Structure and method for improving bulkiness performance and water absorption performance of kitchen paper

Abstract

The invention discloses a structure and method for improving the bulkiness performance and the water absorption performance of kitchen paper, and the structure comprises an embossed surface layer and an embossed bottom layer which are sequentially connected from top to bottom in the vertical direction; a first embossing unit and a second embossing unit are arranged on the lower bottom surface of the embossing surface layer, and a third embossing unit and a fourth embossing unit are arranged on the upper surface of the embossing bottom layer; the first embossing unit comprises a plurality of first protruding parts, and the first protruding parts and the embossing bottom layer form a supporting structure and a water retention unit. The second embossing unit comprises a plurality of second protruding parts, and the second protruding parts and the embossing bottom layer form a supporting structure and a water retention unit. The third embossing unit comprises a plurality of third protruding parts, and the fourth embossing unit comprises a plurality of fourth protruding parts. The first embossing unit and the third embossing unit form a supporting structure, and the second embossing unit and the fourth embossing unit form a water retention unit. The bulk, porosity and water absorption performance of the raw paper for the kitchen paper are improved, and the raw paper has a good supporting structure and water and moisture absorption strength.

Description

Technical Field

[0001] The invention relates to the technical field of kitchen paper, and in particular to a structure and method for improving the bulk and water absorption performance of kitchen paper. Background Art

[0002] Kitchen paper is widely favored by consumers for its convenience, hygiene and other excellent user experience, especially in economically developed areas. Kitchen paper has rapidly grown into one of the most important paper products in the field of household paper. However, traditional kitchen paper has obvious defects such as insufficient water absorption, slow water absorption rate, low wet strength after water absorption and easy to break. It also has disadvantages such as low bulk and poor softness. Traditional kitchen paper is generally made of mixed pulping of coniferous and hardwood, with a beating degree of 30°SR, a single-layer basis weight of about 20g / m2, and double-layer composite embossing. The embossing process is often used to design a variety of different embossing patterns, and the water absorption structure of the embossing points of the paper is changed to improve the water absorption performance of the finished paper. However, the improvement of water absorption performance by changing the embossing pattern alone is very limited, and it is difficult to fundamentally change the water absorption performance of the paper. Summary of the invention

[0003] In view of this, the present invention provides a structure and method for improving the bulk and water absorption performance of kitchen paper.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A structure for improving the bulk and water absorption performance of kitchen paper, comprising two layers of base paper, an embossed surface layer and an embossed bottom layer, wherein the embossed surface layer and the embossed bottom layer are connected in sequence from top to bottom along a vertical direction;

[0006] The lower bottom surface of the embossed surface layer is provided with a first embossing unit and a second embossing unit, and the first embossing unit and the second embossing unit are arranged on the lower bottom surface of the embossed surface layer opposite to the embossed bottom layer; the upper surface of the embossed bottom layer is provided with a third embossing unit and a fourth embossing unit, and the third embossing unit and the fourth embossing unit are arranged on the upper surface of the embossed bottom layer opposite to the embossed surface layer;

[0007] The first embossing unit includes a plurality of first protrusions protruding toward the embossed bottom layer, the first protrusions are in contact with the upper surface of the embossed bottom layer, and form a supporting structure and a water-retaining unit; the second embossing unit includes a plurality of second protrusions protruding toward the embossed bottom layer, the second protrusions are in contact with the upper surface of the embossed bottom layer, and form a supporting structure and a water-retaining unit; the third embossing unit includes a plurality of third protrusions protruding toward the embossed surface layer, the third protrusions are in contact with the lower surface of the embossed surface layer; the fourth embossing unit includes a plurality of fourth protrusions protruding toward the embossed surface layer, the fourth protrusions are in contact with the lower surface of the embossed surface layer; the first embossing unit and the second embossing unit of the embossed surface layer are in contact with the third embossing unit and the fourth embossing unit of the embossed bottom layer respectively, and form a supporting structure and a water-retaining unit with each other.

