Crepe paper and method for manufacturing the same

Abstract

To provide crepe paper with improved absorbency in the MD direction. [Solution] A crepe paper having a plurality of ridges extending in the MD direction, wherein the ridges are made of paper material and the width / spacing ratio of the ridges is 0.55 or less.

Description

Technical Field

[0001] The present invention relates to crepe paper with improved absorbency and a method for producing the same.

Background Art

[0002] Conventionally, as a sheet for packaging, placing, or storing foods such as meat and preventing or reducing quality deterioration due to oxidation of the food, etc., a sheet excellent in absorbency of a liquid containing blood exuded from meat, etc. (hereinafter referred to as "drip") has been demanded, and crepe paper has been proposed as such a sheet (Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In crepe paper, a large number of wrinkles (referred to as "crepe") extending in a direction orthogonal to the paper's flow direction (hereinafter referred to as the "MD direction") (hereinafter referred to as the "CD direction") are formed. Therefore, the absorption rate of the drip is faster in the CD direction and slower in the MD direction. That is, the absorbency of crepe paper is relatively low in the MD direction and relatively high in the CD direction.

[0005] Therefore, when the drip absorbed by the crepe paper reaches both ends in the CD direction, there is a risk that the drip will leak out of the crepe paper. In that case, even if the MD direction is unused, the crepe paper will have to be replaced with a new one, resulting in a decrease in economic efficiency.

[0006] An object of the present invention is to provide crepe paper with improved absorbency in the MD direction.

Means for Solving the Problems

[0007] As a result of diligent research, the inventors have discovered that by manufacturing crepe paper having multiple protrusions extending in the MD direction, it is possible to provide crepe paper with improved absorbency in the MD direction, and thus completed the present invention.

[0008] A first aspect of the present invention is: A crepe paper having multiple ridges extending in the MD direction, The aforementioned protrusion is made of paper, This invention relates to crepe paper in which the ratio of the width / spacing of the aforementioned protrusions is 0.55 or less.

[0009] The ratio of the width to the spacing of the protrusions refers to the value of (width) divided by (spacing) of the protrusions.

[0010] It is preferable that the width of the aforementioned protrusion is 1800 μm or less.

[0011] The spacing between the aforementioned protrusions is preferably 1500 μm to 7000 μm.

[0012] The basis weight of the crepe paper of this invention is 20 g / m². 2 ~60g / m 2 It is preferable that this be the case.

[0013] The crepe content of the crepe paper of the present invention is preferably 5% to 50%.

[0014] The crepe paper of the present invention is preferably sanitary paper.

[0015] The crepe paper of the present invention is preferably used for packaging, placing, or preserving food.

[0016] A second aspect of the present invention is: A process of drying wet paper on the surface of a rotating cylindrical dryer to form a paper body. The process of peeling the paper body from the surface of the cylindrical dryer using a doctor blade. A method for manufacturing crepe paper comprising: The doctor blade has a blade surface that contacts or is close to the surface of the cylindrical dryer, the blade surface of the doctor blade has a plurality of grooves extending in the MD direction of the paper body, relating to a method for manufacturing crepe paper, wherein the ratio of the groove width to the groove pitch of the groove is 0.55 or less.

[0017] The ratio of the groove width to the groove pitch of the groove means the value of (length of the groove width) ÷ (length of the groove pitch).

[0018] Preferably, the groove width of the groove is 1800 μm or less.

[0019] Preferably, the groove pitch of the groove is 1500 μm to 7000 μm.

[0020] Preferably, the crepe rate in the method for manufacturing crepe paper of the present invention is 5% to 50%.

Effects of the Invention

[0021] According to the present invention, it is possible to provide crepe paper with improved absorbency in the MD direction.

[0022] The crepe paper of the present invention has improved absorbency in the MD direction and can have high absorbency not only in the CD direction but also in the MD direction.

[0023] Therefore, the crepe paper of the present invention can have high water absorbency and / or water retention. <\

[0024] The method for manufacturing crepe paper of the present invention can manufacture crepe paper with improved absorbency in the MD direction.

