JP2002248641A - Press compression method for heating press molding compound and pressing device used therein - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently mass-produce a heating press molding compound, to enhance heat efficiency to reduce running cost and to rapidly and efficiently cool a molded heating press molding compound. SOLUTION: In the press compression method for the heating press molding compound, the heating press molding compound W is pressed in a mold 1 and heated and pressed under a temperature and pressure condition capable of performing hydrothermal molding in a hermetically closed state to be hydrothermally molded. Further, in the pressure compression method, the mold 1 is arranged in a pressure control chamber 6 capable of being hermetically closed airtightly and capable of being opened and closed and pressure gas containing steam such as air, nitrogen gas, carbon dioxide or the like is introduced into the pressure control chamber 6 under pressure to pressurize the pressure control chamber 6 to predetermined pressure and, in this state, the heating press molding compound W is heated and pressed in the mold to be hydrothermally molded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for pressing a hot-pressed material to be formed by pressing in a pressurized airtight chamber in a heated state with a molding die, and a press apparatus used for this method.

[0002]

2. Description of the Related Art Heat-press molding materials are materials that can be formed using water and heat, such as hydrogen bonding and hydrothermal synthesis.
Specifically, inorganic raw materials such as cement and calical materials,
Examples include cellulose raw materials such as paper pulp and the like, woody raw materials, and organic raw materials such as plastics. A more specific example of use is, for example, by performing tobermorite generation by hydrothermal treatment with a calcium silicate material under physical compression, it is possible to produce a high-strength molded product by densification,
And it can be used for civil engineering and construction purposes as an inorganic molding material. In addition, by molding cellulose fibers such as paper pulp under hydrothermal conditions, molding utilizing the shape memory effect of cellulose becomes possible, and dry molding of paper pulp which does not require an adhesive is possible. Can be used for functional materials. Further, by physically compressing the woody raw material or the like under hydrothermal conditions in a pressurized state, recombination and plastic deformation processing can be performed. In this case, after the hydrothermal treatment, rapid cooling enables precise molding in a short time. Further, it can also be used for drying while restraining wood. Further, by forming an organic material such as plastic under hydrothermal conditions, decomposition and synthesis of various materials can be performed simultaneously.

[0003] The present inventor has developed an apparatus that can be used for this purpose (Japanese Patent No. 3002197). As shown in FIG. 1, the apparatus includes a hot plate 21 that presses the hot-pressed material W in an airtightly sealed state, a pressing mechanism 22 that presses the hot plate 21 against the hot-pressed material W, A heating mechanism for heating the hot plate 21 to a predetermined temperature; Further, the press device includes an airtight closed chamber 23 formed inside the hot plate 21.
A pressurized gas source 24 for supplying a pressurized gas to which water vapor is not added, such as air, nitrogen gas, or carbon dioxide gas, is connected. The pressurized gas source 24 presses the pressurized air into the closed chamber 23 and pressurizes the closed chamber 23 to a predetermined pressure with the heated and pressed molding W in the closed chamber 23 pressed by the hot plate 21.

This apparatus presses both sides of a hot-pressed material W with a hot plate 21 and heats and presses the hot-pressed material W in a closed chamber 23 to a temperature and pressure at which hydrothermal forming is possible. Further, a gas such as air, nitrogen gas, carbon dioxide gas, or the like is press-fitted into the closed chamber 23 that heats and pressurizes the heat-pressed molding material W, and pressurizes the closed chamber 23 to a predetermined pressure to perform heat-press molding. The material W is hydrothermally formed.

[0005]

In this apparatus, it is necessary to hermetically seal the inside of the apparatus while the hot plate presses the hot-pressed material. If it cannot be airtightly sealed, the internal pressure cannot be increased and the heat-pressed molding cannot be hydrothermally molded. However, in order to always keep the inside of the hot plate in a state where the hot press molding material is pressed, not only the processing accuracy of the hot plate but also the amount of the hot press molding material to be filled in the molding chamber is extremely high. Need to be filled with. For example, if the filling amount of the hot-pressed material is too large, the inside cannot be completely hermetically sealed while the hot plate is pressed. For this reason, the apparatus having this structure has a drawback that it is difficult to always operate in an ideal state, and it is difficult to efficiently mass-produce the apparatus.

