JP3833965B2 - Corrugated cardboard coating equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention prevents the generation of paper dust from so-called corrugated cardboard, which is formed by sandwiching corrugated paper between a pair of flat papersStepBall materialCoating equipmentIt is about.
[0002]
[Prior art]
Corrugated cardboard is a composite paper that is formed by combining cardboard, and corrugated paper made of cardboard is sandwiched between a pair of cardboard flat paper, which is excellent in shape retention for light weight. In addition, since it has good buffering properties and is inexpensive, it is useful as a packaging material for various articles.
[0003]
The cardboard used as a raw material for such corrugated cardboard is generally made of so-called recycled paper that has been recycled from used paper in terms of cost reduction and effective utilization of resources. There is an inconvenience that the binding force between them is weak and so-called paper powder is easily generated in which fibers are cut into powder during the processing of the corrugated board material.
[0004]
And the generated paper dust is in a state of adhering to various places of the packaging box (corrugated cardboard box) made of corrugated cardboard material, especially the paper dust existing in the gap (corrugated gap) between the flat papers formed by corrugated paper Since it is difficult to completely remove the cardboard box, a cardboard box that is folded while remaining in the corrugated gap may be shipped. When such a cardboard box is used for packaging of cooked foods such as fresh foods and pizzas, it is induced by vibrations when removing the packaged food from the cardboard box, and the paper powder is drawn from the mouth of the cardboard material. Is likely to be caused on the packaged food.
[0005]
In order to eliminate such inconvenience, a method for suppressing the generation of paper dust from a corrugated cardboard material as described in JP-A-5-162223 is conventionally known. In this paper dust suppression method, an adhesive liquid is sprayed from the end of the corrugated cardboard material into the corrugated gap. By doing so, the paper dust is adhered to the inner wall surface of the corrugated gap, so that the scattering of the paper dust can be prevented.
[0006]
[Problems to be solved by the invention]
However, in the paper dust suppressing method described in the above-mentioned Japanese Patent Application Laid-Open No. 5-162223, an adhesive diluted extremely thin so as to withstand spraying is used. Not only is it difficult to reliably adhere to the inner wall surface of the corrugated gap of the material, but conversely, so-called paper dust balls in which many paper dusts are aggregated via an adhesive are easily formed. Such paper dust balls may be peeled off from the inner wall surface of the corrugated gap by slight vibrations, and are so large that they can be visually recognized. It has the problem that it is.
[0007]
Further, even if the adhesive is sprayed into the corrugated gap from the corrugated surface of the corrugated cardboard material, it is difficult to spread the sprayed adhesive evenly on the inner wall surface of the corrugated gap. There is also a problem in that all of the powder cannot be fixed to the inner wall surface in an even state, and as a result, the spray amount of the adhesive must be increased and the running cost increases.
[0008]
  In view of the above situation, the present invention was obtained by elucidating the mechanism of paper dust generation from cardboard material, and effectively prevents the generation of paper powder from cardboard material at a low cost. can doStepsBall materialCoating equipmentThe purpose is to provide.
[0009]
[Means for Solving the Problems]
  Claim 1Ming is a pair of upper and lower conveyors for conveying the corrugated board materials in the front-rear direction in a coating apparatus for corrugated board material in which a coating agent is applied to the end face of the corrugated board material in a state where a plurality of corrugated board materials are stacked. At least one of the left and right side guide plates for guiding the conveyance of each cardboard material is conveyed above the lower conveyor so that the cardboard material can be sandwiched from above and below. Are arranged along the direction, and at least one of them is movably provided so that each corrugated board material can be sandwiched from the left and right. Further, a roll window is formed on each side guide plate, The roll is supported in a vertically movable manner so that a part of the peripheral surface protrudes inward from the roll window. In addition, each roll is coated. It consists installed supply means for supplyingIt is characterized by that.
[0010]
Most of the generation of paper dust from corrugated board material occurs when the cardboard material is cut, and the paper powder (pre-paper dust) generated at this time is the appropriate dust collection during the processing process of the corrugated board material. In general, it is removed by processing or the like.
[0011]
Therefore, such pre-paper dust is less likely to be a problem. Rather, the corrugated cardboard material has a peripheral structure that interferes with foreign matter during handling after the corrugated cardboard material is processed into a folded cardboard box. Paper dust (post-paper dust) generated by peeling off becomes a problem.
[0012]
Such post-paper dust is generated at the final process of cardboard box manufacture, during transportation after leaving the final process, and when the consumer assembles or uses the cardboard box. Even in a completely removed cardboard box, the occurrence of post-paper dust cannot be suppressed, and the fact is that no countermeasure has been taken against such post-paper dust.
[0013]
According to the first aspect of the present invention, since the outer peripheral edge of the corrugated board material is hardened by application of the coating agent, the corrugated board material is folded or handled during the replacement process, or even the corrugated board material is folded. When the formed folded cardboard box is transported or the like, the outer peripheral edge portion of the cardboard material interferes with foreign matter, so that the inconvenience that the paper structure is collapsed and paper dust is generated is surely prevented.
[0014]
In addition, since the coating agent is applied only to the outer peripheral edge of the corrugated cardboard material, it can be completed with less coating agent compared to the conventional spraying of the coating agent over the entire corrugated space of the corrugated cardboard material. It can contribute to reduction of material cost.
[0015]
  The invention according to claim 2Each roll is formed of a sponge-like foaming synthetic resin.
[0016]
  According to this invention, the coating agentIs formed of sponge-like foaming synthetic resinThe roll is applied to the outer peripheral edge of the cardboard material.BTheButAlong the outer peripheral edgeWhatRollingby doingThe coating agent can be applied uniformly.And laContributes to reduction of the inning cost.
