JP2000034700A - Production of papermaking molded product and production system therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a papermaking molded product using a hot-drying mold through preventing steam explosion by hot-pressing under pressurization to maintain the production efficiency of the aimed product at high levels. SOLUTION: This method for producing a papermaking molded product comprises the following process: a papermaking mold 15 is immersed in a vat 13 for a pulp slurry to suck the slurry, the resulting hydrous deposit in the papermaking mold 15 is then sucked onto a taking mold 16 to afford a hydrous papermaking molded material, which, in turn, is transferred successively onto the respective bottom forces 8 of molds disposed at regular intervals on a rotating table 25, and then dried under hot pressing while the rotating table is being in tact rotation, and the aimed product thus dried is withdrawn from the mold and sent out to an inspection line; wherein the intermediate product is preliminarily hot-pressed at delivery section of the dryer and then dried to enable the production efficiency in the clamping drying operation to be considerably improved without causing any steam explosion.

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 molded product such as a cushioning material for packaging by a wet method using a pulp material such as waste paper pulp or virgin pulp, and more particularly to a suction dehydration method for finish drying. The subsequent hydrated molded article (wet molded article) is transferred to a pair of molds that engage with each other, and is heated and dried while controlling the position of the mold so as to have a predetermined clearance. The present invention relates to a manufacturing method and a manufacturing apparatus.

[0002]

2. Description of the Related Art Styrofoam and pulp molded articles are used as cushioning materials for packaging home appliances, precision equipment and foods. Of these, pulp as a raw material is mainly used for food packaging such as small electric appliances and eggs. In particular, a pulp paper molded article or a paper molded article has attracted attention as a packaging cushioning material replacing Styrofoam due to its effect on the environment. Conventionally, an apparatus for producing a molded article used in these packaging containers is prepared by dispersing wastewater pulp or the like as a raw material in water, and then vacuum-suctioning the papermaking component in the liquid to remove the papermaking component.
One having a papermaking molding mechanism for forming a hydrated papermaking molded article (or wet molded article) of a predetermined shape by suction dehydration from the papermaking component, and a drying mechanism for putting the hydrated papermaking molded article into a hot-air drying oven and drying it There is.

[0003] Further, a water-containing paper-molded product of a fiber laminate formed on the surface of the paper-mold by suction dehydration through a paper-mold is removed from the paper-mold and then introduced into a predrying oven to be dried. There is known a method of obtaining a final product by introducing into a non-breathable mold in which male and female are engaged again, and then heating and drying under pressure. After forming and dewatering the hydrated molded article, a dry molding space is formed by closing the mold, and a male and female pair having a press hole with a drain hole for releasing moisture and steam remaining in the hydrated paper molded article from the dry space. An apparatus comprising a drying mechanism for drying and molding the hydrated paper-formed product by hot-pressing the hydrated paper-formed product obtained by the above-mentioned papermaking-molding mechanism using the press die described above.

[0004]

However, in an apparatus for drying with hot air, a large distortion is generated in the dry molded product due to high moisture content and free drying without restraint, so that the product is not aligned when the products are lined up. However, there was a problem that it was irregular and could not be handled by the automatic packaging machine. On the other hand, in order to prevent mold deformation, after the dehydrated water-containing molded article is once placed in a preheating furnace, the method is again introduced into the male and female opposing heating and drying molds for heating and drying. It was not possible to completely remove the geometric distortion that occurred in it, and there were many problems in terms of dimensional accuracy. In the case of constrained drying using a dividable mold having a fixed gap, moisture tends to change and shrink to lower the thermal efficiency.

In a method using only a heat-drying mold, there is no problem associated with the deformation of these molded articles, but when pressed at a high temperature, a steam explosion occurs. In particular, in a method using only a heat-drying type that moves intermittently by a bucket conveyor, as disclosed in Japanese Patent Application Laid-Open No. Hei 4-323683 (Patent No. 2579875), when the press is performed at a high temperature, the clearance accuracy of the press type is liable to fluctuate. Since this causes generation, the temperature must be lowered frequently, and improvement in production efficiency cannot be expected. A first object of the present invention is to provide a method for continuously manufacturing a paper-formed article while clamping on a rotary table and an apparatus for manufacturing the same. Further, the second object is to transfer the hydrated papermaking molded product after suction dehydration to a pair of dies which engage with each other at the time of finish drying, and to heat while controlling the position of the dies so as to have a predetermined clearance. It is an object of the present invention to provide a method and apparatus for manufacturing a paper-formed article having good dimensional accuracy by drying while drying.
Further, the third object is to suppress the occurrence of a steam explosion by pressing at a high temperature while applying pressure when producing a molded article by using a heat-drying mold, thereby maintaining a high production efficiency. An object of the present invention is to provide an article manufacturing method and an apparatus.