[0008] Preferably, the first raised portion in the first embossing unit is in contact with the embossed bottom layer, and corresponds to the raised portion in the third embossing unit on the embossed bottom layer; the second raised portion in the second embossing unit is in contact with the embossed bottom layer, and corresponds to the raised portion in the fourth embossing unit on the embossed bottom layer, forming a supporting structure and a cavity area, becoming a water retention unit.

[0009] Preferably, the protrusion heights of the first protrusion and the second protrusion are equal to the protrusion heights of the third protrusion and the fourth protrusion.

[0010] Preferably, the embossed pattern of the embossed surface layer is the same as that of the embossed bottom layer, and the patterns of the embossed surface layer and the embossed bottom layer are arranged corresponding to each other;

[0011] The first protrusion and the third protrusion have the same pattern, both are quadrilateral protrusions, and the second protrusion and the fourth protrusion have the same pattern, both are triangular protrusions.

[0012] Preferably, the embossed units of the embossed surface layer and the embossed bottom layer are evenly distributed.

[0013] Preferably, the protrusion height of the first protrusion is 0.3-0.8 mm, the protrusion height of the second protrusion is 0.3-0.8 mm, the protrusion height of the third protrusion is 0.3-0.8 mm, and the protrusion height of the fourth protrusion is 0.3-0.8 mm.

[0014] Preferably, the side length of the protrusion units of the first protrusion and the third protrusion is 2.0-7.0 mm, the width is 2.0-7.0 mm, and the height is 0.3-0.8 mm; the side length of the protrusion units of the second protrusion and the fourth protrusion is 2.0-5.0 mm, and the height is 0.3-0.8 mm.

[0015] Preferably, the first embossing unit, the second embossing unit, the third embossing unit and the fourth embossing unit all perform lamination embossing at a pressure of 0.15 to 0.65 MPa.

[0016] A method for improving the bulk and water absorption properties of kitchen paper, comprising the following steps:

[0017] Step 1: Mix and beat the softwood pulp board and the high-yield pulp board;

[0018] Step 2: using a laboratory sheet making machine to make the kitchen paper base paper in a wet state;

[0019] Step 3: Drying with a vacuum dryer to obtain the kitchen paper base paper in a dry state.

[0020] Preferably, in the step 1, the high-yield pulp accounts for 5% to 35%, the coniferous wood pulp accounts for 65% to 95%, the beating degree is 25 to 30° SR, and the beating concentration is 0.3% to 0.5%; in the step 2, part of the high-yield pulp is added to replace part of the coniferous wood pulp for papermaking.

[0021] Compared with the prior art, the present invention has achieved the following technical effects:

[0022] (1) The present invention uses high-yield pulp to replace part of the softwood pulp, and utilizes the characteristics of high-yield pulp fibers being stiff, so that the obtained kitchen paper base paper has significantly improved bulk, water absorption performance and porosity compared with the traditional kitchen paper base paper;

[0023] (2) The kitchen paper obtained by the present invention has a convex portion of the first convex part of the first embossing unit forming a cavity area, and the convex portion of the first convex part is in contact with the upper surface of the embossed bottom layer; the convex portion of the second convex part of the second embossing unit forms a cavity area, and the convex portion of the second convex part is in contact with the lower bottom surface of the embossed surface layer; the first convex part and the second convex part are in contact with each other to form a supporting structure, and the unembossed portion adjacent to the first convex part and the unembossed portion adjacent to the second convex part form a cavity area and a water-retaining unit, and these water-retaining units will gradually absorb water and lock the absorbed water; the addition of high-yield pulp and the embossing process make the kitchen paper have good bulk and water absorption performance, as well as good support structure and water absorption wet strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A diagram showing the embossed surface structure of a structure and method for improving the bulk and water absorption performance of kitchen paper according to the present invention;

[0025] Figure 2 A diagram showing the structure of an embossed bottom layer of a structure and method for improving the bulk and water absorption performance of kitchen paper according to the present invention;

[0026] Figure 3 The kitchen paper structure diagram of the present invention is a structure and method for improving the bulk and water absorption performance of kitchen paper.

