JP4783863B1 - Water content correction dehydration method of veneer raw veneer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method that can carry out dehydration while correcting the variation of the water content ratio when the water contents are squeezed from a plurality of green veneers. <P>SOLUTION: A laminate green veneer of a four square pillar shape is provided by laminating many sheets of the green veneers for the veneer up and down formed in a square form with a high water content rate. The laminate aggregate is located between upper and lower board members so that two side faces of the laminate green veneers opposing mutually may form the small sum aggregate surface of the vertical direction. Further, the laminate green veneer is pressed by carrying out relative approach movement of the upper and lower board members, a cut end surface of the green veneer for each veneer and an internal fiber extends to an original form direction, enters a state of the negative pressure by releasing or alleviating the pressure power applied to the laminate green veneer in a state where the water extruded from each cut end surface by the pressure goes along the small sum aggregate surface of the vertical direction and dripping downward, the suction from the small cut end surface to the inside is caused by the negative pressure, and water is absorbed in the fiber of the green veneer which is relatively low in the water content rate in the fiber. As a result, dehydration is carried out while correcting the variation of the water content to be small. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  This invention is a state in which a plurality of raw veneers for plywood are laminated vertically, and the moisture content of the laminated raw veneer is reduced by pressing and compressing the laminated raw veneer in the vertical direction. It is related with the moisture content correction | amendment dehydration method of the raw veneer board for veneer boards which decreases.

  In the process of manufacturing a plywood board, the raw wood board is cut into a thin strip shape with a race (claw) while rotating the raw wood, and the strip-like stripping material is cut into a predetermined size to obtain a raw veneer board. After drying, a plurality of sheets are often joined to form a plywood board. However, if the raw veneer is directly dried, it takes time to dry. Therefore, prior to drying, the raw veneer is pressurized to squeeze the water (dehydrate).

  It is desirable to make the water content as uniform as possible between a plurality of laminated green veneers and between the areas of a single green veneer after the dewatering drawing of the green veneer. If there is a large variation in the moisture content, it will take extra time for subsequent drying, and it will be difficult to achieve uniform drying. For this reason, the moisture content between each single veneer or one single veneer area after drying If the variation is not eliminated and a plurality of single plates are laminated to form a veneer in that state, warping and distortion are likely to occur.

  When comparing the sapwood from which the outer layer of the raw wood is peeled off and the core material from which the central part is peeled off, there is a large gap in the moisture content of the raw veneer before drawing. For example, the moisture content of the sapwood reaches 2 to 3 times that of the core material having a low moisture content. In addition, in the case of connecting the incomplete material that does not become a single plate by itself to make a correction single plate, in a combination of the core part and the sap part, the moisture content is 2-3 times between the areas of one correction single plate. Differences in rates can occur. Furthermore, even with a single raw veneer, there may be a difference in moisture content exceeding several tens of percent at different sites.

JP 2002-166403 A JP 2010-197004 A

  As a prior art, Patent Document 1 discloses a roller-type squeezing device that squeezes the moisture of a green veneer when each green veneer travels while sequentially narrowing pressure between squeezing rollers. However, since each single veneer is squeezed one by one, the overall process time becomes longer, and the individual green veneers are equally compressed between the rollers, thus correcting the variation in moisture content between the veneers. Does not occur.

  Patent Document 2 discloses a dewatering and drawing device of a stacked batch compression method that presses and squeezes a raw veneer in a stacked state from above. In this method, the compression efficiency is improved because the compression is performed collectively, but the effect of correcting the variation in the moisture content between the single plates or between the regions of one single plate cannot be expected.

  It is an object of the present invention to provide a method capable of squeezing a raw veneer while dehydrating it while correcting the moisture content variation when squeezing water from a plurality of raw veneers.

Means for Solving the Problems and Effects of the Invention

The present invention provides a rectangular raw green veneer by laminating a plurality of veneer green veneers formed in a rectangular shape with a high water content, and the fibers of each veneer green veneer. The laminated green veneers are arranged on the upper and lower plates so that the edge surfaces intersecting the direction are aligned in the vertical direction, and the two opposite side surfaces of the laminated green veneer form a vertical edge collecting surface. By placing the upper and lower board members relatively close to each other between the members, a plurality of laminated veneer raw veneers, which are the laminated raw veneer, are pressed, and each veneer The moisture of the veneer is pushed out from each small face so that the water will drip downward along the small face collecting surface in the vertical direction which is a collection of the small face of each veneer raw veneer,
In addition, in this state where the water is dripped, the pressing force applied to the laminated green veneer is released or relaxed, so that the small surface of each veneer green veneer and the internal fibers spread in the original shape direction to generate a negative pressure. As a result, the negative pressure causes a suction action from the small edge surface to the inside, and the moisture content in the fiber is relatively low in water content in the veneer raw veneer fiber, and the small edge aggregate surface is transmitted to the fiber. The water that moves downward is sucked so that the difference in moisture content between the veneer green veneers in the laminated green veneer and the portion of the water content between regions of any one veneer green veneer The moisture content of the laminated green veneer as a whole is reduced while correcting to reduce the difference.

  In this way, the laminated green veneer is pressed (pressed) between the upper and lower panel members to squeeze the moisture, and the moisture is dripping along the small face (vertical wall) of the laminated green veneer. Furthermore, by releasing or relaxing the pressure applied to the laminated green veneer, the compressed laminated green veneer expands due to its own elasticity, and at that time, negative pressure is generated in the veneer fiber, and the negative The dripping moisture is sucked into the fibers of the green veneer by the pressure. As a result, the water squeezed from the veneer or region having a high moisture content moves to the raw veneer or region thereof having a relatively low moisture content, and the moisture content varies between the raw veneers or between the veneer regions. It is dehydrated while being corrected to be smaller. Therefore, the subsequent drying can be performed efficiently in a relatively short time, and further, when joining a plurality of veneers to make a veneer, variation in moisture content is between veneers and between veneer areas. Because of its small size, it is difficult for warp and distortion to occur in products made of plywood.

