JP3320409B1 - Cardboard curing sheet - Google Patents

Abstract

[Abstract] [Problem] To prevent damage and dirt of materials such as building materials and parts brought inside a building under construction or around a construction site,
Or floors, walls, etc.
Provided is a paperboard curing sheet for preventing damage and dirt on interior surfaces such as pillars and stairs. SOLUTION: The thickness is 1.0 to 5.0 mm and the density is 0.30.
A predetermined-shaped concave portion and a convex portion are independently formed by press working on the entire front surface and the rear surface side of the paperboard of ０．９0.90 g / cm ³ , and each of the predetermined-shaped concave portion and the convex portion is A paperboard curing sheet, characterized in that at least a part thereof has a portion extending in a width direction crossing a flow direction of the paperboard.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to processed paper for protecting building materials, that is, to prevent damage and dirt of materials such as building materials and parts brought into the interior of a building under construction and around construction sites, or to move luggage. The present invention relates to a paperboard curing sheet for preventing the interior surfaces such as floors, walls, pillars, stairs and the like from being damaged or stained by taking in and out.

[0002] In civil engineering work, after concrete or mortar is poured, cracks are prevented on the casting surface, moisture is retained,
Concrete curing sheets for preventing freezing are known, but concrete curing dislikes low temperatures and drying in order to obtain appropriate hardening strength, and because ventilation and heat shielding are important, air permeability is low. Even so, there are almost no examples in which paper alone is used for concrete curing, and blankets, polyethylene sheets, or laminates thereof have been generally used. The “curing sheet” of the present invention is not such a special “curing sheet”, but means a curing sheet made of paperboard which is suitably used for protection of floors and walls at construction sites, moving sites, and the like. .

[0003]

2. Description of the Related Art Processed paper for protecting building materials called "curing sheet" is widely used to protect already finished parts from damage or contamination during construction until the building is completed. It's being used. Conventional curing sheets are mainly processed plastic sheets such as PVC and polyethylene, and in places where cushioning is required, the use of foamed plastic products has been common, but recently, As plastic substitutes, those using a laminated paper having a paper surface treated with a film made of polyethylene as a base material and a curing sheet subjected to an embossing treatment for imparting a buffering property have become mainstream.

[0004] However, due to the growing interest in the problem of harmful dioxins due to the reduction of garbage and the incineration of garbage, and the problem of collection and reuse as resources, sheet processed products using the above-mentioned plastics. And film-processed products or paper-plastic composite products tend to be shunned year by year. Separation of paper and film is not impossible as a material recycling technology, but recycling requires special equipment and energy, and the separated paper and films are of little value as recycled resources. Therefore, after all, they are incinerated or landfilled as waste.

[0005] Curing sheets using only paper as a material have recently been proposed. Japanese Patent No. 3061615 discloses a core base paper for cardboard having a basis weight of 50 to 250 g / m ^{2 and} a liner for cardboard obtained by adding or applying a sizing agent, a watering agent, an anti-slip agent, and a waterproof agent. It is described that paper obtained by applying flute processing to base paper such as kraft paper to give extensibility can be used as a curing sheet. However, these cured sheets have a paper density of 0.6.
When it is 6 g / cm ³ , the thickness of the paper is only 0.38 mm, and there is a problem that it is too thin as a curing sheet.

[0006] In the interior construction work of a building, floor, wall and ceiling work is required. First, finish work is performed on the floor work, and thereafter finish work on the wall and ceiling is performed. Carpets, plastic tiles, flooring, etc. are used as finishing materials in floor work, but flooring is often used in modern residential buildings, so tools such as hammers, screwdrivers, cutters, etc. are used during wall and ceiling construction. If the sheet is mistakenly dropped on a wooden floor or a soft plastic tile, a problem occurs that the floor is damaged if the curing sheet is thin. Further, the ordinary curing sheet has a problem that the curing sheet slips because the paper is thin, the weight per unit area is light, and the frictional resistance is small.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a case where tools such as a hammer, a screwdriver and a cutter are accidentally dropped onto a wooden flooring or a soft plastic tile while a wall or a ceiling is being constructed. Another object of the present invention is to provide a curing sheet that does not damage the floor surface. Another object of the present invention is to provide a curing sheet that does not slide and move even when a worker who finishes a wall or ceiling on a curing sheet laid on a floor shifts weight.