[0006] This disadvantage can be solved by a structure in which a mold is provided in a tubular autoclave which is hermetically sealed. In this apparatus, high-temperature and high-pressure steam is supplied into the kettle to raise and raise the temperature, and presses and molds with a molding die arranged here while applying a physical compressive force in the kettle. . In this apparatus, since the molding die is arranged in an airtightly sealed autoclave, there is no need to hermetically seal the inside while the molding die is pressed, eliminating the adverse effects of the device shown in FIG. it can. However, this device has the disadvantage that the thermal efficiency is very poor. This is because the heating and pressing molding material is heated while heating the entire large autoclave pot that is not necessary for the heat treatment. Even when high-temperature and high-pressure steam is supplied into the autoclave pot, if the steam contacts a low-temperature portion, the steam is liquefied, the volume shrinks, and the water is covered. In other words, in order to increase the pressure to the same pressure as the supplied steam, it is necessary to raise the temperature of the entire inside of the autoclave pot, which is extremely large as compared with the heated and press-formed material, to the same temperature as the supplied steam.

[0007] Autoclave kettles have an extremely large heat capacity compared to the weight of the heat-pressed material, and thus have the disadvantage that the heat efficiency of steam to heat the heat-pressed material is extremely poor. Furthermore, when heating and pressurized molded material is heated in an autoclave kettle, and then cooled and removed from the mold, it takes a long time to cool the large kettle, and furthermore, a huge amount of heat generated in this process There is also the disadvantage of losing heat energy. Therefore, there is a disadvantage that a large amount of steam is consumed in order to heat the autoclave pot in the next step.
Thermal efficiency is further degraded.

When a mold is placed in an autoclave pot, it is actually very difficult to arrange a cylinder for pressing the mold in the pot, and the cylinder rod is passed through the pot in an airtight manner. Need to be done. However, since the autoclave pot is heated to a considerable high temperature and the internal pressure also increases, the sealing material between the cylinder rod and the pot is extremely difficult, and in reality it can be used under high temperature and high pressure conditions. There is almost no. For this reason,
The leak between the rod of the cylinder and the shuttle cannot be sufficiently prevented, and the leak of steam from this portion cannot be eliminated. This also causes the steam to not be used effectively and lowers the thermal efficiency.

Furthermore, in the apparatus for heating the inside of the autoclave pot with steam, the temperature and pressure cannot be set independently and optimally independently from the relationship between temperature and pressure. For example, when the temperature in the autoclave pot is set to about 180 ° C., the pressure is specified to be about 900 kPa. For this reason, there is also a disadvantage that when the heating and pressing molding is heated and pressed in a pressurized state, the temperature and pressure cannot be set to optimal values for the heating and pressing molding.

[0010] The present invention has been developed with the object of solving such disadvantages. An important object of the present invention is to efficiently and mass-produce a hot-pressed material, to reduce the running cost by increasing the thermal efficiency, and to make the formed hot-pressed material quickly efficient if necessary. An object of the present invention is to provide a method for press-compressing a hot-pressed material which can be well cooled and a press apparatus used for this method.

[0011]

According to the present invention, there is provided a method for press-compressing a hot-pressed material, wherein the hot-pressed material W is pressed by a molding die 1 and the heated-pressed material W is sealed in a closed state. Is heated and pressurized to a temperature and pressure at which hydrothermal molding can be performed. Further, according to the method of the present invention, the molding die 1 is disposed inside a pressure control chamber 6 that can be hermetically sealed and can be opened and closed. A pressurized gas is injected to pressurize the pressure control chamber 6 to a predetermined pressure.
And hot-pressed.

The above method preferably employs a pressure control chamber 6
Is held in a pressurized state, the heating and pressing molding material W is heated and pressed by the molding die 1, and then the heating and pressing molding material W is cooled by the molding die 1 and demolded.

Further, according to the press compression method of the present invention, in the step of cooling the hot-pressed molding material W by the mold 1, the pressurized gas in the pressure control chamber 6 is exhausted or the pressure in the pressure control chamber 6 is reduced. Thereby, the hot-pressed molding material W can be quickly cooled. In addition, in the method of the present invention, both sides of the heat-pressurized molding material W can be pressed by the molding die 1 in a heated state.

