KR20010051748A - Kitchen paper and preparation method thereof - Google Patents

Abstract

PURPOSE: To obtain a kitchen paper having all of water absorbency, heat resistance, bulkiness, dry and wet strength and flexibility. CONSTITUTION: This kitchen paper comprises a sheet including natural fiber and thermoplastic fiber, has plural convexities on its surface and is characterized by that the thermoplastic fiber is not fused. This kitchen paper has bulkiness and is excellent in strength and flexibility.

Description

Kitchen paper and its manufacturing method {KITCHEN PAPER AND PREPARATION METHOD THEREOF}

The present invention relates to a disposable kitchen paper used in the kitchen and the like and a method for producing the same.

Conventionally, kitchen paper is used in a kitchen, a kitchen, etc. Kitchen paper is used, for example, to wipe dishes instead of dishcloths, or to wipe off seasoning droplets or food debris, which is useful for keeping hygiene around the kitchen. Kitchen paper is also used in the cooking process to drain vegetables or remove oil from frying. Therefore, the kitchen paper needs not only the strength at drying, but also the wet strength so that it can be wiped off in the wet state, and the absorbency is required to remove the moisture of vegetables. Heat resistance is necessary so that it does not deteriorate.

In addition, the kitchen paper needs a certain thickness in order to perform its function in operations such as wiping and removing oil. The present inventors have found that by using a spunlace nonwoven fabric having a specific configuration, it is possible to obtain a kitchen paper having excellent wet strength, water absorption and heat resistance. However, in order to obtain the thickness required as kitchen paper, the sheet basis weight which consists of the spunlace nonwoven fabric which combined pulp and PET was extended, and kitchen paper was formed as follows.

(result)

Pulp: PET, Finish Basis Weight, Finish Thickness

(g / m ² : g / m ² , g / m ² , mm)

① 27: 15, 40, 0.41

② 27: 20, 45, 0.42

③ 27: 25, 50, 0.46

④ 27: 30, 55, 0.45

Thus, even if it increased the basis weight, the thickness hardly changed, and it turned out that it is difficult to enlarge thickness by basis weight.

On the other hand, in order to give a feeling of thickness, there exists also the thing which provided the uneven | corrugated shape by performing embossing at high temperature on the sheet | seat containing a thermoplastic resin, and fusion bonding a thermoplastic fiber. MEANS TO SOLVE THE PROBLEM The present inventors formed the embossed kitchen paper in the spunlace nonwoven fabric of the basis weight 45 g / m <^2> which combined pulp and PET, and investigated the property, The following data were obtained regarding the strength of the kitchen paper. The embossed shape is a herringbone type with a convex height of 1.0 mm, a convex width of 1.0 mm, and a line pitch of 7.5 mm.

(result)

Emboss Temperature, Emboss Pressure, Tensile Strength (MD), Tensile Strength (CD)

(℃, MPa, N / 25cm, N / 25cm)

① 200, 2.9, 11.49, 1.95

② 190, 2.9, 15.72, 2.28

③ 180, 2.9, 22.48, 3.24

④ Room temperature, 0.0, 56.09, 6.82

In this way, it can be seen that the strengths of the MD and CD are extremely reduced in the kitchen papers 1 to 3 subjected to the embossing process as compared to the kitchen paper 4 without the embossing process. Thus, when embossing is given to the kitchen paper which consists of a spunlace nonwoven fabric in order to give a sense of thickness, intensity | strength falls and it becomes unbearable for a wiping operation | work. In addition, the kitchen paper requires flexibility in order to easily wrap or wipe the object, but the kitchen papers of 1 to 3 have low flexibility.

As mentioned above, kitchen paper which solves all the above problems of absorbency, heat resistance, thickness, dry and wet strength, and flexibility does not exist conventionally, and it is difficult to obtain such kitchen paper.

An object of the present invention is to provide a kitchen paper having a sense of thickness, dry and wet strength and flexibility, and a manufacturing method thereof.

1 is a partially enlarged view showing a first embodiment of a kitchen paper of the present invention.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1. FIG.

3 is a partially enlarged view showing a second embodiment of the kitchen paper of the present invention.

4 is a cross-sectional view taken along the line IV-IV of FIG. 3.

5 is a manufacturing process diagram of the kitchen paper of the present invention.

