JP2014043270A - Hollow tray - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a carrying tray which is hardly deformed or damaged by absorbing vibrations or the like of an article at the time of carrying even if carrying trays are accumulated, and is reusable, productable, and practical because of low cost.SOLUTION: A hollow tray is formed by a blow molding method. The hollow tray has a top face and a bottom face which are opposite through a hollow part. In the hollow tray, the top face and the bottom face respectively have recessed parts for housing an article and dents for reinforcement arranged around the recessed parts, the bottoms of the recessed parts of the top face are separated from the bottoms of the recessed parts of the bottom face, and the bottoms of the dents for reinforcement of the top face are brought into contact with the bottoms of the dents for reinforcement of the bottom face.

Description

The present invention relates to a tray used for storing or transporting articles.
This tray is used by using a plurality of trays and sandwiching articles from above and below. Further, the articles and trays are alternately stacked to be used in multiple stages.

Conventionally, as a tray for transporting a large article such as a wheel used for a tire, a flat plate-shaped transport tray made of a synthetic resin sheet, a nonwoven fabric, a sponge sheet, or a synthetic resin sheet to which a sponge is attached is known. Yes.
Also, a method of covering the periphery with a molded foamed polyethylene cushioning material is known. For example, after placing an article in a box while covered with a polyethylene bag, injecting urethane foam resin to foam the cushioning material The method of packing at the same time as molding was taken.
However, when a transport tray made of a synthetic resin sheet is used for transporting an article having a delicate surface (such as an aluminum or painted tire wheel), there is a problem that the surface of the article is easily damaged. In addition, a flat plate-shaped transport tray made of a nonwoven fabric, a sponge sheet, or a synthetic resin sheet to which a sponge is attached has a problem that it cannot be used as a transport tray again because it is cumbersome and cannot maintain a stable packing state. .
Furthermore, in the case of foamed polyethylene cushioning material and foamed urethane resin, it is very expensive, and when it is broken by unpacking, it is difficult to reuse, and it is necessary to dispose of the packaging material and waste resources. There was a problem.

With respect to the above problems, in Document 1, a transport tray obtained by vacuum-forming a laminate of a hard sheet and a soft sheet made of synthetic resin, the top portion is at the same height as the upper substrate, and is inclined from the top portion toward the lower substrate. There has been proposed a transport tray in which a crest having an inclined surface is formed along the long side of the transport tray, and a recess is formed around the crest and in a portion surrounded by the crest.
However, when this transport tray is transported in a state where it is stacked in multiple stages, the shock is not enough to prevent scratches and deformations on the goods packed on the lower side. It was necessary to adopt a method of placing the above on the transfer tray. In addition, the packaging is complicated, the used cushioning material is discarded, and there is a problem that the waste of resources cannot be solved.

Japanese Patent No. 35589748

  In view of the above problems, even when stacked in multiple stages, it is a transport tray that absorbs vibrations of articles during transport and is not easily deformed or scratched. Proposing a typical transport tray is the subject of the present invention.

The tray according to claim 1 of the present invention is a hollow tray formed by a blow molding method, and the hollow tray has an upper surface and a lower surface facing each other through a hollow portion,
The upper surface and the lower surface each have a recess for storing an article and a reinforcing recess disposed around the recess,
The bottom of the recess on the top surface and the bottom of the recess on the bottom surface are spaced apart,
The bottom of the reinforcing recess on the upper surface is in contact with the bottom of the reinforcing recess on the lower surface.

  In the tray according to claim 2 of the present invention, the upper surface and the lower surface each have a supporting recess arranged around the recess, and the bottom of the supporting recess on the upper surface and the lower surface are used for supporting the lower surface. The hollow tray is characterized in that the bottom of the depression can come into contact when the article is placed in the recess on the upper surface.

  In the tray according to claim 3 of the present invention, the article is a tire wheel, the concave portion houses the tire wheel vertically, and a bottom surface of the concave portion is a convex portion in contact with a rim portion of the tire wheel. It is a hollow tray characterized by having.

  In the hollow tray of the present invention, the internal space formed by blow molding becomes a buffer space, and the article to be conveyed is hardly damaged. Moreover, since it can be produced by blow molding, the receiving surface and the lid surface of the article can be molded at the same time. In addition, there is a merit that it can be reused as many times as it can be damaged.

It is an external view of the hollow tray which lays down the article | item of this invention. It is an external view which shows the state packed in the multistage in the hollow tray which lays down the article | item of this invention. It is sectional drawing which shows the state packed in the multistage with the hollow tray which lays down the articles | goods of this invention. It is the enlarged view of the cross section which shows the state packed in the multistage with the hollow tray which lays down the article | item of this invention. It is an external view of the hollow tray which vertically arranges the article of the present invention. It is an external view which shows the state packed in the multistage with the hollow tray which vertically arrange | positions the articles | goods of this invention. It is sectional drawing which shows the state packed in the multistage with the hollow tray which vertically arrange | positions the articles | goods of this invention. It is the enlarged view of the cross section which shows the state packed in the multistage with the hollow tray which vertically arrange | positions the articles | goods of this invention. It is sectional drawing which looked at the state packed in the multistage by the hollow tray which puts the articles | goods of this invention vertically, from the right angle direction of FIG.

