WO2003035981A1

WO2003035981A1 - Method of producing paper-making-processed molded articles, and heating press device

Info

Publication number: WO2003035981A1
Application number: PCT/JP2002/011065
Authority: WO
Inventors: Kohro Utsui; Yorio Hashimoto
Original assignee: Utsui Co., Ltd.
Priority date: 2001-10-24
Filing date: 2002-10-24
Publication date: 2003-05-01
Also published as: JP4099147B2; JPWO2003035981A1; JPWO2003035980A1; JP4099146B2; WO2003035980A1

Abstract

A method of producing paper-making-processed molded articles such as those used as packaging containers and packaging shock absorbers; and a heating press device used for the production of the same. A water-containing paper-making-processed molded article (12) is held between an upper press mold (4a) and a lower press mold (5a) and subjected to heating press, whereupon the lower press mold (5a) is lowered while leaving a slight clearance between the upper and lower press molds (4a, 5a). Hot air is blown from the upper press mold (4a) and the lower press mold (5a) is evacuated. The hot air blowing and the evacuation are alternately repetitively effected between the upper and lower press molds (4a, 5a), and the water-containing paper-making-processed molded article (12) is vertically swung.

Description

Description ^ Method for manufacturing paper-formed article and heating press

TECHNICAL FIELD The present invention relates to a method for producing a molded article formed from pulp raw material and used as a packaging container, a packaging cushioning material, and the like, and a heating press used for the production. Background art

In recent years, as a packaging container for small electric appliances, precision machinery, or a package for food such as eggs, a molded article formed into a predetermined shape using a pulp raw material liquid has been used. Its use is widespread as suitable for

As a general method for producing the above-mentioned molded article, a raw material such as pulp is dispersed in water, and the pulp component in the dispersion liquid is collected using a predetermined shape paper-making net. After dewatering by vacuum suction, a method of heating and drying a hydrated paper-formed product formed into a predetermined shape through a hot-air drying furnace to obtain a final product has been widely used.

However, in this method, since the formed paper product containing water is heated and dried in a hot-air drying oven, the thickness of the final product obtained is not uniform, and the formed product is distorted when heated and dried. There was a drawback that the shape and dimensions fluctuated. Another problem is that a mesh pattern is formed on the surface of the molded product on the side in contact with the papermaking net during papermaking, and that irregularities are formed on the other surface. Although the press treatment in the above could flatten to some extent, it was not sufficient and a smooth surface could not be obtained. Furthermore, the hot-air drying oven is a large-sized device whose length from the inlet to the outlet is very long, so there is a disadvantage that the installation area of the device is large and the manufacturing cost is increased.

Japanese Patent Application Laid-Open No. 6-49800 discloses that a papermaking lower mold is immersed in a pulp raw material liquid to form a water-containing paperwork on the lower mold. Pressing and dewatering between the mold and dewatering, then holding the hydrated papermaking molded article in the upper mold, lowering the lower mold, and moving the heating press lower mold waiting at another position to move the hydrated papermaking The hot press lower mold is positioned below the upper mold holding the molded product, high-frequency drying is performed by sandwiching the wet papermaking molded product between the upper mold and the hot press lower mold, and then the hot press lower mold is wetted. The holding press lower mold is moved while holding the molded article, and is positioned below the holding press upper mold waiting at another position. Then, hot press is performed with the hydrated paper-molded product sandwiched between them, and it is now possible to obtain the final molded product. It is shown.

Japanese Patent Application Laid-Open No. 6-690000 discloses a method for producing a molded article similar to the above-mentioned Japanese Patent Application Laid-Open No. 6-49800, and a plurality of paper molding machines are provided. It discloses a manufacturing method in which the phase of the production cycle of a molded article is shifted, and a high frequency is applied to each papermaking molding machine in accordance with the phase of the shifted production cycle. Similarly, in Japanese Patent Application Laid-Open No. 6-15859-99, when a wet-formed paper-formed product is dried and formed, a hot-pressed paper-formed product is sandwiched between a press upper die and a press lower die, and heated and pressed. Is disclosed.

According to these JP-A-6-49800, JP-A-6-690000 and JP-A-6-158959, water is contained between the upper press die and the lower press die. Since the molded paper is sandwiched and pressed and heated and dried, it is possible to produce a molded molded article having a uniform thickness, excellent dimensional accuracy, and a smooth surface and good appearance. Also, like a hot air drying oven There is no need to install a large large device, and the manufacturing cost can be reduced.

However, none of the above-mentioned prior arts discloses a technical means for efficiently heating and drying a hydrated papermaking molded article.

In addition, in general, a molded article is a molded article having a complicated shape, a molded article having an unbalanced shape, a molded article having a small draft angle, or a pulp component which is easily adhered to a mold. When the molded product is removed from the mold, or when the molded product is made of a pulp component containing a chemical or the like that easily seizes into the mold, the mold should be released smoothly. However, there is a problem that it is difficult to remove the molded product. None of the above-mentioned prior arts is directed to solving such a problem at the time of removing a molded article, and there is no disclosure of a solution thereto.