[0025] The method for manufacturing crepe paper of the present invention has improved absorbency in the MD direction and can manufacture crepe paper having high absorbency not only in the CD direction but also in the MD direction.

[0026] Therefore, the method for producing crepe paper of the present invention can produce crepe paper having high water absorption and / or water retention properties. [Brief explanation of the drawing]

[0027] [Figure 1] A schematic enlarged cross-sectional view showing one embodiment of the crepe paper of the present invention. [Figure 2] A schematic cross-sectional view showing one embodiment of the method for manufacturing crepe paper according to the present invention. [Figure 3] Figure 2 shows an enlarged cross-sectional view of the portion where the doctor blade 2 is in contact with or close to the surface of the Yankee dryer 3. [Figure 4] A schematic enlarged cross-sectional view showing one embodiment of the cutting surface of a doctor blade in the manufacturing method of the present invention. [Figure 5] A diagram showing the correspondence between the grooves on the blade surface and the ridges on the crepe paper. [Modes for carrying out the invention]

[0028] [First aspect] A first aspect of the present invention is: A crepe paper having multiple ridges extending in the MD direction, The aforementioned protrusion is made of paper, The crepe paper has a width / spacing ratio of ridges of 0.55 or less.

[0029] The fibrous materials that make up crepe paper are not particularly limited and can include natural fibers such as cotton, wood pulp, and wool; regenerated fibers such as rayon; and synthetic fibers made from synthetic polymers such as vinylon, nylon, polyester, polyethylene, polypropylene, and acrylic. Natural fibers are preferred, and cellulose fibers are more preferred. These fibers may be used individually, or they may be mixed or compounded.

[0030] As the fibrous material constituting the crepe paper, wood pulp is preferred, and virgin wood pulp, recycled paper pulp, or mixtures thereof can be used. As wood pulp, for example, softwood pulp such as NBKP (bleached softwood kraft pulp) and NUKP (unbleached softwood pulp), hardwood pulp such as LBKP (bleached hardwood kraft pulp) and LUKP (unbleached hardwood pulp), and mixtures of softwood pulp and hardwood pulp can be used.

[0031] The crepe paper of the first aspect of the present invention has numerous wrinkles extending in the CD direction, as is seen in ordinary crepe paper.

[0032] Furthermore, the crepe paper according to the first embodiment of the present invention has a plurality of protrusions extending in the MD direction.

[0033] In this invention, "ridges" refer to elongated protrusions, which in the crepe paper of the first embodiment of this invention extend in the MD direction. Therefore, the "ridges" of the crepe paper of the first embodiment of this invention are different from the numerous wrinkles that crepe paper usually has, which extend in the CD direction. The "ridges" may be continuous or discontinuous in the MD direction.

[0034] The ridges of the crepe paper in the first aspect of the present invention are made of a paper body. That is, in the crepe paper of the present invention, the ridges are formed from a paper body. In the present invention, "paper body" means an object made of the materials that constitute paper, and is usually in the form of a sheet. The "paper body" can be formed from paper stock. The "ridges" of the crepe paper in the first aspect of the present invention are not made of resin.

[0035] The aforementioned paper pulp may contain various additives in addition to the fiber material described above. Examples of additives include softeners, bulking agents, dyes, dispersants, wet strength enhancers, dry strength enhancers, water filtration enhancers, pitch control agents, yield enhancers, and the like.

[0036] Preferably, the ridges are made from the same raw material as the crepe paper. That is, in the crepe paper of the first embodiment of the present invention, it is preferable that the ridges are manufactured from the same raw material as that which constitutes the crepe paper. To put it another way, it is preferable that the ridges are made from the same material as the crepe paper, or are integral to the crepe paper.

[0037] The ratio of the width / spacing of the ridges in the crepe paper according to the first embodiment of the present invention is 0.55 or less. Crepe paper with a ridge width / spacing ratio exceeding 0.55 is difficult to manufacture.

[0038] Figure 1 shows one embodiment of the crepe paper of the present invention.