[0006]

Means for Solving the Problems To achieve the above object, a first aspect of the present invention is a step of immersing a papermaking mold in a pulp slurry vat and sucking the pulp slurry; A step of sucking the sucked hydrated sediment into the mold to obtain a hydrated paper molded article, and sequentially transferring the hydrated paper molded article in the mold to a number of molds arranged at regular intervals on a rotary table. And drying the hydrated paper-molded product in the mold while heating and pressurizing while the rotating table rotates in a tact, and removing the heated and dried product and sending it to an inspection line. It is a manufacturing method of.

According to a second aspect of the present invention, the mold for sucking the hydrated paper-formed product is moved to a lower die on a rotary table by turning in a horizontal plane, and the hydrated paper-formed product is sequentially supplied to the lower die. The rotary table is characterized in that the upper die and the lower die that can move up and down are rotated at the same timing, and the mold is clamped while being heated and dried by heating. A third aspect of the present invention is the method according to the first aspect, wherein the hydrated paper-formed product is provided on a fixed table with a plurality of stationary upper and lower dies corresponding to the shape of the paper-formed product and capable of moving up and down with a certain dimension, and on a rotary table that rotates tact. The upper mold and the same number of stations are transferred to dry molding, and while heating, the gaps in the upper and lower molds are optimized at multiple heating stations to cope with shrinkage due to drying of the molded product, and are sequentially heated and pressed and dried. It is characterized by the following.

According to a fourth aspect of the present invention, in the first aspect, the mold having sucked the water-containing molded article is moved linearly to a lower mold on a rotary table, and the molded article in the mold is reduced to a lower mold. It is characterized by being supplied sequentially. Claim 5 is a method according to claim 1, wherein the hydrated papermaking molded product is transferred from the paper transfer molding process to the drying and molding process from the mobile transfer device to the heating lower die, and is simultaneously sandwiched between the mobile transfer device and the lower die. It is characterized by drying under pressure. Claim 6
5. A press ratio of 0% to 5 with respect to a paper thickness of a hydrated papermaking molded product in which the clearance between the lower dead center of the transfer die and at least the flat part of the lower die in the same station is dried.
It is characterized by being controlled to be 0%. A seventh aspect of the present invention is characterized in that, in the fourth aspect, steam is sucked and discharged from the inside of the mold at the same time as pressing and pre-drying by sandwiching between the transfer device and the lower mold.

The present invention provides an apparatus for producing a molded article to be clamped and dried, wherein the papermaking component is obtained from a raw material of the molded article and dewatered to obtain a hydrated molded article. An apparatus for manufacturing a sheet-shaped molded article having a dry molding mechanism for drying and molding a molded article; the dry molding mechanism corresponds to the shape of the molded article, and the upper and lower dies movable vertically can be intermittently driven at the same timing. Have on a rotating table that works,
This is an apparatus for producing a sheet-shaped molded product, comprising a drying step of clamping and heating and pressing while heating.

According to a ninth aspect of the present invention, in the eighth aspect, the drying and forming mechanism is provided with a plurality of stations on the fixed table, the upper die capable of moving the upper and lower parts having a fixed dimension corresponding to the shape of the molded product, and is operated by intermittent driving. A drying process that has a lower die with the same number of stations as the upper die on a rotary table, and heats and presses sequentially while optimizing the gap between the upper and lower dies corresponding to shrinkage due to drying of the molded product at multiple heating stations while heating. It is characterized by consisting of.

According to a tenth aspect of the present invention, in the eighth aspect, the upper and lower molds corresponding to the shape of the dry molding mechanism and capable of moving the upper and lower parts by a fixed dimension are arranged at a plurality of stations on the fixed table, and are operated by intermittent driving. It has lower dies with the same number of stations as the upper dies on the rotary table, and is moved from the transfer device to the heated lower die to transfer the formed paper from the paper making mechanism to the drying and forming mechanism, and at the same time, the transfer device and the lower It is characterized in that it is pressed and dried while being sandwiched between molds.