[0017]
In addition, the coating agent is applied only to the part where the peripheral surface of the roll comes into contact, so that uniform application of the coating agent is realized, and it is possible to use a minimum amount of application compared to brush coating or spray coating. Can contribute to lower running costs.
[0018]
  The invention described in claim 3The movable frame is provided with both conveyors, both side guide plates, rolls, and supply means.
[0021]
According to the present invention, the coating agent is applied to the outer peripheral edge portions of a plurality of corrugated board materials stacked by a single application operation using a roll, thereby realizing the efficiency of the coating agent application operation.
[0033]
According to the present invention, the corrugated board material formed by cutting into a predetermined shape according to the use is solidified by the coating agent to which the peripheral portion where paper dust is most likely to be generated is solidified. When developing into a three-dimensional shape or when an article is taken in or out of the three-dimensional shape corrugated cardboard material, the generation of paper dust from the cardboard material is effectively prevented, and the generation of paper dust makes the consumer uncomfortable. In particular, when the article to be packaged is a food immediately after cooking such as pizza before delivery, the food is reliably prevented from becoming unsanitary.
[0034]
DETAILED DESCRIPTION OF THE INVENTION
First, manufacture of a corrugated cardboard box using raw corrugated paper as a raw material will be described. In the following description, the raw corrugated paper B1 (FIG. 1) is a plate-shaped corrugated paper used as a raw material for producing the corrugated box B8, and the printed corrugated paper B2 is the raw corrugated paper. This means that B1 is subjected to predetermined printing. Further, the cut corrugated cardboard sheets B3 and B3 ′ (FIGS. 1 and 5) are obtained by cutting the printed corrugated cardboard sheet B2 into a predetermined shape, and the folded corrugated cardboard materials B4 and B4 ′ are cut cardboard sheets. The paper B3 is folded into a predetermined shape. Further, the bundled cardboard materials B5 and B5 ′ are obtained by stacking and binding a plurality of folded cardboard materials B4, and the paper dust-removed cardboard material B6 is obtained by removing paper dust from the bundled cardboard material B5. It's about things. Further, the product corrugated board materials B7 and B7 ′ are those in which the edge is subjected to a curing process. A so-called cardboard box B8 is formed by assembling the product cardboard materials B7 and B7 ′ into a three-dimensional shape.
[0035]
Therefore, the term “corrugated cardboard material” used in the present specification without a part symbol refers to raw cardboard paper B1, printed cardboard paper B2, cut corrugated cardboard papers B3 and B3 ′, and folded corrugated cardboard from the preceding and following contexts. Any of the materials B4, B4 ', the bundled cardboard materials B5, B5', the paper dust-removed cardboard material B6 and the product cardboard materials B7, B7 ', or a general term for these.
[0036]
FIG. 1 is a process diagram showing a first embodiment of a method for producing a corrugated cardboard material. As shown in this figure, the raw material corrugated paper B1 becomes a product corrugated board material B7 through a printing process P1, a cutting process P2, a folding process P3, a binding process P4, a paper dust removing process P5, and a coating process P6. The cardboard material B7 is shipped as a cardboard product.
[0037]
The printing step P1 is a step of performing a predetermined printing process on the rectangular raw material corrugated paper B1 dimensioned to a predetermined size, and the raw material corrugated paper B1 passes through this step, The printed corrugated paper B2 is subjected to a predetermined printing process.
[0038]
The cutting process P2 is a process of cutting the printed cardboard paper B2 that has been subjected to the printing process in the printing process P1, and the printed cardboard paper B2 fed one by one from the cutting process P2 is a predetermined one. Are cut into a predetermined shape by a cutting device (for example, a press-type cutting device), and a folding line is formed at a predetermined position by a press process.
[0039]
When the final product starting from the raw material corrugated cardboard B1 is, for example, a rectangular parallelepiped cardboard box, the cut corrugated cardboard B3 is rectangular in plan view as shown in the frame of the cutting process P2 in FIG. The two parallel folding lines B31 are formed at predetermined positions in the longitudinal direction (the direction in which the corrugated paper corrugation extends), and the short direction (the direction in which the corrugated paper wave space extends) ), Five parallel vertical folding lines B32 are formed at predetermined positions, and each vertical folding line B32 is formed at an outer position with each horizontal folding line B31 of the cut corrugated cardboard paper B3 as a boundary. A total of eight cut portions B33 are formed along the line.
[0040]
The cut corrugated cardboard B3 is shipped as a product corrugated board material B7 through a coating process P6 which is a final process, and then bent at a right angle along the vertical folding line B32 which is not folded on the user side. Further, each lateral folding line B31 is bent inward to form a cardboard box B8.
[0041]
The folding process P3 is a process of folding the cut corrugated cardboard paper B3 subjected to the cutting process in the cutting process P2, and a predetermined vertical folding line B32 at the center portion and an end portion of the corrugated cardboard paper B3 by a predetermined folding device. After the predetermined vertical folding line B32 is sequentially bent, end portions in the longitudinal direction are joined together by a stable, thereby being folded into an annular shape as shown in the frame of the folding step P3 in FIG. A folded cardboard material B4 is formed.
[0042]
The bundling step P4 is a step of bundling a plurality of folded cardboard materials B4 formed by folding in the folding step P3. In the binding process P4, a plurality (usually 10 to 20) of folded corrugated cardboard materials B4 are sequentially stacked in the same direction, and are bonded by a welding process of the end portions with a synthetic resin band B41. As a result, the bundled cardboard material B5 is formed. Two straps B41 are wound around the strap B41 in parallel with the lateral folding line B31, so that the binding state is stabilized and the end surface in the extending direction of the longitudinal folding line B32 in the bundled cardboard material B5 ( The corrugated paper has a corrugated surface exposed on the (front end).