[0039] Figure 1 is a schematic enlarged cross-sectional view of the crepe paper 1 of the present invention in the CD direction, and the crepe paper 1 has a plurality of spaced-apart protrusions 11, 11 extending in the MD direction. Although only two protrusions 11, 11 are shown in Figure 1, there are many more protrusions in the CD direction of the crepe paper 1 that are not shown.

[0040] The protrusions 11,11 shown in Figure 1 each have a width (W), and the protrusions 11,11 are spaced apart (M).

[0041] The "width" (W) of the protrusion 11 refers to the width of the base of the protrusion 11, and can be determined, for example, by microscopic observation. If the width of the protrusion 11 varies slightly along the MD direction of the crepe paper 1, the widths of five points spaced evenly along the length of the protrusion 11 may be measured on the microscope image, and the average value may be taken as the "width".

[0042] The "spacing" (M) between the ridges 11-11 refers to the distance between the tops of the ridges 11-11, and can be determined, for example, by microscopic observation. If the spacing between the ridges 11-11 varies slightly along the MD direction of the crepe paper 1, the spacing between five points spaced evenly along the length of the ridges 11-11 may be measured on the microscope image, and the average value of these measurements may be taken as the "spacing".

[0043] In the embodiment shown in Figure 1, grooves (hereinafter referred to as "vertical grooves") exist on the surface (back surface) of the crepe paper 1 opposite to the surface where the protrusions 11,11 are located, at positions corresponding to the protrusions 11,11. The vertical grooves extend along the MD direction of the crepe paper 1, and the cross-sectional shape of the vertical grooves corresponds to the cross-sectional shape of the protrusions 11,11.

[0044] While longitudinal grooves are not essential in the crepe paper of the present invention, their presence is preferable to further enhance absorbency in the MD direction. Furthermore, in the formation of ridges in the manufacturing of the crepe paper of the present invention, as described later, the formation of ridges with longitudinal grooves is easier.

[0045] In the first aspect of the present invention, the ratio of the width (W) to the spacing (M) of the ridges of the crepe paper (W / M) is preferably 0.54 or less, more preferably 0.53 or less, even more preferably 0.52 or less, and particularly preferably 0.51 or less.

[0046] In the first aspect of the present invention, the ratio of the width (W) to the spacing (M) of the ridges of the crepe paper (W / M) is preferably 0.1 or more, more preferably 0.2 or more, and even more preferably 0.3 or more.

[0047] The width (W) of the ridges of the crepe paper in the first aspect of the present invention is preferably 1800 μm or less, more preferably 1600 μm or less, and even more preferably 1400 μm or less.

[0048] The width (W) of the ridges in the crepe paper of the first embodiment of the present invention is preferably 400 μm or more, more preferably 500 μm or more, and even more preferably 600 μm or more.

[0049] In the first aspect of the present invention, the spacing (M) of the ridges in the crepe paper is preferably in the range of 1500 μm to 7000 μm, more preferably in the range of 2000 μm to 5000 μm, and even more preferably in the range of 2000 μm to 3000 μm.

[0050] The crepe paper of this invention is 20 g / m² 2 ~60g / m 2It is preferable that the paper has a basis weight (measurement method: JIS P 8124

[2011] ). The basis weight of the crepe paper is 25 g / m². 2 ~50g / m 2 Preferably, 30 g / m 2 ~40g / m 2 This is preferable.

[0051] The crepe ratio of the crepe paper of the present invention is preferably 5% to 50%. In the present invention, "crepe ratio" is a characteristic that represents the degree of crepe formation, defined based on the speed difference between a cylindrical dryer such as a Yankee dryer and a reel, as described later, and is defined by the following formula. Crepe percentage (%) = (Movement speed of cylindrical dryer (m / min) - Reel speed (m / min)) / Reel speed (m / min) × 100

[0052] To improve the absorbency of the crepe paper of the present invention in the CD direction, the crepe ratio can be increased to form more wrinkles along the CD direction. However, increasing the crepe ratio makes the crepe paper more prone to stretching in the MD direction, which reduces its tearability (ease of cutting the crepe paper in the CD direction) and decreases productivity. Therefore, it is undesirable to increase the crepe ratio excessively. Accordingly, the crepe ratio of the crepe paper of the present invention is more preferably 5% to 40%, even more preferably 5% to 30%, and particularly preferably 5% to 20%.

