JP4908850B2 - Plastic pallet - Google Patents

Plastic pallet Download PDF

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JP4908850B2
JP4908850B2 JP2006006584A JP2006006584A JP4908850B2 JP 4908850 B2 JP4908850 B2 JP 4908850B2 JP 2006006584 A JP2006006584 A JP 2006006584A JP 2006006584 A JP2006006584 A JP 2006006584A JP 4908850 B2 JP4908850 B2 JP 4908850B2
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bending strength
pallet
girder
molding
molding material
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JP2007186244A (en
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篤史 小島
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Gifu Plastic Industry Co Ltd
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Gifu Plastic Industry Co Ltd
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Description

本発明は、曲げ強度の強い合成樹脂製パレットに関するものである。   The present invention relates to a synthetic resin pallet having high bending strength.

従来から合成樹脂製のパレットにおいて、パレット下部を強化するものが特許文献１により知られている。   Conventionally, a pallet made of synthetic resin that reinforces the lower part of the pallet is known from Patent Document 1.

この特許文献１に示される従来例は、合成樹脂製のパレットの下部の全面部にタルクを添加することで補強するようにしている。しかしながら、この従来例においては、パレットにおいて、最も強度（曲げ強度）が必要な部分のみを補強するものではなく、下部全面を補強するものであるから、不必要な箇所も補強することになって、コストが高くなり、また、タルクを添加した成形材料は流れが悪いため、この流れの悪い成形材料で下部全面を成形する従来例は成形性が悪くなると共に重くなるという問題がある。   The conventional example shown in Patent Document 1 is reinforced by adding talc to the entire lower surface of a synthetic resin pallet. However, in this conventional example, the pallet does not reinforce only the portion that requires the most strength (bending strength), but reinforces the entire lower portion, so that unnecessary portions are also reinforced. The cost increases, and the molding material to which talc is added has a poor flow. Therefore, the conventional example in which the entire lower surface is molded with the molding material having the poor flow has a problem that the moldability deteriorates and becomes heavy.

また、上記特許文献１に示された従来例にあっては、下部の全面部にタルクを添加した成形材料で成形しているため、下部の最外周端もタルクを添加した成形材料で成形してある。ところで、タルクを添加した成形材料で成形した部位は曲げ強度は強いが耐衝撃性が劣り、このため、フォークの先端などが最外周端に衝突したり、パレットが落下した場合に最外周端に衝撃が加わると最外周端が破損し易いという問題がある。また、タルクを添加した成形材料で成形した部位は、もろくなり、自動倉庫のチェーンコンベア等の搬送装置でパレットを搬送すると、パレットが削れて塵の発生に繋がる。
特開平１１−２６８７４０号公報 Moreover, in the conventional example shown in the above-mentioned Patent Document 1, since the molding is performed with a molding material with talc added to the entire lower surface, the outermost peripheral end of the lower part is also molded with a molding material with talc added. It is. By the way, the part molded with a molding material added with talc has strong bending strength but poor impact resistance.For this reason, if the tip of the fork collides with the outermost peripheral edge or the pallet falls, When an impact is applied, there is a problem that the outermost peripheral end is easily damaged. Moreover, the site | part shape | molded with the molding material which added the talc becomes fragile, and if a pallet is conveyed with conveying apparatuses, such as a chain conveyor of an automatic warehouse, a pallet will be shaved and it will lead to generation | occurrence | production of dust.
JP-A-11-268740

本発明は上記の従来の問題点に鑑みて発明したものであって、低コストで曲げ強度が強く、成形性も優れ、更に、最外周端にフォークの先端等が衝突したり、落下して衝撃が加わっても破損し難く、チェーンコンベア等で削れ難い合成樹脂製パレットを提供することを課題とするものである。   The present invention was invented in view of the above-mentioned conventional problems, and was low in cost, strong in bending strength, excellent in formability, and further, the tip of the fork collided with the outermost peripheral end or dropped. It is an object of the present invention to provide a synthetic resin pallet which is not easily damaged even when an impact is applied and which is difficult to be cut by a chain conveyor or the like.

上記課題を解決するために本発明に係る合成樹脂製パレットは、載置物を載置するためのデッキ部１と、四隅、及び、中央、及び、４辺における各辺の中間にそれぞれ桁部２とを備え、桁部２間がフォーク挿入部３となった４方差しの合成樹脂製のパレット４において、該パレット４の四隅の各桁部２と隣接する中間の桁部２との間を繋ぐ部位、又は、中央の桁部２と隣接する４つの中間の桁部２との間を繋ぐ部位、又は、中央の桁部２と四隅の桁部２とを繋ぐ部位に、デッキ部１の裏面の桁部２間に架け渡される複数の補強リブ６が設けられ、この四隅の各桁部２と隣接する中間の桁部２との間を繋ぐ部位、又は、中央の桁部２と隣接する４つの中間の桁部２との間を繋ぐ部位、又は、中央の桁部２と四隅の桁部２とを繋ぐ部位において、上記補強リブ６の一部とデッキ部１の一部と筒状をした桁部２の一部を一体化して、この一体化した上記補強リブの一部とデッキ部の一部と筒状をした桁部の一部が、他の部位を成形する成形材料よりも曲げ強度の強い補強材が添加された成形材料を用いた二色成形又はサンドイッチ成形又はインサート成形により一体に成形されて曲げ強度補強部５となり、上記曲げ強度補強部５の端部がパレット４の最外周端よりパレット４の内側方向に引き込んだ位置であることを特徴とするものである。 In order to solve the above problems, a synthetic resin pallet according to the present invention includes a deck portion 1 for placing an object to be placed , and a girder portion 2 in the middle of each side of the four corners, the center, and the four sides. with the door, in the synthetic resin pallets 4 of 4-way entry of between girder 2 becomes fork insertion portion 3, between the middle of the column portions 2 adjacent to each girder 2 of the four corners of the pallet 4 The part of the deck part 1 is connected to the part to be connected, or the part to connect between the central girder part 2 and the four intermediate girder parts 2 adjacent to each other, or the part to connect the central girder part 2 and the girder parts 2 at the four corners . A plurality of reinforcing ribs 6 are provided so as to be bridged between the spar portions 2 on the back surface, and the portions connecting the respective spar portions 2 at the four corners with the adjacent intermediate spar portion 2 or adjacent to the central spar portion 2 In the part that connects between the four intermediate girders 2 or the part that connects the central girders 2 and the four girders 2 A part of the reinforcing rib 6, a part of the deck part 1 and a part of the cylindrical girder part 2 are integrated, and a part of the integrated reinforcing rib, a part of the deck part and a cylinder are formed. Bending strength is partly formed by two-color molding, sandwich molding, or insert molding using a molding material to which a reinforcing material having a bending strength stronger than that of the molding material for molding other parts is added. It becomes the reinforcing part 5, and the end of the bending strength reinforcing part 5 is a position where it is drawn inward from the outermost peripheral end of the pallet 4 toward the inside of the pallet 4.

