JP2001009809A - Manufacture of wood tray and manufacturing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably manufacture a wood tray free from cracks by applying an adhesive on the front face and the rear face of a core board, then temporarily stick fancy veneers, opposed to each other, on the front face and the rear face of the core board after drying and heating and compacting the tentative laminated board using a molding die, when the fancy veneers are laminated on the front face and the rear face of the core board and molded into a traylike form. SOLUTION: A core board loading machine 23 conveys a stack of long-size core boards loaded on a conveyor and a gluing machine 27 applies an adhesive to the front face and the rear face of the core board during conveyance and at the same time, a drying furnace 33 dries the adhesive. Next, the fancy veneers are temporarily attached, spaced from each other, using a hot stamper 43, against the front face and the rear face of the core board to form a temporary long-size laminated board and an area between the adjacent fancy veneers of the temporary long-size laminated board is cut using a sectional conveyor 61 into a plurality of temporary laminated boards. After that, the obtained temporary laminated boards are heated and compacted by using a molding die of a tray molding press 63 into a wood tray material and the outer shape of the wood tray is trimmed using a shaping machine 79 into a finished product.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for manufacturing a wooden tray in which, for example, a veneer obtained by slicing an external material, a laminated material of thinned wood, or the like is laminated and formed into a dish shape.

[0002]

2. Description of the Related Art Conventionally, a method for manufacturing a wooden tray is based on the fact that natural wood is precious and expensive, and in order to make effective use of thinned wood, a middle core plate made of sliced laminated wood such as thinned wood is used. The plate material of the front plate and the back plate made of the veneer bonded to the front and back surfaces is used. Then, adhesive is applied to both sides of the core plate, and the grain of the core plate and the top plate are laminated so that the grain of the back plate is orthogonal to each other, and heated and pressed, so that the core plate and the front plate are heated and pressed. Then, the back plate is integrally bonded to form a laminate. The laminated plate is mounted on a mold for forming a dish, and heated and pressed to form a wooden tray. In addition, the front plate and the back plate are superimposed on the front and back surfaces of the core plate, and without being heated and pressed in an undried state, immediately attached to a mold for forming the laminated plate into a dish shape, and heated and pressed. Sometimes a method of forming a wooden tray is used.

[0003]

However, the above conventional method has the following problems to be solved. (1) When a laminated plate in which the core plate, the front plate, and the back plate are bonded and cured is mounted on a mold and heated and pressed, the moisture content of the laminated plate becomes low (for example, 6% or less). In some cases, the wood trays used as products were cracked. (2) Further, when the core plate, the front plate, and the back plate are integrally bonded, they are not heated and pressed, but are heated and pressed after the laminate is mounted on the mold in a state where the adhesive is not dried. Due to the influence of the moisture of the adhesive (for example, the moisture content of the laminate is about 20%),
In some cases, molding time was prolonged, and air bubbles were generated between the core plate, the front plate, and the back plate, and peeling and cracking sometimes occurred in the wood tray that was a product. (3) Laminates are made by making the grain of wood thin at right angles to each other,
The process of mounting the laminate in a mold and heat-pressing to form a wood tray is complicated and requires a lot of labor and skill. The present invention has been made in view of such circumstances, and provides a method and an apparatus for manufacturing a wooden tray which can manufacture a wooden tray of stable quality without cracking, and which can be mass-produced and automated. With the goal.

[0004]

According to the present invention, there is provided a method for manufacturing a wooden tray according to the present invention, which comprises stacking veneers on the front and back surfaces of a core plate and forming a tray. After applying the adhesive to the front and back surfaces of the core plate and drying the adhesive applied to the core plate, a temporary laminated plate is formed by temporarily attaching the veneers to the front and back surfaces of the core plate so as to face each other, The temporary laminate is heated and pressed with a wooden tray forming die. Thus, in the state where the adhesive is applied to the core plate, the moisture content of the core plate is, for example, about 20% due to the influence of the moisture contained in the adhesive, but the molding die is used as a temporary laminated plate. For example, by drying at 70 to 110 ° C. before heating and pressing at a temperature of 70 to 110 ° C., the water content of the core plate evaporates to a water content of 10 to 15%. No air bubbles are generated between the back plates, and peeling or cracking does not occur in the wood tray as a product.

In the method for manufacturing a wooden tray according to the present invention, the core plate is made of a thin wooden plate, and the grain thereof is orthogonal to the front and back veneers, and the grain of the front and back veneers is the length of the wooden tray. It may face in the direction. In this case, cracks are less likely to be formed along the grain, and the quality of the wood tray can be stabilized. In the method for manufacturing a wooden tray according to the present invention, the core plate is made of a long material in which a plurality of veneers can be arranged, and the veneer plates are temporarily attached to the core plate at intervals to form a temporary long laminated plate. After the formation, the temporary laminate may be formed by cutting a space between adjacent temporary plates of the temporary long laminate.

In this case, since a long material is used for the core plate,
A gluing machine such as a roll coater capable of performing automatic continuous coating operation can be used. In addition, since a plurality of temporary plates can be transported to the tray forming press in a state in which a plurality of veneers are temporarily attached to the core plate, that is, a plurality of temporary laminates are connected, the transport is more efficient than when the temporary laminates are individually transported. be able to. In the method for producing a wooden tray according to the present invention,
The bottom of the dish-shaped wooden tray may be formed at an intermediate height by heating and pressing the temporary laminate with a wooden tray forming die.
Thereby, a strong wooden tray can be formed.

A wood tray manufacturing apparatus according to the present invention which meets the above object is a wood tray manufacturing apparatus for forming a tray by laminating veneers on the front and back surfaces of a core plate. A core plate loading machine for placing and transporting the stacked core plates on a conveyor, a gluing machine for applying an adhesive to the front and back surfaces of the core plates transported by the core plate loading device, and a core plate A drying oven that dries the adhesive while transporting the veneer, and a veneer that is adjacent to the front and back surfaces of the core plate that has been dried in the drying oven so that the grain of the veneer is orthogonal to the grain of the core, and the adjacent veneer A hot stamper that forms a temporary long laminate by temporarily attaching to each other at intervals, and cutting between adjacent veneers of the temporary long laminate while adsorbing and transporting each veneer temporarily attached to the core plate Transporting machine to divide the temporary laminate into a plurality of temporary laminates Having a tray forming press provided with a mold for forming a tray member, a shaping machine for trimming the outer shape of the wooden tray member. Thereby, from the process of applying the adhesive to the core plate of the long material, the veneer is temporarily attached to the core plate, and a tray-shaped wooden tray material is formed by a tray forming press,
It is possible to automate the manufacturing process from trimming the outer shape to a product as a wooden tray.

