JPH10329114A - Method and apparatus for sheet molding process - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance a molding-shape accuracy with small consumption of thermal energy by comminuting papers to miniaturize then, adding adhesive and small amount of water therein, kneading it to incorporate fluidity, sending it to a screw of an injection molding machine, again kneading it, injection molding it, and solidifying it in a mold, thereby reducing use of water as much as possible, and eliminating a problem of waste water treatment. SOLUTION: Waste paper introduced into a communicator 1 is communicated, miniaturized, discharged via a funnel-like discharge port, conveyed in an air duct 10 by wind of a blower 9, and separated from the air by a centrifugal force of a cyclone 11. When the paper becomes a predetermined amount in a metering duct 12 at a lower part of the cyclone 11, a valve is opened, and introduced into a mixer 2. Then, adhesive is added, agitated, mixed, then small amount of water is added, kneaded to generate mixture having fluidity, which is introduced into a supply unit 3. The mixture is fed in each suitable amount to an injection molding machine 31 by a supply screw of the unit 3, again kneaded, compressed, injected under high pressure, and then continuously molded. Use of water is reduced as much as possible to eliminate a problem of treating waste water. Then, consumption of energy is reduced, and molding shape accuracy is maintained high.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper forming method and a paper forming apparatus for mainly processing a container or a packaging material using waste paper.

[0002]

2. Description of the Related Art Used paper (old newspapers, old magazines, old corrugated paper,
For reuse of old OA paper), there is a method of forming it into a packaging material typified by, for example, an egg tray in addition to using recycled paper. For example, in order to form an egg tray from waste paper, a molding method called a wet molding method has been widely adopted. The wet molding method is a molding method in which waste paper is defibrated with water, and a fiber component is adsorbed by a vacuum mold, and then a molded product is obtained by evaporating water in a drying furnace of a released primary molded product.

[0003]

In the conventional paper forming method as described above, sludge-like wastewater is generated when the used paper is defibrated with water, and this wastewater treatment poses various problems such as environmental problems. . In addition, the primary molded product contains a large amount of water, and a large amount of heat energy is consumed to evaporate and dry the water. Furthermore, in order to obtain a shape by adsorbing the fiber component in a vacuum type, only one surface is given a shape, and the remaining surface is subjected to molding, and the accuracy of the molded shape is extremely low. Therefore, even if it can be used as it is in an egg tray or the like, molding a packaging material such as an industrial product requires a step of reshaping with another upper and lower set mold.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. One object of the present invention is to solve the problem of wastewater treatment by minimizing the use of water and to reduce heat energy consumption. It is an object of the present invention to develop a paper forming method capable of improving the accuracy of the formed shape with a small amount of paper. Another object of the present invention is to enable a paper processing apparatus to contribute to improvement of a working environment.

[0005]

According to the present invention, there is provided a paper forming method comprising the steps of: pulverizing a paper to be fine; and bonding the finely divided paper to an adhesive. It is characterized in that it is fed into a screw of an injection molding machine in a state of imparting fluidity by adding a small amount of water and kneading, and then re-kneaded, injection-molded and solidified in a molding die.

According to the present invention, since almost dry paper is crushed without using water, sludge-like wastewater does not occur, and only the mixture of the finely divided paper and the adhesive has fluidity. Because only a small amount of water is used, most of the water will evaporate during molding.

According to a second aspect of the present invention, there is provided a paper forming and processing apparatus, comprising: a pulverizing apparatus for pulverizing a paper to be charged; The mixing device that has fluidity by mixing and kneading is communicated by an air path capable of blowing air from the pulverizing device side to the mixing device side, and the paper fluidized by the supply device connected to the mixing device. It is configured to supply the mixture with the adhesive directly to the injection molding machine.

In this invention, the paper pulverized and fined by the pulverizing device is sent to a mixing device through an air path, mixed with an adhesive in the mixing device, and kneaded by adding a small amount of water to impart fluidity. Then, it is directly supplied to the injection molding machine by the supply device, and is formed into a molded product.

According to a third aspect of the present invention, in the paper forming apparatus according to the second aspect, a cyclone is provided immediately before the mixing device, the cyclone being connected to an air path and separating finely divided paper from air.
The air path and the mixing device are communicated through the cyclone, and the cyclone and the suction side of the air blowing means are communicated via a return air path, and a dust filter is provided upstream of the air blowing means in the return air path. Is provided.

