JPH09142474A - Beam member and pallet using said beam member, and manufacture of beam member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the productivity of a beam member by a method wherein a double face corrugated fiberboard on the front and rear sides of the corrugated layer of which, first and second liners are fixed, is made a raw material to manufacture the beam member, and for such a beam member, a plurality of small corrugated fiberboard pieces are folded into a bellows state, superposed and bonded at incised parts. SOLUTION: A constituent raw material for a beam member consists of a double face corrugated fiberboard on the front and rear surfaces of a corrugated sheet 10a of which, first and second liners 10b, 10c are fixed with an adhesive such as a glue. For the double face corrugated fiberboard, in an incision process, the first liner 10b and the corrugated sheet 10a, the second liner 10c and the corrugated sheet 10a, are alternately cut at each incision line 11 along the incision line 11, and by doing so, a plurality of small corrugated fiberboard pieces 22 which are connected by the first and second liners 10b, 10c, are formed for each incision line 11. Then, the adjacent small corrugated fiberboard pieces 22 are folded so as to be superposed with each other, and the folded corrugated fiberboard is compressed from the side surface by a compressing device, and carried while being bonded with a glue, and a specified beam member 34 is completed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a girder using double-faced corrugated board as a constituent material, a pallet using the girder, and a method for manufacturing the girder.

[0002]

2. Description of the Related Art Conventionally, corrugated cardboard is lightweight but has high strength and absorbs impact force. It is used as a constituent material for upper plates and girders (see Japanese Utility Model Laid-Open No. 62-14673). In particular, corrugated cardboard, unlike cardboard, has the advantage that it is extremely easy to recycle and has excellent recyclability.

The first conventional method of forming the girder material of the pallet from corrugated board is to prepare a girder material by stacking a predetermined number of large corrugated board sheets and pasting them together and cutting them with a saw to a predetermined size. There is. In this method, material loss occurs when cutting with a saw, resulting in high cost, and in addition, there is a possibility that material scraps may adhere to the girder material or may scatter to reduce workability. The second method is to form a girder material by putting a crease (a polygonal line) on a corrugated board and bending and superposing it. In this method, the bending process becomes difficult and the cost is high.Because the dimensional accuracy is low, the height of the girder material becomes uneven, and the corrugated liner is exposed on the upper and lower end surfaces of the girder material, and the corrugated board is exposed. Because the hole of is not exposed,
There is a problem that the adhesion of the adhesive is not sufficient and the adhesive force between the girder material and the upper plate or the lower plate is lowered. The third method is to cut a corrugated cardboard into the same rectangular shape to create a large number of corrugated cardboard pieces, and stack a predetermined number of corrugated cardboard pieces one by one and bond them. This method requires a complicated and inefficient process of gluing and joining small pieces of corrugated board one by one, resulting in extremely low productivity.

Therefore, an object of the present invention is to provide a girder material having excellent productivity, a pallet which can be easily constructed by using the girder material, and a method for manufacturing the girder material with high productivity. It is a thing.

[0005]

In order to achieve the above-mentioned object, a method of manufacturing a girder material according to claim 1 of the present invention is characterized in that a corrugated plate is formed on a front surface and a back surface of a corrugated layer. A method for manufacturing a girder material from a double-faced corrugated cardboard having a second liner fixed thereto, the method comprising: extending along a direction substantially orthogonal to a ridgeline extending in the longitudinal direction of the corrugated plate and extending in parallel at regular intervals. The first liner and the corrugated layer and the second liner and the corrugated layer are alternately incised along a plurality of incision lines for each incision line, and are connected by the first or second liner of the incision part. A plurality of corrugated cardboard pieces are created, and the corrugated cardboard pieces are folded in a bellows shape at the incision portion to be polymerized and joined.

A method of manufacturing a girder material according to a second aspect of the present invention is the method of manufacturing the girder material according to the first aspect, wherein the cut line is formed on the surface of one liner at both ends along a direction substantially orthogonal to the ridgeline of the double-faced corrugated board. Reinforcing paper materials having a width equal to or wider than the spacing are stacked to form the material, and the reinforcing paper materials are positioned on the outer surfaces of the folded corrugated cardboard pieces at both ends.

A method of manufacturing a girder material according to a third aspect of the present invention is the method of manufacturing the girder material according to the first or second aspect, in which the double-faced corrugated board is incised by using a saw blade having a concave and convex blade edge.

In the girder material according to claim 4 of the present invention, the first and second corrugated layers are formed on the front and back sides of the corrugated layer which is formed by laminating one or a plurality of corrugated plates.
Of the double-sided corrugated cardboard to which the liner of FIG. 1 is fixed, and the first line for each of a plurality of incision lines extending in a direction substantially orthogonal to the ridgeline extending in the longitudinal direction of the corrugated plate and extending in parallel at a constant interval. Liner and corrugated layer, and the second liner and corrugated layer are alternately incised to have a plurality of corrugated cardboard pieces connected by the first or second liner of the incision part, and these corrugated cardboard pieces are cut out. The parts are folded in a bellows shape, polymerized, and joined to each other.

