JP2011195181A - Pallet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pallet formed at lower cost relative to a conventional art although the color of the pallet in the periphery of a fork insertion hole is different from the color of the other portion.SOLUTION: The pallet, as a deck 10 in the shape of a square in a planar view, includes a loading deck 10a, lower deck 10b, and further includes corner girders 30 and intermediate girders 40 as tubular girders for connecting these decks. First injection holes G1 for injecting a first resin material therethrough are provided at parts corresponding to the upper portions of the inner walls 32 of the corner girders 30, the inner walls 42 of the intermediate girders 40, and the inner walls of a central girder 50 of the upper loading deck 10a. On the other hand, second injection holes G2 are provided at parts corresponding to the upper girder outer edges of the outer edges 11 of the upper loading deck 10a.

Description

  The present invention relates to a pallet used to transport a load or the like by a forklift, for example.

  In order to increase the visibility of the fork insertion hole in a pallet used for transporting a load or the like by a forklift, a pallet in which the color of the outer wall is different from the color of other parts has been proposed. For example, Patent Document 1 discloses a technique in which an additional layer having a color different from that of the base material layer is added to the outer surface of the base material layer on the outer wall in which the fork insertion hole is formed.

  Patent Document 1 proposes a molding method using a so-called core back mechanism as a method of adding an additional layer to a base material layer. Specifically, in the method for forming a pallet of Patent Document 1, a base material layer is formed by injecting a first resin material into a first cavity formed by a pair of molds and a tip portion of a core. Thereafter, the second cavity is formed by moving the tip of the core away from the base material layer, and a second resin material having a color different from that of the first resin material is injected into the second cavity to add the additional layer. Is molded.

JP 2006-282277 A.

  Certainly, in the pallet of Patent Document 1, since the color of the additional layer is different from that of the base material layer, the outer wall of the pallet visually recognized by the additional layer can be conspicuous, and the fork insertion hole formed in the outer wall can be noticed. Visibility can be improved. However, in the method for forming a pallet of Patent Document 1, since the core back mechanism is adopted, the shape of the mold including the core is complicated, and equipment for moving the core is also required. Therefore, it is inevitable that the cost of molds and equipment and the maintenance cost thereof will increase. These cost increases eventually lead to an increase in pallet molding costs.

  For example, in the case of the molding method using the core back mechanism of Patent Document 1, the next resin material has to be injected after the previously injected resin material is cured. Therefore, it is necessary to secure the curing time of the previously injected resin material, and the pallet molding cycle becomes long.

  The present invention has been made in view of the circumstances of the prior art, and is a pallet in which the color around the fork insertion hole is different from the color of other parts, but at a lower cost than the prior art, And it aims at providing the pallet which can be shape | molded in a short time.

  In order to achieve the above object, the invention according to claim 1 is molded by injecting a first resin material and a second resin material having a different color into the same cavity, A mounting deck having a quadrangular shape in plan view and a plurality of rectangular cylindrical cylindrical girders connected to the lower side of the mounting deck, and a fork insertion hole is formed between the adjacent cylindrical girders. The mounting deck is configured by a square frame-shaped outer edge formed on an outer edge of the pallet and a mounting portion surrounded by the outer edge, and the cylindrical girder faces outward. A first resin material is injected from the placement portion, and the second resin material is injected from at least one of the outer wall and the outer edge portion. It is characterized by that.

  According to this invention, since at least one of the outer wall and the outer edge located around the fork insertion hole is made of the second resin material having a color different from that of the first resin material, the fork insertion hole can be easily seen. ing. Further, when molding this pallet, a complicated and expensive molding process unlike the core back mechanism is not required. Therefore, the pallet according to the present invention can minimize the increase in molding cost associated with the fork insertion hole while being formed of the second resin material. Moreover, since the injection | pouring timing of 2nd resin material is not restricted after hardening of 1st resin material, it is not necessary to ensure the hardening time of 1st resin material, and a pallet can be shape | molded in a short time.

  Invention of Claim 2 is the pallet of Claim 1, Comprising: While the said outer side wall is comprised with the said 2nd resin material, a part of said inner wall is comprised with the 2nd resin material, In the inner wall, the portion formed of the second resin material is larger on the upper side than on the lower side.

  According to the present invention, since the outer surface of the cylindrical girder and the upper side of the inner wall that are easily collided with the fork are formed of the second resin material, for example, a high strength resin material is used as the second resin material. To prepare for fork collisions.

  Invention of Claim 3 is a pallet of Claim 1 or Claim 2, Comprising: The said outer edge part is located above the girder outer edge part located above the said outer side wall, and the said fork insertion hole. And an insertion hole upper outer edge portion, and the second resin material is injected from the center of the upper surface of the girder outer edge portion.

  According to this invention, since the second resin material is injected from the center of the upper surface of the girder outer edge portion, the second resin material is biased and filled on one side of the outer wall of the girder outer edge portion or the cylindrical girder. Is suppressed. Therefore, the outer edge of the upper girder and the outer wall of the cylindrical girder are almost uniformly made of the second resin material, and the appearance is good.

  Invention of Claim 4 is a pallet as described in any one of Claims 1-3, Comprising: The said outer edge part is an upper outer edge part located above the said outer side wall, and the said fork insertion An upper outer edge portion of the insertion hole positioned above the hole, and a plurality of through holes are formed in the outer edge portion of the beam, and the second outer edge portion of the beam is between the plurality of through holes. It is characterized by being configured by injecting a resin material.

  According to the present invention, the presence of the through hole in the outer edge of the girder makes it difficult for the second resin material to spread in the direction in which the through hole is provided in the surface direction of the mounting deck, while the cylindrical girder in the cavity The portion corresponding to the outer side wall is easily filled with the second resin material. Therefore, it is possible to preferentially configure the outer wall of the cylindrical girder having a high contribution to the visual recognition of the fork insertion hole with the second resin material.

  The pallet of the present invention is a pallet in which the color around the fork insertion hole is different from the color of other parts, but can be molded at a lower cost and in a shorter time.

The perspective view of the pallet in embodiment. The expansion perspective view of the corner girder in an embodiment. The expansion perspective view of the intermediate beam in an embodiment. An enlarged plan view of a corner girder in an embodiment. The enlarged plan view of the middle girder in the embodiment. The schematic cross section which shows the inside of the cavity of the AA cross section equivalent part in FIG. The partial cross section figure of the pallet in the example of a change.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
First, the shape of the pallet of this embodiment will be described. As shown in FIG. 1, the pallet integrally formed by injection molding has a mounting deck 10a and a lower deck 10b as a deck 10 having a square shape in plan view, and a cylindrical shape that connects these decks. A corner girder 30 and an intermediate girder 40 as a girder are provided.