特開 Japanese Patent Application Laid-Open No. 2000-34070 describes that a wet-formed paper-formed product formed on the surface of a paper-making mold is transferred to a take-up die supported by a swing arm, and the rotary arm is rotated to produce a wet-formed paper-formed product. Transfer to the lower mold supported by the rotary table, sandwich the hydrous paper-formed product between the upper and lower dies, and dry while heating and pressurizing the hydrous paper-formed product while the rotary table rotates tact. It is disclosed.

Japanese Patent Application Laid-Open No. 2000-340700 discloses that a water-containing papermaking molded article is sandwiched between an upper mold and a lower mold and heated and dried. No means is disclosed, nor is there any disclosure of facilitating mold release of molded products.

An object of the present invention is to provide a method for producing a paper-formed article which can be efficiently heated and dried in the step of drying and forming a water-containing paper-formed article. Another object of the present invention is to provide a method for producing a sheet-like molded product that can easily remove a molded product from a mold in a molded product removal step. Further, the present invention enables efficient heating and drying of a hydrated paper molded article and It is an object of the present invention to provide a heating press device capable of facilitating product release. Disclosure of the invention

In the present invention, a papermaking mold is immersed in a pulp raw material liquid, a pulp component is removed to form a water-containing papermaking product on the papermaking die, and the water-containing papermaking product is sandwiched between a papermaking die and an upper press die. This is a method for producing a sheet-shaped molded article by producing a sheet-shaped molded article by dehydrating and drying to produce a sheet-shaped molded article, sandwiching the sheet-shaped hydrated article between an upper press die and a lower press die, and drying by heating.

In the heating and drying step, after the hydrated papermaking molded product is heated and pressed between the upper press die and the lower press, the upper press die and the lower press die are separated to provide an interval where the hydrated papermaking molded product can move up and down. . It is not necessary to set a large separation distance between the two press dies, and it is only necessary to provide a small interval at which the hydrated papermaking molded product can move up and down. After the two press dies are separated from each other, compressed air is blown from one of the upper press die and the lower press die to the hydrated paper-formed product, and the other press die is evacuated to the hydrated paper-formed product by vacuum. And the vacuum suction are alternately switched between the upper press die and the lower press die, whereby the hydrated paper-formed product is swung up and down between the two press dies.

In an embodiment of the present invention, heated compressed air is blown from the upper press mold to the hydrated paper-formed product, and the hydrated paper-formed product is sucked into the lower press die by vacuum suction in the lower press die. Then, the heated pressurized air is blown from the lower press die onto the hydrated paper-formed product, and the hydrated paper-formed product is sucked in vacuum in the upper press die, and the hydrated paper-formed product is suction-held in the upper press die. Thereafter, the suction holding of the hydrated papermaking molded article in the lower press mold and the suction holding in the upper press mold are alternately and repeatedly performed. As a result, the hydrated papermaking molded product is swung up and down between both press dies. According to the present invention, in a drying process of a hydrated papermaking molded article, after performing a hot press using an upper press die and a lower press die, the two press dies are separated by a predetermined distance, and the hot air is blown and vacuum sucked by the both press dies. Since the hydrated papermaking molded product is swung up and down repeatedly, the drying of the hydrated papermaking molded product is further promoted by blowing heated air from the mold surface. When the press-molds are separated from each other and the hydrated paper-formed product is swung up and down, air is diffused and the water vapor remaining on the surface of the hydrated paper-formed product is dissipated. Drying of the shape is promoted.

Therefore, according to the present invention, it is possible to efficiently heat-dry a hydrated paper-made molded product, and to perform sufficient drying in a short time. As a result, the present invention can contribute to improvement of production efficiency.

In addition, in the present invention, since the water-containing paper-made molded product is swung up and down between the upper press die and the lower press die, the releasability is improved, and the removal of the final molded product from the mold is performed smoothly and easily. be able to. Therefore, the molded article is a complex shaped article, a molded article with an unbalanced shape, a molded article with a small draft angle, a molded article made of pulp components that easily adheres to the mold, or easily sticks to the mold It is possible to easily release a molded product even if it has a mold release inhibiting factor, such as a molded product made of a pulp component to which a chemical or the like is added. As a result, there is no danger that a part of the molded product will be damaged due to excessive force applied to the molded product when the molded product is taken out.

Further, the present invention is a heating press apparatus for producing a paper-formed product by hot-pressing a water-containing paper-formed product between a press die disposed at an upper portion and a press die disposed at a lower portion. The heating press device of the present invention is provided with a plurality of passages inside the press die, one end of which is opened on the surface of the press die, and the other of the passages. The end is communicated with the compressed air passage and the vacuum passage.

In a preferred embodiment of the present invention, the press die is supported and fixed to a base, and the above-described compressed air passage and vacuum passage are provided in the base, and a heater is embedded therein.

By configuring the heating press device as described above, heated compressed air can be blown out from the mold surfaces of the upper press mold and the lower press mold, and a vacuum suction action can be performed from the mold surfaces. By this air blowing operation and the vacuum suction operation, it is possible to cause the water-containing paper-molded product to swing up and down between the two press dies.

