JPH0444952A - Olefin buffer palette - Google Patents

Abstract

PURPOSE:To obtain a palette which is excellent in fitting with products, is light and excellent in preventing the products from being damaged and which is easy to handle by forming a recess or a protrusion for maintaining stability with the products at least on one face of an olefin synthetic resin bead expanded molding. CONSTITUTION:A synthetic resin bead expanded molding wherein such a means is constituted that at least one of its faces is formed with a recess 2 or a protrusion 3 for maintaining stability with a product 1 by 2 to 60% to form an olefin buffer palette 4a. With olefin beads, necessary strength for holding a heavy object is sufficiently satisfied, a light weight being a feature of expanded bodies can be utilized, and also due to free modability being a feature of a bead expanded molding, the recess 2 or the protrusion 3 according to the shape of the product 1 can be extremely easily formed even if the palette is to be used for a product with a complicated shape of recesses and protrusions. That is, by using a metal mold for permitting a necessary recess 2 or a protrusion 3 to be molded, the palette can be integrally molded.

Description

DETAILED DESCRIPTION OF THE INVENTION E-INDUSTRIAL APPLICATION FIELD The present invention relates to a pallet that is used as a stand for placing products on F when moving, transporting, or storing various products.

[Prior Art] Conventionally, balents are known to be made of iron or wood, and are used for moving, transporting, and storing various products.

For example, automobile mission cases are manufactured at a foundry, then transported to an assembly factory in a plurality of cases lined up on a single pallet, and then supplied to the assembly line along with the boxes.

[Problem N to be solved by the invention] However, the conventional iron or wooden pallets described above have the following problems.

(1) It is acceptable if the product has a shape that allows it to be placed stably on a pallet, but there are many products that have shapes that do not provide stability just by placing them on a flat surface. In this case, it is necessary to prepare a support or the like to obtain stability, and it takes time and effort to place the products on the pallet.

(2) Products can be transported and stored more efficiently by stacking the pallets on top of each other to save space, but depending on the shape of the products, it may not be possible to stack them stably. In this case as well, it is necessary to prepare a pad or the like for stable stacking, resulting in poor workability.

(3) Iron or wooden pallets are hard, so if you place a product directly on top of it for transportation, there is a high risk that the product will rub against the pallet due to vibrations, etc., and be damaged. Although it is possible to prevent this from occurring, it takes time and effort to prepare and arrange them, and the workability deteriorates.

(4) Iron and wooden pallets are heavy, making them difficult to handle and disadvantageous in terms of transportation efficiency.

(5) When storing pallets, if they are left in a high humidity atmosphere, iron pallets are susceptible to corrosion due to rust, and wooden pallets are susceptible to damage such as corrosion due to moisture absorption, and maintenance is time-consuming.

The present invention has been made in view of the above-mentioned conventional problems.
The problem to be solved is to create a pallet that is easy to handle, has excellent fit with products, is lightweight, has excellent product damage prevention properties, and is easy to handle.

[Means and effects for solving the problems 1L] The means taken in the present invention to solve the problems will be explained with reference to FIGS. 1 and 2, each showing an example. A bead foam molded product having 2 to 6 concave portions 2 or convex portions 3 on at least one side to maintain stability with the product 1.
0% formed olefin buffer pallet 4a, 4b
We are taking measures to do so.

In the present invention, the concave portion 2 or the convex portion 3 that maintains stability with the product 1 may be either the concave portion 2 or the convex portion 3 or both, and at least the upper and lower portions between the product 1 and the present foam ball (4a, 4b). This refers to a device that can prevent wobbling, and preferably also prevents displacement in the left and right direction at the same time.

In the present invention, the olefin-based synthetic resin bead foam molded product is characterized by being lighter than products made of iron, wood, or non-foamed synthetic resin.