According to a sixth aspect of the present invention, there is provided a press apparatus for press-forming a hot-press formed material, a pressing mechanism for pressing the formed die 1 against a hot-press formed material, A heating mechanism for heating the mold 1 to a predetermined temperature. Further, in the press apparatus for a heat-pressed molded material, the molding die 1 is disposed in a pressure control chamber 6 provided in a pressure-resistant container 3 which can be hermetically sealed and can be opened and closed. 6 is connected to a pressurized gas source 7 for supplying a pressurized gas to which water vapor such as air, nitrogen gas, carbon dioxide gas or the like is not added.
A state in which the pressure control chamber 6 is pressurized with pressurized air while the molding die 1 heats and presses the hot-pressed molding material W in the pressure control chamber 6 and the pressure control chamber 6 is maintained at a predetermined pressure. Then, the heat-pressurized molding material W is heated and pressed by the molding die 1 and molded.

In the above press apparatus, the pressing mechanism 2 of the molding die 1 is a cylinder 9, and the rod 9A of the cylinder 9
Can be passed through the pressure-resistant container 3 in an airtight manner, and the molding die 1 can be pressed. Further, the mold 1 can incorporate a heating mechanism and a cooling mechanism. The pressure control chamber 6 can be connected to a pressurized gas source 7 and a vacuum pump 14. This apparatus pressurizes the pressure control chamber 6 with the pressurized gas source 7 and presses the heating / pressing molding material W in a heated state. W can be cooled.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. However, the following examples illustrate a method of press-compressing a hot-pressed material to embody the technical idea of the present invention and a press apparatus used in this method. The equipment is not specified as:

Further, in this specification, in order to make it easy to understand the claims, the numbers corresponding to the members shown in the embodiments will be referred to as "claims" and "claims". In the column of “means”. However, the members described in the claims are not limited to the members of the embodiments.

FIG. 2 shows a press apparatus for a hot-pressed material W. A press 1 for pressing both sides of the hot-pressed material W in an airtight manner, , A heating mechanism (not shown) for heating the mold 1 to a predetermined temperature, a pressure-resistant container 3 forming a pressure control chamber 6 capable of hermetically sealing the mold 1, and a pressure-resistant container An opening / closing cylinder 5 for opening and closing the pressure-resistant container 3, a lower lid 4 for hermetically closing a lower opening of the pressure-resistant container 3, and a pressure control chamber 6 of the pressure-resistant container 3 without adding steam such as air, nitrogen gas, and carbon dioxide gas. A pressurized gas source 7 for supplying a pressurized gas.

The molding die 1 shown in the figure comprises an upper molding die 1A, a lower molding die 1B and a peripheral wall 1C, and a peripheral wall 1C is arranged around the upper molding die 1A and the lower molding die 1B. The inner shape of the peripheral wall 1C is equal to the outer shape of the upper molding die 1A and the lower molding die 1B, and the upper molding die 1A and the lower molding die 1B are slid inside the peripheral wall 1C to form the upper molding die 1A and the lower molding die 1B. The heat-pressurized molding material W is compressed and press-molded in a region surrounded by the molding die 1B and the peripheral wall 1C. The peripheral wall 1C has a shape surrounding the upper molding die 1A and the lower molding die 1B, for example, a square shape. This mold 1 includes an upper mold 1A and a lower mold 1B.
Although the molding chamber is formed by the and the peripheral wall 1C, the peripheral wall may be formed into a shape integrated with either the upper molding die or the lower molding die. Further, a peripheral wall is disposed between the upper mold and the lower mold, and the peripheral wall is sandwiched between the upper mold and the lower mold, and is surrounded by the upper mold, the lower mold, and the peripheral wall. The heat-pressed material can be compressed and pressed in the region to be heated.