Here, the heated compressed air is blown out from the mold surface of the press die, so that a fixed amount of compressed air can be uniformly supplied, and the compressed air can be sprayed uniformly on the hydrated paper molded article.

If the blowing of the compressed air is not uniform, the air pressure exerted on the hydrated paper-made molded article will be uneven, making it difficult to release the mold. However, according to the present invention, the compressed air can be sprayed uniformly, so The release of the paper-formed product is facilitated, and as a result, the up-and-down swing of the water-containing paper-formed product can be performed smoothly, and the release can be performed smoothly and easily even when the final product is removed from the mold. . BRIEF DESCRIPTION OF THE FIGURES

1 is a schematic plan view of the apparatus of the present invention, FIG. 2 is a schematic front view of the apparatus of the present invention viewed from the direction of the first dry forming zone B in FIG. 1, and FIG. 3 is a view of the second dry forming zone C in FIG. FIG. 4 is a schematic front view of the apparatus of the present invention viewed from the direction, FIG. 4 is a schematic longitudinal sectional view showing a state of matching between an upper press die and a papermaking mold, and FIG. 5 is a longitudinal section showing a state of matching between an upper press mold and a lower press mold. Fig. 6 is a schematic front view showing the paper making process, and Fig. 7 is a process of adding a hydrated paper molded product between an upper press die and a lower press die. Fig. 8a, 8b, 8c is an explanatory diagram showing the vertical swinging process of a hydrated paper-formed product, and Fig. 9 is a drawing in which the hydrated paper-formed product is sucked and held by an upper press mold. FIG. 10 is a schematic front view showing a state in which the lower press die is lowered, and FIG. 10 is a schematic front view showing a state in which a molded product is taken out of the mold. BEST MODE FOR CARRYING OUT THE INVENTION

The manufacturing apparatus 1 of the present invention includes a plurality of upper press dies 4a, 4b, 4c, and 4d supported and fixed on a rotatable support 3, and these upper press dies 4a, 4b, 4c, and 4d. The lower press dies 5a, 5b, and 5c for hot-pressing the hydrated paper-molded article between the sheet-forming mold and the paper-making mold 2 for performing paper-making molding.

The support 3 is supported by the rotation shaft 31 and is configured to rotate with the rotation shaft 31. The support 3 has an arm branched in four directions from the center, and upper press dies 4a, 4b, 4c, and 4d are fixed to the ends of the arms. The upper press dies 4 a, 4 b, 4 c, 4 d are supported and fixed to the lower surface of the base 45 by means of screws or the like, and the base 45 is fixed to the support 3. The upper press dies 4a, 4b, 4c, and 4d are supported by a rotatable support 3 so as to be movable in the circumferential direction. The configuration of the support 3 is not limited to an arm shape, and may be a disk-shaped rotary table.

Reference numeral 9 denotes a driving device for driving the rotating shaft 31 to rotate. The driving device 9 is controlled by the control device 32. The control device 32 can control the rotation speed of the rotation shaft 31 and also can control the rotation angle α and the stop time in the intermittent rotation of the rotation shaft 31. An index, a servomotor, a positioning knock pin, and the like can be used as such a control device. 10 is a support frame. A paper forming zone A and a plurality of dry forming zones B, C, D are provided in a process in which the upper press dies 4a, 4b, 4c, 4d move in the circumferential direction (FIG. 1). A papermaking tank 7 having a papermaking mold 2 installed therein is disposed in the papermaking molding zone A, and a lower part is provided in each of the first drying molding zone B, the second drying molding zone C, and the third drying molding zone D. Press dies 5a, 5b and 5c are arranged. In Figs. 2 and 3, below the upper press dies 4a, 4b, 4c and 4d, the papermaking die 2 and the lower press dies 5a, 5b and 5c are opposed to the upper press dies, respectively. So that they are arranged along the circumferential direction.

In FIG. 2, the papermaking mold 2 is arranged below the upper press mold 4a. A cylinder 33 is provided inside the paper tank 7, and a base 42 is attached to an upper end of a shaft 13 provided so as to be able to move up and down by the cylinder 133. A papermaking mold 2 is supported and fixed on the upper surface of the papermaking machine by a fixing tool such as a screw. Thus, the shaft 13 is moved up and down by the action of the cylinder 13 3, whereby the papermaking mold 2 is configured to be movable in the up and down direction.

A predetermined amount of pulp raw material liquid 8, which is a molding material for a papermaking molded article, is put in a papermaking tank 7. As the pulp raw material liquid 8, a known pulp raw material liquid in which pulp raw material is dispersed in water is used. be able to. The pulp raw material may be a virgin raw material mixed with recycled paper raw material such as waste paper, or a pulp raw material liquid may be prepared from only recycled paper raw material. In addition, a pulp raw material may be mixed with a water-soluble polymer, a thermoplastic synthetic resin or fiber which is melted by heat generated during hot pressing. In FIG. 2, a lower press die 5 a located below the upper press die 4 b is supported and fixed on a top surface of a base 50 by a fixing tool such as a screw, and the base 50 is a cylinder mounted on a base 14. It is attached to the upper end of a shaft 49 that can be moved up and down by one. In the same figure, the lower press die 5b located below the upper press die 4c and the lower press die 4d in FIG. Similarly, the lower press dies 5c, which are located on the base 50, are also supported and fixed to the upper surface of the base 50 by screws or other fasteners. 9 is attached.

