JPH0665900A - Production of formed article produced by paper-making process - Google Patents

Abstract

PURPOSE:To provide a process for producing a vessel formed by a paper-making process by effectively drying a water-containing article formed by a paper-making process. CONSTITUTION:The forming machine to be used in the paper making process has a forming mechanism 3 and a hot-pressing mechanism 4. The forming mechanism 3 is composed of an upper mold 5 and a forming lower mold 6 each having specific form and has an action to screen the pulp component from a pulp raw material slurry 18 and remove water from the pulp component. The hot- pressing mechanism 4 is composed of an upper press mold 9 and a lower press mold 10 and has an action to press the water-containing formed vessel 16 under heating to obtain the dried product. A plurality of the forming machines are used in this paper making process. High-frequency radiation is applied to the vessel 16 under forming according to the production period of the vessel-forming process of each forming machine.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a papermaking molded article.

[0002]

2. Description of the Related Art In recent years, foamed synthetic resin materials, paper products made from pulp raw material liquid into a predetermined shape, and the like have been used for packaging home electric appliances, precision instruments, foods, and the like. . Of these, those made from pulp are mainly used as containers for packaging small electric products and foods such as eggs.

Conventionally, as a method for producing a papermaking molded product, for example, a pulping component in a pulp raw material liquid is molded into a predetermined container shape in a papermaking molding mechanism of a papermaking molding machine equipped with a papermaking molding mechanism and a heating press mechanism. After the paper is simply taken out on the papermaking net, it is dehydrated to form a hydrous shaped article having a predetermined shape, and then the hydrous shaped article is hot-pressed and dried in a heating press mechanism. It was

[0004]

In order to manufacture a papermaking molded article by a conventional method, the water-containing papermaking molded article is pressed by a heating die from above and below in a heating press mechanism of a papermaking apparatus and heated and dried. However, the time required to sufficiently dry the hydrous paper-formed product by performing hot pressing by the hot-press mechanism is much longer than the time for obtaining the hydrous paper-formed product in the paper making mechanism, and is considerably long. It took time. This is because when the heating press is started, the water-containing paper molded product is gradually thinned due to the evaporation of water, and the contact between the water-containing paper molded product and the heating press die is poor, and the subsequent drying is difficult to proceed. This is because

Therefore, in the conventional manufacturing method, it is possible to continuously and efficiently manufacture a paper-formed product without interrupting the paper-making process or the like while hot pressing the hydrous paper-formed product. For the purpose, when a new water-containing papermaking molded product made by the paper making mechanism is sent to the first hot press mechanism by the hot press mechanism provided in series, the first heat press mechanism is used until then. The undried water-containing papermaking molded article that has been hot-pressed in the mechanism is transferred to the second hot-pressing mechanism, the hot-pressing is continued in the second hot-pressing mechanism, and this operation is performed in series. The method of sequentially transferring the water-containing papermaking molded article to the hot press mechanism of No. 2 was adopted.

However, when the water-containing papermaking molded product is dried by a plurality of hot-pressing mechanisms, a press die to be used in each heat-pressing mechanism must be prepared, and the water-containing papermaking molded product is supplied to each heat-pressing mechanism. A large number of transfer mechanisms are required to transfer the heat-pressing mechanism, and as a result, not only the cost of the apparatus increases, but also the manufacturing cost increases. Further, in this method, since the hot pressing step is performed plural times, it is not possible to significantly reduce the time until the final drying.

The present invention has been made in view of the above points,
An object of the present invention is to provide a method for producing a paper-formed molded product, which can effectively dry a hydrous paper-formed molded product to produce a paper-formed molded product.

[0008]

The papermaking molded article manufacturing apparatus of the present invention is a method for manufacturing papermaking molded articles in parallel by a papermaking molding machine provided with a plurality of machines. It is characterized in that the phase of the manufacturing cycle of the machine for manufacturing the paper-molded product is shifted, and a high frequency is applied to each paper-molding machine according to the phase of the shifted manufacturing cycle.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a conceptual diagram showing an example of a manufacturing apparatus according to an embodiment of a method for manufacturing a paper-formed molded product of the present invention, and FIGS.
[Fig. 3] is a schematic view showing each step of the method for producing a paper-formed molded product of the present invention.