According to an eleventh aspect, in the eighth aspect, the press ratio is 0% to 50% with respect to the paper thickness of the wet product in which the clearance between the lower dead center of the transfer die and at least the flat portion of the lower die in the same station is dried. Is controlled as described above. Claim 12 is Claim 10
It is characterized in that it is sandwiched between a transfer device and a lower mold, pre-pressurized and pre-dried, and at the same time, water vapor is sucked and discharged from the mold.

According to a thirteenth aspect of the present invention, in order to transfer the hydrated papermaking molded product from the papermaking molding mechanism to the drying molding mechanism, the hydrated papermaking molded product transferred from the transfer device to the heating lower mold is removed from the molding die. At the same time as being transferred to the drying mold, it is pressed and dried in a state of being sandwiched between the transfer device and the lower die, and at the time of finish drying, the water-containing molded article after suction dehydration is transferred to a pair of molds that engage with each other, and a predetermined It is characterized by heating and drying while controlling the position of the mold so as to have a clearance.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a flow chart showing a process for producing a papermaking molded article (pulp molded product) of the present invention. As shown in FIG. 1, a step of immersing a papermaking mold in a pulp slurry vat and sucking the pulp slurry. 1, a papermaking mold is pulled up from a pulp slurry vat, and a water-containing papermaking molded article (wet molded article) is obtained by dewatering the hydrated sediment sucked into the papermaking mold, and hydrated papermaking in the papermaking mold. Step 3 of sequentially transferring the molded product (wet molded product) to a molding die arranged on a rotary table at a constant interval, and a water-containing papermaking molded product (wet molded product) in the molding die while the rotary table rotates tact. Heating
It comprises a step 4 of drying while applying pressure, and a step 5 of taking out and drying the heated and dried product to an inspection line.

FIG. 2 shows a molding die 6 composed of upper and lower dies 7 and 8. The upper and lower dies 7 and 8 are provided with cavities 9 for molding a hydrated papermaking molding when the dies are closed. Cavity 9
The upper die 7 has drying holes 11, 11 at predetermined positions.

The manufacturing apparatus of the present invention has a papermaking and forming mechanism and two drying mechanisms. The papermaking / molding mechanism includes a pulp slurry suction unit and a unit for dewatering a formed high-water-containing papermaking / molded product by taking out a predetermined mesh. Using a mold corresponding to the shape of the final molded article, the water-containing molded article is taken out of the paper mold while sucking, and moved to a heating and drying unit.
The papermaking mold has drainage and air permeability, and sucks and dehydrates a pulp solution containing water under a negative pressure to form a water-containing papermaking product along the surface of the mold. When removing the molded product from the mold, pressurized air is blown from the mold. The take mold also has a vent hole that can be sucked, and is delivered from the making mold. That is, the hydrated paper-formed molded product obtained from the papermaking mold is transferred to an engaging die, and the water is further suction-dehydrated.

The hydrated papermaking molded product transferred to the mold is sent to a drying step. In the drying step, the upper and lower dies (press dies) which are arranged on a rotary table and engage with each other are clamped and dried. The press die used for mold clamping drying consists of male and female shapes of a lower die having an inner surface shape and an upper die having an outer surface shape of a hydrated papermaking molded product, and its material is mainly aluminum alloy, and aluminum alloy. What cut out the block is used. As a drying means provided in the press mold, it is general to provide an electric heating device in the press mold for heating. However, there is also a means for connecting a high-frequency oscillator to the press mold and applying a high frequency for drying. In addition, electric heating and high-frequency heating can be used in combination.

The present invention relates to a manufacturing method and an apparatus through the above steps. The basic structure of the present invention is that the step of clamping and drying is constituted by a rotary table type continuous apparatus. is there. By adopting a rotating table like this method, compared to the conventional method, the upper and lower belt conveyors have upper and lower molds compared to the method of sandwiching and heating with a conveyor system having an upper mold and a lower mold. The fitting accuracy and position accuracy are improved, and drying unevenness is remarkably reduced. This makes it possible to finely control the heating temperature, thereby improving the drying performance. Further, the number of molds can be minimized as compared with the upper and lower belt conveyor system, and the mold cost is advantageous.