A girder material according to a fifth aspect of the present invention is the fourth aspect.
In, the reinforcing paper material is attached to at least the liners outside the corrugated cardboard pieces at both ends.

The material used for the girder material according to claim 6 of the present invention is a material made of double-faced corrugated board in which first and second liners are fixed to the front and back of a corrugated layer formed by laminating one or more corrugated plates. Therefore, the reinforcing paper material is attached to the surfaces of at least one of both ends of the liner.

In a pallet using the girder material according to claim 7 of the present invention, a plurality of girder materials according to claim 4 or 5 are juxtaposed at a predetermined interval, and a flat plate is provided on at least the upper surface of the upper surface and the lower surface of the girder material. It is joined.

A pallet using a girder material according to an eighth aspect of the present invention is the pallet according to the seventh aspect, wherein the girder material and the flat plate are adhered, and the bonding surface of the flat plate to the girder material is filled with an adhesive. A plurality of reinforcing holes are formed.

[0013]

According to the invention of claim 1 or 4,
A plurality of double-sided corrugated boards that have been cut into a predetermined width equal to the length of the girder material to be created in advance extend in a direction orthogonal to the ridgeline of the corrugated plate extending in the longitudinal direction, that is, along the width direction and in parallel at regular intervals. Set the incision line of. Here, the interval between the incision lines is the height of the girder material to be created. When the double-faced corrugated board is incised along the incision line, the double-faced corrugated board is incised alternately from the front side and the back side of each double-sided corrugated line. The first liner and the corrugated layer are cut from the front side, and the second liner and the corrugated layer are cut from the back side to form a plurality of corrugated cardboard pieces. Therefore, the corrugated cardboard pieces are formed in a state in which the first and second liners remaining on the front side and the back side are alternately connected for each incision. Next, after applying an adhesive to the front and back surfaces of the plurality of corrugated cardboard pieces, the corrugated cardboard pieces are folded in a bellows shape at the cutout portions, and the corrugated cardboard pieces are polymerized and bonded to each other with an adhesive.

Further, in the girder material, a plurality of corrugated cardboard pieces connected by the first and second liners which remain alternately on the front side and the back side for each incision part are the first or second liner remaining in the incision part. Are alternately folded back in the opposite direction to be folded into a bellows-like shape, and are polymerized and joined. Therefore, both end surfaces of the girder are formed by the cutouts of each of the plurality of corrugated cardboard pieces, but the cutouts of two adjacent corrugated cardboard pieces are connected by the remaining first or second liner, The two corrugated cardboard pieces are prevented from peeling and opening when a load is applied.

As described above, the corrugated cardboard pieces are left on the front side and the back side alternately at each incision portion.
Since they are formed in a continuous state by the liners, the first liner remaining in the incision portion is bent and folded back while being displaced in the back side by simply applying a force to the continuous corrugated cardboard pieces in a direction in which they are close to each other. And the second liner is bent and folded back while being displaced in the front side direction. As a result, the corrugated cardboard pieces are automatically folded into a bellows-like shape, polymerized, and joined with an adhesive. In this way, a single girder can have a single number of parts, and multiple corrugated cardboard pieces can be automatically polymerized and bonded by simply applying a force to the corrugated cardboard pieces on both sides in the direction of being close to each other. Therefore, the number of working steps can be significantly reduced, and there is no loss of material in the cutting width, so that cost reduction can be achieved. Further, since no material scraps are produced by cutting, there is no possibility that the scraps adhere to the girder material or scatter to reduce workability.

According to the invention of claim 2, 5 or 6, in addition to the effect of the invention of claim 1 or 4, a girder material in which a reinforcing paper material is adhered to the liner outside the corrugated piece at both ends Can be easily manufactured. In addition, this girder material has excellent durability, and especially when it is used in a pallet, both outer surfaces are protected by reinforcing paper materials, so even if it hits the nail of the forklift, it will be seriously damaged. There is no. Furthermore, since the strength of both outer surfaces is increased by the reinforcing paper material, that is, when the upper and lower plates of the pallet try to shift sideways, a large force is applied to the outermost part of the girder material. Because the strength of the part is increased,
When this girder material is used in a pallet, the pallet is resistant to rolling, and also resistant to compression and bending.