As described above, the lower press dies 5a, 5b, and 5c are configured to be vertically movable by the action of the cylinder 134.

The lower press dies 5a, 5b, and 5c can be moved up and down by the cylinder 134, but are not moved in the circumferential direction and are fixed. It is preferable to use a hydraulic cylinder as the cylinders 33, 34 in the papermaking mold 2 and the lower press molds 5a, 5b, 5c.

In the third dry molding zone D, a molded article receiving device 36 is provided near the installation location of the upper mold and the lower mold. As shown in FIG. 3, the apparatus 36 is provided with a receiving table 35 that is freely slidable in the horizontal direction. The upper die holding the paper-formed product after the pressurizing and heating treatment is completed. The receiving table 35 is moved downward, and the molded article discharged from the upper mold by blowing compressed air is received and moved backward, and when it returns to the original position or while moving backward. The receiving table 35 has a mechanism for tilting and dropping the formed paper product downward.

As shown in FIG. 4, a plurality of passages 6 are provided inside an upper press die 4a supported and fixed to a lower surface of a base 45. Each of the plurality of passages 6 has an opening on the surface of the mold, and a member 25 having a fine hole formed at the opening end is embedded therein. As the member 25, it is preferable to use a bottomed cylindrical core vent having a fine hole forming surface on one opening end side. The member 25 is attached such that the micropore forming surface is located on the opening end side of the mold surface of the passage 6. The fine holes provided in the member 25 may be circular or slit-shaped. In the case of a circular hole, the hole diameter is preferably 0.5 to 2.0 OIM. In this case, the slit width is preferably 0.5 to 2.0 mm. If the pore diameter and the slit width are less than 0.5, clogging may occur, which may impede the moisture permeation of the hydrated paper-molded article. There is a risk that components will permeate through the pores.

The plurality of passages 6 merge at the upper part of the mold, and the merge portion communicates with a communication passage 15 provided inside the base 45.

Inside the base 45, a vacuum passage 46 and a compressed air passage 47 are provided in communication with the communication passage 15. Both the vacuum passage 46 and the compressed air passage 47 are provided horizontally in the base 45, and the vacuum passage 46 is connected to a vacuum suction device such as a vacuum pump (not shown). The passage 47 is connected to a compressed air supply device such as a compressor (not shown). The pressure in the vacuum passage 46, the communication passage 15 and the passage 6 can be reduced by the function of the vacuum pump, and the compressed air is supplied to the compressed air passage 47 by the function of the compressor. It can be blown out of the mold surface through passage 15, passage 6, and member 25.

The vacuum passage 46 and the compressed air passage 47 may be formed as vertical passages communicating with the communication passage 15 in the base 45. Further, this vertical passage may be constituted by two passages divided into a vacuum passage 46 and a compressed air passage 47, or the vacuum passage 46 and the compressed air passage 47 may be constituted as one passage. In the latter case, the pressure can be reduced through a single passage or compressed air can be supplied. A predetermined number of heaters 22 as heating devices are embedded in the base 45.

Each of the upper press dies 4b, 4c, and 4d has the same structure as the above-described upper press dies 4a.

On the other hand, as shown in FIG. 4, the papermaking mold 2 has a mold body 19, a support member 21 and a mold. It consists of a papermaking net 17 attached to the surface of the main body 19, and the mold main body 19 is supported by the support member 21 and fixed to the base 42. As the net 17, a mesh having a mesh that allows moisture in the pulp raw material liquid to pass but does not allow the pulp component to pass is used, and a wire mesh of 15 to 80 mesh is usually used. Stainless steel or brass is used as the material of the wire mesh.

A plurality of passages 18 are provided inside the papermaking mold 2, and each of the plurality of passages 18 is open to the surface of the mold, so that the open end of the passage 18 communicates with the micropores of the net 17. I have. The passage 18 is a passage through which the moisture of the water-containing molded article is permeable, and is composed of a plurality of vertical passages and horizontal passages, and the vertical passages and the horizontal passages communicate at the intersection. Preferably the passage 18 has a pore diameter of 0.5 to 4.0. If the pore size is less than 0.5, it may cause clogging and impede the transmission of water through the hydrated molded article. If the pore size exceeds 4.0, the pulp component of the hydrated molded article may enter. There is a fear.

The plurality of passages 18 join at a lower portion of the mold, and the joining portion communicates with a communication passage 20 provided inside the base 42.

Inside the base 42, a vacuum passage 43 communicating with the communication passage 20 is provided horizontally, and the vacuum passage 43 is connected to a vacuum pump (not shown). The vacuum passage 43 may be configured as a vertical passage communicating with the communication passage 20 in the base 42.

FIG. 4 shows a state in which the upper press die 4a and the papermaking die 2 are matched, and reference numeral 11 denotes a clearance between the upper press die 4a and the papermaking die 2. Therefore, when the upper press mold 4a and the papermaking mold 2 are clamped, a water-containing papermaking molded article having a thickness corresponding to the clearance 11 is formed.