(Embodiment 1) Hereinafter, Embodiment 1 of the present invention will be specifically described with reference to the drawings. This embodiment employs a take-up type with a suction cylinder, a take-up type rotary movement system, a lower die sliding type, and a tact rotary table type of lower die holding. FIG. 3 is a front view of this embodiment, and FIG. 4 is a plan view of FIG. The manufacturing apparatus of the present example includes a sheet making machine 12 and a moving device 2.
2 and a tact rotary table type molding machine 23.
The papermaking machine 12 includes a tank (bat) 13 filled with raw material slurry, a rotary suction device (drum) 14, and a papermaking die 15 having a plurality (four in the figure) of suction heads provided on the peripheral surface of the rotary suction device. It is composed of The transfer device 22 is provided with a removing die 16 for sucking the water-containing molded product 20 attached to the papermaking die 15.
, A suction cylinder 17 provided on a mold 16, and a mold 1
6 is a swivel arm 1 that swivels between the suction position of the hydrous molded product 20 attached to the papermaking mold and the position of the molding die on the rotary table.
8 and a holding member 19 of a swing arm provided on a fixed upper plate 29 of the molding machine main body. The molding machine 23 is composed of upper and lower rotary tables 24 and 25, upper and lower dies 7, 8 arranged on the rotary tables 24 and 25, an index device 26, an upper die lifting device 27, and a discharge device 28. 3 and 4, reference numeral 27 denotes a pressurizing cylinder provided on each upper mold, 2
8 is a product discharge cylinder provided on the rotary table 25, 30
Is the rotation axis of the index device, 31 is the upper and lower fixed plates 4
It is a pillar provided in the corner.

The drum 14 is supported by a lifting / lowering device (not shown), and is capable of rotating tact in accordance with the number of dies on the peripheral surface of the drum. At the time of suction of the papermaking mold 15, the drum is stopped, and the drum is lowered into the vat 13 to sink into the slurry tank until the papermaking mold 15 at the suction position reaches the bottom dead center closest to the slurry head. . During this time, the pulp slurry is adhered to the papermaking mold 15 while sucking. Moisture is about 75%. After the suction, the drum returns to the original height position (top dead center) while rotating as shown by the arrow in FIG. 3, but the water-containing molded body is dehydrated by a vacuum device (not shown) until the drum reaches the top dead center. Is done.

In FIGS. 3 and 4, after reaching the top dead center of the rotary suction device, the horizontal swivel arm 18 arranged at the upper part
The water-containing molded product is transferred to the molding die (dryer main body) by turning by 0 degrees. However, as described later, a horizontal and straight traveling method using a cylinder as shown in FIGS. The hydrated product supplied to the receiving die (lower die 8) by the transfer device 22 is positioned, and then heated and dried by being sandwiched by the upper movable die 7 installed on the upper rotary table 24. .

By increasing the number of divisions arranged on the rotary table, the number of cycles can be increased and the overall heating and drying time can be extended. However, if the drying time is increased, the diameter of the table becomes large, and the required drying time is reduced. It is necessary to determine the number of divisions. During the stop time of the intermittent drive index, it is necessary to perform operations such as moving to a water-containing molded article, pressurizing, and the like. If the production of the hydrated molded article in the preceding step is faster than the heating step, the number of treatments can be increased by using multiple dies on the heating table. After several cycles of heating time, the hydrated molded product that has become almost completely dry is opened at the discharge station within the stop time and the air blown out from the lower die or the vertical movement of the push rod Separate from the lower mold. Thereafter, the paper is discharged from the apparatus by a discharge device having a suction device and moves to the next step. The hydrated molded article that has undergone the hot air drying step of the next step is shipped as a product after inspection. According to the first embodiment, the provision of the drying section of the clamped rotary table system prevents deformation of the papermaking mold, prevents steam explosion at the time of mold clamping, and provides a molded article with little deformation, thereby reducing production efficiency. It can be greatly improved.

(Embodiment 2) FIG. 5 shows a second embodiment of the present invention and is a front view showing a manufacturing apparatus of a transfer system by linear movement, a system in which the lower die slides and then the upper and lower dies are rotated together. FIG. 6 is a plan view of FIG. The main difference between this embodiment and FIGS. 3 and 4 is that a reciprocating cylinder 35 is used as a transfer device, and a slide device 36 is provided on the lower turntable 25 at a position facing the upper die 7. , Lower body 8
Has a structure capable of sliding a predetermined distance in the normal direction of the rotary table. The reciprocating cylinder 35
Is supported by a support (not shown) separate from the upper table 24.