<Explanation of symbols for main parts of drawing>

1: kitchen paper

2, 2a: convex

3: concave line

3a: continuous line

7: maximum width of convex portion

8: height of convex portion

9: width of concave lines

10: pulp sheet

11: thermoplastic fiber

12: sheet

20: pulp sheet roll

21: departure box

22: water jet handler

23a, 23b: emboss roll

24: cutter

The present invention is a kitchen paper, wherein a plurality of convex portions are formed on a surface of a sheet containing natural fibers and thermoplastic fibers, and the thermoplastic fibers are not fused.

The kitchen paper of this invention has a thickness feeling by the several some convex contiguous part. This convex part is hard to be crushed and it is easy to maintain a shape. In addition, since thermoplastic fibers are included and these fibers are not fused, they are high in strength and rich in flexibility. Therefore, the kitchen paper of this invention is easy to use.

It is preferable that the said convex part is formed so that it may rise from the said line in the area | region enclosed by the line formed continuously along the sheet surface.

It is preferable that the mixing ratio of the said natural fiber and the said thermoplastic fiber is 90: 10-50: 50.

The kitchen paper is preferably a spunlace nonwoven fabric.

It is preferable that melting | fusing point of the said thermoplastic fiber is 200 degreeC or more. For example, the thermoplastic fiber is preferably polyethylene terephthalate fiber.

The basis weight is preferably 20 to 80 g / m ² .

It is preferable that the largest width dimension of the said convex part is 3.0 mm or more and 10.0 mm or less. Moreover, it is preferable that the elevation height of the said convex part from the back surface of the said sheet | seat is 0.5 mm or more and 5.0 mm or less. Moreover, it is preferable that the width | variety of the said line | wire is 0.1 mm or more and 1.0 mm or less.

Moreover, the kitchen paper of this invention is a process of (a) continuously unwinding the fibrous web of a thermoplastic fiber,

(b) unwinding and laminating paper pulp fibers onto the fibrous web,

(c) water-jetting the superimposed pulp fibers and the fibrous web to obtain a sheet,

(d) pressing the sheet under a temperature lower than the melting point of the thermoplastic fiber to form a plurality of convex portions on the sheet surface;

(e) removing the sheet to obtain individual kitchen paper

It can obtain by the manufacturing method of the kitchen paper characterized by having.

In the step (d), the pressing is preferably performed by compressing the sheet with a pair of emboss rolls, and at least one of the pair of emboss rolls is preferably a cotton roll or a paper roll.

Moreover, it is preferable to pressurize under 100 +/- 10 degreeC at the process of said (d).

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated with reference to drawings.

1 is a partially enlarged plan view showing a first embodiment of a kitchen paper of the present invention, and FIG. 2 is an enlarged cross-sectional view of the II-II line in FIG. 1.

In the kitchen paper 1 shown in FIG. 1 and FIG. 2, the convex part 2 is formed in the circular area | region formed so that it may be enclosed by the continuous concave line 3. As shown in FIG. As shown in FIG. 2, the convex portion 2 is formed to rise from the continuous concave line 3. As a result, as shown in FIG. 1, each of the convex portions 2 is a concave line 3. It is formed so as to be adjacent to each other with the gap therebetween. This convex portion 2 is formed over the entire surface of the surface of the kitchen paper 1.

Although the overall view of the kitchen paper is not shown, the kitchen paper is a rectangular or square sheet of, for example, about 150 to 800 mm × 150 to 800 mm. Hereinafter, the upper direction of FIG. 2 will be described as the front side and the lower direction as the back side.

The kitchen paper 1 is formed of natural fibers such as pulp, cotton, and rayon, and thermoplastic fibers such as polyethylene (PE), polypropylene (PP), and polyethylene terephthalate (PET). It does not interfere with the inclusion of fibers and the like. Among these, it is preferable to mix | blend a thermoplastic fiber in order to make pulp fiber soft, and to give softness to the kitchen paper 1, and to make it absorbent. In addition, when the blending ratio of natural fibers (preferably pulp fibers) and thermoplastic fibers is 90:10 to 50:50, appropriate water absorption and flexibility can be obtained.

In this case, it is preferable that a thermoplastic fiber uses melting | fusing point 200 degreeC or more. This is generally because the temperature immediately after frying or frying is about 180 to 200 ° C, so that the material of the kitchen paper does not deteriorate even when used for oil removal or the like. For example, PET fibers having a melting point of 255 to 260 ° C or 260 to 265 ° C may be used.