Further, an object of the present invention is to provide a curing sheet in which an end face of a curing sheet laid on a floor surface is warped and a worker finishing work on a wall or a ceiling does not trip over the curved end face and fall. Aim. Furthermore, there is provided a cured sheet that can be collected and reused as used paper without being incinerated or landfilled, such as a cured sheet made of a conventional film or a cured sheet made of paper and film. Aim.

[0009]

Means for Solving the Problems The inventor diligently studied means for solving the above-mentioned problems, and as a result of repeated experiments, completed the present invention. The present invention includes the following inventions.

(1) Thickness 1.0 to 5.0 mm, density 0.
A predetermined-shaped concave portion and a convex portion are independently formed by press working on the entire front surface and the rear surface side of the paperboard of ^{30 to} 0.90 g / cm ³ , and each of the predetermined-shaped concave portion and the convex portion is A paperboard curing sheet having at least a portion extending in a width direction with respect to a paperboard flow direction.

(2) The paperboard curing sheet according to (1), wherein the shape of the uneven portion is at least one selected from a parallel linear shape, a triangular shape, a quadrangular shape, a polygon having five or more pentagonal shapes, and a circular shape. .

(3) The irregularities are formed in a continuous line or a discontinuous line in a direction intersecting the flow direction of the paperboard, and are arranged alternately in the flow direction of the paperboard. The paperboard curing sheet according to the above (1) or (2), which is characterized in that:

(4) The uneven portion extends from 1 to 20 mm extending over the entire width of the paper in a direction perpendicular to the flow direction of the paperboard.
The paperboard curing sheet according to item (3), wherein the sheet is a parallel linear uneven portion having a width of 20 to 200 mm.

(5) The uneven portions are parallel linear uneven portions extending in a direction intersecting the flow direction of the paperboard, and parallel linear uneven portions extending in a direction intersecting the parallel linear uneven portions. The paperboard curing sheet according to any one of the above items (1) to (4), wherein the sheet is formed in a lattice by the portions.

(6) When the rate of increase in the static friction coefficient of the cured sheet made of paperboard as compared with paperboard is 9% or more as a numerical value of the coefficient of static friction in the paper flow direction measured according to the “inclination method” in JISP8147. (1)
The paperboard curing sheet according to any one of the above items 5 to 5.

(7) The cured sheet made of paperboard according to any one of the above (1) to (6), wherein the paperboard is water-resistant paper.

(8) The paperboard weighs 680 to 2040 g of rice
/ M ² , the water absorption by the Cobb method water absorption test is 100 g / m ² or less on both sides, and the burst strength is 1000 kPa or more, described in any one of items (1) to (7). Curing sheet made of paperboard.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing one embodiment of a paperboard curing sheet of the present invention. FIG. 1 is a perspective view of a paperboard curing sheet 1 of the present invention. In the paperboard 2, a groove (recess) 3 is formed by pressing from the front surface side and a convex portion 4 corresponding to 3 is formed on the back surface opposite to the groove, and a groove (recess) is formed by pressing from the opposite back surface side. 5 and a convex portion 6 corresponding to 5 are formed on the surface side. FIG. 2 shows FIG.
Surface-side concave portions 3 to 3 (back-side convex portions 4 to
4) shows an interval (pitch) P of 4), an interval (pitch) Q of the concave portions 5 to 5 on the back side (the convex portions 6 to 6 on the front surface), a width c of the concave portion, and a width d of the convex portion.

The concave portion 3 and the convex portion 4 facing each other between the front and back surfaces,
An uneven portion is formed on the paperboard 2 by press working to form the concave portion 5 and the convex portion 6, and the paperboard on which such an uneven portion is formed has an uneven portion formed on the back surface of the paperboard. It becomes a hooked part with the uneven part, and it acts to increase the sliding friction resistance between the paperboard sheet and the floor surface, and the uneven part on the paperboard surface increases the frictional resistance with the worker's work shoes and slides Will be achieved.

FIGS. 1 and 2 show an example in which only parallel grooves intersecting at right angles to the paperboard flow direction are formed. However, in order to provide an effect of preventing slippage in directions other than the flow direction, FIG. It is more effective to provide a groove parallel or inclined to the flow direction of the paperboard so as to cross a groove formed parallel to the flow direction at right angles.