このように４方差しの合成樹脂製のパレット４において、該パレット４の四隅の各桁部２と隣接する中間の桁部２との間を繋ぐ部位、又は、中央の桁部２と隣接する４つの中間の桁部２との間を繋ぐ部位、又は、中央の桁部２と四隅の桁部２とを繋ぐ部位に、デッキ部１の裏面の桁部２間に架け渡される複数の補強リブ６が設けられ、この四隅の各桁部２と隣接する中間の桁部２との間を繋ぐ部位、又は、中央の桁部２と隣接する４つの中間の桁部２との間を繋ぐ部位、又は、中央の桁部２と四隅の桁部２とを繋ぐ部位において、上記補強リブ６の一部とデッキ部１の一部と筒状をした桁部２の一部を一体化して、この一体化した上記補強リブの一部とデッキ部の一部と筒状をした桁部の一部が、他の部位を成形する成形材料よりも曲げ強度の強い補強材が添加された成形材料を用いた二色成形又はサンドイッチ成形又はインサート成形により成形されて曲げ強度補強部５となっていることで、例えば、自動倉庫のチェーンコンベアやローラコンベア等の搬送装置上に４方差しのパレット４を載せて、左右の二箇所で支持する際に曲げ強度補強部５により効果的に補強ができるものであり、また、全面を曲げ強度の強い成形材料で成形するのではなく、桁部２間を繋ぐ部位を曲げ強度の強い成形材料を用いて成形するので、高価な曲げ強度の強い成形材料の使用量が少なくてコストを低減できると共に、曲げ強度の強い成形材料は流動性が悪いが使用量が少ないので、成形性が悪くなるのを抑制できる。 In this way, in the pallet 4 made of synthetic resin of four-way insertion, the part connecting the respective beam portions 2 at the four corners of the pallet 4 and the adjacent intermediate beam portion 2, or adjacent to the central beam portion 2. A plurality of reinforcements bridged between the beam portions 2 on the back surface of the deck portion 1 at a portion connecting the four middle beam portions 2 or a portion connecting the central beam portion 2 and the four corner beam portions 2. Ribs 6 are provided to connect the portions between the four spars 2 at the four corners and the adjacent intermediate spar 2 or between the central spar 2 and the four intermediate spars 2 adjacent to each other. In a part or a part connecting the central girder part 2 and the girder part 2 at the four corners, a part of the reinforcing rib 6 and a part of the deck part 1 and a part of the cylindrical girder part 2 are integrated. some of the girder portion in which the portion a cylindrical portion and a deck portion of the integral the reinforcing ribs, than the molding material for molding the other part flexural strength It is formed by two-color molding, sandwich molding, or insert molding using a molding material to which a strong reinforcing material is added to form a bending strength reinforcing portion 5, for example, transportation of chain conveyors, roller conveyors, etc. in automatic warehouses The four- sided pallet 4 is placed on the device and can be effectively reinforced by the bending strength reinforcing portion 5 when it is supported at the two left and right positions, and the entire surface is molded with a molding material having high bending strength. Rather than using a molding material with high bending strength, the part connecting the beam portions 2 is molded using a molding material with high bending strength. Although the molding material is poor in fluidity, the amount used is small, so that deterioration of the moldability can be suppressed.

また、桁部２を繋ぐ部位を成形するための成形材料中に補強材が添加してあるので、タルクのような補強材を添加するという簡単な構成で、パレット４の桁部２間を繋ぐ部位に、他の部位を成形する成形材料よりも曲げ強度の強い成形材料で成形した曲げ強度補強部５を設けることができる。   Further, since the reinforcing material is added to the molding material for molding the portion connecting the beam portions 2, the beam portions 2 of the pallet 4 are connected with a simple configuration in which a reinforcing material such as talc is added. A bending strength reinforcing portion 5 formed of a molding material having a bending strength stronger than that of the molding material for molding other portions can be provided at the site.

また、桁部２間を繋ぐ曲げ強度補強部５は、桁部２の一部を含ませて一体に成形してあるので、高価な曲げ強度の強い成形材料の使用量をできるだけ少なくしながら桁部２間を繋ぐ部位をより曲げ強度の強い部位とすることができる。また、パレット４表面から荷重が掛かっても、桁部２の外側（フォーク挿入部３側）が基点になって曲って破損することがない。   Further, the bending strength reinforcing portion 5 that connects between the girder portions 2 is integrally formed by including a part of the girder portion 2, so that the girder can be used while minimizing the amount of expensive molding material having high bending strength. The site | part which connects between the parts 2 can be made into a site | part with stronger bending strength. Even if a load is applied from the surface of the pallet 4, the outer side of the beam part 2 (fork insertion part 3 side) is not bent and damaged.

また、曲げ強度の強い成形材料で成形した曲げ強度補強部５の端部がパレット４の最外周端よりパレット４の内側方向に引き込んだ位置であるので、桁部２を繋ぐ部位に曲げ強度の強い成形材料で成形した曲げ強度補強部５を設けるといえども、パレット４の最外周端が耐衝撃性の劣る曲げ強度の強い材料で成形してなく、フォークの先端などが最外周端に衝突したり、パレットが落下して最外周端に衝撃が加わっても最外周端が破損し難いものである。また、パレット４の一部を持ち上げてパレット４を引きずりながら移動しても、削れて塵が発生し難いものである。つまり、自動倉庫で利用の際の曲げ強度が強く、しかも、最外周端に衝撃が作用しても破損し難く削れ難いパレット４を提供できる。   Further, since the end of the bending strength reinforcing portion 5 formed of a molding material having a high bending strength is a position drawn from the outermost peripheral end of the pallet 4 toward the inside of the pallet 4, the bending strength is applied to the portion connecting the beam portions 2. Even if the bending strength reinforcement part 5 formed with a strong molding material is provided, the outermost peripheral end of the pallet 4 is not molded with a material having a high bending strength with poor impact resistance, and the tip of the fork collides with the outermost peripheral end. Even if the pallet falls and an impact is applied to the outermost peripheral end, the outermost peripheral end is not easily damaged. Further, even if a part of the pallet 4 is lifted and moved while dragging the pallet 4, it is difficult to be scraped off and generate dust. That is, it is possible to provide a pallet 4 that has a high bending strength when used in an automatic warehouse, and that is not easily damaged even if an impact is applied to the outermost peripheral end.