As shown in FIG. 1, a manufacturing apparatus 1 used in the method for manufacturing a papermaking and molding product of the present invention comprises a papermaking and molding machine A and a papermaking and molding machine B, and a high frequency oscillator 2 connected to both. Has been done. As shown in FIG. 2, each papermaking and molding machine comprises a papermaking molding mechanism 3 and a heating press mechanism 4, and the papermaking molding mechanism 3 is held by an upper die 5 held by a support frame 7 and a support frame 8. Papermaking molding lower mold 6, a papermaking tank 11 provided below the lower mold 6 for storing a pulp raw material liquid 18,
And a lifter 12 for moving the lower mold 6 up and down. The lower mold 6, which can be moved up and down by the lifter 12, is immersed in the pulp raw material liquid 18 when descending, and is exposed on the pulp raw material liquid 18 when rising. Has been done. A large number of through-holes are formed on the wall surface and the bottom surface of the lower mold 6 so that the moisture in the pulp raw material liquid 18 can be efficiently permeated but the pulp component is difficult to permeate. In addition, if necessary, the lower mold 6 is placed on the lower mold 6.
It is preferable to mount a water-permeable papermaking net having a shape substantially matching the surface shape of the above.

The heating press mechanism 4 is configured to reciprocate between a press upper die 9 which is vertically movable, and a lower position of the upper die 9 and a lower position of the upper die 5 in the paper making mechanism 3. It consists of a lower press die 10. In the example shown in the drawing, the lower mold 10 is provided on a carrier table 13 connected to a stretchable cylinder 14, and the carrier table 13 is provided with a rail 15 according to the extension and contraction of the cylinder 14.
You can move back and forth. Incidentally, 19 is a carrier 13.
It is a conveyor for transporting products, which is configured to reciprocate according to the reciprocating movement of the product.

In order to produce a papermaking molded article by the method of the present invention, of the two papermaking molding machines A and B arranged in parallel,
In the papermaking dewatering step performed in the papermaking molding mechanism 3 of one of the papermaking and molding machines A, first, as shown in FIG.
Is operated to lower the papermaking molding lower mold 6, and the entire papermaking molding lower mold 6 is immersed in the pulp raw material liquid 18. At this time, vacuum suction is performed from below the lower mold 6 as needed. Then, FIG.
As shown in (1), the lower mold 6 is raised to a position above the surface of the pulp raw material liquid 18 by the elevator 12, and the upper mold 5 is lowered to press the upper mold 5 and the lower mold 6 together. Further, if necessary, vacuum suction is performed from below the lower mold 6 and / or pneumatic pressure is applied from the upper surface side of the upper mold 5.

As a result, most of the moisture contained in the pulp component taken out on the lower mold 6 flows out of the support frame 8 through the through holes of the lower mold 6, and the moisture remains on the lower mold 6. The contained pulp component is taken out and left, and a hydrous papermaking molded product 16 having the shape of the lower mold 6 is formed. The amount of the pulp component to be drawn on the lower mold 6 can be adjusted by the fiber concentration in the pulp raw material, the vacuum suction time that is performed as necessary when the paper is taken into the lower mold 6, and the like.

The pulp raw material liquid 18 may be a conventionally known pulp raw material liquid, or one obtained by adding various additives thereto. It should be noted that the pulp raw material liquid 18 may be a recycled pulp raw material liquid using recovered paper, which may occupy all or some of the components.

In this way, the pulp component in the pulp raw material liquid 18 is made on the lower mold 6 and pressed by the upper mold 5 from the upper surface side,
Further, if necessary, the lower surface side of the lower mold is depressurized to dehydrate the water. The water-containing papermaking molded product 16 having a predetermined container shape obtained by the trowel has a water content of about 30 to 70% by weight.
When the lower surface side of the lower mold 6 is decompressed as needed, the decompression condition is preferably about 700 to 10 mmHg.

A high frequency is applied to the water-containing papermaking molded product 16 obtained in the papermaking dehydration step in the high frequency application step. In the present invention, in the molding machine A and the molding machine B, for example, the papermaking dehydration step is performed in the papermaking molding machine B while the high-frequency applying step is performed in the papermaking molding machine A. Do it staggered.

