WO2008069085A1

WO2008069085A1 - Tissue paper product and method of embossing tissue paper

Info

Publication number: WO2008069085A1
Application number: PCT/JP2007/073015
Authority: WO
Inventors: Makoto Nakamura; Yoshiki Endo
Original assignee: Daio Paper Corporation
Priority date: 2006-11-29
Filing date: 2007-11-29
Publication date: 2008-06-12

Abstract

[PROBLEMS] To provide a tissue paper product that is bulky and soft, excelling in sensuousness. [MEANS FOR SOLVING PROBLEMS] The tissue paper product is one comprising a laminate of embossed tissue papers, wherein each of the tissue papers has a first embossment and a second embossment of depth less than that of the first embossment, and wherein the depth ratio of first embossment to second embossment (first embossment : second embossment) is in the range of 2:1 to 7:6, and wherein tissue papers adjacent to each other at top areas, or top area and bottom area of the first embossment are bonded to each other by means of an adhesive, and wherein in the second embossment no bonding is made between tissue papers adjacent to each other.

Description

Specification

Thin paper product and embossing method of thin paper

Technical field

[0001] The present invention relates to a thin paper product such as toilet paper, tissue paper, towel paper, kitchen paper, and decorative paper, and a method for embossing the thin paper used therein.

Background art

[0002] This type of thin paper product is made by laminating a plurality of thin papers, and has the purpose of improving bulkiness, improving absorbency, improving wiping properties, improving touch feeling, and improving appearance. Giving a boss is a general-purpose technology. Usually, force or embossing is applied by passing thin paper between metal rolls with irregularities corresponding to male and female on the surface, or between metal rolls and elastic rolls made of rubber. To do.

Many proposals have been made for embossing forms of thin paper products. Typically, a “Tip to Tip” form (for example, see Patent Document 1) and a “nested” form (for example, see Patent Document 2). Well known.

Also, embosses with different depths are provided on each facing thin paper, and the tops of the deep embossed ones or the thin papers facing each other at the top and bottom are bonded to each other. Embossing forms that do not adhere to the facing thin paper have also become widespread. (For example, Patent Document 3).

Patent Document 1: JP 2003-288596

Patent Document 2: JP-A-11-009766

Patent Document 3: JP 2003-116741

Disclosure of the invention

Problems to be solved by the invention

[0003] However, with current technology, when embossing with different depths is applied to a single thin paper, embossing with a shallow depth cannot be clearly and clearly applied. The product has a low degree of freedom of pattern due to the embossed pattern. The shallow embossed part, which has a large difference in appearance between the deep embossed pattern and the shallow embossed pattern, may become blurred, which may deteriorate the aesthetics of the entire embossed pattern. The problem of not being able to give clear, clear embossing force and shallow embossing is common in sanitary thin paper, but such problems are particularly high due to low basis weight, thin paper thickness, etc. It is extremely low as Og / m ^2, and its thickness is also 80 ~; 160〃 m, it is extremely thin, and it is considered to be a big problem! ! /

Accordingly, a main object of the present invention is to provide a thin paper product to which embossing is clearly and clearly applied, and a method for embossing the thin paper used therefor.

Means for solving the problem

[0004] The present invention that has solved the above problems and the effects thereof are as follows.

A thin paper product in which embossed thin paper is laminated,

Each thin paper has a first emboss and a second emboss having a shallower emboss depth than the first emboss, and the ratio of the depth of the first emboss to the second emboss (the depth of the first emboss: 2) The depth of the boss is 2 ;;! ~ 7: 6, and

Adjacent thin paper is bonded to the top of the first embossing or the top and bottom, and the second emboss is not bonded to the adjacent thin paper.

[0005] <Invention of Claim 2>

2. The tissue paper product according to claim 1, wherein the depth of the first emboss is 1 · 0 to 2 · Omm, and the depth of the second emboss is 0.8 to 1.3 mm.