本発明は、高価な曲げ強度の強い成形材料の使用量を少なくして、自動倉庫で支持する際に強い曲げ強度を効果的に発揮することができ、また、高価な曲げ強度の強い成形材料の使用量が少なくてコストを低減できると共に、曲げ強度の強い成形材料は流動性が悪いが使用量が少ないので、成形性が悪くならない。   The present invention reduces the amount of expensive molding material having high bending strength, can effectively exert strong bending strength when supported in an automatic warehouse, and is expensive and has high bending strength. The molding material having a high bending strength has poor flowability but the molding amount does not deteriorate because the usage amount is small.

以下、本発明を添付図面に示す実施形態に基いて説明する。   Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

合成樹脂製のパレット４は載置物を載置するためのデッキ部１と、複数の桁部２とを備えたもので、桁部２間がフォーク挿入部３となっている。   The pallet 4 made of synthetic resin is provided with a deck portion 1 for placing a placement object and a plurality of girders 2, and a fork insertion portion 3 is formed between the girders 2.

ここで、合成樹脂製のパレット４としては、全体を合成樹脂の一体成形により成形する一体成形型のパレット４と、上半体４ａと、下半体４ｂとを別々に成形して上半体４ａと下半体４ｂとを溶着一体化して成形する溶着タイプのパレット４とに大別でき、更に、一体成形型のパレット４、溶着タイプのパレット４のいずれのタイプも、上面部のみが載置物を載置するためのデッキ部となり、下面部に開口部を形成した片面使用タイプと、上面部及び下面部がいずれもデッキ部となり、上下反転することで、いずれも面もデッキ部として使用できる両面使用タイプのものとがある。   Here, as the pallet 4 made of synthetic resin, the upper half body is formed by separately molding the integrally molded pallet 4 which is molded by synthetic resin integral molding, the upper half body 4a and the lower half body 4b separately. 4a and the lower half 4b can be roughly divided into a welding type pallet 4 which is formed by welding and integration. Further, only the upper surface portion of each of the integrally-molding pallet 4 and the welding type pallet 4 is mounted. It becomes a deck part for placing figurines, a single-sided use type in which an opening is formed on the lower surface part, and both the upper surface part and the lower surface part become deck parts, and both surfaces are used as deck parts by flipping up and down Some types can be used on both sides.

そして、本発明においては、パレット４の桁部２間を繋ぐ部位に、他の部位を成形する成形材料よりも曲げ強度の強い成形材料で成形した曲げ強度補強部５を設けたことに特徴があり、パレット４のタイプとしては上記のいずれのタイプのパレット４であってもかまわない。また、パレット４の桁部２間を繋ぐ部位に設ける曲げ強度補強部５は、パレット４の上面側のみに設けても、下面側のみに設けても、また、上面側と下面側の両方に設けてもよい。   In the present invention, a feature is provided in that a bending strength reinforcing portion 5 formed of a molding material having a higher bending strength than a molding material for molding the other portion is provided at a portion connecting between the beam portions 2 of the pallet 4. Yes, the pallet 4 may be any type of pallet 4 described above. Moreover, the bending strength reinforcement part 5 provided in the site | part which connects between the girder parts 2 of the pallet 4 may be provided only on the upper surface side of the pallet 4, only on the lower surface side, or on both the upper surface side and the lower surface side. It may be provided.

以下添付図面に示す実施形態では、溶着タイプのパレット４で両面使用タイプの例（つまり上下両面がデッキ部１となっている例）を示して説明する。   Hereinafter, in the embodiment shown in the accompanying drawings, an example of a double-sided use type (that is, an example in which the upper and lower sides are the deck portion 1) is shown and described in the welding type pallet 4.

図１、図２に示すように、合成樹脂により一体成形した上半体４ａは、上面がデッキ部１（１ａ）となり、デッキ部１ａの下面に複数の筒状をした上桁部２ａを一体に垂設して構成してあり、合成樹脂により一体成形した下半体４ｂは、下面がデッキ部１（１ｂ）となり、デッキ部１ｂの上面に複数の筒状をした下桁部２ｂを上方に向けて一体に突設して構成してあり、上記の上半体４ａの上桁部２ａの下端面部と下半体４ｂの下桁部２ｂの上端面部とを熱溶着して上桁部２ａと下桁部２ｂとで桁部２を一体化することでパレット４を構成してある。   As shown in FIG. 1 and FIG. 2, the upper half 4a integrally formed of synthetic resin has a deck portion 1 (1a) on the upper surface, and a plurality of cylindrical upper beams 2a are integrally formed on the lower surface of the deck portion 1a. The lower half 4b formed integrally with the synthetic resin and integrally formed with a synthetic resin has a lower surface serving as a deck portion 1 (1b), and a plurality of cylindrical lower girders 2b formed on the upper surface of the deck portion 1b. The upper girder part is formed by projecting integrally toward the upper part of the upper half 4a by thermally welding the lower end part of the upper girder part 2a of the upper half part 4a and the upper end part of the lower girder part 2b of the lower half part 4b. The pallet 4 is constituted by integrating the girder part 2 with 2a and the lower girder part 2b.

上記上半体４ａと下半体４ｂとは同じ形状をしていて同じ成形金型により成形したものであってもよく、あるいは、異なる形状をしていて異なる成形金型により成形したものであってもよい。   The upper half 4a and the lower half 4b may have the same shape and are molded with the same molding die, or have different shapes and are molded with different molding dies. May be.

なお、以下の説明では特別区別する必要がある場合を除き、デッキ部１ａ、デッキ部１ｂはいずれも単にデッキ部１と表現し、上桁部２ａ、下桁部２ｂはいずれも単に桁部２として表現して説明する。   In the following description, the deck portion 1a and the deck portion 1b are both simply expressed as the deck portion 1, and the upper girder portion 2a and the lower girder portion 2b are both simply the girder portion 2 unless special distinction is necessary. It expresses and explains as.

添付図面に示す実施形態ではパレット４の上面部と下面部とにおける桁部２を繋ぐ部位に曲げ強度補強部５を設けた例が示してある。   In the embodiment shown in the accompanying drawings, an example is shown in which a bending strength reinforcing portion 5 is provided at a portion connecting the girder portion 2 in the upper surface portion and the lower surface portion of the pallet 4.