  Further, according to the present invention, the water that is squeezed by the pressing is applied to the laminated green veneer by the upper and lower board members, and the water squeezed by the pressing is dripped downward along the small edge collecting surface in the vertical direction. It is characterized by being repeated several times in the state.

  In this way, the water squeezed from the veneer or region having a relatively high moisture content moves to the raw veneer or region thereof having a relatively low moisture content, and is compressed again by re-pressurization to produce fibers. In order to reduce the moisture content variation between raw veneers or veneer areas more effectively by extruding moisture inside, in other words, exhaling, sucking, and repeating exhaling and sucking It can be dehydrated while correcting.

BRIEF DESCRIPTION OF THE DRAWINGS The front view which shows simply and conceptually an example of an apparatus suitable for implementation of the correction | amendment dehydration method of this invention. The front view corresponding to FIG. 1 which shows one process of the method based on this invention in connection with one action | operation of the apparatus. FIG. 3 is a similar front view of the operation and method steps following FIG. 2; Fig. 4 is a similar front view showing the operation and method steps following Fig. 3; FIG. 5 is a similar front view showing the operation and method steps following FIG. 4; Fig. 6 is a similar front view showing the operation and method steps following Fig. 5; FIG. 7 is a similar front view showing the operation and method steps following FIG. 6; FIG. 8 is a similar front view showing the operation and method steps following FIG. 7; FIG. 9 is a similar front view showing the operation and method steps following FIG. 8; FIG. 10 is a similar front view showing the steps of the method following the operation of FIG. 9; The top view which shows the process of the action | operation and method corresponding to FIGS. 4-5. The top view explaining the effect of FIG. FIG. 12 is another plan view for explaining the effect of FIG. 11. The simple front view explaining the effect of FIG. The front view of laminated raw veneer B1 which shows the effect | action corresponding to FIG. The side view of FIG. The perspective view of FIG. The conceptual diagram explaining the movement of the water | moisture content in laminated raw veneer B1. The top view which shows an example of a correction | amendment raw veneer. The top view which shows the movement of the water | moisture content of the correction | amendment raw veneer of FIG. The front view of FIG. 20A. The conceptual diagram explaining the mechanism of discharge | emission and suction | inhalation of the water | moisture content in the raw veneer corresponding to FIGS. The graph which confirms the effect by the correction | amendment dehydration method of this invention. The hydraulic system figure which shows an example of another apparatus suitable for enforcing the method of this invention. FIG. 24 is a control system diagram of FIG. 23. The typical front view which shows the action | operation containing a raising cylinder. The front view which shows the apparatus of FIG. 25 more concretely. The side view of FIG. The top view of the lower part of FIG. The schematic explanatory drawing which shows simply the action | operation of the lateral movement member and regulation member in FIGS. The front view corresponding to FIG. 1 which shows another apparatus used for implementation of the method of this invention. The front view which shows the process of following FIG. FIG. 32 is a front view showing a step following FIG. 31. The simple front view which shows the 1st example of the method of detecting the state which the water is dripping down. The front view which similarly shows the 2nd example. The front view which similarly shows the 3rd example. The front view which similarly shows the 4th example.

  Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings. First, a water content correction squeezing device suitable for carrying out the method of the present invention will be described, and then an embodiment of the method of the present invention will be described together with the description of the operation of the device. Figure 1 shows the moisture content of a laminated green veneer by reducing the moisture content of the laminated green veneer by pressing and compressing the laminated green veneer vertically in a state where a large number of green veneers are laminated vertically. This is a raw veneer dewatering squeezing device 1 to be reduced. The apparatus 1 includes a surface plate 2 that supports a laminated green veneer, a pressure plate 3 that is provided above the surface plate 2 and that can be moved toward and away from the surface plate 2, and a pressure plate 3. A pressure cylinder 4 that drives the platen 3 and presses it against the laminated green veneer, and is provided so as to be movable in the vertical direction with respect to the surface plate 2, and rises upward from the surface plate 2 to become a laminated green veneer. In contact with or in close proximity to at least two opposing vertical walls, restricting the movement or stretching of the laminated green veneer during pressurization by the pressurization plate 3, and the pressurization plate 3 in the downward stroke of the pressurization plate 3 A pair of restricting members 5 that are brought into contact with each other and then lowered integrally with the lowering of the pressure platen 3, and as an elevating means that lowers the restricting member 5 and raises it to the upright position. Control for controlling the lifting cylinder 6 and the pressure cylinder 4 for driving the pressure plate 3 And a pressurization control unit 7 as a stage. The surface plate 2 and the pressure plate 3 correspond to the upper limit plate member.

  The surface plate 2, the pressure cylinder 4 and the lifting cylinder 6 are fixed to the frame 8. The frame 8 is framed in a box shape, and the surface plate 2 is positioned so as to cross the frame 8 in the horizontal direction. One side of the surface plate 2 is connected to a carry-in conveyor 11 for carrying the laminated green veneer B1 into the surface plate 2, and the other side carries out the laminated green veneer B2 that has been dehydrated by compression drawing. A carry-out conveyor 12 is connected.

  The pair of restricting members 5 are planar (plate-like) members facing the vertical walls of two opposite sides of the laminated green veneer B1, and stand up parallel to each other. The green veneer is rectangular (usually rectangular), and the vertical walls of the two sides in particular are wall surfaces parallel to the fiber direction when the green veneer is distinguished from the fiber direction along the fiber and the fiber crossing direction. . Therefore, the pair of regulating members 5 face each other in the fiber crossing direction of the green veneer, and the end surfaces of the fibers of the green veneer are exposed in the direction orthogonal to the paper surface in FIG. This end surface becomes a fore edge gathering surface where the fore edges of each green veneer are gathered.

