KR20040072039A - Paper for upper layer of wallpaper - Google Patents

Abstract

PURPOSE: An upper layer of wallpaper is characterized by having excellent embossing and concealing properties, under 0.25-0.45g/cm¬3 of density and under 7% of average weight variable rate on a beta ray formation tester. The wallpaper printed by a gravure roll excellently is characterized by not using vinyl chloride, being environmentally friendly and having practicality. CONSTITUTION: An upper layer of wallpaper comprises a blend sheet containing 15-50wt.% of thermofusion synthetic fiber and 10-85wt.% of board-leaved tree solution pulp. The thermofusion synthetic fiber has 100-180deg.C of melting point.

Description

Wallpaper upper layer {PAPER FOR UPPER LAYER OF WALLPAPER}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to wallpaper upper layer papers, and in particular, to a wallpaper upper layer paper suitable for manufacturing by using a long paper machine.

Conventionally, vinyl chloride wallpaper is used as most wallpaper. This is because vinyl chloride is superior to other materials in terms of cost, design, workability, and the like. However, since the vinyl chloride used here is likely to generate dioxins when incinerated as waste, the transition from environmental considerations to "desinyl chloride" wallpaper is underway. Therefore, instead of vinyl chloride wallpaper, wallpaper and paper wallpaper on which a synthetic resin such as olefin resin is coated or bonded are increasing.

In general, the paper wallpaper is composed of two layers, an upper layer paper and a backing paper. Moreover, an adhesive agent and a heat-sealing film are used for adhesion | attachment of an upper layer paper and a backing paper, After bonding the upper layer paper and a backing paper, printing and embossing are performed on the paper itself, and it is constructed as a paper wallpaper. . In this case, since the main material of the paper wallpaper which used paper for upper layer paper is a cellulose material, it is excellent in an environmental aspect. On the other hand, when embossing, the structure tends to be dense, resulting in inferior volume and design.

In order to solve the said drawback, although the wallpaper upper layer paper which mixed wood pulp and synthetic fiber was proposed, in this case, there existed a drawback that it is difficult to obtain sufficient volume feeling of the thing which is good in bonding (patent document 1). This defect can be improved by increasing the blending of synthetic fibers, but the cost is high and the strength is weak. Moreover, although the paper mating and the slanting paper mating were good, the long mating paper which can produce paper at a low productivity with good productivity could not be obtained. In addition, by hardening wood pulp, the strength and consolidation became good, but in this case, a sense of volume could not be obtained. Thus, it has been difficult to manufacture wallpaper upper layer paper which has a sense of volume using a long-term paper machine, and is also good at bonding.

[Patent Document 1]

JP 2000-96495 A

MEANS TO SOLVE THE PROBLEM The present inventors earnestly examined in order to obtain the wallpaper upper layer paper which is excellent in a sense of volume, and good in bonding, and also has an embossing and hiding property. In this case, it was found that it is possible to obtain a good wallpaper upper layer paper, and the present invention was reached.

Accordingly, an object of the present invention is to provide a wallpaper upper layer paper which is excellent in consolidation and excellent in the environment, and excellent in concealability and designability, even in a long stick paper machine with a sense of volume.

The above object of the present invention has been achieved by a wallpaper upper layer paper composed of a blended sheet containing a heat-sealing synthetic fiber and broadleaf soluble pulp as a main material. It is preferable that the mixing ratio of said heat-sealing synthetic fiber is 15-50 weight%. The melting point of the heat-sealed fiber is preferably 100 to 180 ° C, the density as the wallpaper upper layer is 0.25 to 0.45 g / cm 3 or less, and the basis weight variation rate is preferably 7% or less.

As the heat-sealing synthetic fiber used in the present invention, it is preferable to use pulp multi-branched fibers excellent in embossability and concealability. As such a pulp-like multibranched fiber, it is preferable that it is a form which consists of liver fiber and the branch fiber branched from the said liver fiber (for example, patent document 2).

