JP2008267125A - Paper floor curing material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a double-sided corrugated board type floor curing material regenerable into paper used for a paperboard after use, in the curing material for protecting a floor surface of a building under construction, particularly, a woody floor surface such as woody flooring. <P>SOLUTION: This paper floor curing material is composed of a double-sided corrugated board sheet of sticking water disaggregation type nonwoven fabric regenerable into the paper to at least one liner surface of the double-sided corrugated board sheet. The corrugated board sheet has a shock absorbing characteristic of setting the thickness to ≥3.0 mm and <6.0 mm, the total basis weight to 580-850 g/m<SP>2</SP>, a steel ball characteristic to ≥14 cm and a sharp bar characteristic to ≥5 cm. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a curing material for protecting a floor surface of a building under construction, in particular, a wooden floor surface such as wooden flooring, and relates to a double-sided cardboard type curing material that can be recycled to paper after being used. It is.

  As a curing material for the wooden floor of a building, a paperboard product in which foamed plastic is bonded to the back surface is commercially available. Although this floor curing material is excellent in the protection function of the wooden floor surface, etc., since the foamed plastic becomes a contraindicated product when the paperboard is recycled as used paper, it cannot be supplied to the paper recovery process after used.

  Further, as a paper floor curing material that can be recycled into paper used for paperboard or the like, one having a single-sided cardboard structure in which a reinforced core paper is bonded to a thick liner paper (for example, Patent Document 1) is known. However, the cushioning properties are inferior to those obtained by bonding the foamed plastic to the paperboard, and if the cushioning properties are increased to the same extent as those obtained by bonding the foamed plastic to the paperboard, Since it is necessary to increase the overall thickness, it may not be used at the site where there is a thickness limitation.

JP 2001-12082 A

The present invention has a floor surface protection function equivalent to that of a general-purpose product made of foamed plastic (incompatible paper used) and paperboard, and can be recycled into paper after being used as a curing material. The purpose is to provide a curing material for a certain wooden floor.
Another object of the present invention is to provide a thin and lightweight paper curing material for a wooden floor that is excellent in handling at a construction site.

  In order to solve the above problems, the present invention has a basic structure in which a nonwoven fabric is attached to the surface of at least one liner of a double-sided cardboard, and the nonwoven fabric is similar to a paper-made double-sided cardboard sheet. A paper floor curing material useful for protecting a wooden floor of a building as described below, characterized in that it uses a nonwoven fabric formed of a material that is water disintegrating and recyclable into paper Relates to an invention selected from:

(1) A paper floor curing material comprising a double-sided cardboard sheet in which a water-releasable nonwoven fabric that can be recycled on paper is bonded to at least one liner surface of the double-sided cardboard sheet.

(2) corrugated fiberboard sheet having a liner adhered to said nonwoven fabric is a thickness less than or more 3.0 mm 6.0 mm, the total basis weight of 850 g / ^{m 2} or less, is preferably 580~850g / ^{m 2} The paper floor curing material according to item (1).

(3) A paper having a thickness of 0.8 to 1.3 mm and a basis weight of 20 to 70 g / m ² , wherein the nonwoven fabric is formed of a cellulose-based pulp fiber and a water-soluble or water-disintegratable adhesive. The paper floor curing material according to item (1) or (2), which is a recyclable nonwoven fabric.

(4) The paper floor curing material according to any one of items (1) to (3), wherein the cellulosic pulp fibers are wood pulp.

(5) The non-woven fabric is bonded to the surface of the liner with a water-soluble or water-disintegrating adhesive, and is made of paper according to any one of items (1) to (4) Floor curing material.

(6) The double-sided cardboard sheet has a step height of 2.3 to 2.7 mm, a number of steps of 38 mountains / 30 cm to 52 mountains / 30 cm, and a step rate of 1.2 to 1.4. The paper floor curing material according to any one of items (1) to (5), which is a double-sided cardboard sheet having an intermediate core.