桁部２間を繋ぐ部位にはデッキ部１の裏面側（デッキ部１ａの下面側、デッキ部１ｂの上面側）に複数の補強リブ６が設けてあり、図１乃至図５に示す実施形態では、この桁部２間を繋ぐ部位において、補強リブ６の一部とデッキ部１の一部が、他の部位を成形する成形材料よりも曲げ強度の強い成形材料で成形した曲げ強度補強部５となっている。作図上曲げ強度の強い材料で成形した曲げ強度補強部５を多数のドットを施して描いている。   A plurality of reinforcing ribs 6 are provided on the back surface side of the deck portion 1 (the lower surface side of the deck portion 1a and the upper surface side of the deck portion 1b) at the portion connecting the beam portions 2, and the embodiment shown in FIGS. Then, in the part which connects between these girder parts 2, a part of the reinforcing rib 6 and a part of the deck part 1 are formed with a bending strength reinforcing part formed of a molding material whose bending strength is stronger than the molding material for molding the other part. 5 In the drawing, the bending strength reinforcing portion 5 formed of a material having high bending strength is drawn with a large number of dots.

パレット４の上記曲げ強度補強部５以外の部位は、例えば、通常のポリプロピレンにより成形し、曲げ強度補強部５は上記通常のポリプロピレンよりも曲げ強度が強い物性のポリプロピレンや、あるいは、通常のポリプロピレンにタルクを添加した成形材料を使用して成形してある。パレット４の曲げ強度補強部５を成形するための曲げ強度の強い成形材料はバージン材を用いるが、曲げ強度補強部５を成形する部分以外の部位を成形するための成形材料はバージン、再生材のいずれであってもよい。   The parts of the pallet 4 other than the bending strength reinforcing portion 5 are formed of, for example, ordinary polypropylene, and the bending strength reinforcing portion 5 is made of polypropylene having physical properties that have higher bending strength than the normal polypropylene or normal polypropylene. It is molded using a molding material to which talc is added. A virgin material is used as a molding material having a high bending strength for molding the bending strength reinforcing portion 5 of the pallet 4, but a molding material for molding a portion other than a portion where the bending strength reinforcing portion 5 is molded is a virgin or recycled material. Any of these may be used.

ところで、曲げ強度の強い成形材料はタルクを添加したりして高価で流動性が悪いが、上記のように、桁部２間を繋ぐ部位にのみ少量使用するだけであるから、コストが高くなるのを抑え、且つ、成形性の低下も防止できる。なお、タルクを添加することによって重量が増すものの、少量使用するに過ぎないので、それほど重くならない。また、パレット４の桁部２間を繋ぐ部位に、他の部位を成形する成形材料よりも曲げ強度の強い成形材料で成形した曲げ強度補強部５を設けることで、自動倉庫においてパレット４を取り扱う際に、最も曲げ強度を必要とする箇所は、桁部２間を繋ぐ部位であるため、この部分を重点的に補強することで、全体として曲げ強度の強い成形材料の使用料を少なくして高い曲げ強度を有するパレット４を提供できることになる。   By the way, a molding material with high bending strength is expensive and poor in fluidity due to the addition of talc. However, as described above, only a small amount is used for the portion connecting between the spar portions 2, so that the cost increases. Can be suppressed, and deterioration of moldability can also be prevented. In addition, although the weight increases by adding talc, it is not so heavy because it is used only in a small amount. Further, the pallet 4 is handled in an automatic warehouse by providing a bending strength reinforcing portion 5 formed of a molding material having a higher bending strength than a molding material for molding other portions at a portion connecting the beam portions 2 of the pallet 4. At that time, the place that needs the most bending strength is the part that connects between the girder parts 2, so by reinforcing this part intensively, the usage fee of the molding material with high bending strength as a whole can be reduced. The pallet 4 having high bending strength can be provided.

図１乃至図５、図６乃至図１６には桁部２と桁部２との間を繋ぐ部位に、曲げ強度補強部５を設ける位置の各例を示してある。   FIGS. 1 to 5 and FIGS. 6 to 16 show examples of positions where the bending strength reinforcing portion 5 is provided at a portion connecting the beam portion 2 and the beam portion 2.

図１乃至図５には、４方差しのパレット４において、図２、図４の縦方向、横方向に隣合う桁部２と桁部２とを繋ぐ部分をそれぞれ他の部位を成形する成形材料よりも曲げ強度の強い成形材料で成形して曲げ強度補強部５を設けた例が示してある。   1 to 5, in the four-way pallet 4, moldings for forming other portions of the portions connecting the spar 2 and the spar 2 adjacent to each other in the vertical and horizontal directions in FIGS. 2 and 4 are performed. An example in which a bending strength reinforcing portion 5 is formed by molding with a molding material having a bending strength stronger than that of the material is shown.

また、図６には、４方差しのパレット４において、図６の縦方向、横方向に隣合う桁部２と桁部２とを繋ぐ部分をそれぞれ他の部位を成形する成形材料よりも曲げ強度の強い成形材料で成形した曲げ強度補強部５とすることに加え、外周に位置するすべての桁部２を繋ぐ部分と外周に位置する桁部２の一部が連続するように曲げ強度補強部５の一部がロ字状部となっている例が示してある。この実施形態では外周部にロ字状部が形成してあるため、全体としての曲げ強度がより強固となる。   Further, in FIG. 6, in the four-way pallet 4, the portions connecting the spar 2 and the spar 2 adjacent to each other in the vertical direction and the horizontal direction in FIG. In addition to the bending strength reinforcement portion 5 formed of a strong molding material, the bending strength reinforcement is made so that a portion connecting all the girder portions 2 located on the outer periphery and a part of the girder portion 2 located on the outer periphery are continuous. An example in which a part of the part 5 is a square-shaped part is shown. In this embodiment, since the square-shaped part is formed in the outer peripheral part, the bending strength as a whole becomes stronger.

また、図７には４方差しのパレット４において、縦方向、横方向にそれぞれ隣合う桁部２と桁部２を繋ぐ部位にそれぞれ複数本の曲げ強度補強部５を設けた例が示してある。 Further, FIG. 7 shows an example in which a plurality of bending strength reinforcing portions 5 are provided at portions connecting the spar 2 and the spar 2 adjacent to each other in the longitudinal direction and the lateral direction in the four-way pallet 4. is there.