[0027] Among them, 1. embossed surface layer; 2. embossed bottom layer; 10. first embossed unit; 20. second embossed unit; 30. third embossed unit; 40. fourth embossed unit; 11. first raised portion; 21. second raised portion; 31. third raised portion; 41. fourth raised portion; 100. water flow channel; 200. water storage area. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] The present invention discloses a structure for improving the bulk and water absorption performance of kitchen paper, comprising two layers of base paper, an embossed surface layer 1 and an embossed bottom layer 2, wherein the embossed surface layer 1 and the embossed bottom layer 2 are connected in sequence from top to bottom along a vertical direction;

[0030] The lower bottom surface of the embossed surface layer 1 is provided with a first embossing unit 10 and a second embossing unit 20, and the first embossing unit 10 and the second embossing unit 20 are arranged on the lower bottom surface of the embossed surface layer 1 opposite to the embossed bottom layer 2; the upper surface of the embossed bottom layer 2 is provided with a third embossing unit 30 and a fourth embossing unit 40, and the third embossing unit 30 and the fourth embossing unit 40 are arranged on the upper surface of the embossed bottom layer 2 opposite to the embossed surface layer 1;

[0031] The first embossing unit 10 includes a plurality of first protrusions 11 protruding toward the embossed bottom layer 2, and the first protrusions 11 are in contact with the upper surface of the embossed bottom layer 2 to form a support structure and a water-retaining unit; the second embossing unit 20 includes a plurality of second protrusions 21 protruding toward the embossed bottom layer 2, and the second protrusions 21 are in contact with the upper surface of the embossed bottom layer 2 to form a support structure and a water-retaining unit; the third embossing unit 30 includes a plurality of third protrusions 31 protruding toward the embossed surface layer 1, and the third protrusions 31 are in contact with the lower surface of the embossed surface layer 1; the fourth embossing unit 40 includes a plurality of fourth protrusions 41 protruding toward the embossed surface layer 1, and the fourth protrusions 41 are in contact with the lower surface of the embossed surface layer 1; the first embossing unit 10 and the second embossing unit 20 of the embossed surface layer 1 are in contact with the third embossing unit 30 and the fourth embossing unit 40 of the embossed bottom layer 2 respectively, and form a support structure and a water-retaining unit with each other.

[0032] The first raised portion 11 in the first embossing unit 10 contacts the embossed bottom layer 2 and corresponds to the raised portion in the third embossing unit 30 on the embossed bottom layer 2; the second raised portion 21 in the second embossing unit 20 contacts the embossed bottom layer 2 and corresponds to the raised portion in the fourth embossing unit 40 on the embossed bottom layer 2, forming a supporting structure and a cavity area, becoming a water-retaining unit.

[0033] The protrusion heights of the first protrusion 11 and the second protrusion 21 are equal to the protrusion heights of the third protrusion 31 and the fourth protrusion 41 .

[0034] The embossed pattern of the embossed surface layer 1 is the same as that of the embossed bottom layer 2, and the patterns of the embossed surface layer 1 and the embossed bottom layer 2 are arranged corresponding to each other;

[0035] The first protrusion 11 and the third protrusion 31 have the same pattern, both are quadrilateral protrusions, and the second protrusion 21 and the fourth protrusion 41 have the same pattern, both are triangular protrusions.

[0036] The embossed units of the embossed surface layer 1 and the embossed bottom layer 2 are evenly distributed.

[0037] The protrusion height of the first protrusion 11 is 0.3-0.8 mm, the protrusion height of the second protrusion 21 is 0.3-0.8 mm, the protrusion height of the third protrusion 31 is 0.3-0.8 mm, and the protrusion height of the fourth protrusion 41 is 0.3-0.8 mm.