(7) The paper floor curing material according to any one of items (1) to (6), wherein the steel ball characteristics are 14 cm or more and the sharpened rod characteristics are 5 cm or more.
[However, the numerical values related to the “steel ball characteristics” and “sharp bar characteristics” of the floor curing material are the steel ball characteristics test described as <Test Method 1> in the Examples of the present specification, and <Test Method 2>. Means a measured value based on a sharp bar characteristic test described as ]

(8) One side of the double-sided liner of the corrugated cardboard sheet is made of a paper having a liner having a reusable water disintegrating nonwoven fabric bonded to a paper having a thickness of 1 mm or more on the surface side, and the other liner having a flexographic printable surface. The paper floor curing material according to any one of items (1) to (7), comprising a liner.

(9) The paper floor curing material according to any one of (1) to (8), wherein a folding ruled line is provided on the double-sided cardboard sheet.

  The floor curing material of the present invention is a double-faced corrugated cardboard structure having excellent compression resistance and impact resistance, and a nonwoven fabric layer that is a flexible and bulky network structure is applied to the liner surface on the floor surface to be protected. It has sufficient shock-absorbing characteristics that can protect the floor from impacts caused by falling objects and heavy loads, and sand particles that are often scattered on the floor to be protected at the construction site. Such a small solid material is also incorporated into the nonwoven fabric layer and has a function of effectively preventing the floor surface to be protected from being damaged by the small solid material.

  The floor curing material of the present invention uses only a water disintegratable non-woven fabric and paper liner that can be recycled on paper, and does not use a foam plastic sheet and plastic film, which are contraindicated for waste paper. After being used as a curing material, it can be recovered through normal waste paper recovery routes and recycled to paper.

In addition, since the non-woven fabric stuck to the liner has a cushioning property that is more flexible and superior to paperboard of the same basis weight, the paper floor curing material of the present invention simply reduces the basis weight of the paper liner. Compared with the case where it is increased, the basis weight (weight per unit area = g / m ² ) can be improved without excessively increasing the buffer characteristics of the double-sided corrugated cardboard sheet. The burden is small.

The paper floor curing material of the present invention is used by laying on the floor of the building in order to protect the floor of the building under construction, particularly the wooden floor, from scratches or contamination, etc. In addition to having the property and rigidity, it is configured for the purpose of having a surface having a flexibility that does not damage the floor surface to be protected.
Therefore, the floor curing material of the present invention is excellent in a double-sided cardboard which is a structure excellent in cushioning characteristics such as compression resistance and impact resistance, and a flexible and bulky cushioning property which hardly damages the floor surface to be protected. It is comprised by combining with the nonwoven fabric which is a net-like structure.
Also, as a non-woven fabric to be bonded to the liner surface of double-sided cardboard made of paper so that it can be recovered as used paper as it is after use, it can be recycled with a fiber material recyclable on paper and a water-soluble or water-disintegratable binder The produced nonwoven fabric is used.

  As the double-sided cardboard sheet part constituting the floor curing material of the present invention, it is impact resistant to absorb shocks caused by falling objects and the like that may occur in a normal construction site while being laid on a wooden floor of a building. And cushioning characteristics such as compression resistance that can prevent the floor surface from being irreversibly deformed by a load such as an air compressor, etc. As long as it is of a size that does not hinder use at each construction site or can be processed to be foldable into that size, it is a double-sided cardboard with a special specification that is produced according to the commercial product and intended use Either of these can be used.

  The gap between the door and floor of a general building under construction is usually 6.0 mm or less, and most is about 5.5 mm or less, so it is also used as a floor curing material for the above general buildings. In order to be able to do so, the total thickness of the double-sided corrugated cardboard sheet in which the nonwoven fabric is bonded to the one-side liner surface constituting the floor curing material of the present invention is preferably 6.0 mm or less, and particularly preferably 5.5 mm or less. . If it is thicker than 5.5 mm, when the door is opened, the lower end of the door may interfere with the building interior work in addition to the curing material laid on the floor, and in order to satisfy certain buffer characteristics In view of the necessity of a thickness of 3 mm, it is particularly preferable to set the thickness in the range of 3.0 to 6.0 mm when commercializing as a single standard curing sheet.

Moreover, since the weight of a normal floor curing material including a packing box at the time of packing 20 sheets is 30 kg or less, preferably 25 kg or less is desired by the operator, the floor curing material of the present invention is 20 sheets. as weight including the packing box during packing becomes 30kg or less, the basis weight 850 g / ^{m 2} or less, particularly preferably to ^{580g / m 2 ~850g / m 2} , more preferably 580 g / m The range is ^{2 to} 770 g / m ² .