The pressing mechanism 2 is a hydraulic cylinder 9 connected to the upper mold 1A. Hydraulic cylinder 9
Presses down the upper mold 1A and presses the hot-pressed material W in the pressure control chamber 6. The lower mold 1B includes a lower lid 4
It is fixed horizontally on top. The hydraulic cylinder 9 has an upper end fixed to the frame 8 in a vertical posture, a rod 9A penetrating the pressure-resistant container 3 in an airtight manner, and a lower end of the rod 9A is connected to the upper mold 1A. Through-hole 3A of pressure vessel 3
Is provided with a ring groove 10 on the inner surface and a packing 11
Has been put. This packing 11 is used for the hydraulic cylinder 9.
The airtightness is improved by sliding the rod 9A. The device of the present invention does not need to heat the inside of the pressure-resistant container 3 with steam or the like, unlike an autoclave pot. Therefore, it is not always necessary to use the packing 11 having excellent heat resistance.

As shown in the drawing, the structure in which the hydraulic cylinder 9 of the pressing mechanism 2 is disposed outside the pressure-resistant container 3 can reduce the internal volume of the pressure-resistant container 3. For this reason, the pressure control chamber 6 can be pressurized to a high pressure by reducing the amount of pressurized gas supplied to the pressure-resistant container 3. However, the pressing mechanism can be arranged inside the pressure-resistant container.

Further, the pressing mechanism 2 shown in FIG.
Although the hydraulic cylinder 9 is connected to A, the hydraulic cylinder can be connected to the upper and lower molds, or the hydraulic cylinder can be connected to the lower mold. Further, the pressing mechanism does not necessarily need to use a hydraulic cylinder.
The pressing mechanism can press the mold with a cam or a crank mechanism, for example. These pressing mechanisms are arranged inside the pressure-resistant container and press the molding die.

Further, the mold 1 is heated to a predetermined temperature by a heating mechanism. The heating mechanism heats the mold 1 with, for example, steam or a heater. Mold 1 heated by steam is
A passage for passing steam is provided inside. The mold 1 heated by a heater has a built-in heater heated by electricity. However, the present invention does not specify the heating mechanism of the mold 1 as steam or a heater. The heating mechanism may be any mechanism capable of heating the hot-pressed material, for example, directly heating the hot-pressed material at a high frequency.

The temperature at which the heating mechanism heats the mold 1 depends on the type of the heat-pressed material W.
It is set at 20-500 ° C. The temperature of the molding die 1 is set to an optimum temperature in consideration of the material of the heating and pressing molding material W. When the temperature of the molding die 1 decreases, the time for hydrothermal molding of the heat-press molding material W increases. If the temperature of the mold 1 is too high, there is a problem that the surface of the hot-pressed material W pressed in a heated state is scorched or deformed. Therefore, the temperature of the molding die 1 is set to an optimum value in consideration of the time during which the hot-pressed material W can be hydrothermally formed and the type of the hot-pressed material W.

For example, the temperature of the mold 1 is set to 180 ° C., the internal pressure of the pressure control chamber 6 is set to 900 kPa, and the cedar can be hydrothermally formed in 6 minutes. When the internal pressure of the pressure control chamber 6 and the processing time are the same and the temperature of the mold 1 is set to 160 ° C., the treated cedar is slightly restored by boiling in hot water. However,
Even if the temperature of the mold 1 is set to 160 ° C., the cedar can be hydrothermally formed by increasing the treatment time. Therefore, the temperature of the mold 1 is set to an optimum value in consideration of the type of the heat-pressed molding material W to be processed and the processing time.

The pressure-resistant container 3 is large enough to accommodate the mold 1 in the internal pressure control chamber 6 and has an open lower part. The illustrated pressure-resistant container 3 has a cylindrical shape with an upper surface closed, has a flat lower surface, and is airtightly adhered to the upper surface of the lower lid 4 when lowered. The lower lid 4 is provided with a fitting groove 4A for the packing 12 at a position where the lower end surface of the pressure-resistant container 3 comes into contact, and the packing 12 is inserted and fixed therein. The packing 12 of the fitting groove 4A is in close contact with the lower end surface of the pressure-resistant container 3 that has been lowered,
The pressure control chamber 6 is hermetically closed without gas leakage.

The pressure vessel 3 is moved up and down by an opening / closing cylinder 5 fixed vertically to the frame 8. When the opening / closing cylinder 5 lowers the pressure-resistant container 3, the pressure control chamber 6 is closed airtightly. When the opening / closing cylinder 5 raises the pressure-resistant container 3, the pressure control chamber 6 is opened.