[0006] <Invention of Claim 3>

The thin paper product according to claim 1 or 2, wherein a difference in depth between the first emboss and the second emboss is 0.2 mm or more and 0.7 mm or less.

[0007] <Invention of Claim 4>

The thin paper product according to any one of claims 1 to 3, wherein the bottom shapes of the first and second embosses are substantially the same, and the intervals between adjacent embosses are equal.

<0008> <Invention of claim 5>

The thin leaf according to claim 4, wherein a separation distance between adjacent embosses is 1.7 to 3.3 mm; Paper products.

[0009] <Invention of Claim 6>

The thin paper product according to any one of claims 1 to 5, wherein the area ratio of the adhesive-applied portion in plan view is 3 to 15%.

[0010] <Invention of Claim 7>

An embossing method for embossing a thin paper through a thin paper between a pair of embossing rolls,

At least one of the embossing rolls,

A first embossing convex portion and a second embossing convex portion having a lower height than the first embossing convex portion, and the ratio of the heights of the embossing convex portions (the first embossing convex portion). Embossing method for thin paper, characterized in that a convex embossing roll having a height of the part: the height of the second embossing convex part) is 2:;! ~ 7: 6.

[0011] <Invention of Claim 8>

8. The embossing method for thin paper according to claim 7, wherein the height of the first embossing convex portion is 1.0 to 2. Omm, and the height of the second embossing convex portion is 0.8 to 1.3 mm.

The method of embossing thin paper according to claim 7 or 8, wherein the height difference S between the first embossing convex portion and the second embossing convex portion is 0.2 mm or more and 0.7 mm or less.

The top surface shape of the first and second embossing projections is substantially the same, and the interval between adjacent embossing projections is an equal interval. Embossing method of thin paper.

The embossing method of thin paper according to any one of claims 7 to 10, wherein the separation distance force between adjacent embossing convex portions is 1.7 to 3.3 mm.

The embossing method for thin paper according to any one of claims 7 to 11, wherein the area ratio of the adhesive application portion in plan view is 3 to 15%. <Invention of Claim 13>

13. The embossing method for thin paper according to claim 7, wherein the embossing pressure is 5 to 30 kgf / cm.

The invention's effect

[0017] As described above, according to the present invention, a thin paper product to which embossing is imparted clearly and clearly is obtained.

BEST MODE FOR CARRYING OUT THE INVENTION

Next, an example of the present embodiment will be described in detail below with reference to the drawings. 1 and 2 are enlarged partial sectional views of the thin paper product XI of this embodiment, FIG. 3 is a schematic view of the embossing roll, and FIGS. 4 and 5 are rolls having embossing convex portions. FIG.

[0019] <Thin paper products>

The thin paper products XI of this embodiment are formed by stacking embossed thin papers 1, 1 as is clear from the examples of FIGS. 1 and 2, and each thin paper 1, 1 has a first emboss el, el… The second embossing e2, Θ2 ··· are shallower than the first embossing el, el….

[0020] Further, the thin paper product XI of this embodiment is composed of the tops tl, tl ... of the first embossed el, el ... of the adjacent thin papers 1, 1, and the tops t2 of the second embossed e2, Θ2 ... , T2 'are in the so-called “Tip to Tip” form. Furthermore, the tops of the two thin paper sheets 1, 1 force S, the first emboss el, el… are bonded together, and the second emboss e2, Θ2 ··· take a form that is not adhered to the adjacent thin paper. The present invention is not limited to this. Adjacent thin papers may be bonded to each other at the top and bottom of the first emboss, and the second emboss may be in a “nested” form not bonded to the adjacent thin paper. . Here, in this specification, the top is the top surface of the convex portion protruding so as to approach as viewed from the facing thin paper, and the bottom portion is the bottom surface of the concave portion recessed so as to be separated from the facing thin paper.