The double-sided corrugated cardboard sheet constituting the paper floor curing material of the present invention has the above-mentioned constant buffering characteristics, and has an overall thickness of 6.0 mm or less, preferably 5.5 mm or less. In order to produce a double-sided cardboard sheet having a basis weight of 850 g / m ² or less, the step height is 3.0 mm or less, preferably 2.3 to 2.7 mm, and the number of steps is 50 ± 2 mountains / 30 cm. A corrugated core having a flute or a step height of 3.0 mm or less, preferably 2.3 to 2.7 mm, and a C flute having a number of steps of 40 ± 2/30 cm is preferable. These cores generally have a step rate of 1.2 to 1.4.
Since the flute step height is 3.0 mm or less, preferably 2.3 to 2.7 mm, the number of C flute steps is the same as that of the B flute. This has the effect of reducing the total mass of the cardboard sheet.

As the core, a normal core having a basis weight of 100 to 200 g / m ² , a water-resistant core, a reinforced core, and the like can be used. Since the imported liner and the reinforced core are both stronger than ordinary base paper, there is an advantage that the buffering characteristics can be improved without increasing the mass of the entire curing material.
The water-resistant liner and the water-resistant core are used for the floor curing material in the present invention requiring water resistance.

It is preferable to use a liner having a basis weight of 160 to 350 g / m ^{2 for} the double-sided cardboard. In order to suppress the basis weight of the entire curing material made of double-sided corrugated cardboard sheets to 850 g / m ² or less, the double-sided liner has an overall basis weight that exceeds the above numerical values, including the core, nonwoven fabric, and adhesive used. As long as the total thickness can be maintained at a predetermined thickness, liners having different basis weights, different thicknesses, and different strengths can be used in any combination. For example, one liner uses a high-strength imported liner having a basis weight of 337 g / m ² , which is generally considered to be high strength, and the other liner uses a domestic liner having a basis weight of 170 g / m ^2. It is also possible.

The nonwoven fabric used by being bonded to the double-sided cardboard liner used as the floor curing material of the present invention is a cellulose pulp fiber component that is disaggregated in a used paper disaggregation device and regenerated as paper, and a binder that is disaggregated in the disaggregation device It is the nonwoven fabric formed from the component. Chemical fibers, such as rayon, and fibers, such as heat-fusible synthetic fibers, are contraindicated when recovered as waste paper and are not included in substantial amounts.
Cellulose pulp fibers that can be recycled as paper include plants such as bast fibers, seed hair fibers, leaf fibers, and grass fibers in addition to wood pulp such as conifers and hardwoods that are usually used as paper pulp. Non-wood pulp made of fibers can be mentioned.

When the nonwoven fabric is bonded to the liner surface on one side of the cardboard, the basis weight of the nonwoven fabric is 20 to 70 g from the relationship between the weight and thickness of the entire curing material and the relationship between the cushioning properties and the surface cushioning properties. / M ² and its thickness is preferably 0.8 to 1.3 mm.

The floor curing material of the present invention has a steel ball characteristic value of 14 cm or more, preferably 16 cm or more, and a sharp bar characteristic of 5 cm or more, preferably 6 cm. That's it.
In the present invention, the numerical values of “steel ball characteristic test” and “sharp rod characteristic” relating to the above-mentioned cushioning property of the floor curing material are the steel ball characteristic test of <Test Method 1> and <Test Method 2> described in Examples below. Defined as a numerical value obtained by measuring in accordance with the sharp rod characteristic test.

The floor curing material of this invention is manufactured according to the following manufacturing methods, for example.
First, a nonwoven fabric to be attached to a double-sided cardboard liner is prepared as a water disintegrating nonwoven fabric having a basis weight of 70 g / m ² or less using a cellulose pulp fiber and a water-soluble resin as a binder.
This nonwoven fabric is manufactured, for example, by a method called an air array method. That is, after the cellulose pulp is defibrated into a single fiber in a dry state, it is blown with a large amount of air, and the web is continuously formed by leaving only the fiber on the wire in the web forming apparatus. Furthermore, after spraying a water-soluble resin binder, it is dried and wound up.

