WO2014183233A1 - Procede pour fabriquer une palette en matiere plastique et palette en matiere plastique - Google Patents

Procede pour fabriquer une palette en matiere plastique et palette en matiere plastique Download PDF

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Publication number
WO2014183233A1
WO2014183233A1 PCT/CN2013/000602 CN2013000602W WO2014183233A1 WO 2014183233 A1 WO2014183233 A1 WO 2014183233A1 CN 2013000602 W CN2013000602 W CN 2013000602W WO 2014183233 A1 WO2014183233 A1 WO 2014183233A1
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WO
WIPO (PCT)
Prior art keywords
thermoplastic
plate
plastic
hollow
bonding
Prior art date
Application number
PCT/CN2013/000602
Other languages
English (en)
Chinese (zh)
Inventor
张岩
Original Assignee
Zhang Yan
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhang Yan filed Critical Zhang Yan
Publication of WO2014183233A1 publication Critical patent/WO2014183233A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D19/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
    • B65D19/0004—Rigid pallets without side walls
    • B65D19/0006—Rigid pallets without side walls the load supporting surface being made of a single element
    • B65D19/0008—Rigid pallets without side walls the load supporting surface being made of a single element forming a continuous plane contact surface
    • B65D19/002—Rigid pallets without side walls the load supporting surface being made of a single element forming a continuous plane contact surface the base surface being made of more than one element
    • B65D19/0024—Rigid pallets without side walls the load supporting surface being made of a single element forming a continuous plane contact surface the base surface being made of more than one element forming discontinuous or non-planar contact surfaces
    • B65D19/0026—Rigid pallets without side walls the load supporting surface being made of a single element forming a continuous plane contact surface the base surface being made of more than one element forming discontinuous or non-planar contact surfaces and each contact surface having a stringer-like shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
    • B65D2519/00004—Details relating to pallets
    • B65D2519/00009—Materials
    • B65D2519/00014—Materials for the load supporting surface
    • B65D2519/00034—Plastic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
    • B65D2519/00004—Details relating to pallets
    • B65D2519/00009—Materials
    • B65D2519/00049—Materials for the base surface
    • B65D2519/00069—Plastic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
    • B65D2519/00004—Details relating to pallets
    • B65D2519/00258—Overall construction
    • B65D2519/00263—Overall construction of the pallet
    • B65D2519/00273—Overall construction of the pallet made of more than one piece
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
    • B65D2519/00004—Details relating to pallets
    • B65D2519/00258—Overall construction
    • B65D2519/00283—Overall construction of the load supporting surface
    • B65D2519/00288—Overall construction of the load supporting surface made of one piece
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
    • B65D2519/00004—Details relating to pallets
    • B65D2519/00258—Overall construction
    • B65D2519/00313—Overall construction of the base surface
    • B65D2519/00323—Overall construction of the base surface made of more than one piece
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
    • B65D2519/00004—Details relating to pallets
    • B65D2519/00258—Overall construction
    • B65D2519/00313—Overall construction of the base surface
    • B65D2519/00328—Overall construction of the base surface shape of the contact surface of the base
    • B65D2519/00333—Overall construction of the base surface shape of the contact surface of the base contact surface having a stringer-like shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
    • B65D2519/00004—Details relating to pallets
    • B65D2519/00547—Connections
    • B65D2519/00552—Structures connecting the constitutive elements of the pallet to each other, i.e. load supporting surface, base surface and/or separate spacer
    • B65D2519/00557—Structures connecting the constitutive elements of the pallet to each other, i.e. load supporting surface, base surface and/or separate spacer without separate auxiliary elements
    • B65D2519/00562—Structures connecting the constitutive elements of the pallet to each other, i.e. load supporting surface, base surface and/or separate spacer without separate auxiliary elements chemical connection, e.g. glued, welded, sealed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
    • B65D2519/00004—Details relating to pallets
    • B65D2519/00547—Connections
    • B65D2519/00552—Structures connecting the constitutive elements of the pallet to each other, i.e. load supporting surface, base surface and/or separate spacer
    • B65D2519/00557—Structures connecting the constitutive elements of the pallet to each other, i.e. load supporting surface, base surface and/or separate spacer without separate auxiliary elements
    • B65D2519/00567—Structures connecting the constitutive elements of the pallet to each other, i.e. load supporting surface, base surface and/or separate spacer without separate auxiliary elements mechanical connection, e.g. snap-fitted

Definitions

  • the present invention relates to a method of making a plastic tray and a plastic tray. Halo technology
  • pallets are now widely used in production, transportation, warehousing and distribution, and are considered to be one of the two key innovations in the logistics industry in the 20th century.