According to the third aspect of the present invention, since the double-faced corrugated board is incised with a saw blade having a concave-convex cutting edge, the incised surface becomes extremely rough. Since each corrugated cardboard piece is folded back and overlaps with the first or second liner remaining in the cutout portion to form a spar material, upper and lower end surfaces of the spar material are
It is formed by each incision in a rough state. When a supported member, for example, a flat plate of a pallet, is bonded to at least one of both end surfaces of this beam, the adhesive is satisfactorily adhered because the bonding surface is rough, and the beam and the supported member are The adhesiveness of is improved.

According to the pallet using the girder material of claim 7, a plurality of girder materials of claim 4 or 5 are juxtaposed at predetermined intervals, and a flat plate is joined to at least the upper surface of these girder materials. At this time, the joint surface of the girder member to the flat plate is formed by the cutout portions of each of the plurality of corrugated cardboard pieces. Since the hole-shaped portion formed by the corrugated plate and the liner is exposed in this cutout portion, since the adhesive has a large holding force, the binding force with the flat plate becomes strong.

According to the pallet using the girder material of claim 8, in addition to the function and effect of the pallet of claim 7,
Since a plurality of reinforcing holes filled with the adhesive are formed on the joining surface of the flat plate to the girder material, the holding force of the adhesive is further increased and the binding force with the flat plate is further strengthened.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. First, constituent materials of a girder material according to an embodiment of the present invention will be described. As shown in FIG. 3 (a), the constituent materials of the beam material are the first and second liners (flat paper materials) 10b on the front and back surfaces of the corrugated plate 10a,
Double-sided corrugated board 10 formed by fixing 10c with an adhesive such as glue
Consists of In this embodiment, as shown in FIG. 11B, when the double-sided corrugated board 10 is formed by bonding the first liner 10b and the corrugated plate 10a to the second liner 10c. At the same time, a protective cardboard 40 is pasted on both end surfaces of the first liner 10b with glue (see FIG. 11 (a)) is used as a constituent material of the girder material. As the thick paper 40, water-repellent or water-resistant paper is used to protect the cardboard 10 inside. In the double-sided corrugated board 10, the corrugated plate 10a is not limited to a single layer, and may be a corrugated layer formed by stacking a plurality of layers (double-sided corrugated board).

As shown in FIG. 11A, the thick paper 40 is
It is supplied from the cardboard roll 51. The cardboard roll 51 has an overall width W ₂ and is located at both ends of the cardboard roll 51 and has a width W ₁ .
A cardboard core tube 80 having the same width (length) W ₁ wrapped around and a pair of cardboard tube cores 80, and a spacer core having a width (length) W ₃ having the same inner and outer diameters as the cardboard tube core 80. In order to integrate the cylinder 81, the cardboard core cylinder 80, and the spacer core cylinder 81, the cylinder 81 has an outer diameter substantially corresponding to the inner diameter thereof, and the width (length) inserted therein is slightly shorter than W _2. And an iron pipe 82.

A support member 52 having a substantially conical shaft at its tip is inserted from both ends of the cardboard roll 51, and is supported rotatably around the central axes of the cardboard core cylinder 80 and the spacer core cylinder 81. . The cardboard core tube 80 and the spacer cardboard tube are both made of paper, but caps (not shown) are attached to both ends of the cardboard tube core tube 80 for reinforcement. Here, the width W ₂ of the cardboard roll 51 is the same as the constant length L (FIG. 1) along the longitudinal direction R of the double-faced cardboard 10 described later, and the width W _{1 of the} cardboard 40 is the double-faced cardboard 10 described later.
A plurality of parallel incision lines 1 arranged in the longitudinal direction R at
It may be equal to or wider than the constant interval S of 1 (FIG. 1), and is slightly wider than 2S in this embodiment.

The thick paper 40 is sent from the thick paper roll 51 to the gluing device F. At the time of this feeding, each of the thick papers 40 is tensioned so as to have the same tension,
Alternatively, the tension may be adjusted by separately supporting the pair of cardboard core cylinders 80 instead of integrating them. As shown in the side view of FIG. 11B, this gluing device F is for applying glue to the back surface of the thick paper 40 while sandwiching and transporting the thick paper 40 by a pair of upper and lower gluing rollers 53, 53. That is, the glue 27 is supplied between the glue holding roller 54 and the glue roller 53 from a glue container (not shown) arranged below the glue roller 53, and the glue is applied to the back surface of the thick paper 40 by the glue roller 53. It

The first liner 10b and the corrugated plate 10a are adhered below the cardboard 40 having the back surface coated with glue,
In addition, the lower surface (corrugated plate 10a surface) of which the adhesive is applied is conveyed, and further below the second liner 10c is conveyed. These three persons are sent to the fixing device G. In this fixing device G, the three members are conveyed while being sandwiched between a pressure contact belt 58 driven by a drive roller 56 and a heat plate 59, and the heat members 59 are pressed against each other by a plurality of pressure contact rollers 57. By solidifying the applied paste by the heat from the three sides, the three members are fixed, and the double-faced corrugated cardboard raw material 10A in which the protective cardboard 40 is bonded to both end surfaces of the first liner 10b is configured. This double-sided corrugated board raw material 10A is cut at intervals H in the direction orthogonal to the carrying direction, and is used as the constituent material of the girder material in this embodiment.