[0021] The first emboss el, el ... and the second emboss e2, Θ2... Each have a substantially flat top tl..., 12. Both have a square shape in plan view. The shape of the top is not only square, but also, for example, rhombus, circle, ellipse, polygon, etc. There may be. What is necessary is just to design the magnitude | size of one emboss and the arrangement | sequence of each emboss suitably. For example, in this embodiment, although not shown in the figure, the embossed array is such that the square tops of each emboss are regularly and alternately arranged in parallel with each side being parallel.

[0022] Further, in the thin paper product XI, the shape of the concave portion between the adjacent top portions is a shape in which the cross section does not have a curved portion, and as a whole is a so-called trapezoidal emboss. The cross-sectional shape of the boss is not limited to a trapezoidal shape, but can be an appropriate shape. The effect of the present invention (giving a clear and clear embossing) can be exhibited by the trapezoidal shape. The trapezoidal shape is also preferable in terms of appearance.

On the other hand, the thin paper product XI of this embodiment has a depth ratio of the first emboss el, second emboss and e2 (first emboss depth D1: second emboss depth D2) to 2 :;! ~ 7: 6. Because of the ratio of force, force, and depth, the second embossment has almost no difference in appearance from the first emboss.

[0024] Further, the depth D1 of the first embossed el is 1 · 0 to 2 · Omm, and the depth D2 of the second embossed e2 is 0.8 to 0.8; The difference between the depth D1 and the depth D2 of the second embossed e2 D3 is 0.2 mm or more and 0.7 mm or less, and the separation distance L1 between adjacent embossments is 1.7 mm to d. Dmm.

[0025] By adopting the above embodiment, only the top of the first embossed el is adhered, and the second embossed e2 is adhered to the adjacent thin paper sheet, so that it has a lamellar shape. In addition, the shallow second embossing e2 disposed between the adjacent first embossing el and el prevents the non-adhered portion from being crushed and has a bulky feeling.

[0026] And, particularly in the specific numerical range shown above, the first embossed el, el ... and the second embossed e2, _Θ2 , ... are very clear and clear, and the second embossed e2, Θ2 ··· is the first embossed el, el… and there is no difference in appearance and it is extremely excellent in aesthetics. The effect is particularly remarkable in the case of the basis weight and thickness of thin paper used as toilet paper.

[0027] Here, as is apparent from the figure and the above description, in the example shown in FIG. 1, the top shape of the second emboss and the first emboss is the same, and the second emboss is given twice the number of the first emboss. This is an example. The example shown in FIG. 2 is an example in which the top shapes of the first emboss and the second emboss are the same, and the number of them is also the same. Thus, the example shown in Figure 1 and Figure 2 The example shown is a force in which the number of arrangements of the first emboss and the second emboss is different. Since there is no difference in the arrangement of the emboss shape and the separation distance, etc. With the effect that there is almost no difference in appearance, it can be visually recognized as an embossed pattern that is almost the same in plan view. Note that the specific number of the first emboss and the second emboss and the ratio thereof are not limited to the illustrated example, and can be determined as appropriate by considering the emboss pattern and the emboss arrangement.

[0028] <Manufacturing method of tissue paper product>

When manufacturing the above-mentioned thin paper product XI, first, a thin paper 1 'is obtained from the raw material by making a raw paper pulp, etc., and then the thin paper 1' is embossed and further laminated appropriately. Can be manufactured.