[0053] Since the crepe paper of the present invention has multiple ridges in the MD direction, liquids that come into contact with the crepe paper are guided not only by the numerous wrinkles extending in the CD direction, but also along the multiple ridges extending in the MD direction, and are efficiently absorbed throughout the crepe paper.

[0054] As a result, when liquids such as drips are absorbed using the crepe paper of the present invention, the unused portion in the MD direction is reduced, which reduces the frequency of replacement and improves economic efficiency. Therefore, the crepe paper of the present invention can be suitably used for absorbing liquids such as drips.

[0055] Thus, since the crepe paper of the present invention has excellent absorbency not only in the CD direction but also in the MD direction, the crepe paper of the present invention can have high water absorption and / or water retention.

[0056] It is preferable to use the crepe paper of the present invention as sanitary paper. Sanitary paper is paper used for the purpose of improving hygiene, and examples include disposable papers such as tissue paper (also called face wipes or cosmetic paper), toilet paper, paper towels (kitchen paper, etc.), toilet paper, and wadding (paper cotton) (see, for example, the Paper and Pulp Technology Handbook, 5th edition, page 459, published January 30, 1992, edited and published by the Japan Paper and Pulp Technology Association). Sanitary paper is also called sanitary paper (JIS P0001:1998).

[0057] As sanitary paper, paper towels such as kitchen paper are preferred. Kitchen paper (including cooking paper) is mainly used in the kitchen for purposes such as draining water and oil from meat, fish, and vegetables; as a placemat for cutting boards; wiping dishes; wiping oil from frying pans; cleaning gas ranges and range hoods; and wiping up spills on dining tables.

[0058] Sanitary paper is porous and has the ability to absorb liquids. Examples of liquids include water and oil. The crepe paper of the present invention possesses not only water absorption but also oil absorption, making it suitable for use in kitchens, for example.

[0059] The form of the sanitary paper is not particularly limited and may be in the form of a roll wound from a long length of paper, or in a non-roll form. In the non-roll form, it is more preferable that the flat sanitary paper is folded and placed inside a packaging bag. The sanitary paper may be used in the form of a single sheet (so-called 1-ply) folded in half, or in the form of a set of two sheets (so-called 2-ply) or three or more sheets (so-called 3-ply) of laminated structure folded in half and used in the same way as a single sheet.

[0060] [Second aspect] A second aspect of the present invention is: A process of drying wet paper on the surface of a rotating cylindrical dryer to form a paper body. The process of peeling the paper body from the surface of the cylindrical dryer using a doctor blade. A method for manufacturing crepe paper comprising: The doctor blade has a blade surface that contacts or is in close proximity to the surface of the cylindrical dryer. The blade surface of the doctor blade has a plurality of grooves extending in the MD direction of the paper body, This is a method for manufacturing crepe paper, wherein the ratio of groove width to groove spacing of the grooves is 0.55 or less.

[0061] The wet paper used in the crepe paper manufacturing method of the present invention can be prepared by wet papermaking using a conventional paper machine with a paper stock containing fibrous material such as pulp.

[0062] In the method for manufacturing crepe paper of the present invention, the step of drying wet paper on the surface of a rotating cylindrical dryer to form a paper body can be carried out, for example, by pressing wet paper onto the surface of a heated cylindrical Yankee dryer with a roll or the like to adhere it, and then drying the wet paper on the surface of the Yankee dryer while rotating the Yankee dryer to form a paper body.

[0063] A Yankee dryer is not particularly limited, but for example, it can use a metal drum equipped with a heating mechanism, and the outer diameter of the drum can be between 1m and 5m.

[0064] In the method for manufacturing crepe paper of the present invention, the term "paper body" has the same meaning as the term "paper body" in the crepe paper of the present invention, and is usually in the form of a sheet.