As shown in FIG. 5, the lower press die 5a supported and fixed on the upper surface of the base 50 has a plurality of passages 54 inside. Multiple passages 5 4 are each on the mold surface An opening 26 is formed, and a member 26 having a fine hole formed at the opening end is embedded therein. The structure of the member 26 is the same as that of the member 25 attached to the upper press die 4a, and it is preferable to use a core vent as the member 26.

The lower end of each of the plurality of passages 54 communicates with a communication passage 23 formed inside the base 50, and the inside of the base 50 communicates with the communication passage 23 to form the vacuum passage 51 and the compressed air. A passage 52 is provided. Both the vacuum passage 51 and the compressed air passage 52 are provided horizontally in the base 50, and the vacuum passage 51 is connected to a vacuum suction device such as a vacuum pump (not shown). Reference numeral 2 is connected to a compressed air supply device such as a compressor (not shown). The inside of the vacuum passage 51, the communication passage 23 and the passage 54 can be reduced in pressure by the function of the vacuum pump, and the compressed air is supplied to the compressed air passage 52 by the function of the compressor. 23, it can be blown out from the mold surface through the passage 54 and the member 26.

The vacuum passage 51 and the compressed air passage 52 may be provided in the base 50 as a vertical passage communicating with the communication passage 23. Further, the vertical passage may be constituted by two passages divided into a vacuum passage 51 and a compressed air passage 52, or the vacuum passage 51 and the compressed air passage 52 may be constituted as one passage. In the latter case, the pressure can be reduced through a single passage or compressed air can be supplied. A predetermined number of heaters 24 as heating devices are buried inside the base 50. Each of the lower press dies 5b and 5c has the same structure as the above-described lower press dies 5a.

FIG. 5 shows a state in which the upper press die 4a and the lower press die 5a are mated, and reference numeral 16 denotes a clearance between the upper press die 4a and the lower press die 5a. Therefore, the upper press die 4a and the lower press die 5a are When tightened, a water-containing paper-molded article having a thickness corresponding to the clearance 16 is formed.

The material of the mold body 19 in the papermaking mold 2, the upper press dies 4a, 4b, 4c, 4d and the lower press dies 5a, 5b, 5c is generally a metal, but an elastic material. It may be. Examples of the metal include aluminum and nickel, and examples of the elastic material include rubber, elastic synthetic resin, and synthetic resin foam. The surface of each of the upper press dies 4a, 4b, 4c, 4d and the lower press dies 5a, 5b, 5c is provided with a molded product by reducing the frictional resistance between the mold surface and the molded product. Fluororesin processing is preferred for good release during removal.

In the above embodiment, the papermaking mold 2 is configured as a convex type, the upper press dies 4a, 4b, 4c, and 4d are configured as a concave type, and the lower press dies 5a, 5b, and 5c are configured as a convex type. Although the case is shown, as another embodiment of the present invention, the papermaking mold 2 is concave, the upper press dies 4a, 4b, 4c, and 4d are convex, and the lower press dies 5a, 5b, 5c may be configured as a concave shape. -The method for producing a molded article of the present invention comprises a papermaking molding step, a drying molding step, and a molded article removal step. Papermaking is performed by the papermaking mold 2 and the upper press mold 4a arranged in the papermaking zone A. The papermaking mold 2 is immersed in the pulp raw material liquid 8 in the papermaking tank 7, and the inside of the papermaking mold 2 is depressurized by operating the vacuum pump connected to the vacuum passage 43. 2 is raised to a position above the liquid level of the pulp raw material liquid 8 (FIG. 6a). As a result, the pulp component is taken out on the net 17 of the papermaking mold 2 to form a hydrated paper 27 having a shape corresponding to the shape of the papermaking mold 2.

Since the papermaking mold 2 rises while vacuum-sucking the hydrated paper 27, the water in the hydrated paper 27 is sucked and dehydrated during the upward movement. That is, hydrated paper The water in 27 is sucked into the mold through the net 17 and guided into the passage 18. The water guided to the lower side of the mold through the passage 18 is guided to the vacuum passage 43 via the communication passage 20 and discharged to the outside of the mold through the discharge passage.

The papermaking mold 2 holding the hydrated paper 27 was held by suction, and the hydrated paper 27 was brought into contact with the upper press mold 4a and the hydrated paper 27 was pressed by the upper press mold 4a and the papermaking mold 2. The upper press die 4a and the papermaking die 2 to stop at a predetermined position based on the clearance set value.

The hydrated paper product 27 is sandwiched between the upper press mold 4a and the papermaking mold 2 and pressed (FIG. 6b), whereby the hydrated paper product 27 is pressed and shaped into the shape as it is, and a hydrated paper product 12 is obtained. Can be

In the dehydration and drying treatment by the upper press mold 4a and the papermaking mold 2, suction dehydration and heating in the upper press mold 4a are performed in addition to the suction dehydration by the papermaking mold 2 described above. By operating a vacuum pump connected to the vacuum passage 46, the inside of the upper press die 4a is depressurized, and the water in the water-containing molded article 12 is suctioned and dehydrated. That is, the water in the hydrated papermaking molded product 12 is sucked into the mold through the member 25 and guided into the passage 6. The moisture guided upward through the mold through the passage 6 is guided into the vacuum passage 46 via the communication passage 15 and discharged to the outside of the mold through the discharge passage.