In the papermaking and molding machine A, after the papermaking dehydration step is completed, the obtained water-containing papermaking and molded product 16 is vacuum-sucked from above the upper mold 5 and is pressurized and pressurized from the lower mold 6 to the upper mold. 5 and raised together with the upper mold 5. On the other hand, the lower papermaking mold 6 is lowered again and dipped in the pulp raw material liquid 18 to carry out the next papermaking and the cylinder 1
4 is advanced (Fig. 4). The transfer table 13 moves on the rail 15 by the movement of the cylinder 14, and the press lower mold 1
0 is transferred to the lower position of the upper mold 5. Press lower mold 10
Is transferred to a position below the upper mold 5, the upper mold 5 is subsequently lowered, the upper mold 5 and the press lower mold 10 are clamped, and a high frequency is applied between them to form the hydrous papermaking molded product 16 Is dried (FIG. 5). On the other hand, in the molding machine B, as in the case of the molding machine A described above, the lower mold 6 and the upper mold 5 dehydrate the water contained in the pulp component made on the lower mold 6.

In the high frequency applying step, it is preferable that the lower surface of the press lower die 10 is depressurized by suction and the upper surface of the upper die 5 is pressurized and pressurized. When the water content in the container is preferably about 15 to 35% by weight, suction is preferably performed from the press lower mold 10 and the upper mold 5 is raised while being pressurized and air-pressurized from the upper mold 5 to form a water-containing paper-molded product 16. It is transferred and held on the lower press mold 10. Next, the cylinder 14 is retracted, and the carrier 1
3 is pulled back to the lower position of the upper press die 9 (FIG. 6), and when the carrier 13 is pulled back to the lower position of the upper press die 9, the heating press mechanism 4 performs hot pressing. In the hot pressing step, the press upper mold 9 is lowered, and the hydrous papermaking molded product 16 is hot pressed by the upper mold 9 and the press lower mold 10 (FIG. 7). At this time, preferably the press lower mold 10
The pressure is sucked and depressurized from the lower surface side, and the air is pressurized and pressurized from the upper surface side of the upper press die 9. During this period, the water-containing papermaking molded product 16 obtained in the papermaking dehydration step of the other papermaking molding machine B is transferred to the high-frequency applying step to be the water-containing papermaking molded product 16 obtained in the papermaking dehydration step of the papermaking molding machine B. Apply high frequency.

As a method of performing high frequency application between the upper die 5 and the lower press die 10 by alternately switching the output direction of the high frequency between the molding machine A and the molding machine B, for example, a high frequency oscillator 2
Is provided with two pairs of high-frequency output electrodes, and one electrode (for example, an anode) of each high-frequency output electrode pair is connected to each of the papermaking machines A and B.
Always connected to the upper mold 5 in the papermaking mechanism 3 of FIG. On the other hand, the other electrode (for example, the cathode) is brought into contact with the lower die 10 when the lower die 10 of the heating press mechanism 4 is located below the upper die 5, or for each high frequency output. A switcher capable of switching the high frequency output to the electrode pair is provided, and is connected to the lower press die 10 via the switcher. The high frequency oscillator 2 has an oscillation frequency of 10 ³ Hz to 10 ¹³ Hz, preferably 10 ⁶ Hz to 1
It is preferably 0 ¹² Hz, more preferably 10 ⁷ Hz to 10 ⁸ Hz, and the output is preferably about 1 kw to 100 kw.

During hot pressing in the hot press mechanism 4 of the molding machine A, for example, as shown in FIG.
In the papermaking and molding mechanism 3 of 1., the papermaking molding lower mold 6 is raised and the upper mold 5 is lowered, and the upper mold 5 and the lower mold 6 are aligned and pressed to remove the pulp component scraped on the lower mold. By dehydration, the following hydrous papermaking molded product is formed.

In the hot pressing step, the temperature at which the hydrous papermaking molded article 16 is hot pressed is 50 to 400 ° C.
The pressing force is preferably 1 to 10 kg / cm ² · G. By performing hot pressing in the hot press mechanism, it is possible to make the traces of holes and the traces of the net on the surface of the hydrous papermaking molded article inconspicuous.