[0029] The raw material of the thin paper is not particularly limited, and an appropriate material can be used according to the use such as kitchen paper, toilet paper, tissue paper and the like. When pulp fiber is used as the raw material, the pulp fiber (raw pulp) is, for example, wood pulp, non-wood pulp, synthetic pulp, waste paper pulp, etc., more specifically, groundwood pulp. (GP), Stone Grand Pulp (SGP), Refiner Grand Pulp (RGP), Pressurized Ground Pulp (PGW), Thermomechanical Pulp (TMP), Chemi Thermomeca Ninore Pulp (CTMP), Bleach Chemi Thermomechanical Pulp (BCTMP), etc. Craft pulp (KP), soda pulp (MPK), chemical mechanical pulp (CGP), semi-chemical pulp (SCP), hardwood bleached kraft pulp (LBKP), softwood bleached kraft pulp (NBKP), etc. The raw material is chemical pulp (CP) such as AP), sulfite pulp (SP), dissolved pulp (DP), nylon, rayon, polyester, polybulal alcohol (PVA), etc. Used pulp, deinked pulp (DIP), waste paper pulp such as waist pulp (WP), ground pulp (TP), cotton, flax, hemp, jute, manila hemp, ramie, etc. One or several kinds of auxiliary pulps such as balm pulp, bagasse pulp, bamboo pulp, kenaf pulp, and other stalk pulp, and bast pulp can be appropriately selected and used. However, the thin paper is preferably made of one or more raw materials selected from the group of pulp fiber, recycled fiber and rayon. When these are used as raw materials, the effect of the present invention of giving embossing clearly and clearly is effectively exhibited. [0030] The raw material such as pulp fiber is made into a thin paper through, for example, a known papermaking process, specifically, a wire part, a press part, a dryer part, a size press, a calendar part, and the like. When making this paper, for example, pH adjusting agents such as dispersants, caustic soda and aqueous ammonia, antifoaming agents, preservatives, fluorescent dyes, mold release agents, water resistance agents, flow modifiers, yield improvers, etc. Chemicals can be added.

[0031] Regarding the basis weight and paper thickness of the thin paper 1, the paper making conditions and the weighting conditions may be appropriately adjusted according to the desired thin paper product type. In other words, the paper is adjusted to an appropriate basis weight and paper thickness suitable for toilet paper, tissue paper, and kitchen paper. For toilet paper, it should be ίί, weighing capacity 12.0-21. Og / m ² , thickness 80 ~;

[0032] As shown in Fig. 3, the thin paper obtained by processing the raw material into paper is passed through a pair of embossed rolls 10 and 20 to give embossed el and e2. A pair of embossing rolls 10, 20ί, both of which can be used as metal rolls It is preferable that one is an elastic roll made of rubber or the like and the other is a metal roll having an embossing projection. The combination of the elastic roll and the metal roll is preferable because there is no problem of adjustment of the clearance of the roll or problems such as paper dust clogging the roll.

[0033] Here, at least one of the embossing rolls 10 is the first as shown in FIG. 4 or FIG.

1 embossing convex part E1 and the second embossing convex part Ε2, which is lower than the first embossing convex part E1, and the ratio of the heights of the embossing convex part El and Ε2 ( The height of the first embossing convex part HI: The height of the second embossing convex part H2) is 2:;! ~ 7: 6. In this embodiment, the metal roll 10 has this configuration as a preferred embodiment.

[0034] By using the embossing roll 10 having the embossing projections Ε1 ···, Ε2 ··· of this configuration, the first embossing el 1, el ... Embossed e2, Θ2, and so on are formed. When embossing is applied at this ratio, the difference in appearance between the first embossed el, el… and the shallower second embossed e2, Θ2 ··· is almost unnoticeable, and the shallow second embossed e2 , Θ2 ··· does not blur.

[0035] In the prior art, when embossing with different depths is applied, the depth is too shallow! /, The embossing is unclear. 'It becomes unclear and the appearance difference with the deep embossing is also a factor of aesthetic deterioration. However, if this roll 10 is used, the second emboss e2, Θ2 ... The embossed el, el… and the contrast are comparable, the el, e2 look difference between the two embosses is extremely small, improving aesthetics and increasing the freedom of the embossed pattern

Yes

[0036] Here, in the present embodiment, where it is desired that the first embossing convex portion E1 and the second embossing convex portion E2 are both substantially flat top surfaces, the top surfaces are both not shown. In a plan view, 0.5 ~; 1. It has a square shape of 5mm square (in Fig. 4 and 5, the length of one side of the top surface is indicated by L2). The shape of the top surface T is other, for example, a rhombus. It can be a circle, an ellipse, a polygon, etc. In addition, the shape of the concave portion between the top surfaces Τ, Τ,... Of the embossing convex is a shape in which the cut surface does not have a curved portion, and is a so-called trapezoidal convex portion as a whole.