  Water-soluble resin binders to be sprayed include water-soluble polymers called pastes such as casein, starch, sodium alginate, hydroxyethylcellulose, sodium carboxymethylcellulose, and water-soluble synthetics such as polyvinyl alcohol and sodium polyacrylate. Polymers can be used. In addition, when it is necessary to provide a certain level of water resistance and strength without impairing the water disintegration property of the nonwoven fabric, a synthetic resin emulsion such as an acrylic emulsion can be used in combination.

Next, the nonwoven fabric and a liner having a basis weight of 350 g / m ² or less are bonded together using a water-based resin binder, and a nonwoven fabric laminated liner is prepared. In this case, when the nonwoven fabric laminate liner is used only on one side of the corrugated cardboard sheet using the curing material of the present invention, the basis weight of the nonwoven fabric is 70 g / m ² or less.
As the water-based resin binder used for bonding, a resin binder of the same type as the water-soluble resin binder used when the nonwoven fabric is produced can be used.

Next, the nonwoven fabric laminate liner produced as described above and the corrugated core are bonded using a starch-based adhesive or a starch-based water-resistant adhesive, which is a normal water-based adhesive for corrugated cardboard, and the floor curing of the present invention. The material is manufactured.
This bonding process is performed using a corrugator which is a normal corrugated board manufacturing machine. As for the usage-amount of the adhesive agent for bonding, about 6-10 g / m < ² > is common.
In addition, if necessary, by flexographic printing, which is usually used for printing on the corrugated cardboard liner surface, on the surface of the liner on which the nonwoven fabric of the floor curing material consisting of the nonwoven fabric laminate liner, ordinary liner and corrugated core is not bonded, In addition to the name and lot number, the grid is printed to make the floor curing material suitable for cutting and construction according to the shape of the floor.

  In addition, when a ruled line for folding is put in the floor curing material, folding at the time of construction or dismantling becomes easy and workability is improved. Since the size of the floor curing material is usually about 0.9 × 1.8 m, which is the size of one tatami mat, it may be difficult to handle. Even in such a case, by folding it in half along the ruled line in advance and making it the size of a half tatami mat, convenience at the time of shipment / transportation and further loading into a narrow entrance room at the construction site is increased.

  EXAMPLES Hereinafter, although this invention is demonstrated according to an Example, this invention is not limited by these Examples.

<Example 1>
Wood pulp fiber (manufactured by Oji Paper Co., Ltd., NBKP 100%, number average fiber length 5 mm) and polyvinyl alcohol as a water-soluble resin binder are used, and water disintegration with a basis weight of 60 g / m ² and a thickness of 1.2 mm is obtained by the air array method. A non-woven fabric was prepared.
Next, the nonwoven fabric and a liner having a basis weight of 180 g / m ² (Oji Paperboard: OFK180) were used as a binder and a vinyl acetate-based adhesive was used to bond them at a coating amount of 10 g / m ² (solid content). A nonwoven fabric laminate liner with an amount of 250 g / m ² was prepared.
Next, in a corrugator, the nonwoven fabric laminate liner is used on the SF (single facer) side, and a reinforced core (basis weight 160 g / m ² ) manufactured by Oji Paperboard is used as the core, and DF (double facer). ) “OFK280” liner manufactured by Oji Paperboard Co., Ltd. with a basis weight of 280 g / m ² is used for the side liner, and a general starch paste is used as a bonding adhesive on both sides in total 8 g / m ² (solid content). A 4.4 mm B flute double-sided cardboard sheet was prepared and used as a floor curing material having a total basis weight of 754 g / m ² .

<Example 2>
The same procedure as in Example 1 was performed until the nonwoven fabric laminate liner having a basis weight of 270 g / m ² was produced. Use a non-woven laminate liner on the SF side and a reinforced product made by Oji Paperboard Co., Ltd. on the SF side, using a step roll with a step height of 2.6 mm and a number of steps of 39/30 cm. "SK280" liner (water-resistant base paper) manufactured by Oji Paperboard Co., Ltd. with a basis weight of 280 g / m ^{2 for} the core (basis weight 160 g / m ² ), DF side liner, and water-resistant starch paste for the pasting adhesive total 8 g / A double-sided corrugated cardboard sheet having a thickness of 4.4 mm was prepared using each of m ² (solid content) and used as a floor curing material having a total basis weight of 756 g / m ² .