Hereinafter, embodiments of the hollow tray of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows an example of a hollow tray 2 in which an article 1 to be packed is a tire wheel and is placed horizontally. The hollow tray 2 is formed by blow molding using a parison having an oval cross section and a wide width.
The general manufacturing method of such a tray is as follows. That is, the resin is melted by a plasticizing screw of an injection molding machine, and the resin is stored in the screw tip or the injection metering unit. When the specified amount of molten resin is stored, the resin is extruded at once and the molten parison is extruded from a die having an elliptical slit. The parison is squeezed with front and rear blow molding dies, blow pins are driven into one end, and high-pressure air is blown into the parison for molding. Since the blow mold is cooled, the resin in contact with the mold is cooled and solidified, and the left and right and opposite pinch-off parts of the blow pin are fused, cooled, cut, and opened when the blow mold is opened. Are molded at once.
The blow mold can be made of an aluminum alloy that is easy to manufacture. However, it is preferable that the pinch-off portion that can be formed up and down in molding is made of a material having a high hardness and durability such as pre-hardened steel or alloy tool steel. The mold pinch-off part can be equipped with an automatic cutting function, but if the quantity is small or if you want to reduce the cost of the mold, we will handle it by post-processing.
Since it is formed by blow molding, an air layer is formed between the upper surface 3 and the lower surface 4. The receiving surface with which the end portion of the article 1 is in contact is a recess 5, and in order to isolate the articles 1 from each other for a certain period of time, it is necessary to provide an appropriate interval between the positions of the recesses into which the article 1 is fitted. Yes, the pitch of the recesses 5 as the receiving surface is set so that the articles are sufficiently separated.
FIG. 2 shows a stacked state. The article 1 is fixed in position and the side surface of the product is exposed. However, in the case of this tire wheel, there is no problem as long as there is no significant damage because it is a rim portion that is not an appearance surface.

FIG. 3 is a cross-sectional view in a horizontal position, and FIG. 4 is an enlarged view thereof.
It is preferable to load the easily damaged surface of the article 1 without contacting the tray and the article. When the article 1 is a tire wheel, only the rim flanges 11 and 12 are in contact with the tray when placed horizontally, and the rim flanges 11 and 12 receive a load when stacked.
In the upper receiving surface 51 and the lower receiving surface 52 of the recess 5 that become the receiving surface with which the article 1 comes into contact, the margin for moving the article 1 to the outside is reduced so that the article 1 can move only in a small range. . Therefore, the position of the trays does not become so large in the plane direction between the upper and lower sides.
Further, the height difference between the upper receiving surface 51 and the lower receiving surface 52 in the concave portion 5 of the tray and the surroundings is set to such an extent that it cannot be overcome even if it is slightly moved up and down due to vibration or the like in the stacking conveyance.
The upper standing wall 53 and the lower standing wall 54 forming the concave portion 5 are provided with a gradient so that the article 1 can easily enter the concave portion 5.
In the region for storing the article 1 inside the recess 5, the height is adjusted by making a relief so that the appearance part of the article does not come into contact even if the hollow tray 2 is slightly deformed. In FIG. 4, the upper relief 55 and the lower relief 56 are sufficiently separated from the article surface. The concave portion 5 for storing the article 1 does not need strength because the article is very light, and when the appearance portion and the tray are sufficiently separated from each other, the bottom surface may be flat. good. However, in order to protect articles from impacts and vibrations during transportation and loading / unloading, the tray is made stiff by providing a raised wall with uneven steps on the upper receiving surface 51 and the lower receiving surface 52 as much as possible. It is preferable to do so.

A gap 21 is usually provided so that the inner sides of the upper receiving surface 51 and the lower receiving surface 52 of the article 1 do not contact each other. This is because when the article 1 is placed on the upper tray or when it is transported, the recess 5 on the tray receiving surface is temporarily caused by impact or vibration applied to the article 1 sandwiched between the lower tray and the upper tray. Even if it is somewhat deformed, the inner side of the upper receiving surface 51 does not hit the inner side of the lower receiving surface 52, and plays a role of suppressing the deformation of the lower article 1.
The upper receiving surface 51 of the tray receives the load of the article 1. The load is transmitted to the tray lower surface 4 by the reinforcing recess 24 provided at the center of the hollow tray 2 and the reinforcing recess 25 provided at the side of the hollow tray 2, as well as the side of the tray. It will be received as a whole.
Since the standing walls are formed around the two reinforcing dents 24 and 25, the waist rises, the strength is increased, and the resistance to deformation also receives the load.
Further, the upper and lower reinforcing dents 24 and 25 are in contact with each other by the load of the article 1, and the upper load can be received by the lower surface 4 of the tray. Therefore, the durability is improved with an increase in the buffering capacity as a whole.
Of course, not all the reinforcing recesses need to be in contact with each other on the upper surface and the lower surface.