Further, the upper press mold 4a is heated by the heater 22 so that the hydrated paper molded article 12 is heated and dried. The water vapor generated by the heating is discharged through the discharge passage through the member 25—passage 6—communication passage 15—vacuum passage 46 and discharged to the outside of the mold. The heating temperature of the upper press mold 4 a by the heat press 22 is preferably 100 to 250 ° C., and the vacuum degree of the upper press mold 4 a and the papermaking mold 2 when performing suction dehydration are both 70 ° C. 0-1 O mmHg is preferred.

A hydrated paper-formed product by dehydration and drying using the upper press die 4a and the papermaking die 2. The moisture content of 12 is about 30-70% by weight. After completion of the papermaking process, the papermaking mold 2 descends and separates from the upper press mold 4a, and returns to the old position in the papermaking tank 7. At this time, the hydrated papermaking molded product 12 is in a state of being suction-held by the upper press mold 4a (FIG. 6c).

Next, the driving device 9 is operated to rotate the rotation shaft 31, thereby rotating the support 3 so that the rotation angle becomes 90 °. Due to the rotation of the support 3, the upper press die 4a moves in the circumferential direction, and is displaced to a position above the lower press die 5a in the first dry forming zone B. At this time, the upper press die 4 is simultaneously displaced to a position above the lower press die 5b in the second dry molding zone C, and the upper press die 4c is displaced to a position above the lower press die 5c in the third dry molding zone D. Then, the upper press mold 4d is displaced to a position above the papermaking mold 2 in the papermaking molding zone A, and the processing in each zone is performed in synchronization.

When the upper press die 4a is displaced to a position above the lower press die 5a in the first dry forming zone B, the lower press die 5a is moved upward. The lower press mold 5a keeps ascending until it comes into contact with and presses the hydrated paper-formed molded product 12 held by the upper press mold 4a, and the upper press mold 4a and the lower press mold 5a It stops at a predetermined position based on the clearance set value between them.

The hydrated paper molded product 12 is sandwiched between the upper press die 4a and the lower press die 5a, pressed and heated and pressed (Fig. 7).

While the upper press die 4a holds and heats the hydrated papermaking molded product 12 while holding the same, the suction and heating are continued after the lower press die 5a is matched. The suction and heating mechanism by the upper press die 4a is as described with reference to FIG.

On the other hand, the lower press die 5a starts suction and heating after this die alignment. I do. FIG. 5 shows the suction mechanism and the heating mechanism in the lower press die 5a. That is, the vacuum pump connected to the vacuum passage 51 in the lower press mold 5a is operated to make the inside of the lower press mold 5a in a reduced pressure state; The water in the water-containing molded article 12 is sucked into the mold through the member 26 and guided into the passage 54. The water guided to the lower side of the mold through the passage 54 is guided to the vacuum passage 51 through the communication passage 23, and is discharged to the outside of the mold through the discharge passage.

Further, the lower press mold 5a is heated by the heater 24, whereby the hydrated paper molded article 12 is heated and dried. The water vapor generated by the heating is discharged through the core vent 26-passage 54-communication passage 23-vacuum passage 51 through the discharge passage to the outside of the mold. The heating temperature of the lower press die 5a by the heater 24 is preferably 100 ° C. to 250 ° C., and the degree of vacuum of the lower press die 5a is preferably 700 to 10 mmHg.

The heating temperature of the upper press die 4a in this dry forming step is preferably 100 to 250 ° C, and the degree of vacuum is preferably 700 to 1 OmmHg.

After the heating press by the upper press die 4a and the lower press die 5a is completed, the cylinder 34 is operated while the hydrated papermaking molded product 12 is suction-held in the upper press die 4a, and the lower press die 5a is operated. Is slightly moved downward to separate the upper press die 4a and the lower press die 5a by a predetermined distance (FIG. 8a). Next, by operating the compressor, compressed air is sent from the compressed air passage 47 of the upper press die 4a, and air is blown out of the member 25 via the communication passage 15 and the passage 6. Since the upper press mold 4a is heated by the heater 22, the air flowing in the passage 6 is also heated, and thus the heated air blows out from the upper press mold 4a. Simultaneously with the blowing of heated air by the upper press mold 4a, vacuum suction is performed from the lower press mold 5a. As a result, the hydrated paper molding 1 2 And the release from the upper press mold 4 a, is sucked and held on the lower press die 5 a (FIG. 8 b) ₀

Next, compressed air is supplied from the lower press die 5a. That is, the compressor 1 is operated to feed compressed air from the compressed air passage 52 of the lower press die 5a, and to blow air from the member 26 via the communication passage 23 and the passage 54. Since the lower press mold 5a is heated by the heater 24, the air flowing in the passage 54 is also heated, and thus the heated air blows out from the lower press mold 5a. Simultaneously with the blowing of heated air by the lower press die 5a, vacuum suction is performed from the upper press die 4a. As a result, the hydrated papermaking molded product 12 is released from the lower press die 5a and is suction-held by the upper press die 4a (FIG. 8c). Next, the heated air is blown again from the upper press die 4a, and vacuum suction is performed from the lower press die 5a.