Here, the equipment for sticking the protective cardboard 40 to the double-faced corrugated board raw material 10A, that is, the gluing device F and the fixing device G are used in the usual double-faced corrugated board production, so No modification or extension is required. Further, since the thick paper 40 used has a narrow width W ₁ , it is possible to utilize the so-called end-winding that occurs as waste material at a paper mill. Therefore, the cost does not increase particularly when the thick paper 40 is attached to the double-sided corrugated board raw material 10A. In this embodiment, the double-sided corrugated cardboard raw material 10A is pasted with the protective cardboard 40 and cut into pieces to be the constituent material of the girder material. However, the constituent material of the girder material in the present invention is not necessarily limited to the protective cardboard. 40 need not be pasted together, double-sided corrugated board raw material 10A
It can also be cut and used as it is.

Next, a method of manufacturing a girder material using the constituent materials will be described in the order of manufacturing steps. 1 is a plan view showing an apparatus for manufacturing a girder material, FIG. 2 is a front view thereof, and FIG. 3 (a) is a sectional view taken along line III-III of FIG. The girder manufacturing apparatus shown in FIG. 1 includes a carry-in device A, a cutting device B, a gluing device C, a conveying device D, a folding device P, and a compressing device E. When manufacturing the girder material, a double-faced corrugated board 10 is used as shown in FIG.
As shown in, has a constant length L along the longitudinal direction R,
In addition, it is previously cut into a rectangular shape having a predetermined width corresponding to the length H of the girder material to be manufactured. At this time, double-sided corrugated board 1
The longitudinal direction R of 0 is matched with the ridge line J of the corrugated plate 10a.

The double-faced corrugated board 10 extends in the width direction orthogonal to the longitudinal direction R and has a constant interval S in the longitudinal direction R.
A plurality of parallel incision lines 11 arranged at are set. This constant interval S is set to match the height of the girder material to be manufactured. The double-sided corrugated board 10 has a rear side pushed by a pair of transfer arms 12 of the carry-in device A or a hand of an operator, or placed on a belt conveyor (not shown), and a carry-in side provided on a frame fixed to a floor (not shown). While being slid on the base plate 13 and regulated in the moving direction by the loading-side guide plates 14 supported on both sides, the transport direction U
It is transferred to the incision device B at a constant speed.

The incision device B has a pair of upper and lower drive shafts 17 supported by a gantry and arranged orthogonally to the transport direction U. The upper and lower drive shafts 17 and 17 are provided for each incision line 11. Cutters 18 which are alternately arranged at the upper and lower sides and are opposed to the incision line 11 and made of a saw blade are coaxially fixed, and further, the incision lines 11 are alternately arranged at the upper and lower positions, respectively.
A receiving plate 19 made of urethane is coaxially fixed.

As shown in FIG. 3 (a), the cutter 18 has a sawtooth-like unevenness on the blade edge, and
It is arranged at a predetermined height position below. That is, as shown in FIG. 2, the upper cutter 18 has the first liner 10b and the corrugated plate 1 except for the second liner 10c.
The cutter 18 at the bottom is placed at a position where the first liner 10b is left and the second liner 10c and the corrugated plate 10a can be cut. The cutter 18 does not move relative to the object to be cut and cuts like a saw, but cuts the cardboard 10
The corrugated board 10 is incised by rotating at a peripheral speed substantially the same as the transfer speed of (the object to be incised) and pushing the cardboard 10. Therefore, unlike the first conventional method, cutting waste does not occur, the material is saved accordingly, and the problem that the waste of material adheres to the girder 34 does not occur.

Incidentally, instead of the cutter 18, as shown in FIG.
As shown in (b), a cutter 21 having a corrugated unevenness on the cutting edge may be used. That is, as the cutters 18 and 21, it is preferable to use saw blades having uneven edges.
According to this, the cutters 18 and 21 are not cut even if they are cut to the first or second liners 10b and 10c that should be left during the incision, but rather, a dotted line-shaped hole that facilitates later folding is formed. However, a cutter having no unevenness may be used. In this case, the cutter is set so as not to cut to the first or second liners 10b and 10c that should be left during the cutting, that is, not cut.

