JPS6037941Y2 - impact resistant gypsum board - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a composition of a gypsum core, paper, and glass fibers for improving the impact resistance of gypsum board.

Conventionally, in order to improve the impact resistance of gypsum board, a method has been adopted in which glass fibers are mixed into the gypsum core of the gypsum board in the form of short fibers or long fibers, but the amount required to obtain the required impact resistance has been adopted. If a large amount of glass fiber is used, it is difficult to uniformly disperse the glass fiber in the gypsum core, and if a large amount of glass fiber is used, it becomes difficult to bond the board paper and the gypsum core, and the effect of improving impact resistance may be small. It was a drawback.

In general, the impact resistance of gypsum board is controlled by the strength of the paper and the adhesive strength between the paper and the gypsum core. Even if the strength of the gypsum core is improved, if the adhesion between the paper and the core is not sufficient, the impact resistance will deteriorate. No improvement is seen.

If you try to put a large amount of glass fiber into the gypsum core, the glass fiber will impair the fluidity of the gypsum slurry (the state before the gypsum core hardens) when forming the gypsum board, which will worsen the compatibility between the paper and the gypsum slurry. Even if the paper is rolled onto the slurry and brought into close contact, the reaction force of the large amount of glass fibers will cause the paper to be peeled off from the slurry layer again after rolling. (condition)), and it was not possible to obtain a gypsum board with uniform strength and high impact resistance.

The present invention eliminates these causes and provides a gypsum board structure in which the adhesion between the paper and the gypsum core is sufficient, and the impact resistance of the gypsum board is significantly improved by using a small amount of glass fiber. It is something to do.

The idea is that at least one of the front paper and back paper for the board can be used without the use of glass fiber, which inhibits the adhesion between the paper and the gypsum core in the conventional construction where a large amount of glass fiber is used in the gypsum slurry. It is characterized by having a glass fiber layer on top and a surface paper layer on top of that.

Here, the surface paper refers to the paper that is adhered to the outside of the glass fiber layer, and when the surface paper and the front or back paper are sufficiently adhered to the glass fiber layer and adhesive and become one,
The strength-enhancing effect of glass fibers is exerted, and as a result, the impact strength of the gypsum board is improved.

That is, in FIG. 1, the conventional gypsum board has a gypsum core part 1,
For example, as shown in FIG. 2, a glass fiber layer 4 is arranged on the plaster core 1, the front paper 2, the back paper 3, and the front paper 2, and the back paper 3. Further, it is covered with a surface paper 5, and the front paper 2, the glass fiber layer 4, and the surface paper 5 are sufficiently adhered with an adhesive such as glue to form a single body.

The structure of the impact-resistant gypsum board of the present invention is shown in Figure 3.
A glass fiber layer 4 may be disposed on the outside of a back paper 3 of a gypsum board consisting of a gypsum core 1, a front paper 2, and a back paper 3, and the outer side may be covered with a surface paper 5.

In the present invention, even if another paper is interposed between the back paper 3 and the glass fiber layer 4 in FIG. 3, it is considered as back paper in the present invention. shall be provided.

Furthermore, the structure of the present invention is as shown in Fig. 4, in which a glass fiber layer 4 is arranged on the entire surface of the gypsum board consisting of a gypsum core 1, a front paper 2, and a back paper 3, and the outer surface of the gypsum board is further covered with a surface paper 5. It is something.

Moreover, the structure may be applied to a gypsum board with sloped ends as shown in FIG.
The entire back paper 3 and a part of the front paper 2 are covered with a glass fiber layer and a surface paper.

In the present invention, a structure in which a glass fiber layer is arranged on the outside of at least one of the front paper and the back paper, and the outer side is further covered with a surface paper is, for example, explained in FIG. 2. After hardening, the gypsum core 1) is wrapped with a front paper 2 and a back paper 3 and shaped, that is, after a gypsum board is produced by a normal industrial manufacturing method, a glass fiber layer 4 is placed on the outside. It can be easily manufactured by bonding the surface paper 5 to the paper using an adhesive.

Furthermore, in order to achieve these configurations at once, for example, as shown in FIG.
The above slurry is wrapped and molded using a front paper 2 and a whole board paper which is made up of a back paper 3, a glass fiber layer 4 and a surface paper 5 as a back paper. In other words, instead of the backing paper used in the production of normal industrial gypsum board, paper with a glass fiber layer and surface paper bonded to the backing paper in advance is used. It may be made into gypsum board by using a method similar to that used for manufacturing gypsum board.