  As the lateral movement device that relatively moves one of the pair of regulation members 5 toward the other, lateral movement cylinders 13 and 13 are connected to each regulation member 5. Those laterally moving cylinders 13 are fixed to the elevating base 14 and the piston rods 15 thereof are connected to the respective regulating members 5. The pair of restricting members 5 protrude upward in a standing state through a moving space 16 formed on the surface plate 2, and can move in the horizontal direction with respect to the lifting base 14 while maintaining the standing state within the range of the moving space 16. . When at least one of the lateral movement cylinders 15 is driven to relatively move one of the regulating members 5 toward the other regulating member 5, the laminated green veneer B1 is moved from both sides in the direction intersecting the fiber direction. It will be sandwiched.

  Each elevating base 14 is connected to the piston rod 17 of the elevating cylinders 6, 6 installed in the vertical direction, and each regulating member 5 is connected to the elevating cylinder 6 via the elevating base 14 that supports the lateral movement cylinder 13. It becomes. Each elevating cylinder 6 has an upright position in which the upper end of each regulating member 5 protrudes upward from the surface plate 2 beyond the height of the laminated green veneer B1, and a retracted position pulled down below the upper surface of the surface plate 2. A vertical direction (not shown) having a sloke for raising and lowering each regulating member 5 between them, and guiding the raising and lowering of each regulating member 5 directly or indirectly through an accessory member integral with the regulating member 5 The guide part is provided. In FIG. 1, when only the regulating member 5 on the carry-in conveyor 11 side is in the retracted position submerged below the upper surface of the surface plate 2, the laminated green veneer B <b> 1 is loaded onto the platen 2, and at least the restriction on the carry-out conveyor 12 side. When the member 5 is in the retracted position below the upper surface of the surface plate 2, the laminated green veneer B <b> 2 after dewatering and drawing is carried out of the surface plate 2.

  The surface plate 2 incorporates a surface plate conveyor 20 that can be raised and lowered to the extent that it floats from the upper surface, and the conveyor 20 is supported and driven by, for example, sprockets 21 and 22 provided at both ends of the surface plate 2. It is a chain conveyor, and is moved to a transfer position slightly lifted from the upper surface of the surface plate 2 by an elevating device 23 (for example, an elevating cylinder) and a retreat position lowered below the upper surface. When the conveyor 20 is driven at the lifted transfer position, the stacked raw veneer B1 conveyed by the carry-in conveyor 11 is continuously guided further onto the surface plate 2 and lowered to the retracted position so that the stacked raw The single plate B1 is placed on the upper surface of the surface plate 2. The laminated green veneer B2 that has been dewatered and drawn is slightly lifted when the conveyor 20 in the platen is raised by the lifting device 23, and is conveyed from the platen 2 to the carry-out conveyor 12 side by the conveyor 20. It is delivered to the conveyor 12.

  The pressurizing control unit 7 that controls the pressurizing cylinder 4 is a pressurizing plate that is in the process of primarily pressurizing the laminated green veneer B1 with the pressurizing plate 3 while water is being discharged from the laminated green veneer B1. The primary pressurization stop means for controlling the pressurization cylinder 4 so that the primary pressurization is stopped by releasing or reducing the pressurization by 3, and the layered production for performing the secondary pressurization by the pressurization panel 3. Secondary pressurization starting means for controlling the pressurization cylinder 4 so that pressurization to the single plate B1 is resumed. Specifically, the pressurization control unit 7 includes at least a sequence program 25 executed by the CPU for controlling the pressurization pattern of the pressurization cylinder, and a timer 26 for measuring the pressurization and release time. Are connected to a pressure sensor 28 for detecting the pressure of the pressure cylinder 4, an electromagnetic valve 29 for controlling the fluid pressure (usually hydraulic pressure) to the pressure cylinder 29, and a pressure source such as a hydraulic pump 30 as necessary. The Here, the primary pressurization stop means and the secondary pressurization start means are configured including the sequence program 25 and the timer 26.

  Next, the operation of the above dewatering and drawing apparatus 1 will be described. A part of this explanation is the contents of the sequence program 25 of the pressurization control unit 7 and an explanation of an embodiment of the moisture content correction dehydration method according to the present invention.

  First, when the laminated green veneer B1 is conveyed by the carry-in conveyor 11 in FIG. 1, the lifting member 6 is moved to the retracted position below the upper surface of the surface plate 2 as shown in FIG. On the other hand, the regulating member 5 on the carry-out conveyor 12 side is maintained in a standing state up to a position exceeding the height of the laminated green veneer B1.

  Next, the inside platen conveyor 20 in FIG. 1 is driven, and the laminated green veneer B1 is transferred from the carry-in conveyor 11 to the inside platen conveyor 20, and the laminated green veneer B1 is fixed as shown in FIG. Located on the board 2. At this time, the cylinder 20 in the platen is slightly lifted from the platen 2, and the laminated green veneer B <b> 1 is in a floating state by the conveyor 20. Thereafter, the regulating member 5 that has been lowered below the surface plate 2 is lifted by the lifting cylinder 6 as shown in FIG. 4, to a position that is equal to or slightly higher than the height of the laminated green veneer B <b> 1 from the surface plate 2. Protruding state.

  From this state, as shown in FIG. 5, the regulating member 5 on the transport conveyor 11 side moves laterally so as to approach the opposite regulating member 5 side by a lateral movement cylinder 13 by a small distance. As a result, the vertical wall, which is one side in the fiber direction of the laminated green veneer B1, approaches the inner surface of the regulating member 5 on the opposite side or approaches the other side, and the other side that is also parallel to the fiber. In a state where a certain vertical wall hits the inner surface of the regulating member 5 moved laterally, the laminated green veneer B1 is sandwiched between the pair of regulating members 5 from both sides. Thereafter, the conveyor 20 in the platen of FIG. 1 is lowered to a position lower than the platen 2 by the elevating device 23, so that the laminated green veneer B1 is seated on the upper surface of the platen 2 and placed there.