[0043]
The paper dust removing process P5 is a process for obtaining a corrugated cardboard material B6 from which the paper corrugated cardboard material B5 bundled in the bundling process P4 is subjected to a paper dust removing process. In this paper dust removal step P5, by blowing compressed air from one side of the bundling corrugated cardboard material B5, the paper dust accumulated in the corrugated space of each folded cardboard material B4 formed by corrugated paper, The paper dust adhering to the surface of the binding cardboard material B5 is blown off, and the binding cardboard material B5 becomes the paper dust removed cardboard material B6 free of paper powder.
[0044]
The contaminated air containing paper dust discharged from the other end of the bundling corrugated board material B5 is introduced into a predetermined dust collector and collected, and only clean air from which the paper dust is removed is the system. It is designed to be discharged outside.
[0045]
The coating step P6 is a step of coating the paper dust-removed corrugated cardboard material B6 from which the paper dust has been removed in the paper dust removing step P5, and the paper dust-removed corrugated cardboard material B6 in the coating step P6. The coating agent coating treatment is related to the paper dust generation preventing method of the present invention. That is, the paper dust-removed corrugated board material B6 is shipped as the product corrugated board material B7 in the state where the wood end surface of the paper dust-removed corrugated board material B6 is cured through the coating process P6.
[0046]
The shipped product cardboard material B7 is used for transportation for shipment, assembling on the user side, and for interior of the packaged item in the assembled cardboard box B8, and for the packaged packaged cardboard box. Generation of paper dust from the end of the wood is reliably prevented when taking out from B8.
[0047]
FIG. 2 is a partially cutaway exploded perspective view showing an embodiment of a coating apparatus used in the coating process P6, and FIG. 3 is an assembled perspective view thereof. 4 is a view taken in the direction of arrow A in FIG. As shown in these drawings, the coating apparatus 10 is opposed to a rectangular parallelepiped frame 20 as shown in FIG. 2, a lower roll member 30 as shown in FIG. 1, and an upper side of the lower roll member 30. The upper roll member 40 and the corrugated cardboard holding member 50 disposed on the upper roll member 40 in a state where the upper roll member 40 is held are supported.
[0048]
As shown in FIG. 2, the frame 20 has a rectangular parallelepiped shape in which the front-rear direction (the direction in which the lower roll member 30 extends) is set to be slightly longer than the width direction. A pair of front and rear short frames 22 erected in the width direction between the tops of the columns 21, a pair of widthwise top long frames 23 erected in the front and rear direction, and a width between the bases of the columns 21 in the width direction A pair of short base frames 24 extending in the front-rear direction and a pair of base long frames 25 extending in the front-rear direction are provided.
[0049]
A predetermined number of top erection frames 26 are installed between the pair of long top frames 23, and the upper roll member 40 is suspended and fixed to the top erection frames 26 with the lower part projecting downward. It has come to be. Further, a support plate 27 is installed at an appropriate position between the pair of base long frames 25, and a conveyor drive motor 60 and a guide plate moving motor 70, which will be described later, are installed on the support plate 27.
[0050]
As shown in FIG. 1, the lower roll member 30 includes a lower roll support frame 31 that is long in the front-rear direction, and a plurality of lower rolls 35 supported by the lower roll support frame 31. Configured. The lower roll support frame 31 includes a U-shaped frame 32 positioned on the left side in FIG. 4, a flat frame 33 positioned on the right side, and lower positions of the U-shaped frame 32 and the flat frame 33. And a predetermined number of cross-linked plates 34 cross-linked. The U-shaped frame 32 is fixed to the bridging plate 34 with the opening side facing outward.
[0051]
The lower roll 35 is for conveying the paper dust-removed corrugated board material B6 (FIG. 3), and a predetermined number of the lower rolls 35 are arranged in parallel between the U-shaped frame 32 and the flat frame 33 through a slight gap. As a result, a lower conveyor is formed. Each of the lower rolls 35 is rotated around the axis by the drive of the conveyor drive motor 60, whereby the paper dust-removed corrugated board material B6 placed on the lower rolls 35 is conveyed toward the downstream side. It will be. In the present embodiment, the number of the lower rolls 35 is 24. However, the number of the lower rolls 35 is not limited to 24, and may be less than 24 or 25 or more. Also good.
[0052]
The upper roll member 40 is for sandwiching the corrugated cardboard material B6 from which paper dust has been removed with the lower roll member 30 from above and below, and an upper plate 41 supported by the top construction frame 26 of the frame body 20, Four spiral rods 42 that hang downward from the four corners of the upper plate 41 so as to be rotatable around the shaft center, and these spiral rods 42 are screwed together so that the upper plate 41 can be moved up and down. The upper roll support frame 43 and a plurality of upper rolls 46 arranged in parallel on the upper roll support frame 43 in the front-rear direction.
[0053]
The upper plate 41 is provided with bearing seats 41a corresponding to the spiral rods 42 at the four corners. The upper ends of the spiral rods 42 are inserted into the respective bearing seats 41a so that the upper ends of the spiral rods 42 are prevented from coming off and are rotatable about the axis, and the upper ends of the spiral rods 42 projecting upward from the bearing seats 41a. Is fitted with a pulley 41b that is concentric and integrally rotatable.
[0054]
Further, a support frame elevating motor 80 for elevating the upper roll support frame 43 is vertically installed at a substantially central position of the upper plate 41. A drive pulley 82 is mounted on the drive shaft 81 of the support frame elevating motor 80 so as to be concentric and integrally rotatable, and an endless belt 83 is wound around the drive pulley 82 and the four pulleys 41b. Each spiral rod 42 can be rotated forward and backward through a drive shaft 81, a drive pulley 82, an endless belt 83, and each pulley 41b by driving a support frame elevating motor 80.