[0038] The side length of the protrusion unit of the first protrusion 11 and the third protrusion 31 is 2.0-7.0 mm, the width is 2.0-7.0 mm, and the height is 0.3-0.8 mm; the side length of the protrusion unit of the second protrusion 21 and the fourth protrusion 41 is 2.0-5.0 mm, and the height is 0.3-0.8 mm.

[0039] The first embossing unit 10 , the second embossing unit 20 , the third embossing unit 30 and the fourth embossing unit 40 all perform lamination embossing at a pressure of 0.15 to 0.65 MPa.

[0040] A method for improving the bulk and water absorption properties of kitchen paper, comprising the following steps:

[0041] Step 1: Mix and beat the softwood pulp board accounting for 65% to 95% and the high-yield pulp board accounting for 5% to 35%, with a beating degree of 25 to 30° SR and a beating concentration of 0.3% to 0.5%;

[0042] Step 2: using a laboratory sheeting machine to make the kitchen paper base paper in a wet state, adding part of the high-yield pulp to replace part of the softwood pulp to make the paper;

[0043] Step 3: Drying with a vacuum dryer to obtain the kitchen paper base paper in a dry state.

[0044] The embossed surface layer 1 comprises an embossed surface layer body 1, a first protrusion unit 10 and a second protrusion unit 20, a plurality of first protrusions 11 and a second protrusion 21, wherein the first protrusion 11 is a rectangular parallelepiped protrusion, and the second protrusion is a triangular prism protrusion;

[0045] The embossed bottom layer 2 includes an embossed bottom layer body 2, a third protrusion unit 30 and a fourth protrusion unit 40, a plurality of third protrusion portions 31 and a fourth protrusion portion 41, the third protrusion portion 31 and the first protrusion portion 11 are symmetrically arranged up and down, both are rectangular protrusions, and the fourth protrusion portion 41 and the second protrusion portion 21 are symmetrically arranged up and down, both are triangular prism-shaped protrusions.

[0046] A water storage area 200 is formed between the two side surfaces of two adjacent first protrusions 11 and the embossed surface layer 1, and between the two adjacent side surfaces of the corresponding third protrusion 31 and the embossed bottom layer 2. A water flow channel 100 is formed between the two side surfaces of two adjacent second protrusions 21 and the embossed surface layer 1, and between the two adjacent side surfaces of the corresponding fourth protrusion 41 and the embossed bottom layer 2. The second embossing unit 20 and the fourth embossing unit 40 have two rows of protrusions near the edge of the paper web and near the inside of the paper web, respectively. Therefore, the cross-section of the formed water flow channel 100 presents a "Y" shape. Therefore, after the paper web meets water, the water flow will be diverted to the left and right along the water flow channel 100 and enter the water storage area 200, forming a water locking effect.

[0047] Embodiment 1:

[0048] A kitchen paper with high bulk and high water absorption performance is provided, wherein an embossed surface layer 1 and an embossed bottom layer 2 are provided, and the base paper is made by mixing coniferous wood pulp and high-yield pulp, wherein the coniferous wood pulp:high-yield pulp is 80:20.

[0049] Comparative Example 1 reduces the spacing between the embossed units of the embossed surface layer 1 and the embossed bottom layer 2, and the spacing between the embossed units is reduced by 30% compared with Example 1, that is, the size of the water storage area 200 and the water flow channel 100 is reduced. The remaining experimental conditions of Comparative Example 1 are the same as those of Example 1.

[0050] Comparative Example 2 increases the spacing between the embossed units of the embossed surface layer 1 and the embossed bottom layer 2, and the spacing between the embossed units increases by 30% compared with Example 1, that is, the size of the water storage area 200 and the water flow channel 100 is increased. The remaining experimental conditions of Comparative Example 2 are the same as those of Example 1.