In this case, the back paper 3, the glass fiber layer 4 and the surface paper 5
may have a layered structure, and the glass fiber layer 4 may have a layered structure.
Even if at least one of the back paper 3 and the surface paper 5 is partially wedged and does not form a complete three-layer structure, as long as these three are integrated, the impact resistance that is the purpose of the present invention can be achieved. This will not be a hindrance to improvement.

The glass fibers used in the glass fiber layer in the present invention are preferably E-glass or S-glass glass fibers which are commonly used, and the shape thereof is preferably a long fiber glass fiber mat or a glass fiber cloth.

E-glass is a material with an alkali content of 0 according to JIS R3420 and a weight of % or less, and has excellent electrical insulation properties, and S-glass is a fiber made of fiber containing components other than SiO2, MgO, and AI203 of less than 1% by weight. Refers to materials with excellent tensile strength.

It is also possible to use chopped strands obtained by cutting these long fibers with a cutter.

With the impact-resistant gypsum board of the present invention, it is not necessary to mix a large amount of short fiber glass fibers into the gypsum slurry (which becomes the gypsum core after hardening). 1 part by weight of glass fiber may be used) The glass fiber in the gypsum slurry will not cause poor adhesion between the gypsum core (hardened gypsum slurry) and the front or back paper. ■The paper of the gypsum board is reinforced by the glass fiber layer, and the combination of these two effects can significantly improve the impact resistance of the gypsum board.

In addition, because the glass fibers are concentrated in the surface layer, the gypsum board of the present invention has impact resistance that is equal to or higher than that of glass fibers weighing 175 mm compared to the conventional structure in which glass fibers are mixed into the gypsum core. This creates a strong gypsum board.

As described above, the present invention has advantages in that a gypsum board with uniform strength and high impact resistance can be obtained by using a small amount of glass fiber without any manufacturing difficulties. The practical effects and value are extremely large.

This will be explained below using examples.

Example Gypsum board A specified in JIS A 6901-1975 (thickness 151rIIIt1 length 182 (hym, width 455mm), glass fiber cloth with an average weight of 209/rre and surface paper (basis weight 80g/rd') made of an emulsion type They were bonded and integrated with adhesive to obtain gypsum boards B of the present invention corresponding to FIGS. 2 to 5, respectively.

For the plasterboard B corresponding to each diagram, each light-weight steel stud (core-to-core or <455 mm
), a 2rrL square wall base was constructed by fixing the board with screws so that the surface paper side glued above was in contact with the stud in a direction perpendicular to the longitudinal direction of the board and the stud.

However, in the boards shown in Figures 4 and 5, the back paper side was the stud side.

From above the wall base formed by these gypsum boards B, gypsum boards A with a shape corresponding to each gypsum board B are further fixed with screws so that the longitudinal direction thereof is parallel to that of the studs, and the BXA two-layer A wall made of plasterboard was obtained.

For each of these walls, JIS A 1304-
According to 1975, after heating the gypsum board for 3 inches from the A side, place the gypsum board on the floor with the A side facing up, 1 m above the upper surface of the waist wall.
When the impact resistance of the wall was examined by dropping a weight of 10 to 9 from the height of , the walls corresponding to both figures passed the test.

On the other hand, instead of the gypsum board B in the above, a gypsum board C made by gluing only the glass fiber cloth used above with the adhesive used above to the gypsum board A corresponding to each figure was used, and the walls were similarly constructed. When a similar impact test was conducted with the body in place, two gypsum boards A and C, both of which had two layers, were tested.
was destroyed and the weight penetrated both, resulting in a failure.

[Brief explanation of drawings]

FIG. 1 shows a cross-sectional view of a conventional gypsum board. FIG. 2 is a sectional view showing one embodiment of the present invention, showing a state in which a glass fiber layer is arranged on the front paper of a gypsum board, and the outside thereof is further covered with a surface paper. FIG. 3 is a cross-sectional view showing one embodiment of the present invention, in which a glass fiber layer is arranged on the back paper of a gypsum board, and the outside thereof is further covered with a surface paper. FIG. 4 is a cross-sectional view showing one embodiment of the present invention, in which a glass fiber layer is placed over the entire front and back paper of a gypsum board, and the entire outside thereof is further covered with a surface paper. FIG. 5 is a cross-sectional view showing one embodiment of the present invention, in which a glass fiber layer is arranged on a part of the back paper and front paper of a gypsum board, and the outside thereof is further covered with a surface paper.

Claims (1)

[Scope of utility model registration request] A glass fiber layer is arranged on the outside of at least one of the front paper and the back paper of the gypsum board, and the outside of the glass fiber layer is further covered with a surface paper, and at least one of the front paper and the back paper is made of glass. An impact-resistant gypsum board characterized in that a fiber layer and a surface paper are sufficiently bonded with an adhesive to form a single body.