[0055]
The upper roll support frame 43 includes a top plate 44 to which the lower ends of the spiral rods 42 are connected, and a pair of side plates 45 projecting downward from both sides in the width direction of the top plate 44. Configured. The width dimension of the upper roll support frame 43 is set to be smaller than the width dimension of the lower roll support frame 31 (in this embodiment, approximately ½ of the width dimension of the lower roll support frame 31).
[0056]
On the top surface 44 of the upper roll support frame 43, nut members 44a are respectively provided at positions corresponding to the spiral rods 42, and the spiral rods 42 are screwed to the nut members 44a, respectively. Accordingly, the upper roll support frame 43 is lifted and lowered via the nut member 44a by rotating the spiral rod 42 forward and backward around the axis center via the endless belt 83 by driving the support frame lifting / lowering motor 80. .
[0057]
The upper roll 46 cooperates with the lower roll 35 on the downstream side while pressing the paper dust-removed corrugated board material B6 fed onto the lower roll 35 of the lower roll member 30 by the lowering of the upper roll member 40. A plurality of side plates 45 are arranged in parallel in the front-rear direction between the pair of side plates 45. In this embodiment, 13 upper rolls 46 are provided. However, the upper roll 46 is not limited to 13 and may be 12 or less, or 14 or more.
[0058]
The corrugated cardboard sandwiching member 50 applies a coating agent to the end surface of the corrugated cardboard material B6 from which the paper dust has been removed while pinching the corrugated cardboard material B6 supplied on the lower roll 35 so as not to be displaced in the width direction. A pair of side guide plates 51 in the width direction, and a separation width changing mechanism 52 that moves the side guide plates 51 forward and backward in the width direction to change the inner dimensions between the side guide plates 51. And a coating agent application roll 55 mounted on each side guide plate 51.
[0059]
The pair of side guide plates 51 is for sandwiching the paper dust-removed cardboard material B6, and by driving the separation width changing mechanism 52 according to the width dimension of the paper dust-removed cardboard material B6, The separation width can be changed. An inclined guide plate 51a inclined so as to gradually increase the separation distance is provided at the upstream end of the side guide plate 51 so as to extend upstream, and the paper dust-removed corrugated cardboard supplied to the upstream end of the lower roll 35 is provided. The material B6 is easily supplied to the space between the side guide plates 51 by being guided by the pair of inclined guide plates 51a.
[0060]
The separation width changing mechanism 52 faces a pair of support members 53 (two pairs in the front-rear direction in total) supporting the side guide plates 51 fixed to the outer surface side of each side guide plate 51 in the width direction. A pair of front and rear screw shafts 54 provided between the support members 53 is provided.
[0061]
The support member 53 includes a nut member 53a into which the screw shaft 54 is screwed and penetrated, and a pair of thin plate-like support pieces 53b erected upward from the nut member 53a. The column piece 53b is dimensioned so that the nut member 53a is separated from the lower edge of the side guide plate 51 at least larger than the diameter dimension of the lower roll 35 while being fixed to the side guide plate 51. .
[0062]
In addition, the inner dimension between the pair of column pieces 53b is set slightly larger than the diameter of the lower roll 35, and the thickness dimension of each column piece 53b is the gap between the adjacent lower rolls 35. The dimension is set to be thinner than the dimension. Therefore, after removing the lower roll 35 sandwiched between the pair of support pieces 53b per nut member 53a and attaching the remaining lower roll 35 between the frames 32 and 33, the removed pair of front and rear lower rolls is removed. 35 is placed on the nut member 53a while being sandwiched between the column pieces 53b, and the screw shafts 54 of the support member 53 in this state are installed at appropriate positions between the frames 32 and 33, and the pair of front and rear lower members are continuously mounted. By mounting the side roll 35 between the frames 32 and 33, the pair of side guide plates 51 are placed on the lower roll 35 as shown in FIG. 2.
[0063]
The screw shaft 54 employs a so-called reverse screw in which the screw spiral direction is screwed in the left and right directions. Therefore, by rotating the screw shaft 54 in one direction, the pair of side guide plates 51 moves toward each other via the support member 53, while rotating in the other direction. The pair of side guide plates 51 moves in a direction away from each other via the support member 53.
[0064]
The coating agent application roll 55 is used to apply a coating agent to the wood end surface of the corrugated cardboard material B6 from which the paper dust has been removed moving between the pair of side guide plates 51 and moving downstream. In the embodiment, it includes a pair of lower application rolls 56 in the width direction and an upper application roll 57. These upper and lower coating rolls 57 and 56 are formed of a sponge-like foaming synthetic resin and can absorb the coating agent well.
[0065]
The lower application roll 56 is partly cut off from the lower roll window 51b in which the lower end portion formed by being cut out so as to extend vertically in the lower half of the position slightly upstream of each side guide plate 51 is open. Is attached to each side guide plate 51 in a state of projecting inward between the side guide plates 51. The upper application roll 57 has a part of the peripheral surface from the upper roll window 51c formed by being drilled so as to extend vertically in the upper half at a position slightly upstream from the lower roll window 51b in each side guide plate 51. The side guide plates 51 are attached to the side guide plates 51 in a state of projecting inwardly between the side guide plates 51.
[0066]
Then, the upper end position of the lower application roll 56 and the lower end position of the upper application roll 57 are set to the same height, thereby generating an uncoated portion of the coating agent on the front end of the paper dust-removed corrugated board material B6. I try not to.
[0067]
A pair of upper and lower support brackets 51d project from a position above the lower roll window 51b on the outer surface side of each side guide plate 51, and a roll support shaft 56a extending in the vertical direction is passed through the support bracket 51d. The lower coating roll 56 is rotatably supported at a portion protruding downward from the roll support shaft 56a. In addition, a pair of support brackets 51e facing up and down so as to sandwich the upper roll window 51c is provided on the upper and lower edges of the upper roll window 51c so as to project outward, and the pair of support brackets 51e. A roll support shaft 57a is supported therebetween. The upper coating roll 57 is pivotally supported around the roll support shaft 57a.
