JPS5820785A - Correction of mineral fiber board warp - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for correcting warpage of a mineral fiberboard made of mineral fibers such as rock wool.

The conventional manufacturing method for mineral fiberboard is as shown in the process shown in FIG. 1, in which a water-based emulsion paint is coated on the surface of the mineral fiber substrate (a) with a roll coater (b) for 20 to 30 coats.

After coating, a heated uneven press (c) is used to create a suppressed pattern, then a dryer (b) is used to dry the product, and an end face processing machine (e) is used to perform actual processing to create the product (f). was common.

However, when using the uneven press (c) K, when creating an uneven pattern, a water-based emulsion paint is applied during the coating process, so when it dries, the resin content in the paint shrinks, causing uneven warping. There was a problem. For this reason, due to the concave warpage formed on the product, it takes time to insert the actual processed parts provided at the side edges between the 111m mineral plates, and in the worst case, due to the warp, it is difficult to insert nails after construction. It also has the disadvantage that it does not look like a single piece because it tends to come off, and gaps and steps are likely to occur at the joints after construction.

The present invention has been made in view of the above-mentioned circumstances, and its object is to provide a method for correcting warpage of mineral fiberboard, which eliminates the above-mentioned drawbacks.

A stone according to an embodiment of the present invention will be explained below based on FIG. 2.

An undercoat 2, which is a mixed mixture of water and a thickener, is applied to the surface of a mineral fiber substrate 10 made of rock wool or the like using a roll coater 3. At this time, the thickener used is a mixture of carboxymethyl cellulose and snow algin, or one selected from carboxymethyl cellulose and snow algin. Then apply primer 2 using a roll coater.
After the coating is applied by Step 3, it is pressed and patterned using a concavo-convex press 4IC having an upper die heated to 250° to 350°C. After that, the mineral fiber substrate 1 is box-shaped dried 51.
15 to obtain a mineral fiberboard.

At this time, there is a chain conveyor 6 inside the box dryer 6.
A plurality of plate bodies 7 having convex curvature are attached to this chain conveyor 6 with gaps between them, and a pressed mineral fiber substrate l is placed on this plate body 7. The warp is corrected by the formed convex warp.

The relationship between the smoothness of the plate 7 having a convex curvature fixed to the chain conveyor 6 of this box-type dryer 5 and the coated material will be explained in detail.

As shown in FIG. 3, the smoothness S of the plate 7 having a convex curvature is expressed by the distance of the highest convex portion from the horizontal line. In addition, the test piece of mineral fiberboard is 474 cm x 24 long.
The test was carried out at 25 cm x 15 cm in thickness, and the warp W in the width direction was made to be a normal warp as shown in FIG.

Furthermore, when we measured the warpage of the mineral fiberboard by varying the smoothness of the coated material and the conveyor as shown below, we found that
The test results shown in the figure were obtained.

As is clear from the test results in Section 1, when a base coat containing a cross-mixing of water and a thickener is applied to the surface of a mineral fiber substrate instead of the conventional water-based emulsion paint, ~
This primer prevents the surface from shrinking even when it is pressed into shape using a concave-convex press heated to 350°C, reducing warpage and softening the mineral fiber substrate, which prevents it from sticking to the chain conveyor of a box dryer. In this test, when the smoothness of the conveyor was 5-6-, the amount of undercoat applied to the surface of the mineral fiber substrate was approximately 15 P/1) GFt. The width warpage is 0.

For this reason, due to the concave warpage formed in the product, it takes time to fit the actual processed parts provided at the side edges between the mineral fiber boards, and in the worst case, due to the warp, nail will not separate or stick, and
There are no gaps or steps at the joints after construction, so it looks like a single piece.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the main part of TIl showing the conventional manufacturing method of mineral fiberboard, Fig. 2 is a perspective view of the main part of the process showing the method of correcting warpage of mineral fiberboard of the present invention, and Fig. 3 is FIG. 4 is a perspective view showing a test bar, and FIG. 5 shows a mineral fiberboard plate body with convex curvature to be fixed to a chain conveyor of a box-type dryer according to the present invention. FIG. 3 is a characteristic diagram showing a warpage relationship. DESCRIPTION OF SYMBOLS 1... Mineral fiber substrate, 2... Primer, 3... Roll coater 14... Concave and convex press, 5... Box dryer, 6... Chain conveyor %7... Plate body . Patent applicant Matsushita Electric Works Co., Ltd. Representative patent attorney Toshimaru Takemoto (and 2 others)

Claims (2)

[Claims] (1) Mineral #! After applying an undercoat mixture of water and a thickener to the surface of the fiber substrate, compression molding is performed using an uneven press heated to 250 to 350°C, and then a drying conveyor is used to fix the plate having convex warpage. A method for correcting warpage of a mineral fiber board, comprising correcting warpage of a mineral fiber board. (2) The mineral fiberboard according to claim (l), characterized in that a mixture of carboxymethyl cellulose and snow algin or a type far removed from carboxymethyl cellulose and snow algin is used as the thickener. How to correct warpage.