  As shown in FIGS. 1 and 2, a total of four square cylindrical corner girders 30 are provided at each of the four corners of each deck 10 between the pair of decks 10. It is constituted by two outer walls 31 and two inner walls 32. The outer wall 31 of the corner girder 30 is formed so as to face the outside of the pallet, and the outer wall 31 constitutes a side surface of the corner portion of the pallet. Further, the inner wall 32 of the corner girder 30 is formed so as to face the inner side of the pallet. In particular, in this embodiment, the inner wall 32 faces an inner wall 42 of the intermediate beam 40 described later. Is formed. A boundary portion (corner portion) between the outer wall 31 and the inner wall 32 of the corner girder 30 is chamfered to be a chamfered portion 31 a of the outer wall 31. Further, the lateral width W1 of the outer wall 31 of the corner girder 30 is formed substantially equal to the lateral width W2 of the outer wall 41 of the intermediate girder 40 described later. In the present embodiment, the outer wall 31 (including the chamfered portion 31a) and the inner wall 32 are formed to have the same thickness N1, and the thickness N1 is the outer edge portion 11 of the mounting deck 10a described later. Is set to be thicker than the thickness N2.

  As shown in FIGS. 1 and 3, a total of four square cylindrical intermediate girders 40 are provided between the pair of decks 10 in the middle between the corners and the corners. And one outer wall 41 facing the outside of the pallet, and three inner walls 42 facing the inside of the pallet. The outer wall 41 of the intermediate beam 40 is formed so as to face the outside of the pallet, and the outer wall 41 constitutes a side surface of the pallet. Further, the inner wall 42 of the intermediate beam 40 is formed so as to face the inside of the pallet, and the two inner walls 42 adjacent to the outer wall 41 face the inner wall 32 of the corner beam 30. In addition to being formed, one of the inner walls 42 is formed so as to face an inner wall of a central beam 50 described later. A boundary portion (corner portion) between the outer wall 41 and the inner wall 42 is chamfered to be a chamfered portion 41 a of the outer wall 41. In the present embodiment, the outer wall 41 (including the chamfered portion 41a) and the inner wall 42 are formed to have the same thickness N1 as the outer wall 31 and the inner wall 32 of the corner beam 30. Further, the lateral width W2 of the outer wall 41 of the intermediate beam 40 is formed substantially the same as the lateral width W1 of the outer wall 31 of the corner beam 30.

  The corner girder 30 and the intermediate girder 40 form a fork insertion hole F in the pallet. That is, as shown in FIG. 1, a pair of fork insertion holes F for inserting forks such as forklifts are opened on each side of the pallet by the intermediate beam 40 and the corner beam 30 adjacent to the intermediate beam 40. Yes.

  As shown in FIG. 1, the pallet according to the present embodiment is provided with a central girder 50 that connects the pair of decks 10 in addition to the corner girder 30 and the intermediate girder 40. One square cylindrical central girder 50 is provided at the center (the center of the quadrangle) of the pair of decks 10 and all four side walls thereof are formed as inner side walls. The four inner walls of the central beam 50 are formed so as to face the inner wall 42 of the intermediate beam 40, respectively. In FIG. 1, most of the central girder 50 is not shown by the mounting deck 10 a.

  On the other hand, as shown in FIG. 1, the mounting deck 10 a disposed on the upper side includes a rectangular frame-shaped outer edge portion 11 formed on the outer edge thereof, and a mounting portion 21 surrounded by the outer edge portion 11. ing. The outer edge portion 11 extends along each side of the mounting deck 10a having a quadrangular shape in plan view. And the outer edge rail is extended along the inner edge (the square center side) of the outer edge part 11. That is, in the present embodiment, the outer edge portion 11 is formed from the outer edge of the mounting deck 10a to the outermost outer edge rail of the mounting deck 10a. Further, the thickness N2 (the thickness in the vertical direction) of the outer edge portion 11 of the mounting deck 10a is the thickness N1 of the outer wall 31 and inner wall 32 of the corner beam 30 (the outer wall 41 and inner wall of the intermediate beam 41). 42 is set to be thinner than the wall thickness N1).

  As shown in FIG. 1, the outer edge portion 11 formed in this way is constituted by a girder outer edge portion and an insertion hole upper outer edge portion 15. Specifically, the corner girder upper outer edge portion 12 as the girder outer edge portion is located above each of the two outer walls 31 in the corner girder 30, and one corresponding to one outer wall 31. There are 8 places each. The intermediate girder upper outer edge portion 13 is located above the outer wall 41 of the intermediate girder 40 and is provided in a total of four locations. That is, in the pallet of the present embodiment, a total of 12 upper digit outer edge portions are provided.

  Further, as shown in FIGS. 2 and 4, a pair of through-holes formed in the shape of a long square along the extending direction of the corner-girder upper outer edge portion 12 is formed in the outer edge portion 12 on the corner girder of the outer edge portion 11. A hole 12a is formed. The length of the pair of through holes 12a in the short direction is set to approximately ½ of the length of the corner girder outer edge 12 in the short direction, and the pair of through holes 12a are the corners. It opens to the inside of the beam 30. That is, the pair of through-holes 12 a are arranged on the center side (center side of the mounting deck 10 a) with respect to the inner surface of the outer wall 31 of the corner girder 30. In FIG. 4, the position of the outer wall 31 is indicated by a broken line.

  The length of the pair of through holes 12a in the longitudinal direction is formed to be about 1/3 of the length of the corner girder outer edge 12 in the longitudinal direction. And a pair of through-hole 12a is formed with the predetermined space | interval on both sides of the extension direction center of the corner part top outer edge part 12. As shown in FIG. The interval between the pair of through holes 12a is set to an interval that allows injection of a second resin material, which will be described later, and between the pair of through holes 12a in the upper edge portion 12 of the corner girder, Two injection traces T2 are formed.

  As shown in FIGS. 3 and 5, a pair of through-holes 13 a formed in an oblong shape along the extending direction of the intermediate girder upper outer edge portion 13 is formed in the upper outer edge portion 13 of the intermediate girder 11 of the outer edge portion 11. Has been. The length of the pair of through holes 13a in the short direction is set to approximately ½ of the length of the intermediate girder upper outer edge portion 13 in the short direction, and the pair of through holes 13a is provided in the middle girder 40. It is designed to open inside. That is, the pair of through-holes 13 a are arranged on the center side (center side of the mounting deck 10 a) with respect to the inner surface of the outer wall 41 of the intermediate beam 40. In FIG. 5, the position of the outer wall 31 is indicated by a broken line.

