WO2003002420A1 - Palette de resine synthetique - Google Patents
Palette de resine synthetique Download PDFInfo
- Publication number
- WO2003002420A1 WO2003002420A1 PCT/JP2002/006215 JP0206215W WO03002420A1 WO 2003002420 A1 WO2003002420 A1 WO 2003002420A1 JP 0206215 W JP0206215 W JP 0206215W WO 03002420 A1 WO03002420 A1 WO 03002420A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- girder
- deck board
- layer
- corners
- core layer
- Prior art date
Links
- 229920003002 synthetic resin Polymers 0.000 title claims abstract description 47
- 239000000057 synthetic resin Substances 0.000 title claims abstract description 47
- 239000010410 layer Substances 0.000 claims abstract description 126
- 239000012792 core layer Substances 0.000 claims abstract description 85
- 229920005989 resin Polymers 0.000 claims abstract description 68
- 239000011347 resin Substances 0.000 claims abstract description 68
- 239000000463 material Substances 0.000 claims abstract description 60
- 239000004033 plastic Substances 0.000 claims abstract description 38
- 229920003023 plastic Polymers 0.000 claims abstract description 38
- 238000000034 method Methods 0.000 claims abstract description 15
- 239000002344 surface layer Substances 0.000 claims description 29
- 230000002093 peripheral effect Effects 0.000 claims description 23
- 229920005672 polyolefin resin Polymers 0.000 claims description 12
- 238000005187 foaming Methods 0.000 claims description 9
- 239000006260 foam Substances 0.000 claims description 7
- 239000011800 void material Substances 0.000 claims description 2
- 239000011796 hollow space material Substances 0.000 claims 2
- 238000000465 moulding Methods 0.000 abstract description 10
- 238000002347 injection Methods 0.000 abstract description 4
- 239000007924 injection Substances 0.000 abstract description 4
- 239000002184 metal Substances 0.000 abstract 1
- 230000001172 regenerating effect Effects 0.000 abstract 1
- 230000003014 reinforcing effect Effects 0.000 description 19
- 239000003086 colorant Substances 0.000 description 5
- 239000000049 pigment Substances 0.000 description 4
- 238000001746 injection moulding Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 235000013405 beer Nutrition 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000011231 conductive filler Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000003039 volatile agent Substances 0.000 description 1
- 239000004636 vulcanized rubber Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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- B65D2519/0086—Protection against environmental hazards, e.g. humidity, bacteria, fire
Definitions
- the present invention relates to a pallet made of synthetic resin for forklifts used for storing and transporting luggage, and more specifically, a synthetic resin having at least a part of a pallet having a two-layer structure of a surface layer and an inner layer.
- synthetic resin pallets are large-sized injection-molded products, the molding conditions such as mold split surfaces, runners, and gates have a greater effect on the dimensional accuracy, strength, etc. of products than general resin molded products give.
- synthetic resin pallets are large injection molded products, such as 100 mm x 100 mm and 1100 mm x 200 mm. Injection molding.
- the reason for using a multi-point gate system with a large number of gates is to ensure the fluidity of the resin during injection molding and complete filling and solidification in a short time to increase productivity.
- Another reason for using the multi-point gate method is that when the pallet is a molded resin foam, the difference in foam density between parts increases as the distance of resin flow from the gate increases. . Therefore, the distance of resin flow is reduced by adopting the multi-point gate method.
- conventional plastic pallets are already molded by recycling recycled plastics to reduce costs.
- Conventional recycled plastic is used by mixing a certain percentage of recycled plastic with virgin material.
- the conventional molding method uses a multi-point gate method, and increasing the number of gates increases the occurrence of welds.
- weld section when the resin flow separates and meets again, the tip of the flowing resin cools and oxidizes. Because of this, streaks may occur due to the inability to completely merge, and air and resin volatiles in the cavity may prevent merging, and are found in most injection molded products.
- the synthetic resin pallet according to the present invention is a synthetic resin pallet including a deck board and a girder, and at least a part thereof includes a skin layer that is a surface layer and a core layer that is an inner layer. It is characterized by being molded into a layer structure.
