JP2001121522A - Press molding machine for hydraulic mineral molded body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a press molding machine for a hydraulic mineral molded body capable of manufacturing a product having a good surface appearance, and a quality of an edge part free from defects. SOLUTION: In a press molding machine of a hydraulic mineral molded body wherein a surface water content squeezed from a premolded body by pressing is dehydrated by a dehydrating means provided on a mold face of one side mold of top and bottom molds while the premolded body provided by premolding a hydraulic mineral molding material, is press-molded between the top and bottom molds, a water permeable material layer is provided by affixing along a mold surface of the other mold.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for press-forming a hydraulic inorganic molded article.

[0002]

2. Description of the Related Art Conventionally, as a method for producing a plate-like building material using a hydraulic inorganic molding material, for example, there is a papermaking method. In this papermaking method, as disclosed in Japanese Patent Application Laid-Open No. Hei 6-320519, after a cement slurry is supplied onto a permeable sheet and dewatered under reduced pressure through the permeable sheet, a green sheet is continuously formed. Then, this green plate is cut into a predetermined size to obtain a preform.

[0003] Then, the preformed body is further dewatered and pressed by a press device to obtain a formed body, which is cured and hardened, and coated as necessary to obtain products such as building materials. I have.

In the conventional press forming apparatus, a dewatering hole is provided in the lower mold surface, and the excess water in the pre-molded body pressed by the upper and lower dies is dewatered through the dewatering hole. Press molding is performed between the upper and lower molds. However, since there is no dehydration hole on the upper mold side, there is no way for excess water leaking out to the upper mold surface side of the pre-formed body by pressing, and there is no passage between the upper mold surface and the molded body. The appearance of the product surface is degraded, such as accumulation, a concave portion being formed on the surface of the molded body, or a water drainage path, or a part of the molding material is ejected with water from the end surface opened at the time of pressing, and the quality of the end portion is released. There is a problem that said that it gets worse.

On the other hand, if the dewatering holes are provided on both the upper and lower mold surfaces, the above-mentioned problems such as the accumulation of excess water and the ejection from the end can be solved, but they hit the surface of the product. If a dehydration hole is provided in the upper mold surface and dehydration is performed from this dehydration hole, traces of the dehydration hole will remain on the surface of the product, which may cause a problem in the appearance of the product.

[0006]

SUMMARY OF THE INVENTION In view of the foregoing, the present invention has been made in view of the above circumstances, and has been described in view of the fact that a hydraulic inorganic molded article having a good surface appearance and having no poor end quality can be produced. It is intended to provide a device.

[0007]

SUMMARY OF THE INVENTION In order to achieve such an object, a press forming apparatus for a hydraulic inorganic molded article according to the present invention is capable of vertically preforming a hydraulic inorganic molding material. Of a hydraulic inorganic material formed such that excess water squeezed from the preform by a press is dewatered by dehydration means provided on the mold surface of one of the upper and lower dies while press-forming between the dies. In the press molding apparatus, a configuration was adopted in which a water-permeable material layer was provided along the mold surface of the other mold.

Further, in the press molding apparatus of the present invention,
It is preferable that the water-permeable material layer has an uneven pattern on the molded body side.

In the present invention, the hydraulic inorganic molding material is usually used as a building material containing cement and water as main components and, if necessary, reinforcing fibers, pigments, aggregates, lightweight aggregates and the like. Known ones can be used.
As the water-permeable material forming the water-permeable material layer, a material that can transmit only water and has good releasability from a hydraulic inorganic molding material is preferable. For example, it is made of nylon (polyamide) having water permeability. And a sheet-like material such as a mesh-like woven fabric made of polypropylene or the like.

When a mesh-shaped woven fabric is used as the water-permeable material, the yarn diameter is preferably 0.5 mm or more and 2 mm or less,
The number of stitches may be different in the vertical and horizontal directions,
10 or more per inch in both vertical and horizontal directions 25
The following is preferred. That is, if the yarn diameter is less than 0.5 mm, the pattern of the woven fabric cannot be transferred to the surface of the molded body. On the other hand, if it is 2 mm or more, the unevenness of the uneven pattern transferred to the surface of the molded product is large, and the appearance as a product may be deteriorated.

