JPS591566B2 - Surface patterning device for extruded inorganic composition material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for extruding inorganic boards, such as cement boards.

In conventional extrusion molding of cement boards, the extrusion pressure must be set to a fairly high level to make the molded product high in density and the strength of the molded product increased (by significantly reducing the moisture content of the cement mixture relative to the cement). There is.

However, increasing the extrusion pressure in this way increases the dehydration phenomenon during extrusion, resulting in a decrease in the strength of the final finished product.

On the other hand, by increasing the moisture content of the cement mixture and lowering the extrusion pressure, the above dehydration phenomenon can be resolved, but the molded product immediately after extrusion becomes too soft, and the extruded molded product becomes weak during the drawing process. There were disadvantages such as breakage.

Therefore, when patterning is applied to a molded product immediately after extrusion using a roll with a surface pattern, the pressure applied by the roll cannot be increased because the extrusion molded product is too soft. The drawback was that it was difficult to create beautiful patterns on the surface.

An object of the present invention is to provide an extrusion molding apparatus capable of forming beautiful patterns on the surface of an inorganic plate while eliminating the above-mentioned drawbacks.

For the above purpose, the surface patterning device for an extruded inorganic composition material of the present invention is provided such that, on the downstream side in the extrusion direction of the extrusion path of the die, the extrusion end of the die upper body is upstream in the extrusion direction than the extrusion end of the die lower body. A sheet guide roll is rotatably provided in a portion of the upper body opposite to the extrusion end surface so that its axis of rotation is parallel to the surface of the extruded material and perpendicular to the extrusion direction, and the installation height of the roll is The width is set within a range that allows pressing the uneven patterned sheet onto the surface of the extruded material, and the extrusion direction position of the roll is such that the roll rotation center line is directly above the extrusion end of the die lower body or upstream from it in the extrusion direction. The gist is that the belt is located on the side, and that a gap is left between the circumferential surface of the roll and the end surface of the upper body, through which the belt can pass.

An embodiment of the present invention will be described below based on the drawings.
Prior to that, the entire patterning method will be briefly explained.

In FIG. 1, 1 is an extruder, and 2 is a die of the extruder.

A sheet introduction port 2a is provided at the upper part of the die 2, and a freely rotatable sheet guide roll 3 is provided in the sheet introduction port 2a.
0 is set.

3 is a belt conveyor, 4 is a sheet take-up roll, 5 is a sheet delivery roll, and 6 is a sheet peeling roll.

To carry out the extrusion patterning operation, a sheet S having an uneven pattern a on one side is inserted into the lower surface of the guide roll 30 through the sheet introduction port 2a of the die 2, as shown in FIG.

In this case, the sheet S is inserted so that its uneven pattern surface a faces the surface of the extruded material.

After inserting the sheet S into the die 1, the water-containing cement mixture B is extruded into a plate shape from the die 2 of the extruder 1, and the plate-shaped molded product P is received by a belt conveyor 3 and transferred on the conveyor 3. attitude(.

The sheet S is fed out from a sheet feeding roll 5 as the cement mixture is extruded, and is bitten into the die 2 while being pressurized by a guide roll 30.

Inside the die 2, the cement mixture B and the sheet S are moved together, and during this time, the uneven pattern surface of the sheet S is pressed onto the cement mixture B. A plate-like body P of the mixture is extruded.

The beet-adhered cement molded body M on the belt conveyor 3 is
When passing through the sheet peeling roll 6, the sheet S on the surface thereof is pulled by the sheet take-up roll 40 and peeled off from the molded body M.

After the sheet has been peeled off, the surface of the cement molded body P has an uneven pattern that is the reverse of the uneven pattern of the sheet.

Here, the die 2 is an upper body 2 as shown in the second figure.
1. Consists of a lower body 22, a side body (path shown), and a hollow pin 23, surrounded by a variable cross-section introduction path 24 and a constant cross-section extrusion path 25 in order from upstream to downstream in the extrusion direction.
is configured.

