JPS6343518B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for producing a relatively thick and homogeneous fibrous layer that can be used for buildings, etc. The apparatus has a perforated wall on the peripheral surface and communicates the inside with a suction source. A part of the water-permeable papermaking belt that surrounds more than half of the outer surface of the rotary papermaking drum and runs in an endless manner is suspended, and at the same time, the papermaking belt runs diagonally upward in a section of the papermaking belt that recedes from the top of the papermaking drum in a tangential manner. Then, a suction box is provided on the lower surface thereof, and a part of the papermaking drum is immersed together with a papermaking belt along the outer surface thereof in a first tank of slurry-like raw material fibers to form a circular mesh type first papermaking section, A second tank for slurry-like raw material fibers is provided along the inclined running section of the papermaking belt to form a Fourdrinier-type second papermaking section, and a second tank for slurry-like raw material fiber is provided between the first papermaking section and the second papermaking section in the first papermaking section. A brush roll is provided in contact with the outer surface of the paper-formed layer to scrape off the rough parts of the paper-formed surface, and after the surface of the paper-formed layer formed in the first paper-making section is made smooth and dense, it is stacked on top of the paper-formed layer to form a second paper-formed layer. It is characterized by the fact that papermaking is carried out in the department.

Embodiments of the present invention will be described with reference to the drawings.

In the drawings, reference numeral 1 denotes a cylindrical rotary papermaking cylinder whose peripheral wall 2 is made of a perforated wall such as a wire mesh or punch board, and the inside is communicated with a suction source. The chamber is divided and communicated with the suction source at its center, and as will be described later, the small chambers other than the area where papermaking is performed are isolated from the suction source to prevent a drop in suction force due to wasteful suction and save suction power.

Reference numeral 4 denotes a papermaking belt constructed in the form of an endless conveyor made of an air-permeable and water-permeable material such as wire mesh or felt, and one end of which is placed along half the circumference of the outer surface of the papermaking drum 1, and the papermaking belt 4 is rotated at the same speed as the circumferential speed of rotation of the papermaking drum 1. The sheet-forming belt 4 is moved in a tangential manner from the upper part of the sheet-forming drum 1 and is run obliquely upward over a partial section 5, and a suction box 6 is provided on the lower surface of the sheet-forming belt 4.

The lower half of the papermaking belt 1 and the papermaking belt 4 along its outer surface is immersed in the first tank 7 of the slurry-like raw material fiber a to form the circular mesh type first papermaking part 8, and the papermaking belt 4 is tilted as described above. A second tank 9 of slurry-like raw material fiber a is provided along the running section 5 to form a Fourdrinier-type second paper-making section 10,
A predetermined amount of slurry-like raw material fiber a is constantly supplied to the first tank 7 from the supply port 11 during operation, and the raw material fiber a is constantly supplied to the second tank 9 from the supply port 12, and the surplus is overflowed. The slurry is taken out from the outlet 13, and a flexible piece 14a made of rubber or the like is attached to the inner end of the bottom plate 14 of the second tank 9 to bring it into contact with the papermaking surface to prevent the slurry from flowing out and to prevent the slurry from flowing out. The surface of the layer A ₁ to be paper-formed on A 4 is pressed to make the layer densely compacted, and a pressure roll 15 and a brush roll 16 are provided on the lower surface of the bottom plate 14, and the brush roll 16 is used to control the inside of the first tank 7. The rough portions on the surface of the layer A ₁ to be paper-formed are scraped off in the first paper-making section 8, and then the scraped surface is pressed by the pressure roll 15 and the flexible piece 14' to make it smooth and dense. I did it like that.

In the figure, 17 is a pressure force that presses the upper surface of the papermaking layer A formed on the papermaking belt 4 in front of the inclined running part 5 of the papermaking belt 4, compacting the papermaking layer densely, and pushing out the water contained in the papermaking layer. Reference numeral 18 indicates a water absorption box provided on the lower surface of the belt, and reference numeral 19 indicates a conveyor for discharging the papermaking layer A, which is connected to the front end of the papermaking belt 4.

Thus, in the above-mentioned apparatus, if the papermaking drum 1 and the papermaking belt 4 are driven at the same circumferential speed while feeding the slurry-like raw material fiber a into the first tank 7, the suction negative pressure inside the papermaking drum 1 will cause the circular net type In the first papermaking section 8, the papermaking drum 1
The slurry-like raw material fiber a is sucked through the peripheral porous wall 2 and the water-permeable papermaking belt 4, and the moisture is removed by suction through the papermaking layered drum 1, and is deposited on the papermaking belt 4 to a predetermined thickness according to the suction pressure. A fibrous paper layer A1 _{of 1} is obtained.