<Example 3>
Using the same cellulose pulp fiber as in Example 1 and polyvinyl alcohol as a water-soluble resin binder, a water disintegrating non-woven fabric having a basis weight of 35 g / m ² and a thickness of 0.9 mm was prepared by an air array method.
Next, the nonwoven fabric and an imported liner having a basis weight of 337 g / m ² (Warehouse Hauser “K liner”) are used as a binder and bonded using a vinyl acetate adhesive 10 g / m ² (solid content), A nonwoven fabric laminate liner having an amount of 382 g / m ² was prepared and used as a DF side liner.
Next, a vinyl acetate-based adhesive 10 g / m ² (with a basis weight of 35 g / m ² and a thickness of 0.9 mm) and a liner having a basis weight of 170 g / m ² (manufactured by Oji Paperboard Co., Ltd .: OFK170) as a binder. The non-woven fabric laminate liner having a basis weight of 215 g / m ² was prepared and used as the SF side liner.
Next, in the corrugator, the SF side liner is on the SF side, the core is a reinforced core (basis weight 160 g / m ² ) made by Oji Paperboard, and the DF side liner is used for bonding on the DF side. A general starch adhesive 8 g / m ² was used as an adhesive, and a B flute double-sided corrugated cardboard sheet having a thickness of 4.7 mm was prepared as a floor curing material having a total basis weight of 821 g / m ² .

<Comparative Example 1>
Current commercial product: Ecoful Guard (made by Fukubi Chemical Industry), composition = embossed plastic film + recycled paper (about 1 mm) + foamed polyethylene sheet (about 2 mm) single sheet (thickness about 3 mm, basis weight 800 g / m ² ).

<Comparative example 2>
In the corrugator, the SF side corrugated roll uses a general B flute corrugated roll, the SF side and DF side liners have a basis weight of 280 g / m ² "OFK280" liner made by Oji Paperboard Co., Ltd. Reinforced core (basis weight 160 g / m ² ) manufactured by Oji Paperboard Co., Ltd., and a common starch flute 8 g / m ² each for the adhesive for bonding, both sides of a normal B flute with a thickness of 3.2 mm A corrugated cardboard sheet was prepared and used as a floor curing material having a total basis weight of 784 g / m ² .

<Comparative Example 3>
In the corrugator, the SF side corrugated roll uses a general B flute corrugated roll, the SF side and DF side liners are imported (Warehouse “K liner” basis weight 337 g / m ² ), and the core is Reinforced core (basis weight 160g / m ² ) manufactured by Oji Paperboard Co., Ltd., and a normal starch adhesive 8g / m ² is used for the adhesive for bonding, respectively. Corrugated cardboard was prepared and used as a floor curing material having a total basis weight of 898 g / m ² .

<Comparative Example 4>
In the corrugator, use a general A flute corrugated roll for the SF side corrugated roll, and the “OFK280” liner made by Oji Paperboard with a basis weight of 280 g / m ² on the SF side and DF side liner. Made a normal A flute using a prince paperboard reinforced core (basis weight 160 g / m ² ) and a general starch adhesive 6 g / m ² as the adhesive for bonding, both sides having a thickness of 5.6 mm A corrugated cardboard sheet was prepared and used as a floor curing material having a total basis weight of 814 g / m ² .

<Comparative Example 5>
In the corrugator, the SF side corrugated roll uses a general B flute corrugated roll and a general A flute corrugated roll, and the SF side and DF side liners have a basis weight of 280 g / m ² prince paperboard OFK280 liner, medium core. (General core made by Oji Paperboard Co., Ltd .: basis weight 120 g / m ² ), Medium liner (General core made by Oji Paperboard Co., Ltd .: basis weight 120 g / m ² ), Medium core (General core made by Oji Paperboard Co., Ltd .: The basis weight is 120 g / m ² ), and the adhesive for bonding uses a total of 14 g / m ² of a general starch adhesive, and is a double flute (BA having a K280 * S120 * S120 * S120 * K280 configuration with a thickness of 8.1 mm). A floor curing material having a total basis weight of 1042 g / m ² was prepared.