On the other hand, if the mesh is too fine, there is a problem in water permeability, and the pattern of the fabric cannot be transferred to the surface of the molded article. If the mesh is too coarse, the unevenness of the uneven pattern transferred to the surface of the molded article is large, and the appearance as a product may be deteriorated, or the releasability may be deteriorated. The weaving method of the woven fabric is not particularly limited. However, by using various weaving methods such as plain weaving and twill weaving, or by using warp yarns and weft yarns having different yarn diameters, a product surface having complicated decoration can be obtained. The yarn may be a twine or a monofilament.

The material of the upper mold and the lower mold is not particularly limited, and examples thereof include metals such as stainless steel and aluminum, and fiber-reinforced plastics.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below.
This will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of a press forming apparatus for a hydraulic inorganic molded article according to the present invention (hereinafter, simply referred to as “press forming apparatus”).

As shown in FIG. 1, this press forming apparatus 1
The upper mold 2, the lower mold 3, the upper mold water-permeable sheet 4 to be a water-permeable material layer, the lower mold water-permeable sheet 5, and the wire mesh 6.
And In the lower mold 3, the mold surface 31 has a substantially corrugated cross section, and a number of dehydration holes 32 are formed in the mold surface 31. These dehydration holes 32 are provided inside the lower die 3. It is connected to a dehydrating device (not shown) via a dehydrating path 33.

The wire mesh 6 is provided along the mold surface 31 of the lower mold 3, and the lower mold water-permeable sheet 4 is provided along the wire mesh 6.

The upper mold 2 has a mirror-shaped mold surface 21 having a cross-sectional waveform that engages with the mold surface 31 of the lower mold 3. As shown in FIG. 2, the upper mold water-permeable sheet 4 has a yarn diameter of 0.5 mm to 2 mm.
The mesh is formed of a plain-woven nylon fabric having a mesh of 10 to 25 mm and is not shown, but is attached to the mold surface 21 of the upper mold 2 by being fixed to the upper mold 2 by bolts at the peripheral edge thereof. Thus, a water-permeable material layer is formed.

The press forming apparatus 1 is configured as described above. First, a raw sheet (not shown) having a corrugated cross section continuously formed by a papermaking method is obtained by cutting into a predetermined size. As shown in FIG. 1, the preform 8 is received on the mold surface 31 of the lower mold 3 via the water-permeable sheet 4 for the lower mold and the wire mesh 6. Next, as shown in FIG. 3, the upper mold 2 is overlapped with the lower mold 3, and the preform 8 is press-formed between the upper and lower molds 2 and 3, and water is squeezed by a press through the dewatering holes 32. The excess water of the preformed body 8 is dewatered and removed to obtain a hydraulic inorganic formed body 7 having a predetermined water content.

In addition, in this press molding apparatus 1, since the water permeable sheet 5 is provided as a water permeable material layer on the mold surface 21 of the upper mold 2, it oozes out to the mold surface 21 side of the upper mold 2 by pressing. The surplus moisture permeates into the water-permeable sheet 5 and is discharged from the side surface of the press forming apparatus 1. Therefore, not only the excess moisture oozed to the lower mold 3 side but also the excess moisture oozed to the upper mold 2 side does not remain on the surface of the molded body 7, and a water drainage path is formed on the surface of the molded body 7. In addition, since excess water is discharged from the side surface of the press forming apparatus 1 via the water permeable sheet 4, it is not necessarily said that the molding material is ejected from the end of the molded body 7 together with water.