The pressure vessel 3 is provided with a through hole 3B for connecting the pressurized gas source 7. This through-hole 2B has a pipe 13
, The pressurized gas source 7 and the vacuum pump 14 are connected. The pressurized gas source 7 supplies a pressurized gas such as air, nitrogen gas, or carbon dioxide gas to which no steam is added to the pressure control chamber 6 to pressurize the pressure control chamber 6 to a predetermined pressure.

The apparatus for supplying pressurized air to the pressure control chamber 6 uses a compressor as the pressurized gas source 7. The compressor pressurizes air and presses it into the pressure control chamber 6. The air supplied from the compressor to the pressure control chamber 6 is heated by the molding die 1 to increase the pressure. Therefore, the compressor can supply air at a pressure lower than the set pressure for pressurizing the pressure control chamber 6 to set the pressure control chamber 6 at the set pressure.

The apparatus for supplying nitrogen gas or carbon dioxide gas to the pressure control chamber 6 uses, as the pressurized gas source 7, a gas cylinder filled with nitrogen gas or carbon dioxide gas under high pressure. The gas cylinder supplies nitrogen gas or carbon dioxide gas at a predetermined pressure to the pressure control chamber 6 to pressurize the gas to a set pressure. The device that supplies nitrogen gas to the pressure control chamber 6 has a feature that oxidation during processing can be prevented. Carbon dioxide gas easily permeates the hot-pressed molding material W and dissolves in the moisture in the hot-pressed molding material, so that there is a feature that the drying ability is improved. Further, a processing agent such as an antiseptic or an insect repellent may be added to the gas supplied to the pressure control chamber 6 to form the heat-pressed molding material W by hydrothermal molding. In this state, the hot-pressed material W hydrothermally molded
Can be preserved or insect-proofed in the treatment step.

The pressurized gas source 7 pressurizes the pressure control chamber 6 to a pressure of, for example, 100 kPa to 20 MPa. The pressure of the pressure control chamber 6 is set to an optimum value depending on the type of the heat-pressed material W. In the case where the heat-press molding material W is a cellulose material such as wood or paper pulp, or a wood-based wood pulp, 500 kPa
To 2.5 MPa, preferably 600 to 2 MPa, more preferably 700 to 1.5 MPa. The internal pressure of the pressure control chamber 6 is set lower or higher than the saturated vapor pressure corresponding to the heating temperature of the molding chamber 1. Further, if the internal pressure of the pressure control chamber 6 is too low, the hot press molding material W cannot be hydrothermally formed in a short time. That is, when the internal pressure of the pressure control chamber 6 is low, the moisture contained in the heated and pressed molding W heated in the molding die 1 boils, taking a large amount of vaporization heat from the surroundings, and This is because the inside cannot be heated uniformly. Therefore, the internal pressure of the pressure control chamber 6 is preferably set to a pressure at which moisture contained in the heated and pressed molding W heated by the molding die 1 does not evaporate. However, lowering the internal pressure is also effective for high-temperature drying of wood and the like. Water is
Boils at about 180 ° C. at a pressure of 900 kPa. Therefore, when setting the temperature of the mold 1 to 180 ° C.,
The set pressure of the pressure control chamber 6 is set to 900 kPa or more. In this state, the heating and pressing molding material W heated to the molding die 1
In this method, the surface in contact with the molding die 1 is heated to approximately 180 ° C., but the temperature inside the heating and pressing molding material W becomes 180 ° C. or less, and the moisture contained in the heating and pressing molding material W does not boil.
The water in the heat-pressed molding material that does not boil conducts the heat of the surface to the inside without cooling the hot-pressed molding material W by the heat of vaporization and heats the whole to around 180 ° C. The heat-pressed material W heated without boiling the water therein is quickly conducted, and uniformly heated to the inside. This is because the thermal conductivity of water is five times greater than that of wood, so that heat is conducted to the inside through water having good thermal conductivity.

The vacuum pump 14 reduces the pressure in the pressure control chamber 6 and cools and dries the heated and pressed material W. Vacuum pump 1
The device for decompressing the pressure control chamber 6 at 4 has the features that the demolded hot-pressed material W can be dried to a lower moisture content and cooled and taken out.