In the cutting process of the double-sided corrugated board 10 described above,
Double-sided corrugated board 1 cut in advance to a certain length L and a certain width H
While 0 is slid on the loading side base plate 13 by the transport arm 12 and transported in the transport direction U at a constant speed,
The cutter 18 is integrally rotated by the drive shaft 17 in the rotation direction W shown in FIG. At the time of this incision, the double-faced corrugated board 10 is supported up and down by the receiving board 19, and the cutter 1
Accurate incision is made to the depth set at the installation position of 8. That is, the double-sided corrugated board 10 has the first line along the incision line 11.
Liner 10b and corrugated plate 10a, and the second liner 1
0c and the corrugated plate 10a are alternately cut for each incision line 11. As a result of this cutting, as clearly shown in FIG. 5, a plurality (six pieces are illustrated) of corrugated cardboard pieces 22 connected by the first and second liners 10b and 10c alternately left on the front side and the back side for each incision line 11 are formed. It is formed.

Next, the small corrugated cardboard pieces 22 connected by the first and second liners 10b and 10c, which are alternately left and right up and down for each incision 30, are guided by the left and right delivery side guide plates 14 and 14 in FIG. And sent to the gluing device C. As shown in the front view of FIG. 4A, this gluing device C includes a pair of upper and lower gluing rollers 23 supported by a gantry.
While sandwiching the corrugated cardboard 10 with 23 and carrying it,
Adhesive is applied to both the front and back surfaces of the corrugated board 10.
That is, as shown in FIG. 4B, the gluing roller 23
Glue container 24 (below the gluing roller 2
3 is supplied from a glue container corresponding to No. 3) between the glue holding roller 28 and the gluing roller 23, and the gluing roller 23 causes the first or second liner 10 to flow.
Glue is applied to the surfaces of b and 10c, and glued simultaneously to a plurality of corrugated cardboard pieces 22 required to form one girder material.

Here, the length and position of the upper glue holding roller 28 in the axial direction are appropriately set so that no glue is applied to the surface of the cardboard 40 adhered to the corrugated cardboard pieces 22 at both ends. Is desirable. This part is finally outside the girder material, and there is no partner to be joined.
As described above, as compared with the conventional third method in which the corrugated cardboard pieces that are completely separated individually are individually glued, the front and back surfaces of each corrugated cardboard piece 22 can be quickly glued.

When the gluing process is completed, the corrugated board 10 is transferred to the carrier device D shown in FIG. As shown in the front view of FIG. 6A, the carrier device D includes a plurality of chains 70U, 7 that alternately correspond to the upper and lower incisions 30 of the corrugated board 10 from below and above, respectively.
0L is provided to support the cardboard 10 by sandwiching it from above and below.
As shown in the side view of FIG. 6C, each of the chains 70U and 70L has a stay 71 extending substantially in the transport direction U.
Sprocket 72a, 72b rotatably provided at the front and rear ends of the
2b is rotationally driven by a motor or the like (not shown) common to the upper and lower chains 70U and 70L. The stay 71 is fixed to the pedestal at the rear end. As a result, the cardboard 10 sandwiched between the chains 70U and 70L from above and below is transported in the transport direction U. The chains 70U and 70L are made of a material such as metal to which glue is unlikely to adhere.

Here, the vertical intervals of the chains 70U and 70L gradually decrease in the carrying direction U,
Finally, they are installed so that they intersect when viewed from the side.
Therefore, the corrugated cardboard 10 immediately after being unloaded from the gluing device C and loaded into the transport device D is flat as shown in the front view of FIG. 6A, but as it proceeds in the transport direction U,
As shown in the front view of (b), the lower chain 70L is pressed and pressed by the upper chain 70U so that the lower chain 70L is lifted from the lower chain 70L by the upper cut 70. Is pressed against.

As a result, the corrugated board 10 is bent at the cutouts 30 on both the upper and lower sides, but the chains 70U, 7
As shown in the plan view of FIG. 1, 0L is installed in a fan shape so that the interval in the lateral direction V also gradually decreases in the transport direction U. As shown in the side view, as it advances in the transport direction U, it is bent more sharply at the incision 30 while being regulated in the vertical direction and the lateral direction V. However, the folding of the cardboard 10 by the carrying device D is preliminary and is not necessary for the present invention, and the cardboard 10 may be simply carried while being flat. In this carrying step, the rear end portion of the corrugated board 10 is sandwiched by the chains 70U and 70L at the position of the sprocket 72a at the front end portion of the stay 71, and is fed out, so that the corrugated board 10 is desired in the next folding device P shown in FIG. The sheet is conveyed to the position of and the processing ends.

The conveyed cardboard 10 is placed on the two pairs of rails 73 of the folding device P. Each rail 73 extends in the lateral direction V, and is fixed to the pedestal at the left and right ends,
The two rails 73 sandwich the feed bar 74 so that 1
In pairs. As shown in the front view of FIG. 7, the feed bar 74 is taller from the floor than the rail 73 and is movable between the two sandwiched rails 73 in the lateral direction V by a drive device (not shown). . The corrugated cardboard 10 placed on the rail 73 is pushed by the feed bar 74, which was originally located at the right end of the rail 73, moving to the left (indicated by a chain double-dashed line in FIG. 7), and a pair of upper and lower blades is pushed. It is sent between cars 75 and 75.