In the apparatus for manufacturing a wooden tray according to the present invention, the hot stamper includes a veneer transporter for adsorbing and transporting a veneer from a stocker on which a veneer is stacked onto a temporary mounting heater. A stacking prevention device for preventing taking out may be provided. This makes it possible to form a temporary long laminated plate by securely attaching the veneers one by one to the front and back surfaces of the core plate with a hot stamper, and to remove defective products in which a plurality of veneers are stacked on one side of the core plate. Formation can be prevented. In the wooden tray manufacturing apparatus according to the present invention,
The tray molding press may hold the upper mold and the lower mold of the mold so that they can float back and forth and right and left, respectively. In this case, even if the thickness of the core plate and the protruding plate adhered to the front and back thereof varies, the upper mold and the lower mold of the molding die float relatively, and the core plate and the protruding plate adhered to the front and back are laminated. Since it fits into the temporary laminated plate, the pressure is not locally applied due to the variation in the thickness of the veneer plate, and it is possible to prevent the wooden tray as a product from being cracked. In the apparatus for manufacturing a wooden tray according to the present invention, the shaping machine may include a punching press and a punching blade flexibly supported by the punching press via a spring. In this case, even if there is an error in the height of the progressive table or the thickness of the wood tray material, the spring is bent, the stroke of the punching press is automatically adjusted, and the punching blade can reliably punch the wood tray material. it can.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIG. 1 is a plan view showing the first half of the wood tray manufacturing apparatus according to the first embodiment of the present invention, FIG. 2 is a plan view showing the second half of the wood tray manufacturing apparatus, and FIG. FIGS. 4A and 4B are a front view and a side view, respectively, showing a core feeding machine of the wood tray manufacturing apparatus; FIG. 4 is a front view showing a gluing machine of the wood tray manufacturing apparatus;
(A) and (B) are a front view and a side view, respectively, showing a drying furnace of the woody tray manufacturing apparatus, and FIGS. 6 (A), (B) are front views showing a hot stamper of the woody tray manufacturing apparatus, respectively. , A side view, and FIGS. 7A and 7B are a front view, a side view, and a sectional view, respectively, showing a split conveyor of the same wood tray manufacturing apparatus.
FIGS. 8A and 8B are a plan view and a front view, respectively, showing a tray forming press of the woody tray manufacturing apparatus, and FIG. 9 is a front view showing a shaping machine of the woody tray manufacturing apparatus, respectively, and FIG. A) and (B) are front views showing an operation before and after a hot stamper of a wooden tray manufacturing apparatus according to a second embodiment of the present invention, and FIG. 11 is a view showing a third embodiment of the present invention. FIG. 12 is a side sectional view showing a forming die of a wooden tray manufacturing apparatus, and FIG. 12 is a side sectional view of a main part of a punching press provided in a shaping machine of a wooden tray manufacturing apparatus according to a fourth embodiment of the present invention.

As shown in FIG. 1, a wooden tray manufacturing apparatus 10 according to a first embodiment of the present invention
Material log 11 consisting of thinned timber of 2cm or more is 9 ~ 15c
and a band sawing machine 13 for forming a square material 12 by sawing into a square m. A four-sided plane machine 14 is provided near the band sawing machine 13 to planarize the upper, lower, left and right surfaces of the square member 12 formed by the band sawing machine 13 to smooth the surface of the square member 12. In the vicinity of the four-plane machine 14, a two-way hydraulic press 16 having a plurality of regular square timbers 12 stacked vertically and horizontally to form a laminated timber 15 and having a vertical and horizontal pressure of about 150 tons is provided. ing.

In the vicinity of the two-way hydraulic press 16, there is provided a boiling tank 17 for boiling the laminated wood 15 formed by the two-way hydraulic press 16, and in the vicinity of the boiling tank 17, the finished laminated wood 15 is completed. Is sliced to form, for example, a veneer plate 18 having a thickness of 0.3 mm and a core plate 19 having a thickness of 0.5 mm. Slicing device 2
0, the sliced veneer 18 and the core plate 19
The apparatus is provided with a high-frequency vacuum depressurizing and drying apparatus 21 which performs heat retention and moisture retention by high frequency under a reduced pressure state and dries so that the water content becomes uniform, for example, about 10 to 15%. In the vicinity of the high-frequency vacuum depressurizing and drying device 21, the veneer plate 18 is cut into dimensions larger than the shape of the product by, for example, about 1 to 5 mm, for example, to a width of 200 mm and a length of 300 mm. 300mm, length 2000mm
And a cutting device 22 for cutting into a long material.

As shown in FIGS. 2, 3A and 3B,
In the vicinity of the cutting device 22, there is provided a core plate loading machine 23 for supplying a core plate 19 formed of a long material having a thickness of, for example, 0.5 mm, a width of 300 mm, and a length of 2000 mm. The core plate loading machine 23 stores the core plates 19 in a stacked state, raises the stack of the core plates 19 each time the core plates 19 are taken out one by one, and keeps the upper end at a constant level. The stocker 24 to be maintained, the suction transfer device 26 that sucks and removes the core plate 19 from the stocker 24 by the suction plate 25, and the core plate 19 transferred by the suction transfer device 26 to the gluing machine 27 which is the next step. And a roller conveyor 28 for conveying.