The difference between the upper receiving surface 51 and the lower receiving surface 52 of the article 1 or the difference between the upper surface 3 and the lower surface 4 of the tray should be clarified, or the same shape that can be used for either is used. good. If the difference between the articles 1 is large, the difference is clear and easy to understand. However, if it is difficult to clarify and the upper surface 3 and the lower surface 4 cannot be made the same shape, the upper and lower kanji characters are described in engraving. It is good as well.
As another method, at the time of blow molding, two injection machines can be used, and two flat resins can be extruded in parallel with different colored resins as a parison, and the front and back sides can be color-coded and molded. Of course, it is also possible to use two injection machines and mold using a parison extruded with a co-extrusion die of different colors in the circumferential direction.

The pinch-off 22 of the tray is used to melt and close a part of the unfused extruded portion of the cylindrical parison, and to make a wall there. In general, as shown in the cross section shown in FIG. 3, the molten resin of the parison is simply pressed together with a mold, and the molten parison is fused to cut the excess parison. However, when the fusing force is weak, a convex pinch-off 23 having a fusing width may be used as shown in the lower right diagram of the enlarged view of FIG. The fusion strength of the pinch-off is increased to increase the fusion strength. In that case, in order to strengthen the fusion of the pinch-off, if it is devised, for example, by providing irregularities from the outside of the fusion part, the fusion force is further increased.
In this case, the vicinity of the fusion part on the side surface may be recessed so that the pinch-off part does not fall into strength due to strong contact with other parts. In that case, when pulling out from the mold, attention should be paid to the slope of the recess so that the tray can be pulled out without resistance.

The tray of the present invention has a shape that requires a pinch-off portion on the side surface of the tray. That is, the size of the molded product is only slightly larger than the parison. In other words, because the blow ratio (product width) / (parison width) is too small to be molded, the tray is plate-shaped, and the blow ratio is very different from the vertical and horizontal. It depends on the point where the ratio cannot be applied.
In the blow molding of the tray, the pinch-off width is particularly large, due to the fact that the blow ratio cannot be increased, the size is large, and there are restrictions coming from the melt tension of the parison resin, the thickness of the parison, and the temperature of the parison. It has to be shaped. When the two flat resins are extruded in parallel, the entire periphery is pinched off.

For the vertical installation, the tray stacking state is as shown in FIG. When the article 1 is a tire wheel, the hollow tray is configured to contact only the rim portion 13 that does not become the outer appearance portion 14 of the wheel. That is, the bottom surface of the concave portion 5 includes two groove-shaped rim flange relief 57 and a convex portion 58 provided between the flange relief 57 so that pressure is not applied to the rim flanges 11 and 12 of the tire wheel. Have The convex portion 58 is in contact with the rim portion of the wheel and receives a load. That is, the convex part 58 becomes a receiving surface. The gap between the rim flange and the tray is escaped, and a gap 571 is provided to the end so that only the rim portion 13 having a strength receiving pressure or the like is applied with a full load.
In order to suppress deformation of the tray due to the load, a groove-shaped reinforcing recess 26 is provided. This not only suppresses deformation of the upper surface 3 but also has the same reinforcing recess 27 on the lower surface 4 so that the upper surface 3 and the lower surface 4 are in contact with the inner surface of the recess and receive a load here. Since the groove-shaped reinforcing recess 26 is provided with a standing wall in a straight line, the rigidity is very high, and the load of the article 1 can be received on both sides of the convex portion receiving the load of the article. Therefore, stable loading becomes possible.

Even in the vertical orientation, the main tray can be used to store in multiple stages as shown in FIG. In order to store in such a multi-stage, the convex portion 58 is set to have a width and an arc shape matching the rim shape as much as possible so that the rim portion 13 is equally loaded.
Here, if the radius of the arc of the tray is a little larger than the arc of the rim of the article 1, it will hit at one point or a line, so that the load cannot be reliably received and stable storage cannot be performed. Therefore, the convex portion 58 is set so as to be a contact surface having a slightly smaller radius than the rim arc.