A large number of impellers 75, 75 are arranged evenly on the shafts 76, 76 extending in the transport direction U (FIG. 1), for example, 1
It is equipped with two plate-shaped blades, and the shaft is on the upper and lower sides.
6 and 76, the upper and lower blades are rotationally driven by a driving device (not shown) so as to mesh with each other. As a result, the fed corrugated board 10 is bent further sharply at the incision 30 while being regulated by the upper and lower blades in the vertical direction and the lateral direction V while being advanced to the left, and the corrugated board pieces 22 are folded so as to overlap each other. . As shown in FIG. 1, the impeller is divided in the transport direction U, and a feed belt 77 is provided therebetween.
As shown in FIG. 7, the feed belt 77 is rotationally driven by two pulleys 78, 78 that extend in the transport direction U and are juxtaposed in the lateral direction V. The folded corrugated cardboard 10 is placed on the feeding belt 77 and further transported to the left guide plate 35a, and the folding process is completed. Guide plate 35a
1, extends in the transport direction U, and is fixed to the gantry at the front and rear ends.

The corrugated cardboard 10 folded and transferred to the guide plate 35a is manually advanced along the guide plate 35a in the conveying direction U, and compressed between the guide plate 35a and another guide plate 35b opposite thereto. It is sent to the device E. This feeding may be performed by not using the manual feeding but using the feeding bar 74 described above. Compressor E
Is a system in which a pair of conveyor belt mechanisms 36 in which belts are wound around pulleys are arranged so as to face each other.
6, the corrugated cardboard 10 that has been folded is conveyed while being compressed from the side surface, and is molded so as to maintain the shape of the girder material 34.

In this way, the corrugated cardboard pieces 22 are polymerized and bonded to each other with the glue 27, and the girder material 34 as shown in FIG. 8 is completed. In this way, one girder material 3
4 in the required number of corrugated cardboard pieces 22 for the incision 3
Since the first and second liners 10b and 10c remaining at 0 can be handled as a single part that is continuous, and a plurality of corrugated cardboard pieces 22 can be automatically polymerized, the number of work steps can be significantly reduced. The cost reduction can be achieved.
In addition, the girder material 34 is provided on both side surfaces thereof with a cardboard 40 having water repellency or water resistance.
However, since both end faces in the length direction are not protected, an appropriate chemical liquid may be sprayed or the like to give water repellency or water resistance to the end faces. When the double-faced corrugated board 10 to which the thick paper 40 is not attached is used as the material of the girder material, the girder material exiting the compression device E should be covered with both side surfaces and both ends in the length direction. Then, a similar beam material can be obtained by partially polymerizing a pair of thick papers 40 and adhering them with glue.

FIG. 9 shows a pallet 37 constructed by using the girder material 34 manufactured by the above-described manufacturing method. The pallet 37 has a plurality of, for example, four of the above-mentioned girder members 34 juxtaposed at predetermined intervals, and an upper plate 41 formed of a flat plate obtained by superposing and joining a plurality of double-faced corrugated boards 10 on the upper and lower surfaces of the girder members 34. And the lower plate 42 are joined together, and as shown in the partial cross-sectional side view of FIG.
1 and an adhesive 6 on the joint surface of the lower plate 42 to the girder member 34.
A plurality of reinforcing holes 65 filled with 6 are formed. An article is placed on the upper surface of the upper plate 41.

Here, as shown in FIG. 9, the ridgeline K of the corrugated plates of the plurality of double-faced corrugated boards 10 forming the upper plate 41 and the lower plate 42 is configured to be orthogonal to the longitudinal direction of the girder member 34. ing. This is because the corrugated board 10 is stronger against the bending moment about the axis along the direction orthogonal to the ridgeline K than on the bending moment around the axis along the ridgeline K of the corrugated plate. This is to prevent the upper plate 41 from being bent along the claws of the forklift when an article is placed on the upper surface of the plate 41 and the claws of the forklift are inserted and lifted along the longitudinal direction of the beam member 34. is there.

Further, the joint surfaces of the girder member 34 to the upper plate 41 and the lower plate 42 are formed by the cutout portions 30 of the corrugated cardboard piece 22, respectively, and these cutout portions 30 are shown in FIGS. When any of the cutters 18 and 21 shown in FIG. 4) makes an incision, it is in a rough state because the blade edges of the cutters 18 and 21 have irregularities. for that reason,
Adhesive or other adhesive is favorably adhered to the joint surface of the beam member 34 and firmly adheres to the upper plate 41 and the lower plate 42. Here, the thickness (width) of the corrugated cardboard pieces 22 stacked on the girder material 34 is not so much necessary as the strength of the girder material 34 is reinforced by the thick paper 40 as will be described later, but the strong adhesion is realized. In order to secure a joint surface to be used, it is necessary to have a sufficient size.

