JPH073700A - Pulp-molding machine - Google Patents

Abstract

PURPOSE:To provide a pulp-molding machine capable of effectively removing loadings in a suction hole of a mold for a porous material. CONSTITUTION:In this pulp-molding machine 10, if a support arm 20 is turned 180 deg. on a state where pipings 40 are connected to a drain 48, one of (16b in the fig. 1) molds 16a and 16b is allowed to come to the lower position and dipped in pulp slurry 12 in a liquid tank 14. After passage of a specific time from dipping, a switch valve 42b is operated so as to supply compressed air from a compressor 46 to the dipped mold 16b. Thus, loadings in its open pores can be removed.

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 equipped with a means for cleaning suction holes 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 by a packing material having a recess corresponding to the shape of the product or the like. Such a packaging material is usually made of a relatively expensive material such as expanded polystyrene, which increases the cost and makes disposal difficult.

On the other hand, a packing material is manufactured from pulp of waste paper such as corrugated cardboard and newspaper for the purpose of effectively utilizing recovered resources. Such a packing material is called a pulp mold. There is. Such a pulp mold usually has a molding surface having a corresponding shape and has a large number of suction holes opened in the molding surface, and the molding surface of the molding die is placed in pulp slurry. It is molded by sucking it from the suction hole in the immersed state and adsorbing the pulp on the molding surface.

[0004]

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

Therefore, by forming a large number of small suction holes (for example, about φ0.2 to 0.3 mm) opening on the molding surface, the pulp sludge is relatively uniformly adsorbed on the molding surface without sticking a metal mesh or the like. A porous mold has been proposed. However, in the pulp mold manufacturing apparatus, in order to remove the pulp mold pieces clogging the wire mesh or the suction holes of the molding die, air is injected from the inner surface of the molding die after the demolding step. This removal effect is small with a mold having small holes, and it becomes impossible to remove the clogging after 100 to 300 times of molding. In such a case, the conventional mold could easily remove the clogging by removing the wire mesh and cleaning or replacing it, but in the case of a mold with no fixed wire mesh, remove the mold itself. It was necessary to clean it with a lot of time and labor.

The present invention has been made in view of the above circumstances, and an object thereof is a pulp mold capable of effectively removing clogging of suction holes in a porous molding die as described above. To provide a molding machine.

[0007]

In order to achieve such an object, the gist of the present invention is to have a molding die in which a large number of suction holes are opened on the molding surface, and the molding die is a pulp slurry tank. A molding machine for molding a pulp mold by immersing it in and sucking the pulp in the pulp slurry onto its molding surface by sucking through the suction hole, wherein the pulp mold is in a released state. Water introducing means for introducing water into the mold, and compressed air for introducing compressed air into the mold and injecting water and compressed air from the inside of the mold to wash suction holes of the mold. And introducing means.

[0008]

In this way, water reduces the adsorption force of the pulp mold piece on the wall surface of the suction hole and the pressure of the air-water mixture of air and water having a larger mass than that reduces the adsorption force. , The clogging of the suction hole is effectively removed.

Preferably, the water introducing means introduces the water in the pulp slurry tank into the mold by immersing the mold in the pulp slurry. In this way, the suction force on the suction hole wall surface of the pulp mold piece is reduced in advance by the water introduced into the molding die, and the suction hole is then washed by the injection of compressed air, so that the clogging is further effective. Will be removed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below 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 mold molding machine 10, a pulp slurry 12 in a slurry state in which a pulp having a concentration of about 1% is dispersed in water is stored in a liquid tank 14, and the pulp slurry 12 has a pair of identical configurations. The molding dies 16a and 16b are alternately dipped. The molding dies 16a and 16b have a base 18
The bases 18a and 18b are integrally mounted on the upper surfaces of the bases 18a and 18b, respectively, and support arms 20a and 20b are integrally provided on the surfaces of the bases 18a and 18b opposite to the molding dies 16a and 16b.

The liquid tank 14 is supplied with pulp pulp from a replenishment tank 27 connected via a pump 26 via a liquid feed pipe 24 so that the liquid surface 22 of the pulp slurry 12 is kept within a predetermined range. It is supposed to be replenished. A rotary shaft 28 is rotatably supported above the rotary shaft 28 by a supporting device (not shown) with its axis centered at right angles to the paper surface of FIG. 1, and supports the pair of molds 16a, 16b. By fixing 20b to the rotary shaft 28, the molds 16a and 16b are supported by the rotary shaft 28 in a state of being displaced from each other by 180 degrees. Mold 16
The a and 16b are rotated 180 degrees by a drive device 30 connected to the rotary shaft 28 so that they are alternately positioned in an upper position and a lower position, and are positioned in a lower position in FIG. The forming mold 16b is immersed in the pulp slurry 12 in the liquid tank 12.