After the hot pressing step is completed, the papermaking molded article 17 obtained as shown in FIG. On the other hand, the lower press die 10 is again transferred to the lower side of the upper die 5 and a high frequency is applied to a new hydrous papermaking molded article 16 by the upper die 5 and the lower press die 10,
During this time, the papermaking molded product 18 held by the press upper mold 9 is transferred to the conveyor 19 and carried out (FIG. 9). At this time, in the other papermaking and molding machine B, the water-containing papermaking and molded product 16 that has undergone the high-frequency applying step is transferred to the hot pressing step in the same manner as described above, and after the heating and pressing step is finished, the obtained container is similarly processed. And is conveyed by the conveyor 19. In this way, the papermaking molding machine A and the papermaking molding machine B alternately manufacture the papermaking moldings 17. In the method of the present invention, the number of papermaking and molding machines is not limited to two, and a papermaking and molding product can also be manufactured by three or more papermaking and molding machines provided by shifting the phase of the manufacturing process cycle.

In the above example, the high frequency applying step was performed before the hot pressing step, but the high frequency applying step can be performed not only before the hot pressing step but also simultaneously with the hot pressing step. Further, high frequency application can be performed in at least one of the papermaking dehydration step and the heat pressing step. When a high frequency is applied in the papermaking dehydration step, the upper mold 5 and the lower papermaking mold are pressed while the upper mold 5 and the lower papermaking mold 6 are aligned with each other for the electrodes of the high-frequency transmitter 2. It should be provided so as to be connected to 6,
When a high frequency is applied in the hot pressing step, the upper press die 9 and the lower press die 10 are pressed while the electrode is heating and pressing the hydrous papermaking molded article 16 by the upper press die 9 and the lower press die 10. It may be provided so as to be connected. Also,
When high frequency is applied in both steps, high frequency applying means may be provided in both the paper making mechanism 3 and the heating press mechanism 4.

[0024]

As described above, according to the method for manufacturing a paper-molded product of the present invention, residual water in the paper-molded product can be dried in a short time, and uniform drying can be performed. . For this reason, it is possible to simplify the multi-step hot pressing process as in the conventional method and the container transfer means to each hot pressing process, and it is possible to reduce the size and cost of the apparatus.
Further, the production method of the present invention is a method for producing a paper-formed product in parallel by a paper-forming machine provided with a plurality of groups,
Compare the number of expensive high-frequency oscillators to the number of molding machines because the phase of the manufacturing cycle of the paper-molded product manufacturing process of each paper-molding machine is shifted, and high-frequency application is performed according to the shifted phase of the manufacturing cycle. In addition to being able to reduce the number, it is possible to significantly reduce the stop time of the high-frequency oscillator, and as a result, it is possible to produce a paper-formed product with high production efficiency.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a manufacturing apparatus used in a method for manufacturing a paper-formed molded product of the present invention.

FIG. 2 is a schematic view showing one step of a method for producing a paper-formed molded product of the present invention.

FIG. 3 is a schematic view showing one step of a method for producing a paper-formed molded product of the present invention.

FIG. 4 is a schematic view showing one step of the method for producing a paper-formed molded product of the present invention.

FIG. 5 is a schematic view showing one step of a method for producing a paper-formed molded product of the present invention.

FIG. 6 is a schematic view showing one step of a method for producing a paper-formed molded product of the present invention.

FIG. 7 is a schematic view showing one step of a method for producing a paper-formed molded product of the present invention.

FIG. 8 is a schematic view showing one step of a method for producing a paper-formed molded product of the present invention.

FIG. 9 is a schematic view showing one step of a method for producing a paper-formed molded product of the present invention.

[Explanation of symbols]

 A Paper making machine B Paper making machine 2 High frequency oscillator 17 Paper making product

Claims (1)

[Claims] 1. A method for producing a papermaking molded article in parallel using a papermaking molding machine provided with a plurality of bases, wherein the manufacturing cycle of the papermaking molded article manufacturing process of each papermaking molding machine is shifted. A method for producing a paper-formed product, characterized by applying a high frequency to each paper-making machine according to the shifted phase of the production cycle.