Moreover, in the pallet 37 shown in FIG.
4 is a corrugated plate 10a.
Since it is formed in the direction orthogonal to the ridge line J of the above, unlike the case of the second conventional method, the adhesive is surrounded by the corrugated plate 10a and the first or second liners 10b, 10c. 39, and the joint strength is further improved. Further, in this embodiment, as described above, a plurality of reinforcing holes 65 (FIG. 10) filled with the adhesive 66 are formed on the joint surfaces of the upper plate 41 and the lower plate 42 to the girder material 34. The holding force of the adhesive 66 is further increased, and the joint strength between the girder member 34 and the upper plate 41 and the lower plate 42 is further increased. The reinforcing hole 65 preferably has a shape that does not penetrate so that the adhesive 66 can be held inside the upper plate 41 and the lower plate 42, but its cross-sectional area and depth may be appropriately determined depending on the situation. Here, what is filled in the reinforcing hole 65 is not limited to the adhesive 66 itself, and may be an adhesive filler in which a filler such as finely crushed paper pieces, sawdust or small pieces of wood is mixed.

Further, as shown in FIG. 9, in the upper and lower joint surfaces of the girder material 34, the first or second liner 10 in which the ends of two adjacent corrugated cardboard pieces 22 remain in the cutout 30.
Since they are connected by b and 10c, they do not easily peel off and open when a load is applied. The good adhesiveness described above is obtained, and the adjacent corrugated cardboard pieces 22 are prevented from being peeled off by connecting the ends of the corrugated cardboard pieces 22 with the liners 10b and 10c. Even when directly joined to the lower plate 42, a strong joining strength can be obtained,
Moreover, the load can be stably received without being damaged.

Further, in this pallet 37, since the side surface of the girder material 34 is covered with the thick paper 40, even if the nail of the forklift is hit, it is not seriously damaged. Further, since the strength is increased by the thick paper 40 on the both side surfaces of the girder member 34, that is, when the upper plate 41 and the lower plate 42 of the pallet are about to be displaced laterally, the outermost part of the girder member 34 is displaced. However, since the strength of this part is large, the pallet 37 is strong against rolling,
Further, the strength is sufficiently high against compression when an article is placed on the upper plate 41.

Therefore, the necessary strength can be maintained even if the paper of the first and second liners 10b and 10c and the corrugated plate 10a inside the girder member 34 is thin and inexpensive, and the girder member 3 can be maintained.
As a result, the pallet 37 can be made inexpensive while maintaining the required strength. Further, the pallet 37
Since the girder material 34 is set to have substantially the same width as the widths of the upper plate 41 and the lower plate 42, when a relatively heavy load is placed on the upper plate 41, the claws of the forklift truck are in the middle of the pallet 37. Even if it is inserted only up to, since the load is supported by each girder member 34, the upper plate 41 does not break in the middle.

On the other hand, in the case of forming a pallet without the lower plate 42, even if the girder material 34 is used without any reinforcement treatment of the lower end surface, the lower end part of the girder material 34 is adjacent to the corrugated cardboard pieces. Since the end portions of 22 are connected by the first or second liners 10b and 10c, they are not easily peeled off and opened even when a load is applied, so that no trouble occurs.

The pallet 37 is constructed by arranging the girders 34 so that the longitudinal direction of the girders 34 coincides with the direction in which the claws of the forklift are inserted, but the invention is not limited to this, and for example, As shown in FIG. 11, the short girder material 34
A plurality of, for example, four rows may be arranged at predetermined intervals, and a plurality of, for example, four rows may be arranged at predetermined intervals. According to this pallet 67, the pawls of the forklift can be inserted not only in the direction in which the pawls of the forklift are inserted in the pallet 37 but also in the direction orthogonal thereto. In the case of this pallet 67, for the reason described in the configuration of the pallet 37, the ridgelines M and N of the corrugated plates of the plurality of double-faced corrugated boards 10 forming the upper plate 41 and the lower plate 42 are arranged to be alternately orthogonal to each other. It is configured.

The girder material according to the present invention can be used not only as a pallet but also as a construction material replacing styrene in a wall to obtain heat insulation and soundproofing effects. Further, it is also possible to arrange a plurality of girder materials according to the present invention side by side and join veneer plates to both upper and lower surfaces of these girder materials and use them for a table or the like. In the above embodiment, the case where the double-faced corrugated board 10 is incised by the cutters 18 and 21 has been described, but an intermittent hole such as a perforation is formed in the first liner 10b.
Even if the corrugated plate 10a and the second liner 10c and the corrugated plate 10a are formed, only one liner and the corrugated plate are cut by bending at this portion to obtain the same effect as described above. You can

[Brief description of the drawings]

FIG. 1 is a plan view showing a manufacturing apparatus for carrying out a method for manufacturing a girder material according to an embodiment of the present invention.

