JPH01213490A - Pulper - Google Patents

Abstract

PURPOSE:To efficiently dissociate waste paper and separate into fiber and nonfibrous material, by providing strainers having different hole diameters between outer and inner periphery regions under a rotor set in a bottom part of a tank. CONSTITUTION:In a pulper in which a rotor is set at a center of a bottom part of a dissociation tank and strainers 3 and 5 are provided on the bottom face under vanes 11-14 of said rotor, the strainers 3 and 5 are divided into inner periphery region 5 and outer periphery region 3, the inner periphery region 5 is depressed lower than the outer periphery region, hole (b) of small diameter passing only dissociation liquid and dissociated fiber in the outer peripheral region 3, hole (a) of large diameter suitable for discharge of foreign matters in the inner periphery region and the rotor is made as a fitted shape with the strainers.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Object of the invention (industrial application field) The present invention is a pulper that performs difficult-to-dissolve treatment of waste paper raw materials. Specifically, the present invention relates to a pulper in which the refining effect is improved by changing the division method and shape of the large-diameter hole area and the small-diameter hole area of the strainer under the rotor, and changing the rotor accordingly.

(Prior art) Conventionally, in a pulper that treats waste paper raw materials that are difficult to dissolve, a rotor is provided at the center of the bottom of the tank, a flat strainer is provided on the outside of the rotor, and the strainer is divided into two fan-shaped areas, large and small. Then, a large diameter hole of 24 to 70 myn is provided in that small area,
Small diameter holes of 6 to 15 mm are provided in the large area, and the dissolution and syneresis liquid that has passed through each hole is purified through the small diameter holes, and the one that has passed through the large diameter holes is purified. A crude dissolution syneresis solution containing fibers and non-fibrous substances is treated with separate post-treatment equipment to improve processing efficiency, as disclosed in Japanese Patent Publication No. 58-1240 and Japanese Patent Application Laid-Open No. 61-215789.
It is publicly known in No.

(Problems to be Solved by the Invention) However, in the conventional pulper described above, the two large and small holes of the strainer are opened on the same plane, so the raw material concentrates in the particularly large hole, resulting in the refining and dissolution of the material. There was a problem in that the accuracy of sorting between syneresis and crude dissolved syneresis was reduced.

The present invention was made in order to solve the above-mentioned conventional problems, and the strainer is improved to have a concentric area and a non-planar strainer, and a rotor is fitted to the strainer to achieve purification, dissolution, and syneresis. The purpose of the present invention is to provide a pulper that is particularly effective in sorting between crude dissolution and syneresis.

1. Structure of the invention (means for solving the problem) The means of the present invention for achieving the above-mentioned object is to solve the problem by dissolving difficult-to-dissolve fibers (e.g., moisture-resistant paper) and non-fibrous materials (e.g., vinyl) in the processing raw material. Foreign matter such as sheets (sheets) have low water absorption, so when they are fed into the pulper, they float to the top of the raw material liquid in their original form against the fiber raw material that begins to soak in water, and collect near the center of the rotor and are removed. (This phenomenon is evidenced by the foreign matter covering or entangling the rotor when the pulper operation is interrupted and the raw material liquid in the tank is discharged.) This product was developed based on the idea that if the raw material is quickly discharged from a large-diameter hole without being shredded, the separation of the crude dissolution syneresis and purified dissolution syneresis can be carried out efficiently. In a pulper in which a rotor 9 is provided at the center of the bottom of the pulper and a strainer 3 is arranged around the rotor 9, the strainer 3 is divided into an inner peripheral area a and an outer peripheral area, and the inner peripheral area a is divided into an inner peripheral area a and an outer peripheral area. It is recessed lower than the outer peripheral area, and a large diameter hole 5 suitable for expelling foreign matter is provided in the inner peripheral area a, and a small diameter hole 6 is provided in the outer peripheral area to allow only the purified dissolution solution to pass through. In addition, the rotor is adapted to a strainer.

(Function) In the pulper configured as described above, the inner peripheral area a of the strainer 3 is more recessed than the outer peripheral area, and foreign objects such as sheets or strings descending toward the center of the rotor 9 can be prevented. , that is,
The large-diameter hole 5 cooperates with the rotor 9 to crush the material that is difficult to dissolve and release, and discharge it out of the tank 1. Therefore, in the flat outer peripheral area of the strainer 3, the dissolvable fiber raw material from which the hardly dissolvable substances are mainly flowed, is crushed by the cooperation of the small diameter holes 6 and the rotor 9, and is crushed through the holes 6. Those that can pass through are discharged to the outside of the tank 1, and so-called purification is performed in which any dissolvable substances are removed from the dissolvable fibers.

Then, the liquid of the sorted dissolvable fibers and the liquid of the hardly dissolvable substance flow separately into the downstream chambers 15 and 16 divided by the partition wall 17 below the strainer 3, and are not mixed with each other through the discharge port 18. and 19 to be sent to the next processing step.

(Example) An example of the implementation of a pulper related to the present invention will be described below based on the drawings.