[0051] The relevant detection of the present invention is shown in Table 1:

[0052] Table 1:

[0053]

[0054] As can be seen from Table 1, Example 1 is higher than Comparative Examples 1, 2 and the commercial product in terms of both water absorption and water absorption rate. Compared with Comparative Examples 1 and 2, Example 1 has an increase of 1.9% and 7.25% in water absorption, 2.7% and 9.18% in water absorption rate, and no significant difference in bulk. The water absorption and water absorption rate of Example 1 are much higher than the commercial product, with an increase of 26.9% and 16.5% respectively, and the bulk is increased by 8.2%. It can be seen that the performance of the kitchen paper obtained in Example 1 of the present invention is better than that of Comparative Examples 1, 2 and the commercial product.

[0055] Embodiment 2:

[0056] A kitchen paper with high bulk and high water absorption performance is provided, wherein an embossed surface layer 1 and an embossed bottom layer 2 are provided, and the base paper is made by mixing coniferous wood pulp and high-yield pulp, wherein the coniferous wood pulp:high-yield pulp is 80:20.

[0057] In Comparative Example 3, the addition ratio of high-yield pulp is increased, and the ratio of softwood pulp to high-yield pulp is 70:30. The remaining experimental conditions of Comparative Example 3 are the same as those of Example 2.

[0058] In Comparative Example 4, the addition ratio of high-yield pulp is reduced, and the ratio of coniferous wood pulp to high-yield pulp is 90:10. The remaining experimental conditions of Comparative Example 4 are the same as those of Example 2.

[0059] The relevant detection of the present invention is shown in Table 2:

[0060] Table 2:

[0061] Paper related properties Example 2 Comparative Example 3 Comparative Example 4 Weight before water absorption (g) 0.610 0.606 0.608 Weight after water absorption (g) 3.23 2.59 3.03 Water absorption (g / g) 4.29 3.27 3.98 Water absorption rate (mm / 100s) 43.31 36.84 41.58 Bulk thickness (cm3 / g) 2.75 2.79 2.63

[0062] As can be seen from the above table, both the water absorption and water absorption rate of Example 2 are much higher than those of Comparative Examples 3 and 4. The quality of the examples after water absorption is higher than that of Comparative Examples 3 and 4, and the water absorption is increased by 7.78% and 31.19%; in terms of water absorption rate, Example 2 is also higher than Comparative Examples 3 and 4, with increases of 4.16% and 17.56%, respectively. The bulk of Example 2 is 4.5% higher than that of Comparative Example 4, and the bulk of Comparative Example 3 is higher than that of Example 2, but the water absorption and water absorption rate are not significantly improved, indicating that when the proportion of high-yield pulp reaches more than 20%, the improvement of water absorption performance is limited. It can be seen that the performance of the kitchen paper obtained in Example 2 of the present invention is better than that of Comparative Examples 3 and 4.

[0063] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A structure for improving the bulk and water absorption performance of kitchen paper, characterized in that: It comprises two layers of base paper, an embossed surface layer (1) and an embossed bottom layer (2), wherein the embossed surface layer (1) and the embossed bottom layer (2) are connected in sequence from top to bottom along the vertical direction; The lower bottom surface of the embossed surface layer (1) is provided with a first embossing unit (10) and a second embossing unit (20), and the first embossing unit (10) and the second embossing unit (20) are arranged on the lower bottom surface of the embossed surface layer (1) opposite to the embossed bottom layer (2); the upper surface of the embossed bottom layer (2) is provided with a third embossing unit (30) and a fourth embossing unit (40), and the third embossing unit (30) and the fourth embossing unit (40) are arranged on the upper surface of the embossed bottom layer (2) opposite to the embossed surface layer (1); The first embossing unit (10) comprises a plurality of first protrusions (11) protruding toward the embossed bottom layer (2), the first protrusions (11) being in contact with the upper surface of the embossed bottom layer (2) to form a support structure and a water-retaining unit; the second embossing unit (20) comprises a plurality of second protrusions (21) protruding toward the embossed bottom layer (2), the second protrusions (21) being in contact with the upper surface of the embossed bottom layer (2) to form a support structure and a water-retaining unit; the third embossing unit (30) comprises a plurality of third protrusions (31) protruding toward the embossed surface layer (1), the third protrusions (31) being in contact with the lower surface of the embossed surface layer (1); The fourth embossing unit (40) comprises a plurality of fourth protrusions (41) protruding toward the embossed surface layer (1), and the fourth protrusions (41) are in contact with the lower surface of the embossed surface layer (1); the first embossing unit (10) and the second embossing unit (20) of the embossed surface layer (1) are in contact with the third embossing unit (30) and the fourth embossing unit (40) of the embossed bottom layer (2) respectively, forming a supporting structure and a water-retaining unit with each other.