The molding dies 16a and 16b are made of a porous material by binding a filler such as glass beads with a resin binder. For example, the molding dies 16b are shown in FIG.
As shown in FIG. 3, each of the bases 18 has a recess 32 on the surface thereof, and a large number of open pores of about φ0.2 to 0.3 mm for communicating between the molding surface 34 and the recess 32, respectively. Have The recesses 32 of the molding dies 16a and 16b include the holes 36 of the base 18 and the support arms 20a and 20b.
Hole 38, a passage (not shown) provided in the rotary shaft 28,
And the suction device 44, the compressor 46, and the drain 4 via the pipes 40a and 40b and the switching valves 42a and 42b that are rotatably connected to the passage in the rotary shaft 28.
8 are connected respectively. That is, the molding die 16a
Is the pipe 40a, the switching valve 42a, and the molding die 16b is the pipe 4
0b and the switching valve 42b, respectively. In addition, the switching valves 42a and 42b and the drive device 30.
The operation is controlled by the control device 50. In the present embodiment, the open pores correspond to suction holes.

The operation of the pulp molding machine 10 configured as described above will be described below with reference to FIGS. 1 and 3, but the two molding dies 16a and 16b are exactly the same except that they differ by half a cycle. The operation of the mold 16b
I will explain mainly. FIG. 3 is a time chart showing changes in pressure inside the molding die 16, in which the horizontal axis represents elapsed time,
The vertical axis represents pressure, where a is the mold 16a and b is the mold 1.
6b respectively. During the rotating operation of the rotary shaft 28, the internal state of the molding die 16 is maintained immediately before, so the time during rotation is omitted in this time chart. At time 0, the molding die 16b is outside the liquid tank 14 (upside-down position from 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 180 degrees by the rotating shaft 28, the molding die 16b is positioned at the lower position, and the pulp slurry 12 in the liquid tank 14 is
It is dipped therein and its water content is introduced into the molding die 16b. After a lapse of a predetermined time, for example, 2 to 3 seconds after the immersion, the switching valve 42b is operated at the time t2 so that the compressed air of the pressure of about 5 kgf / cm ² from the compressor 46 is immersed in the forming mold 16b. Was introduced,
It is sprayed from the inside of the molding die 16b together with the above-mentioned water, and the clogging in the open pores is removed.

Next, at time t3, the switching valve 42b is operated again, and the suction device 44 causes the hole 3 of the base 18a to move.
6 is sucked from the concave portion 32 and negative pressure is applied to the recess 32 for a predetermined time, so that the pulp in the pulp sludge 12 is molded by the mold 16b.
Is adsorbed on the molding surface 34 of. Therefore, 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 molded on the top. Next, at time t4, the molding die 16b
The support arm 20 is rotated 180 degrees while continuing the suction of the other to position the other mold 16a at the lower position, and the open pores of the mold 16a are removed as in the case of the mold 16b described above. After that, 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 molding die 16b positioned at the upper position
In No. 2, suction drying was performed for a predetermined time in order to quickly reduce the water content, then the switching valve 42b was operated again at time t5, and the compressed air from the compressor 46 was injected from the open pores. It is released from the mold by a handling device (not shown) and sent to a dryer in the vicinity.
When the mold release is completed, the switching valve 42b is operated at time t6 to connect the pipe 40b to the drain 48. One cycle of this series of steps is performed in about 1 minute. It should be noted that the description of the steps after drying is omitted because they are not necessary for understanding the present invention.

As described above, in the pulp mold molding machine 10 of this embodiment, after the molding die 16 is immersed in the pulp slurry 12,
After a lapse of a predetermined time, the water content in the pulp slurry 12 is introduced into the recess 32 inside the molding die 16 and the open pores of the molding die 16 are impregnated with the water, and are fixed in the open pores by the drying. When the pulp mold pieces are easily peeled off, and then the air-water mixture of water and air impregnated in the recess 32 is sprayed, the pressure effectively removes the clogging in the open pores. Of. For this reason, even when using a molding die such as this embodiment which does not have a straight suction hole like a conventional drill etc. and has open pores, that is, suction holes, is thoroughly cleaned. Is done. Therefore, compared with the case where only air is simply injected, cleaning is performed more effectively, the number of operations for removing the mold 16 and cleaning is reduced, and the case where the wire net or the like is replaced using the conventional mold. Cleaning is performed more efficiently than that. As described above, in the present embodiment, the switching valve 42, the drain 48, and the control device 50 correspond to the water introducing means, and the switching valve 42, the compressor 46, and the control device 50 correspond to the compressed air introducing means, respectively.

Further, according to the present embodiment, the water introduced into the mold 16 for cleaning is temporarily supplied from inside the pulp slurry 12 during cleaning and immediately discharged into the pulp slurry 12. Therefore, as compared with the case where the water introduced from the outside into the molding die 16 is injected into the pulp slurry 12, the increase or decrease of the water content of the pulp slurry 12, that is, the concentration change hardly occurs, and the management is easy. .

Further, when the molding die 16 is dipped in the pulp slurry 12 for molding, a slight standing time and a jetting time are ensured for cleaning, that is, removal of the clogging, so that the process becomes particularly long. The device does not become complicated.

Next, another embodiment of the present invention will be described. In the following embodiments, the same parts as those in the above-described embodiments are designated by the same reference numerals and the description thereof will be omitted.

