JP2614695B2 - Pulp molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding machine for molding a pulp mold from pulp slurry, and more particularly to a pulp molding machine having a means for cleaning a suction hole of a molding die.

[0002]

2. Description of the Related Art When a predetermined product or the like is transported, the product or the like is packed in a state of being fitted with a packing material having a recess corresponding to the shape of the product or the like. Such a packing material is usually made of a relatively expensive material such as expanded polystyrene, which increases the cost and makes the disposal process difficult.

[0003] On the other hand, for the purpose of effective use of recovered resources and the like, packing materials are manufactured from waste paper pulp such as cardboard and newspaper, and such packing materials are called pulp molds. I have. Such a pulp mold usually uses a molding die having a molding surface of a corresponding shape and formed with a large number of suction holes opened in the molding surface, and the molding surface of the molding die is put into pulp slurry. The pulp is formed by sucking the pulp from the suction hole in the immersed state and adsorbing the pulp on the forming surface.

[0004]

Such a mold has a relatively large suction hole (for example, about φ2 to 3 mm) at a predetermined interval, and is formed by fixing a wire mesh or the like to the molding surface. . However, in the mold having such a structure, since the distance between the suction holes is large, the amount of adsorption differs between a portion close to the suction hole and a portion far from the suction hole, so that an accurate pulp mold cannot be obtained, and a wire mesh or the like is formed. There is a problem in that it takes time and effort to mount the pulp on the surface, and the accuracy of the pulp mold is affected by the accuracy of the wire mesh or the like even if the mold is manufactured with high accuracy.

[0005] Therefore, by forming a large number of small (for example, φ0.2 to 0.3 mm ) suction holes opened in the molding surface, the pulp slurry is relatively uniformly adsorbed on the molding surface without fixing a wire mesh or the like. Porous molds have been proposed. However, in a pulp mold manufacturing apparatus, in order to remove a pulp mold piece clogged in a wire mesh or a suction hole of a molding die, air is injected from the inner surface of the molding die after the demolding process. With a molding die having a small hole, this removing effect is small, and clogging cannot be removed by molding about 100 to 300 times. In such a case, clogging could be easily eliminated by removing and cleaning or replacing the wire net in the case of the conventional mold, but in the case of a mold in which the wire mesh was not fixed, the mold itself was removed. Cleaning was required, requiring much labor and effort.

By the way, for example, US Pat.
No. 26 has a mold cleaning function that can solve the above problems.
Is described. this
In the pulp molding machine, carry out the above demolding process
The mold release part and the molding surface of the mold are immersed in pulp slurry to absorb
Molding part that absorbs pulp on the molding surface by drawing
Cleaning of the mold with the molding surface positioned below
Is provided. Therefore, the mold
In the process of being transported from the demolding section to the molding section,
And spray water or a cleaning liquid toward the surface of the mold.
The mold Suction hole by introducing steam or hot water inside
Do not remove the mold by discharging
And clogging is effectively removed. However, this
When the pulp molding machine has a washing function like
Prevents dilution and contamination of pulp slurry by water and washing liquid
There is a need to. Therefore, the pallets described in the above patents
In a pre-molding machine, a large number of molds are
On the transport path to transport to the forming section and the demolding section, etc.
To provide a cleaning unit at a position sufficiently separated from the molding unit
Prevents more water and washing liquid from entering the pulp slurry tank
The spray device and water that constitute the cleaning section
The configuration of the equipment is limited due to the limited
There is a problem that it becomes complicated.

The present invention has been made in view of the above circumstances, and has as its object to reduce the clogging of the suction hole without complicating the device configuration in the above-described porous mold. It is an object of the present invention to provide a pulp molding machine capable of effective removal.

[0008]

Means for Solving the Problems To achieve the above object, the gist of the present invention is to provide a mold having a large number of suction holes opened in a molding surface, and the mold is used in a pulp slurry tank. A molding machine for molding a pulp mold by immersing the pulp inside and sucking the pulp in the pulp slurry on the molding surface by suction from the suction hole, wherein (a) the pulp mold is released. Pulp slurry
The pulp slurry is immersed in the mold.
A water introducing means for introducing water in the tank, and (b) washing the suction hole of the mold by introducing compressed air into the mold and injecting water and compressed air from inside the mold. And compressed air introduction means.