- the synthetic resin pallet according to the present invention is a multi-layer injection-molded product in which a resin of a skin layer serving as a surface layer is injected into a mold cavity, and then a resin of a core layer serving as an inner layer is injected and molded. It can be molded by a molding method.
- the core layer may be 10 to 70% by weight of the whole.
- a synthetic resin pallet connects the upper deck board and the lower deck board via a girder, and the girder is at four corners of the deck board, an intermediate part thereof, and This is a so-called four-sided pallet that is located almost in the center.
- the girder has a hollow structure having a void therein, and at least a peripheral wall of the girder and ribs connecting the corners of the girder to the corners of the girder are composed of a skin layer as a surface layer and a core layer as an inner layer. It is preferable to mold into a layer structure.
- a one-point gate system in which a gate is provided at a point substantially at the center of the deck board.
- the resin flows as a whole at almost the same speed, and the gas in the mold is uniformly discharged from the entire mold, thereby preventing the occurrence of ⁇ eld.
- a circular rib is provided on the lower surface substantially at the center of the top plate where the gate portion is located, and the thickness of the top plate in the range of the circular rib is formed to be thicker than other portions. Is preferred. By making the periphery of the gate thick, the flow of resin becomes smoother.
- the skin layer may be formed of a polyolefin resin material
- the core layer may be formed of a resin material compatible with a polyolefin resin.
- the core layer may be formed of a recycled plastic material. By using a recycled plastic material for the core layer, the cost can be reduced without changing the image color. Polyolefin resin can be used as the recycled plastic material.
- the core layer is formed of a polyolefin resin material having a flexural modulus of 1 OOOMPa to 50OOMPa.
- a polyolefin resin material having a flexural modulus of 1 OOOMPa to 50OOMPa.
- the skin layer is molded of a non-foamed resin material
- the core layer is formed of a foamed resin material having an expansion ratio of 1.05 to 1.5.
- the skin layer can be molded from a conductive resin material.
- the skin layer is molded from a conductive and weather-resistant resin material, and the core layer is formed from a conductive and weather-resistant resin. You may shape
- FIG. 1 is a front view showing an example of a pallet according to the present invention.
- FIG. 2 is a plan view of the right half of the pallet, a left half is a cross-sectional view taken along line AA of FIG. 3 is a cross-sectional view taken along the line BB in FIG. 2,
- FIG. 4 is a cross-sectional view taken along the line CC in FIG. 2, and
- the synthetic resin pallet 10 is a square pallet.
- the synthetic resin pallet 10 is formed by welding two parts, an upper molded member 11 and a lower molded member 13 which have been separately molded in advance.
- the upper molded member 11 comprises an upper deck board 15 and girders 17a to 17c.
- the lower molded member 13 comprises a lower deck board 19 and girders 20a to 20c. It is formed by abutting and welding the end faces of 17 and 20.
- the beams 17 a to l 7 c and the beams 20 a to 20 c are hollow structures, and the beams 17 a and 20 a at the four corners of the deck board and the beams 17 b at the intermediate portion thereof are respectively provided. , 20b and the central digits 17c, 20c located at the diagonal intersection.
- a space surrounded by the girders 17a to 17b, girders 20a to 20b, the upper deck board 15 and the lower deck board 19 is defined as a fork insertion port 21.
- a polyolefin resin such as polyethylene or polypropylene can be used. If necessary, a foaming agent, a conductive filler, glass fiber, a weather-resistant chemical, a pigment, etc. Add 2 or more May be.
- the lower deck board 19 may have the same configuration as the upper deck board 15, but a portion inscribed in the inside tip of the girder may be an opening surface. Therefore, the structure of this pallet described below may be at least provided on the upper deck board 15.
- the upper deck board 15 includes a top plate 23 and reinforcing ribs 25 provided vertically and horizontally on the lower surface of the top plate 23, and the overall height is determined by the height dimension of the reinforcing ribs 25.
- a through hole 27 is formed at an appropriate position of the top plate 23 in a portion surrounded by the reinforcing rib 25.
- the reinforcing ribs 25a, 25b, and the intermediate girders 17b connecting the corners of the four corners 1 ⁇ a and the corners of the intermediate girder 17b are connected.