  • pallets play a huge role in modern logistics with the use of forklifts.
  • the benefits that pallets bring to the modern logistics industry are mainly reflected in: Unitization, standardization and standardization of goods packaging, protection of goods, and convenience of logistics and business flow.
  • plastic pallets are made of thermoplastics such as polyethylene and polypropylene, plus some additives for improving performance, which are processed by injection molding, blow molding and the like.
  • plastic pallets Compared with wooden pallets, plastic pallets have good integrity, are hygienic and clean, easy to be washed and disinfected, and have the characteristics of light weight, no nails, acid and alkali resistance, mildew resistance, etc., and their service life is 5-7 of wooden pallets. Times.
  • plastic pallets meet environmental requirements and waste disc materials can be recycled.
  • Plastic pallets can be classified as follows according to their shape:
  • Double-sided plastic pallets including: flat-sided double-sided plastic pallets (can only be used for four-way mechanical forklifts), grid double-sided plastic pallets (can only be used for four-way mechanical forklifts);
  • plastic pallets have the following four molding methods: The first one: injection molding.
  • the plastic pallet products produced by injection molding are flat, smooth, stiff and compact, and have a wide degree of product design freedom. They are divided into double-sided integral plastic trays and double-sided assembled plastic trays.
  • the double-sided integral tray generally has a weight of more than 15 kg/block, and the shape is relatively complicated.
  • the extrusion-hollow blow molding of the plastic tray is similar to the general hollow product blow molding method. Because of its large size and double-sided type, a larger extruder, a mold clamping machine and a mold are required. At present, domestic hollow molding machine manufacturers have developed a large-scale hollow molding machine that specializes in high-speed production of high-strength blow molding trays. It is produced by HMWHDPE high-strength plastics, with high forming speed, good product quality, high strength, high rigidity and very long
  • the service life of the general blown tray can reach 5 ⁇ 10 years, and it can work stably in the environment of -40 ⁇ 40 °C.
  • the dynamic load of its products can reach more than 3t, and the flexural strength reaches a high level.
  • the third type vacuum forming method.
  • Plastic trays produced by vacuum forming are also available in single-sided and double-sided versions.
  • Single-sided blister trays are mostly used for packaging and transportation of small motors (such as vacuum cleaner motors, power tool motors, etc.) and wire trays. Recently, they have developed rapidly and are mainly used exclusively.
  • the double-sided blister trays are assembled in two forms: the upper half is an extruded fixed length, fixed width plastic sheet, and the lower half is a large vacuum blister; the upper and lower half are large vacuum blister product.
  • the method requires large-scale vacuum blistering equipment for production molding, and the equipment cost is low, and the mold cost is also low, but the product wall thickness is not uniform.
  • the plastic pallets produced by the method are assembled, that is, using an extruder, a machine head and the like, respectively, extruding the slats for the upper and lower plates and the I-shaped connecting plates with the compound wings for the connection support. Then assemble again.
  • wood-plastic composites has driven the development of plastic pallets for extrusion molding. It is based on natural plant fiber (including wood flour husk, straw powder, rice bran, etc.) and waste plastics.
  • the present invention provides a method for manufacturing a plastic tray, which can manufacture a plastic tray with a small self-weight and a large load, and is simple and compact, and can flexibly manufacture plastic trays of various specifications. .