また、図８には４方差しのパレット４において、縦方向、横方向にそれぞれ隣合う桁部２と桁部２を繋ぐ部位にそれぞれ複数本の曲げ強度補強部５を設けると共に、更に、パレット４の上面部と下面部とに設けた曲げ強度補強部５の位置が上面部と下面部とで平面視においてずれている例であり、図８の実施形態では上面部に設けた曲げ強度補強部５Ａと下面部に設けた曲げ強度補強部５Ｂとが内外方向にずれている例が示してある。 Further, in FIG. 8 , in the four-way pallet 4, a plurality of bending strength reinforcing portions 5 are provided at portions connecting the spar 2 and the spar 2 adjacent to each other in the vertical direction and the horizontal direction, respectively. 4 is an example in which the position of the bending strength reinforcing portion 5 provided on the upper surface portion and the lower surface portion is shifted in plan view between the upper surface portion and the lower surface portion . In the embodiment of FIG. An example in which the portion 5A and the bending strength reinforcing portion 5B provided on the lower surface portion are displaced in the inner and outer directions is shown.

上記の各例は４方差しパレット４において、縦方向、横方向にそれぞれ隣合う桁部２と桁部２を繋ぐ縦方向、横方向の繋ぎ部位のすべてに曲げ強度補強部５を設けた例を示したが、図９、図１０のように４方差しパレット４において、外周に位置する隣接する桁部２同士を繋ぐ部位に曲げ強度補強部５で設けても良い。ここで、図９は外周に位置する隣接する桁部２と桁部２との間の部位のみに設けたものを示し、図１０は外周に位置するすべての桁部２を繋ぐ部分と外周に位置する桁部２の一部が連続するように曲げ強度補強部５がロ字状部となっている例が示してある。 In each of the above examples, in the four-way pallet 4, the bending strength reinforcing portions 5 are provided in all of the connecting portions in the vertical direction and the horizontal direction connecting the girder portions 2 adjacent to each other in the vertical direction and the horizontal direction, respectively. However, in the four-way pallet 4 as shown in FIG. 9 and FIG. 10 , the bending strength reinforcing portion 5 may be provided at a portion connecting adjacent beam portions 2 positioned on the outer periphery. Here, FIG. 9 shows what was provided only in the site | part between the adjacent girder part 2 located in the outer periphery, and the girder part 2, FIG. 10 shows the part and the outer periphery which connect all the girder parts 2 located in the outer periphery. An example is shown in which the bending strength reinforcing portion 5 is a square-shaped portion so that a part of the positioned girder portion 2 is continuous.

また、図１１には４方差しパレット４において、四隅の桁部２と中央の桁部２とをそれぞれ繋ぐ部位に曲げ強度補強部５を設けた例を示している。 FIG. 11 shows an example in which a bending strength reinforcing portion 5 is provided in each of the four-way pallet 4 where the four corner spar 2 and the center spar 2 are connected.

また、図１２には４方差しパレット４において、左右における縦方向の中間の桁部２と中央の桁部２を繋ぐ部位、及び、前後における横方向の中間の桁部２と中央の桁部２を繋ぐ部位にそれぞれ曲げ強度補強部５を設けた例が示してある。 Further, in FIG. 12 , in the four-way pallet 4, a portion connecting the vertical middle girder portion 2 and the central girder portion 2 on the left and right sides, and the horizontal middle girder portion 2 and the middle girder portion on the front and rear sides. The example which provided the bending strength reinforcement part 5 in the site | part which connects 2 is shown.

また、図１３には４方差しパレット４において、左右における縦方向の中間の桁部２と中央の桁部２を繋ぐ部位、及び、前後における横方向の中間の桁部２と中央の桁部２を繋ぐ部位にそれぞれ曲げ強度補強部５を設けると共に、中央の桁部２部分にも上記曲げ強度補強部５と連続するように曲げ強度補強部５を一体に設けた例が示してある。 Further, in FIG. 13 , in the four-way pallet 4, the part connecting the vertical middle girder part 2 and the central girder part 2 in the left and right, and the middle middle girder part 2 and the middle girder part in the front and rear direction. 2 shows an example in which a bending strength reinforcing portion 5 is provided at each of the two connecting portions 2 and a bending strength reinforcing portion 5 is integrally provided so as to be continuous with the bending strength reinforcing portion 5 at the central girder portion 2 .

また、他の成形材料と曲げ強度補強部５の境界線を、直線の組み合わせの凹凸や曲線の組み合わせの波状や直線と曲線の組み合わせとしてもよい。   Further, the boundary line between the other molding material and the bending strength reinforcing portion 5 may be a wavy shape of a combination of straight lines or a combination of curves, or a combination of straight lines and curves.

更に、金型の形状に左右されず、曲げ強度の強い成形材料を垂れ流すようにして成形することも可能である。   Furthermore, it is also possible to mold by casting a molding material having high bending strength regardless of the shape of the mold.

上記図１乃至図１３の各実施形態に示すように、曲げ強度の強い成形材料で成形した曲げ強度補強部５の端部はいずれも、パレット４の最外周端よりパレット４の内側方向に引き込んだ位置となっており、パレット４の最外周端は曲げ強度の強い成形材料では成形してなく、他の成形材料（曲げ強度補強部５以外の部位を成形する通常のパレット成形材料）により成形してある。つまり、本発明において最外周端に曲げ強度の強い成形材料を用いて桁間の曲げ強度を向上させることもできるが、曲げ強度の強い材料は曲げ強度は強いが耐衝撃性に劣るため、曲げ強度補強部５の端部がパレット４の最外周端まで至っていると、パレット４の最外周端にフォークの先端が衝突したり、パレット４が落下してパレット４の最外周端に衝撃が加わったりした場合、曲げ強度補強部５の端部がパレット４の最外周端まで至った部分が破損し易いという問題がある。よって、上記のように、パレット４の最外周端は曲げ強度の強い成形材料では成形してなく、曲げ強度補強部５以外の部位を成形する成形材料で成形することで、曲げ強度が向上したパレット４であると共に、耐衝撃の低下を防止できて、衝撃により破損し難いパレット４を提供できることになる。また、パレット４のフォーク挿入部３の湾曲部も、曲げ強度の強い成形材料では成形してなく、他の成形材料により成形することによって、フォークの先端が衝突しても破損し難いものである。 As shown in the above-described embodiments of FIGS. 1 to 13 , the end portions of the bending strength reinforcing portion 5 formed of a molding material having high bending strength are all drawn inward from the outermost peripheral end of the pallet 4 toward the inside of the pallet 4. The outermost peripheral edge of the pallet 4 is not molded with a molding material with high bending strength, but is molded with another molding material (a normal pallet molding material that molds a part other than the bending strength reinforcing portion 5). It is. That is, in the present invention, it is possible to improve the bending strength between girders by using a molding material having a high bending strength at the outermost peripheral end, but a material having a high bending strength has a high bending strength but is inferior in impact resistance. When the end of the strength reinforcing portion 5 reaches the outermost peripheral end of the pallet 4, the tip of the fork collides with the outermost peripheral end of the pallet 4 or the pallet 4 falls and an impact is applied to the outermost peripheral end of the pallet 4. In such a case, there is a problem that the portion where the end of the bending strength reinforcing portion 5 reaches the outermost peripheral end of the pallet 4 is easily damaged. Therefore, as described above, the outermost peripheral end of the pallet 4 is not molded with a molding material having a high bending strength, and the bending strength is improved by molding with a molding material that molds a portion other than the bending strength reinforcing portion 5. In addition to the pallet 4, it is possible to provide a pallet 4 that can prevent a decrease in impact resistance and is not easily damaged by the impact. In addition, the bending portion of the fork insertion portion 3 of the pallet 4 is not formed with a molding material having a high bending strength, and is not easily damaged even when the tip of the fork collides by being formed with another molding material. .