In the apparatus shown in FIG. 2, an atmosphere release valve 15 and a pressure control valve 16 are also connected to the pressure control chamber 6. The atmosphere release valve 15 is closed when the pressure control chamber 6 is pressurized and depressurized. The valve is opened when the pressurized gas in the pressure control chamber 6 is exhausted, or when outside air is sucked into the depressurized pressure control chamber 6. The pressure control valve 16 opens when the pressure in the pressure control chamber 6 becomes higher than the set pressure, and adjusts the pressure in the pressure control chamber 6 to the set pressure.

The press apparatus shown in FIG. 2 hydroforms the hot-pressed material W in the following steps. [Step of Supplying Heating and Pressing Molding Material Between Molds] The molding die 1 is opened with the pressure-resistant container 3 open, and the heating and pressing molding material W is supplied between the molding dies 1. The hot-pressed material W is supplied to the mold 1 without drying. The ideal moisture content of the heat-pressurized molding material W supplied to the molding die 1 is 8 to 200%, preferably 10 to 100%.
%, More preferably 10 to 50%. In this specification, the water content means the ratio of the weight of water to the dry weight.

[Step of Airtightly Sealing and Pressurizing the Pressure Control Chamber] The pressure-resistant container 3 is lowered by the opening / closing cylinder 5, and the pressure control chamber 6 is airtightly closed. Thereafter, the on-off valve 17 connected between the compressor as the pressurized gas source 7 and the pressure control chamber 6 is opened to supply pressurized air. About 700 kPa of air is supplied to the pressure control chamber 6. However, the air pressure supplied to the pressure control chamber 6 may be set to a pressure of 500 Pa to 1 MPa when the pressure control chamber 6 is heated. When opening the on-off valve 17 connected to the compressor, the on-off valve 18 connected to the vacuum pump 14
Then, the atmosphere release valve 15 and the pressure control valve 16 are closed.

[Step of Pressing the Mold] The mold 1 is heated to a predetermined set temperature, the upper mold 1 is lowered by the hydraulic cylinder 9, and both surfaces of the heated and pressed molding material W are placed on the upper and lower molds. Heat and press in 1 to compress. When the heat-press formed material W is wood, for example, it is compressed to 80% of the original thickness.
However, the molding die 1 contains 30 to 99% of the hot-pressed molding material W,
Preferably 45-95%, more preferably 50-95%
Can also be compressed to%.

[Step of Consolidating Heated and Pressed Molding Material in Pressure Control Chamber] The air supplied to the pressure control chamber 6 is
, And expands to raise the internal pressure of the pressure control chamber 6 to the set pressure. When the internal pressure of the pressure control chamber 6 becomes higher than the set pressure, the air release valve 15 is opened to adjust the internal pressure of the pressure control chamber 6 to the set pressure. In this state, in the pressure control chamber 6, the hot-pressed material W is processed in a state where it is pressed in a heated and pressurized state and hydrothermally formed. This processing time
Although the optimum value differs depending on the type of the heat-pressed material W, for example, in the case of cedar, it is set to about 6 minutes. Wood, which is a heat-pressed material having a higher density than cedar, such as hinoki, requires a longer processing time. Further, when the water content of the heat-pressed material W is low or when the temperature of the mold 1 is low, the processing time is lengthened.

[Step of Depressurizing the Pressure Control Chamber to Cool and Dry the Heated and Pressed Molded Material] Open the atmosphere release valve 15 to discharge air from the pressure control chamber 6 and reduce the internal pressure to atmospheric pressure. . In this state, the water contained in the hot-pressed material W boils, is vaporized and evaporated, and is removed. The heating and pressing molding material W is cooled by the heat of vaporization in which the moisture inside boils. Further, the temperature of the pressure control chamber 6 is also lowered by adiabatic expansion of air.

[Step of depressurizing the pressure control chamber to further cool and dry] After closing the atmosphere opening valve 15, the vacuum pump 1
4 is operated to depressurize the pressure control chamber 6. In this state, the hot-pressed material W is further dried and cooled. After the temperature of the heating and pressing molding material W has dropped to the set temperature, the upper molding die 1A is raised, and the heating and pressing molding material W is taken out of the pressure control chamber 6.