As shown in FIGS. 2 and 4, a gluing machine 27 is provided adjacent to the roller conveyor 28.
And two coating rollers 29 rotating above and below the core plate 19 conveyed by the roller conveyor 28, and an adhesive provided above the coating roller 29 and supplying the adhesive to the coating roller 29 from the supply port 30. The apparatus includes an agent supply tank 31 and a recovery tank 32 provided below the coating roller 29 to collect excess adhesive falling from the coating roller 29. As the adhesive, a water-soluble thermoplastic adhesive, for example, a polyvinyl acetate-based adhesive, has a relatively low curing temperature of, for example, 80 to 90 ° C., a relatively short curing time of 15 to 20 seconds, and a low workability. Good and preferred.

As shown in FIGS. 2, 5A and 5B,
A drying furnace 33 is provided at a position adjacent to the gluing machine 27, and the core plate 19 sent from the gluing machine 27 is provided in the drying furnace 33.
Is provided, and a plurality (for example, 30 to 50) of carrier rollers 35 are arranged in the longitudinal direction. The carrier roller 35 is attached to a plurality of rotating shafts 37 at intervals with a plurality of thin disks or a ball-shaped disks 36 of an abacus, and each rotating shaft 37 is rotated by a belt or the like, and is bonded by a gluing machine 27. The medium core plate 19 that has been applied and sent out is brought into line contact and transported. The roller conveyor 34 is provided with a tunnel-shaped furnace body 38 so as to surround the carrier roller 35, and is provided with a heating device 41 for sending hot air from an air supply port 39 near an inlet of the furnace body 38 on the side of the gluing machine 27. Hot air is exhausted from an exhaust port 40 near the outlet of the furnace body 38. At the outlet side of the furnace body 38, a cooling conveyor 4 comprising an open roller conveyor
2 are provided.

As shown in FIGS. 2, 6A and 6B,
A hot stamper 43 is provided at a position adjacent to the cooling conveyor 42. The hot stamper 43 is provided with a roller conveyor 44 for receiving the core 19 dried in the drying furnace 33 and a stocker 45 spaced apart from the roller conveyor 44 in the horizontal direction. Stocker 45
Is a front plate 46 that is stacked facing the front and back surfaces of the core plate 19.
The protruding plates 18 formed by the cutting device 22 and having a thickness of, for example, 0.3 mm, a width of 200 mm, and a length of 300 mm are stacked. The stocker 45 raises the stack of the protruding plates 18 every time the protruding plates 18 are taken out one by one so that the upper end thereof is maintained at a constant level.
4 and a plurality of protruding plates 18 on the core plate 19 along the longitudinal direction.
Are provided at the same interval as the pitch at which

When the veneer or wood veneer is used for the core plate 19 for the stocker 45, the grain of the veneer 18 is
Nine grains are arranged at right angles and stacked. In addition,
The grain of the veneer 18 is oriented in the longitudinal direction of the wooden tray 48 (see FIG. 9). Roller conveyor 44 and stocker 4
5, a temporary heater 49 made of, for example, a silicon rubber heater in a table shape for heating to about 100.degree. A stamper 51 having a stamp 50 with a built-in band heater, for example, for heating to about 90 ° C., for example, capable of pressing a central portion of the front plate 46 to be arranged is provided.
A roller conveyor 44 is provided above the roller conveyor 44.
A core plate transporter 53 is provided for sucking the upper core plate 19 by the suction disk 52 and transporting the core plate 19 from the roller conveyor 44 onto the tacking heater 49. In addition, a veneer transfer device 55 is provided above the stocker 45 for sucking the protruding plates 18 stacked on the stocker 45 by a plurality of suction disks 54 and adsorbing and conveying the veneer 18 from the stocker 45 onto a temporary heater 49.

The hot stamper 43 is formed by temporarily attaching the protruding plates 18 to the front and back surfaces of the core plate 19 and temporarily forming the temporary laminated plate 56.
Is controlled by a control device 57 including, for example, a programmable controller. That is, the veneer plates 18 serving as the back plates 47 are placed one by one from the respective stockers 45 on the tacking heater 49 by the veneer transporter 55, and then the core plate 19 sent from the drying furnace 33 is transported to the core plate. The veneer 18 is placed on the veneer 18 on the tacking heater 49 by the machine 53, and the veneer 18 serving as the front plate 46 is placed one by one from each stocker 45 by the veneer conveyor 55 on the core plate on the tacking heater 49. The stamp 50 is pressed from above on each of the projecting plates 18, and the temporary long laminated plate 56 is pressed.
Is formed. An unloading conveyor 58 is provided below the roller conveyor 44, and the temporary long laminated plate 56 formed by the stamper 51 is gripped by an unloader 59 equipped with a gripping device, and transferred to the unloading conveyor 58 from above the temporary attachment heater 49. The temporary long laminated board 56 is carried out from the hot stamper 43 by the carrying-out conveyor 58. The temporary long laminated board 56 carried out to the rear end of the carry-out conveyer 58 is conveyed to the division carrier 61 by the suction carrier 60.

As shown in FIGS. 2, 7A and 7B,
At a position adjacent to the hot stamper 43, there is provided a split transporting machine 61 for transporting a temporary laminated plate 62 cut and separated from the temporary long laminated plate 56 to a tray forming press 63. The split transfer device 61 includes the suction transfer device 60 of the hot stamper 43.
A table 64 on which the temporary long laminate 56 sent out from the table is placed, and a temporary long laminate 56 placed on the table 64
, And two suction transfer devices 66 for transferring along the rails 65 in opposite directions are arranged on both sides of the table 64 so that the temporary long laminated plate 56 is alternately taken out.

Each of the suction transfer devices 66 includes a plurality of suction plates 67 which hold the surfaces of the plurality of front plates 46 which are arranged and temporarily attached in the longitudinal direction of the core plate 19 and respectively hold them. While holding the laminated board 56, it moves in a direction perpendicular to the longitudinal direction of the temporary long laminated board 56. In addition,
The suction board 67 is provided at the tip of an arm 68 extending in the movement direction from the main body of the suction transfer device 66. Below each suction conveyance device 66, a plurality of rotary blades 69 for cutting the space between adjacent front plates 46 of the temporary long laminated plate 56 in a direction perpendicular to the longitudinal direction of the temporary long laminated plate 56 are provided. Is provided. Then, the temporary long laminated board 56 is divided into
In the middle of gripping and transporting by 1, the slitter 70 cuts between the front plates 46 adjacent to the temporary long laminated plate 56 to form a plurality of divided temporary laminated plates 62.