[0037] On the other hand, the specific heights HI and H2 of the embossing projections El and E2 are appropriately adjusted according to the product type, the pattern formed by the embossing, the paper quality of the thin paper, and the fiber length of the raw material. 1S Generally, the height HI of the first embossed convex part E1 is in the range of 1.0 to 2. Omm, and the height H2 of the second embossed convex part E2 is 0.8 to 0.8 mm. It should be a range. Force due to roll pressure Within this range, it is possible to give a clear and clear emboss to a thin paper. In particular, this condition is extremely effective for thin paper for toilet paper or tissue paper having a low basis weight and thin paper thickness among thin papers.

[0038] On the other hand, the difference H3 between the height HI of the first embossing projection E1 and the height H2 of the second embossing projection E2 is the same as the heights HI and H2 of the embossing projections El and E2. Depending on the product type, pattern formed by embossing, paper quality of thin paper, and fiber length of the raw material, it is adjusted as appropriate, but the height of the first embossing convex part E1 and the second embossing convex part E2 is generally high. The height difference H3 shall be 0.2 mm or more and 0.7 mm or less. If it is less than 0.2 mm, the difference in depth between the first emboss el and the second emboss e2 becomes small, and it becomes difficult to apply adhesive only to the top tl of the first emboss el. In addition, if the thickness exceeds 0.7 mm, the risk of the thin paper 1 breaking is significantly increased. This condition is also very effective for thin paper for toilet paper or tissue paper with low basis weight and thin paper thickness.

[0039] On the other hand, the separation distance L3 between the adjacent embossing projections is 1.7 mm or more regardless of whether the heights of the adjacent embossing projections are different but the same. It is good to make it. 1. If it is less than 7 mm, embossing may not be clear. This condition is also very effective for thin papers, such as toilet paper with a low basis weight and thin paper thickness, or tissue paper for tissue paper. In addition, even if it is 1.7 mm or more, 3.3 mm or less is acceptable. If it exceeds 3.3 mm, the space formed between the embosses cannot be maintained, and the space is easily crushed and not easily bulky.

[0040] On the other hand, the emboss pattern formed by a large number of first and second embossing projections Ε1 ···, Ε2 ··· is an appropriate design matter. If the top surface shape of the second embossing projections El and E2 is made substantially the same, and the spacing L2 between the adjacent embossing projections is an equi-embossed pattern, the force that has not been obtained so far, Despite the presence of embossments with different depths, a thin paper is obtained having embossments that do not appear to differ.

[0041] The embossing is performed such that the embossing pressure between the pair of embossing rolls 10 and 20 is 5 to 30 kgf / cm, preferably 10 to 25 kgf / cm, more preferably 15 to 20 kgf / cm. If the embossing pressure is too low, the effect of clearing the embossing S may be insufficient. On the other hand, if the embossing pressure is too high, the processed paper may be torn.

[0042] When the pair of embossing rolls is a combination of an elastic roll and a metal roll, the elastic roll preferably has a Shore hardness force of 40 to 70 on its surface. If the Shore hardness is too low, that is, if the elastic roll surface is too soft, the thin paper may break. On the other hand, if the Shore hardness is too high, that is, if the surface of the elastic roll is too hard, embossing may not occur.

[0043] The thin paper to which embossing Θ1 ···, Θ2 ··· is applied as described above is laminated according to a known method, wound up and cut appropriately, for example, kitchen paper and toilet paper. , Tissue paper and other thin paper products XI.

[0044] Adhesion between the thin papers 1 and 1 is performed by applying an adhesive to the top tl of the first embossed el of all or part of one or both thin papers 1 and then the adhesive application surfaces are paired. Laminate to face thin paper and bond. Lamination and application of adhesives can be done with force S using known techniques. [0045] Here, the preferred area of the adhesive application part, that is, the total area of the top part to which the adhesive is applied in the present embodiment is in the range of 3 to 15% of the sheet area (one side). Good. Within this range, the effect of hardening by the adhesive is small, and the softness by embossing can be secured sufficiently.