[0068]
Accordingly, the paper dust-removed corrugated board material B6 is conveyed toward the downstream side by driving the lower roll 35 while being sandwiched between the pair of side guide plates 51, whereby the lower coating roll 56 and the upper coating roll. The coating agent absorbed in 57 oozes out and is supplied to the wood end surface of the corrugated cardboard material B6 from which the paper dust has been removed, whereby the wood end surface of the corrugated board material B6 from which the paper dust has been removed is hardened.
[0069]
The separation width changing mechanism 52 configured as described above is configured such that the distance between the side guide plates 51 is adjusted by driving the guide plate moving motor 70. As shown in FIG. 4, the guide plate moving motor 70 is installed on the support plate 27 of the frame body 20, and a drive pulley 72 is concentrically attached to the drive shaft 71 of the guide plate moving motor 70. On the other hand, as shown in FIG. 2, a driven pulley 73 is concentrically fixed to the central portion of the downstream screw shaft 54, and an endless belt 74 is stretched between the driven pulley 73 and the driving pulley 72. The upstream screw shaft 54 is rotated about the shaft center through the drive shaft 71, the drive pulley 72, the endless belt 74 and the driven pulley 73 by the drive of the guide plate moving motor 70.
[0070]
The front and rear screw shafts 54 are fixed with concentric connecting pulleys 75 having the same diameter, and a connecting belt 76 is stretched between the pair of connecting pulleys 75. Accordingly, by driving the guide plate moving motor 70 forward and backward, the pair of front and rear screw shafts 54 rotate forward and backward in the same direction via the connecting belt 76, thereby reducing the distance between the pair of side guide plates 51. It can be adjusted according to the width of the removed corrugated board material B6.
[0071]
The conveyor drive motor 60 is installed on the support plate 27 (FIG. 3) of the frame body 20 in the state of facing the width direction. The drive shaft 61 of the conveyor drive motor 60 protrudes leftward from the lower roll support frame 31, and a pair of drive sprockets 62 are concentrically mounted on the protruding portion so as to be integrally rotatable. .
[0072]
On the other hand, the U-shaped frame 32 of the lower roll support frame 31 has a plurality of driven sprockets 63 supported at appropriate positions so as to be rotatable about a predetermined axis, and the driven sprocket 63 and the inner drive. A lower chain 64 is stretched around the sprocket 62. Further, the lower chain 64 is connected to each lower roll 35 via a driving force transmission member (not shown). Therefore, each lower roll 35 is rotated around the axis by the rotation of the lower chain 64 by the drive of the conveyor drive motor 60, whereby the paper dust-removed cardboard material B6 placed on the lower roll 35 on the upstream side is rotated. Is transferred toward the downstream side.
[0073]
The upper roll support frame 43 is provided with two driven sprockets 65 at positions corresponding to the outer drive sprockets 62, and tension sprockets at the front positions (downstream positions) of these driven sprockets 65. 66 is provided. An upper chain 68 is stretched around the outer drive sprocket 62, the pair of driven sprockets 65 and the tension sprocket 66, and the upper chain 68 is driven around the drive shaft 61 of the drive sprocket 62 driven by the conveyor drive motor 60. It is designed to rotate around.
[0074]
The tension sprocket 66 is urged toward the downstream side by a coil spring 66a, so that the upper chain 68 is always kept in tension even when the upper roll member 40 is moved up and down.
[0075]
Further, one of the driven sprockets 65 (the lower one in the example shown in FIG. 2) is connected to an upper roll driving mechanism 69 whose support shaft 65a drives the upper roll 46, and each upper roll 46 has a support shaft. When the 65a rotates around the axis, it rotates synchronously in the same direction (the direction in which the paper dust-removed corrugated board material B6 is directed downstream).
[0076]
As shown in FIG. 4, a storage tank 90 for storing the coating agent is provided in the vicinity of the coating apparatus 10 configured as described above, and the coating agent stored in the storage tank 90 is disposed in the width direction. A pair of predetermined supply devices 91 for supplying the pair of coating agent application rolls 55 are provided, and the coating agent is supplied to the coating agent application roll 55 by driving these supply devices 91.
[0077]
As the coating agent, an acrylic ester copolymer, a styrene acrylic copolymer, an ethylene / vinyl acetate copolymer, a polyurethane resin, a polyester resin, polyvinyl alcohol, a butadiene rubber latex, or a mixture thereof is used. A composition having a glass transition point in a temperature range of −25 ° C. to 100 ° C. is used.
[0078]
All of these coating agents have good permeability and adhesion to corrugated cardboard materials, and the resulting coating film is tough and excellent in water resistance, so that the paper coated with the coating agent is used. In the wood surface of the corrugated cardboard material B6 from which the powder has been removed, the coating agent quickly penetrates both the corrugated paper and the flat paper holding the corrugated paper, and then quickly dries to harden the wood surface. Excellent as a coating material for corrugated board materials.
[0079]
In addition, these coating agents can be easily diluted with inexpensive solvents such as water and alcohol, except for the so-called oil-based butadiene rubber latex, which contributes to reducing the cost of the coating agent. can do.
[0080]
In addition, oil-based coating agents such as butadiene rubber latex are diluted with organic solvents, but organic solvents are more rapidly drying than water. The inconvenience that the process becomes a bottleneck of all the processes can be avoided, which can contribute to the improvement of productivity.
[0081]
Furthermore, since these coating agents for coating are used in a relatively low temperature range of −25 ° C. to 100 ° C., the coating agent is easily and quickly solidified at a low temperature, and the workability of the coating process is improved. As a result, the influence on the post-process after coating can be minimized.