[0009]

[Operation and Effect of the Invention] In this way, the inside of the mold
The water introduced into the pulp reduces the adsorbing power of the pulp mold pieces to the wall of the suction hole, and the clogging of the suction hole is effectively done by the pressure of the air-water mixture of air and water with a larger mass. Is removed. In this case,
The filling means is by immersing the mold in pulp slurry.
Is to introduce the water in the pulp slurry tank into the mold.
For this reason, a new device for introducing water into the mold
It is not necessary to additionally provide
Moisture introduced into the mold is temporarily removed from the pulp during washing.
Supplied from the slurry and immediately returned to the pulp slurry
From this, because the water in the pulp slurry does not increase or decrease almost,
Wash liquid dilutes or contaminates pulp slurry
The arrangement of the washing unit may be restricted for the purpose of suppressing
Absent. Therefore, without complicating the device configuration,
The clog can be effectively removed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a diagram showing an example of a pulp molding machine 10 to which the present invention is applied. In this pulp molding machine 10, a slurry pulp slurry 12 in which pulp having a concentration of about 1% is dispersed in water is stored in a liquid tank 14, and a pair of pulp slurry 12 having the same configuration is stored in the pulp slurry 12. Molds 16a and 16b are alternately immersed. The molding dies 16a and 16b are
The supporting arms 20a and 20b are integrally provided on the surfaces of the bases 18a and 18b opposite to the molding dies 16a and 16b, respectively.

The liquid tank 14 is supplied with pulp slurry from a supply tank 27 connected via a pump 26 by a liquid feed pipe 24 so that the liquid level 22 of the pulp slurry 12 is maintained within a predetermined range. It is to be replenished. A rotating shaft 28 is rotatably supported by a supporting device (not shown) in a state where the axis of the rotating shaft 28 is perpendicular to the plane of the paper of FIG. The molding dies 16a and 16b are supported by the rotating shaft 28 in a state where they are shifted from each other by 180 degrees by fixing the 20b to the rotating shaft 28, respectively. Mold 16
a and 16b are alternately positioned at an upper position and a lower position by being rotated by 180 degrees by a driving device 30 connected to a rotating shaft 28, and are positioned at a lower position in FIG. The forming mold 16 b is immersed in the pulp slurry 12 in the liquid tank 14 .

The molding dies 16a and 16b are made porous by combining a filler such as glass beads with a resin binder.
As shown in FIG. 3, the recesses 32 are respectively provided on the surface on the base 18 side, and a large number of open pores having a diameter of about 0.2 to 0.3 mm for communicating between the molding surface 34 and the recesses 32 are respectively formed. Have. The recesses 32 of the molds 16a and 16b are provided with holes 36 of the base 18 and support arms 20a, 20b.
Hole 38, a passage (not shown) provided in the rotary shaft 28,
And a suction device 44, a compressor 46, and a drain 4 via piping 40a, 40b and switching valves 42a and 42b, which communicate with the passage in the rotary shaft 28 so as to be relatively rotatable.
8 respectively. That is, the molding die 16a
Is the pipe 40a, the switching valve 42a, and the mold 16b is the pipe 4
0b and the switching valve 42b. Further, the switching valves 42a and 42b and the driving device 30
Is controlled by the control device 50. In this embodiment, the open pores correspond to suction holes.

The operation of the pulp molding machine 10 constructed as described above will be described below with reference to FIGS. 1 and 3, except that the two molds 16a and 16b are exactly the same except that they differ by a half cycle. Mold 16b
This will be mainly described. FIG. 3 is a time chart showing a change in the pressure inside the mold 16, and the horizontal axis represents the elapsed time.
The vertical axis represents pressure, where a is the mold 16a and b is the mold 1
6b. During the rotation operation of the rotating shaft 28, the state inside the molding die 16 is maintained at the state immediately before it, and therefore, the time during rotation is omitted in this time chart. At time 0, the mold 16b is located outside the liquid tank 14 (upside down in FIG. 1), and the pipe 40b is connected to the drain 48 by the switching valve 42b. At time t1, when the support arm 20 is rotated by 180 degrees by the rotating shaft 28, the mold 16b is positioned at the lower position, and the pulp slurry 12
And the moisture is introduced into the mold 16b. After a lapse of a predetermined time, for example, 2 to 3 seconds after the immersion, the switching valve 42b is operated at a time t2, so that the compressed air from the compressor 46 at a pressure of, for example, about 5 kgf / cm ² is immersed in the molding die 16b. Introduced,
The water is sprayed from the inside of the molding die 16b together with the above-mentioned water to remove clogging in the open pores.

Next, at time t3, the switching valve 42b is operated again, and the suction device 44 causes the hole 3 in the base 18a to be opened.
The pulp in the pulp slurry 12 is sucked from the pulp 6 and the recess 32 is kept at a negative pressure for a predetermined time, so that
Is adsorbed on the molding surface 34. For this reason, the molding die 16b
A pulp mold 52 having a shape corresponding to the uneven shape of the molding surface 34 and having a thickness of, for example, about 2 mm is formed thereon. Next, at time t4, the molding die 16b
While continuing the suction, the support arm 20 is rotated by 180 degrees to position the other mold 16a at the lower position, and the clogging of the open pores of the mold 16a is performed as in the case of the mold 16b described above. Is performed, the molding of the pulp mold 52 is also started on the molding die 16a. At the same time, the pulp mold 5 on the mold 16b positioned at the upper position
2, suction drying is performed for a predetermined time in order to quickly reduce the water content, and thereafter, at time t5, the switching valve 42b is operated again, and the compressed air from the compressor 46 is injected from the open pores, The mold is released by a handling device (not shown) and sent to a dryer in the vicinity.
When the release is completed, the switching valve 42b is operated at time t6, and the pipe 40b is connected to the drain 48. In this series of steps, one cycle is performed in about 1 minute. Steps after the drying are not necessarily required for understanding the present invention, and thus description thereof is omitted.