  Further, the length of the pair of through holes 13a in the longitudinal direction is formed to be about 1/3 of the length of the intermediate girder upper outer edge portion 13 in the longitudinal direction. And a pair of through-hole 13a is formed with the predetermined space | interval on both sides of the extension direction center of the intermediate girder upper outer edge part 13. As shown in FIG. The interval between the pair of through-holes 13a is set to an interval that allows the injection of a second resin material, which will be described later. Two injection traces T2 are formed.

  As shown in FIG. 1, the mounting part 21 surrounded by the outer edge part 11 is provided with the beam in a girder located inside each girder. Specifically, as shown in FIGS. 2 and 4, the corner beam inner rail 22 positioned inside the corner beam 30 is formed to have a right triangle shape in plan view. The corner girder inner rail 22 is extended so that the adjacent sides of the right-angled triangle in plan view are parallel to the upper edge 12 of the corner girder, and the hypotenuse of the right-angled triangle in plan view is the corner girder 30. The inner surfaces of the two inner walls 32 are connected to each other. Further, as shown in FIG. 4, the corner beam inner beam 22 is provided to be separated from the corner beam upper outer edge portion 12, and the corner beam inner beam 22, the corner beam upper outer edge portion 12, and the like. Between these, a substantially L-shaped gap K1 is formed. The right-angled corner of the corner beam 22 is connected to the corner portion of the outer edge 11 by a corner beam rib 23. That is, when viewed in plan, the substantially L-shaped gap K1 is divided into two by the corner girder ribs 23. In the present embodiment, the corner beam upper outer edge portion 12 is connected to the corner beam inner beam 22 only by the corner beam inner rib 23 at one end thereof.

  On the other hand, as shown in FIGS. 3 and 5, the intermediate beam inner rail 24 positioned inside the intermediate beam 40 is formed to have a right triangle shape in plan view. The intermediate girder inner frame 24 having a right-angled triangular shape in plan view is extended so that the oblique side of the right-angled triangle in plan view is parallel to the upper outer edge portion 13 of the intermediate girder, and the adjacent side of the right-angled triangle in plan view is The inner wall 42 adjacent to the outer wall 41 of the intermediate beam 40 and the inner wall 42 facing the outer wall 41 are connected to each other. Further, as shown in FIG. 5, the intermediate girder inner beam 24 is provided to be separated from the intermediate girder upper outer edge portion 13, and between the intermediate girder inner beam 24 and the intermediate girder upper outer edge portion 13. A substantially linear gap K2 is formed. The hypotenuse of the intermediate beam inner beam 24 is connected to the upper outer edge portion 13 of the intermediate beam of the outer edge portion 11 by two intermediate beam inner ribs 25. That is, when viewed in plan, the substantially linear gap K2 is divided into three equal parts by the two intermediate girder ribs 25. These two intermediate girder inner ribs 25 are connected to the inside of the upper girder upper outer edge portion 13 where the through hole 13a is formed. In the present embodiment, the intermediate girder upper outer edge portion 13 is connected to the intermediate girder inner beam 24 only by two middle girder inner ribs 25.

  As shown in FIG. 1, the center beam inner cross located inside the center beam 50 is formed to extend in a square shape. Each corner portion of the square central girder beam is connected to the inner wall of the central girder.

  As shown in FIG. 1, the inner wall 42 facing the inner wall of the center beam 50 among the inner walls 42 of each intermediate beam 40 and the inner wall of the center beam 50 are connected by an inter-beam bar 28. In other words, the cross beam 28 is formed in a cross shape so as to extend to each intermediate beam 40 with the center beam 50 as the center. A plurality of connection bars 29 are provided in a grid pattern at portions other than the cross beams and the cross beams 28.

  In the present embodiment, the lower deck 10b disposed on the lower side includes a plurality of bars formed in a lattice shape in the region between the corner beam 30 and the intermediate beam 40, the intermediate beam 40, and the central beam 50. It is formed by the crosspiece which connects. On the other hand, the space surrounded by the corner girder 30 and the central girder 50, and the pair of intermediate girder 40 and the beam connecting these girder is a void. That is, the pallet in the present embodiment is a pallet that assumes that a load or the like is placed on the upper placement deck 10a.

  The pallet formed as described above includes a first resin material and a second resin material having a color different from that of the first resin material. In the present embodiment, a dark regenerated material is used as the first resin material, and a bright (for example, red, blue, yellow) virgin material is used as the second resin material. In FIG. 1 to FIG. 3, the portion constituted by the first resin material is illustrated in white (colorless), and the portion constituted by the second resin material is colored and illustrated.

  As shown in FIGS. 1 to 3, in the pallet of this embodiment, among the girders, almost all of the outer wall 31 of the corner girder 30 and the outer wall 41 of the intermediate girder 40 are made of the second resin material. ing. Therefore, in this embodiment, the outer side wall 31 of the corner girder 30 and the outer side wall 41 of the intermediate girder 40 that are located on both sides of the fork insertion hole F and constitute the side wall of the pallet are made of the light second resin material. It is configured.

  Further, a part of the two inner side walls 32 of the corner girder 30 and a part of the two inner side walls 42 adjacent to the outer side wall 41 among the three inner side walls of the intermediate girder 40 are made of the second resin material. . In the inner side wall 32 of the corner girder 30 and the inner side wall 42 of the intermediate girder 40, the portion formed of the second resin material is larger on the upper side than on the lower side. That is, the second resin material reaches the center side of the pallet (the center side of the mounting deck 10a having a square shape in plan view) as it goes upward.

  On the other hand, as shown in FIGS. 1 to 3, the outer edge portion 11 of the upper mounting deck 10 a is almost entirely composed of the upper edge portion 12 on the corner girder and the upper outer edge portion 13 on the intermediate girder by the second resin material. ing. And although the insertion hole upper outer edge portion 15 is formed of the first resin material at the center portion, a part on the corner beam upper outer edge portion 12 side and a portion on the intermediate beam upper outer edge portion 13 side are formed of the second resin material. It is configured.

  Further, in the placement portion 21 of the upper placement deck 10a, almost all of the corner girder ribs 23 are made of the second resin material. The corner girder beam 22 is made of a second resin material, with a portion (a right-angled portion of the right-angled triangle in plan view) to which the corner girder rib 23 is connected as the center. Further, in the placement portion 21 of the upper placement deck 10a, almost all the intermediate girder ribs 25 are made of the second resin material. A part of the intermediate girder beam 24 is composed of the second resin material with a portion (slanted side portion) to which the intermediate girder rib 25 is connected as a center. In the pallet of this embodiment, at the boundary between the first resin material and the second resin material, the materials are mixed with each other to form a non-linear shape or a non-planar shape.