  Thereafter, as shown in FIG. 6, the pressure platen 3 is lowered by driving the pressure cylinder 4. In the descending process, the pressure plate 3 comes into contact with the upper ends of the pair of regulating members 5 protruding upward from the upper surface of the laminated green veneer B1. Since the driving pressure of the pressurizing cylinder 4 is larger than the pressure (holding pressure) of the elevating cylinder 6 of the regulating member 5, after the contact, the pressure cylinder 4 pushes down the piston of the elevating cylinder 6 and a pair of regulating members. Push 5 back down.

  As shown in FIG. 7, when the pressure platen 3 hits the upper surface (the uppermost raw veneer) of the laminated green veneer B1 in the process, the pressurization / compression on the laminated green veneer B1 starts, The pressure platen 3 continues to pressurize the laminated green veneer B1 for a predetermined time while driving the pressure cylinder 4 to sink the pair of regulating members 5 downward.

  The laminated green veneer B1 is compressed in the vertical direction by the pressurization, and its height is reduced to some extent, and each green veneer is separated from the end surface in the fiber direction of the green veneer (front vertical wall in FIG. 7 and the like). Moisture present inside is pushed out and droops so as to drip. Under this condition (in the middle of throttling), the drive of the pressure cylinder 4 is stopped as shown in FIG. 8, and the pressure applied to the laminated green veneer B1 of the pressure plate 3 is released (the pressure is made zero), or Reduce pressure to low pressure. This is a stop of the primary pressurizing step while the drooping of water is continuing.

After the pressurization stop is continued for a short time, as shown in FIG. 9, the process proceeds to a secondary pressurization step in which the pressurization cylinder 4 is redriven and the pressurization panel 3 repressurizes the laminated green veneer B1.
After the secondary pressurization process is continued for a predetermined short time, the dewatering squeezing for the laminated green veneer B1 is finished, or the water pushed out from the fibers of the green veneer by the secondary pressurization is dripped. It is possible to appropriately select whether to stop the secondary pressurization in a state where it hangs down and then shift to the tertiary pressurization step, after the Nth pressurization (N is an integer of 2 or more) is completed. As shown in FIG. 10, the pressurizing cylinder 4 is driven back, and the pressurizing plate 3 is lifted to be separated from the upper surface of the laminated single plate B <b> 2 after dewatering and drawing and the upper ends of the pair of regulating members 5.

  In this state, at least the regulating member 5 on the discharge conveyor 12 side is lowered by the elevating cylinder 6 to a retreat position where the upper end is below the upper surface of the surface plate 2. Further, the conveyor 20 in the surface plate in FIG. 1 is lifted by the lifting device 23, the laminated single plate B <b> 2 after dewatering and drawing is lifted from the surface plate 2 to be transported by the conveyor 20, and the conveyor 20 is driven. The laminated green veneer B2 moves from the surface plate 2 and is run to the carry-out conveyor 12, and is carried out to a predetermined place.

  The operation of the pressurizing cylinder in the Nth pressurizing process as described above is controlled by executing the sequence program 25 in the pressurizing control unit 7 of FIG. Therefore, the timer 26 becomes an element for determining the pressurization duration and pressurization release time of each pressurization step, and the time measured by the timer 26 is the pressurization continuation and pressurization release set in the sequence program. When the time is reached, a signal is sent from the pressurization control unit 7 to the electromagnetic valve 29 and, if necessary, the pressurization source 30, and the operation of the pressurization cylinder 4 is stopped or restarted. When both the pressure of the pressurizing cylinder 4 obtained from the pressure sensor 28 and the time by the timer 26 are used as parameters for determining the pressurization continuation and pressurization release timing, the measured pressure and time When the pressure becomes within a preset value or range, the pressurization is continued or released by the AND condition or the OR condition.

  As shown in the plan view of FIG. 11, the stacked raw veneer B <b> 1 is sandwiched between the pair of regulating members 5 by the lateral movement of one regulating member 5 of FIGS. 4 to 5. This naturally suppresses or prevents the movement of the laminated green veneer B1 in the pressurizing step, such as tilting or collapsing, but as shown in FIG. 12, the direction intersecting the fiber direction of the green veneer In the state in which the laminated green veneer B1 is sandwiched from both sides, the elongation (stretching) of the end portion of the green veneer, particularly in the fiber crossing direction accompanying pressurization, is suppressed or prevented.

  If free extension of this end portion is allowed, the fiber-oriented crack is likely to occur in the raw veneer end portion (which can be said to be the end portion of the laminated green veneer B1) as shown in FIG. As shown in FIG. 14, the elongation and the cracking can be prevented by the pair of regulating members 5.

  FIGS. 15 to 18 and FIG. 21 show the situations that occur in response to the execution and stop of the primary pressurization process of FIGS. 7 to 8 and the start and execution of the secondary pressurization process leading to FIG. Shown in concept (image). As shown in FIGS. 15 and 16, when the laminated green veneer B1 is pressed and compressed in the primary pressurizing step, moisture is pushed out from the fiber inside each green veneer, and the vertical direction of the laminated green veneer B1. Dripping down the wall. FIG. 21A conceptually shows a state before pressurization, and FIG. 21B conceptually shows a state during pressurization. When the pressurization is released under the condition where the moisture hangs down (including pressure relaxation), as shown in (b) to (c) of FIG. It swells to return, thereby generating a negative pressure on the fibers inside the green veneer, and hangs down the wall surface of the laminated green veneer B1 or sucks moisture remaining on the wall surface into its own fibers. This negative pressure / suction action is more prominent in the raw veneer or the same region having a low moisture content than the raw veneer or the same region having a higher moisture content from the beginning.

  Therefore, as shown in FIGS. 17 and 18, from a raw veneer having a high water content to a lower raw veneer between the fibers of each laminated green veneer b1 and between the fiber regions of one green veneer. Moreover, the movement of moisture occurs from a region having a high moisture content in one green veneer to another region having a low moisture content. In other words, the moisture content in the entire laminated green veneer B1 tends to become more uniform due to the negative pressure pumping action of the green veneer itself due to the release of pressure performed while moisture is being pushed out.