As shown in FIGS. 2, 8A and 8B,
A tray forming press 63 is provided at a position adjacent to the division transfer device 61 in the moving direction. The tray forming press 63
An upper bolster 72 and a lower bolster 73 each having a built-in heater are provided inside the portal frame 71, and the upper bolster 72 is moved up and down by a hydraulic cylinder 74 provided at an upper portion of the portal frame 71, and the lower bolster 72 and the lower bolster 72 are moved downward. The space between the side bolsters 73 is opened and closed. Between the upper bolster 72 and the lower bolster 73, a plurality of molding dies 76 for forming a dish-shaped wooden tray material 75 (see FIG. 9) by heating and pressing the temporary laminated plate 62 are divided by the split conveyor 61. The gripping temporary laminated plates 62 are arranged at the same interval in the same direction as the arrangement direction.
The lower die 78 is attached to the lower bolster 73.

As shown in FIGS. 2 and 9, at a position adjacent to the tray forming press 63, a shaping machine 79 for trimming the outer shape of the wooden tray material 75 to form the dish-shaped wooden tray 48 is provided. . The shaping machine 79 is a tray forming press 6
3, an adsorption / extraction machine 81 for simultaneously extracting a plurality of wooden tray materials 75 formed from the lower mold 78 by an adsorption disk 80,
A slide bed 82 extending in parallel with the arrangement direction of the forming dies 76 of the tray forming press 63 is provided. On the slide bed 82, a forward feed table 83 that can move in the longitudinal direction of the slide bed 82 is provided. The progressive feed table 83 receives a plurality of wooden trays 75 from the suction and unloader 81 and stores a plurality of flat portions 85 on which the edges 84 of the wooden trays 75 are placed and a plurality of dish portions 86 projecting downward. The recesses 87 are arranged at intervals.

In the middle part of the slide bed 82 in the longitudinal direction, a punching blade 88 for punching the outer periphery of the wooden tray 75 into a predetermined shape and trimming the outer shape of the wooden tray 75.
A punch press 89 having a slide bed 8 is provided.
The progressive feeding table 83 arranged on one side is sequentially moved from the end to below the punching blade 88 of the punching press 89, and the edges 84 of the plurality of wood tray materials 75 placed on the progressive feeding table 83 are sequentially punched out. The wooden tray 48 is punched by 89 to form the outer shape. The progressive feed table 83 is a punching press 8
9, a plurality of wooden trays 48 are simultaneously moved to the other side of the slide bed 82 by a plurality of suction plates 90.
The wooden tray 48 on the progressive feed table 83 is attached to the slide bed 8 by suction.
2 to a conveyor 92 provided adjacent to the second conveyor 2. A conveyer 92 is provided with a tunnel-shaped sterilization booth 93 using ultraviolet light, which sterilizes the wooden tray 48 while moving it, and sends the wooden tray 48 to the next process such as packing.

Here, a method for manufacturing a wooden tray according to one embodiment of the present invention using the wooden tray manufacturing apparatus 10 according to the above embodiment will be described. First, the material log 11 made of thinned wood is removed by the band saw 13 to 9 to 15c.
m is formed to form a square member 12. The upper, lower, left and right surfaces of the square member 12 are planarized by a four-plane machine 14 to smooth the surface of the square member 12. Thereafter, a safe water-reactive adhesive is applied to food or the like on the square member 12, and a plurality of square members 12 are stacked vertically and horizontally to form a laminated assembly.
After pressurizing for 30 to 40 minutes from the vertical and horizontal directions by the directional hydraulic press 16, the press is removed from the bidirectional hydraulic press 16 and cured at room temperature for 5 to 8 hours to form a laminated wood 15. Next, a boiling tank 17 containing hot water having a temperature of 65 to 75 ° C.
The glued lumber 15 is charged into the container, and the mixture is boiled for 12 to 15 hours.
The material of the glued laminated lumber 15 is softened and the internal stress is removed.

Next, the glued laminated wood 15 after the boiling treatment is
Before the temperature is lowered, the slicer 20 slices at, for example, 40 to 50 ° C.
A protruding plate 18 of 0.5 mm and a core plate 19 of 0.5 mm are formed. The sliced veneer plate 18 and the core plate 19 are charged into a high-frequency vacuum decompression / drying device 21 composed of a vacuum vessel to easily lower the boiling point in the depressurized vacuum vessel,
While keeping the inside of the core plate 19 from moving, the high-frequency heating is used to automatically maintain the internal temperature and moisture for, for example, 30 to 40 minutes, thereby maintaining the water content of the veneer plate 18 and the core plate 19 uniform. The veneer 18 that has been subjected to high-frequency vacuum drying is cut by a cutting device 22 so that its length and width are each 1.
The core plate 19 is cut so as to have a size larger by about 0 mm, for example, a width of 200 mm and a length of 300 mm, and the core plate 19 is cut into a long material having a width of 300 mm and a length of 2000 mm.

The core board 19 of a long piece of wood veneer is stored in a state of being stacked on a stocker 24, and one core board 19 is stored.
The sheets are taken out one by one by the suction transfer device 26, and the
Is placed on a roller conveyor 28 to be conveyed to the roller conveyor. The core plate 19 placed on the roller conveyor 28 is inserted between the two rotating coating rollers 29 of the gluing machine 27,
The adhesive supplied from the adhesive supply tank 31 to the coating roller 29 is applied to both surfaces of the core plate 19. By rotating the coating roller 29, the core 19 coated with the adhesive is sent to the drying furnace 33, and is moved through the drying furnace 33 by the roller conveyor 34.
The adhesive applied to the core 19 is dried by heating at 110 ° C. for 15 to 25 seconds. The core plate 19 sent out from the drying furnace 33 by the roller conveyor 34 is received by the cooling conveyor 42 provided on the outlet side of the furnace body 38, and the temperature of the core plate 19 is lowered to room temperature so that the adhesive does not stick. .