According to the present invention, the finely divided paper is sent to the cyclone by the airflow flowing in the air path, separated from the air by the cyclone, and supplied to the mixing device. Then, the air separated by the cyclone is returned to the blowing means via the return air path via the dust collecting filter and circulates, and the forming process is performed in a closed path having no open portion in the middle.

[0011]

Next, an embodiment of the present invention will be described. The paper forming and processing apparatus shown in FIGS. 1 to 6 is an apparatus for performing the paper forming and processing method according to the present invention for forming and processing paper without using water as much as possible. And As shown in FIG. 2, the crushing device 1 is provided with rotating crushing teeth 5 in a drum-shaped outer shell 4, and the used paper (used paper) is input from an input port 7 having a pair of rotating feeding teeth 6. Newspapers, old magazines, old corrugated paper, old OA paper, etc.) are crushed by the crushing teeth 5 to make them fine. Crusher 1
In the lower part of the outer shell 4, there is provided a sieve-like outlet 8 for discharging the finely used waste paper. The discharge port 8 is open in an air passage 10 in which air is blown from the pulverizer 1 to the mixer 2 by a blower 9 serving as a blower.

The air passage 10 is a conveyance passage for conveying the finely divided waste paper falling from the discharge port 8 by the wind formed by the blower 9, and the downstream end thereof is a cyclone 11 as shown in FIG.
Contact The cyclone 11 is a separation device that separates the finely-divided waste paper carried in from the air passage 10 from the air by centrifugal force. A measuring duct 12 is connected to a lower end configured in a hopper shape. Cyclone 11 and blower 9
The return air passage 13 communicates with the suction port, thereby forming a closed loop in the air passage system. As shown in FIG. 1, a dust collecting device 14 is provided upstream of the suction port of the blower 9 in the return air passage 13.

The dust collecting device 14 has a dust collecting filter 15 for collecting dust such as paper dust contained in the airflow flowing through the return air passage 13, and removes the dust and cleans the air to the blower 9. send. The dust collecting device 14 is provided with a cleaning mechanism for cleaning the dust collecting filter 15. The cleaning mechanism comprises a filter valve 16 for opening and closing a return air passage 13 on the outlet side of the dust collecting filter 15 and an air supply means 17 for injecting compressed air to the dust collecting filter 15 in a direction opposite to the filtering direction. By closing the valve 16 and injecting compressed air to the dust collecting filter 15 by the air supply means 17, the dust collected by the dust collecting filter 15 is peeled off and dropped into a dust collecting box 18 provided below. The cleaning operation of the dust collecting filter 15 by the cleaning mechanism is performed at regular intervals by a timer (not shown).

The measuring duct 12 connected to the lower part of the cyclone 11 is provided with measuring valves 19 and 20 at the upper and lower parts as shown in FIG. When a certain amount is reached, the lower valve 20 is opened and a certain amount of finely used waste paper is put into the mixing device 2. The mixing device 2 includes main and secondary mixing fins rotating in a cylindrical drum 21, water injection means 22 for supplying water into the drum 21, and an adhesive charging means 23 for charging an adhesive into the drum 21. And The drum 21 is in a horizontal state where the center line is horizontal,
2 is connected to the lower end at the center of the outer periphery, and at the center of the bottom is provided a discharge port 25 which is opened and closed by a valve 24.

As shown in FIGS. 3 and 4, four main mixing fins 26 are provided on a rotating shaft 27 arranged on the center line of the drum 21.
Swirl and stir within. The sub mixing fin 28 is configured as a balseater-shaped rotor, and the discharge port 25 in the drum 21 is
It is provided at two nearby locations. The water injection means 22 is provided near the connection port of the drum 21 with the measuring duct 12 and supplies a small amount of water into the drum 21. The adhesive charging means 23 is provided below the water pouring means 22. The adhesive 29 such as starch, gluten, vegetable protein or the like is rotated by a coil spring-shaped feeding member 30 as shown in FIG.
Supply within 1.

The adhesive 29 is added to a certain amount of the finely-divided waste paper that has been introduced into the drum 21 from the measuring duct 12 and is stirred and mixed by the main mixing fins 26 and the sub-mixing fins 28. A small amount of water is added and kneaded to form a fluid mixture. The water added here is only for providing the adhesive 29 with fluidity to form a fluid mixture, and is a very small amount.
By opening the valve 24 at the discharge port 25 of the drum 21, the mixture imparted with fluidity is introduced into the supply device 3 for feeding the mixture to the base of the screw 32 of the injection molding machine 31 shown in FIG. The supply device 3 has a supply port 34 provided with a rotating supply screw 33.
By the rotation of 3, an appropriate amount of the mixture is fed from the supply port 34 to the base of the screw 32 of the injection molding machine 31.