  Here, it is considered that there is little variation in moisture content within one raw veneer, but incomplete material that cannot be used as a raw veneer with one piece (for example, a hollow, a node, an outer peripheral part of a raw wood when the raw wood is peeled off) In order to make effective use of the stripped material, such as holes or tears in the stripped material due to the unevenness of the stripped material, etc.), a plurality of incomplete materials are joined together with tape etc. to form a correction veneer However, this may be used as a material for a plywood board in the same way as a normal single board. For example, a correction veneer b11 shown in FIG. 19 connects a cedar slab (external layer stripping material) A, a red (intermediate layer stripping material) B, a slab material C, and a core material (central stripping material) D. However, the sapwoods A and C having a high moisture content and the low core material D have a difference in moisture content of about 2 to 3 times, and the lean B has a difference in intermediate moisture content. Therefore, due to the negative pressure pump action due to the pressurization / release / pressurization cycle, a large amount of moisture moves between areas where there is a difference in moisture content in one correction veneer b11, which is one correction veneer. It leads to the uniform moisture content in b11. Moreover, even if it is not a correction veneer but a single raw veneer, for example, a difference in moisture content of 20 to 150% may occur in different parts of the cedar raw veneer. Alleviated.

  The effect of equalizing the moisture content as described above increases as the release of pressure is repeated while water is being pushed out of the raw veneer by pressurization, so primary pressurization, pressurization under water outflow Release, secondary pressurization, pressurization release under water outflow, tertiary pressurization, pressurization release under water outflow, and so on, cause multiple pump action (negative pressure suction action) It is desirable.

  However, in consideration of increasing the dewatering efficiency by shortening the process time of the dewatering and drawing process, the number of repetitions of the pressurization and depressurization and the time of the dewatering and drawing required for one laminated green veneer B1 must be balanced. It will be planned. In that case, in order to shorten the dewatering squeezing time as much as possible, the dewatering squeezing for one laminated green veneer B1 may be completed in a minimum of three steps of primary pressurization, release of the same pressurization, and secondary pressurization. Is the law.

  FIG. 22 is a graph for explaining the effect of dewatering drawing (particularly, the effect of equalizing the residual moisture content after drawing) on the laminated green veneer B1 described above. For example, in the dewatering drawing test performed on the sapwood by the above method, as shown in A1, the initial moisture content (before dewatering drawing) is about 100% with a low water content and about 300% with a high water content. The difference range was 203% after dehydration by this dewatering squeeze as in A2, but the range of variation in moisture content after drying following dehydration as in A3. Fell to 5%.

  Regarding the cedar core material, as in B1, the initial moisture content (before dehydration) was low at about 50% and high at about 150%, and the difference in water content was 99%. Similarly, after dehydration, this was reduced to 70% like B2, and after drying, the variation in moisture content was kept at 7% like B3.

Next, another embodiment of the present invention will be described with reference to the apparatus shown in FIGS.
In the apparatus used in this embodiment, as is apparent from the hydraulic system diagram of FIG. 23, a plurality (four in this example) of pressure cylinders 50 that pressurize the laminated green veneer B1 from above are pressurized. The cylinders 50 are connected to a pressurizing plate 51 as a member, and each cylinder 50 is connected to a hydraulic source 53 (compressor, hydraulic pump, or the like) via a respective electromagnetic valve 52. In addition, a plurality of (for example, four on each side of the pressure plate 51, a total of four) pulling cylinders 54 are connected to the pressure plate 51 so as to be parallel to the pressure cylinder 50 and outside the pressure cylinder 50. These pulling cylinders 54 are connected to a hydraulic pressure source 53 via a common electromagnetic valve 55. As shown in FIG. 24, the electromagnetic valves 56 of the plurality of pressurizing cylinders 50 are connected to a controller (hydraulic control unit) 57, and the electromagnetic valves 55 of the plurality of pulling cylinders 54 are also connected to the controller 57.

  As shown in FIG. 25, each pulling cylinder 54 has a linear encoder 58 incorporated therein or attached as a measuring means for measuring the stroke (operation) distance (extension distance of the piston rod 54a). Connected to. When the pressure cylinder 50 extends to press the stacked green veneer B1 via the pressure plate 51, the four pulling cylinders 54 follow the lowering of the pressure plate 51 and the piston rod 50a In the course of the extension, stroke distances (extension distances of the piston rod 54 a) L 1, L 2, L 3, L 4 of each pulling cylinder 54 are measured by each linear encoder 58, and the measurement output is sent to the controller 57.

  The controller 57 determines the deviation ΔL or the inclination Δθ as much as possible by the difference (deviation ΔL) of the output values of the encoders 58 or by the three-dimensional inclination Δθ of the pressure plate 51 calculated from the deviation ΔL of the output values. In order to eliminate this, each solenoid valve 52 (FIGS. 23 and 24) of each pressurizing cylinder 50 is controlled, and the operating pressures P1 to P4 of each pressurizing cylinder are individually controlled. Thereby, the inclination of the pressure board 51 with respect to the laminated green veneer B1 is corrected. As this premise, each piston rod 54a of each pulling cylinder 54 in FIG. 25 is connected to the pressure plate 51 in a state in which relative rotation (within a small angle) is allowed. The piston rod 50a of the pressurizing cylinder 51 can have a structure that hits the pressurizing plate 51 via a hooking portion or the like (not shown).

  When pressurization and throttling of the laminated green veneer B1 by the pressurization cylinder 50 is completed and the pressurization platen 51 is raised to the ascending end position, the pressurization cylinder 50 is not driven and only a plurality of pulling cylinders 54 are used. By actuating (supplying fluid pressure from the pressure source 53 via the electromagnetic valve 55), the pressurizing platen 51 is pulled up to the rising end position (original position). At this time, the plurality of pressure cylinders 50 follow the operation of the pulling cylinder 54 and the piston rods 50a thereof contract. When the pressurizing plate 51 is pulled up, it is sufficient to have a force sufficient to lift the pressurizing platen 51 and it is sufficient to apply a cylinder pressure that overcomes the weight of the pressurizing platen 1. In this case, a large pressure is required to drive a heavy piston. However, if this is performed by a pulling cylinder 54 having a lower output and smaller than the pressurizing cylinder 50, it can be easily applied with a small cylinder pressure and with low energy. The platen 51 can be pulled back to the original position.