By the way, styrene beads are generally widely used because they have good moldability, but due to their low bending strength and tear strength, they lack the strength necessary to hold heavy objects, and when used alone, they cannot be used on pallets. In order to satisfy the practical strength that cannot be used as a foam, it is necessary to simultaneously mold a reinforcing material or a reinforcing plate or use it as an auxiliary tool, which makes it impossible to take advantage of the lightweight advantage of being a foam.

On the other hand, olefin beads have sufficient strength to hold a single weight object, making it possible to take advantage of the lightness that is a feature of foam, as well as the freedom that is a feature of bead foam molded products. Due to the moldability, even when the product l has a complicated uneven shape, it is possible to extremely easily form the recesses 2 or the protrusions 3 according to the shape of the product l.

That is, by using a mold that can form the necessary concave portions 2 or convex portions 3, a pallet having the island shape can be easily integrally molded.

Here, the olefin-based synthetic resin beads are preferably polymers or copolymers whose main component is high-density polyethylene, low-density polyethylene, or polypropylene (containing 50% or more of these by weight); The polymer may or may not be crosslinked.

The expansion ratio is preferably in the range of 4 to 50 times (in terms of specific gravity 1), more preferably 5 to 30 times. When the expansion ratio is less than 4 times, the beads are difficult to fuse and become heavy, resulting in poor handling. If the foaming ratio exceeds 50 times, the load-bearing strength will be low and it will be easy to bend, making it difficult to use.

In the above range, the cracking of molded products and the loss of beads between beads, which are characteristics of olefin beads, are significantly less than those of styrene beads. becomes the optimal molded product.

In the present invention, the ratio of the concave portions 2 or convex portions 3 on the surface is determined by the shape of the product l, one present olefin buffer pallet 4a,
It is determined by the number of products 1 placed on 4b, but it needs to be 2 to 60% of the total area on one side, preferably 5
~50% range. If it is less than 2%, a fixed part that stabilizes the product 1 cannot be obtained, and if it is more than 60%, it is not possible to stabilize the product 1 and obtain the strength of the member.

As a result of the above, the product 1 and the present olefin buffer pallet 4a,
4b, product 1
It is possible to create a highly reliable pallet that does not disintegrate even when subjected to low-cycle vibrations over a long period of time, such as during storage, transportation on an assembly line, and loading onto a truck.

In particular, as shown in FIG.
The dimensions between the olefin buffer pallets 4b when the product l is stacked together with the olefin buffer pallets 4b are the same as the distance between the pallets when ordinary iron or wooden pallets are used. The dimension l can be smaller than the dimension l.

In general, the dimension 1 between the pallets when the products 1 are stacked on each pallet is determined by applying a thicker backing material to the product 1. Since it is necessary to absorb it, it increases according to the following formula.

J = Maximum product height + Pallet wall thickness Dimensions and complexity of the shape of the pallet However, in the present olefin buffer pallet 4b,
1: Since the padding material as shown below is not required, the dimensions between the present olefin buffer pallets 4b are as shown in the following formula.

L=maximum product height +α≦maximum product height+pallet wall thickness (1) (however, 0≦α≦t) In other words, one feature of the present invention is that This also improves volumetric efficiency during storage. Moreover, especially when assembling by robots, the dimensions for taking out products are limited, so if the distance between pallets is short as in the present invention, it is generally possible to take out a large number of products, which improves production efficiency.

Also, since it is a synthetic resin foam molded product, it has excellent cushioning performance. It is preferable that the dynamic buffer coefficient (C factor) is at least 5 or less, particularly 4.5 or less, as an average value of 2 to 5 drops at a sample thickness of 5 cm and a drop height of 60 cm. If it exceeds 5, the G value will increase or the thickness of the pallet will increase, resulting in poor loading efficiency.

The present olefinic buffer barrels h4a and 4b have excellent surface protection performance for product l.

In other words, the present olefinic buffered ballet 4a.

The shape of 4b is an integrally molded product, and its fit with product 1 is significantly higher than those made of iron or wood.