The kitchen paper 1 consists of overlapping the nonwoven fabric formed from the fiber web which mixed the above fibers, or the paper based on the pulp fiber, and the fiber web formed from the said thermoplastic fiber. Preferably, the kitchen paper 1 is comprised by the spunlace nonwoven fabric which water-jetted using the said natural fiber and said thermoplastic fiber. In this case, it is preferable to superimpose the papermaking pulp fiber on the fiber web of the thermoplastic fiber continuously unwound and perform a water jet process. The spunlace nonwoven fabric thus formed is soft and flexible and therefore easy to use as kitchen paper.

Moreover, since a spunlace nonwoven fabric is a manufacturing method suitable when a nonwoven fabric is formed using the fiber of short fiber length, it is preferable that the fiber length of the fiber to be used is about 2-100 mm. For example, it is preferable to use the fiber length of a pulp fiber about 2 mm or more and about 10 mm or less. Moreover, it is preferable that the fiber length of a thermoplastic fiber is 20 mm or more and 100 mm or less. More preferably, they are 32 mm or more and 70 mm or less.

The basis weight of that make up the kitchen paper (1) the sheet is preferably 20g / m ² at least 80 g / m ² or less in view of flexibility and strength. More preferably, they are 40 g / m <^2> or more and 60 g / m <^2> or less.

The kitchen paper of this invention can be obtained by pressurizing the sheet | seat obtained as mentioned above and embossing.

In the embossed shape of the kitchen paper 1 shown in FIG. 1, the convex part 2 is formed in the area | region enclosed by the continuous concave line 3, ie, the concave line 3 formed so as to draw an arc-shaped recessed part. have. As shown in FIG. 1, each convex part 2 is substantially circular when viewed from the surface side. And as can be seen from the cross section of FIG. 2, each convex part 2 protrudes to the surface side in semicircle shape, Furthermore, the convex part 2 is formed so that it may rise from the part of the said concave line 3. As shown in FIG. As a result, adjacent convex parts 2 approach each other in the state which interposes the said concave line 3, The convex part 2 is formed in the whole sheet | seat, and the convex part 2 and the convex part are formed. There is no flat portion between (2) or it is only formed at a very small area ratio. As a result, the whole kitchen paper 1 has the strength which is hard to be crushed in the thickness direction, and can express a feeling of thickness further. In addition, since this convex part is formed clearly, it can be set as an apparently beautiful thing.

In addition, as shown in FIG. 2, since the convex part 2 is formed in the substantially circular arc-shaped toward the surface side, when used for the removal of the oil of frying, the oil and kitchen paper absorbed by the kitchen paper The contact area of the food material placed on the top does not become large, so that the oil removal function is excellent.

It is preferable that the width | variety 9 of the concave line 3 (width dimension when it sees from the surface side) is 0.1 mm or more and 1.0 mm or less. If it is smaller than the said lower limit, when the recessed line 3 and the convex part 2 are formed under pressure, the intensity | strength will fall in the part of the said recessed line 3, and a sheet will become easy to tear. When larger than the said upper limit, the occupancy area ratio of the convex part 2 will fall, and the whole sheet will become easily crushed in the thickness direction, and it will be easy to lose the thickness feeling of kitchen paper.

It is preferable that the height (8: height dimension from a back surface) of the convex part 2 is 0.5 mm or more and 5.0 mm or less. When smaller than the said lower limit, a feeling of thickness is hardly expressed. When larger than the said upper limit, the damage given to the sheet | seat which comprises kitchen paper at the time of press-forming the convex part 2 is large, and a sheet | seat will be torn easily and a hole will become easy. Moreover, the height 8 of the convex part 2 becomes like this. More preferably, they are 1.0 mm or more and 3.0 mm or less.

It is preferable that the largest width | variety 7 of the convex part 2, for example, the diameter of the convex part 2 whose planar shape is circular is 3.0 mm or more and 10.0 mm or less. When smaller than the said lower limit, the height 8 of the convex part 2 will inevitably become low, and the thickness of kitchen paper will fall. In addition, the state of the convex part 2 becomes unclear. When larger than the said upper limit, it becomes difficult to maintain the shape of the convex part 2.

Moreover, in the embossing process for forming the said concave line 3 and the convex part 2, when kitchen paper contains a thermoplastic fiber, it is preferable that thermoplastic fibers and a thermoplastic fiber and a natural fiber do not fuse together. . When thermoplastic fibers fuse | melt by high temperature and high pressure embossing, the softness | flexibility of a sheet | seat will fall. In addition, by treating at high pressure, the pulp fibers hardly harden and the density increases, so that the absorbency of the kitchen paper decreases. In addition, since it is not thermally fused, the kitchen paper can absorb a relatively large amount of water or oil. Therefore, when used for wiping operations, for example, in a wet state, the convex portion 2 extends in a flat state and is likely to return to a flat shape. Therefore, when wiping off objects or the like in a wet state, the front surface of the wiping surface of the kitchen paper is in contact with the wiped surface, so that wiping marks are not generated.