[0065] The degree of drying of the paper can be set as appropriate; it may be completely dry or not yet completely dry.

[0066] In the method for manufacturing crepe paper of the present invention, the step of peeling the paper body from the surface of a cylindrical dryer with a doctor blade can be carried out, for example, by bringing the blade surface of the doctor blade into contact with or close to the surface of the Yankee dryer and peeling the paper body away from the surface of the Yankee dryer.

[0067] The above process makes it possible to manufacture crepe paper having multiple ridges extending in the MD direction. The ridges consist of the paper body, and it is preferable that the ratio of the width to the spacing of the ridges is 0.55 or less.

[0068] Figure 2 shows one embodiment of the method for manufacturing crepe paper according to the present invention.

[0069] In the schematic cross-sectional view of Figure 2, wet paper 1' is pressed and adhered to the surface of a heated cylindrical Yankee dryer 3 by a press roll 4, and the wet paper 1' is dried on the rotating surface of the Yankee dryer 3 to form a sheet of paper. Then, the doctor blade 2 is brought into contact with or close to the surface of the Yankee dryer 3 to peel the dried sheet of paper from the surface of the Yankee dryer 3, thereby producing crepe paper 1.

[0070] The crepe paper 1 shown in Figure 2 is wound onto a reel (a roll for winding the crepe paper 1), which is not shown. The crepeness of the crepe paper 1 can be controlled by controlling the rotation speed of the Yankee dryer 3 and the rotation speed of the reel. In the crepe paper manufacturing method of the present invention, the crepeness is preferably 5% to 50%, more preferably 5% to 40%, even more preferably 5% to 30%, and particularly preferably 5% to 20%.

[0071] Figure 3 shows an enlarged cross-section of the portion of the doctor blade 2 that is in contact with or in close proximity to the surface of the Yankee dryer 3, as shown in Figure 2.

[0072] In the example shown in Figure 3, the tip of the plate-shaped doctor blade 2 contacts or approaches the surface of the Yankee dryer 3. The tip of the doctor blade 2 is pre-shaved to a predetermined angle, forming a flat blade surface 21 with a predetermined area. Therefore, when the tip of the doctor blade 2 contacts or approaches the surface of the Yankee dryer 3, the blade surface 21 at the tip contacts or approaches the surface of the Yankee dryer 3. By the flat blade surface 21 contacting or approaching the surface of the Yankee dryer 3, the sheet-like paper material can be easily peeled from the surface of the Yankee dryer 3.

[0073] When a sheet of paper is peeled from the surface of the Yankee dryer 3 by the doctor blade 2, the paper is immediately creped, forming numerous wrinkles that extend in the CD direction (the axis of rotation of the Yankee dryer 3), and becoming crepe paper 1.

[0074] In the method for manufacturing crepe paper according to the present invention, the blade surface of the doctor blade that is in contact with or in close proximity to the surface of the cylindrical dryer is provided with a plurality of grooves that extend in the MD direction of the paper body.

[0075] In the example shown in Figure 3, multiple grooves extending in the MD direction (the rotation direction of the Yankee dryer 3) of the sheet-like paper material are formed on the cutting surface 21 at the tip of the doctor blade 2.

[0076] Figure 4 shows one embodiment of the grooves on the blade surface of a doctor's blade.

[0077] Figure 4 is a schematic enlarged cross-sectional view of the blade surface of the doctor blade as seen from the CD direction, and the blade surface 21 has multiple spaced grooves 22-22. Although only two grooves 22-22 are shown in Figure 4, there are many other grooves in the CD direction of the blade surface 21 that are not shown.

[0078] The grooves 22-22 shown in Figure 4 each have a groove width (L) and groove depth (K), and the grooves 22-22 exist at their bases with a pitch (D) between them. M in Figure 4 is the groove spacing, which means the distance between the deepest parts of the grooves. The groove spacing (M) of grooves 22-22 is the same as the spacing (M) of the ridges 11-11 of the crepe paper 1 (see Figure 1).