In addition, the pulp fiber group oriented in the flow direction of the paperboard is compressed at predetermined intervals in the length direction and bent into a loop shape by the formation of the unevenness by press working, so that the pulp fiber absorbs moisture and is dried. Even if the pulp fiber expands and contracts to some extent, the curved portion absorbs the change amount, and the effect of preventing the warpage occurring at the flow direction end of the entire paperboard can be expected,
This effect, in addition to imparting water resistance to the paperboard itself, rises due to changes in humidity in the laid state, and warpage does not occur, and it is possible to provide a paperboard cured sheet that can maintain a safe working environment. It also has a positive effect.

(Paperboard) The cured paperboard sheet of the present invention has a thickness of 1.0 to 5.0 mm and a density of 0.30 to 0.90 g / c.
The base material is a paperboard having an m ³ , a basis weight of 680 to 2040 g / m ² , a cup method water absorption test (both front and back) of 100 g / m ² or less, and preferably a burst strength of 1000 kPa or more.

[0023] The paperboard must be a paperboard having the above-mentioned thickness, rice basis weight, and preferably further having the above-mentioned bursting strength, from the viewpoint of the shock absorption required for the paperboard-cured sheet. Paperboard having such a thickness can be usually produced by laminating a plurality of paperboards having an appropriate thickness and basis weight. Further, it is preferable that the paperboard is water-resistant to prevent warping and floating due to dimensional change due to strength retention and moisture absorption-drying. It is preferable that the water-resistant paperboard is given a predetermined water resistance by internally adding a sizing agent and a water-resistant agent to the paperboard raw material. The length (the flow direction of the paperboard) and the width of the paperboard are appropriately set according to the purpose of use of the paperboard curing sheet.

(Pressing) In the cured paperboard sheet of the present invention, the purpose of forming the irregularities of a predetermined shape by pressing the paperboard is to improve the function of preventing slippage on the front and back surfaces of the paper as described above. And to prevent warping of the paperboard occurring at the end of the paperboard in the flow direction.

The shape of the concavo-convex portion can be a parallel linear shape, a crossed linear shape, a triangular shape, a square shape such as a square, a rectangle, a trapezoid, a rhombus, a polygonal shape of a pentagon or more, a circular shape, or the like. In any case, the uneven portion formed by the pressing pressure needs to have a portion crossing the paperboard flow direction, and is oriented in the paperboard itself and the paperboard flow direction. A loop-shaped curved portion is provided at intervals in the pulp fiber group.

The concavo-convex shape may be a straight line or a wavy line alternately arranged in parallel with the entire width of the paperboard in a direction perpendicular to the direction of flow of the paperboard, or may intersect with the linear or wavy-lined concavo-convex portion. It is preferably a lattice-shaped uneven portion further having a linear or wavy uneven portion.

The width of the concave portion or the convex portion is 1.0 mm to 20.0
mm, preferably 2.0 mm to 10.0 mm
Is particularly preferred. If the width is less than 1.0 mm, the strength is low, so that the front and back surfaces of the paperboard may be torn during press working, and the strength as a paperboard cured sheet may be reduced. On the other hand, if it exceeds 20.0 mm, the slip prevention function becomes insufficient, which is not preferable.

The interval between the concave portions and the concave portions or between the convex portions and the convex portions is 2
It is preferably from 0.0 mm to 200.0 mm, and 5
0.0 mm to 100.0 mm is particularly preferred. When the interval between the concave portions or between the convex portions is less than 20.0 mm,
Especially when the shape of the uneven portion is a shape other than the linear shape,
Adjacent concave portions and convex portions are too close to each other, which may cause tears on the front and back surfaces of the paperboard during press working, which is not preferable. On the other hand, if it exceeds 200.0 mm, the slip prevention function becomes insufficient, which is not preferable.

The process of forming irregularities on the cured sheet made of paperboard is performed by pressing pressure from both sides of the paperboard. There is no particular limitation on the press device for unevenness processing, as long as it is a device capable of forming a concave portion (groove) of the above dimensions on the front and back surfaces of the paperboard and forming a convex portion corresponding to the concave portion on the opposite surface. Can be performed by using a flat plate punching machine manufactured by Koshosha Iron Works.