  • the present invention provides the following technical solution - a method for manufacturing a plastic tray, comprising: bonding thermoplastic sheets to form individual beams or legs of a plastic tray, and forming thermoplastic sheets into plastic a flat plate of the tray; bonding the beam to the flat plate to form a plastic tray, or assembling the beam into a keel and then bonding with the flat plate to form a plastic tray, or bonding the foot to the flat plate to form a plastic tray.
  • the step of forming the thermoplastic into the flat plate of the plastic tray comprises: heating the bonding faces of the plurality of thermoplastic sheets until a molten layer is present, and then stacking the plurality of thermoplastic sheets to make the plurality of The molten layers are bonded to each other and then cooled and solidified to be bonded into a flat plate of a plastic tray.
  • the step of bonding the thermoplastic sheets to form the individual beams or the legs of the plastic tray comprises: cutting the thermoplastic sheet according to the specifications of the beam or the foot; The adhesive faces of the plurality of thermoplastic sheets are heated until a molten layer is formed, and then the cut plurality of thermoplastic sheets are stacked, and the plurality of the molten layers are bonded together and then cooled and solidified to be bonded into a plastic tray.
  • Each beam or each foot is
  • the step of bonding the thermoplastic sheets to form the individual beams or the legs of the plastic tray comprises: heating the bonding faces of the plurality of thermoplastic sheets until a molten layer is present; The plastic sheets are stacked, and the plurality of the molten layers are attached to each other and then cooled and solidified to be bonded; the plurality of thermoplastic sheets bonded together are cut into the beams of the plastic tray according to the width of the beam or each Only feet.
  • thermoplastic sheet is laid on the perforated plate, and the underside of the perforated plate is a negative pressure so that The thermoplastic sheet is adsorbed on the perforated plate.
  • the heating is performed using an infrared lamp, a hot air blower, or a hot plate.
  • the thermoplastic sheet material is a hollow sheet; when the stacking is performed, the reinforcing ribs of the adjacent hollow sheets are not parallel to each other.
  • the strip softening region intersects the reinforcing ribs of the hollow plate.
  • the strip-shaped softening region is heated by an infrared lamp tube parallel to the folding groove, and the infrared lamp tube has heat shielding plates on both sides thereof, wherein the heat insulation plate is used to concentrate the heat of the infrared lamp tube Folding the groove; or heating the strip softening zone with a hot air blower, and adjusting the nozzle for outputting the hot air to concentrate the heat at the folding groove.
  • the thermoplastic sheet material is a polypropylene hollow board or a polyethylene hollow board.
  • the thermoplastic plastic sheet is bonded into the plastic tray, and the equipment of the injection molding machine, the mold and the like is not required, and the cost is low; since the plastic sheet is cut and then bonded, the various specifications can be flexibly manufactured.
  • the hollow plate is a widely used plastic plate, and the hollow plate can be used to produce a plastic tray with a small weight and a large load. Taking polypropylene hollow board as an example, its weight is generally 6-8kg, and the bearing capacity is equal to the weight.
  • a plastic tray for injection molding is about 40% larger.
  • the manufacturing process of the beam and the foot of the plastic tray of the invention is simple and reliable, has high production efficiency, and can well guarantee product quality.
  • FIG. 1A is a schematic view showing the structure of a hollow plate according to the prior art
  • FIG. 1B is a schematic view showing the reinforcing ribs of the hollow plate intersecting each other according to an embodiment of the present invention
  • FIG. 2A is a hollow plate according to an embodiment of the present invention. a schematic diagram of heating the strip-shaped softened region
  • FIG. 2B is a schematic view of pressing a band-shaped softened region into a folded groove on a hollow panel according to an embodiment of the present invention
  • Figure 3A is a schematic illustration of the folding groove arrangement when the hollow sheet is folded into a W shape in accordance with an embodiment of the present invention
  • Figure 3B is a schematic view showing a heating state when a hollow plate is folded into a W shape according to an embodiment of the present invention
  • 3C is a schematic view showing a collapsed state of a hollow plate folded into a W shape according to an embodiment of the present invention
  • FIG. 4A is a schematic view of an assembled keel according to an embodiment of the present invention
  • FIG. 4B is a schematic view of an assembled keel according to an embodiment of the present invention
  • FIG. 5 is a schematic view of a plastic tray produced by a method according to an embodiment of the present invention.