Next, a method for forming the pallet will be described.
The mold 60 used in the pallet molding method of the present embodiment is configured so that a cavity corresponding to the shape of the pallet is formed by clamping the mold. A first injection hole G1 for injecting the first resin material and a second injection hole G2 for injecting the second resin material are formed at predetermined positions of the mold 60. In FIG. 1, in order to illustrate the positional relationship between the pallet and each injection hole in the mold 60, the position of the first injection hole G1 is schematically illustrated with a white arrow, and the second injection hole G2 is illustrated. Is schematically shown by a black arrow.

  As shown in FIG. 1, in the mold 60, the first injection hole G <b> 1 has an inner wall 32 of the corner girder 30 of the upper mounting deck 10 a, an inner wall 42 of the intermediate girder 40, and an inner wall of the central girder 50. It is provided in the part equivalent to the upper part of. In particular, in the present embodiment, when the upper mounting deck 10a is viewed in plan, the corner portion where the inner wall 32 and the inner wall 32 of the corner beam 30 are in contact, and the inner wall facing the outer wall 41 of the intermediate beam 40 A total of 16 first injection holes G1 are provided at each of the four corner portions where both end portions of 42 and the inner wall and the inner wall of the central beam 50 contact each other.

  Moreover, as shown in FIG. 1, the 2nd injection hole G2 is provided in the part corresponding to a digit upper edge part among the outer edge parts 11 of the upper mounting deck 10a in the metal mold | die 60. As shown in FIG. Specifically, as shown in FIGS. 1 and 6, the second injection hole G2 is a portion between the pair of through holes 12a in the portion C12 corresponding to each corner girder outer edge 12 in the cavity. In addition, the opening is directed to the inside of the thickness N1 of the outer wall 31 of the corner girder 30. Similarly, the second injection hole G <b> 2 is a portion between the pair of through holes 13 a among the portions corresponding to the upper outer edge portions 13 of the intermediate girders in the cavity, and the wall of the outer wall 41 of the intermediate girders 40. The opening is directed in the range of the thickness N1. In this way, a total of 12 second injection holes G2 are provided in each of the portions corresponding to the eight corner girder upper outer edge portions 12 and the four middle girder upper outer edge portions 13 respectively.

  In this way, the mold 60 in which the first injection hole G1 and the second injection hole G2 are formed is clamped in the mold clamping step, thereby forming a cavity corresponding to the shape of the pallet described above. Next, as the first resin material injection step, the first resin material is injected into the cavity from the first injection hole G1.

  On the other hand, as the second resin material injection step, the second resin material is injected into the cavity from the second injection hole G2. The injection of the second resin material from the second injection hole G2 is performed after the injection of the first resin material from the first injection hole G1 is started and before the injection of the first resin material is finished (for example, the first resin material). A few seconds after the injection of the material). Therefore, before the first resin material is completely cured, the first resin material and the second resin material come into contact with each other in the cavity, and the materials are mixed with each other at the boundary between the first resin material and the second resin material. Accordingly, the boundary surface is non-planar.

  Each resin material is injected from the first injection hole G1 and the second injection hole G2, and after the resin materials are cured, the mold 60 that has been clamped is opened, and a molded product (pallet) is taken out. At this time, an unnecessary part is formed in the part in which the first injection hole G1 and the second injection hole G2 were provided in the molded product. By cutting and removing this unnecessary portion, a final pallet is formed. At this time, the cutting trace remains on the pallet as the unnecessary portion is cut. That is, in the pallet of this embodiment, the first injection trace T1 is formed in the portion where the first resin material is injected, and the second injection trace T2 is formed in the portion where the second resin material is injected. . In FIGS. 4 and 5, the first injection trace T1 and the second injection trace T2 are indicated by black circles.

Next, the injection | pouring aspect of each resin material at the time of shaping | molding of a pallet is demonstrated.
As described above, since the position of the first injection hole G1 is set in a portion corresponding to the upper side of the inner wall of each cylindrical beam, the first resin material is placed inside each cylindrical beam in the cavity. It will be filled from the mounting part 21 of the wall and the upper mounting deck 10a.

  On the other hand, as shown in FIGS. 4 and 6, the second injection hole G2 (shown as the second injection trace T2 in FIG. 4) is a part of the portion C12 corresponding to the upper edge 12 of each corner girder in the cavity. Of these, a portion between the pair of through-holes 12 a, that is, the center of each corner girder outer edge portion 12 is provided. Therefore, the second resin material injected from the second injection hole G <b> 2 is suppressed from being charged in one direction in the extending direction of the upper edge portion 12 of the corner girder, and the outer wall of the corner girder 30 is suppressed. 31 is comprised by the 2nd resin material substantially equally on either side.

  Further, as shown in FIG. 6, the second injection hole G2 is a portion C12 corresponding to the upper edge 12 of each corner girder in the cavity, and the range of the thickness N1 of the outer wall 31 of the corner girder 30 Opening is directed to the inside. Further, the thickness N1 of the outer wall 31 of the corner girder 30 is formed thicker than the thickness N2 of the corner girder upper outer edge portion 12, and a portion C12 corresponding to the corner girder upper outer edge portion 12 in the cavity. The channel cross-sectional area of the portion C31 corresponding to the outer wall 31 of the corner girder 30 is formed larger than the channel cross-sectional area. Therefore, the second resin material filled from the second injection hole G2 is more easily filled into the portion C31 corresponding to the outer wall 31 of the corner beam 30 and the outer wall 31 of the corner beam 30 is more reliably filled. It is comprised by the 2nd resin material.

  Further, as shown in FIG. 4, a pair of second injection holes G2 (shown as second injection traces T2 in FIG. 4) provided in a portion C12 corresponding to the upper edge portion 12 of the corner girder in the cavity. Are provided in a portion between the through holes 12a. The portions corresponding to the pair of through holes 12a are occupied by the mold 60 at the time of molding, and are portions that do not form a flow path for the resin material. The horizontal cross-sectional area of the portion C12 corresponding to the upper outer edge portion 12 is reduced.

  In particular, in the present embodiment, the length in the short direction of the pair of through holes 12a is formed to be approximately ½ of the length in the short direction of the upper outer edge portion 12 of the corner girder. In the formed portion, the horizontal channel cross-sectional area (the total of the channel cross-sectional areas) is also approximately ½. Further, the length of the pair of through holes 12a in the longitudinal direction is formed to be approximately 1/3 of the length of the corner girder outer edge 12 in the longitudinal direction, and the corresponding length is secured. For these reasons, in order for the second resin material injected from the second injection hole G2 (second injection trace T2) to reach the corner portion of the outer edge portion 11 and the outer edge portion 15 on the insertion hole, the flow path is interrupted. The part with a small area must go through a corresponding length. Therefore, it is difficult for the second resin material to reach the corner portion of the outer edge portion 11 and the outer edge portion 15 on the insertion hole. On the other hand, as shown in FIG. 4, the pair of through holes 12 a are disposed closer to the center than the inner surface of the outer wall 31 of the corner girder 30. The flow path from the two injection holes G2 to the portion C31 corresponding to the outer wall 31 is not narrowed.