[0079] The cross-sectional shape of the groove is not particularly limited; it may be V-shaped as shown in Figure 4, or it may be concave. In other words, the deepest part of the groove may be a point or a plane.

[0080] When the groove shape is V-shaped as shown in Figure 4, the angle formed by the deepest part is preferably 90 to 150 degrees, more preferably 100 to 140 degrees, and even more preferably 110 to 130 degrees.

[0081] In the method for manufacturing crepe paper of the present invention, by using a doctor blade equipped with a blade surface having multiple grooves extending in the MD direction of the paper body, it is possible to manufacture crepe paper having multiple ridges extending in the MD direction.

[0082] In the embodiment shown in Figure 4, the ridges 11 of the crepe paper 1 are formed in accordance with the shape of the grooves 22,22 of the blade surface 21. The correspondence between the grooves 22 of the blade surface 21 and the ridges 11 of the crepe paper 1 is shown in Figure 5. The width of the grooves 22 is slightly wider than the width of the ridges 11. That is, the width of the ridges 11 is slightly narrower than the width of the grooves 22.

[0083] When using a doctor blade with a cutting surface having multiple grooves extending in the MD direction of the paper body, as shown in Figure 5, longitudinal grooves are formed on the surface (back side) of the crepe paper 1 opposite to the surface where the protrusions 11 are located, at positions corresponding to the protrusions 11. The longitudinal grooves extend along the MD direction of the crepe paper 1, and the cross-sectional shape of the longitudinal grooves corresponds to the cross-sectional shape of the protrusions 11.

[0084] While longitudinal grooves are not necessarily required in the crepe paper of the present invention, their presence is preferable to further enhance absorbency in the MD direction. Furthermore, forming ridges with longitudinal grooves is easier because the ridges can be efficiently formed using a doctor blade equipped with a blade surface having multiple grooves extending in the MD direction of the paper body.

[0085] In the second aspect of the present invention, the ratio of groove width (L) to groove spacing (M) of the grooves on the blade surface of the doctor blade (L / M) is 0.55 or less. If the ratio of groove width (L) to groove spacing (M) exceeds 0.55, the area of ​​the region where the blade surface of the doctor blade contacts or is close to the cylindrical dryer becomes smaller, making it difficult to peel the sheet-like paper from the surface of the cylindrical dryer, and thus making it difficult to manufacture crepe paper.

[0086] In the second aspect of the present invention, the ratio of groove width (L) to groove spacing (M) of the grooves on the blade surface of the doctor blade (L / M) is preferably 0.54 or less, more preferably 0.53 or less, even more preferably 0.52 or less, and particularly preferably 0.51 or less.

[0087] In the second aspect of the present invention, the ratio of groove width (L) to groove spacing (M) of the grooves on the blade surface of the doctor blade (L / M) is preferably 0.1 or greater, more preferably 0.2 or greater, and even more preferably 0.3 or greater.

[0088] The groove width (L) of the groove on the blade surface of the doctor blade used in the second aspect of the present invention is preferably 1800 μm or less, more preferably 1600 μm or less, and even more preferably 1400 μm or less.

[0089] The groove width (L) of the groove on the blade surface of the doctor blade used in the second aspect of the present invention is preferably 400 μm or more, more preferably 500 μm or more, and even more preferably 600 μm or more.

[0090] In the second aspect of the present invention, the groove spacing (M) of the grooves on the blade surface of the doctor blade is preferably in the range of 1500 μm to 7000 μm, more preferably in the range of 2000 μm to 5000 μm, and even more preferably in the range of 2000 μm to 3000 μm.

[0091] In the second aspect of the present invention, the ratio of groove width (L) to pitch (D) of the grooves on the blade surface of the doctor blade is preferably 1.2 or less. The ratio of groove width (L) to pitch (D) means the value of (length of groove width (L)) ÷ (length of pitch (D)). If the ratio of groove width (L) to pitch (D) exceeds 1.2, the area of ​​the region where the blade surface of the doctor blade contacts or is close to the cylindrical dryer becomes smaller, making it difficult to peel the sheet-like paper from the surface of the cylindrical dryer, which may make it difficult to manufacture crepe paper.