Even if it is made of iron or wood, it can be made to the same extent as the present invention as long as it is wrapped and fixed excessively, but the packaging labor and cost will be great. This olefin buffer pallet 4a, 4b
In the case of , the material has a high degree of adhesion with the product due to its softness, so it is easy to move with the product 1 against repeated vibrations and is less likely to rub. The wood olefin buffer pallets 4a, 4b are soft and have the ability to significantly reduce scratches, and are also characterized by ease of storage.

That is, iron pallets are sensitive to moisture (particularly oxygen) and easily corrode. Wood absorbs moisture and causes an increase in the amount of balls and corrosion, but the present olefin buffer pallets 4a and 4b have chemical resistance, which is a characteristic of olefin synthetic resins, and have low moisture absorption, so corrosion does not occur. It is easy to clean and hygienic even if it gets dirty.

[Embodiment] FIG. 1 shows an embodiment of the present invention, in which a single olefin buffer 4a has concave portions 2 and convex portions 3 on its upper surface.

The recesses 2 are of two types: shallow recesses 2a and deep recesses 2b, and the protrusions 3 are also of two types: low protrusions 3a and high protrusions 3b. Moreover, although the recesses 2 in this embodiment are all groove-shaped, the four parts 2 in the present invention are not limited to such groove-like shapes, and may be punch-shaped. .

The product 1 is approximately in the shape of a gourd, and its large circumference is housed in a deep recess 2b, and its small circumference is housed in a shallow recess 2a.
The large circumferential part of the product l is placed in a high convex part 2.
b, and the small circumferential portion is supported by the low convex portion 2a.

Therefore, the product 1 is supported by the concave portions 2 and the convex portions 3 and placed on the present olefin buffer pallet 4a in a stable state.

The present olefin buffer pallet 4a is integrally molded by bead foam molding of an olefin synthetic resin.The mold for bead foam molding of the olefin buffer pallet 4a is a general casting product. However, especially when used as a pallet for placing products to be assembled by robots (robot debarre), high dimensional accuracy is required. preferable.

The synthetic resin constituting the present olefin buffer pallet 4a is not particularly limited as long as it can be bead-foamed. Polymers or copolymers (containing 50% by weight or more of This makes it possible to use it repeatedly over a long period of time. In addition, the surface is less likely to get hangnails even after repeated use, and appropriate cushioning properties are obtained, so the product 1 is excellently protected, and it is easy to prevent the product 1 from being damaged.

The density of the synthetic resin bead foam constituting the present olefin buffer pallet 4a is preferably 33 to 200 kg/m" in order to satisfy the necessary strength, lightness, cushioning properties, etc. For this reason, the foaming ratio is
In terms of specific gravity, it is preferably about 4 to 50 times, preferably about 5 to 30 times.

The synthetic resin bead foam constituting this olefin-based buffer barrier) 4a has a tear strength of 2 to 13 kg/c.
It is preferably carbon dioxide, and has a tensile strength of 3 to 20 k.
Preferably it is 2 g/c fat. If the tear strength and tensile strength are too low, cracks and chips will easily occur during use.
It becomes impossible to use it repeatedly, and conversely, if it is too high, the density becomes high and it becomes difficult to obtain the necessary lightness and cushioning properties.

In particular, the effect of preventing scratches caused by rubbing between the present olefin buffer pallet (4a) and the product 1 is largely due to the presence of a skin layer formed on the surface of the foamed synthetic resin bead molded product. This part has a much lower degree of foaming than the central bubble layer, has no roughness, and easily adheres to Product 1, so even if Product 1 has a surface coating, it will not be scratched by rubbing. It is difficult for this to occur.

Therefore, it is preferable that the wood olefin buffer pallet 4a has the low-density layer formed thereon, with no bubble layer exposed through cutting or cutting, at least in the part that comes into contact with the product. The thickness is preferably 10-10001L so that it does not easily tear during use, exposing the bubble layer, and does not excessively increase the overall density.