As described above, when the hot-pressed material W is hydrothermally formed, the hot-pressed material W can be sufficiently dried, cooled, and taken out. However, the method of the present invention
After the pressure control chamber is opened to the atmosphere, the pressure-pressurized container and the mold can be opened without depressurizing the pressure control chamber, and the heat-pressed molding material can be released.

In the above method, the heating and pressing molding material W is heated by the molding die 1, but the heating and pressing molding material heated by a steam pot or the like is supplied to the molding die 1 before being supplied to the molding die 1. You can also. Further, in the above method, the pressure control chamber is pressurized by the molding die in a pressurized state, but the pressurization of the pressure control chamber and the pressing of the molding can be performed at an arbitrary timing. For example, in the apparatus shown in FIG. 1, the closed chamber can be pressurized only in a pressed state, but the apparatus of the present invention shown in FIG. 2 is a hot-pressed material softened under hydrothermal pressure that pressurizes the pressure control chamber. Can be pressed to make it denser.

In the above embodiment, since the heat-pressed material W is made of wood, the heating temperature is set to 180 ° C.
Is about 1 MPa, but when the heating and pressing molding material W is an inorganic material, for example, the heating temperature can be 300 ° C., and the pressure in the pressure control chamber 6 can be about 9 MPa.

Further, the apparatus shown in FIG. 2 is capable of cooling and solidifying and removing residual stress by rapidly cooling the mold under a pressurized state. And it is possible to control the internal pressure and the cooling independently, and it is also possible to cool without changing the water content by cooling in a high pressure state.

[0044]

EFFECTS OF THE INVENTION The press compression method and press apparatus of the present invention can efficiently produce a large amount of hot-pressed material,
It has the advantage of increasing thermal efficiency and reducing running costs. That is, the press compression method and the press apparatus of the present invention are arranged inside a pressure control chamber that can be hermetically sealed and can be opened and closed by pressing and molding a heat-pressed molding material. This is because a pressurized gas is pressurized and pressurized to a predetermined pressure, and the pressurized and formed material is formed by hot pressing with a forming die in a state where the pressure control chamber is pressurized. As described above, the press compression method and the press apparatus in which the molding die is disposed inside the pressure control chamber that can be hermetically sealed, and the pressure control chamber is pressurized and the hot-pressed molded material is heated and pressed by the molding die, The molding die can always be hermetically sealed without making the processing accuracy of the molding and the amount of the heat-pressed molding material to be filled into the molding chamber high. For this reason, it can always be operated in an ideal state, and mass production can be performed efficiently.

Further, according to the press compression method and the press apparatus of the present invention, a pressurized gas such as air, nitrogen gas, carbon dioxide gas or the like is added to a pressure control chamber, and the pressure control chamber is pressurized to a predetermined pressure. Since pressure is applied, the loss of energy can be extremely reduced as compared with a conventional press apparatus in which a molding die is disposed in an autoclave pot and high-pressure and high-pressure steam is supplied to pressurize the pot. In particular, since the pressure control chamber can be pressurized without heating the entire pot in which the mold is disposed, a significant reduction in heating energy can be realized. Furthermore, since only the mold can be heated and heated and pressed without heating the pressure vessel, there is a feature that the thermal efficiency can be increased, the running cost can be reduced, and the processing time can be greatly reduced.

Further, according to the press compression method and the press apparatus of the present invention, the molding die is disposed inside the pressure control chamber.
It has the feature that the internal pressure of the pressure control chamber and the heating temperature of the mold can be controlled separately and independently. For this reason, when heating and pressing a molded article under heating and pressing, the temperature and pressure can be set to optimal values for the heated and molded article, and processing under various conditions becomes possible.

Further, the press compression method according to the second aspect of the present invention and the press apparatus according to the seventh aspect are characterized in that the hot press molded material heated and pressurized can be cooled quickly and efficiently by cooling it with a molding die. There is. This is because the mold can be cooled in a state where the mold is in direct contact with the heat-pressed material.

Further, in the press compression method according to the third aspect of the present invention and the press apparatus according to the eighth aspect, the pressurized gas in the pressure control chamber is exhausted, or the pressure control chamber is depressurized to form the heated and pressed material. Since the cooling is performed, there is a feature that the heating and pressing molding material can be cooled while drying to a lower moisture content.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a press device previously developed by the present inventors.