Next, the core plate 19 is sent from the cooling conveyor 42 to the hot stamper 43, and the core plate 19 is received by the roller conveyor 44. Further, the veneer plates 18 serving as the back plate 47 are placed one by one from the respective stockers 45 of the hot stamper 43 on the temporary heater 49 by the veneer transporter 55. Next, the core plate 19 on the roller conveyor 44 is transferred to the protruding plate 1 on the tacking heater 49 by the core plate transporter 53.
8 and placed on top of it. In addition, each stocker 45-1
The veneer plate 18 serving as the front plate 46 is placed on the core plate 19 on the tacking heater 49 by the veneer conveyor 55 so as to be opposed to the back plate 47. In this state, stamp 5
0 is pressed from the top of each veneer plate 18 and heated at 90-100 ° C. to soften the adhesive, and the core plate 19, the front plate 46, and the back plate 4
7 is temporarily attached to form a temporary long laminated plate 56. afterwards,
The stamp 50 is raised, the temporary long laminated plate 56 is gripped by the take-out device 59, transferred to the unloading conveyor 58 from above the tacking heater 49, and is temporarily transferred by the unloading conveyor 58 and the suction transfer device 60. Is transported to the split transport device 61.

Temporary long laminated board 5 conveyed to split conveyor 61
6 are placed on a table 64, and the temporary long laminates 56 are alternately gripped by the two suction conveyance devices 66, and are respectively perpendicular to the longitudinal direction of the temporary long laminate 56, and in directions opposite to each other. Transport. When the temporary long laminated plate 56 is gripped, the front plate 46 on the temporary long laminated plate 56 is
7 to hold by suction. Then, while the temporary long laminated board 56 is being conveyed, the temporary long laminated board 5 is
6 is cut between adjacent front plates 46 to form a plurality of temporary laminated plates 6.
The plurality of temporary laminated plates 62 are transported to the tray forming press 63 by the suction transport device 66 while being divided. Therefore, the temporary laminated plate 62 is inserted between the upper bolster 72 and the lower bolster 73, and the temporary laminated plate 6
Then, the suction conveyance device 66 is returned to the original position of the table 64. Here, the upper bolster 72 and the lower bolster 73
And press the upper mold 77 against the lower mold 78,
The temporary laminated plate 62 is heated and pressed at ９５95 ° C. for 15 to 25 seconds to form a dish-shaped wooden tray material 75.

Thereafter, the space between the upper bolster 72 and the lower bolster 73 is opened, and the wooden tray material 75 is adsorbed and taken out by the adsorber 81.
And take it out from the lower mold 77,
The dish portion 86 of the wooden tray material 75 is attached to the recess 87 provided in the third tray 3. Then, the progressive feed table 83 is moved to the punching press 89 side, and the concave portion 8 at the end of the progressive feed table 83 is moved.
7 sequentially from the wood tray material 75 mounted on the tray 7 by the punching press 89 provided on the shaping machine 79.
The outer shapes of all the wooden tray materials 75 mounted thereon are trimmed to form a plurality of wooden trays 48 whose outer shapes are adjusted. The progressive table 83 on which the wooden tray 48 is placed,
After passing through the punching press 89, it is moved to the other side of the slide bed 82, and the wooden tray 48 on the progressive table 83 is moved.
Is moved to the conveyor 92 by the suction / extractor 91. Then, the wooden tray 48 on the conveyor 92 is disinfected to the sterilizing booth 9.
3 and sterilized and sent to the packing process as a food tray.

As described above, the glued lumber 15 assembled from the thinned log material 11 is boiled, sliced, and dried by high-frequency decompression, and then a veneer 18 and a core plate 19 are formed. After the adhesive is applied to the plate 19, the adhesive is dried by the drying furnace 33, thereby removing excess moisture of the adhesive.
After forming the dish-shaped wooden tray material 75 by the tray forming press 63 through the step of temporarily attaching the
In addition, no air bubbles are generated between the back plate 47 and the core plate 19, and peeling or cracking does not occur in the wood tray 48 as a product. At this time, the wooden tray 4
The product moisture content of No. 8 is maintained at about 8%, and no cracking occurs.

As shown in FIGS. 10A and 10B, an apparatus 10 for manufacturing a wooden tray according to a second embodiment of the present invention.
0 is a wooden tray manufacturing apparatus 1 according to the first embodiment.
0, the veneer conveyor 55 of the hot stamper 43 provided at
A stacking prevention device 101 is provided to prevent a plurality of protruding plates 18 from being taken out at one time. Components having the same functions as those of the components of the wooden tray manufacturing apparatus 10 according to the first embodiment will be described with the same reference numerals. That is, the stacking prevention device 101 includes a suction cup holding member 102 above the stocker 45, and the suction cup holding member 102 has four suction discs 103, 104, 105,
106 are attached at intervals so as to be able to suck the protruding plate 18 so as to be slidable in the vertical direction.
Adjacent two of 3, 104, 105, and 106, for example, suction disks 103 and 104 are the other two suction disks 105,
So that it can move about 5 to 10 mm toward 106,
It is slidably inserted into a long hole 107 provided in the suction cup holding member 102, and is driven by a pusher 108 such as an air cylinder. Sucker holding member 102
Is made movable by an elevating device 109 composed of an air cylinder or the like that can move up and down, and the elevating device 109 is reciprocally movable between a position above the stocker 45 and the temporary heater 49 by a linear moving device 110. Guide members 111 are provided on both sides of the upper end of the stocker 45 in the direction in which the pusher 108 moves, so that both sides of the protruding plate 18 can be hooked. In addition, the suction cup holding member 102 and the suction cup 103,
A return spring 11 is provided between the distal ends of 104, 105 and 106.
2 are provided so that the suction cup 103 is always pushed out below the suction cup holding member 102.