更に、パレット４の一部を持ち上げて引きずりながら移動しても、削れて塵が発生し難いものである。   Further, even if a part of the pallet 4 is lifted and dragged and moved, it is less likely to be scraped and generate dust.

また、上記各実施形態において、桁部２間を繋ぐ部位に、他の部位を成形する成形材料よりも曲げ強度の強い成形材料で成形した曲げ強度補強部５を設けるに当たり、桁部２間を繋ぐ曲げ強度補強部５は、桁部２の一部を含ませて一体に成形してもよい。このように桁部２の一部２ｃを桁部２間を繋ぐ部位と一体に曲げ強度の強い材料で成形して曲げ強度補強部５を形成してあることで、高価な曲げ強度の強い成形材料の使用量をできるだけ少なくしながら曲げ強度補強部５の曲げ強度を向上させることができる。   Moreover, in each said embodiment, in providing the bending strength reinforcement part 5 shape | molded with the molding material whose bending strength is stronger than the molding material which shape | molds another part in the site | part which connects between the beam parts 2, between the beam parts 2 is provided. The bending strength reinforcing part 5 to be joined may include a part of the girder part 2 and be integrally formed. As described above, the bending strength reinforcing portion 5 is formed by molding a part 2c of the spar 2 with a material having a high bending strength integrally with a portion connecting the spar 2 to each other, thereby forming an expensive high bending strength. The bending strength of the bending strength reinforcing portion 5 can be improved while reducing the amount of material used as much as possible.

ここで、図５の実施形態のように、桁部２における桁部２間を繋ぐ部位に隣接した部位の上下全長で且つ全厚みを曲げ強度の強い成形材料により成形して曲げ強度補強部５を形成してもよい。   Here, as in the embodiment of FIG. 5, the bending strength reinforcing portion 5 is formed by molding the entire thickness of the portion adjacent to the portion connecting the spar 2 in the spar 2 with the entire thickness of the slab by a molding material having a high bending strength. May be formed.

また、図１４（ａ）、（ｂ）の実施形態のように、桁部２における桁部２間を繋ぐ部位に隣接した部位の上下全長で且つ厚み巾の略半分厚を曲げ強度の強い成形材料により成形して曲げ強度補強部５を形成してもよい。この形状の上半体４ａと、下半体４ｂとを溶着すると、フォーク挿入部３を囲むようにロ字状になり、より一層曲げ強度が向上する。 Further, as in the embodiment of FIGS. 14 (a) and 14 (b), the upper and lower overall length of the portion adjacent to the portion connecting the spar 2 in the spar 2 and approximately half the thickness are formed with strong bending strength. The bending strength reinforcing portion 5 may be formed by molding with a material. When the upper half 4a and the lower half 4b of this shape are welded, a round shape is formed so as to surround the fork insertion portion 3, and the bending strength is further improved.

また、図１４（ｃ）に示す実施形態のように、桁部２における桁部２間を繋ぐ部位に隣接した部位の補強リブ６の上下高さに対応した部位（つまり桁部２の上下長さの略半分）で且つ全厚み巾を曲げ強度の強い成形材料により成形して曲げ強度補強部５を形成してもよい。 Further, as in the embodiment shown in FIG. 14 (c) , the portion corresponding to the vertical height of the reinforcing rib 6 in the portion adjacent to the portion connecting the spar 2 in the spar 2 (that is, the vertical length of the spar 2). The bending strength reinforcing portion 5 may be formed by molding the entire thickness width with a molding material having a high bending strength.

また、図１４（ｃ）に示す実施形態の上半体４ａと、下半体４ｂとを溶着すると、タルク入り等の曲げ強度に強い成形材料とは異なる他の成形材料同士が溶着されることになり、溶着強度が劣ることはない。 Further, when the upper half 4a and the lower half 4b of the embodiment shown in FIG. 14 (c) are welded, other molding materials different from the molding material having strong bending strength such as talc are welded together. The welding strength is not inferior.

更に、上記各実施形態では、桁部２間を繋ぐ部位に曲げ強度の強い成形材料で成形した曲げ強度補強部５を設けるに当たって、該当する部位の補強リブ６に加え該当する部位のデッキ部１の全厚み巾を曲げ強度の強い成形材料で成形して曲げ強度補強部５を設けた例を示したが、図１４（ｂ）に示すように該当する部位の補強リブ６に加え該当する部位のデッキ部１の厚み巾の裏面側の略半分を曲げ強度の強い成形材料で成形して曲げ強度補強部５を設けてもよい。このように、該当するデッキ部１の裏面側の略半分を曲げ強度の強い成形材料で成形することで、デッキ部１の表面に曲げ強度の強い成形材料が露出せず、したがって、デッキ部１の表面に衝撃が加わっても、破損しないようにできる。また、自動倉庫のチェーンコンベア等の搬送装置でパレット４を搬送しても、パレット４が削れて塵の発生に繋がらないことや、パレット４の一部を持ち上げて引きずりながら移動しても、削れて塵が発生し難いものである。ここで、図示を省略しているが、図５、図１４（ａ）（ｃ）の各実施形態等においてもデッキ部１においてはデッキ部１の厚み巾の裏面側の略半分を曲げ強度の強い成形材で成形するようにしてもよい。 Further, in each of the above-described embodiments, when the bending strength reinforcing portion 5 formed of a molding material having a high bending strength is provided at a portion connecting the beam portions 2, the deck portion 1 of the corresponding portion in addition to the reinforcing rib 6 of the corresponding portion. Although the example which provided the bending strength reinforcement part 5 by shape | molding the whole thickness width of this with the molding material with strong bending strength was shown, in addition to the reinforcement rib 6 of an applicable part as shown in FIG.14 (b) , applicable site | part The bending strength reinforcing portion 5 may be provided by molding substantially half of the thickness width of the deck portion 1 on the back side with a molding material having high bending strength. In this way, by molding substantially half of the back side of the corresponding deck portion 1 with a molding material having a high bending strength, the molding material having a high bending strength is not exposed on the surface of the deck portion 1. Even if an impact is applied to the surface, it can be prevented from being damaged. In addition, even if the pallet 4 is transported by a transport device such as a chain conveyor in an automatic warehouse, the pallet 4 is shaved and does not cause dust generation, or even if a part of the pallet 4 is lifted and dragged and moved. It is hard to generate dust. Here, although not shown in the drawings, in each of the embodiments of FIGS . 5, 14 (a) and 14 (c) , in the deck portion 1, substantially half of the thickness width of the deck portion 1 on the back side is bent. You may make it shape | mold with a strong molding material.