  Moreover, such a pulling cylinder 54 is extended following the driving of the pressurizing cylinder 50 (the pressurization of the pressurizing plate 51), and each stalk is plotted by each encoder 58, so that the deviation ΔL or the slope Δθ can be set as a parameter. As a result of individually controlling each pressurizing cylinder 50, the tilt at the time of pressurization of the pressurizing plate 51 is corrected using the pulling cylinder 54 without adding a special mechanism, and as a result, the laminated green veneer B1 Uniform dehydration is possible while keeping the height level.

  26 and 27 show the positional relationship between the pressurizing cylinder 50 and the pulling cylinder 54 more specifically. The pressurizing cylinder 50 is fixed to the inside of a frame 60 which is a fixing member of the apparatus, and the pulling cylinder 54 is fixed to the frame 60 on its outer side. In FIG. 27, the piston rod 54a of the pulling cylinder 54 is connected to the pressure plate 51 by a pin 54b (for example, in a state where it can be rotated two-dimensionally or three-dimensionally by at least one of the X axis and the Y axis). .

  As shown in FIG. 26, the upper surface of the surface plate 61 becomes the support surface 61a of the stacked green veneer B1 to be placed, and a chain conveyor (intra-plate conveyor) 62 is provided in parallel with the support surface 61a. The conveyor 62 has two rows of endless tracks (for example, chains) 63 provided so as to be hidden directly below the support surface 61a, and cyclic sprockets 64 and 65 that support the chain 63 so as to be capable of circulating, and loads acting on the chain 63. Receiving a plurality of support sprockets 66, a conveyor frame 67 that supports the sprockets 64 to 66, a motor 68 that is supported by the frame 67 and that drives the chain 63, and the above-described components are entirely frame 67. And a conveyor lifting cylinder 69 that moves up and down.

  As shown in FIG. 28, a chain groove (slit) 70 through which the chain 63 passes is formed on the upper surface (support surface 61 a) of the surface plate 61, and each of the two rows 63 of chains 63 is fixed in the chain groove 70. It is moved up and down by a conveyor lifting cylinder 69 between a transport position supported somewhat higher than the upper surface of the board 61 and a standby position retracted from the upper surface. In the process of pressurizing the laminated green veneer B1, the chain 63 is in the retracted position, and when the laminated green veneer B1 is loaded onto the surface plate 61 and unloaded from the surface plate 61, the chain 63 is a conveyor. It is lifted to the transfer position by the lifting cylinder 69. A transmission shaft (sprocket) 71 shown in FIG. 26 is provided to rotate the two rows of chains 63 synchronously, and the rotation of the motor 68 is transmitted to the sprockets 65 and 71 through a transmission mechanism such as a chain. Thus, the chains 63 are driven in synchronization.

  In FIG. 26, the regulating member 72 that regulates the positions of the two opposite sides (two surfaces) of the laminated green veneer B1 is laterally provided in a vertical position as schematically shown in FIG. The member 73 is supported by an elevating guide 74 so as to be elevable in the vertical direction. An elevating cylinder 75 that raises and lowers the regulating member 72 is fixed to the lateral movement member 73, and its piston rod 75 a is connected to the regulating member 72. The lateral movement member 73 is supported by the frame 60 of the apparatus via a lateral movement cylinder (lateral movement mechanism) 76, and the operation of the lateral movement cylinder 76 causes the regulation member 72, the lateral movement member 73, and the lifting cylinder 75 as a whole to be lateral. Move in a certain distance range in the direction (horizontal direction).

  Further, by the operation (extension) of the elevating cylinder 75, the regulating member 72 is raised while being guided by the elevating guide 74 of the laterally moving member 73, and as shown in FIG. The positions of the two opposing end faces of the raw veneer B1 are restricted. At this time, as shown in FIG. 29, the regulation member 72 is moved in the horizontal direction by the lateral movement cylinder 76 via the lateral movement member 73, so that the floating laminated single plate supported by the chain conveyor 62 is provided. B1 is sandwiched between the two regulating members 72.

  FIG. 28 is a plan view specifically showing the schematic configuration of FIG. 29 in actuality. In addition, although it has shown paying attention to the element in the position where the up-down direction differs in the right and left of this figure, you may think that an actual apparatus is left-right symmetric. Since the chain 63 of the above-described chain conveyor 62 is positioned on the raising / lowering locus of the regulating member 72, the regulating member 72 has a vertical clearance groove (slit) 77 that avoids interference with the chain 63 in the raising / lowering stroke of the raising / lowering member 72. It is formed for a sufficient length. Further, laterally moving cylinders 76 are fixed to the frame 60 before and after the surface plate 61 in the depth direction so as to protrude outward from the frame 60 of the apparatus, and laterally moving members that stand upright on these cylinders 76. 73 are connected.

  The regulating member 72 is positioned inside the lateral movement member 73, that is, between the member 73 and the frame 60, and supported by the lateral movement member 73 via the elevation guide 74 so as to be movable up and down. Move left and right. On the left side of FIG. 28, although not shown, there is a lateral movement cylinder 76 as in the right side, and the same operation is performed. A lateral movement guide 78 shown on the left side of the surface plate 61 connects the frame 60 and the lateral movement member 73 at a height position different from that of the lateral movement cylinder 76 before and after the depth direction of the surface plate 61. It functions as a linear guide that guides movement in the left-right direction in the figure. Although not shown on the right side of FIG. 28, there is a similar lateral movement guide for guiding the horizontal movement of the lateral movement member 73 on the right side.