Here, the operation of sucking the veneer 18 from the stocker 45 by the veneer transporter 55 having the stacking prevention device 101 will be described. As shown in FIG. 10A, the suction holding member 102 is lowered by the lifting device 109, and the suction plates 103 to 106 are pressed against the protrusions 18 stacked on the stocker 45 to suck the protrusion 18. Next, as shown in FIG. 10B, when the two suction disks 103 and 104 are moved toward the other two suction disks 105 and 106 by the pusher 108, the suction disks 1
03, 104 and the suction plates 105, 106 are shortened, the sucked veneer 18 is curved, and the suction plates 10
The end of the protruding plate 18 on the side of 5, 106 is hooked on the guide member 111, so that the two or three protruding plates 18 are separated from each other and the overlap is removed, and only one protruding plate 18 is suctioned.
In this state, the two suction disks 1 are
03 and 104 are returned to their original positions, and the suction devices 103 to 106 are lifted together with the suction cup holding members 102 by the lifting / lowering device 109, so that only one protruding plate 18 that is in close contact with each of the suction plates 103 to 106 is suctioned. Can be taken out. If the overlap of the protruding plates 18 still remains, the lifting device 109 is raised, for example, by about 5 to 20 mm, and then the suction holding device 102 is slightly lowered by the lifting device 109 in a shocking manner. Panel 103
Alternatively, the overlap may be separated by applying an impact to 突 106 and the sucked protruding plate 18. Also, pusher 108
Also, by moving the two suction plates 103 and 104 back and forth a plurality of times, the overlap of the protruding plates 18 is separated, and the stacking can be prevented. This makes it possible to form the temporary long laminated plate 56 by securely attaching the projecting plates 18 one by one to the front and back surfaces of the core plate 19 by the hot stamper 43, and to form a plurality of the projecting plates 18 on one side of the core plate 19. It is possible to prevent the formation of defective products that are stacked.

As shown in FIG. 11, a wooden tray manufacturing apparatus 120 according to a third embodiment of the present invention comprises a molding die 76 attached to an upper bolster 72 and a lower bolster 73 of a tray forming press 63, respectively. An upper mold 77 and a lower mold 78 are held so as to be able to float in front, rear, left and right, respectively.
That is, the upper die 77 and the lower die 78 of each molding die 76 are provided with stepped parts 121 and 122 around the holding die 123 and 12.
4 is applied to the stepped portions 121 and 122, and the holding fittings 123 and 124 are held by the upper bolster 72 and the lower bolster 73 by bolts 125, respectively. Upper mold 77,
A gap of, for example, about 5 mm is provided between the side surface of the lower mold 78 and the holding fittings 123 and 124, and each bolt 125
The upper mold 77 and the lower mold 78 heat and press the temporary laminated plate 62, and when the lateral thrust acts on the upper mold 77 and the lower mold 78, the upper mold 77 and the lower mold 78 float back and forth and left and right. Tighten to the extent possible. Thereby, the upper mold 77 and the lower mold 7
8 is adapted to a temporary laminated plate 62 in which a core plate 19 and a veneer 18 adhered to the front and back thereof are laminated, and the core plate 19 and the veneer 1
No pressure is locally applied due to the thickness variation of 8, and it is possible to prevent the woody tray 48 as a product from being cracked.

As shown in FIG. 12, the wood tray manufacturing apparatus 130 according to the fourth embodiment of the present invention is different from the punching press 89 provided in the wood tray manufacturing apparatus 10 according to the first embodiment. A holding plate 132 is provided at the tip of a ram 131 that can be raised and lowered, and a plurality of sliding holes 133 are provided around the holding plate 132 at intervals. Sliding hole 1
A head bolt 134 is slidably fitted to 33, and the head bolt 134 is fixed to a cutting blade holder 135 that holds a punching blade 88 disposed below the holding plate 132, and the holding plate 132 and the cutting blade holder are fixed. 135 is maintained at a predetermined interval. Then, a spring 136 is inserted between the holding plate 132 and the cutting blade holder 135 to constantly urge the punching blade 88 to be pressed downward, and the punching blade 88 is flexibly supported by the ram 131. The progressive feed table 83 is provided with a receiving base 137 having an outer periphery meshing with the punching blade 88 and provided with a concave part 87 at the center, and the receiving base 137 is provided with a plurality of suction plates 138 opening to the concave part 87. The wooden tray material 75 attached to the first tray is held. A stripper 139 made of an elastic material such as hard rubber is provided on the outer periphery of the receiving base 137.

Here, the operation of punching the outer periphery of the wooden tray material 75 of the wooden tray manufacturing apparatus 130 according to the fourth embodiment into a predetermined shape will be described. The wooden tray 75 is mounted on the concave portion 87 of the receiving table 137 and held by the suction cup 138, then the ram 131 is lowered, and the outer periphery of the wooden tray 75 is punched by the punching blade 88. At this time, the spring 13
6 deflects, the punching blade 88 punches the outer shape of the wood tray material 75 with a predetermined shearing force, and forms the wood tray 48 inside the punching blade 88. Thereafter, the ram 131 is raised, but the wooden tray 48 remains in the concave portion 87 because it is held by the suction cup 138. Chips on the outer peripheral side obtained by removing the wood tray 48 from the wood tray material 75 are lifted by the stripper 139 and separated from the wood tray 48. Accordingly, even if there is an error in the height of the progressive table 83 or the thickness of the wooden tray material 75, the spring 13
6, the stroke of the punching press 89 is automatically adjusted, and the punching blade 88 can reliably punch and trim the outer shape of the wooden tray material 75 with a predetermined shearing force, thereby significantly improving the yield rate. it can. Also,
For example, by setting the punching speed to 1 second or less per piece, it is possible to cope with mass production.

Although the present invention has been described with reference to the embodiment, the present invention is not limited to the structure described in the above-described embodiment, but is limited to the matters described in the claims. Other embodiments and modifications that can be considered within the scope are also included. For example, in the method of manufacturing a wooden tray according to the above-described embodiment, an example in which a long wooden material or a long veneer is used for the core 19 is described. However, a wood fiber board or a particle board is used for the core 19. Alternatively, a synthetic resin film or thick paper may be used. Further, the lower mold 78 of the molding die 76 is formed so that the center of the bottom of the recess is slightly higher than the periphery of the bottom, for example, about 1 to 2 mm, that is, at a so-called middle height, and the center of the projection of the upper mold 77 is recessed, for example, about 1 to 2 mm. Every other, the top plate 46, the middle core plate 19
By stacking the back plate 47 and the lower die 77 and the upper die 78 and pressing them by heating, a wooden tray having a bottom plate formed at an intermediate height may be manufactured. Thereby, a wooden tray having high rigidity can be formed.