[0030]

EXAMPLES Hereinafter, the present invention will be described in detail with reference to examples. However, the present invention is not limited to these examples, and various changes can be made within a range in which the object of the present invention can be achieved. .

The static friction coefficient of the paperboard and the cured sheet made of the paperboard in each of the examples was determined by the “inclination method” described in JISP8147 “Testing method of friction coefficient of paper and paperboard”.
In accordance with the above, a sheet under test with a weight of 1000 g is placed on a hardwood board surface, the hardwood board is inclined toward the flow direction of each sheet, and the angle at which the paperboard starts to slide is measured. Then, the numerical value is set to A, then the sheet to be tested is placed on the sheet for curing, and the same inclination test is carried out. Increase rate C of static friction coefficient of cured sheet against paperboard
(%). (B / A) × 100-100 = C (%)

Example 1 Paperboard: Rice basis weight 680 g / m ² , paper thickness 1.054 mm, density: 0.660 g / cm ³ , Cobb water absorption 30 g / m
² (front), 30 g / m ² (back), papermaking moisture 6.6% by weight,
Two water-resistant paperboards (Hokuyo Paper: FKH-680) are bonded together with a vinyl acetate resin adhesive, and the basis weight of the rice is 1360 g.
/ M ² , paper thickness 2.108 mm, Cobb water absorption 30 g / m ²
(Table), 30 g / m ² (back) laminated paper was manufactured, and the laminated paper was cut into dimensions of 720 mm in length and 1700 mm in width to obtain a paperboard.

Groove processing (press processing): A press machine (Koseisha Co., Ltd.) having a linear groove (recess) having a width of 7.5 mm perpendicular to the fiber flow direction and having a groove-to-groove spacing of 70 mm on the surface of the paperboard. (Manufactured by Iron Works) at a pressing pressure of 24 kg / cm ² in the entire width direction. Also, the paperboard is turned over, and a linear groove having a width of 7.5 mm perpendicular to the fiber flow direction is provided at an intermediate position between the grooves on the front surface and a gap of 70 mm between the grooves is formed. Put in the direction.

The water resistance of the pressed paperboard was measured by the Cobb method water absorption test. As a result, the surface was 30 g / m ² ,
The back surface was 30 g / m ² . The increase rate of the coefficient of static friction of the cured paperboard sheet made of the obtained pressed paperboard was 12.1% on the surface side as compared with the paperboard as a raw material,
It was confirmed that the back side was 12.5%.

Further, after the cured sheet made of paperboard is placed on a hard board surface and conditioned at 23 ° C. and 60% Rh, the end of the cured sheet made of paperboard is warped (the bent sheet end and the floor surface are not bent). Distance) was measured. The measured value is 30 mm for the cured sheet made of paperboard before processing and 0 m for the cured sheet after pressing.
m. The obtained cured board made of paperboard had sufficient water resistance, impact resistance, anti-slip property and anti-warpage property as a cured paperboard sheet as compared with the paperboard before press working.

Example 2 Paperboard: Rice basis weight 680 g / m ² , paper thickness 1.054 mm, density: 0.660 g / cm ³ , Cobb water absorption 30 g / m
² (front), 30 g / m ² (back) water-resistant paperboard (Hokuyo Paper:
FKH-680) Three sheets are stuck together with a vinyl acetate resin adhesive, the basis weight is 2040 g / m ² , and the paper thickness is 3.162 m.
m is manufactured and the bonded paper is 1000 mm long and 20 mm wide.
The paperboard was cut to a size of 00 mm.

Groove processing (press processing): A press machine (Koseisha Tekko Co., Ltd.) was formed on the surface of the paperboard with a linear groove (recess) having a width of 10.0 mm perpendicular to the flow direction of the paperboard and a distance of 100 mm between the grooves. (Made in Japan) at a press pressure of 24 kg / cm ² in the entire width direction. In addition, the paperboard is turned over, and at a middle position between the grooves on the surface and at right angles to the flow direction of the paperboard, 10.0 mm in width.
Was formed in the entire width direction from the back surface with a pressing pressure of a press with the distance between the grooves being 100 mm.