- the reinforcing ribs 25c connecting the corners of the spar and the center spar 17c, and the stiffening ribs 25d provided almost at the center between the spar, are relatively smaller than the other stiffening ribs. The thickness is formed thicker.
- the gate portion 30 is provided substantially at the center of the top plate 23, and a circular rib 31 is provided on the lower surface of the top plate 23 opposite to the gate portion 30. From the circular rib 31, a reinforcing rib 33 is provided to be connected to the corner of the central beam 17 c.
- the reinforcing ribs 33 improve the flow of the resin during injection molding, and also function as runner ribs for flowing the resin smoothly.
- the formation of the circular ribs 31 is for preventing the reinforcing ribs 33 from directly intersecting with each other, since the intersecting portion becomes a thick portion, which takes a long cooling time and uneven shrinkage.
- the thickness N of the top plate 23a in the circular rib 31 is formed to be larger than the thickness N1 of the other portions of the top plate.
- the flow resistance of the resin can be reduced in combination with the provision of the reinforcing ribs 33.
- FIG. 3 and FIG. 4 are enlarged views in which a main part is sectioned.
- the top plate 23 and the reinforcing ribs 25 have a two-layer structure of a skin layer S as a surface layer and a core layer K as an inner layer, and are formed of two types of resins.
- the resin that forms the skin layer S is first injected into the mold, and then the resin that forms the core layer K is injected into the mold with a slight delay.
- a two-layer structure covered with the skin layer S is formed.
- the resin that forms the skin layer S When the resin that forms the skin layer S is injected, and then the resin that forms the core layer K is injected, the resin that forms the skin layer solidifies on the walls of the mold cavity while flowing in two layers. However, the resin forming the core layer K is confined to form the core layer. In order to solve the problem of the core layer protruding into the skin layer and mixing of the core layer and the skin layer, the resin injected from the gate part must be filled with the resin of the core layer K just before it hits the tip of the cavity. Adjust the amount of resin, molding conditions, etc. so that injection is completed.
- the two-layer structure composed of the skin layer S and the core layer K is desirably formed on the entire pallet, but the skin layer S is solidified before the core layer K is filled in a thin portion or the like. Therefore, it is difficult to form a core layer.
- the reinforcing ribs 25a, 25b, the reinforcing ribs 25c, and the reinforcing ribs 25d are formed to be relatively thicker than other reinforcing ribs. Therefore, a two-layer structure composed of the skin layer S and the core layer K is formed.
- the core layer K may be set to 10 to 40% by weight, although it depends on the structure and size of the reinforcing rib. If the amount of the core layer is less than 10% by weight, the cost cannot be reduced by the two-layer structure. If the content is more than 70% by weight, the skin layer is broken and the core layer is exposed, or the skin layer and the core layer are mixed at the eld portion. There is a risk of slipping.
- the material used for the core layer K is not particularly limited, and may be any resin that is compatible with the skin layer. For example, various recycled plastic materials of polyolefin resin can be used.
- the foaming resin may be a non-foaming resin, but it is preferable that the foaming ratio is 1.05 to 1.5 in order to use the foaming resin.
- the core layer K is made of a material having a high flexural modulus, for example, a polyolefin resin material having a flexural modulus of 100 MPa to 500 MPa, thereby providing a light and high flexural strength.
- High pallets can be manufactured. Since the core layer K is covered in a sandwich shape by the skin layer S, a recycled plastic material can be used for the core layer K.
- Recycled plastic materials can be injection-moldable resins, such as those mixed with printing ink, vulcanized rubber powder, wood powder, paper powder, other fibers, or resin containing filler such as calcium carbonate. There may be.
- the skin layer S a resin having conductivity or a resin having weather resistance as well as conductivity can be used.
- the skin layer S may be a foamed resin if it is a non-foamed resin.
- the surface can be smoothed, and the pallet can be made hard to be stained. Even if it becomes dirty, the stain can be easily removed.