The pulp molding machine 54 shown in FIG.
The structure is similar to that of FIG. 1 of the first embodiment, but the switching valve 42 has three ports and is not connected to the drain, and the steam-water mixer is provided between the compressor 46 and the switching valves 42a and 42b. A switching valve 60 that is also connected to another compressor 58 via 56 is provided, and the switching valve 60 is also connected to the control device 50. This pulp molding machine 54
In this case, the mold 16 is rotated by the rotation of the support arm 20.
b is located at the lower position, and the pulp slurry 1 in the liquid tank 14
Immediately after being dipped in the mold 2, the switching valve 42b is actuated, suction is performed by the suction device 44, and the pulp is adsorbed on the forming surface 34 of the forming die 16b. Next, the support arm 20 is moved to 1 while continuing the suction of the molding die 16b.
The other mold 16a is rotated by 80 degrees to be positioned at the lower position, and the pulp mold 52 is started to be molded on the mold 16a as well as the mold 16b.

On the other hand, at the same time, the pulp mold 52 on the molding die 16b positioned at the upper position is sucked and dried in order to quickly reduce the water content. After reaching the predetermined water content, when the switching valve 42b is actuated and the pulp mold 52 is released in the same manner as in the first embodiment, the switching valve 60 is actuated to obtain the steam-water mixer 56. A mixture of air and water (a mixture of air and water) is formed in the recess 32 of the molding die 16b.
Is injected into the mold to remove the clogging in the open pores of the mold. The removal of the clogging does not necessarily have to be performed at the position where the mold release is performed.
It may be performed while the support arm 20 is rotating. In this embodiment, water and air are introduced into the mold 16 at the same time, and the switching valve 42, the controller 50, the steam mixer 56, the compressor 58 and the switching valve 60 are used as water introducing means. And corresponds to the air introduction means.

In the pulp mold molding machine 54, since the air-water mixture is sprayed, the moisture causes the pulp mold pieces fixed in the open pores to be easily peeled off by drying, as in the first embodiment. In addition, the pressure of the air-water mixture effectively removes the clogging in the open pores. Therefore, also in the present embodiment, compared with the case where only air is simply injected, cleaning is performed more effectively, the number of operations for removing the mold 16 and cleaning is reduced, and the conventional mold is used. Cleaning is performed more efficiently than when replacing the wire mesh or the like.

Further, in this embodiment, since suction is performed immediately after being immersed in the pulp slurry, more efficient molding and
Cleaning is performed.

Although one embodiment of the present invention has been described in detail with reference to the drawings, the present invention can be implemented in still another mode.

In the above-mentioned embodiment, the molding die 16 is φ
Although it is formed of a porous body having open pores (suction holes) of 0.2 to 0.3 mm, the present invention effectively removes the clogging of the suction holes and has the above range. However, the size of the suction hole is not limited to the above range. For example, in order to omit a molding die formed of a similar porous body having a suction hole of φ0.2 mm or less or φ0.3 mm or more, a wire net, etc., a suction hole (φ
2 to 3 mm) and a hole (φ0.
2 to 0.3 mm) and the like.

Further, as the pulp mold molding machine, only the one equipped with the molding dies 16 at two positions is shown, but the present invention can be similarly applied to a molding machine having more molding dies.

Further, in the first embodiment, the standing time until the compressed air is jetted after immersion is not limited to 2-3 seconds,
It is appropriately determined depending on the shape of the molding die, the concentration of pulp slurry, additives, and the like.

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

In the second embodiment, the air / water mixer 56 and the compressor 58 are provided to supply the air / water mixture. For example, the molding machine of the first embodiment is provided with the pipe 40 and the support. A pump for supplying water, which is connected to the passage in the arm 20 or the rotary shaft 28, the hole 36 of the base 18 of the molding die, and the like, is provided so that the controller 50 can be operated simultaneously with the compressor 38 during cleaning. good. Further, the injection of the air-water mixture by these may be performed in the pulp slurry 12, in which case the change in the concentration of the pulp slurry 12 due to the injected water does not adversely affect the quality of the pulp mold 40. The injection amount, the concentration of pulp slurry supplied from the supply tank 27, and the like may be managed.

Although not illustrated one by one, the present invention can be variously modified without departing from the spirit thereof.

[Brief description of drawings]

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

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

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

FIG. 4 is a view corresponding to FIG. 1 and showing another embodiment of the present invention.

[Explanation of symbols]

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

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tokiyoshi Hirano 3-36 No. 1 Noritake Shinmachi, Nishi-ku, Nagoya-shi, Aichi Prefecture Noritake Company Limited Limited

Claims (2)

[Claims] 1. A pulp having a large number of suction holes opened on a molding surface, the molding die being immersed in a pulp sludge tank and sucked through the suction holes to form a pulp in the pulp sludge on the molding surface. Is a molding machine for molding a pulp mold by adsorbing, and water introducing means for introducing water into the molding die in a state where the pulp mold is released, and introducing compressed air into the molding die. And a compressed air introduction unit for cleaning the suction holes of the mold by injecting water and compressed air from the inside of the mold. 2. The pulp mold according to claim 1, wherein the water introducing means introduces the water in the pulp slurry tank into the mold by immersing the mold in the pulp slurry. Molding machine.