[0082]
According to the coating apparatus 10 of the first embodiment configured as described above, the paper dust-removed corrugated cardboard material B6 obtained in the paper dust removing step P5 (FIG. 1) is in a state in which the end surface is directed in the width direction Thus, as shown by a two-dot chain line in FIG. It is conveyed toward the downstream side by the rotation, and is introduced between the pair of side guide plates 51 while being guided by the inclined guide plates 51a.
[0083]
Immediately after the paper dust-removed cardboard material B6 is introduced between the pair of side guide plates 51, the upper roll 46 is driven toward the upstream side while the upper surface of the paper dust-removed cardboard material B6 is pressed. As a result, the paper dust-removed corrugated cardboard material B6 is transferred toward the downstream side while being held between the upper and lower rolls 46 and 35.
[0084]
Then, when the paper dust-removed corrugated board material B6 reaches the coating agent application roll 55 (first reaches the lower application roll 56 and then reaches the upper application roll 57), the coating agent application roll 55 (lower application roll). 56 and the upper coating roll 57) are formed of a soft sponge-like foaming synthetic resin, and therefore, the roll support shaft 56a, Rotating around 57a, the impregnated coating agent oozes out and is applied to the wood end surface of the corrugated cardboard material B6 from which paper dust has been removed.
[0085]
Accordingly, the paper dust-removed corrugated board material B6 passes between the pair of side guide plates 51, and becomes a product corrugated board material B7 in a state in which the coating agent is applied to each end face in the width direction. The applied coating agent dries quickly because it is a quick-drying agent. Therefore, there is no inconvenience that paper dust is generated from the product corrugated board material B7 during subsequent handling.
[0086]
Next, a second embodiment of the method for producing a cardboard material will be described. The manufacturing method of the corrugated board material of this embodiment is effective when the printed corrugated board B2 is cut into a complicated shape in the cutting process P2 ′.
[0087]
FIG. 5 is a process diagram showing a second embodiment of a method for producing a corrugated board material. In the second embodiment, the raw corrugated paper B1 is first subjected to the printing process P1 to become the raw corrugated paper B1, and then to the cutting process P2 ′ to become the cut corrugated cardboard B3 ′, and then the folding process P3 and the binding process. By sequentially passing through the process P4, the paper dust removing process P5, and the coating process P6, a folded corrugated cardboard material B4 ′, a bundling corrugated cardboard material B5 ′, and a product corrugated cardboard material B7 ′ are obtained, and the product corrugated cardboard material B7 ′ is shipped as a corrugated cardboard product.
[0088]
The printing process P1, the folding process P3, the bundling process P4, and the paper dust removing process P5 are basically the same as those in the first embodiment. However, in the second embodiment, the hardening process of the peripheral portion with respect to the cardboard material is a cutting process. This is different from the first embodiment in that it is performed at the same time as cutting at P2 ′. Therefore, in 2nd Embodiment, the coating process P6 employ | adopted by previous embodiment does not exist.
[0089]
In the cutting process P2 ′, a thin blade such as a safety razor blade commonly called a Thomson blade is used as a cutting blade. Since such a Thomson blade can be flexibly bent according to various shapes, it is suitable as a cutting blade when the printed corrugated paper B2 is cut into a complicated shape by pressing. At the same time as the cutting process by the cutting blade, a coating agent is applied to the entire outer peripheral surface of the cut corrugated cardboard paper B3 ′.
[0090]
6A and 6B are diagrams showing an embodiment of a cutting member. FIG. 6A is a perspective view, FIG. 6B is a cross-sectional view taken along line XX of FIG. 6A, and FIG. FIG. 4D is a sectional view taken along line ZZ of FIG. As shown in FIGS. 6A to 6C, the cutting member 100 includes a cutting blade 101 made of thin steel and a coating agent holding body 102 attached to the cutting blade 101.
[0091]
The cutting blade 101 is provided with an intersecting groove 103 formed by intersecting a large number of right-up and left-up grooves on the inner surface 104 (the surface of the single blade where the inclined surface 105 is not formed on the blade edge). Yes. The intersecting grooves 103 are for introducing the coating agent from the coating agent holding body 102 by surface tension. The right and left upward grooves are recessed at the same pitch (for example, 2 mm pitch) in the longitudinal direction. The angle is set to 20 ° to 70 ° with respect to the edge of the blade edge. Each groove is a V-shaped groove having a groove angle of 20 ° to 30 ° in the cross-section paper, as shown in FIG.
[0092]
The coating agent holding body 102 is formed of a sponge-like foaming synthetic resin that easily absorbs the coating agent, and is formed into a square material having the same length as the cutting blade 101, and then the inner surface 104 of the cutting blade 101. It is attached to the upper edge by bonding or other means. The cutting blade 101 provided with the coating agent holding body 102 is bent into a predetermined shape so that the inner surface 104 faces the peripheral surface of the cut corrugated cardboard paper B3 ′, thereby forming a die-cutting member 110 (FIG. 5). Is done. The printed corrugated cardboard B2 is cut (cut) by the punching member 110 to obtain a cut corrugated cardboard B3 ′.
[0093]
In addition, the coating agent holder 102 in the punching member 110 is supplied with a coating agent from a storage tank (not shown), and the consumed coating agent is always replenished.
[0094]
According to the above-described cutting process in the cutting process P2 ′, the coating agent from the coating agent holding body 102 is always supplied to the intersecting grooves 103 by the capillary phenomenon on the inner surface side 104 of the cutting blade 101. Therefore, the printed corrugated paper B2 is cut by the cutting blade 101 so that the coating agent supplied to the intersecting grooves 103 on the inner surface side 104 of the cutting blade 101 should become the cut corrugated cardboard B3 ′. The peripheral portion of the cut corrugated cardboard paper B3 ′ obtained by this is cured by the coating agent.