[0092] In the second aspect of the present invention, the ratio of groove width (L) to pitch (D) of the grooves on the blade surface of the doctor blade (L / D) is preferably 0.1 or greater, more preferably 0.3 or greater, and even more preferably 0.5 or greater.

[0093] In the second aspect of the present invention, the groove pitch (D) of the cutting surface of the doctor blade is preferably in the range of 700 μm to 6000 μm, more preferably in the range of 900 μm to 5000 μm, and even more preferably in the range of 1000 μm to 4000 μm.

[0094] The crepe paper 1 manufactured according to the second embodiment of the present invention has numerous wrinkles in the CD direction, which can give the paper bulkiness, softness, water absorption, surface smoothness, and aesthetic appeal (crepe shape).

[0095] The crepe paper 1 manufactured according to the second embodiment of the present invention further has a plurality of ridges in the MD direction, so that the liquid that comes into contact with the crepe paper 1 is guided not only in the CD direction but also in the MD direction along the plurality of ridges extending in the MD direction, and is efficiently absorbed throughout the crepe paper 1. Therefore, the crepe paper 1 can have excellent water absorption or water retention in both the CD direction and the MD direction. [Industrial applicability]

[0096] The crepe paper of the present invention has improved absorbency and can be used as sanitary paper such as paper towels.

[0097] Furthermore, the crepe paper of the present invention can be suitably used for packaging, placing, or preserving food. Because the crepe paper of the present invention has excellent absorbency, it can be used, for example, to absorb drip seeping from meat such as livestock meat. Since the crepe paper of the present invention can efficiently absorb drip, it has high food quality preservation properties, effectively protects food from discoloration, loss of taste, spoilage, etc., and allows food to be preserved for a relatively long period of time.

[0098] The present invention's method for manufacturing crepe paper can produce crepe paper with improved absorbency. [Examples]

[0099] The present invention will be described more specifically below using examples and comparative examples, but the scope of the present invention is not limited to the examples.

[0100] [Example 1] Bleached crepe paper was produced using a cylinder-type Yankee paper machine by adding dry strength agent (Seiko PMC DS4424) and wet strength agent (Seiko PMC WS4030) to a slurry containing wood pulp (Freeness 450cc) mixed with NBKP (softwood bleached kraft pulp) and LBKP (hardwood bleached kraft pulp) in a weight ratio of 40:60, at a concentration of 0.2% by weight relative to the wood pulp.

[0101] Specifically, wet paper was pressed onto the surface of a heated cylindrical Yankee dryer to adhere to it, dried while being transferred, and then a doctor blade was brought into contact with the surface of the Yankee dryer to peel the paper off the surface of the Yankee dryer and produce crepe paper. The basis weight and crepe ratio ((Yankee dryer rotation speed / paper winding speed by reel) × 100) of the bleached crepe paper are shown in Table 1.

[0102] As shown in Figure 4, the blade surface of the doctor blade that contacts the surface of the Yankee dryer had multiple grooves extending in the direction of paper flow (MD direction). Table 1 shows the numerical values ​​of each element that constitutes the surface shape of the doctor blade. K, M, L, and D in Table 1 correspond to K, M, L, and D in Figure 4, respectively.

[0103] [Example 2] Bleached crepe paper was manufactured in the same manner as in Example 1, except that the basis weight of the crepe paper was changed as shown in Table 1. Multiple ridges extending in the MD direction were formed on the bleached crepe paper.

[0104] [Example 3] Bleached crepe paper was manufactured in the same manner as in Example 2, except that the crepe ratio was changed as shown in Table 1. The bleached crepe paper had multiple ridges extending in the MD direction.

[0105] [Example 4] Bleached crepe paper was manufactured in the same manner as in Example 1, except that the surface shape of the doctor blade's blade surface was changed as shown in Table 1. Multiple ridges extending in the MD direction were formed on the bleached crepe paper.

[0106] [Example 5] Bleached crepe paper was manufactured in the same manner as in Example 1, except that the surface shape of the doctor blade's blade surface was changed as shown in Table 1. Multiple ridges extending in the MD direction were formed on the bleached crepe paper.