Since the transfer device is the cylinder 35, a stop time of at least 5 seconds is required. First, the hydrated molded product is adsorbed and moved by the cylinder toward the main body. At this time, since the lower mold 8 at the receiving position of the main body is moved near the outer edge of the rotary table and is in a standby state, the wet molded product is inserted and transferred without interfering with the upper mold. Next, the slide type lower die 8 moves and stops in the direction of the table center. The drying process is the same as the operation according to FIGS. In the final station, after the upper mold 7 is opened, the lower mold 8 having the water-containing molded product slides in the outer peripheral direction of the table and is discharged by a take-out means such as a suction device (not shown). Thereafter, the operation returns to the receiving section of the water-containing molded article by intermittent driving, and the operation is repeated.

(Embodiment 3) FIG. 7 is a front view of a manufacturing apparatus according to Embodiment 3, and FIG. 8 is a plan view. The point of the present example is that the process of clamping and drying can be performed so that the gap is gradually changed by a continuous device of a fixed mold and a lower mold installed on a rotary table so that the decrease in heating efficiency due to drying shrinkage can be improved. It is to be configured. As shown in FIGS. 7 and 8, the hydrated paper-formed product is taken out from the paper-making die 15 while being suctioned by using a die 16 corresponding to the shape of the final paper-formed product, and is moved to the heat-dried die 8. As before, the papermaking mold 15 has drainage and air permeability, and sucks and dehydrates the pulp solution containing water under negative pressure to form a water-containing molded article along the surface of the mold. When removing the molded article from the mold, pressurized air is blown from the mold. The take mold also has a vent hole that can be sucked in the same manner, and is delivered from the making mold 15. That is, the water-containing molded product taken from the papermaking die is transferred to the engaging die 16 to be engaged, and the water is further suction-dehydrated. In the drying step, the upper mold 7 installed on the fixed table and the lower mold 8 arranged on the rotary table and engaged with each other are clamped and dried. The upper die 7 has a structure in which it can be moved up and down by a driving means 31 such as a hydraulic cylinder to change the position of a vertical dead center. Thereby, the setting of the gap between the upper mold and the lower mold can be changed for each station.

In the case of FIGS. 7 and 8, the hydrated product is delivered to the lower mold so as not to be interfered by the gap between the upper mold and the lower mold at the top dead center. The water-containing molded body supplied to the lower mold is pressed from above with a light-weight holding plate, or positioned with suction force from inside the lower mold, and then rotated with the upper mold that is mounted on the upper fixed table and movable up and down. It is heated and dried after being sandwiched with a certain gap by the lower mold on the table. By increasing the number of divisions placed on the rotary table, the number of cycles can be increased and the overall heating and drying time can be extended, but if the drying time is increased, the diameter of the table will increase and the drive device will need to be larger. Determining the division according to the drying time
Same as the previous embodiment.

According to the third embodiment, the use of the rotary table allows the upper and lower belt conveyors to be fitted with a set of upper and lower dies as compared with a method of sandwiching and heating the upper and lower belt conveyors by a conveyor system having an upper die and a lower die. In this case, the positional accuracy is improved, and uneven drying is significantly reduced. This makes it possible to finely control the heating temperature, thereby improving the drying performance. Further, the number of molds can be minimized as compared with the upper and lower belt conveyor system, and the mold cost is advantageous. In addition, by providing a rotary table type drying unit that sequentially reduces the voids according to the degree of drying and clamps the mold, it prevents deformation of the papermaking mold, prevents steam explosion at the time of mold clamping, and reduces the deformation of the molded article. As a result, the production efficiency can be greatly improved.

(Embodiment 4) FIG. 9 is a front view showing another example of the manufacturing apparatus of the present invention (transfer section: with a transfer apparatus pressurized cylinder, moving apparatus driving method, lower mold holding table rotating method). is there. FIG. 10 is a plan view of FIG. FIG. 11 is an enlarged front view of the transfer unit (transferring device).