Further, in the wooden tray manufacturing apparatus 10 according to the above-described embodiment, the suction transfer device 66 of the split transfer device 61,
Although the example in which the tray forming press 63, the shaping machine 79, and the sterilizing booth 93 are provided on both sides of the table 64 has been described, the components from the suction transfer device 66 of the divided transfer device 61 to the sterilization booth 93 are provided only on one side of the table 64. You may.
Further, in the method for manufacturing a wooden tray according to the above-described embodiment, an example in which a long material is used for the core plate 19 has been described, but the wooden single plate having the same dimensions as the front plate 46 and the back plate 47 is used for the core plate. Alternatively, a veneer material can be used. In this case, after the adhesive is applied to the core plate and dried, the core plate from the cooling conveyor 42 is arranged at intervals on the temporary heater 49 of the hot stamper 43 and temporarily attached to the projecting plate 18. Often, the slitter 70 becomes unnecessary.

[0037]

According to the present invention, in the method for manufacturing a wooden tray, an adhesive is applied to both surfaces of the core plate, and the adhesive applied to the core plate is dried. Temporary laminates are formed by temporarily attaching the veneer to the back side to form a temporary laminate, and the temporary laminate is heated and pressed with a wooden tray forming mold, so that no air bubbles are generated between the core plate and the veneer In addition, it is possible to provide a high-quality wooden tray without causing peeling or cracking in the product wooden tray.

In particular, in the method for manufacturing a wooden tray according to the second aspect, the core plate is made of a thin wooden plate, the grain of which is orthogonal to the front and back veneers, and the grain of the front and back veneers is that of the wooden tray. Since it is oriented in the longitudinal direction, cracks are less likely to be formed along the grain, and the quality of the wooden tray can be stabilized. Further, in the method for manufacturing a wooden tray according to claim 3, the core plate is made of a long material in which a plurality of veneers can be arranged, and the veneer plates are temporarily attached to the core plate at intervals to form a temporary long lamination. After the board is formed, the temporary laminated board is cut by cutting it between adjacent veneers to form a temporary laminated board, so the adhesive is applied automatically by a gluing machine such as a roll coater. it can. In addition, efficient transfer to a tray forming press can be performed in a state where a plurality of temporary laminates are connected. In the method for manufacturing a wooden tray according to the fourth aspect, since the bottom of the dish-shaped wooden tray is formed at an intermediate height by heating and pressing the temporary laminate with a molding die of the wooden tray, the wooden material having high rigidity is obtained. Trays can be formed.

According to a fifth aspect of the present invention, there is provided an apparatus for manufacturing a wooden tray, wherein a core plate loading machine, a gluing machine for applying an adhesive to the front and back surfaces of the core plate, and an adhesive while conveying the core plate. A drying oven for drying the veneer, a hot stamper for temporarily attaching the wood of the veneer to be perpendicular to the grain of the core board to form a temporary long laminate, and a temporary long in the middle of transporting the temporary long laminate. A split transfer machine that cuts the laminate and divides it into a plurality of temporary laminates, a tray forming press that has a forming die that heats and presses the temporary laminate to form a wood tray, It has a trimming machine for trimming. In this way, from the step of applying the adhesive to the core plate of the long material, the front plate and the back plate made of the veneer are temporarily attached to the core plate, and the tray-shaped wood tray material is formed by the tray forming press. In addition, it is possible to provide a manufacturing facility capable of automatically mass-producing a process from trimming the outer shape to a product as a wooden tray.

In particular, in the apparatus for manufacturing a wooden tray according to the sixth aspect, the hot stamper includes a veneer transporter that sucks and transports the veneer from a stocker in which the veneer is stacked onto a temporary heater, and the veneer transporter is configured to transport the veneer. Since a stacking prevention device is provided to prevent multiple sheets from being taken out at once, it is possible to form a temporary long laminated board by securely attaching the veneers one by one to the front and back of the core plate with a hot stamper. In addition, it is possible to prevent formation of a defective product in which a plurality of projecting plates are stacked on one side of the core plate. In the apparatus for manufacturing a wooden tray according to claim 7, the tray forming press holds the upper mold and the lower mold of the mold so as to be able to float back and forth and left and right, respectively, so that they are bonded to the core plate and its front and back surfaces. It is familiar with the temporary laminate in which the veneer is laminated, does not locally apply pressure due to variation in the thickness of the veneer, can prevent cracks from occurring in the wood tray as a product, and manufactures stable quality wood trays It is possible. In the apparatus for manufacturing a wooden tray according to claim 8, since the shaping machine includes the punching press and the punching blade that is flexibly supported by the punching press via a spring, the height of the progressive table and the wood tray material are provided. Even if there is an error in the thickness of the spring, the spring bends and the stroke of the punching press is automatically adjusted,
The punching blade can reliably punch the wood tray material, improve the quality of the wood tray, stabilize the manufacturing process, and enable mass production.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first half of a wooden tray manufacturing apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view showing a latter half of the wood tray manufacturing apparatus.

FIGS. 3A and 3B are a front view and a side view, respectively, showing a core feeding machine of the same wooden tray manufacturing apparatus.

FIG. 4 is a front view showing a gluing machine of the wood tray manufacturing apparatus.

FIGS. 5A and 5B are a front view and a side view, respectively, showing a drying furnace of the wood tray manufacturing apparatus.

FIGS. 6A and 6B are a front view and a side view, respectively, showing a hot stamper of the wood tray manufacturing apparatus.

FIGS. 7A and 7B are a front view and a side view, respectively, showing a split transporter of the wood tray manufacturing apparatus.

FIGS. 8A and 8B are a plan view and a front view, respectively, showing a tray forming press of the wood tray manufacturing apparatus.

FIG. 9 is a front view showing a shaping machine of the wood tray manufacturing apparatus.