In this way, by switching between hot air blowing and vacuum suction alternately between the upper press die 4a and the lower press die 5a, the hydrated papermaking molded product 1 2 becomes the upper press die 4a and the lower press die 5a. Swing up and down between. The up-and-down swing of the water-containing molded article 12 is repeated several times.

By performing the above-mentioned vertical shaking treatment of the hydrated paper molded article, the hydrated paper molded article 12 can be efficiently heated and dried, and the hydrated paper molded article 12 can be successfully released from the mold. That is, when the hydrated paper-molded article 12 swings up and down, the air heated from the mold surface in the upper press die 4a or the lower press mold 5a is blown to the hydrated paper-molded molded article 12, so that the hydrated paper-molded article 12 Heat drying of 12 is promoted. In addition, the vertical movement of the hydrated molded article 12 causes air to diffuse, and the water vapor remaining on the surface of the hydrated molded article 12 escapes. Is further promoted.

Also, by oscillating the hydrated paper-made molded article 12 up and down, the molded article 12 becomes Even if it has a property that makes mold release difficult such as having a complicated shape, it is easy to release, and it is possible to easily take out a molded product from the mold in the final step.

After the up-and-down swinging step of the hydrated paper-formed product 12, the hydrated paper-formed product 12 is sucked and held by the upper press die 4 a and the lower press die 5 a is moved downward to remove the lower press die 5 a. Return to the old position (Fig. 9).

Next, the support 3 is rotated, and the upper press die 4a is displaced to a position above the lower press die 5b in the second dry forming zone C while holding the hydrated papermaking molded product 12; The mold 5b moves upward. The lower press die 5b stops at a predetermined position based on a clearance set value between the upper press die 4a and the lower press die 5b.

By the combination of the upper press die 4a and the lower press die 5b, the hydrated papermaking molded product 12 is sandwiched between the upper press die 4a and the lower press die 5b, pressed and heated and pressed. . During this hot pressing, suction and heating are performed in the upper press die 4a and the lower press die 5b, respectively. However, since the structure of the lower press die 5b is the same as that of the lower press die 5a, the upper press die 4a and the lower press die 5a have the same structure. The suction mechanism and the heating mechanism in the lower press die 5b are the same as the suction mechanism and the heating mechanism shown in FIG. '

Dry molding using the upper press die 4a and the lower press die 5b yields a water-containing paper-formed product having a further reduced moisture content.

After the heating press using the upper press die 4a and the lower press die 5b is completed, the upper press die 4a and the lower press die 5b are slightly separated, and air blowing and vacuum suction are performed in the same manner as described above. It is alternately switched between the upper press die 4a and the lower press die 5b, and the hydrated paper molded product 12 is swung up and down. After the up-and-down swing process of the hydrated molded article 1 2, the hydrated molded article 1 2 is moved upward. The press die 4a is sucked and held, and the lower press die 5b is moved downward to return the lower press die 5b to the old position.

Next, the support 3 is rotated, and the upper press die 4a is displaced to a position above the lower press die 5c in the third dry molding zone D while holding the wet papermaking molded product 12; The mold 5c moves upward. The lower press die 5c stops at a predetermined position based on a clearance set value between the upper press die 4a and the lower press die 5c.

By combining the upper press mold 4a and the lower press mold 5c, the wet formed article 12 is sandwiched between the upper press mold 4a and the lower press mold 5c, pressed and heated and pressed. You. In this heating and drying step, suction and heating are performed by the same mechanism as described above (the mechanism shown in FIG. 5).

After the heating press by the upper press die 4a and the lower press die 5c is completed, the upper press die 4a and the lower press die 5c are slightly separated from each other, and air blowing is performed in the same manner as described above. Vacuum suction is alternately switched between the upper press mold 4a and the lower press mold 5c, and the hydrated paper molded product 12 is swung up and down.

In this embodiment, the dry molding step is completed in the third dry molding zone D, and a final molded article, a paper molded article 28, is obtained. The moisture content of the paper-formed article 28 is 0 to 10% by weight.

The obtained molded article 28 is sucked and held by the upper press die 4a, and the lower press die 5c is further moved downward to return the lower press die 5c to the old position. In accordance with the downward movement of the lower press die 5c, the receiving table 35 of the molded article receiving device 36 moves forward and stops when it reaches a position below the upper press die 4a.

Next, compressed air is supplied from the compressed air passage 47 of the upper press die 4a, Air is blown out from the surface of the upper press die 4a through 25. As a result, the molded article 28 is released from the upper press mold 4a, and falls onto the lower receiving table 35 (FIG. 10). In the present invention, since the hydrated paper-formed product 12 is vertically swung, the paper-formed product 28 can be easily removed from the upper press die 4a.