[0095]
In addition, since the intersecting grooves 103 are formed by intersecting inclined grooves, the extending direction of each groove does not coincide with the direction in which the cutting blade 101 descends. Therefore, the intersecting grooves 103 are formed at all cutting edges. Correspondingly, the coating agent can be evenly supplied to the peripheral edge of the cut corrugated cardboard B3 ′.
[0096]
On the other hand, in the case where only the straight groove that matches the processing direction of the cutting blade 101 is provided in the cutting blade 101 instead of the intersecting groove 103, the coating agent is applied only to the cutting edge corresponding to the linear groove during the cutting process. Will be supplied, resulting in problems from the aspect of uniform application of the coating agent.
[0097]
The cut corrugated cardboard B3 ′ obtained in the cutting process P2 ′ has already been coated with a coating agent, so that the peripheral edge is cured over the entire circumference. Therefore, the subsequent folding process P3 and the bundling process are performed. In P4, there is no inconvenience that paper dust is generated from the front end of the folded corrugated cardboard material B4 ′ and the bundling corrugated cardboard material B5 ′. Since the paper dust remaining in the corrugated space is removed, the obtained product corrugated board material B7 'has the generation of paper dust suppressed satisfactorily.
[0098]
As described in detail above, the paper dust generation prevention method according to the present invention mainly prevents the generation of paper dust by focusing on the subsequent paper powder (paper powder generated when handling the product corrugated cardboard materials B7 and B7 '). Since the outer peripheral edge is cured by applying (applying) a coating agent to the outer peripheral edge of the cut corrugated cardboard paper B3, B3 ′, the product corrugated board material B7, Even when the outer peripheral edge of the product corrugated cardboard material B7 interferes with a foreign object during handling or transporting of B7 ′, the paper structure of the outer peripheral edge collapses due to the hardening of the outer peripheral edge. It is possible to reliably prevent inconveniences that occur.
[0099]
In addition, since the coating agent is applied only to the outer peripheral edge of the product corrugated board material B7, B7 ', the coating agent is less in comparison with the coating agent sprayed over the entire corrugated space of the corrugated board material. This can contribute to the reduction of material costs.
[0100]
Further, in the paper dust generation preventing method of the first embodiment, since the coating agent is applied by a roll, the roll is bonded to the corrugated cardboard material B5 even if it is manually performed by the operator. It is possible to apply the coating agent evenly by rolling along the surface of the product and move the product corrugated board material B7 with the outer peripheral edge in contact with the outer peripheral surface of the coating agent application roll 55 as described above. Therefore, it is possible to easily adopt the automatic coating operation to contribute to the reduction of the running cost.
[0101]
Further, by using the roll, uniform coating of the coating agent can be realized, and the minimum application amount can be achieved as compared with brush coating or spray coating, which can contribute to reduction of running cost.
[0102]
Further, a plurality of folded cardboard materials B4 are stacked and bound in the binding step P4, and a coating agent is applied to the end surface of the resulting binding corrugated cardboard material B5, so that they are stacked in a single application operation by the coating agent application roll 55. A plurality of corrugated cardboard materials are subjected to a coating process, thereby realizing an efficient coating agent application operation.
[0103]
Further, in the paper dust generation preventing method of the second embodiment, the coating agent supplied to the cutting blade 101 via the coating agent holding body 102 during the cutting process by the cutting member 100 in the cutting step P2 ′ is printed cardboard paper. Since it is applied to the cutting edge of B2, it is not necessary to provide the coating process P6, which is a dedicated process for applying the coating agent employed in the first embodiment, and the processing of the corrugated board material accordingly. This can contribute to cost reduction.
[0104]
In the second embodiment, the coating agent is applied to the entire circumference of the cut corrugated paper B3 ′ even if the cut shape of the printed corrugated paper B2 is complicated. No unpainted portion is generated, and the generation of paper dust from all edges can be reliably prevented.
[0105]
Since the corrugated cardboard box B8 subjected to such a paper dust generation prevention treatment is solidified by the coating agent to which the peripheral portion where paper dust is most likely to be generated is applied, the folded corrugated cardboard material is developed into a three-dimensional shape. At the time of loading or unloading the article with respect to the three-dimensional cardboard box B8, the generation of paper dust from the cardboard box B8 is effectively prevented, and the generation of the paper powder makes the consumer unpleasant, When the packaged article is a food immediately after cooking such as a pizza before delivery, it is possible to reliably prevent inconvenience that the food becomes unsanitary due to scattered paper powder.
[0106]
The present invention is not limited to the above embodiment, and includes the following contents.
[0107]
(1) In the manufacturing method of the corrugated cardboard material of the first embodiment, the coating agent is applied to the folded corrugated cardboard material B4 formed by folding in the folding step P3. In the manufacturing method of the first embodiment, the folding corrugated cardboard material B4 in a folded state is not limited to being subjected to a coating process. For example, a coating process is interposed between the cutting process P2 and the folding process P3. The coated cardboard paper B3 before folding may be coated.
[0108]
(2) In the first embodiment, the paper dust removing process P5 is set as a pre-process of the coating process P6. However, in the present invention, the paper dust removing process P5 is set as a pre-process of the coating process P6. The paper dust removing process P5 may be a subsequent process of the coating process P6, or may be interposed between the folding process P3 and the bundling process P4.
[0109]
(3) Although the lower application roll 56 and the upper application roll 57 are employed as the coating agent application roll 55 in the first embodiment, the present invention employs the two application rolls 56 and 57. It is not limited to doing, but only one roll may be sufficient.