In the above-mentioned apparatus, first, a wet suction molding is performed by a rotary suction molding machine 12 having a plurality of suction heads installed above a vat 13 filled with a pulp slurry liquid. Specifically, the transfer die 21 is lowered by the vertical device 38 such as a cylinder at the bottom dead center where the papermaking die 15 installed on the peripheral surface of the rotary turret 14 is closest to the slurry head, and the slurry tank (bat) is formed. It sinks into 13. During this time, the pulp slurry is deposited on the transfer mold 21 while sucking. After a certain period of time interlocked with the dryer in the next step, the suction cylinder 38 rises, and the rotary suction device (turret) 14 is rotated intermittently. Until the top dead center is reached, the water-containing molded article is dehydrated by a vacuum device. After reaching the top dead center of the rotary suction device, the hydrated papermaking molded product is moved to the dryer main body by the moving device 22 arranged above.

In the movement and transfer of the moving device, the hydrated paper-made product is transferred to the lower die 8 so as not to be interfered by the gap between the upper die 7 and the lower die 8 at the top dead center. A small pressure cylinder 38 is provided at the tip of the turning arm 18. Lower mold 8
The hydrated papermaking molded product supplied to the above is pressed from above by a presser plate 39 (FIG. 11) with a light load, or is positioned by suction from the inside of the lower mold, and then is moved up and down by the upper fixed table 24. The upper die 8 and the lower die 8 on the turntable 25 are sandwiched with a certain gap therebetween and then dried by heating. The press ratio is 0 to 50%, preferably 5 to 40%. After several cycles of heat treatment on the turntable, the hydrated paper-formed product, which has become almost completely dry, is opened at the discharge station within the stop time and the air blown out from the lower mold 8 is discharged. Alternatively, it is separated from the lower mold 8 by the vertical movement of a push rod (not shown). Thereafter, the paper is discharged from the apparatus by a discharge device having a suction device, and moves to the next process such as inspection.

The present inventors have conducted intensive studies on the case of drying with this heat-drying mold (the mold 6 shown in FIG. 2), and have found the following phenomena, leading to the present invention. The water content of the water-containing molded product obtained in the papermaking process is about 75%. When the hydrated paper-formed product is dried by a heating press, the drying press time and the change in moisture are examined. FIG. 12 shows a drying curve of the hydrated paper-formed product. ) Indicates the case of natural drying. As shown in FIG. 12, two curves are obtained. The first curve α shown in FIG. 12B is considered to be a free water drying curve, and the second curve β shown in FIG. 12A is considered to be a drying curve of bound water bound to pulp.

Conventionally, in a method of drying with a heating press, in order to shorten the drying time and improve the production efficiency, 220 ° C.
It was necessary to dry at the above high temperature. For this reason, a local steam explosion always occurred. If a drying press is performed at a temperature of about 180 ° C. to avoid this, the drying time is prolonged and the production efficiency is reduced. This is because the drying time of the second curve is rate-determining with respect to the time of the first curve because the slope of the second curve is very gentle. Further, in order to avoid steam explosion with a high-temperature heating press, the above-described suction hole must be buried in a heating press mold, which inevitably increases the cost.

In the present invention, as a result of diligent studies in view of this point, the paper thickness of the water-containing paper-formed product in a state of containing water is reduced in order to reduce the initial moisture when the first curved portion is dried by hot press drying. And the clearance formed between the lower mold and the lower dead center of the transfer mold when it is transferred from the papermaking mold to the heat-drying mold (molding mold). The formed water-containing paper-molded article contains about 75% of water, but the steam explosion occurs at 200 ° C.
In this case, the thickness of the wet paper was set to 50% or less. Here, the press ratio is: press ratio = [(water-containing paper thickness-clearance) / water-containing paper thickness]
× 100%.

Further, at least the clearance of at least the flat portion of the upper mold 7 and the lower mold 8 to be heated and clamped is brought into contact with the hydrated paper-made molded product. After setting the water content and holding it for a few seconds so that the water content of the water-containing molded article becomes 65% or less, the steam explosion can also be prevented by setting the clearance so that the finished product has the desired density and pressing. While drying. When the content is less than 65%, a steam explosion does not occur because the spots from the pulp fiber of free water do not become a continuous film.

The pre-pressurized heating under the above-mentioned press ratio condition at the bottom dead center position of the transfer die when the transfer is performed from the paper making die to the heating and drying die makes it possible to reduce the water content in this station to 65%.
The steam explosion does not occur. At this time, it is effective to have a suction device connected to a vacuum device in the mold in order to discharge the water vapor generated during the pressure drying. By heating and drying with the upper and lower dies in a constrained state after the predrying step, it is possible to dry in a shorter time as compared with a method not using predrying.