2. A structure for improving the bulk and water absorption performance of kitchen paper according to claim 1, characterized in that: The first raised portion (11) in the first embossing unit (10) is in contact with the embossed bottom layer (2) and corresponds to the raised portion in the third embossing unit (30) on the embossed bottom layer (2); the second raised portion (21) in the second embossing unit (20) is in contact with the embossed bottom layer (2) and corresponds to the raised portion in the fourth embossing unit (40) on the embossed bottom layer (2), thereby forming a supporting structure and a cavity area, becoming a water-retaining unit.

3. A structure for improving the bulk and water absorption performance of kitchen paper according to claim 1, characterized in that: The protrusion heights of the first protrusion (11) and the second protrusion (21) are equal to the protrusion heights of the third protrusion (31) and the fourth protrusion (41).

4. A structure for improving the bulk and water absorption performance of kitchen paper according to claim 1, characterized in that: The embossed pattern of the embossed surface layer (1) is the same as that of the embossed bottom layer (2), and the patterns of the embossed surface layer (1) and the embossed bottom layer (2) are arranged corresponding to each other; The first protrusion (11) and the third protrusion (31) have the same pattern, both are quadrilateral protrusions, and the second protrusion (21) and the fourth protrusion (41) have the same pattern, both are triangular protrusions.

5. A structure for improving the bulk and water absorption performance of kitchen paper according to claim 1, characterized in that: The embossed units of the embossed surface layer (1) and the embossed bottom layer (2) are evenly distributed.

6. A structure for improving the bulk and water absorption performance of kitchen paper according to claim 1, characterized in that: The protrusion height of the first protrusion (11) is 0.3-0.8 mm, the protrusion height of the second protrusion (21) is 0.3-0.8 mm, the protrusion height of the third protrusion (31) is 0.3-0.8 mm, and the protrusion height of the fourth protrusion (41) is 0.3-0.8 mm.

7. A structure for improving the bulk and water absorption performance of kitchen paper according to claim 1, characterized in that: The side length of the protrusion units of the first protrusion (11) and the third protrusion (31) is 2.0 to 7.0 mm, the width is 2.0 to 7.0 mm, and the height is 0.3 to 0.8 mm; the side length of the protrusion units of the second protrusion (21) and the fourth protrusion (41) is 2.0 to 5.0 mm, and the height is 0.3 to 0.8 mm.

8. A structure for improving the bulk and water absorption performance of kitchen paper according to claim 1, characterized in that: The first embossing unit (10), the second embossing unit (20), the third embossing unit (30) and the fourth embossing unit (40) all perform lamination embossing at a pressure of 0.15 to 0.65 MPa.

9. A method for improving the bulk and water absorption properties of kitchen paper, characterized in that: The steps include: Step 1: Mix and beat the softwood pulp board and the high-yield pulp board; Step 2: using a laboratory sheet making machine to make the kitchen paper base paper in a wet state; Step 3: Drying with a vacuum dryer to obtain the kitchen paper base paper in a dry state.

10. A method for improving the bulk and water absorption properties of kitchen paper according to claim 9, characterized in that: In the step 1, the high-yield pulp accounts for 5% to 35%, the coniferous wood pulp accounts for 65% to 95%, the beating degree is 25 to 30° SR, and the beating concentration is 0.3% to 0.5%; in the step 2, part of the high-yield pulp is added to replace part of the coniferous wood pulp.

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