[Patent Document 2]

Japanese Patent Publication No. 2732483

The average fiber diameter of the liver fibers is preferably in the range of 0.5 to 5 μm, the average fiber diameter of the branch fibers is less than 0.5 μm, and the average fiber length from the tip of the branch fibers to the tip of the other branch fibers is 0.01 mm. It is preferable that it is a synthetic pulp of -10 mm. Preferable examples of such pulp-like multibranched fibers include polyolefin-based synthetic pulp sold by Mitsui Chemicals, Inc. under the trade name of SWP.

The dissolving pulp used in the present invention is a pulp obtained by highly purified alpha cellulose. In the case of sulfite dissolving pulp (DSP), the content of alpha cellulose is 89% by weight or more, and in the case of sulfate dissolving pulp (DKP). It means that content of alpha cellulose is 93 weight% or more (JIS P 2701).

Among the dissolving pulp, there are conifer dissolving pulp and broad leaf dissolving pulp. In terms of bulkiness, conifers having a large fiber diameter are advantageous, but conifers that are long fibers are difficult to secure good bonding compared to broadleaf trees. On the other hand, since the broadleaf soluble pulp is short fiber, it is advantageous in terms of bonding, and is superior in bulkiness to wood pulp. It is also possible to obtain bulkiness by removing the fine fibers. Therefore, in the present invention, broadleaf soluble pulp is blended as an essential component.

In the wallpaper upper layer paper of this invention, it is preferable that the ratio of the heat-sealing synthetic fiber is 15-50 weight%, and the ratio of the broadleaf soluble pulp is 10-85 weight%. If the ratio of the heat-sealable synthetic fiber is less than 15% by weight, the embossing performance is inferior, and even if it exceeds 50% by weight, the improvement of the quality due to the increase of the compounding amount cannot be expected, and there is no economic feasibility. It is easy to generate | occur | produce back, and its operability is also inferior. On the other hand, if the ratio of the broadleaf soluble pulp is less than 10% by weight, a feeling of volume or sufficient consolidation cannot be obtained, and if it exceeds 85% by weight, the heat-sealable synthetic fibers are not sufficiently blended, and thus the embossing property is inferior.

If it is the above structure, even if a long paper machine is used, paper with favorable paper bonding can be manufactured.

The tie can be measured by a beta ray tether.

The beta-ray cladding system used in the present invention is a device for measuring basis weight nonuniformity of a constant area using a lower basis weight having a higher transmittance of beta-rays. The lower the value of the measured basis weight variation, the better the retention. If the basis weight variation rate is 7% or less, it is a value sufficiently good as the lamination of the upper layer paper of the wallpaper.

In the present invention, pulp such as wood pulp, non-wood pulp, and other synthetic fibers can be blended in the range of 0 to 50% by weight in addition to the broadleaf soluble pulp. The wood pulp is, for example, chemical pulp (bleached kraft pulp (NBKP) of softwood, bleached kraft pulp (LBKP) of softwood, bleached sulfite pulp (NBSP) of softwood, etc.). , Chemical thermopulp (CTMP), etc.), deinking pulp (DIP) of good old raw materials, or chelated pulp subjected to alkali treatment at a high concentration can be selected.

The non-wood fibers can be selected from, for example, kenaf, jute, linter, manila, bamboo, straw, bagasse, esparto and the like. The synthetic fibers can be selected from, for example, polyethylene fibers, polyester fibers, acrylic fibers and various composite fibers.

The wallpaper upper layer paper of the present invention preferably has a density of 0.25 to 0.45 g / cm 3 or less in order to obtain a sufficient volume feeling. If the density is less than 0.25 g / cm 3, sufficient strength cannot be obtained, papermaking is difficult, and if it exceeds 0.45 g / cm 3, it is not possible to obtain sufficient embossability and volume.

When strength is required at the time of wallpaper bonding, it is preferable to mix the beaten wood pulp in a range not exceeding 0.45 g / cm 3. In order to make it bulkier, it is preferable to mix | blend a polyester fiber and the polyolefin composite fiber whose core part is a polyester fiber, and a sheath part is a polyethylene fiber.