In Figures 1 and 3 of the drawings, 1 is a tank in the pulper, and its planar shape is circular to facilitate swirling of the liquid.
The bottom part 2 of the tank 1 is divided into an inner circumferential area a on the center side and an outer circumferential area on the outer wall side, and the inner circumferential area a is The outer circumferential area is recessed downward from the side, and the shape and dimensions of the recess are as follows:
The standard shape is an inverted cone, as shown in Figures 1 and 3, although it is determined by the condition of the raw material to be processed and the amount of foreign matter mixed in, etc., and the outer peripheral area is shown in the same figure. A flat annular strainer 3 is fixed with bolts 4, and a large-diameter hole 5 with a diameter of 24 to 70 mm is provided in the inner circumferential area a of the strainer 3 to allow the hardly soluble substance to pass through.
A 6 to 15 m long area is provided in which only soluble fibers are allowed to pass through the outer peripheral area.
A small-diameter hole 6 with a diameter of m is provided, and a conventionally known receiving blade 7 is provided in the inner peripheral area a for cooperation with the blades of the rotor, which will be described later, or a receiving blade with the edge of the hole 5 as described above is provided. 7 to enhance the crushing effect, and protrusions 8 are provided between the six rows of small diameter holes in the outer peripheral area as shown in Figure 2 to enhance the dissolving power effect. That's how it is.

Reference numeral 9 denotes a rotor disposed in the tank 1 described above, and the bottom part 2 of the tank 1
A plurality of stirring blades 11.1 are fixed to a vertical rotating shaft 10 passing through the center of the shaft, and protrude radially from the center thereof.
The lower surface of the blades 11 and 12 is formed along the surface of the strainer 3, as shown in FIG.
, 5111m apart, and as shown in Fig. 3, the closer the blades are to the strainer 3 side, the more they recede to the opposite side of the rotation direction, and the receding angle is set at 3 to 15 degrees with respect to the axis. As shown on the left side of FIG. 1, on the front side of this blade part, a material such as stellite is used to crush dissolvable fibers of the raw material or foreign substances in cooperation with the inner circumferential area a and the outer circumferential area of the strainer 3. Blade plates 13 and 14, which have been subjected to wear-resistant treatment such as lining, are bolted to the blades. However, these blade plates 13.14 may not be attached to all the blades 11.12, but may be attached to every other blade 11.12. The blade plate 14 is not attached when the part corresponding to the inner circumferential area a of the strainer 3 is separated from the strainer 3 as shown on the right side of FIG. 1, and the strainer 3 does not have a crushing function and is intended to provide pulsation. Further, the blade portions of the blades 11 and 12 described above may be welded with Stellite to provide wear resistance, without attaching the blade plates 13 and 14 as described above.

The exit angle of the radial blades 11°12 in the rotor 9 is β1-0 to 20° at the large diameter part on the inner circumferential area a side of the strainer, and β1-0 to 20° on the outer circumferential area side, as shown in FIG. The large diameter portion is either straight at β2-15 to 30° or curved with this as a reference.

15 and 16 are downstream chambers provided below the strainer 3 and divided into two by an annular partition wall 17;
The outer downstream chamber 16 communicates with the small diameter hole 6 provided in the outer peripheral area, and the dissolvable fiber liquid is discharged into the inner downstream chamber 15 and sent to the next processing step. Outlet 1
8, and the outer downstream chamber 16 is provided with an outlet 19 for discharging the liquid of the dissolvable substance and sending it to the next process.

Reference numeral 20 denotes a discharge port provided at the bottom 2° near the retreating wall of the tank 1 described above, through which heavy foreign objects (iron stones, etc.) that could not pass through the strainer 3 are discharged and sent to the receiving section. .

C1 Effects of the Invention In the pulper of the present invention, the moisture-resistant paper that inhibits water absorption and the non-fibrous material that is difficult to dissolve and release float to the upper layer of the longitudinal flow, flow down toward the center of the rotor, and form the dents in the strainer. The pulp is crushed into coarse pieces by the sinking inner circumferential region, passes through the large-diameter hole, and is quickly washed away into the downstream chamber, so that the time for circulation and stagnation in the pulper tank is shortened.

Since the difficult-to-dissolve and dissociate substances on the small diameter side of the rotor are quickly crushed at a location where they can be easily grasped, the technology is improved compared to conventional processing on the large diameter side. .

A rope is hung inside the pulper tank to wrap around foreign matter and discharged outside the tank.Residual materials with difficult shapes that cannot be contained in the lugger can be processed and recovered, so pulper operations can be stopped to clean the inside of the tank. By saving labor, you can increase operating efficiency and improve operability.

It has the following unique effects.

[Brief explanation of the drawing]

FIG. 1 is a longitudinally sectional side view of a main part of an embodiment of a pulper according to the present invention. Figure 2 is a plan view of the same as above. FIG. 3 is a longitudinal sectional side view showing an enlarged main part of another embodiment same as the above. 1: Tank 2: Bottom 8: Rotor 3 Strainer a: Inner area b: Outer area 5: Large diameter hole 6: Small diameter hole procedure amendment (voluntary) 1 September 3, 1988

Claims (1)

[Claims] In a pulper, a rotor is installed at the center of the bottom of a tank containing raw materials, and a strainer is installed around this rotor.
The strainer is divided into an inner circumferential area and an outer circumferential area, the inner circumferential area is recessed lower than the outer circumferential area, and a large diameter hole suitable for discharging foreign matter is provided in the inner circumferential area, and the outer circumferential area is A pulper characterized in that the rotor is provided with small diameter holes through which only purified dissolved syneresis liquid passes, and the rotor is adapted to a strainer.