The mixture introduced into the base of the screw 32 of the injection molding machine 31 is re-kneaded by the screw 32 and is accumulated at the front of the screw 32 while being compressed. The heat generated during compression is generated by the cooling barrel 3 set in the screw 32.
It is suppressed by 5. By injecting the mixture accumulated at the front of the screw 32 into the cavity in the mold 37 heated by the heater 36 under high pressure, the injection molded product such as a flowerpot made of used paper and a cushioning material for packing is almost continuously formed. Can be formed. As described above, according to the paper forming apparatus, the mixture is sent to the injection molding machine 31 through a closed path having no open portion in the middle, and the injection molding machine 31 produces the injection molded product almost continuously. Since the air path for conveying fine and fine used paper is also a closed loop, paper dust and the like are not scattered to the outside, so that the working environment can be well preserved.

As the adhesive 29, food starch or the like, which is not a synthetic substance but a substance existing in nature, is suitable from the viewpoint of environmental problems, and can be given fluidity by mixing with a small amount of water. By sintering with the heat of 37, the mold release strength of the injection molded product can be increased. The water added by the mixing device 2 is a functional material that imparts fluidity to the starch as the adhesive 29 and obtains a fluid mixture by kneading with finely-divided waste paper. At the time of sintering by the heat of the mold 37, most of the water in the injection molded product has evaporated to the atmosphere and escaped. If it is desired to release the moisture in the injection molded product more accurately, after filling the cavity, the mold 37 may be slightly opened to evaporate the residual moisture from the parting line. Is unnecessary. Further, since the molded material is injected into the mold 37 and molded, a molded product having a very high molded shape can be obtained, and packaging materials such as industrial products can be easily molded.

That is, in this paper forming and processing apparatus, an injection molding machine 31 is obtained by pulverizing and pulverizing paper and kneading the pulverized paper and the adhesive 29 by adding a very small amount of water to make them flowable. Into the screw 32, re-kneaded and then injection molded,
This is an apparatus that effectively implements a paper forming method for solidifying in a mold 37. The paper forming method to be performed is characterized by using as little water as possible, and can be said to be a dry forming method in that sense. With the paper forming apparatus, a great effect is obtained that wastewater is not generated, heat energy consumption is small, and the precision of the formed shape can be maintained high.

[0020]

According to the present invention, it is possible to solve the problem of wastewater treatment by minimizing the use of water, to reduce the consumption of heat energy, to maintain high precision of the molded shape, and to improve the working environment. Can be promoted.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating a configuration of a paper forming and processing apparatus.

FIG. 2 is a partial configuration diagram showing a portion A in FIG. 1 in detail.

FIG. 3 is a partial configuration diagram showing a portion B in FIG. 1 in detail.

FIG. 4 is a side view of the mixing device of FIG.

FIG. 5 is a configuration diagram showing an adhesive charging means of the mixing device of FIG. 3;

FIG. 6 is a partial configuration diagram showing a portion C in FIG. 1 in detail.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 crushing device 2 mixing device 3 supply device 9 blower 10 air path 11 cyclone 13 return air path 14 dust collection device 15 dust collection filter 22 water injection means 23 additive input means 29 adhesive 31 injection molding machine 32 screw 33 supply screw 37 gold Type

Claims (3)

[Claims] Claims: 1. A paper is pulverized into fine particles, and the finely divided paper and an adhesive are fed into a screw of an injection molding machine in a state of having fluidity by adding a small amount of water and kneading the mixture. A paper forming method characterized by re-kneading, injection molding, and solidifying in a mold. 2. A crushing device for crushing paper to be charged, and a mixing device for kneading the paper crushed and refined by the crushing device and an adhesive by adding a small amount of water to have fluidity, The mixture is communicated from the pulverizing device side to the mixing device side through an air passage capable of blowing air, and the mixture of the paper and the adhesive fluidized by the supply device connected to the mixing device is directly supplied to the injection molding machine. Paper processing machine configured in. 3. The paper forming and processing apparatus according to claim 2, wherein a cyclone is provided immediately before the mixing device, the cyclone being connected to an air path to separate the finely divided paper from air, and the cyclone is connected via the cyclone. And a mixing device, wherein the cyclone and the suction side of the blowing means are connected by a return air path, and a dust collecting filter is provided upstream of the return means in the return air path.