  As shown in FIG. 27, the restricting member 72 is constituted by a rectangular pipe material or the like in a frame shape, the vertical frame portions 79 and 80, the horizontal frame portions 81 and 82 connecting the upper and lower sides thereof, and the frame members 79 to 80. 82, or a plate portion 83 that closes the space, and the above-described escape grooves (slits) 77 in the up-and-down direction are formed in the vertical frame portions 79 and 80 corresponding to the two rows of chains 63, respectively. The piston rod 75a of the elevating cylinder 75 fixed to the lateral movement member 73 is connected to the lower surface of the upper vertical frame portion 81.

  In addition, as shown in FIG. 27, the raising / lowering of the pressurization board 51 is guided by the raising / lowering guide 82 formed in the flame | frame 60. As shown in FIG. Here, a pair of upper stoppers 51a (stopper portions) are provided on the lower surface of the pressure plate 51 at inner intervals corresponding to the outer intervals of the pair of restricting members 72 (the length thereof is, for example, as shown in FIG. 72), when the pressure platen 51 descends and hits the upper ends of the pair of restricting members 72, the pair of upper stoppers 51a are very close to the outer side surfaces of the restricting members 72, and when pressed, It is possible to prevent the regulating member 72 from opening outward.

  Also in the above embodiment, in principle, as in the embodiment described with reference to FIGS. 1 to 21, the left restricting member 72 protrudes from the surface plate 61 and the right restricting member 72 extends from the surface plate 61 in FIG. 26. In the retracted state, the laminated raw veneer B1 is carried to the surface plate 61 by the chain conveyor 62 driven by the motor 68, and then the right regulating member 72 is protruded from the surface plate 61. When the regulating member 72 is laterally moved to the left regulating member 72 side by the lateral movement cylinder 76, the laminated green veneer B1 is sandwiched between these regulating members 72, and in this state, the conveyor lifting cylinder 69 is moved to the chain conveyor. By lowering 62, the laminated green veneer B1 is placed on the upper surface (support surface) 61a of the surface plate 61.

  Next, after the pressure cylinder 50 is driven and the pressure plate 51 descends and comes into contact with the upper ends of the pair of regulating members 72, the pressure plate 51 moves the regulating members 72 downward by driving the pressure cylinder 50. While pushing back, the laminated green veneer B1 is compressed to squeeze the moisture contained therein. In this process, the stroke distances L1 to L4 of the plurality of pulling cylinders 54 following the pressure cylinder are plotted, and the height of the laminated green veneer B1 is horizontal so that the pressure plate 51 does not tilt. The plurality of pressurizing cylinders 50 are individually controlled so as to be maintained.

  And when the pressing force of the pressurizing cylinder 50 is released or relaxed, the fiber tube of each green veneer turns into a state of expansion from the compressed state, and a negative pressure is generated in the fiber tube of the laminated green veneer B1. Moisture that hangs down along the vertical wall is sucked into a relatively low moisture content portion or raw veneer, so that the moisture content is more uniform in the raw veneer and in the entire laminated raw veneer B1. Is done. Moreover, since the regulating member 72 regulates the elongation of the terminal portion in the direction intersecting with the fibers of the raw veneer, cracking at the end portion is suppressed.

  When the dehydration to equalize the moisture content is completed by performing pressurization and release (or depressurization) by the pressurizing cylinder 50 an appropriate number of times (for example, about 1 to 3 times), both regulating members 72 in FIG. The chain conveyor 62 is lowered by the lifting cylinder 75 to the lower end position, and the chain conveyor 62 is lifted by the conveyor lifting cylinder 69 to lift the dehydrated laminated green veneer B2 from the support surface 61a of the surface plate 61 and is driven by the motor 68. The chain conveyor 62 unloads the laminated green veneer B2 from the surface plate 61. Thereafter, the process for dehydrating the next laminated green veneer B1 is repeated.

  Also in the above Example, the effect which reduces the dispersion | variation in a moisture content as shown in FIG. 22 was acquired.

  The devices shown in FIGS. 1, 25, 26, and the like include the regulating members 5, 72, the elevating cylinders 6, 75 for raising and lowering the regulating members 5, 72, the laterally moving cylinders 13, 76 for laterally moving, and the pulling cylinder 74. The dewatering and throttling method using this apparatus is pressed from above in a state where the laminated green veneer B1 is sandwiched between the regulating members 5 and 72. As shown in FIG. A simple dewatering and squeezing device 1 ′ mainly composed of a surface plate 2 and a pressure plate 3, which does not include elevating cylinders 6 and 75 for moving up and down the regulating members 5 and 72, laterally moving cylinders 13 and 76 for moving horizontally, and a pulling cylinder 54 Other configurations are the same as those shown in FIGS. 1, 25, 26, etc., and the method of the present invention can be implemented.

  When this apparatus 1 'is used, after the laminated green veneer B1 is placed on the surface plate 2, as shown in FIG. 31, the pressure plate 3 is lowered by the pressure cylinder 4 and the laminated green veneer. Press B1. While the moisture is pushed out from the small edge surface of the laminated green veneer B1 by the pressing (pressurization) and dripping down, the pressurization of the pressure cylinder 4 is released or depressurized, whereby the laminated green A negative pressure is generated on the small-mouthed surface of the single plate B1, and the water dripping downward is sucked into the fiber, and then, as shown in FIG. 32, preferably, a second pressurization (secondary pressurization) is performed. Then, the laminated green veneer B1 is dehydrated while correcting so as to reduce the variation in moisture content. When this is finished, the pressure platen 3 returns to the ascending end position, the dehydrated laminated green veneer B2 is discharged, and the same dehydration process is performed on the next laminated green veneer B1.

  In the above embodiment, when the laminated green veneer B1 is pressed, moisture is pushed out, and in order to release or reduce the pressurization by the pressure plate 3 while the moisture is dripping, FIG. 30, for example, from experimental values carried out in advance, if it is within the time t1 from the start of pressurization as a rule of thumb, it is predicted that water is dripping, and at that time t1 Although the driving pressure of the pressurizing cylinder 4 is released or reduced using the time-up signal as a trigger, it is not limited to the timer 26.