[0107] [Example 6] Bleached crepe paper was manufactured in the same manner as in Example 1, except that the crepe ratio and the surface shape of the doctor blade were changed as shown in Table 1. Multiple ridges extending in the MD direction were formed on the bleached crepe paper.

[0108] [Comparative Example 1] We attempted to manufacture bleached crepe paper in the same manner as in Example 1, except that the surface shape of the doctor blade was changed as shown in Table 1, but we were unable to manufacture it.

[0109] [Comparative Example 2] We attempted to manufacture bleached crepe paper in the same manner as in Example 1, except that the surface shape of the doctor blade was changed as shown in Table 1, but we were unable to manufacture it.

[0110] [Comparative Example 3] Except for changing the surface shape of the doctor blade as shown in Table 1, we attempted to manufacture bleached crepe paper in the same manner as in Example 6, but we were unable to manufacture it.

[0111] [Table 1]

[0112] In Table 1, the "Result" column indicates whether or not crepe paper was successfully manufactured, with ○ meaning it was successfully manufactured and × meaning it was not.

[0113] [evaluation] The width (W) and spacing (M) of the MD-direction ridges formed on the surface of each bleached crepe paper from Examples 1 to 6 were measured using a Keyence VHX-2000 digital microscope. The results are shown in Table 2.

[0114] The spacing (M) between the peaks of the ridges was the same as the spacing (M) between the grooves on the blade surface of the doctor blade. The morphology of the ridges on the surface of the bleached crepe paper is shown in Table 2. W and M in Table 2 correspond to W and M in Figure 1, respectively.

[0115] [Table 2]

[0116] From Examples 1-6 and Comparative Examples 1-3, it can be seen that in order to manufacture crepe paper having multiple ridges in the MD direction, it is necessary to use a doctor blade equipped with a blade surface having multiple grooves (extending in the MD direction) where the ratio of "groove width L / groove spacing M" is 0.55 or less, and by using such a doctor blade, it is possible to manufacture crepe paper having multiple ridges in the MD direction where the "ridge width W / spacing M" is 0.55 or less. [Explanation of symbols]

[0117] 1: Crepe paper 1': Wet paper 11: Projection 2: Doctor Blade 21: Blade surface 2: Groove 3: Yankee Hair Dryer 4: Press Roll D: Pitch K: Groove depth L: Groove width M: Groove spacing or (ridge) width W: width (of the protrusion)

Claims

1. A crepe paper having multiple ridges extending in the MD direction, The aforementioned protrusions are made of paper, A crepe paper in which the ratio of the width / spacing of the aforementioned protrusions is 0.55 or less.

2. The crepe paper according to claim 1, wherein the width of the ridge is 1800 μm or less.

3. The crepe paper according to claim 1, wherein the spacing between the protrusions is 1500 μm to 7000 μm.

4. Basis weight 20 g / m² ２ ~60g / m ２ The crepe paper according to claim 1.

5. The crepe paper according to claim 1, wherein the crepe content is 5% to 50%.

6. The crepe paper according to claim 1, which is a sanitary paper.

7. The crepe paper according to claim 1, for packaging, placing, or preserving food.

8. A process of drying wet paper on the surface of a rotating cylindrical dryer to form a paper body. The process of peeling the paper body from the surface of the cylindrical dryer using a doctor blade. A method for manufacturing crepe paper comprising: The doctor blade has a blade surface that contacts or is in close proximity to the surface of the cylindrical dryer. The blade surface of the doctor blade has a plurality of grooves extending in the MD direction of the paper body, A method for manufacturing crepe paper, wherein the ratio of groove width to groove spacing of the grooves is 0.55 or less.

9. The manufacturing method according to claim 8, wherein the groove width of the groove is 1800 μm or less.

10. The manufacturing method according to claim 8, wherein the groove spacing of the grooves is 1500 μm to 7000 μm.

11. The manufacturing method according to claim 8, wherein the crepe content is 5% to 50%.

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