FIG. 2 is a front view showing an incision device in the manufacturing apparatus.

3A is a sectional view taken along line III-III in FIG. 2, and FIG. 3B is a side view showing a modified example of a saw blade.

FIG. 4 is a front view showing a gluing device of the manufacturing apparatus, (b).
Is a longitudinal sectional view.

5 is a front view showing a corrugated cardboard cut by the cutting device of FIG. 2. FIG.

FIG. 6A is a front view showing an upstream part of the transfer device in the manufacturing apparatus, FIG. 6B is a front view showing a downstream part of the transfer device, and FIG. 6C is a side view showing the transfer device. .

FIG. 7 is a front view showing a folding device in the manufacturing apparatus.

FIG. 8 is a perspective view showing a girder material manufactured by the manufacturing apparatus.

FIG. 9 is a partially cutaway perspective view showing an example of a pallet using the same girder material.

FIG. 10 is a partially cut side view showing an example of a pallet using the same girder material.

FIG. 11 is a partially cutaway perspective view showing another example of the pallet using the same girder material.

FIG. 12 (a) is a plan view showing an apparatus for manufacturing a girder material according to an embodiment of the present invention, and FIG. 12 (b) is a side view showing the apparatus.

[Explanation of symbols]

10 ... Double-sided corrugated board, 10a ... Corrugated board, 10b ... 1st liner, 10c ... 2nd liner, 11 ... Incision line, 18,
21 ... Cutter (saw blade), 22 ... Corrugated cardboard piece, 30 ...
Incision part, 34 ... Girder material, 37, 67 ... Pallet, 40 ... Cardboard (reinforcing paper material), 41 ... Upper plate (flat plate), 42 ... Lower plate, 6
5 ... Reinforcing hole, 66 ... Adhesive, R ... Longitudinal direction, J ... Ridge line of corrugated plate, S ... Constant interval.

Claims (8)

[Claims] 1. A method for producing a girder material from a double-faced corrugated board having first and second liners fixed to the front and back surfaces of a corrugated layer formed by laminating one or more corrugated boards, the method comprising: A plurality of incision lines extending in parallel at a constant interval along a direction substantially orthogonal to the ridgeline extending in the longitudinal direction of the corrugated plate,
The first liner and corrugated layer and the second liner and corrugated layer are incised alternately for each incision line to create a plurality of corrugated cardboard pieces connected by the first or second liner of the incision part. Then, a method of manufacturing a girder material in which a plurality of the corrugated cardboard pieces are folded in a bellows shape at an incision portion, and are polymerized and joined. 2. The reinforcing paper material according to claim 1, having a width equal to or wider than the interval between the cut lines on the surface of one liner at both ends along a direction substantially orthogonal to the ridgeline of the double-faced corrugated board. A method of manufacturing a girder material in which the above-mentioned material is made by stacking the above-mentioned materials and the reinforcing paper material is positioned on the outer surface of the corrugated cardboard pieces at both ends of the folding. 3. The method for manufacturing a girder material according to claim 1, wherein the double-faced corrugated board is incised by using a saw blade having concave and convex blade edges. 4. A girder material comprising double-faced corrugated cardboard having first and second liners fixed to the front and back of a corrugated layer formed by laminating one or more corrugated plates, the ridge line extending in the longitudinal direction of the corrugated plate. The first liner and the corrugated layer and the second liner and the corrugated layer are incised alternately for each of a plurality of incision lines extending in a direction substantially orthogonal to and parallel to each other at a constant interval to form an incision portion. A girder material having a plurality of corrugated cardboard pieces connected by the first or second liner, which are folded in a bellows shape at an incision portion to be polymerized and joined to each other. 5. The girder material according to claim 4, wherein a reinforcing paper material is bonded to at least liner outside the corrugated cardboard pieces at both ends. 6. A material made of double-faced corrugated board in which first and second liners are fixed to the front and back of a corrugated layer formed by laminating one or more corrugated sheets, and at least one liner is reinforced on the surface at both ends. A material made by pasting paper materials together. 7. A pallet in which a plurality of girders according to claim 4 or 5 are juxtaposed at predetermined intervals, and a flat plate is joined to at least the upper surface of the upper and lower surfaces of these girders. 8. The pallet according to claim 7, wherein the girder member and the flat plate are adhered to each other, and a plurality of reinforcing holes filled with the adhesive are formed on a joining surface of the flat plate to the girder member.