  In addition, as shown in FIGS. 4 and 6, due to the presence of the gap K1, the outer edge portion 12 on the corner girder and the inner beam 22 of the corner girder are substantially separated from each other. They are connected only by the ribs 23. Accordingly, the second resin material injected from the second injection hole G2 (second injection trace T2) reaches the corner girder inner beam 22 only through the portion corresponding to the corner girder inner rib 23, and the corner An excessive amount of the second resin material is suppressed from being filled in the portion corresponding to the cross beam 22. Further, as described above, the presence of the through hole 12a makes it difficult for the second resin material to reach the corner portion of the outer edge portion 11 and the corner girder inner rib 23 connected thereto. That is, the presence of the through-hole 12a also suppresses the portion corresponding to the corner beam inner beam 22 from being filled with an excessively large amount of the second resin material. This point also suppresses the first resin material from spreading to the corner girder outer edge 12 side due to the presence of the gap K1. In FIG. 6, a portion corresponding to the gap portion K <b> 1 in the mold 60 is illustrated with a broken line.

  Similarly, as shown in FIG. 5, the second injection hole G <b> 2 (shown as the second injection trace T <b> 2 in FIG. 5) is a pair of penetrations among the portions corresponding to the upper edge portions 13 of the intermediate girders in the cavity. A portion between the holes 12a, that is, the center of the upper outer edge portion 13 of each intermediate beam is provided. Therefore, the second resin material injected from the second injection hole G2 is suppressed from being charged in one direction in the extending direction of the intermediate girder upper outer edge portion 13, and the outer wall 41 of the intermediate girder 40 is suppressed. It is constituted by the second resin material substantially equally on the left and right.

  Further, the second injection hole G2 is a portion corresponding to the upper outer edge portion 13 of each intermediate beam in the cavity, and is opened so as to be directed within the range of the thickness N1 of the outer wall 41 of the intermediate beam 40. . Furthermore, the wall thickness N1 of the outer wall 41 of the intermediate beam 40 is formed to be larger than the wall thickness N2 of the upper outer edge portion 13 of the intermediate beam. The flow passage cross-sectional area of the portion corresponding to the outer wall 41 of the intermediate beam 40 is larger than the area. Therefore, the second resin material filled from the second injection hole G2 is more easily filled in the portion corresponding to the outer wall 41 of the intermediate beam 40, and the outer wall 41 of the intermediate beam 40 is more reliably filled with the second resin. Consists of materials.

  Further, as shown in FIG. 5, a second injection hole G2 (shown as a second injection trace T2 in FIG. 5) provided in a portion corresponding to the upper outer edge portion 13 of the intermediate beam in the cavity is a pair of penetrations. It is provided in a portion between the holes 12a. In the present embodiment, the length in the short direction of the pair of through holes 13a is equal to the length in the short direction of the upper outer edge portion 13 of the intermediate girder in the same manner as the through hole 12a of the corner girder upper outer edge portion 12 described above. The length of the pair of through-holes 13a in the longitudinal direction is formed to be approximately 1/3 of the length of the intermediate girder upper outer edge portion 13 in the longitudinal direction. Therefore, in order for the second resin material injected from the second injection hole G2 (second injection trace T2) to reach the insertion hole upper outer edge portion 15, a portion having a small flow path cross-sectional area is extended over a corresponding length. The second resin material is difficult to reach the upper edge 15 of the insertion hole. On the other hand, as shown in FIG. 5, the pair of through holes 13 a are arranged closer to the center side than the inner surface of the outer wall 41 of the intermediate beam 40, so that the second The flow path from the injection hole G2 to the outer wall 41 is not narrowed.

  In addition, as shown in FIG. 5, due to the presence of the gap K <b> 2, the intermediate girder upper outer edge portion 13 and the intermediate girder inner rail 24 are in a state of being substantially separated from each other. It is connected. Therefore, the second resin material injected from the second injection hole G2 (second injection trace T2) reaches the intermediate beam inner beam 24 only through the portion corresponding to the ribs 25 in the intermediate beam. An excessive amount of the second resin material is prevented from being filled in a portion corresponding to the crosspiece 24. This also suppresses the first resin material from spreading to the intermediate girder upper outer edge 13 side due to the presence of the gap K2. Furthermore, as described above, due to the presence of the through-hole 13a, the horizontal cross-sectional area of the upper outer edge portion 13 of the intermediate beam is reduced, and the second resin material hardly reaches the portion corresponding to the rib 25 in the intermediate beam. It has become. That is, the presence of the through-hole 13a also suppresses the portion corresponding to the corner beam inner beam 22 from being filled with an excessive amount of the second resin material.

According to the pallet and the pallet forming method of the above embodiment, the following effects can be obtained.
(1) According to the pallet of this embodiment, the fork insertion hole F is visually recognized because the outer wall 31 of the corner girder 30 and the outer wall 41 of the intermediate girder 40 are made of the light second resin material. It is easy to do. Further, in forming the pallet of the present embodiment, a complicated and expensive forming method such as the core back mechanism described in Patent Document 1 is not required. Therefore, it is possible to minimize an increase in molding cost associated with the configuration of the outer wall 31 of the corner beam 30 and the outer wall 41 of the intermediate beam 40 with the second resin material.

  Also, for example, in the case of the molding method using the core back mechanism of Patent Document 1, after the previously injected resin material is completely cured, the next resin material must be injected, and the previously injected resin material It is necessary to secure the curing time of the pallet, and the time required for the entire pallet molding is correspondingly long. In the above embodiment, since the injection of the second resin material is started before the injection of the first resin material, that is, before the first resin material is completely cured, the curing time of the first resin material is ensured. There is no need, and the pallet can be formed in a short time.

  Further, in the injection molding, since the resin material has an appropriate viscosity and the injection pressure is limited, there is a limit to reducing the thickness. And in the case of the shaping | molding method using the core back mechanism of patent document 1, since it is a 2 layer structure of a base material layer and an additional layer, the thickness of the outer wall which match | combined these 2 layers tends to become thick. In the above embodiment, since it is not necessary to adopt a two-layer structure in the outer wall 31 of the corner beam 30 and the outer wall 41 of the intermediate beam 40, the thickness of each outer wall can be made relatively thin, Contributes to weight reduction of pallets.

  (2) In the present embodiment, the two inner side walls 32 of the corner girder 30 and the two inner side walls 42 adjacent to the outer wall 41 among the three inner side walls of the intermediate girder 40 are located on the upper side of the lower side. The part comprised by 2nd resin material is large. For example, when a fork is inserted into the fork insertion hole F of the pallet of the present embodiment and lifted, the side end of the fork may collide with the upper side of each inner wall described above. By configuring the upper side of each inner wall with the second resin material having a relatively high strength with a virgin material, it is possible to ensure the strength against fork collision or the like.

  (3) Since the second injection hole G2 is provided in the center of the corner girder upper outer edge portion 12 and the middle girder upper outer edge portion 13, the outer wall 31 of the corner girder 30 and the outer wall of the intermediate girder 40 41 is restrained from being biased to one of the sides and formed of the second resin material, and can be configured substantially equally on the left and right. Moreover, the 2nd injection hole G2 is provided in the part corresponded to the corner girder upper outer edge part 12 between a pair of through-holes 12a, or the intermediate girder upper outer edge part 13 between a pair of through-holes 13a. The presence of the through-holes 12a and the through-holes 13a reduces the horizontal channel cross-sectional area of the upper edge of each girder, and the second resin material is used for the corner portion of the outer edge 11 and the corner girder rib 23. It is difficult to reach the portion corresponding to the upper edge 15 of the insertion hole. On the other hand, since each through-hole does not affect the channel cross-sectional area in the vertical direction, the second resin material tends to reach the portion corresponding to each outer wall. Therefore, the outer wall 31 of the corner girder 30 and the outer wall 41 of the intermediate girder 40, which have a high contribution to the visual recognition of the fork insertion hole F, can be preferentially configured by the second resin material.

  (4) In the present embodiment, the thickness N1 of the outer wall 31 of the corner girder 30 is set to be thicker than the thickness N2 of the outer edge portion 11 (corner girder upper outer edge portion 12). The portion C31 corresponding to the outer wall 31 of the corner beam 30 is preferentially filled with the second resin material. In addition, since the second injection hole G2 is opened at the corner girder upper outer edge portion 12 so as to be directed within the range of the thickness N1 of the outer wall 31 of the corner girder 30, the second injection hole G2 is injected from the second injection hole G2. The second resin material is quickly filled in the outer wall 31 of the corner beam 30. From these things, the outer wall 31 of the corner girder 30 can be reliably comprised with the 2nd resin material. The same applies to the outer wall 41 of the intermediate beam 40.

  (5) In this embodiment, the corner girder upper outer edge portion 12 and the corner girder inner rail 22 are in a substantially spaced state due to the presence of the gap K1, and these are only by the corner girder inner ribs 23. It is connected. Accordingly, the second resin material injected from the second injection hole G2 (second injection trace T2) reaches the corner girder inner beam 22 only through the portion corresponding to the corner girder inner rib 23, and the corner An excessive amount of the second resin material is suppressed from being filled in the portion corresponding to the cross beam 22.

  Similarly, the intermediate girder upper outer edge portion 13 and the intermediate girder inner rail 24 are in a state of being substantially separated by the presence of the gap K <b> 2, and these are connected only by the two middle girder inner ribs 25. Therefore, the second resin material injected from the second injection hole G2 (second injection trace T2) reaches the intermediate beam inner beam 24 only through the portion corresponding to the ribs 25 in the intermediate beam. An excessive amount of the second resin material is prevented from being filled in a portion corresponding to the crosspiece 24.

  (6) In the pallet of this embodiment, at the boundary between the first resin material and the second resin material, the materials are mixed with each other, and the boundary surface is non-planar. Therefore, it can suppress that the situation where the 1st resin material and the 2nd resin material peel will generate | occur | produce, and the improvement of the joint strength of a 1st resin material and a 2nd resin material is realizable.

  (7) In the pallet molding method of the present embodiment, the injection of the second resin material is started before the injection of the first resin material is finished after the injection of the first resin material is started. Therefore, before the first resin material is completely cured, the first resin material and the second resin material come into contact with each other, and these boundaries can be easily made non-linear or non-planar. Specifically, for example, when the boundary line between the first resin material and the second resin material in the upper edge 15 of the insertion hole is visually recognized, the boundary line is visually recognized in a curved shape. In addition, the boundary surface between the first resin material and the second resin material is also non-planar inside the insertion hole upper outer edge portion 15. Thus, by making the boundary between the first resin material and the second resin material non-linear and non-planar, the bonding strength between the two resins can be improved.

  (8) In the above embodiment, not only the corner beam upper outer edge portion 12 and the intermediate beam upper outer edge portion 13 but also a part of the insertion hole upper outer edge portion 15 is constituted by the second resin material, and the outer edge of the mounting deck 10a. Most of the portion 11 is made of the second resin material. And as a 2nd resin material, the comparatively high intensity | strength virgin material is employ | adopted. Therefore, the bending strength etc. in the outer edge part 11 of the mounting deck 10a can be improved.

  (9) In the above embodiment, the outer wall 31 of the corner beam 30 and the outer wall 41 of the intermediate beam 40 have substantially the same thickness N1. Further, the lateral width W1 of the outer wall 31 of the corner girder 30 and the lateral width W2 of the outer wall 41 of the intermediate girder 40 are substantially equal. Therefore, when the outer wall 31 and the outer wall 41 are similarly configured with the second resin material, the amount of the second resin material injected into the outer wall 31 of the corner beam 30 and the outer wall 41 of the intermediate beam 40 is The injection pressure can be made the same, and there is no need to set different amounts of the second resin material, the injection pressure, etc. for each second injection hole G2. Therefore, molding defects such as short shots can be suppressed, and the second resin material can be reliably injected without using a valve gate or the like.

  (10) In the above embodiment, 12 second injection holes G2 are provided for 16 first injection holes G1, and the number of second injection holes G2 is made smaller than the number of first injection holes G1. Yes. Therefore, the amount of the second resin material, which is a relatively expensive virgin material, can be reduced, which can contribute to cost reduction of the pallet.

In addition, the said embodiment may be changed as follows and may apply it combining the following modifications.
-The position in which the 2nd injection hole G2 is provided is not restricted to the said embodiment. For example, the second injection hole G2 is not a portion corresponding to the portion between the through holes 12a of the upper edge portion 12 of the corner girder and a portion corresponding to the thickness N1 of the outer wall 31 of the corner girder 30, but a corner. You may provide in the other part of the upper part edge 12 of a part beam. This also applies to the second injection hole G2 provided in a portion corresponding to the upper outer edge portion 13 of the intermediate beam. Moreover, you may provide in the part corresponded not only in the part corresponded to the corner part upper outer edge part 12 or the intermediate | middle beam upper outer edge part 13, but in the insertion hole upper outer edge part 15. FIG. That is, any portion corresponding to the outer edge portion 11 of the mounting deck 10a may be provided.

  Furthermore, the position where the second injection hole G2 is provided is not limited to the outer edge portion 11 of the mounting deck 10a. For example, you may provide in the part corresponded to the outer wall 31 of the corner girder 30, and the outer wall 41 of the intermediate girder 40. FIG. Also in this case, since the second resin material is quickly filled in the portions corresponding to the outer wall 31 of the corner beam 30 and the outer wall 41 of the intermediate beam 40, these outer walls are reliably constituted by the second resin material. Can be made.

  In addition to the outer edge portion 11 of the mounting deck 10a and the outer wall of each girder, the second injection hole G2 may be provided in other portions. For example, the second injection hole G <b> 2 may be provided in portions corresponding to the corner beam inner beam 22 and the intermediate beam inner beam 24. In this case, almost all the corner beam inner beam 22 and the intermediate beam beam 24 are made of the second resin material. For example, when the pallet is viewed from above, the corner beam 30 and the intermediate beam 40 are displayed. The position of the fork insertion hole F is easily grasped accordingly.

  In the above-described embodiment, the outer edge portion 11 extends from the outer edge of the mounting deck 10a to the outermost outer edge rail of the mounting deck 10a. However, the range of the outer edge portion 11 is not limited thereto. For example, in FIG. 4, the outer edge portion 11 may be a portion extending in parallel with the upper edge portion 12 of the corner beam of the inner beam 22 of the corner beam. Similarly, in FIG. 5, out of the intermediate girder inner beam 24, the outer edge portion 11 may extend to a hypotenuse extending so as to be parallel to the upper girder upper outer edge portion 13. In this case, for example, by increasing the thickness of the ribs 23 in the corner girders and the ribs 25 in the middle girders, or by not providing the gap K1 or the gap K2, the second resin material can be used for each girder. It becomes easy to reach a portion corresponding to the outer side wall.

  -The number of the 2nd injection hole G2 is not restricted to the said embodiment. In the above embodiment, the outer walls 31 of all the corner girders 30 and the outer walls 41 of the intermediate girders 40 are made of the second resin material. However, only some of the outer walls are made of the second resin material. Also good. For example, only the outer wall 31 of the corner girder 30 may be made of the second resin material, and conversely, only the outer wall 41 of the intermediate girder 40 may be made of the second resin material. . In addition, in each of the outer walls 31 and 41, all the parts may not be made of the second resin material, and may be partially made of the second resin material.

  The position where the first injection hole G1 is provided is not limited to the above-described embodiment, and may be any location as long as it corresponds to the placement portion 21 of the placement deck 10a, and the number thereof can be changed as appropriate. In addition to the portion corresponding to the mounting portion 21, the first injection hole G <b> 1 may be provided in a portion corresponding to the outer edge portion 15 of the insertion hole in the outer edge portion 11 of the mounting deck 10 a. In this case, it is suppressed that the second resin material injected from the second injection hole G2 is excessively filled in a portion corresponding to the upper edge 15 of the insertion hole.

  -It is preferable to make the space | interval of 2nd injection holes G2 narrower than the space | interval of 1st injection holes G1. If the second resin material is injected from the second injection hole G2 after injecting the first resin material from the first injection hole G1, the first resin material becomes an obstacle, and the portion corresponding to the mounting deck 10a has an excessively wide range. 2 Plays the role of preventing the resin material from flowing. Therefore, the amount of the second resin material injected into the portion corresponding to the mounting deck 10a can be reduced, which can contribute to cost reduction of the pallet.

As described above, the position and number of the first injection hole G1 and the second injection hole G2 can be appropriately changed in consideration of the shape of the pallet, the injection pressure (injection pressure) of each resin material, the injection amount, and the like. .
The relationship between the thickness N1 of the outer wall 31 of the corner girder 30 and the thickness N2 of the outer edge portion 11 (corner girder upper outer edge portion 12) is not limited to that of the above embodiment, and the thickness N1 and the thickness N2 And the wall thickness N2 may be larger than the wall thickness N1. The same applies to the relationship between the wall thickness N1 of the outer wall 41 of the intermediate beam 40 and the wall thickness N2 of the outer edge portion 11 (upper edge portion 13 of the intermediate beam).

  In the above embodiment, the outer wall 31 and the inner wall 32 of the corner girder 30 have substantially the same thickness N1, but this may be changed. For example, the wall thickness of the inner wall 32 may be thicker or thinner than the wall thickness of the outer wall 31. In particular, when the thickness of the inner wall 32 is made thinner than the thickness of the outer wall 31, the second resin material hardly reaches the portion corresponding to the inner wall 32, and an excessively wide area of the inner wall 32 is the second resin material. It is suppressed that it is comprised by. The same applies to the relationship between the thickness of the outer wall 41 of the intermediate beam 40 and the thickness of the inner wall 42.

  -The shape and dimension of the through-hole 12a and the through-hole 13a are not restricted to the thing of the said embodiment. For example, the through-hole 12a and the through-hole 13a may be formed in a circle or an ellipse, or may be formed in a polygonal shape other than a quadrangle. Further, the length in the longitudinal direction and the length in the lateral direction of the through-hole 12a and the through-hole 13a can be freely set in consideration of the shape of the pallet (outer edge portion 11), the viscosity and strength of each resin material, and the like. it can. Moreover, in the said embodiment, although a pair of through-hole 12a, 13a was provided, you may provide only one through-hole 12a for every digit outer edge part, or may provide three or more. Further, the through hole 12a may not be provided.

  The connection position of the corner girder inner rib 23 to the corner girder upper outer edge portion 12 is not limited to the corner portion of the outer edge portion 11, for example, in the portion between the pair of through holes 12 a in the corner girder upper outer edge portion 12. The corner girder inner rib 23 may be connected. Further, the number of corner girder ribs 23 is not limited to one, and two or more corner girder ribs may be provided. In any case, if there is a gap K1 between the upper edge 12 of the corner beam and the inner beam 22 of the corner beam, the second resin material reaches a portion corresponding to the inner beam 22 of the corner beam. It is suppressed. The same applies to the relationship between the intermediate girder inner rail 24 and the intermediate girder upper outer edge portion 13, and the connection position of the intermediate girder inner rib 25 to the intermediate girder upper outer edge portion 13 may be changed, or the intermediate girder inner rib One or three or more 25 may be provided.

  -The shape of the corner beam 30 and the intermediate beam 40 may be changed. Each of these girders is only required to be formed in a substantially rectangular tube shape as a whole. For example, a part or all of the outer wall and the inner wall may be formed in a curved shape.

  -The configuration of the deck 10 can be changed as appropriate. For example, in the above embodiment, the lower deck 10b may be formed in the same shape as the mounting deck 10a. Further, for example, as shown in FIG. 7, a mounting deck 80 is configured by a square plate-like plate-like body 81 and a plurality of ribs 82 suspended from the lower surface of the plate-like body 81. The upper surface may be formed in a planar shape. In this case, for example, a first rib 82a provided so as to extend in a quadrangular shape along the outer edge of the square plate-like body, and a second rib 82b provided so as to extend in the same rectangular shape inside the rib. The space (including the first rib 82 a and the second rib 82 b) corresponds to the outer edge portion 83 of the mounting deck 80. Furthermore, for example, the upper surface of the upper mounting deck may be formed in a flat shape (the mounting deck 80), and the lower mounting deck may be formed of a crosspiece, a rib, or the like (the mounting deck 10a). .

  In the mounting deck 80 in which the upper surface described above is formed in a planar shape, the second injection hole G2 may be provided in a portion corresponding to the first rib 82a as shown in FIG. The first rib 82 a constitutes the outer edge portion 83 of the mounting deck 80 and is located above the fork insertion hole F, and therefore corresponds to the outer edge portion 15 of the outer edge portion 83.

  In the above embodiment, a pair of fork insertion holes F is formed on each side surface of the pallet, but a pair of fork insertion holes F need not be formed on all four side surfaces of the pallet. For example, the present invention may be applied to a so-called two-way insertion type pallet in which a pair of fork insertion holes F is formed on one side surface of the pallet and a pair of fork insertion holes F are formed on the side surface facing the one side surface. . An example of the two-way pallet is the pallet disclosed in Patent Document 1.

  -You may make it manufacture the pallet of the said embodiment by welding two halves. Specifically, for example, two halves that are cut at the center of each corner girder 30 and intermediate girder 40 in the vertical direction of the pallet are prepared, and each corner girder 30 in these two halves is prepared. The intermediate pallet 40 may be joined to form a pallet. Furthermore, in this case, the upper half and the lower half do not have to have the same shape.

  In addition, when manufacturing a pallet by welding two halves, compared with the case where a pallet is manufactured integrally as in the above embodiment, the outer wall 31 of the corner beam 30 and the outer wall of the intermediate beam 40 are used. The height of 41 is halved. Accordingly, the distance from the second injection hole G2 provided in the portion corresponding to the upper mounting deck 10a to the lower end of the outer wall 31 of the corner girder 30 and the lower end of the outer wall 41 of the intermediate girder 40 is shortened. Therefore, the second resin material can be quickly distributed to the portions corresponding to the respective outer walls.

  -The timing of the start of injection of the second resin material is not limited to that of the above embodiment. For example, the second resin material may be injected after the first resin material is completely cured, or the second resin material is injected at the same time as or before the start of the injection of the first resin material. You may make it do.

  The first resin material and the second resin material are not limited to those in the above embodiment, and any resin material that can be used in the injection molding method may be used. However, the color of the first resin material and the color of the second resin material need to be different.

Next, the technical idea that can be grasped from the embodiment and the modified examples will be additionally described below.
(A) A pallet in which an injection trace is formed in a portion where the first resin material is injected and a portion where the second resin material is injected.

(B) A pallet characterized in that a gap is provided between the girder outer edge and the mounting portion.
(C) The pallet characterized in that the outer edge portion of the beam arranged with the gap portion interposed therebetween and the mounting portion are connected only by the ribs in the beam.

  (D) a mounting deck having a quadrangular shape in plan view and a plurality of rectangular cylindrical cylindrical girders connected to the lower side of the mounting deck, and a fork insertion hole between the adjacent cylindrical girders The pallet is formed by a rectangular frame-shaped outer edge portion formed on the outer edge of the mounting deck and a mounting portion surrounded by the outer edge portion, and the cylinder A mold clamping step in which a shape girder includes an outer wall facing outward of the pallet and an inner wall facing inward of the pallet, and a cavity corresponding to the shape of the pallet is formed by a mold; A first resin material injection step of injecting a first resin material into a placement portion corresponding to the placement portion in the cavity, an outer wall equivalent portion corresponding to the outer wall in the cavity, and the cavity Said From at least one of the outer edge portion corresponding portion corresponding to the edge portion, the manufacturing method of the pallet, characterized in that it comprises a second resin material injection step of injecting a second resin material of a color different from the first resin material.

  (E) The second resin in the second resin material injection step after the injection of the first resin material is started in the first resin material injection step and before the injection of the first resin material is completed. A method for manufacturing a pallet, characterized by starting injection of a material.

DESCRIPTION OF SYMBOLS 10 ... Mounting deck, 11 ... Outer edge part, 12 ... Outer edge part on corner girder, 12a ... Through hole, 13 ... Outer edge part on middle girder, 13a ... Through hole, 15 ... Outer edge part on insertion hole, 21 ... Mounting , 22 ... corner girder beam, 23 ... corner girder rib, 24 ... intermediate girder beam, 25 ... intermediate girder rib, 27 ... center girder beam, 28 ... girder beam, 29 ... connecting beam, 30 ... Corner girder, 31 ... Outer wall, 31a ... Chamfered part, 32 ... Inner wall, 40 ... Middle girder, 41 ... Outer wall, 41a ... Chamfered part, 42 ... Inner wall, 50 ... Center girder, C ... Amami T, F ... fork insertion hole, G1 ... first injection hole, G2 ... second injection hole, T1 ... first injection trace, T2 ... second injection trace, K1, K2 ... gap.

Claims (4)

A loading deck formed by injecting a first resin material and a second resin material having different colors into the same cavity and having a square shape in plan view, and a lower side of the loading deck A pallet in which a fork insertion hole is formed between the adjacent cylindrical girders.
The mounting deck includes a square frame-shaped outer edge formed on an outer edge of the mounting deck and a mounting portion surrounded by the outer edge, and the cylindrical girder is formed on an outer wall facing inward and inward. An inner wall facing,
A pallet comprising a first resin material injected from the placement portion and the second resin material injected from at least one of the outer wall and the outer edge.   The outer wall is made of the second resin material, and a part of the inner wall is made of the second resin material. The pallet according to claim 1, wherein a portion constituted by is large. The outer edge portion includes a girder outer edge portion located above the outer wall and an insertion hole upper outer edge portion located above the fork insertion hole,
3. The pallet according to claim 1, wherein the second resin material is injected from a center of an upper surface of the girder outer edge portion. The outer edge portion includes a girder outer edge portion located above the outer wall and an insertion hole upper outer edge portion located above the fork insertion hole,
A plurality of through holes are formed in the girder outer edge, and the second resin material is injected from the girder outer edge between the plurality of through holes. The pallet as described in any one of Claims 1-3.

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