As described above, the pulp molding machine 10 of the present embodiment immerses the molding die 16 in the pulp slurry 12,
After a lapse of a predetermined time, moisture in the pulp slurry 12 is introduced into the recess 32 inside the mold 16, and the open pores of the mold 16 are impregnated with moisture, and are fixed in the open pores by the drying. When the mixed pulp mold piece is easily peeled off and the air-water mixture of moisture and air impregnated in the recess 32 is thereafter injected, the pressure effectively removes the clogging in the open pores. It is. For this reason, even when using a mold as in this embodiment, which does not have a straight suction hole as opened by a conventional drill or the like, and has open pores, i.e., complicated suction holes, is sufficiently washed. Is performed. Therefore, as compared with the case where only air is simply injected, cleaning is performed effectively, the number of times of removing and cleaning the molding die 16 is reduced, and at the same time, a wire net or the like is replaced using a conventional molding die. Washing is performed more efficiently. As described above, in the present embodiment, the switching valve 42, the drain 48, and the control device 50 correspond to water introducing means, and the switching valve 42, the compressor 46, and the control device 50 correspond to compressed air introducing means.

[0017] Moreover, according to this embodiment, water is introduced into the mold 16 to be subjected to washing, the mold 16
Is immersed in the pulp slurry 12 so that
It is one that is introduced from, for supplied from temporarily pulp slip 12 within during cleaning, is immediately discharged in the pulp slip 12, in pulp mud 12, the mold from the outside 1
Compared with the case of injecting the water introduced into 6, the increase or decrease of the water content of the pulp slurry 12, that is, a change in concentration hardly occurs,
Easy to manage. Therefore, introduce water into the mold
Cleaning unit equipped with a device for
Since there is no need to provide a new device, the device configuration is simple.

Further, when the molding die 16 is immersed in the pulp slurry 12 for molding, cleaning, that is, removal of clogging is carried out by securing a slight leaving / spraying time, so that the process becomes particularly long. And the device is not complicated.

While the embodiment of the present invention has been described in detail with reference to the drawings, the present invention can be embodied in still another embodiment.

In the above embodiment, the molding die 16 is φ
Although it was formed of a porous body having open pores (suction holes) of 0.2 to 0.3 mm, the present invention effectively removes clogging of the suction holes, and has the above range. Although it is particularly effective for a mold having a suction hole, the size of the suction hole is not limited to the above range. For example, for the purpose of omitting a molding die made of a similar porous body having a suction hole of φ0.2 mm or less or φ0.3 mm or more, a wire mesh or the like, a suction hole (φ
2 to 3 mm) with a hole (φ0.
2 to 0.3 mm).

Although only a pulp molding machine having two molding dies 16 is shown, the present invention can be similarly applied to a molding machine having more molding dies.

In the examples , the standing time before injecting compressed air after immersion is not limited to 2 to 3 seconds, and is appropriately determined according to the shape of the mold, the concentration of pulp slurry, additives and the like. Things.

The pressure of the compressed air, the injection time and the like are determined according to the shape of the molding die, the size of the suction hole, and the like.

Although not specifically exemplified, the present invention can be variously modified without departing from the gist thereof.

[Brief description of the drawings]

FIG. 1 is a diagram showing a pulp molding machine according to one embodiment of the present invention.

FIG. 2 is an enlarged view showing a molding die in FIG. 1;

FIG. 3 is a time chart showing a pressure change in a molding die in the pulp molding machine of FIG.

[Explanation of symbols]

 10: Pulp molding machine 12: Pulp slurry 14: Liquid tank 16: Mold 42: Switching valve 46: Compressor

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Tokichi Hirano 3-36 Noritakeshinmachi, Nishi-ku, Nagoya-shi, Aichi Prefecture Noritake Co., Ltd. (56) References US Patent 3228826 (US, A)

Claims (1)

(57) [Claims] 1. A pulp in a pulp slurry, wherein the dies are immersed in a pulp slurry tank and suctioned from the suction holes to form a plurality of suction holes in the pulp slurry. by adsorbing the, a molding machine for molding a pulp mold, Pas said mold in a state in which the pulp mold is mold release
By immersing the mold in a mold slurry, the
A water introducing means for introducing moisture in the lump mud tank; and a compression for cleaning a suction hole of the molding die by introducing compressed air into the molding die and jetting water and compressed air from inside the molding die. A pulp molding machine comprising: an air introducing means.