After receiving the molded article 28, the receiving table 35 for the molded article moves backward. When the receiving table 35 returns to the original position or while moving backward, the receiving table 35 is inclined to lower the paper-formed product 28 downward. A transport device such as a belt conveyor is installed at a lower position where the molded article 28 falls, and receives the dropped molded article 28 and transports it to the next process.

In the up-and-down swinging process of the hydrated paper-formed product, the distance for separating the upper press die and the lower press die does not need to be set large, and a small interval necessary for the hydrated paper-formed product to move up and down may be provided. The spacing is preferably 1 to 10 mm. The number of vertical swings can be arbitrarily determined as needed, but is preferably 1 to 10 times. The vertical swinging operation is preferably performed in each of a plurality of dry forming steps, that is, every time after one heating press processing and before moving to the next heating press processing, but may be performed in a part of the steps. For example, if the purpose is only to easily release the molded product, the vertical swing operation of the molded product may be performed only in the last dry molding process among the multiple dry molding processes. Good.

The above-described embodiment of the present invention employs a rotary system in which a hydrated papermaking molded product is transferred in the circumferential direction to perform heating and drying in a plurality of stages. However, the present invention is applied only to this mouth-to-mouth system. However, it can also be applied to a linear type in which a hydrated paper-made molded product is transferred in the horizontal direction and heated and dried in multiple stages. It is possible.

Examples of the molded article manufactured by the present invention include small electrical appliances, containers for packaging precision machinery, containers for packaging food such as eggs, and cushioning materials for packaging. Industrial applicability

ADVANTAGE OF THE INVENTION According to this invention, it can heat-dry efficiently at the time of manufacture of a molded article, and since it is easy to release a molded article, it is useful for the sheet molding of packaging containers etc. from the viewpoint of improving production efficiency. It is.

Claims

The scope of the claims

1. The papermaking mold is immersed in the pulp raw material liquid, the pulp component is removed to form a water-containing papermaking product on the papermaking die, and the water-containing papermaking product is sandwiched between the papermaking die and the upper press die to be dehydrated and dried. And producing a wet molded article by sandwiching the wet molded article between an upper press die and a lower press mold and heating and drying to produce the wet molded article. After pressing the molded product between the upper press die and the lower press die and performing hot pressing, the upper press die and the lower press die are separated, and a space is provided to allow the hydrated papermaking molded product to move up and down. Compressed air is blown from one of the lower press dies to the hydrated paper-formed product, and the other press die is evacuated to the hydrated paper-formed product by vacuum. Alternating between press dies Method of manufacturing a papermaking molded article, characterized in that performed.

2. A compressed air is blown from the upper press mold to the hydrated paper-formed article, and the hydrated paper-formed article is sucked and held in the lower press mold by the lower press die, and then the lower press is pressed. Compressed air is blown from the mold to the hydrated paper-formed product, and the hydrated paper-formed product is sucked and held in the upper press mold by vacuum suction in the upper press die. 2. The method for producing a paper-molded article according to claim 1, wherein the suction holding to the press die and the suction holding to the upper press die are alternately repeated.

3. The method according to claim 1 or 2, wherein a plurality of passages are provided in the upper press die and the lower press die, each opening to the surface of the die, and the compressed air is blown and vacuumed through the passages. The method for producing a sheet-formed article.

4. A pressurized air passage and a vacuum passage are provided on a base for supporting and fixing the upper press die, and the pressurized air passage and the vacuum passage are communicated with a passage of the upper press die. 4. The method for producing a paper-molded article according to claim 3, wherein compressed air is blown through the vacuum passage and vacuum suction is performed through a vacuum passage.

5. A compressed air passage and a vacuum passage are provided in a base for supporting and fixing the lower press die, and the compressed air passage and the vacuum passage are communicated with a passage of the lower press die, and compressed air is blown through the compressed air passage and a vacuum passage is formed. 4. The method for producing a paper-molded article according to claim 3, wherein the vacuum suction is carried out through.

6. In a hot press machine that manufactures a paper-formed product by hot-pressing a water-containing paper-formed product between a press die placed at the top and a press die placed at the bottom, a plurality of presses are placed inside the press die. A hot press apparatus for papermaking molding, characterized in that one end of the passage is opened to the surface of the press die and the other end of the passage is connected to the compressed air passage and the vacuum passage.

7. The heating press device in papermaking molding according to claim 6, wherein the press die is supported and fixed to the base, and the compressed air passage and the vacuum passage are provided in the base.

8. The heating press device in papermaking and molding according to claim 6, wherein the compressed air passage is connected to a compressed air supply device such as a compressor, and the vacuum passage is connected to a vacuum suction device such as a vacuum pump.

9. The scope of claim 7, wherein a communication passage is provided in the base, the passage and the compressed air passage are communicated via the communication passage, and the passage and the vacuum passage are communicated via the communication passage. Heat press equipment in papermaking and molding.

10. The heating press device in papermaking and molding according to claim 7, wherein a heating device is provided inside the base.

11. The hot press apparatus in papermaking and molding according to claim 6, wherein a member having a fine hole is attached at a position where the passage is open on the surface of the press die.