In addition, the embossing shape (shape and arrangement | positioning of the convex part 2) implemented to the kitchen paper of this invention is not limited to what is shown in FIG. 3 is a partially enlarged plan view of a kitchen paper showing a second embodiment of the present invention, and FIG. 4 is an enlarged cross-sectional view of the IV-IV line in FIG. 3.

In the kitchen paper shown in FIG. 3, the substantially rectangular convex part 2a is provided in the front surface in the area | region enclosed by the continuous line 3a. Also in this case, as shown in FIG. 4, the convex part 2a rises from the part of the continuous line 3a, and the convex parts 2a adjoin and adjoin through the continuous line 3a. As a result, the area ratio which the convex part 2a occupies becomes high, the intensity | strength of the whole becomes high, and thickness feeling can be expressed reliably.

The convex part in this invention can also take shapes, such as a polygon, in addition to a circle | round | yen or a rectangle. However, in any form, the convex portion needs to be formed to rise from the line in the region surrounded by the continuous line. In addition, between the convex part and the convex part, even if a flat part is not formed other than a continuous line or is formed, the area ratio is smaller than the area ratio occupied by the convex part, and the area rate of the flat part is occupied by the convex part. Is preferably 1/3 or less, more preferably 1/4 or less.

Next, the manufacturing method of the said kitchen paper 1 is demonstrated. 5 is a manufacturing process chart of the kitchen paper of the present invention. As shown in FIG. 5, first, the thermoplastic fiber 11 is shaken out from the starting box 21, becomes a web shape, and is sent to the conveyance direction MD by the conveying means not shown. On the thermoplastic fiber 11, the pulp sheet 10 overlaps with the paper pulp sheet roll 20. Thereafter, the pulp sheet 10 and the web of the thermoplastic fibers 11 are combined with the water jet processor 22 to form a sheet 12 (spunlace nonwoven fabric). In addition, the water jet treatment conditions are appropriately adjusted.

The sheet 12 is sandwiched between the emboss rolls 23a and 23b and pressed to form a continuous concave line and a convex portion in the sheet 12. At this time, the embossing is performed at a temperature lower than the melting point of the thermoplastic resin, for example, at room temperature. For this reason, since a thermoplastic resin does not melt and fuse as mentioned above, a sheet | seat does not become hard and the strength of a sheet | seat does not fall. However, when embossing is performed by the roll heated at about 100 degreeC, since pulp fiber hydrogen bonds and the embossing shape is provided reliably, it is preferable. In addition, although the pressurization conditions of embossing differ according to a conveyance speed and tension | tensile_strength, a linear pressure is about 2.0-14.5 MPa.

In addition, it is preferable that an embossing roll uses a paper roll or a cotton roll. Although a rubber roll can also be used, it is unsuitable in terms of durability in forming the recessed part or convex part like this invention. In addition, in this invention, embossing is not limited to a roll, You may use a pressure plate.

After the embossing is formed as described above, the cutter paper 24 is separately divided to obtain the kitchen paper 1 of the present invention.

Although the kitchen paper of this invention has a feeling of thickness, even one sheet is excellent in usability enough, but in order to further increase thickness and intensity | strength, two or more sheets can be used.

Hereinafter, although an Example demonstrates this invention still in detail, this invention is not limited to these Examples.

As the kitchen paper of this invention, the kitchen paper which gave the embossing shape shown to FIG. 1 and FIG. 2 was manufactured in the process of FIG. Kitchen paper consists of PET fiber (fiber length about 44 mm, fiber diameter 1.56 dtex, addition amount 17 g / m ² , melting point 260 to 265 ° C.), and pulp fiber (fiber length about 2 mm, fiber diameter 5.9 to 23.6 μm, addition amount 30 in g / m ²⁾ spun-laced non-woven fabric (basis weight 45 g / m ²⁾ was formed by using a composed subjected to emboss processing. The embossing process was performed at 4.9 MPa of linear pressure with the upper roll 23a with the steel roll, and the lower 23b with the paper roll. Moreover, the embossed shape was 9 = 1.0 mm in width of the concave line 3, 8 = 2.2 mm in height of the convex part 2, and 7 = 5.0 mm in the maximum width of the convex part 2. About the obtained kitchen paper, thickness, dry tensile strength, wet tensile strength, and also the absorptivity and oil absorption amount were measured.

