JPH0475803B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method for applying embossed patterns to extrusion molded products, and in particular to ceramic extrusion molded products made from inorganic materials such as asbestos cement and fiber-reinforced calcium silicate. This invention relates to an embossed patterning method.

<Prior art> Extrusion molded products made from inorganic materials such as those described above can be used for construction components constructed in buildings such as houses and stores, such as exterior wall materials, gables, fascias, curtain boards, picture frames, caps, etc. It is also widely used as a baseboard. This type of extrusion molded product allows for continuous extrusion of hollow or irregularly shaped objects that cannot be produced using other manufacturing methods, and can easily be extruded into a wide variety of shapes by simply replacing the soybean in the extruder. For example, when asbestos cement is used, a mixture of asbestos, cement, etc. is plasticized by adding water, etc., and an extrusion molding mixture is extruded using an extrusion molding machine. It is made by curing the molded product in an autoclave and solidifying it.

<Problems to be Solved by the Invention> Incidentally, as building designs have become increasingly sophisticated and diversified in recent years, and simple, flat appearances are declining, the surface designs of these building components are also becoming more three-dimensional. There is an increasing social need for geometric embossed patterns and naturally occurring amorphous embossed patterns.
When applying this type of embossed pattern, generally, the smooth surface of an unsolidified molded product extruded in the extrusion direction is immediately after extrusion molded, and an embossed pattern is created with a desired uneven pattern on the surface facing the molded product. A method is used in which the molded product is pressed and clamped with a mounting jig perpendicular to the extrusion direction using a pressure that does not deform the molded product.
However, even in the uncured state immediately after molding, the extrusion molded product has poor flexibility and is difficult to physically deform plastically. It is extremely difficult to clearly apply an exact embossed pattern to the surface of a molded product. In particular, when trying to create a deep, sharp embossed pattern, sharp corners on the jig cannot be accurately transferred. There is a problem in that only rounded and indistinct patterns can be formed.
This tendency is particularly strong in the case of extrusion molded products made from materials mixed with pulp or the like, since the fibers present in the surface layer of the molded product make plastic deformation more difficult.

<Means for Solving the Problems> The manufacturing method of the present invention, which was developed in view of the above-mentioned problems, includes a large number of particles on the surface layer of an extruded product obtained by extruding a kneaded material for extrusion molding using an extrusion molding machine. The gist of this method is to form a large number of needle holes with a hole-drilling jig on which needle-like protrusions are formed, and then pressurize the surface of the extruded product with an embossing patterning jig.

Examples of the above-mentioned drilling jigs include:
It is also possible to form a large number of needle-like protrusions on the surface of a flat substrate, or to form a large number of needle-like protrusions on the outer peripheral surface of a roll-like substrate, but as described later, it is suitable for pressure molding of an embossed pattern. From the viewpoint of efficiently imparting sufficient plasticity to the surface layer of the extruded product, a hole-drilling jig made of a roll-shaped substrate is preferable. When a hole-drilling jig made of a flat substrate is used, for example, this jig is sequentially pressed or pressurized onto the surface of the molded product in a direction perpendicular to the extrusion direction, or a jig made of a roll-shaped substrate is used. In this case, for example, a method may be used in which the surface of the molded product is continuously pressed or pressed by rotating the jig in the same direction as the extrusion direction of the molded product.

In addition, the needle-like protrusions formed on the hole-drilling jig are not necessarily limited to conical shapes.
The depth of the needle hole formed in the surface layer of the molded product after pressing the extrusion molded product with a jig or pressurizing the molded product is approximately the same depth or slightly deeper than the depth of the embossed pattern that will be added to the same surface layer in the next process. For example, it may be a needle-like part formed integrally with the base of the jig, or it may be a needle-like member fixed to the jig surface or embedded in the jig surface. The size and gap of the needle-like protrusions may be appropriately determined depending on the properties of the extruded product and the area and degree of the unevenness of the embossed pattern.

Furthermore, the part of the extrusion molded product to be pretreated with the hole-drilling jig may be the surface part of the molded product where the embossed pattern will be applied in the next process, or the surface layer part and the periphery of the surface part, and is not necessarily the entire surface of the extrusion molded product. It goes without saying that no pretreatment is required.

<Function> As in the above method, by forming a large number of needle holes in the surface layer of an unsolidified extruded product immediately after molding using a hole punching jig in which a large number of needle-like protrusions are formed, the surface layer is loosened. This softens the molded product, giving the surface layer of the molded product a plasticity suitable for forming a clear embossed pattern under pressure in the next step.