- the weather resistance of only the skin layer can be improved, or by using a desired color, the amount of weather-resistant chemicals, pigments, and the like can be reduced. Cost can be reduced o
- the reinforcing ribs provided on the lower surface of the top plate 23 are not limited to lattice-shaped ribs parallel to the end faces of the pallet, but may be ribs provided obliquely on the end faces of the pallets. It may be. Also, in order to improve the flow of resin from the central gate 30 to the four corners 1 ⁇ a, the gate 30 and the A runner rib connecting the 17a may be provided. Further, in the above embodiment, the four-sided pallet has been described. However, the present invention is not limited to the four-sided pallet, and a two-sided pallet can be appropriately applied.
- the synthetic resin pallet according to the present invention has an internal structure of a two-layer structure including a skin layer and a core layer, and therefore, an inexpensive recycled plastic material is used for the core layer. Therefore, if a material having aesthetics, conductivity, weather resistance, and the like is used for the skin layer, the cost can be reduced without deteriorating the performance of the synthetic resin pallet. Also, by using an image color material for the skin layer and using a recycled plastic material for the core layer, the image color can be maintained continuously. In addition, since recycled plastic material obtained by mixing and pulverizing waste products collected indiscriminately can be used for the core layer, recycled plastic material can be used effectively.
- the pallet has a two-layer structure consisting of a skin layer and a core layer
- the number of ellipses is only at the four corners of the deck board, and the amount of resin in the core layer is sufficient. Can be filled.
- the molten resin to be the skin layer and the molten resin to be the core layer flow in two layers at a uniform flow rate, it is a relatively thin portion. Also, a skin layer and a core layer can be formed.
- the pallet made of a synthetic resin according to the present invention is useful as a pallet using recycled plastic, particularly as a pallet that maintains the image color of the surface.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Pallets (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE50212845T DE50212845D1 (de) | 2001-06-27 | 2002-06-21 | Kunstharzpalette |
EP02743686A EP1422152B1 (de) | 2001-06-27 | 2002-06-21 | Kunstharzpalette |
KR1020037016602A KR100816177B1 (ko) | 2001-06-27 | 2002-06-21 | 합성수지제 팰릿 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001194638A JP4079344B2 (ja) | 2001-06-27 | 2001-06-27 | 合成樹脂製パレット |
JP2001-194638 | 2001-06-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003002420A1 true WO2003002420A1 (fr) | 2003-01-09 |
Family
ID=19032738
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/006215 WO2003002420A1 (fr) | 2001-06-27 | 2002-06-21 | Palette de resine synthetique |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1422152B1 (ja) |
JP (1) | JP4079344B2 (ja) |
KR (1) | KR100816177B1 (ja) |
DE (1) | DE50212845D1 (ja) |
WO (1) | WO2003002420A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007061321A1 (en) * | 2005-11-28 | 2007-05-31 | Algen Holdings Limited | Method of manufacturing a pallet |
CN102910343A (zh) * | 2012-11-06 | 2013-02-06 | 苏州金柏包装技术开发有限公司 | 一种复合加芯泡塑托盘及其生产工艺 |
Families Citing this family (18)
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---|---|---|---|---|
JP4177211B2 (ja) * | 2003-09-04 | 2008-11-05 | 積水化学工業株式会社 | サンドイッチ射出成形品 |
JP4936498B2 (ja) * | 2004-01-27 | 2012-05-23 | 株式会社明治ゴム化成 | プラスチック成型品の成形方法 |
DE202004005481U1 (de) * | 2004-04-02 | 2005-06-02 | Kuka Schweissanlagen Gmbh | Werkstückträger |