  As shown in FIG. 33, instead of the timer, for example, an imaging camera 80 is installed in the vicinity of the small edge assembly surface (vertical wall) of the laminated green veneer B1, and video data of the camera 80 is transferred to the controller 7 (pressurization) If the data that the water hangs down from the image data, that is, the imaging (moving image) data that is displaced downward is extracted from the image data, the water pushed out by the pressurization hangs down. The pressurization control unit 7 can determine and supply a signal for releasing or reducing the drive pressure of the pressurization cylinder 4 to the pressurization cylinder 4 (strictly, an electromagnetic valve) while the drooping is continued. In addition, the water dripping down the side surface of the laminated raw veneer B1 is collected in the dredging member 82 through the water passage 81 formed in the surface plate 2 and the like, and is drained through the dredging member 82.

  Alternatively, as shown in FIG. 34, when a reflection sensor 83 such as an optical sensor is arranged facing the small edge assembly surface of the laminated green veneer B1, and the water is hanging, its water film, water droplets Alternatively, a reflected signal that returns from the reflection sensor 83 due to a water flow and is reflected by a water film or the like on the small edge assembly surface of the laminated green veneer B1 is sent to the pressure control unit 7, and the level of the reflected signal is transmitted by the pressure control unit 7. Is equal to or greater than a predetermined threshold value, it is determined that water is hanging down the small edge assembly surface of the laminated green veneer B1, and a signal for releasing or reducing the driving pressure of the pressure cylinder 4 is sent to the pressure cylinder. 4 solenoid valves.

  Furthermore, as shown in FIG. 35, in the state where at least one of the acoustic sensor 84 and the temperature sensor 85 is arranged in the vicinity of the small edge assembly surface (vertical wall) of the laminated green veneer B1, and water is dripping down. When the sound of dripping water is picked up, the output level of the acoustic sensor 84 becomes a predetermined value or more, and the temperature sensor 85 also holds the temperature change due to dripping of water or the output in the temperature range of a predetermined range. The drive pressure of the pressure cylinder 4 can be released or reduced by referring to at least one of the output signals of the acoustic sensor 84 and the temperature sensor 85.

  In addition, as shown in FIG. 36, the water dripping along the small gathering surface of the laminated raw veneer B1 is received by the container 86 through the water passage 81 of the surface plate 2, and the container for storing the water. An increase in the weight of the weight 86 is measured by a weight sensor (weight scale) 87, and if water is dripping, the weight of the container 86 for containing the water increases. Based on the signal from the weight sensor 87, the pressurization controller 7 determines whether or not the amount of water stored in the container 86 has increased. A signal for releasing or reducing the driving pressure to the pressure cylinder 4 is output so that the laminated green veneer B1 changes from compression to its original shape (expansion). Moisture absorption into the fiber It can be made to occur.

  In FIGS. 33 to 36 described above, detection means (80 to 87) for detecting the dripping of water is provided on each of the small edge collecting surfaces of the laminated green veneer B1 that face each other in parallel. However, it is also possible to provide such detection means (80 to 87) corresponding to only one of the edge gathering surfaces.

1 Dewatering and drawing device 2,61 Surface plate 3,51 Pressure plate (pressurizing member)
4,50 Pressure cylinder 5,72 Restriction member 6,75 Elevating cylinder (elevating means)
7,57 Pressure controller (control means)
8, 60 frame 11 carry-in conveyor 12 carry-out conveyor 13, 76 lateral movement cylinder (lateral movement means)
14 Lifting base 20 Cylinder in platen 25 Sequence program 26 Timer 28 Pressure sensor 29, 52 Solenoid valve 30, 53 Hydraulic pump (pressure source)
54 Pulling cylinder 58 Linear encoder 62 Chain conveyor (conveyor in the surface plate)
73 Horizontally moving member 74 Elevating guide 77 Escape groove (slit)
DESCRIPTION OF SYMBOLS 80 Imaging camera 83 Reflection sensor 84 Acoustic sensor 85 Temperature sensor 86 Water storage container 87 Weight sensor B1 Laminated green veneer B2 Laminated green veneer after dewatering drawing

Claims (2)

A plurality of veneer green veneers that are formed in a rectangular shape with a high water content are stacked one above the other to form a quadrangular columnar green veneer that intersects the fiber direction of each veneer green veneer. The laminated green veneers are arranged between the upper and lower plate members so that the edge surfaces that are the end faces are aligned in the vertical direction, and the two opposite side surfaces of the laminated green veneer form a small edge collecting surface in the vertical direction. By positioning and moving the upper and lower board members relatively close to each other, a plurality of laminated veneer raw veneers, which are the laminated raw veneers, are pressed, whereby the water content of each veneer raw veneer The water is pushed out from each small edge surface so that the water is dripped downward along the small edge collecting surface in the vertical direction, which is a collection of small edge surfaces of each veneer raw veneer,
In addition, in this state where the water is dripped, the pressing force applied to the laminated green veneer is released or relaxed, so that the small surface of each veneer green veneer and the internal fibers spread in the original shape direction to generate a negative pressure. As a result, the negative pressure causes a suction action from the small edge surface to the inside, and the moisture content in the fiber is relatively low in water content in the veneer raw veneer fiber, and the small edge aggregate surface is transmitted to the fiber. The water which moves downward is sucked, and thereby the difference in moisture content between each veneer raw veneer in the laminated green veneer and the partial difference in water content in the region of any one veneer green veneer. A moisture content correction dewatering method for a veneer raw veneer, characterized in that the moisture content of the laminated green veneer as a whole is reduced while being corrected to decrease.   The pressing and releasing or relaxation of the laminated green veneer by the upper and lower board members are repeated a plurality of times in a state where water squeezed by the pressing is dripping downward along the small edge gathering surface in the vertical direction. The moisture content correction | amendment dehydration method of the raw veneer board for plywood according to claim 1.