the oil absorption rate is 2.0 to In each case of 100 seconds, a high oil absorption kitchen towel was obtained even if the basis weight was low.
In the case of each example, since a predetermined uneven fabric was pressed onto the wet paper web and the unevenness was performed at the same time as the dehydration, the average value of the height difference of the unevenness on the front and back surfaces was 100 to 600 μm. The average value of the area ratio of the recesses was 2 to 12%.
In the case of Example 7, in which the number of warps and wefts of the uneven fabric is maximized and the wire diameter is the thinnest, the unevenness on the surface of the kitchen towel is lower than in the other examples, and the unevenness of the unevenness and the recesses are reduced. Although the value of the area ratio is smaller than that of the other examples, there is no practical problem.
In Example 11 in which the number of warp and weft yarns of the uneven fabric was minimized and the wire diameter was the thickest, the unevenness on the surface of the kitchen towel was higher than in the other examples, the level difference of the unevenness and the area of the recesses Although the value of the rate is larger than that of the other examples, there is no practical problem.
Example 12 is a product obtained by calendering Example 4, and the level difference of the unevenness is reduced as compared with Example 4, but there is no practical problem.

On the other hand, in the case of Comparative Example 1 having a basis weight of less than 15 g / m ² , the oil absorption / basis weight was less than 4.5 OIL-g / g, the oil absorption rate exceeded 100 seconds, and the oil absorption was inferior.
In the case of Comparative Examples 2 and 3 in which the basis weight exceeded 50 g / m ² , the oil absorption / basis weight exceeded 7.5 OIL-g / g, and the oil absorbency was too high.
In the case of Comparative Example 4 in which the number of warps and wefts of the uneven fabric is larger than that in Example 7 and the wire diameter is smaller than that in Example 7, the unevenness on the surface of the kitchen towel becomes too low, the unevenness of the unevenness and The area ratio value was less than the above range, and the oil absorption / basis weight was less than 4.5 OIL-g / g, resulting in poor oil absorption.
In the case of Comparative Example 5 in which the number of warps and wefts of the uneven fabric is less than that of Example 11 and the wire diameter is thicker than that of Example 11, the unevenness on the surface of the kitchen towel becomes too high, and the unevenness of the unevenness The area ratio value exceeded the above range, and the oil absorption / basis weight was less than OIL-g / g, resulting in poor oil absorption.
In the case of Comparative Example 6 and Comparative Example 7 which are commercially available kitchen towels, both the height difference of the unevenness and the area ratio of the recessed part, or the height difference of the unevenness are outside the above range, and the oil absorption / basis weight is 4.5 OIL. Less than -g / g, the oil absorption was poor.

14 Concavity and convexity fabric 101 Fibrous web

In order to solve the above-mentioned problems, the kitchen towel of the present invention is mainly composed of pulp, and one or two or more sheets are stacked, and one basis weight is 15 to 50 g / m ² , and the oil absorption amount / tsubo. amount 4.5~7.5 OIL-g / g der is, when the length of the measurement field of view of a portion avoiding the embossed been to mechanical in the process other than the paper machine and 1.0-1.4Mm, surface height difference of the unevenness of 100～600Myuemu, the area ratio of the recesses of the surface Ru 2-12% der. However, the amount of oil absorption is a rectangular test piece with a side of 7.62 cm, which is taken from the one set of sheets of the kitchen towel in a vat with a depth of 1 cm of a food preparation oil standardized to JAS at a temperature of 23 ± 1 ° C. After the sample is immersed for 2 minutes, the test piece is measured from the change in mass when it is lifted from the bat and hung for 30 minutes.

The oil absorption rate is preferably 2.0 to 100.0 seconds. The oil absorption rate is measured according to the water absorption of the old JIS-S3104 method, except that the food preparation oil is used instead of water for the one set of sheets .

In order to solve the above-mentioned problems, the kitchen towel of the present invention is mainly composed of pulp, and one or two or more sheets are stacked, and one basis weight is 15 to 50 g / m ² , and the oil absorption amount / tsubo. Measurement field of a portion where the amount is 4.5 to 7.5 OIL-g / g and the specific volume is 8.1 to 21.9 cm ³ / g , and embossing performed mechanically in a process other than the paper machine is avoided. When the length of the surface is 1.0-1.4 mm, the surface area concave / convex area ratio is 100% to 600 μm and the area ratio of the concave portions on the surface is 2% to 12%. However, the amount of oil absorption is a rectangular test piece with a side of 7.62 cm, which is taken from the one set of sheets of the kitchen towel in a vat with a depth of 1 cm of a food preparation oil standardized to JAS at a temperature of 23 ± 1 ° C. After the sample is immersed for 2 minutes, the test piece is measured from the change in mass when it is lifted from the bat and hung for 30 minutes.

In order to solve the above-mentioned problems, the kitchen towel of the present invention is mainly composed of pulp, and one or two or more sheets are stacked, and one basis weight is 15 to 50 g / m ² , and the oil absorption amount / tsubo. The amount is 4.5 to 7.5 OIL-g / g , and when the length of the field of view to avoid embossing mechanically performed in a process other than the paper machine is 1.0-1.4 mm, height difference of unevenness 100～600Myuemu, the area ratio of the recesses of the surface was carried out under the conditions of the scan area 10 cm × 10 cm is Ri 2-12% der, ing apply the dry crepe. However, the amount of oil absorption is a rectangular test piece with a side of 7.62 cm, which is taken from the one set of sheets of the kitchen towel in a vat with a depth of 1 cm of a food preparation oil standardized to JAS at a temperature of 23 ± 1 ° C. After the sample is immersed for 2 minutes, the test piece is measured from the change in mass when it is lifted from the bat and hung for 30 minutes.

Claims (6)

Pulp is the main component, and one or more sheets are stacked, and one set of basis weight is 15 to 50 g / m ² , and oil absorption / basis weight is 4.5 to 7.5 OIL-g / g. Is a kitchen towel.
However, the amount of oil absorption is a rectangular test piece with a side of 7.62 cm, which is taken from the one set of sheets of the kitchen towel in a vat with a depth of 1 cm of a food preparation oil standardized to JAS at a temperature of 23 ± 1 ° C. After the sample is immersed for 2 minutes, the test piece is measured from the change in mass when it is lifted from the bat and hung for 30 minutes. The kitchen towel according to claim 1, wherein the oil absorption speed is 2.0 to 100.0 seconds.
The oil absorption rate is measured according to the water absorption rate of the old JIS-S3104 method except that the food preparation oil is used instead of water for the one set of sheets. The kitchen towel according to claim 1 or 2, wherein the unevenness of the surface unevenness is 100 to 600 µm. The kitchen towel according to any one of claims 1 to 3, wherein the area ratio of the recesses on the surface is 2 to 12%. OIL GMT = (OIL MDT × OIL CDT) ^1/2 which is the square root of the product of the tensile strength OIL MDT in the longitudinal direction when wet and the tensile strength OIL CDT in the transverse direction when wet according to the former JIS S3104 It is 0.1-0.5N / {25mmx (g / m < ² >)} per basic weight, The kitchen towel in any one of Claims 1-4.
However, OIL MDT and OIL CDT are performed based on the measurement of the wet strength of the old JIS S3104, except that the food preparation oil having a temperature of 23 ± 1 ° C. is used instead of water. A method for manufacturing a kitchen towel according to any one of claims 1 to 5, wherein the web is dried after pressing the uneven fabric to the wet paper web and performing unevenness simultaneously with dehydration. .