JP4746304B2 (ja) * | 2004-10-27 | 2011-08-10 | 積水テクノ成型株式会社 | 有底箱型容器およびその製造方法 |
JP4856443B2 (ja) * | 2006-02-22 | 2012-01-18 | 岐阜プラスチック工業株式会社 | 成形品の溶着方法及びパレットの溶着方法 |
KR100764611B1 (ko) * | 2006-05-18 | 2007-10-09 | 덕양산업 주식회사 | 미세발포 시트를 적용한 다층구조의 인스트루먼트 판넬 및 그 제조방법 |
DE202007003691U1 (de) | 2007-03-13 | 2007-07-05 | Paul Craemer Gmbh | Geschlossene Palette mit Fräslinie |
JP4972511B2 (ja) * | 2007-09-28 | 2012-07-11 | 三甲株式会社 | 合成樹脂製パレット用スキッド |
JP5118512B2 (ja) * | 2008-02-29 | 2013-01-16 | 岐阜プラスチック工業株式会社 | 合成樹脂製のパレット |
US8146516B2 (en) | 2008-03-28 | 2012-04-03 | Oria Collapsibles, Llc | Structural supporting substrate incorporated into a composite and load supporting platform |
CN102046481A (zh) | 2008-03-28 | 2011-05-04 | 欧瑞亚轴环有限责任公司 | 复合式可堆叠托盘装置 |
US8522694B2 (en) | 2008-06-20 | 2013-09-03 | Oria Collapsibles, Llc | Structural supporting pallet construction with improved perimeter impact absorbing capabilities |
US8167605B2 (en) | 2008-06-20 | 2012-05-01 | Oria Collapsibles, Llc | Production assembly and process for mass manufacture of a thermoplastic pallet incorporating a stiffened insert |
US8438981B2 (en) | 2008-06-20 | 2013-05-14 | Oria Collapsibles, Llc | Pallet design with buoyant characteristics |
US8418632B2 (en) | 2008-06-20 | 2013-04-16 | Oria Collapsibles, Llc | Pallet assembly with locating support structure |
US8701569B2 (en) | 2008-06-20 | 2014-04-22 | Oria Collapsibles, Llc | Pallet design with structural reinforcement |
JP2010047266A (ja) * | 2008-08-20 | 2010-03-04 | Dic Corp | 合成樹脂製パレット |
CH711309A1 (fr) * | 2015-07-13 | 2017-01-13 | Abi Trading Sàrl | Procédé de fabrication d'une palette en bois composite, dispositif pour la mise en œuvre du procédé et moule d'injection pour la réalisation de ladite palette. |
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JPS5233977A (en) * | 1975-09-10 | 1977-03-15 | Asahi Chem Ind Co Ltd | Pallets based on synthetic resins |
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US5453236A (en) * | 1994-02-08 | 1995-09-26 | Composite Design International, Inc. | Method of molding a load bearing pallet from recycled materials |
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- 2001-06-27 JP JP2001194638A patent/JP4079344B2/ja not_active Expired - Lifetime
-
2002
- 2002-06-21 KR KR1020037016602A patent/KR100816177B1/ko not_active IP Right Cessation
- 2002-06-21 EP EP02743686A patent/EP1422152B1/de not_active Expired - Lifetime
- 2002-06-21 DE DE50212845T patent/DE50212845D1/de not_active Expired - Lifetime
- 2002-06-21 WO PCT/JP2002/006215 patent/WO2003002420A1/ja active IP Right Grant
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JPS5233977A (en) * | 1975-09-10 | 1977-03-15 | Asahi Chem Ind Co Ltd | Pallets based on synthetic resins |
JPH05253934A (ja) * | 1992-03-13 | 1993-10-05 | B C Japan Kk | ファイバ内蔵樹脂成型品を用いた再生板 |
JPH09109340A (ja) * | 1995-10-13 | 1997-04-28 | Toppan Printing Co Ltd | 多層プラスチック容器 |
JPH10316134A (ja) * | 1997-05-19 | 1998-12-02 | Meiji Rubber & Chem Co Ltd | 合成樹脂製パレット |
JP2000203578A (ja) * | 1998-10-26 | 2000-07-25 | Nippon Plapallet Kk | 合成樹脂製パレット |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007061321A1 (en) * | 2005-11-28 | 2007-05-31 | Algen Holdings Limited | Method of manufacturing a pallet |
CN102910343A (zh) * | 2012-11-06 | 2013-02-06 | 苏州金柏包装技术开发有限公司 | 一种复合加芯泡塑托盘及其生产工艺 |
Also Published As
Publication number | Publication date |
---|---|
EP1422152A4 (de) | 2005-08-24 |
JP2003011969A (ja) | 2003-01-15 |
JP4079344B2 (ja) | 2008-04-23 |
KR20040015275A (ko) | 2004-02-18 |
DE50212845D1 (de) | 2008-11-13 |
EP1422152B1 (de) | 2008-10-01 |
EP1422152A1 (de) | 2004-05-26 |
KR100816177B1 (ko) | 2008-03-21 |
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