<Result>
About the floor curing material of an Example and a comparative example, recyclability, a buffer characteristic (steel ball characteristic, a sharp-rod characteristic), a thickness characteristic, and a weight characteristic were evaluated. The results are shown in Table 1.

* 1) “Yes” indicates that the used paper can be recycled after use, and “No” indicates that the paper cannot be recovered.
* 2) In the overall evaluation of the buffer characteristics, among the steel ball characteristics = 16 cm or more and the sharpened rod characteristics = 6 cm or more, both achievement is ◯, one achievement is Δ, and both are not achievement ×.
* 3) When the sheet thickness is 5.5 mm or less, the sheet thickness exceeds 5.5 mm.
* 4) sheet basis weight ○ less than 770 g / ^{m 2,} a ^{770g / m 2 ~850g / m 2} △, and × those greater than 850 g / ^{m 2.}

As is clear from Table 1, the floor curing materials of Examples 1 to 3 have all of the important characteristics of recyclability, buffer characteristics, and thickness characteristics being ◯.
On the other hand, Comparative Examples 1, 2, 4, and 5 have x evaluation as one or more important characteristics. Comparative Example 3 has a weight characteristic of x, is too heavy, and places a heavy burden on the operator, and is very difficult to actually use as a floor curing material.

  In addition, the test method about "steel ball characteristic" and "sharp rod characteristic" which show the buffer characteristic of the floor curing material of this invention is as follows.

<Test Method 1> Steel Ball Characteristic Test The steel ball characteristic test is a test apparatus having the configuration shown in FIG. Place the steel ball and place the pipe with the steel ball inside the pipe.
Next, the fall height is determined by the support pin, and the weight for the steel ball is placed on the support pin, and the test is started.
In the test, the support pin is pulled out of the pipe, the steel ball weight is dropped from a predetermined height, and it is confirmed whether or not carbon adheres to the white plywood by the impact of dropping the steel ball weight.
The highest height at which carbon does not adhere to the white plywood is the steel ball characteristic.

<Test method 2> Pointed bar characteristic test
The sharp bar characteristic test is carried out by placing a test floor curing material on a white plywood, placing a sharp bar, and supporting it with a rubber column in the test apparatus configured as shown in FIG.
Next, the pipe is placed with the sharp rod inside the pipe, the drop height is determined by the support pin, the weight for the sharp rod is placed on the support pin, and the test is started.
In the test, pull out the support pin from the pipe, drop the sharpened rod weight from the specified height, and check whether the sharpened rod tip is damaged or not by the impact of the sharpened rod weight dropping. To do.
The highest height at which the tip of the sharp bar is not damaged on the white plywood is defined as the sharp bar characteristic.

  The present invention can be used as a curing material for a floor of a building under construction, particularly a wooden floor surface. Further, after being used, it can be collected by a normal waste paper route and recycled to paperboard or the like.

It is a block diagram of the apparatus of a steel ball characteristic test. It is a block diagram of the apparatus of a sharp-stick characteristic test.

Claims (6)

  A paper floor curing material comprising a double-sided cardboard sheet in which a water-releasable nonwoven fabric that can be recycled on paper is bonded to at least one liner surface of the double-sided cardboard sheet. ^2. The paper floor covering material according to claim 1, wherein the double-sided corrugated cardboard sheet having a liner bonded with the nonwoven fabric has a thickness of 3.0 mm or more and less than 6.0 mm and a total basis weight of 580 to 850 g / m ² or less. . The nonwoven fabric is formed of cellulosic pulp fibers and a water-soluble or water-disintegrable adhesive, and can be recycled into paper having a thickness of 0.8 to 1.3 mm and a basis weight of 20 to 70 g / m ^2. It is a nonwoven fabric, The paper floor curing material of Claim 1 or 2 characterized by the above-mentioned.   The double-sided corrugated sheet has a core having a step height of 2.3 to 2.7 mm, a number of steps of 38/30 cm to 52/30 cm, and a step rate of 1.2 to 1.4. The paper floor covering material according to any one of claims 1 to 3, which is a double-faced cardboard sheet.   The paper floor curing material according to any one of claims 1 to 4, wherein the steel ball characteristics are 14 cm or more and the sharpened rod characteristics are 5 cm or more.   The paper floor curing material according to any one of claims 1 to 5, wherein a folding ruled line is provided on the double-sided cardboard sheet.