The characteristics of the product are as follows. In the case of a conventional product dried without pressing, for example, a basis weight of 574 g / m ² ,
While the density is 0.33 g / cm ³ , the one obtained by heating under pressure as in the present invention has a basis weight of 536 g / m ² and a density of 0.
It showed 41 g / cm ³ . FIG. 13 shows a drop test (80 cm) as a buffering property evaluation of the conventional product and the present invention product.
FIG. 14 shows a left side continuous drop / drop test (80 cm).

[0037]

According to the method for producing a molded article of the present invention,
When producing a molded article using a heat-drying mold, pressing at a high temperature while applying pressure can suppress the occurrence of a steam explosion and maintain a high production efficiency. According to the first aspect of the present invention, by providing a drying section of a rotary table type in which the mold is clamped, deformation of the papermaking mold is prevented, a steam explosion at the time of mold clamping is prevented, and a molded article with little deformation can be obtained, thereby greatly increasing production efficiency. Can be improved. According to the second aspect of the present invention, according to the method for producing a papermaking molded article of the present invention, the deformation of the papermaking mold can be reduced by providing a rotary table type drying unit that sequentially reduces the gaps according to the degree of drying and clamps the mold. Thus, a molded article with less deformation can be obtained, and the production efficiency can be greatly improved. Further, according to the third aspect, by drying after pre-pressurizing and heating at the drying device transfer section, the production efficiency in mold drying can be greatly improved without explosion of steam.

[Brief description of the drawings]

FIG. 1 is a schematic view showing the steps of a method for producing a papermaking molded article according to the present invention.

FIG. 2 is an enlarged sectional view of a molding die.

FIG. 3 is a front view showing an example of an apparatus for carrying out the method for producing a papermaking molded article of the present invention.

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is a front view showing another example of the manufacturing apparatus of the present invention.

FIG. 6 is a plan view of FIG. 5;

FIG. 7 is a front view showing still another example of the manufacturing apparatus of the present invention.

FIG. 8 is a plan view of FIG. 7;

FIG. 9 is a front view showing another example of the manufacturing apparatus of the present invention.

FIG. 10 is a plan view of FIG. 9;

FIG. 11 is an enlarged front view of a delivery unit.

FIG. 12 shows a drying curve of a hydrated papermaking molded article,
(A) shows the case of mold drying, and (b) shows the case of natural drying.

FIG. 13 shows a drop test (80c) of a conventional product and a product of the present invention.
It is a figure which shows the result of m).

FIG. 14 is a diagram showing the results of a left side continuous drop / drop test (80 cm) of the conventional product and the product of the present invention.

[Explanation of symbols]

1 Step of sucking pulp slurry 2 Step of sucking sediment in a papermaking mold into a mold to obtain a hydrated papermaking molded article 3 Step of transferring the hydrated papermaking molded article in the molding die to a molding die 4 Inside of a molding die Step of heating and drying the water-containing molded article of Step 5 Step of taking out and heating and drying the product and sending it out to the inspection line 6 Mold 7, 8 Upper and lower molds 9 Cavity 10 Heater storage unit 11 Ventilation hole for drying 12 Sheet making machine 13 Bat Reference Signs List 14 Drum 15 Making die 16 Take-out die 17 Suction cylinder 18 Swivel arm 19 Holding member 20 Water-containing papermaking molded product 21 Delivery die 22 Transfer device 23 Molding machine 24, 25 Rotary table 26 Index device 27 Pressure cylinder 28 Discharge cylinder 29 Fixed Table 30 Index shaft 31 Support 35 Moving cylinder 36 Slide device 38 Pressing cylinder 39 Hold down

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masao Kurosawa 5-12-8 Ginza, Chuo-ku, Tokyo Oji Paper Co., Ltd. F-term (Reference) 4L055 BF06 CJ06 FA22 FA23 GA05

Claims (13)