In the present invention, the basis weight of the wallpaper upper layer paper is preferably 85 to 500 g / m 2. The upper layer paper is bonded to the backing paper as the upper layer paper supporting layer on the back side, and furthermore, it becomes a wallpaper by the structure which provided the adhesive layer with respect to the wall surface on the said backing paper surface as needed. The backing paper is commonly used for wallpaper, and the basis weight is preferably 65 to 80 g / m 2, but is not limited to this range.

The wallpaper upper layer paper of the present invention is produced by applying a print processing by a gravure printing roll or the like or an embossing processing by an emboss roll. In addition, the wallpaper is easily contaminated and abraded depending on its use, so that a synthetic resin emulsion can be applied or an EVOH film or the like can be bonded for the purpose of imparting antifouling resistance, abrasion resistance, or the like to the surface side.

EXAMPLE

Although an Example demonstrates this invention more concretely below, this invention is not limited by these. In addition, "%" represents "weight%" unless there is particular notice.

<Heat sealable synthetic fiber (raw material A)>

The raw material A was obtained by dissociating the polyolefin synthetic pulp (trade name: SWP E400, average fiber length 0.9 mm, density 0.96 g / cm 3, pulp-shaped multibranched fiber having a melting point of 135 ° C., manufactured by Mitsui Chemical Industries, Ltd.).

<Unresolved broadleaf soluble pulp (raw material B)>

The commercially available broadleaf soluble pulp LDKP whose average fiber length was 0.9 mm and content of alpha cellulose was 93.2% was dissociated, and raw material B was obtained.

<Confident LBKP (raw material C)>

LBKP (manufactured by Nippon Seishi Co., Ltd.) was subjected to beating using a double disc cleaner to obtain a raw material C having a Canadian standard freeness (hereinafter referred to as CSF) of 440 ml.

<Cotton linter pulp (raw material D)>

The commercially available cotton-printer pulp for paper was dissociated and then beaten using a double disc cleaner to obtain a raw material D having a CSF of 650 ml.

<Synthetic fiber (raw material E)>

Polyolefin composite fiber in which the core part is polyester fiber and the sheath part is polyethylene fiber (trade name: N710S, average fiber length 5mm, density 1.37g / cm 3, nonbranched fiber with melting point of 130 ° C, manufactured by Clare Co., Ltd.) Was dissolved to obtain the raw material E.

<Marselized pulp (raw material F)>

To an undissolved product of commercially available conifer bleached kraft pulp (NBKP (manufactured by Nippon Seishi Co., Ltd.)), an aqueous 15% sodium hydroxide solution was added so that the pulp concentration was 5%, and the mixture was immersed at 20 ° C. for 30 minutes to form micelles. . Next, the mixture was washed with water sufficiently and the pH was adjusted to 7 to obtain the raw material F. Moreover, the content rate of cellulose II was 100% in the obtained pulp. The CSF of this Marcellized pulp (raw material F) was 750 ml.

<Unrecognized NBKP (raw material G)>

Commercially available NBKP (manufactured by Nippon Seishi Co., Ltd.) was dissociated to obtain a raw material G having a CSF of 720 ml.

<Confident NBKP (raw material H)>

Commercially available NBKP (manufactured by Nippon Seishi Co., Ltd.) was subjected to a beating using a double disc refiner to obtain a raw material H having a CSF of 510 ml.

<Confident NBKP (raw material I)>

Commercially available NBKP (manufactured by Nippon Seishi Co., Ltd.) was subjected to beating using a double disc refiner to obtain a raw material I having a CSF of 600 ml.

Example 1

<Manufacture of wallpaper upper layer paper>

Adjust the blending weight ratio of the raw materials (A) and (B) to A / B = 15/85, add a sizing agent and an oil-impregnating agent, and press the paper sheet so that the basis weight is 100 g / m2 in a long paper machine. Thus, wallpaper upper layer paper was produced. The humidity of the produced sheet | seat was adjusted in constant temperature and humidity (23 degreeC, 50% RH). After the humidity adjustment, the density of the sheet was measured according to JIS P8118, and used as an index of bulkiness. In addition, the basis weight fluctuation rate was measured by using a beta-line formation tester (Beta-lined sum total) of Ambatex, and used as an index of the jam.

<Evaluation of Embossing>

On one side of the obtained processed paper, a backing paper having a basis weight of 65 g / m 2 was bonded to each other via an ethylene vinyl acetate copolymer resin adhesive, and the metal embossing roll was passed between the flat rubber roll and the surface of the embossing roll. The temperature was 210 degreeC, and the embossing was performed to the surface side of the sheet | seat. (Circle) when the unevenness | corrugation of the obtained embossing was clear, x was indefinite, and it was set as (triangle | delta) in the middle. The results are shown in Table 1.

Example 2

Except having made the ratio of raw material (A) and (B) into A / B = 45/55, it carried out similarly to Example 1, and evaluated bulky property, paper bonding, and embossing property. The results are shown in Table 1.

Example 3

Bulky properties, paper-bonding, and the like in the same manner as in Example 1 except that (A), (B) and (H) were used as raw materials and the ratio thereof was A / B / H = 45/15/40. The embossing property was evaluated. The results are shown in Table 1.

Example 4

In the same manner as in Example 1, except that (A), (B) and (C) were used as raw materials, and their ratio was set to A / B / C = 45/15/40, The embossing property was evaluated. The results are shown in Table 1.

Example 5

Bulkyness, crushing, and the like of Example 1 were used except that (A), (B) and (D) were used as raw materials and the ratio was set to A / B / D = 45/15/40. The embossing property was evaluated. The results are shown in Table 1.

Example 6

In the same manner as in Example 1, except that (A), (B) and (E) were used as raw materials and the ratio thereof was set to A / B / E = 45/45/10, The embossing property was evaluated. The results are shown in Table 1.

Comparative Example 1

Except having made the ratio of raw material (A) and (B) into A / B = 5/95, it carried out similarly to Example 1, and evaluated bulky property, paper bonding, and embossing property. The results are shown in Table 1.

Comparative Example 2

Bulking property, bonding, and embossing property were evaluated similarly to Example 1 except having used the raw material structure as (A) and (F) and making those ratio A / F = 45/55. The results are shown in Table 1.

Comparative Example 3

Bulking property, bonding, and embossing property were evaluated similarly to Example 1 except having used the raw material structure as (A) and (G) and making the ratio A / G = 45/55. The results are shown in Table 1.

Comparative Example 4

Bulking property, bonding, and embossing property were evaluated similarly to Example 1 except having used the raw material structure as (A) and (I) and making those ratio A / I = 45/55. The results are shown in Table 1.

Comparative Example 5

Bulking property, paper bonding, and embossing property were evaluated like Example 1 except having used the raw material structure as (A) and (C) and making those ratio A / C = 45/55. The results are shown in Table 1.

As is clear from Table 1, the upper wall paper of the present invention containing 15 to 60% of heat-sealable synthetic fiber and 10 to 85% of broadleaf soluble pulp is bulky and has good bonding even in long-term paper. It was proved.

The buckled upper layer paper of the present invention is a wallpaper upper layer paper having a density of 0.25 to 0.45 g / cm 3 or less and a basis weight variation rate of 7% or less in the beta-ray lamination system, and also having excellent embossability and concealability, and is easy to manufacture by a long paper machine. Do. In addition, it is a paper wallpaper excellent in print processing by gravure printing rolls and the like, and since vinyl chloride is not used, it is also excellent in environmental compatibility and extremely useful in practical use.

Claims (4)

A wallpaper upper layer paper composed of a honcho sheet containing a heat-sealing synthetic fiber and broadleaf soluble pulp as a main material. The wallpaper upper layer paper according to claim 1, wherein the content of the heat-sealing synthetic fibers is at least 15 to 50% by weight, and the content of the broadleaf soluble pulp is 10 to 85% by weight. 3. The wallpaper upper layer paper according to claim 1 or 2, wherein the heat-sealing synthetic fiber is a heat-sealing synthetic fiber having a melting point of 100 to 180 ° C and melting at the time of embossing. The wallpaper upper layer paper according to any one of claims 1 to 3, wherein the density is 0.25 to 0.45 g / cm 3, and the basis weight variation rate is 7% or less in the beta ray lamination system.