FIGS. 10A and 10B are front views showing operations before and after a hot stamper of an apparatus for manufacturing a wooden tray according to a second embodiment of the present invention.

FIG. 11 is a side sectional view showing a forming die of a wooden tray manufacturing apparatus according to a third embodiment of the present invention.

FIG. 12 is a front sectional view of a main part of a punching press provided in a shaping machine of a wooden tray manufacturing apparatus according to a fourth embodiment of the present invention.

[Explanation of symbols]

10: wood tray manufacturing equipment, 11: material log, 12:
Square wood, 13: band sawing machine, 14: 4-plane milling machine, 15: laminated wood, 16: two-way hydraulic press, 17: boiling tank, 18: veneer, 19: core plate, 20: slicer, 21: high frequency Vacuum reduced pressure drying device, 22: cutting device, 23: core plate feeding machine, 24: stocker, 25: suction plate, 26: suction transfer machine, 27: gluing machine, 28: roller conveyor, 29:
Coating roller, 30: supply port, 31: adhesive supply tank, 32: collection tank, 33: drying furnace, 34: roller conveyor, 35: carrier roller, 36: disk,
37: rotating shaft, 38: furnace body, 39: air supply port, 40: exhaust port, 41: heating device, 42: cooling conveyor, 4
3: Hot stamper, 44: Roller conveyor, 4
5: Stocker, 45: Stocker, 46: Front plate, 4
7: Back plate, 48: Wooden tray, 49: Temporary heater, 5
0: stamp, 51: stamper, 52: suction disk, 5
3: core plate transporter, 54: suction plate, 55: veneer transporter,
56: temporary laminated board, 57: control device, 58: carry-out conveyor, 59: take-out machine, 60: adsorption carrier, 61: split carrier, 62: temporary laminate, 63: tray forming press,
64: table, 65: rail, 66: suction transfer machine, 6
7: suction disk, 68: arm, 69: rotary blade, 70: slitter, 71: portal frame, 72: upper bolster, 7
3: Lower bolster, 74: Hydraulic cylinder, 75: Wood tray material, 76: Mold, 77: Upper mold, 78: Lower mold, 7
9: shaping machine, 80: suction machine, 81: suction removal machine, 82:
Slide bed, 83: progressive table, 84: edge,
85: flat portion, 86: dish portion, 87: concave portion, 88: punching blade, 89: punching press, 90: suction disk, 91: suction extraction machine, 92: conveyor, 93: sterilization booth, 10
0: wood tray manufacturing device, 101: stacking prevention device, 102: suction cup holding member, 103 to 106: suction disc,
107: long hole, 108: pusher, 109: lifting device, 110: linear moving device, 111: guide member, 11
2. Return spring, 120: wooden tray manufacturing device, 12
1, 122: stepped portion, 123, 124: holding bracket, 1
25: bolt, 130: wood tray manufacturing device, 13
1: ram, 132: holding plate, 133: sliding hole, 1
34: bolt with head, 135: cutting blade holder, 13
6: Spring, 137: Cradle, 138: Suction disk, 1
39: Stripper

Claims (8)

[Claims] 1. A method for manufacturing a wooden tray in which veneers are laminated on the front and back surfaces of a core plate and formed into a dish shape, wherein an adhesive is applied to the front and back surfaces of the core plate, and After drying the applied adhesive, a temporary laminate is formed by temporarily attaching the protruding plates to the front and back surfaces of the core plate so as to face each other, and heat-pressing the temporary laminate with a wooden tray forming die. A method of manufacturing a wooden tray. 2. The method for manufacturing a wooden tray according to claim 1, wherein said core plate is made of a thin wooden plate, and its grain is orthogonal to said front and back veneers, and said front and back veneers have said grain. A method for producing a wooden tray, characterized by being oriented in the longitudinal direction of the wooden tray. 3. The method for manufacturing a wooden tray according to claim 1, wherein said core plate is made of a long material in which a plurality of said veneers can be arranged, and said veneers are spaced from each other by said core plate. A method for manufacturing a wooden tray, comprising: forming a temporary laminated sheet by temporarily attaching the sheet, and cutting the space between the protruding plates adjacent to the temporary laminated sheet to form the temporary laminated sheet. 4. The dish-shaped wooden tray according to claim 1, wherein the temporary laminate is heated and pressed with a mold for the wooden tray. A method for producing a wooden tray, wherein the bottom of the tray is formed at a middle height. 5. An apparatus for manufacturing a wooden tray in which veneers are laminated on the front and back surfaces of a core plate and formed into a dish shape, wherein the core plates stacked in a long material state are placed on a conveyor. And a gluing machine for applying an adhesive to the front and back surfaces of the core plate transported by the core plate loading device, and drying the adhesive while transporting the core plate. Drying oven, and the grain of the veneer plate is opposed to the front and back surfaces of the core plate dried in the drying furnace, so that the grain of the veneer plate is orthogonal to the grain of the core plate, and furthermore, the interval between the neighboring veneer plates is set. A hot stamper, which is opened and temporarily attached to form a temporary long laminated board, and cuts between adjacent protruding boards of the temporary long laminated board while adsorbing and transporting each of the protruding boards temporarily attached to the core plate. Transporting machine to divide the temporary laminate into a plurality of temporary laminates, An apparatus for manufacturing a wood tray, comprising: a tray forming press provided with a forming die for forming a wood tray material; and a shaping machine for trimming an outer shape of the wood tray material. 6. The wood tray manufacturing apparatus according to claim 5, wherein the hot stamper includes a veneer transporter that sucks and transports the veneer from a stocker on which the veneer is stacked onto a temporary mounting heater. An apparatus for manufacturing a wooden tray, comprising a stacking prevention device for preventing a plurality of veneers from being taken out at once. 7. The wooden tray manufacturing apparatus according to claim 5, wherein the tray forming press holds the upper mold and the lower mold of the molding die so as to be able to float back, forth, right and left, respectively. Wooden tray manufacturing equipment. 8. The apparatus for manufacturing a wooden tray according to claim 5, wherein the shaping machine includes a punching press, and a punching blade flexibly supported by the punching press via a spring. An apparatus for manufacturing a wooden tray, comprising: