JP6429233B2 - Wall structure of transfer container - Google Patents

Description

  The present invention relates to a wall structure of a transport container in which a wall of any one of an upper surface, a side surface, and a lower surface of the transport container is molded in two colors with a first resin and a second resin.

  Conventionally, as a wall structure of this type of transport container, for example, a window portion is provided on an upper surface lid as an upper surface wall of the transport container, and a lid frame portion surrounding the window portion is formed of a first resin, while being stretched on the window portion. The thing which comprised the transparent board made from 2nd resin is known (for example, refer patent document 1).

JP 2011-219108 A (FIGS. 1 and 2, paragraphs [0025] and [0026])

  By the way, in the structure of the above-mentioned conventional upper surface lid, during the molding of the first resin wall portion (lid frame portion) of the two-color molding die, the molding surfaces for the second resin molding are in contact with each other. The second resin is filled by filling the second resin in the cavity where the molding surface appears apart after the molding of the first resin wall. However, in the conventional wall structure of the transport container described above, scratches and dents due to the contact between the molding surfaces of the two-color molding dies are reflected on the second resin wall part, and the molding quality may deteriorate. .

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a wall structure of a transport container having higher molding quality than conventional ones.

In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that the upper surface, the side surface, or the lower surface of the transport container is molded in two colors with the first resin and the second resin, and is molded first. In addition, a transport container having a belt-like fixing surface in which a part of the first resin wall part made of the first resin and a part of the second resin wall part made of the second resin which are molded later are overlapped and fixed . In the wall structure, a plurality of fine protrusions or fine portions are formed on at least one surface of the second resin wall portion that does not overlap with the first resin wall portion along the edge on the belt-like fixing surface side. It is the wall structure of the conveyance container provided with the strip | belt-shaped edge part formed by shape | molding a recessed part.

  The invention according to claim 2 is the wall structure of the transport container according to claim 1, wherein a portion other than the edge portion on the belt-like fixing surface side of the second resin wall portion is thicker than the edge portion.

  According to a third aspect of the present invention, on one surface of the front and back surfaces of the second resin wall portion, a hill portion is formed by projecting the entire portion excluding the edge portion on the belt-like fixing surface side in a stepped shape, It is a wall structure of the conveyance container of Claim 2 by which the said strip | belt-shaped edge part is shape | molded by the one surface where the said hilly part was shape | molded among the front and back of the resin wall part.

  According to a fourth aspect of the present invention, a depressed portion is formed in a stepped shape along an edge of the first resin wall portion, and the hill portion of the second resin wall portion is formed on a bottom surface of the depressed portion. While one side of the molded surface is fixed, a part of the edge of the second resin wall part is left as the belt-like region between the hill part and the first resin wall part, It is a wall structure of the conveyance container of Claim 3 with which the said strip | belt-shaped edging part is shape | molded.

The wall structure of the transport container according to claim 1 has a belt-like fixing surface on which a part of the first resin wall part and a part of the second resin wall part made of the second resin formed later overlap and adhere. . Then, a plurality of fine protrusions or fine recesses are formed along the edge on the band-shaped fixing surface side on at least one surface of the front and back of the portion not overlapping the first resin wall portion of the second resin wall portion. strip edging section made, since is provided, scratches and dents inconspicuous be shaped in the strip bordering portion. As a result, when the first resin wall portion is molded with the two-color molding die, only the edge portion near the molding surface for the first resin wall portion is brought into contact with the molding surface for the second resin wall portion. After forming the first resin wall portion in a state, the edges of the molding surface for the second resin wall portion are separated from each other, and the second resin wall portion is molded, so that the molding surfaces of Even if the scratches or dents caused by the contact are attached to the edge of the molding surface for the second resin wall, it can be made inconspicuous by the fine recesses for forming the belt-like edge portion provided at the edge. In other words, even if scratches or dents on the molding surface of the two-color molding die are reflected on the wall of the transport container, it can be made inconspicuous by the strip-shaped border, and the molding quality of the wall structure of the transport container is made higher than before. It becomes possible.

  Here, when the first resin wall portion is molded, in order to make only the edge near the molding surface for the first resin wall portion out of the molding surface for the second resin wall portion, the second resin When the wall thickness of the wall portion is uniform, it is necessary to have a structure in which the edge portion and the other portion of the molding surface for the second resin wall portion of the two-color molding die are moved separately. On the other hand, as in the wall structure of the transport container according to claim 2, if the portion other than the edge portion on the belt-like fixing surface side of the second resin wall portion is thicker than the edge portion, the second resin wall portion is used. It is not necessary to divide the molding surface into two parts and move it separately. Only the edge of the molding surface for the second resin wall can be brought into contact with each other, thereby reducing the production cost of the two-color molding die. be able to.

  According to the wall structure of the transport container according to claim 3, since the molding surface for the strip-shaped edging portion is disposed on the upper surface of the protrusion adjacent to the concave portion for forming the hill portion in the two-color molding die, The molding surface for the edging portion can be easily formed, and the mold production cost can be reduced.

  According to the wall structure of the transport container according to claim 4, the molding surface for the belt-like border is sandwiched between the concave portion for forming the hill portion and the concave portion for forming the first resin wall portion of the two-color molding die. Since it is arranged on the upper surface of the part, the formation of the molding surface for the belt-like edge part becomes easier, and the mold production cost can be reduced.

  In addition, in invention of Claim 3, 4, the strip | belt shape edge part may be shape | molded on both surfaces of the front and back of the 2nd resin wall part, and is shape | molded only on the one surface where the hilly part was shape | molded. Also good. And if a belt-like border part is made into the wall structure shape | molded only in the one surface by which the hilly part was shape | molded among the front and back of the 2nd resin wall part, a belt-like border part will be shape | molded on both surfaces of the front and back of the 2nd resin wall part Compared with the wall structure thus formed, it is easy to form a molding surface for the band-shaped border in the two-color molding die.

The perspective view of the conveyance container which concerns on 1st Embodiment of this invention. The perspective view which looked at the lid of the transport container from the lower surface side The perspective view which expanded a part of lid Sectional view enlarging a part of the lid Cross section of two-color mold Sectional view of a two-color mold with the slide core in the initial position Sectional view of a two-color mold with a slide core in the core back position Cross section of the lid in the two-color mold The perspective view of the conveyance container which concerns on 2nd Embodiment Sectional view of a two-color mold with a slide core in the core back position Sectional drawing which expanded a part of lid concerning a 3rd embodiment Sectional view of a two-color mold with the slide core in the initial position Sectional view of a two-color mold with a slide core in the core back position Sectional drawing which expanded a part of lid concerning a 4th embodiment Sectional view of a two-color mold with a slide core in the core back position The perspective view of the conveyance container which concerns on the modification of this invention The perspective view which expanded a part of the conveyance container

[First Embodiment]
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. The upper surface wall of the transport container 99 shown in FIG. 1 is a lid 90, and the “wall structure of the transport container” according to the present invention is applied to the lid 90. The lid body 90 includes, for example, a rectangular window portion 94 having a quadrangular planar shape. The lid frame portion 91 surrounding the window portion 94 of the lid body 90 corresponds to the “first resin wall portion” of the present invention, and is made of, for example, an opaque first resin (for example, block PP), The window plate portion 81 stretched on the window portion 94 corresponds to the “second resin wall portion” of the present invention, and is made of, for example, a transparent second resin (for example, random PP). Then, the lid body 90 is manufactured by two-color molding of the first resin and the second resin.

  Specifically, an outer edge reinforcing portion 91 </ b> A is formed on the entire outer edge portion of the lid frame portion 91. The outer edge reinforcing portion 91A bulges upward, while the lower surface side is recessed in a groove shape as shown in FIG. 2, and an in-groove reinforcing rib 91L is provided in the groove. As shown in FIG. 3, an annular inclined portion 91E is formed on the ceiling plate portion 91C inside the outer edge reinforcing portion 91A in the lid frame portion 91 at a position near the outer edge reinforcing portion 91A, and the annular inclined portion of the ceiling plate portion 91C is annular inclined. An inner portion of the portion 91E is depressed downward. Further, a fitting cylinder wall 91B is formed to project from the lower surface of the outer portion of the ceiling plate portion 91C than the annular inclined portion 91E, and the fitting cylinder wall 91B is inside the upper surface opening of the container main body 98 (see FIG. 1). It is designed to fit in.

  As shown in FIG. 4, the ceiling plate portion 91 </ b> C is bent downward in a crank shape at a position slightly outside the window portion 94, and the recessed portion 92 according to the present invention is provided on the upper surface of the ceiling plate portion 91 </ b> C. A lower stepped portion 72 is provided on the lower surface of the ceiling plate portion 91C. In addition, a reinforcing annular rib 73 hangs from the inner side of the lower stepped portion 72 in the lower surface of the ceiling plate portion 91C. The outer side surface 73A of the reinforcing annular rib 73 is disposed flush with the step surface 72D of the lower stepped portion 72, while the inner side surface 73B of the reinforcing annular rib 73 is flush with the stepped surface 92D of the recessed portion 92. Is arranged.

  The window plate portion 81 is fitted inside the recessed portion 92 of the lid frame portion 91 and is fixed to the step surface 92D and the bottom surface 92C of the recessed portion 92 to form the “band-shaped fixing surface” of the present invention. And the outer edge part of the window-plate part 81 is supported from the downward direction by the window-plate support part 93 which has the bottom face 92C.

  The upper surface of the window plate portion 81 is flat and is flush with the upper surface of the ceiling plate portion 91C. Further, from the lower edge portion of the wall thickness surface 81S fixed to the step surface 92D of the lid frame portion 91 in the window plate portion 81, the engagement protrusion 95 protrudes laterally and bites into the lower end portion of the step surface 92D. Yes.

  An annular belt-like region adjacent to the window plate support portion 93 of the lid frame portion 91 on the lower surface of the window plate portion 81 is formed with a plurality of fine protrusions as a whole to form a belt-like edge portion 83 according to the present invention. ing. Thereby, only the part in which the strip | belt-shaped edge part 83 was formed becomes translucent, and the part other than the strip | belt-shaped edge part 83 is transparent. Further, an inner portion of the lower surface of the window plate portion 81 from the strip-shaped edge portion 83 protrudes downward as a hill portion 82. The step surface 82D between the hill portion 82 and the strip-shaped edge portion 83 is inclined at an angle of approximately 45 degrees with respect to the belt-shaped edge portion 83.

  FIG. 5 shows an enlarged part of the two-color molding die 10 for manufacturing the lid 90. In the figure, reference numeral 11 is a fixed type, and reference numeral 31 is a movable type. The movable mold 31 linearly moves between a mold closing position (position shown in FIG. 5) joined to the fixed mold 11 and a mold opening position (not shown) separated from the fixed mold 11. Further, the movable mold 31 is formed with a core receiving hole 31A having a quadrangular section corresponding to the window plate portion 81 of the lid 90, and the slide core 32 is received in the core receiving hole 31A. When the movable mold 31 moves from the mold opening position to the mold closing position, the slide core 32 is disposed at the initial position shown in FIG. Thereafter, the slide core 32 moves to the core back position shown in FIG. 7 (that is, the core backs up) while the movable mold 31 is maintained in the mold closed position.

  Specifically, as shown in FIG. 6, the tip of the slide core 32 is a molding surface 33 for molding the upper surface of the window plate portion 81 and is entirely flat. On the other hand, a portion of the fixed mold 11 facing the molding surface 33 of the slide core 32 is an annular recess 35A for molding the window plate support portion 93 of the lid frame portion 91 on the entire outer edge. The inside is a molding surface 34 for molding the lower surface of the window plate portion 81. The molding surface 34 for the window plate portion 81 of the fixed mold 11 is a central concave portion 34A that is recessed shallower than the annular concave portion 35A, except for the outer edge adjacent to the annular concave portion 35A. An annular bank portion 34B that is stepped and raised is provided between 35A and 35A. And the hilly part 82 of the window-plate part 81 is shape | molded by the center recessed part 34A, and the strip | belt-shaped edge part 83 (refer FIG. 3) of the window-plate part 81 by the end surface (namely, opposing surface to the slide core 32) of the annular bank part 34B. Is formed.

  In order to mold a plurality of fine protrusions of the belt-like edge portion 83, the end surface of the annular bank portion 34B is an embossed embossed surface 34C. Specifically, the embossing surface 34C is formed by, for example, rolling a not-illustrated embossing roller against the end surface of the annular bank portion 34B and marking a plurality of fine recesses. Further, when the annular bank portion 34B and the slide core 32 are in contact with each other as described below, the molten resin for forming the lid frame portion 91 is prevented from entering between the contact surfaces. Moreover, the depth of the fine recesses on the embossing surface 34C is extremely small, or the fine recesses are separated from each other.

  With this two-color molding die 10, the lid 90 is manufactured as follows. That is, when the two-color molding die 10 is started, as shown in FIG. 6, the movable die 31 is arranged at the die closing position and the slide core 32 is arranged at the initial position. An annular first cavity 38 is formed therebetween. At this time, the fixed mold 11 for molding the window plate portion 81 and the molding surfaces 33 and 34 of the slide core 32 are in contact with each other at the inner portion surrounded by the first cavity 38, and the inner edge of the first cavity 38 is Blocked. Then, the melted first resin is filled into the first cavity 38 from the first resin injection port 12A (see FIG. 5) of the fixed mold 11 and solidifies for a while to form the lid frame portion 91.

  Next, as shown in FIG. 7, the slide core 32 moves to the core back position, and a second cavity 39 is formed between the slide core 32 and the fixed mold 11. Then, the second cavity 39 is filled with the molten second resin from the second resin injection port 12B (see FIG. 5) of the fixed mold 11 and solidifies for a while. As shown in FIG. It is formed.

  In the present embodiment, the solidification of the inner corner portion of the depressed portion 92 where the most resin is gathered in the lid frame portion 91 is the slowest, and the slide core is in a state where the inner corner portion of the depressed portion 92 is not completely solidified. 32 is core-backed, and the second resin 39 in a molten state is filled in the second cavity 39. As a result, a part of the second resin enters the inner corner portion of the recessed portion 92 and the engaging protrusion 95 is formed.

  By the way, when the lid frame portion 91 is molded in the first cavity 38, the molding surfaces 33 and 34 for the window plate 81 of the fixed mold 11 and the slide core 32 are in contact with each other as described above (see FIG. 6), the molding surfaces 33 and 34 are not in contact with each other, but only the annular bank portion 34B located at the outer edge portion and the opposite portion thereof are in contact. Therefore, even if the two-color molding die 10 is continuously used, the molding surfaces 33 and 34 for the window plate portion 81 have scratches and dents due to the contact between the molding surfaces 33 and 34 on portions other than the outer edge portion. Not attached. Thereby, parts other than the outer edge part of the window-plate part 81 can be shape | molded in a high quality surface with few or few dents.

  On the other hand, the annular bank 34B located at the outer edge of the molding surfaces 33 and 34 for the window plate portion 81 and the opposing portion thereof may be damaged or dents due to the contact between the molding surfaces 33 and 34. However, since the entire end surface of the annular bank portion 34B is a textured molding surface 34C having a plurality of fine recesses, even if there are scratches or dents, it is not noticeable. That is, even if the scratches or dents caused by the contact between the molding surfaces 33 and 34 are molded on the lower surface of the window plate portion 81, they are buried in the plurality of fine protrusions of the strip-shaped edge portion 83 molded by the embossing molding surface 34C. It can be made inconspicuous. Further, even if scratches or dents are formed on the back surface of the strip-shaped edge portion 83 on the upper surface of the window plate portion 81, it is buried in a plurality of fine protrusions of the strip-shaped edge portion 83 that can be seen through the window plate portion 81. It can be made inconspicuous.

  As described above, according to the wall structure of the transport container 99 of the present embodiment, the second resin wall portion (window plate portion 81) to be molded later of the lid body 90 that is two-color molded with the first resin and the second resin. ), It is possible to make the molding quality higher than the conventional one by making the flaws and the like due to the molding which are conventionally conspicuous by the strip-shaped border 83. Further, according to the wall structure of the transport container 99, the end surface of the annular bank portion 34B having the embossed molding surface 34C for molding the belt-like edge portion 83 of the two-color molding die 10 is formed in an annular shape with the central recess 34A. Since it protrudes sandwiched between the recesses 35A, the embossed molding surface 34C can be easily formed only on the end surface of the annular bank portion 34B, and the production cost of the two-color molding die 10 can be reduced. .

[Second Embodiment]
As shown in FIG. 9, the lid body 90 </ b> V of the present embodiment has a belt-like edge portion 83 </ b> V similar to the belt-like edge portion 83 (see FIG. 2) on the lower surface formed on the outer edge portion of the upper surface of the window plate portion 81. Only differs from the first embodiment. Further, as shown in FIG. 10, the two-color molding die 10V for molding the lid 90V includes an embossed surface 34C on a portion of the slide core 32 that contacts the embossed surface 34C of the fixed die 11. A textured surface 34E similar to the above is formed. According to the configuration of this embodiment, scratches or the like due to molding of the upper surface of the window plate portion 81 can be made inconspicuous by the strip-shaped edge portion 83V.

[Third Embodiment]
As shown in FIG. 11, the window plate portion 81 </ b> W of the lid body 90 </ b> W of the present embodiment excludes the hill portion 82 (see FIG. 4) from the window plate portion 81 of the lid body 90 of the first embodiment. The structure is flat on both sides. In addition, a belt-like edge portion 83 is formed on the outer edge portion of the lower surface of the window plate portion 81W in the same manner as the window plate portion 81 of the first embodiment.

  FIG. 12 shows a two-color molding die 10W for manufacturing the lid body 90W of the present embodiment. The fixed die 11W of the two-color molding die 10W does not have a portion corresponding to the central recess 34A of the two-color molding die 10 of the first embodiment, and the molding surface 34 for the window plate portion 81W is flat. ing. In addition, a textured molding surface 34C is formed on the outer edge portion of the molding die 34 for the window plate portion 81W in the fixed die 11W, as in the two-color molding die 10 of the first embodiment.

  On the other hand, in the movable mold 31W, an annular core receiving hole 31B is formed in a portion corresponding to the outer edge portion of the window plate portion 81W, and the cylindrical slide core 40 is received therein so as to be linearly movable. When the movable mold 31W is moved to the mold closing position, the outer edge portion of the end surface of the slide core 40 faces the annular recess 35A, and the portions other than the outer edge portion are in contact with the embossing surface 34C of the fixed mold 11W. At this time, the molding surface 33A of the inner portion of the slide core 40 in the movable die 31W is held in a state of being separated from the molding surface 34 for the window plate portion 81W in the fixed die 11W, and between the molding surfaces 33A, 34. A second cavity 39 is formed. That is, when the movable mold 31W is moved to the mold closing position, the first cavity 38 and the second cavity 39 are partitioned by the slide core 40. In this state, the first cavity 38 is filled with the first resin to form the lid frame portion 91, and then the slide core 40 moves to the core back position as shown in FIG. The molding surface 33A of the inner portion of 40 and the molding surface 33B of the slide core 40 are flush with each other. Then, the second cavity 39 is filled with the second resin to mold the window plate portion 81W.

  The configuration of the present embodiment also provides the same operational effects as the first embodiment. However, the structure of the lid 90 of the first embodiment simplifies the mold structure, and the mold manufacturing cost can be reduced.

[Fourth Embodiment]
The lid 90X of the present embodiment has a structure in which the reinforcing annular rib 73 and the window plate support 93 are excluded from the lid 90 of the first embodiment as shown in FIG. The entire circumference of the hill part 82 is a belt-like border part 83. In addition, as shown in FIG. 15, the two-color molding die 10X for manufacturing the lid 90X includes a reinforcing annular rib 73 and a window plate from the fixed die 11X of the two-color molding die 10 of the first embodiment. A portion where the support portion 93 (see FIG. 6) is formed is eliminated, and a textured molding surface 34C is provided on the outer edge portion of the molding surface 34 for the window plate 81 in the fixed mold 11X. Also according to the present embodiment, the same effects as those of the first embodiment can be obtained.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

  (1) In the first to fourth embodiments, the example in which the present invention is applied to the lid 90 that is the upper surface wall of the transport container 99 has been shown. However, the present invention is applied to the side wall and the lower surface wall of the transport container 99. You may apply. Specifically, for example, like a foldable transport container 97 shown in FIGS. 16 and 17, the first resin wall 96 </ b> A made of a first resin whose upper surface and four side surfaces are opaque are transparent. In the structure constituted by the second resin wall portion 96B made of the second resin, the present invention is applied and at least one surface of the front and back surfaces of each second resin wall portion 96B has a plurality of fine protrusions or fine recesses. You may border by the strip | belt-shaped border part 96C.

  (2) In the first to fourth embodiments, the first resin wall portion (lid frame portion 91) is opaque, while the second resin wall portions (window plate portions 81, 81W) are transparent. The first resin wall portion and the second resin wall portion may be either colorless and transparent or colored and transparent, may be translucent, may be opaque, and may be combined in any way .

  (3) In the first to fourth embodiments, the first resin wall portion (lid frame portion 91) has a frame structure, and the second resin wall portions (window plate portions 81, 81W) are arranged inside thereof. However, for example, the present invention may be applied to a case where the upper, lower, or side walls of the transport container are divided into a first resin wall portion and a second resin wall portion in the vertical direction or the horizontal direction.

81, 81W Window plate (second resin wall)
82 Hills 83, 83V, 96C Banded edges 90, 90V, 90W, 90X Lid 91 Lid frame (first resin wall)
92C Step bottom surface 92D Step surface 92 Depressed portion 94 Window portion 96A First resin wall portion 96B Second resin wall portion 97,99 Transport container

Claims (4)

The wall of any one of the upper surface, the side surface, and the lower surface of the transport container is molded in two colors with the first resin and the second resin, and a part of the first resin wall portion made of the first resin previously molded In the wall structure of the transport container having a belt-like fixing surface that is fixedly overlapped with a part of the second resin wall portion made of the second resin formed later,
A plurality of fine protrusions or fine recesses are formed along at least one of the front and back surfaces of a portion of the second resin wall portion that does not overlap the first resin wall portion along the edge on the belt-like fixing surface side. A wall structure of a transport container provided with a belt-like border.   The wall structure of the transport container according to claim 1, wherein a portion of the second resin wall portion other than the edge portion on the band-shaped fixing surface side is thicker than the edge portion. On one side of the front and back of the second resin wall portion, a hill portion is formed by projecting the entire portion excluding the edge portion on the belt-like fixing surface side in a stepped shape,
The wall structure of the transport container according to claim 2, wherein the belt-like edge portion is formed on one surface of the front and back surfaces of the second resin wall portion on which the hill portion is formed.   A stepped recess is formed along the edge of the first resin wall, and one surface of the second resin wall formed with the hill is formed on the bottom of the recess. In addition to being fixed, a part of the edge of the second resin wall part is left as the band-like region between the hill part and the first resin wall part, and the band-like edge part is formed in the band-like region. The wall structure of the transport container according to claim 3.

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