[0110]
(4) In the second embodiment, a so-called Thomson blade is used as the cutting blade 101 of the cutting member 100. However, the present invention is not limited to the cutting blade 101 being a Thomson blade. A thick normal cutting blade may be used. In this case, the intersecting groove is recessed on the inner surface side of the thick cutting blade.
[0111]
(5) In the second embodiment described above, the intersecting groove 103 is recessed on the inner surface side 104 of the cutting blade 101, but instead of the intersecting groove 103, it is inclined only in one direction with respect to the extending direction of the blade edge. Only an inclined groove may be sufficient, and a zigzag groove or a twisted groove may be sufficient. In short, any groove may be used as long as it does not follow the moving direction when the cutting blade 101 is cut.
[0112]
(6) Silicone antifoaming agents and anti-blocking agents such as silica and paraffin may be added as additives to the coating agent in the above embodiment, and in addition to these, drying accelerators, antioxidants, dispersions You may mix an agent, a filler, etc. Moreover, you may mix a coloring agent in a coating agent. As a result, the surface coated with the coating agent of the corrugated cardboard material B6 from which the paper dust has been removed is colored, and it can be visually confirmed that this portion is cured. Examples of the colorant include organic pigments, inorganic pigments, various dyes, and the like.
[0113]
【The invention's effect】
  Claim 1ClearlyAccording to the present invention, the outer peripheral edge portion is cured by applying a coating agent to the outer peripheral edge portion of the corrugated board material formed by sandwiching the corrugated paper between a pair of flat paper sheets. When handling or when transporting a folded cardboard box formed by folding the cardboard material, the outer periphery of the cardboard material interferes with foreign matter, causing the paper structure to collapse and generate paper dust. Inconveniences can be reliably prevented, and the corrugated cardboard box made of corrugated cardboard material can be made extremely hygienic.
[Brief description of the drawings]
FIG. 1 is a process diagram showing a first embodiment of a method for producing a corrugated board material.
FIG. 2 is a partially cutaway exploded perspective view showing an embodiment of a coating apparatus used in a coating process.
3 is an assembled perspective view of the coating apparatus shown in FIG. 2. FIG.
4 is a view taken in the direction of the arrow A in FIG. 3;
FIG. 5 is a process diagram showing a second embodiment of a method for producing a cardboard material.
6A and 6B are diagrams showing an embodiment of a cutting member, where FIG. 6A is a perspective view, FIG. 6B is a cross-sectional view taken along line XX of FIG. 6A, and FIG. FIG. 4D is a sectional view taken along line ZZ of FIG.
[Explanation of symbols]
10 Coating Equipment 20 Frame
21 Prop 22 Short top frame
23 Top long frame 24 Base short frame
25 Base long frame 26 Top erection frame
27 Support plate 30 Lower roll member
31 Lower roll support frame 32 U-shaped frame
33 Flat frame 34 Bridge plate
35 Lower roll 40 Upper roll member
41 Upper plate 41a Bearing seat
41b Pulley 42 Spiral rod
43 Upper roll support frame 44 Top plate
44a Nut member 45 Side plate
46 Upper roll 50 Cardboard pinching member
51 Side guide plate 51a Inclined guide plate
51b Lower roll window 51c Upper roll window
51d Support bracket 51e Support bracket
52 Separation width changing mechanism 53 Support member
53a Nut member 53b Post piece
54 Screw shaft 55 Coating agent application roll
56 Lower coating roll 56a Roll support shaft
57 Upper coating roll 57a Roll support shaft
60 Conveyor drive motor 61 Drive shaft
62 Drive sprocket 63 Driven sprocket
64 Lower chain 65 Driven sprocket
65a Support shaft 66a Coil spring
66 Tension sprocket
68 Upper chain 69 Upper roll drive mechanism
70 Guide plate moving motor 71 Drive shaft
72 Drive pulley 73 Driven pulley
74 Endless belt 75 Contact pulley
76 Contact belt 80 Support frame lifting motor
81 Drive shaft 82 Drive pulley
83 Endless belt 90 Storage tank
91 Feeder 100 Cutting member
101 Cutting blade 102 Coating agent holder
103 Crossing groove 104 Inner surface side
105 Inclined surface 110 Die-cutting member
B1 Raw material corrugated paper B2 Printed corrugated paper
B3, B3 'Cut corrugated paper
B31 Horizontal folding line B32 Vertical folding line
B33 cutting part B4, B4 'Folding cardboard material
B5, B5 'Bundling cardboard material
B6 Corrugated cardboard with paper dust removed
B7, B7 'product cardboard material
B8 Cardboard box P1 Printing process
P2, P2 'Cutting process P3 Folding process
P4 Bundling process P5 Paper dust removal process
P6 coating process

Claims (3)

In a corrugated board coating apparatus for applying a coating agent to the end face of the corrugated board in a state in which a plurality of corrugated boards are stacked,
  A pair of upper and lower conveyors for conveying each cardboard material in the front-rear direction is provided so that at least one of them can be raised and lowered so that the cardboard material can be sandwiched from above and below,
  In addition, a pair of left and right side guide plates for guiding the conveyance of each corrugated board material is disposed along the conveyance direction above the lower conveyor, and at least so that each corrugated board material can be sandwiched from the left and right. Either one is provided to be movable,
  Furthermore, roll windows are formed on the both side guide plates, and the rolls are supported in a vertically movable manner so that a part of the peripheral surface protrudes inward from each of the roll windows.
  In addition, a corrugated cardboard coating apparatus comprising a supply means for supplying a coating agent to each roll. 2. The corrugated cardboard coating apparatus according to claim 1, wherein each of the rolls is formed of a sponge-like foaming synthetic resin. The corrugated board coating apparatus according to claim 1 or 2, wherein the movable frame is provided with both conveyors, both side guide plates, rolls, and supply means.

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