FIG. 7 is a cross-sectional view schematically showing a cross section of the vertical tray, and FIG. 8 is an enlarged view thereof.
When the article 1 is a tire wheel, the tray is supported by the rim portion 13 in the vertical placement. The upper and lower trays 2 are in contact with and supported by the convex portion 58 in the concave portion 5 by about one-seventh to one-fourth of the circumference of the rim portion of the tire wheel. The larger this ratio is, the more stable it is to stack the tray 2 and the article 1, but when the article 1 is unloaded from the tray 2, the smaller one is easier.
FIG. 9 shows a cross-sectional view of the tire wheel as seen from the outer surface side.
Groove-shaped reinforcing recesses 26 and 27 are provided between rows of tire wheels that are articles 1. The upper and lower surfaces of the reinforcing recess 26 are in contact with each other, and the upper load is reliably received and supported by the lower surface. In this figure, there is a pinch-off portion 22 on the wall on the side of the tray. However, if the side is pinched off, the side wall is thicker and the strength for holding the article is more likely to be obtained. In the case where the parison is not an all-around pinch-off, it can be adjusted so as to be formed by excluding the side-side reinforcing recess 25 from the position sandwiching the parison as a pinch-off.

  Although not shown in the drawing, the tray may be provided with an insertion groove for a forklift claw so as to be lifted by the forklift. In this case as well, it is necessary to devise the reinforcing recesses 26 and 27 so as to obtain rigidity. The end of the reinforcing recess is opened to the outer surface on the side surface side, and the opened reinforcing recess is forklifted. It is also possible to use a nail insertion groove. In this way, it is possible to directly load and unload with a forklift like a pallet without requiring a pallet, which is very convenient.

As described above, the tray of the present invention is manufactured by producing a blow mold for manufacturing a tray having a shape matched with the article 1 to be packed.
As the tray material, ultra high molecular weight polyethylene, ultra high molecular weight polyethylene / polypropylene copolymer resin, or the like is used. This is because the melt tension of the melt parison extruded during blow molding has a high melt tension, the pinch-off part has a high fusion property, the molded article has a high rigidity, and the impact strength such as the drop strength is also high.
In order to prevent the product from being easily damaged by foreign matter such as dust, an antistatic agent can be added to the molding resin to prevent the foreign matter from adhering. In order to improve the weather resistance, it is preferable to add an ultraviolet absorber or the like to the molding resin.

The hollow tray of the present invention is as described above. Since the hollow tray is hollow, it is easy to absorb an impact at the time of loading or transporting, and an excessive force is not easily applied to the product. Therefore, it is possible to load articles stably.
Since the hollow tray of the present invention can be produced by blow molding once, the manufacturing cost can be kept low, and it can be easily and easily manufactured as long as a mold is available.
Since the mold is also a blow mold, it can be made much cheaper than the injection mold and various costs can be reduced. Moreover, the tray is highly durable and can be used repeatedly.
Multi-stage packing is also possible, and the capacity for transporting trays after transporting by trays can be reduced compared to the case of loading articles, so return costs can be reduced.
The merit of the present invention is great, for example, it can be modified for a forklift and the pallet can be omitted.

1 ... Articles (tire wheels)
11 ... Rim flange (external side)
12 ... Rim flange (inside the tire)
13 ... rim part 14 ... exterior part 2 ... hollow tray 21 ... gap 22 ... ... Pinch-off part 23 ... Pinch-off part (appearance convex)
24 ... Reinforcing recess (for central part)
25 ......... Recessed recess (for side)
26 ... Reinforcing recess (top groove shape)
27 ... Reinforcing recess (bottom groove shape)
3 ··································································································・ ・ ・ ・ Lower receiving surface 53 ・ ・ ・ ・ ・ ・ ・ ・ Upper standing wall 54 ・ ・ ・ ・ ・ ・ ・ ・ Lower standing wall 55 ・ ・ ・ ・ ・ ・ ・ ・ Upper product part relief 56 ・ ・ ・...... Lower product part relief 57 ... Rim flange relief 571 ... Gap 58 ... Projection

Claims (3)

A hollow tray formed by a blow molding method,
The hollow tray has an upper surface and a lower surface that face each other through a hollow portion,
The upper surface and the lower surface each have a recess for storing an article and a reinforcing recess disposed around the recess,
The bottom of the recess on the top surface and the bottom of the recess on the bottom surface are spaced apart,
A hollow tray, wherein a bottom portion of the reinforcing recess on the upper surface is in contact with a bottom portion of the reinforcing recess on the lower surface.   Each of the upper surface and the lower surface has a support recess disposed around the recess, and the bottom of the support recess on the upper surface and the bottom of the support recess on the lower surface correspond to the article on the upper surface. The hollow tray according to claim 1, wherein the hollow tray can come into contact with the hollow tray when placed in the recess.   The said article | item is a tire wheel, The said recessed part accommodates the said tire wheel vertically, and the bottom face of the said recessed part has a convex part which contact | connects the rim | limb part of the said tire wheel, It is characterized by the above-mentioned. The hollow tray as described in.