また、曲げ強度に強い成形材料が桁部２及び一部の桁部２を含む図１４（ａ）（ｂ）（ｃ）の各実施形態は、パレット４上面からの荷重によって、補強リブが下方に変形する基点の桁部２と補強リブ６の連結部分に、曲げ強度に強い成形材料が成形されているので、より一層曲げ強度が向上する。なお、一箇所の曲げ強度補強部５に図１４（ａ）（ｂ）（ｃ）を組み合わせてもよい。 14 (a), 14 (b), and 14 (c) , in which the molding material having a strong bending strength includes the spar 2 and a part of the spar 2, the reinforcing ribs are lowered by the load from the upper surface of the pallet 4. Since a molding material having a high bending strength is formed at the connecting portion between the base portion girder 2 and the reinforcing rib 6 which are deformed into a bending strength, the bending strength is further improved. In addition, you may combine FIG.14 (a) (b) (c) with the bending strength reinforcement part 5 of one place.

桁部２間を繋ぐ部位に曲げ強度の強い成形材料で成形した曲げ強度補強部５を設けるに当たっては、二色成形、サンドイッチ成形、インサート成形等種々の成形方法により成形することができる。   In providing the bending strength reinforcing portion 5 formed of a molding material having a high bending strength at a portion connecting between the girder portions 2, it can be formed by various molding methods such as two-color molding, sandwich molding, and insert molding.

また、曲げ強度の強い成形材料と、他の部位を成形する成形材料との色は同じ色であってもよく、異なる色であってもよい。   The color of the molding material having high bending strength and the molding material for molding other parts may be the same color or different colors.

図１５、図１６には桁部２間を繋ぐ部位に曲げ強度の強い成形材料で成形した曲げ強度補強部５を設けるための金型装置１０の一実施形態が示してある。 FIG. 15 and FIG. 16 show an embodiment of a mold apparatus 10 for providing a bending strength reinforcing portion 5 formed of a molding material having a high bending strength at a portion connecting between the girder portions 2.

金型装置１０は、固定金型１１と、固定金型１１に対して移動自在な可動金型１２と、固定金型１１又は可動金型１２に移動に設けたリングコア１３により構成してある。 The mold apparatus 10 includes a stationary mold 11, a movable movable die 12 relative to the stationary mold 11, are constituted by a ring core 13 which is provided to move the stationary mold 11 or movable mold 12.

図１５の実施形態では固定金型１１に凹部１４を設け、凹部１４にリングコア１３を移動自在に嵌め込んだ例を示している。可動金型１２を固定金型１１側に移動して型締めすることで可動金型１２と固定金型１１との対向面にキャビティ１５が形成される。リングコア１３の先端部にはリング状をした凸部１７が設けてあり、図１６（ａ）のようにリングコア１３を前進させて凸部１７を可動金型１２に当接してリング状の凸部１７によりキャビティ１５の一部（桁部２間を繋ぐ部位の一部）を囲った状態で、図１６（ｂ）のようにキャビティ１５の凸部１７により囲われている部分以外の部分に一次成形材料である成形材料２０を射出する一次射出を行なう。この一次射出終了後に、図１６（ｃ）のように、リングコア１３を後退させて凸部１７の先端面でキャビティ１５の内面の一部を構成させて上記一次射出により射出した成形材料２０の側端面を凸部１７により囲っていたキャビティ１５の未充填部分とを連通させ、次に、このキャビティ１５の未充填部分に図１６（ｄ）のように上記成形材料２０よりも曲げ強度の強い二次成形材料である成形材料２１を射出して図１７に示すように桁部２間を繋ぐ部位に曲げ強度補強部５を成形する。 In the embodiment of FIG. 15 , an example is shown in which a recess 14 is provided in the fixed mold 11 and a ring core 13 is movably fitted in the recess 14. A cavity 15 is formed on the opposing surface of the movable mold 12 and the fixed mold 11 by moving the movable mold 12 toward the fixed mold 11 and clamping the mold. A ring-shaped convex portion 17 is provided at the tip of the ring core 13, and as shown in FIG. 16A , the ring core 13 is advanced to bring the convex portion 17 into contact with the movable mold 12, thereby making the ring-shaped convex portion. In a state where a part of the cavity 15 is enclosed by the part 17 ( a part of the part connecting the beam portions 2), a primary part is formed on a part other than the part surrounded by the convex part 17 of the cavity 15 as shown in FIG. Primary injection for injecting the molding material 20 which is a molding material is performed. After the completion of the primary injection, as shown in FIG. 16C , the ring core 13 is retracted so that the tip surface of the convex portion 17 forms a part of the inner surface of the cavity 15, and the molding material 20 injected by the primary injection side. The end surface of the cavity 15 surrounded by the convex portion 17 is communicated with the unfilled portion of the cavity 15, and then the unfilled portion of the cavity 15 has a bending strength higher than that of the molding material 20 as shown in FIG. The molding material 21 which is the next molding material is injected, and the bending strength reinforcing portion 5 is molded at a portion connecting the beam portions 2 as shown in FIG .