Next, the papermaking layer A ₁ transfers to the inclined Fourdrinier-type second papermaking section 10 as the papermaking zone 4 travels, and the second
A paper layer A ₂ having a predetermined thickness is further formed on top of the upper surface of the paper layer A ₁ by the suction pressure from the suction box 6 in the paper forming section 10 .
The final paper-formed layer _A1 is relatively thick, so the suction pressure acting on its surface is weak, and the surface layer is relatively rough and flexible.
When _A2 is made into paper, the soft layer is interposed in the middle, making it impossible to obtain a homogeneous and dense paper layer throughout the thickness. Therefore, as shown in the drawing, the first paper making section 8 and the second paper making section
A pressure regulating roll 15 and a brush roll 16 are provided above and below in the middle of the papermaking section 10, and the brush roll 16 first scrapes off the soft surface layer portion of the first papermaking layer _A1 , and then the pressure regulating roll 15 scrapes off the soft surface layer portion of the first papermaking layer A1. Immediately after that, in the second papermaking section 10, the first papermaking layer _A1 is superimposed on the surface layer in a wet state. A second paper layer A ₂ is formed, and both layers A ₁ A ₂ are polymerized to finally obtain the desired homogeneous, dense, thick paper layer A.

Note that the first paper forming layer A ₁ by the pressure regulating roll 15
Due to the smooth surface of the flexible piece 14a, the contact with the flexible piece 14a becomes tight, thereby ensuring that the papermaking raw material is prevented from flowing out.

In this way, at a position where the papermaking layer A rides on the papermaking belt 4 and moves forward from the second papermaking section 10, the papermaking layer A is pressed down by the pressing belt 17 running endlessly from the upper surface to squeeze out the moisture in the layer A. Water absorption box 18 on the bottom
After dewatering and precisely correcting the layer density of the paper-formed layer A by pressing with a belt 17, it is placed on a conveyor 19 and sent to the next process section such as drying treatment, etc. In actual operation. Finally, a paper layer A of 20 to 30 mm is obtained.

In this way, according to the present invention, after a part of the papermaking belt installed so as to run in an endless manner is placed along the half circumference of the outer surface of the rotary papermaking drum whose peripheral wall is composed of a porous wall,
A part of the papermaking belt that is removed from the papermaking drum is inclined diagonally upward, and a part of the papermaking drum is immersed together with the papermaking belt along its outer periphery in the first tank of slurry-like raw material fibers, thereby forming a circular net. A first paper-making section of the type is formed, and a suction box is provided on the lower surface of the inclined running section of the paper-making band, and a second tank for slurry raw material is provided along the outside of the inclined running section. A second Fourdrinier-type paper-forming section is formed continuously to the first paper-making section, and the second paper-forming section overlaps the surface of the first paper-forming layer of a predetermined thickness formed on the paper-forming strip in the first paper-making section, and further A second paper layer of a predetermined thickness is continuously formed, and the first paper layer is wetted without drying, and the surface thereof is smoothed and finely corrected by a brush roll. Since the second paper forming layer is continuously formed on top of the top surface by the gravity and suction of the slurry raw material in the second paper forming section, both layers are tightly and inseparably integrated, and an extremely thick paper layer can be efficiently obtained, and the paper forming zone and Since the papermaking drums that suspend this are both rotated at the same speed and in the same direction, they can be run smoothly and easily without creating any particular resistance between them, reducing power consumption, and the tension of the papermaking belt can be reduced. Because of this, it is weak and has a low degree of wear and has a long service life, which has the effect of obtaining a device suitable for producing uniform thick fiberboard.

[Brief explanation of drawings]

The drawings show an embodiment of the device of the present invention.
The figure is a side view of the whole, and FIG. 2 is a cutaway side view of the main part. DESCRIPTION OF SYMBOLS 1... Rotating papermaking drum, 2... Porous wall, 4... Papermaking belt, 5... Inclined running part, 6... Suction box, 7
...First tank, 8...Circle net type first paper making section, 9...Second tank, 10...Fourdrinier type second paper making section, A ₁ A ₂ ...First and second paper making layer, A ...Multi-layer papermaking layer.

Claims (1)

[Claims] 1. A part of a water-permeable papermaking belt that runs endlessly and surrounds more than half of the outer surface of a rotary papermaking drum whose peripheral surface is composed of a porous wall and whose inside is communicated with a suction source is suspended, and a cutting line is drawn from the top of the papermaking drum. A section of the paper-making belt that is withdrawn in a shape is run diagonally upward, and a suction box is installed on the lower surface of the paper-making belt, and a part of the paper-making drum is placed along the outer surface of the paper-making belt along with the paper-making belt in the first tank of slurry-like raw material fibers. The slurry-like raw material fibers are immersed in the slurry to form a first round-mesh-type paper-making section, and a second section of the slurry-like raw material fibers is immersed in
A tank is provided to form a Fourdrinier-type second papermaking section, and a tank is provided between the first papermaking section and the second papermaking section, in contact with the outer surface of the papermaking layer made in the first papermaking section, and scraping off the rough part of the papermaking surface. A first thick fiberboard manufacturing apparatus characterized in that a brush roll is provided to make the surface of a paper-formed layer smooth and dense in a paper-making section, and then the paper-formed layer is overlaid on the paper-formed layer and paper-formed in a second paper-making section. .