The water resistance of the processed paperboard was measured by the Cobb method water absorption test. As a result, the surface was 30 g / m ² and the back was 3 g / m ² .
It was 0 g / m ² . It was confirmed that the static friction coefficient increase rate was 9.4% on the front side and 9.7% on the back side as compared with the paperboard before processing. Also, the warpage of the edge after humidity control at 23 ° C. and 60% Rh (distance between the warped paperboard edge and the floor) is as follows:
The paperboard before processing was 25 mm, and the cured paperboard sheet after processing was 0 mm. The obtained cured sheet made of paperboard had sufficient water resistance, impact resistance, anti-slip property and anti-warpage property as a cured paperboard sheet.

[0039]

As described above, the present invention has a thickness of 1.0
～5.0Mm, density 0.30~0.90g / cm ^3,
Rice basis weight 680-2040 g / m ² , Cobb method water absorption test (both front and back) 100 g / m ² or less, burst strength 1000
By forming uneven grooves on a paperboard of kPa or more in a direction intersecting the flow direction of the paperboard, it is possible to provide a non-slip, water-resistant cured paperboard sheet.

Further, the present invention provides a paperboard curing sheet which can be recovered and reused as used paper after use without requiring separation of the paper and film unlike the conventional curing sheet made of paper and film. I was able to do it.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a paperboard curing sheet of the present invention.

FIG. 2 is an enlarged plan view showing an example of the paperboard curing sheet of the present invention.

[Explanation of symbols]

1: curing board made of paperboard, 2: paperboard, 3: concave part on the front side,
4: Back side convex part, 5: Back side concave part, 6: Front side convex part,
c: width of the concave portion, d: width of the convex portion, P: interval of the front side concave portion (back side convex portion), Q: interval of the rear side concave portion (front side convex portion).

Continued on the front page (72) Inventor Masamitsu Tomita 20-6 Tokuda, Nayoro, Hokkaido Hokuyo Paper Co., Ltd. Nayori Mill (58) Fields investigated (Int. Cl. ⁷ , DB name) E04G 21/30 B31D 3/04

Claims (8)

(57) [Claims] 1. A thickness of 1.0 to 5.0 mm and a density of 0.30.
~ 0.90g / cm ^ThreeFront and back sides of paperboard
The concave and convex parts of the specified shape are made independent by pressing
Each of the concave and convex portions having the predetermined shape.
At least partially intersects the paperboard flow direction
Characterized by having a portion extending in the width direction.
Paperboard curing sheet. 2. The paperboard curing sheet according to claim 1, wherein the shape of the uneven portion is at least one selected from the group consisting of a parallel linear shape, a triangular shape, a rectangular shape, a polygon having a pentagon or more, and a circular shape. 3. The method according to claim 1, wherein the uneven portions are formed in a continuous line or a discontinuous line in a direction intersecting with the paperboard flow direction, and are alternately arranged in parallel with the paperboard flow direction. The paperboard curing sheet according to claim 1, wherein the curing sheet is made of a paperboard. 4. The uneven portion is a parallel line-shaped uneven portion having a width of 1 to 20 mm and extending at an interval of 20 to 200 mm extending over the entire width of the paper in a direction perpendicular to the direction of flow of the paperboard. The paperboard curing sheet according to claim 3. 5. The uneven portion includes a parallel linear uneven portion extending in a direction intersecting a flow direction of the paperboard, and a parallel linear uneven portion extending in a direction intersecting the parallel linear uneven portion. The paperboard curing sheet according to any one of claims 1 to 4, wherein the sheet is formed in a lattice shape. 6. The increase rate of the static friction coefficient of the cured sheet made of paperboard as compared with the paperboard is 9% or more as a numerical value of the static friction coefficient in the paper flow direction measured according to the “inclination method” in JIS P8147. The paperboard curing sheet according to any one of claims 1 to 5, which is provided. 7. The paperboard curing sheet according to claim 1, wherein the paperboard is water-resistant paperboard. 8. The paperboard has a rice basis weight of 680 to 2040 g /
The paperboard curing sheet according to any one of claims 1 to 7, wherein m ² , the water absorbency measured by the Cobb method water absorbency test is 100 g / m ² or less and the burst strength is 100 kPa or more on both front and rear surfaces. .