In particular, if a hole-drilling jig made of a roll-shaped substrate is used, the needle holes formed on the surface layer of the extruded product will not be simply needle-shaped, but will move in the direction of the axis rotation as the jig rotates. Since it has an elongated and substantially V-shaped cross section, plasticity can be imparted to the surface layer of the extruded product very effectively and efficiently.

<Example> Examples will be described below with reference to the accompanying drawings.

14mm thick and 225mm wide, used for building exterior walls.
In order to create a geometric pattern on the surface of the fiber-reinforced calcium silicate extrusion molded exterior wall narrow board for armoring, a kneaded material for extrusion molding having a conventionally known composition was extruded using a known method using an extrusion molding machine. . after that,
As shown in FIG. 3A, on the outer circumferential surface 2a of the drum-shaped base 2, a base having a diameter of 0.5 to 2 mm and a length of 2 to 4 mm is provided.
Using a drilling jig 4 in which a large number of metal needle-like protrusions 3 of 3 mm in diameter are arranged in a lattice or staggered manner at intervals of 3 to 6 mm, this is extruded as shown in Fig. 1 or 2A. The surface layer 1b of the extrusion molded product 1 is pressed or clamped with a pressure of 1 to 5 kg/cm ^{2 by rotating the shaft in the extrusion/conveying direction of the product 1 and pressing or clamping the unsolidified surface 1a of the extrusion molded product 1 immediately after molding with a pressure of 1 to 5 kg/cm 2} . A large number of needle holes 1c were bored in a grid pattern or a staggered pattern. At this time, needle hole 1c
is not a mere needle-shaped hole, but has a substantially V-shaped cross section elongated in the direction of rotation of the axis of the drilling jig 4 as shown. Next, the emboss patterning jig 5, which has a pattern surface 5a consisting of an uneven geometric emboss pattern with a depth of 2 mm facing the surface of the molded product, is placed in the first
As shown in the figure or Figure 2B, when the surface of the extruded product was pressed at a pressure of 3 to 15 kg/ ^cm2 , a sharp and deep shape that conformed to the pattern surface was formed as shown in Figures 2C and D. It was transferred onto the surface 1a of the extrusion molded product 1.

On the other hand, using a similar extrusion molded product, on its surface,
Immediately after extrusion, a similar emboss pattern forming jig 5 was pressed at a pressure of 5 to 20 kg/cm ² without performing the hole drilling process using the hole forming jig 4 as described above, and the emboss pattern was formed. The straight line portion of the geometric pattern on the pattern surface 5a of the jig 5 could not form sharp corners according to the shape of the jig, and only an embossed pattern with vague roundness could be formed. Therefore, I replaced the embossed patterning jig with a stucco-like or woodgrain-like jig and tried pressing the same jig immediately after extrusion molding, but I could only form an indistinct embossed pattern in the same way.

The above is an example in which a hole-drilling jig in which a needle-like protrusion 3 is provided on the outer peripheral surface 2a of a drum-shaped base body 2 is used.
As shown in FIG. Needless to say, a similar needle hole may be made in the hole.

<Effects of the Invention> According to the manufacturing method of the present invention configured as described above, an embossed pattern is pressure-formed on the surface of the molded product in the pre-process of pressurizing the surface of the extrusion molded product with an embossed pattern forming jig. Since suitable plasticity is imparted, it is possible to easily form a desired uneven pattern on the surface of an extrusion molded product in a clear and sharp manner, which has the effect of improving the quality of the molded product.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the process of an embodiment of this invention, Figures 2 A to D are explanatory diagrams showing the respective states of the extruded product in each process, and Figures 3 A and B are each used in the present invention. FIG. 2 is a perspective view showing an example of a drilling jig. 1... Extrusion molded product, 2... Drum-shaped substrate, 3...
... Needle-like projection, 4... Hole-making jig, 5... Emboss pattern forming jig, 6... Flat substrate, 1a... Surface, 1b... Surface layer portion, 1c... Needle hole.

Claims (1)

[Scope of Claims] 1. A large number of needle holes are formed in the surface layer of an extruded product obtained by extruding a kneaded material for extrusion molding using an extrusion molding machine using a hole punching jig in which a large number of needle-like protrusions are formed. 1. A method for applying an emboss pattern to an extrusion molded product, which comprises applying pressure to the surface of the extrusion molded product using an emboss design jig. 2. The method according to claim 1, characterized in that a drilling jig having a large number of needle-like protrusions formed on the surface of a flat substrate is used. 3. The method according to claim 1, characterized in that a drilling jig is used in which a large number of needle-like protrusions are formed on the outer peripheral surface of a roll-shaped substrate.