[0046] The thin paper product XI produced by force is bonded to only the top tl of the first embossed el, and the second embossed e2 is not bonded to the adjacent thin paper. Furthermore, the non-adhered portion is prevented from being crushed by the shallow second embossed e2 disposed between the adjacent first embossed els, el, and has a bulky feeling. And the shallow second embossed e2 is clear and 'clear', and there is no difference in appearance from the first embossed el and it has excellent aesthetics.

Industrial applicability

[0047] The present invention can be used in the manufacture of a product using two embossed sheet-like materials.

Brief Description of Drawings

FIG. 1 is a cross-sectional view illustrating an embodiment of a thin paper product according to the present invention.

FIG. 2 is a cross-sectional view illustrating an embodiment of another thin paper product according to the present invention.

FIG. 3 is a schematic view of a pair of embossing rolls.

FIG. 4 is an enlarged view of the surface of a convex embossing roll that is effective in the present invention.

FIG. 5 is an enlarged view of the surface of another convex embossing roll that is effective in the present invention.

Explanation of symbols

[0049] 1 ················ Adhesive, el ... 1st emboss, Θ2 ··· 2nd emboss, 10 ··· Metal convex emboss roll, 20 ··· Elastic roll, Ε1 ··· 1 Embossed convex part, Ε2 ... Second embossed convex part, D1 ... 1st embossed depth, D2 '2nd embossed depth, D3' 1st embossed depth and 2nd embossed depth L1 ... Emboss separation distance, HI ... First embossing convex height, Η2 ... Second embossing convex height, Η3 ... First embossing convex height and Η2 ··· Height difference of 2nd embossing convex part, L2 'length of one side of top surface, L3' Embossed separation distance between convex parts, tl ... Top part of 1st embossing, t2 '2nd embossing Top, 頂 ···································································································.

Claims

The scope of the claims

[1] A thin paper product in which embossed thin paper is laminated,

[2] The tissue paper product according to claim 1, wherein the first emboss has a depth of 1 · 0 to 2 · Omm, and the second emboss has a depth of 0 · 80—1.3 mm.

[3] The depth difference between the first emboss and the second emboss is 0.2 mm or more and 0.7 mm or less.

The tissue paper product according to 1 or 2.

[4] The thin paper product according to any one of claims 1 to 3, wherein the bottom shapes of the first and second embosses are substantially the same, and the intervals between adjacent embosses are equal. .

[5] The thin paper product according to [4], wherein the separation distance between adjacent embosses is 1.7 to 3.3 mm.

[6] The thin paper product according to any one of [1] to [5], wherein the area ratio of the adhesive-applied portion in plan view is 3 to 15%.

[7] An embossing method for embossing a thin paper through a thin paper between a pair of embossing rolls,

At least one of the embossing rolls,

[8] The embossing of the thin paper according to claim 7, wherein the height of the first embossing convex portion is 1.0 to 2.0 mm, and the height of the second embossing convex portion is 0.80 to 1.3 mm. Method.

9. The thin paper embossing method according to claim 7 or 8, wherein the difference in height between the first embossing convex portion and the second embossing convex portion is 0.2 mm or more and 0.7 mm or less.

[10] Any one of claims 8 to 9, wherein the top surface shape of the first and second embossing projections is substantially the same, and the spacing between adjacent embossing projections is equal. The embossing method for thin paper according to the item.

[11] The embossing method for thin paper according to any one of [7] to [10], wherein the separation distance force between adjacent embossing convex portions is 1.7 to 3.3 mm.

[12] The area ratio of the adhesive-applied portion in plan view is 3 to 15%, any one of claims 7 to 11

The embossing method for thin paper according to item 1.

[13] The embossing method for thin paper according to any one of claims 7 to 12, wherein the embossing pressure is 5 to 30 kgf / cm.