本発明のパレットの一実施形態の斜視図である。It is a perspective view of one embodiment of the pallet of the present invention. 同上の平面図である。It is a top view same as the above. 同上の図２のＸ−Ｘ線の断面図である。It is sectional drawing of the XX line of FIG. 2 same as the above. 同上の図３のＹ１−Ｙ１線又はＹ２−Ｙ２線の断面図である。It is a cross-sectional view of a Y 1 -Y 1-wire or Y 2 -Y 2 line in FIG. 3; FIG. 同上の曲げ強度補強部と桁部との関係を示す拡大断面図である。It is an expanded sectional view which shows the relationship between a bending strength reinforcement part same as the above and a girder part. 本発明の他の実施例を示し、該他の実施例を図２のＹ１−Ｙ１線又はＹ２−Ｙ２線に対応した部分で切断した断面図である。It shows another embodiment of the present invention, is a cross-sectional view taken along a portion corresponding to the another embodiment the Y 1 -Y 1-wire or Y 2 -Y 2 line in FIG. 本発明の更に他の実施例を示し、該更に他の実施例を図２のＹ１−Ｙ１線又はＹ２−Ｙ２線に対応した部分で切断した断面図である。FIG. 5 is a cross-sectional view showing still another embodiment of the present invention, which is cut at a portion corresponding to the Y 1 -Y 1 line or the Y 2 -Y 2 line of FIG. 本発明の更に他の実施例を示し、該更に他の実施例を図２のＹ１−Ｙ１線又はＹ２−Ｙ２線に対応した部分で切断した断面図である。FIG. 5 is a cross-sectional view showing still another embodiment of the present invention, which is cut at a portion corresponding to the Y 1 -Y 1 line or the Y 2 -Y 2 line of FIG. 本発明の更に他の実施例を示し、該更に他の実施例を図２のＹ１−Ｙ１線又はＹ２−Ｙ２線に対応した部分で切断した断面図である。FIG. 5 is a cross-sectional view showing still another embodiment of the present invention, which is cut at a portion corresponding to the Y 1 -Y 1 line or the Y 2 -Y 2 line of FIG. 本発明の更に他の実施例を示し、該更に他の実施例を図２のＹ１−Ｙ１線又はＹ２−Ｙ２線に対応した部分で切断した断面図である。FIG. 5 is a cross-sectional view showing still another embodiment of the present invention, which is cut at a portion corresponding to the Y 1 -Y 1 line or the Y 2 -Y 2 line of FIG. 本発明の更に他の実施例を示し、該更に他の実施例を図２のＹ１−Ｙ１線又はＹ２−Ｙ２線に対応した部分で切断した断面図である。FIG. 5 is a cross-sectional view showing still another embodiment of the present invention, which is cut at a portion corresponding to the Y 1 -Y 1 line or the Y 2 -Y 2 line of FIG. 本発明の更に他の実施例を示し、該更に他の実施例を図２のＹ１−Ｙ１線又はＹ２−Ｙ２線に対応した部分で切断した断面図である。FIG. 5 is a cross-sectional view showing still another embodiment of the present invention, which is cut at a portion corresponding to the Y 1 -Y 1 line or the Y 2 -Y 2 line of FIG. 本発明の更に他の実施例を示し、該更に他の実施例を図２のＹ１−Ｙ１線又はＹ２−Ｙ２線に対応した部分で切断した断面図である。FIG. 5 is a cross-sectional view showing still another embodiment of the present invention, which is cut at a portion corresponding to the Y 1 -Y 1 line or the Y 2 -Y 2 line of FIG. （ａ）（ｂ）（ｃ）はそれぞれ本発明の他の実施形態における曲げ強度補強部と桁部との関係を示す拡大断面図である。(A) (b) (c) is an expanded sectional view which shows the relationship between the bending strength reinforcement part and girder part in other embodiment of this invention, respectively. 本発明のパレットを製造するための金型装置の一例を示す要部断面図である。It is principal part sectional drawing which shows an example of the metal mold | die apparatus for manufacturing the pallet of this invention. （ａ）（ｂ）（ｃ）（ｄ）は同上の金型装置を用いた成形順序を示す説明図である。(A) (b) (c) (d) is explanatory drawing which shows the shaping | molding order using the mold apparatus same as the above. 同上の曲げ強度補強部を設けた位置の一例を示す説明図である。It is explanatory drawing which shows an example of the position which provided the bending strength reinforcement part same as the above.

１ デッキ部
２ 桁部
３ フォーク挿入部
４ パレット
５ 曲げ強度補強部 1 Deck part 2 Girder part 3 Fork insertion part 4 Pallet 5 Bending strength reinforcement part

Claims (1)

載置物を載置するためのデッキ部と、四隅、及び、中央、及び、４辺における各辺の中間にそれぞれ桁部とを備え、桁部間がフォーク挿入部となった４方差しの合成樹脂製のパレットにおいて、該パレットの四隅の各桁部と隣接する中間の桁部との間を繋ぐ部位、又は、中央の桁部と隣接する４つの中間の桁部との間を繋ぐ部位、又は、中央の桁部と四隅の桁部とを繋ぐ部位に、デッキ部の裏面の桁部間に架け渡される複数の補強リブが設けられ、この四隅の各桁部と隣接する中間の桁部との間を繋ぐ部位、又は、中央の桁部と隣接する４つの中間の桁部との間を繋ぐ部位、又は、中央の桁部と四隅の桁部とを繋ぐ部位において、上記補強リブの一部とデッキ部の一部と筒状をした桁部の一部を一体化して、この一体化した上記補強リブの一部とデッキ部の一部と筒状をした桁部の一部が、他の部位を成形する成形材料よりも曲げ強度の強い補強材が添加された成形材料を用いた二色成形又はサンドイッチ成形又はインサート成形により一体に成形されて曲げ強度補強部となり、上記曲げ強度補強部の端部がパレットの最外周端よりパレットの内側方向に引き込んだ位置であることを特徴とする合成樹脂製パレット。 A four-way composite with a deck for placing objects, four corners, a center, and a girder in the middle of each of the four sides, and a fork insertion section between the girder. In a resin pallet, a part connecting between each of the four corners of the pallet and the adjacent intermediate part, or a part connecting between the central part and four adjacent intermediate parts, Alternatively, a plurality of reinforcing ribs are provided between the central girder part and the four corner girder parts, and are provided between the girder parts on the back surface of the deck part. Of the reinforcing rib, or a part connecting between the central spar and the four intermediate spars adjacent to the central spar or a part connecting the central spar and the four corners. A part of the reinforcing rib is integrated with a part of the deck part and a part of the cylindrical girder part. A part of the column portions in which the partially cylindrical deck section, two-color molding or sandwich molding or using a molding material strong reinforcement flexural strength than the molding material is added for molding the other part A synthetic resin pallet characterized in that it is integrally formed by insert molding to form a bending strength reinforcing portion, and an end of the bending strength reinforcing portion is a position drawn inward from the outermost peripheral end of the pallet.
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