The water permeable sheet 5 has a yarn diameter of 0.5 mm or more.
Since it is formed of a plain woven nylon fabric having a stitch length of 2 to 25 mm per inch in both the vertical and horizontal directions, the woven pattern of the water-permeable sheet 5 is applied to the surface of the molded body during pressing. Can be transcribed. That is, if the molded body 7 thus obtained is cured and cured, a product 9 having a cross-sectional waveform as shown in FIG. 4 and having a high surface design and an excellent appearance can be produced.

The press forming apparatus according to the present invention is not limited to the above embodiment. For example, in the above-described embodiment, the water-permeable material layer is formed of a removable water-permeable sheet on the upper mold, but may be provided integrally with the upper mold. Further, in the above-described embodiment, the molded body has a corrugated plate shape, but may have a flat plate shape, or may have a stepped or pulsed wave-shaped unevenness on the surface side.

[0021]

Embodiments of the present invention will be described below in more detail.

Example 1 Nylon warp yarns of 2.0 mm and weft yarns of 0.5 mm were used as the water-permeable sheet for the upper die.
FIG. 3 shows a press forming apparatus as shown in FIG. 1 using a twill woven cloth (porosity: 11%) in which the number of stitches per inch is 10 and the number of stitches per inch in the horizontal direction is 25. When such a corrugated molded article was manufactured, since a water-permeable material layer was formed along with the mold surface of the upper mold due to the addition of a water-permeable sheet, excess moisture that had permeated to the upper mold side caused this water-permeable material The molded product was discharged to the side of the pressing device through the layer, and a water-exiting path and the like were not left on the surface of the body, and a molded article having good appearance without defective portions at the ends was obtained. Further, the texture of the twill woven fabric used as the water-permeable sheet was transferred to the surface of the molded body, and the design was excellent.

(Comparative Example 1) A molded product was obtained in the same manner as in Example 1 except that a polyvinyl chloride sheet was provided along the mold surface of the upper mold instead of the water-permeable sheet. Excess moisture oozing to the side is ejected from the side of the press molding device together with the hydraulic inorganic molding material forming the end of the molded body,
Poor filling of the material occurred at the end face of the molded body.

[0024]

The press forming apparatus for a hydraulic inorganic molded article according to the present invention is constructed as described above, so that it is possible to produce a product having a good surface appearance and having no defective end portions. it can. According to the second aspect of the present invention, it is possible to obtain a product having a highly designable surface shape in which the shape of the water-permeable material layer is transferred onto the surface of the molded body simultaneously with the molding.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a press forming apparatus for a hydraulic inorganic formed body according to the present invention, showing a state before pressing of the preformed body.

FIG. 2 is an enlarged plan view of a water-permeable sheet of the press forming apparatus of FIG.

FIG. 3 is a side view illustrating a pressed state of the press forming apparatus of FIG. 1;

FIG. 4 is a perspective view of a product obtained by curing and curing a molded body molded by the press molding apparatus of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Press molding apparatus 2 Upper mold 21 Mold surface (upper mold) 3 Lower mold 31 Mold surface (lower mold) 32 Dehydration hole (dehydration means) 33 Dehydration path (dehydration means) 5 Water-permeable sheet (water-permeable material layer) 7 Water Hard inorganic material 8 Preform

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4G053 AA14 AA15 BB09 BB13 BF01 CA04 CA21 EA03 EA21 EA26 EB05 4G054 AA01 AB03 AB06 AC04 AC06 BA02 BA24 BA55 BA62 4G055 AA01 AB01 AC01 AC02 BA44

Claims (2)

[Claims] 1. A preformed body obtained by preforming a hydraulic inorganic molding material is press-formed between an upper mold and a lower mold while being pressed by a dewatering means provided on a mold surface of one of the upper and lower molds. In a press forming apparatus for a hydraulic inorganic material formed to dewater excess water squeezed from water, a water-permeable material layer is provided along the mold surface of the other mold. Press forming equipment for hydraulic inorganic molded products. 2. The press-molding apparatus for a hydraulic inorganic molded article according to claim 1, wherein the water-permeable material layer has an uneven pattern on the molded article side.