FIG. 2 shows another embodiment of the present invention, which is the same as that shown in FIG. 1 except for the fact that a concave portion 2 and a convex portion 3 are also provided on the lower surface side.

As shown in FIG. 3, the concave portion 2 and convex portion 3 on the lower surface side are
When stacking product 1 together with the present olefin buffer pallet 4b, the upper part of product l and the present olefin buffer pallet) 4
This is to ensure stability between the lower surfaces of b. Similarly to the upper surface side, the recesses 2 and the protrusions 3 on the lower surface side have a shallow recess 2a, a deep recess 2b, a low protrusion 3a, and a high protrusion 3b, and these are provided at the same vertical positions as the upper surface side. The present olefin buffer pallet (4b) can be placed almost horizontally on the product l.

The lowest olefinic buffer pallet shown in Figure 3) 4
(a) is the foam barre shown in Fig. 1 with recesses 2 and protrusions 3 formed only on the top surface, since it is not intended to be placed over the product 1).
It is 4a. However, even if the olefin buffer pallet 4b has concave portions 2 and convex portions 3 formed on both sides, if the height of the convex portions 3 on the lower surface is approximately constant and is formed without large deviations, this is the best option. It can also be used on the bottom.

FIGS. 4 and 5 are a plan view and a bottom view of an olefin buffer pallet 4b used as a robot debarre for transmission cases of automobiles.

Four parts 2 and a convex part 3 are formed on both the upper surface side and the lower surface side, and in particular, some of the recesses 2 are formed into hollow recesses 2c.

The olefin buffer pallet (4b) shown in Figures 4 and 5 is foam-molded using polyethylene synthetic resin beads, and six Me2 John cases are placed on one olefin buffer pallet (4b). When these were stacked in multiple tiers for transportation, there was no load drop, no cracking of the foam pallet 4b, and no damage to the transmission case, even though they were transported over rough roads for about 3 hours. Ta.

Table 1 shows the results of a comparative test between the product of the present invention and the conventional product.

(Leaving space below) Table (sample) A: Pallet made of low-density polyethylene (10x "Metsu" manufactured by Asahi Kasei Corporation) B: JO-x foamed product made of commercially available polystyrene beads Pallet C: Two iron pallets D Product reusable pallet (commercial product) (Evaluation criteria) 0 Good △: Slightly inferior ×: Inferior × × = Practically problematic [Effects of the invention] The present invention is as explained above, This has the following effects.

(1) The product 1 of any shape can be placed in a stable state, there is no need to arrange a pad or the like to obtain stability, and excellent workability can be obtained when storing the product.

(2) By providing the concave portions 2 and the convex portions 3 on the upper and lower surfaces, the product 1 can be stacked in multiple stages in a stable state by being placed over the product 1. Therefore, it does not take up much space during transportation or storage.
It can improve the efficiency of transportation and storage.

(3) Excellent protection for product 1, so product 1 is protected during transportation, etc.
It won't hurt.

(,1) Since it is lightweight, it is easy to carry and has excellent handling properties, and does not become an extra load during transportation and reduce transportation efficiency.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the olefin-based buffer pallet of the present invention, Fig. 2 is a perspective view showing another embodiment of the olefin-based buffer pallet of the present invention, and Fig. 3 is a perspective view showing an embodiment of the olefin-based buffer pallet of the present invention. 4 and 5 are a plan view and a bottom view of an olefin-based buffer pallet for a transmission case of an automobile. 1: product, 2: recess, 2a: shallow recess, 2b: deep recess, 2C: punched recess, 3: protrusion, 3a: low recess, 3b=
High recess, 4: Genuine olefin buffer pallet.

Claims (1)

[Claims] (1) An olefin-based buffer pallet, which is an olefin-based synthetic resin bead foam molded product, and has 2 to 60% of concave or convex portions formed on at least one side to maintain stability with the product.