Therefore, the extruded end of the upper body 21 is connected to the lower body 2.
It is set back by a distance t to the upstream side in the extrusion direction from the extrusion end of No. 2, and its end surface 21a is directed upward in the extrusion direction (it is an inclined surface and serves as a guide surface for the sheet S).

Here, if the distance t is shorter than the land length of the hollow pin 230, backflow of the extruded material can be reliably prevented.

A sheet guide roll 30 is supported between the side bodies at a portion facing the extrusion end surface of the upper body 21 and is freely rotatable.

Therefore, the installation height H of the roll 30 is such that the lower end of the roll circumferential surface is higher than the virtual extension surface of the upper surface of the die extrusion path 25 by an amount equivalent to or less than the thickness of the sheet S. determined.

Further, the installation position of the roll 30 in the horizontal extrusion direction is determined such that the rotation center line of the roll 300 is within the virtual vertical extension of the extrusion end surface of the lower main body 22 or on the upstream side in the extrusion direction.

In this state, a gap is left between the circumferential surface of the roll 300 and the guide surface 21a of the die upper body, through which the sheet S can pass.

Next, another embodiment of the seat movable guide device will be described based on FIG. 3.

In this example, two first . Second guide roll 4L 4
2 are arranged in parallel with a gap in the extrusion direction.

A regulating plate 43 that prevents the sheet from floating up between both rolls is provided so as to be movable up and down.

In addition, 44C covers the roll 4L 42 from above,
Moreover, it is a cover for installing the regulation plate 43.

The installation height of the roll 4L 42 is the same as in the previous embodiment.

Further, the position in the extrusion direction of the 10th rule 41 is arranged such that there is a gap between it and the upper body guide surface 21a through which the sheet S passes, and the position in the extrusion direction of the 20th rule 42 is located at the lower part as described above. It is located within the virtual vertical extension plane of the extrusion end surface of the main body 22 or upstream in the extrusion direction.

Since the present invention has the above-described structure, when patterning is applied, there is no problem of roll surface pressure unlike the conventional patterning after extrusion, which involves applying the pattern with rolls, and therefore, the cement mixture has a high water content. (Furthermore, it is possible to use a product with a lower pressing force than in the past, and even if the extrudate becomes extremely flexible, it is reinforced by attaching the sheet, so breakage of the extrudate can be reliably avoided.

In addition, since a guide roll is used, the extrusion resistance of the sheet is small, and the sheet can be easily and reliably inserted into the cement mixture, and there is no harmful elongation or deformation of the sheet. Since an appropriate pressing force is applied to the molded body, a beautiful pattern can be formed on the surface of the inorganic composition.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an extrusion molding mode showing an embodiment of the present invention;
FIG. 2 is an enlarged longitudinal sectional view of the main part, and FIG. 3 is an enlarged longitudinal sectional view of the main part of another embodiment. 1...Extruder, 2...Dice, 21...
... Upper body, 22... Lower body, 2a.
... Sheet introduction port, 21a ... Inclined end surface, 24 ... Hollow pin, 25 ... Variable cross section introduction path, 26 ... Constant cross section Introduction route, 3...
Belt conveyor, 30... Sheet guide roll,
S... Sheet, a... Uneven pattern, P.
...Extruded plate-shaped body.

Claims (1)

[Claims] 1 On the downstream side in the extrusion direction of the extrusion path of the die, the extrusion end of the die upper body retreats further upstream in the extrusion direction than the extrusion end of the die lower body, and the sheet guide roll is placed in a portion opposite to the extrusion end surface of the upper body. The roll is rotatably provided so that the axis of rotation is parallel to the surface of the extruded material and perpendicular to the extrusion direction, and the installation height of the roll is set within a range where the uneven pattern on the surface of the extruded material can press the sheet, and , the position of the roll in the extrusion direction is such that the roll rotation center line is located directly above the extrusion end of the die lower body or upstream of it in the extrusion direction, and the circumferential surface of the roll and the end face of the upper body A surface patterning device for an extruded inorganic composition material, characterized in that a gap is left between the sheets through which the sheet can pass.