[Claims] 1. A step of immersing a papermaking mold in a pulp slurry vat to suck the pulp slurry, and taking out the water-containing sediment sucked into the papermaking mold and sucking it into the mold to form a water-containing papermaking molded product. Obtaining step, sequentially transferring the hydrated paper-molded product in the mold to a number of molds arranged at regular intervals on a rotary table, and hydrated paper-forming molding in the mold while the rotary table rotates tact. A method for producing a molded article comprising a step of drying a product while heating and pressurizing the same, and a step of taking out the product which has been dried by heating and sending it to an inspection line. 2. A mold for sucking the hydrated paper-formed product is moved to a lower die on a rotary table by turning in a horizontal plane, and the hydrated paper-made product is sequentially supplied to the lower die. The method for producing a paper-molded article according to claim 1, wherein the movable upper mold and the lower mold are rotated at the same timing, and the mold is heated and dried while being heated. 3. The hydrated paper-molded product is provided with a plurality of fixed upper and lower dies corresponding to the shape of the paper-formed molded product, the upper dies being movable on the fixed table, and the upper dies are rotated on a tact-rotating rotary table. Transfer to dry molding with the same number of lower dies, and heat and press successively at multiple heating stations while heating to optimize the gaps between the upper and lower dies in response to shrinkage due to drying of the molded product. The method for producing a paper-molded article according to claim 1. 4. The method according to claim 1, wherein the mold having sucked the water-containing molded article is moved to a lower mold on a rotary table by linear movement to sequentially supply the molded article in the mold to the lower mold. The method for producing a paper-molded article according to claim 1. 5. The hydrated papermaking molded product is transferred from the transfer device to the heating lower die in order to transfer it from the papermaking molding process to the dry molding process, and is simultaneously pressed and dried in a state sandwiched between the mobile transfer device and the lower die. 2. The method according to claim 1, wherein
3. The method for producing a paper-molded article according to item 1. 6. A press ratio of 0% to 50% with respect to the paper thickness of a hydrated paper-formed product in which the clearance between the lower dead center of the transfer die and at least the flat part of the lower die in the same station is dried.
5. The control device according to claim 4, wherein:
The production method described in 1. 7. The production method according to claim 4, wherein the pre-drying is carried out by sandwiching between the transfer device and the lower mold, and the water vapor is sucked and discharged from the mold at the same time. 8. A papermaking molding mechanism for obtaining a papermaking component from a raw material of the papermaking molded article, dewatering the papermaking component by a mold-drying apparatus for producing a papermaking molded article, and drying the papermaking molding. An apparatus for producing a sheet-formed article having a dry-forming mechanism for dry-forming; the dry-forming mechanism corresponding to the shape of the molded article, and rotating the upper and lower dies movable up and down at the same timing by intermittent drive. An apparatus for producing a paper-molded article, comprising a drying step which is placed on a table, clamped while heating, and hot-pressed. 9. The drying molding mechanism corresponds to the shape of a molded product, and a fixed table is provided with a plurality of upper dies capable of moving vertically and fixedly on a fixed table, and the upper dies are mounted on a rotary table operated by intermittent driving. It has a lower mold having the same number of stations, and comprises a drying step of optimizing the gaps of the upper and lower molds at a plurality of heating stations in response to shrinkage due to drying of the molded product while heating and sequentially heating and pressing. An apparatus for manufacturing a paper-molded article according to claim 8. 10. The drying molding mechanism corresponds to a molded product shape, and an upper die capable of moving vertically and fixedly is arranged at a plurality of stations on a fixed table, and the upper die is mounted on a rotary table operated by intermittent drive. It has the same number of lower dies as the number of stations, and it is moved from the transfer device to the heating lower die to transfer the formed paper from the papermaking mechanism to the drying and forming mechanism, and at the same time, pressurized while being sandwiched between the transfer device and the lower die. The apparatus for producing a paper-formed article according to claim 8, wherein the apparatus is dried. 11. A clearance between the bottom dead center of the transfer die and at least a flat portion of the lower die in the same station is controlled so as to be a press ratio of 0% to 50% with respect to the paper thickness of the wet product to be dried. The manufacturing apparatus according to claim 10, wherein: 12. The manufacturing apparatus according to claim 10, wherein the apparatus is sandwiched between a transfer apparatus and a lower mold, and is pre-pressurized and pre-dried. 13. In order to transfer the hydrated paper-made molded article from the papermaking molding mechanism to the dry-molding mechanism, simultaneously transfer the hydrated paper-made molded article from the moving transfer device to the heating lower mold from the molding die to the drying mold. Pressure drying in a state of being sandwiched between the transfer device and the lower mold, at the time of finish drying, transfer the water-containing paper-formed molded product after suction dehydration to a pair of molds that engage with each other, and mold the mold so as to have a predetermined clearance. 11. The manufacturing apparatus according to claim 10, wherein heating and drying are performed while controlling the position.