Tensile strength It measured using the constant speed elongation type tensile tester. The test member is W25 mm × L150 mm. Tensile velocity is 100 mm / min and chuck spacing is 100 mm. In addition, the wet conditions used the test member which impregnated 200 mass% of tap water with respect to the test member weight.

(Lummary) It measured using the cantilever type test apparatus. The test member is W25 mm × L150 mm.

In addition, the product using only pulp as a comparative example is as follows. Comparative Example 1: Commercially available kitchen paper formed of a pulp airlaid nonwoven fabric. Comparative Example 2: Commercially available kitchen paper in which two pulp sheets were stacked (with embossing). The comparative example was tested similarly to the Example. Table 1 shows the results of measurement of the sheet before the embossing process and the examples and comparative examples of the present invention after the embossing process.

Example Comparative Example 1 Comparative Example 2 Before embossing After embossing Basis weight g / ㎡ 47.97 51.74 41.11 42.62 Apparent thickness Mm 0.33 1.62 1.19 0.46 Dry tensile strength N / 25mm MD 53.52 46.29 3.50 14.16 CD 16.09 15.44 2.44 3.20 Wet tensile strength N / 25mm MD 49.31 43.11 1.05 3.36 CD 12.98 13.85 0.96 0.93 Lecture Mm MD 75 57 89 56 CD 25 34 62 49 Absorption amount g / ㎡ 407 537 1287 253 Oil absorption g / ㎡ 353 561 957 306

As can be seen from the results, in the kitchen paper of the present invention, the apparent thickness (thickness) is increased without reducing the strength and the stiffness.

As described above, according to the embossed shape in the present invention, the kitchen paper can be effectively provided with a sense of thickness, and the embossed shape is clearly maintained. Therefore, it can be seen as a beautiful thing.

In the present invention, since the embossed shape is clearly maintained, when the kitchen paper of the present invention is used, for example, for removing oil, the contact area between the oil absorbed in the kitchen paper and the food material does not increase, and the oil once absorbed is again food. There is little return to the material. In addition, water vapor and the like generated from the heated food material can be effectively removed.

Moreover, in the kitchen paper of this invention, although thermoplastic fiber is mix | blended in order to raise intensity | strength and flexibility, in the embossing shape of this invention, even after embossing, the strength and flexibility by thermoplastic fiber are not impaired.

Claims (13)

A plurality of convex portions are formed on the surface of a sheet containing natural fibers and thermoplastic fibers, and the thermoplastic paper is not fused. The kitchen paper according to claim 1, wherein the convex portion is formed to rise from the line in a region surrounded by lines continuously formed along the sheet surface. The kitchen paper according to claim 1 or 2, wherein the mixing ratio of the natural fiber and the thermoplastic fiber is 90:10 to 50:50. The kitchen paper according to any one of claims 1 to 3, which is a spunlace nonwoven fabric. The kitchen paper according to any one of claims 1 to 4, wherein the thermoplastic fiber has a melting point of 200 ° C or higher. The kitchen paper according to any one of claims 1 to 5, wherein the thermoplastic fiber is polyethylene terephthalate fiber. The kitchen paper according to any one of claims 1 to 6, wherein the basis weight is 20 to 80 g / m ² . The kitchen paper according to any one of claims 1 to 7, wherein the maximum width dimension of the convex portion is 3.0 mm or more and 10.0 mm or less. The height of the raised part of the said convex part from the back surface of the said sheet | seat is 0.5 mm or more and 5.0 mm or less, The kitchen paper of any one of Claims 1-8 characterized by the above-mentioned. The kitchen paper according to any one of claims 1 to 9, wherein the width of the line is 0.1 mm or more and 1.0 mm or less. (a) continuously unwinding the fibrous web of thermoplastic fibers, (b) unwinding and laminating papermaking pulp fibers onto the fibrous web, (c) water-jetting the superimposed pulp fibers and the fibrous web to obtain a sheet, (d) pressing the sheet under a temperature lower than the melting point of the thermoplastic fiber to form a plurality of convex portions on the sheet surface; (e) A process for producing kitchen paper, comprising the step of separating the sheet to obtain individual kitchen paper. 12. The kitchen according to claim 11, wherein in the step (d), the pressing is performed by compressing the sheet with a pair of emboss rolls, and at least one of the pair of emboss rolls is a cotton roll or a paper roll. Method of manufacturing paper. The process for producing a kitchen paper according to claim 11 or 12, wherein the step (d) is pressurized at 100 ± 10 ° C.