FIG. 2 is a schematic sectional view of a press device according to an embodiment of the present invention.

[Explanation of symbols]

1: Mold 1A: Upper mold 1
B: lower molding die 1C: peripheral wall 2: pressing mechanism 3: pressure-resistant container 3A: through hole 3
B ... Through hole 4 ... Lower lid 4A ... Fitting groove 5 ... Opening / closing cylinder 6 ... Pressure control chamber 7 ... Pressurized gas source 8 ... Frame 9 ... Cylinder 9A ... Rod 10 ... Ring groove 11 ... Packing 12 ... Packing 13 ... Piping DESCRIPTION OF SYMBOLS 14 ... Vacuum pump 15 ... Atmosphere release valve 16 ... Pressure control valve 17 ... On-off valve 18 ... On-off valve 21 ... Hot plate 22 ... Pressing mechanism 23 ... Sealed chamber 24 ... Pressurized gas source W ... Heating and press forming material

Claims (9)

[Claims] 1. A heating and pressing molding material (W) is pressed by a molding die (1), and the heating and pressing molding material (W) is subjected to hydrothermal treatment in a closed state and subjected to hydrothermal molding at a temperature and pressure capable of performing hydrothermal molding. In the method of performing hydrothermal molding by heating and pressurizing, a molding die (1) is disposed inside a pressure control chamber (6) that can be hermetically sealed and can be opened and closed, and air is supplied to the pressure control chamber (6). A pressurized gas such as nitrogen gas, carbon dioxide gas, or the like, to which water vapor is not added, is pressurized and the pressure control chamber (6) is pressurized to a predetermined pressure. Press-compressing method for a hot-pressed material, wherein the hot-pressed material is subjected to hydrothermal molding by hot pressing. 2. The heat and pressure molded material (W) has a water content of 8 to 2
2. The method of press-compressing a hot-pressed material according to claim 1, wherein the pressure is set to 00%. 3. The pressure control chamber (6) is maintained in a pressurized state,
2. The heating and pressing molding material (W) is heated and pressurized by a molding die (1), and then the heating and pressing molding material (W) is cooled and demolded by the molding die (1).
Press compression method of a heat-pressed molding material described in the above. 4. The method according to claim 1, wherein in the step of cooling the hot-pressed molding material (W), the molding die (1) exhausts the pressurized gas in the pressure control chamber (6) or depressurizes the pressure control chamber (6). Item 4. A method for press-compressing a heat-pressed material according to item 3. 5. The method according to claim 1, wherein the molding die (1) presses both surfaces of the hot-pressed material (W) in a heated state. 6. A molding die (1) for pressing and molding a hot-pressed molding material (W), and a pressing mechanism (2) for pressing the molding die (1) against the hot-pressed molding material (W). A pressure control chamber (6) provided in a pressure-resistant container (3) that can be hermetically sealed and can be opened and closed in a press apparatus for a hot-pressed material having a heating mechanism for heating the mold (1) to a predetermined temperature. A pressurized gas source that supplies a pressurized gas, such as air, nitrogen gas, or carbon dioxide gas, to the pressure control chamber (6) of the pressure vessel (3). (7)
In the state where the molding die (1) heats and presses the hot-pressed material (W) in the pressure control chamber (6) and presses it, the pressure control chamber (6)
Pressurizing the heated and pressurized molding material (W) with a molding die (1) while maintaining the pressure control chamber (6) at a predetermined pressure. A press machine for hot and pressed moldings. 7. The pressing mechanism (2) of the mold (1) is a cylinder.
7. The press apparatus for a hot-pressed material according to claim 6, wherein in (9), the rod (9A) of the cylinder (9) is hermetically penetrated through the pressure vessel (3). 8. The press apparatus according to claim 6, wherein the molding die (1) includes a heating mechanism and a cooling mechanism. 9. A pressurized gas source (7) and a vacuum pump (14) are connected to the pressure control chamber (6), and the pressure control chamber (6) is pressurized by the pressurized gas source (7). After pressing the hot-pressed material (W) in a heated state, the pressure control chamber (6) is depressurized by a vacuum pump (14) to cool the hot-pressed material (W). Item 9. A press device for a hot-pressed material according to item 8.