  • the plastic tray is formed by stacking and bonding thermoplastic sheets. Specifically, the thermoplastic sheets are bonded to the individual beams of the plastic tray, or are bonded to each foot; the upper plate and the lower plate of the plastic tray are also made of thermoplastic, and may be laminated with a plurality of thermoplastic sheets.
  • thermoplastic material directly into the upper plate, the lower plate, or in one piece; finally, bond the beams to the plate, or combine the beams into keels. Rebond to the plate, or bond each foot to the plate in a certain distribution. Can be made into a single-sided tray or a double-sided tray. Plastic bonding can use various existing adhesives, but the adhesive often contains some harmful substances, is not environmentally friendly, and adds extra cost, so the preferred way is to use the physical properties of the thermoplastic itself to heat it. After softening, they are bonded to each other and cooled and bonded together. The manner in which the various parts of the plastic tray are manufactured is further described below.
  • thermoplastic sheets When manufacturing a flat plate, if a plurality of thermoplastic sheets are laminated and bonded, the bonding faces of the plurality of thermoplastic sheets may be heated until a molten layer is formed, and then the thermoplastic sheets are stacked to form a plurality of molten layers. Adhere to each other and bond to a flat plate after cooling and solidification.
  • a heating plate may be used for heating, which is a contact heating; non-contact heating may also be employed, for example, an infrared lamp tube, a hot air blower, etc., to avoid smoke from contact heating.
  • thermoplastic sheet In order to increase production efficiency and save energy, it is possible to heat a strip-like or lattice-like molten region on the surface of the thermoplastic sheet instead of heating all of its plane to melt.
  • the edge of the thermoplastic sheet may be pressed, or the thermoplastic sheet may be laid on a vacuum suction plate, or a combination of the two measures.
  • the vacuum adsorption plate has a flat box shape as a whole, and one of the two sides with the largest area has a plurality of holes, and the air is sucked from the inside of the vacuum adsorption plate to realize a negative pressure under the side of the hole, thereby sucking the thermoplastic plate. On the side.
  • the thermoplastic sheet may be a hollow board (or a corrugated board), such as a polypropylene hollow board or a polyethylene hollow board, or may be made of other thermoplastics.
  • Fig. 1A is a schematic view showing the structure of a hollow plate according to the prior art. As shown in Fig. 1A, such a hollow plate has upper and lower outer plates 1 1 and 12 and a plurality of reinforcing ribs 13 in the middle. In order to make the produced flat plate have higher strength, when the hollow plate is attached, the reinforcing ribs of the two plates may not be parallel to each other. For example, when the two hollow plates are attached, the reinforcing ribs are perpendicular to each other or 45°.
  • FIG. 1B is a schematic view of the reinforcing ribs of the hollow plate intersecting each other according to an embodiment of the present invention.
  • the reinforcing rib 151 in the former is substantially perpendicular to the reinforcing rib 161 in the latter in the flat plate 17 (only the schematic is shown in the drawing.
  • the surface is the outer surface of the outer layer, and the reinforcing rib of the actual hollow sheet is inside.
  • the thermoplastic sheet can be cut according to the specifications of the beam or the foot.
  • the thermoplastic sheet is cut into strips of O.lmx lm.
  • the thermoplastic sheet is cut into small pieces of O.lmxO.lm; then the bonded faces of the cut pieces of thermoplastic sheet are heated until a molten layer appears. Then, the cut pieces of the thermoplastic sheet are stacked, the plurality of molten layers are attached, and finally cooled and solidified to obtain the beams or the legs of the plastic tray.
  • the thermoplastic sheet can be cut with a water jet, which avoids environmental pollution caused by the hot knife cutting and thermal deformation of the thermoplastic sheet.
  • the beam or the foot it is also possible to first bond the large-area thermoplastic sheet first, and then use the above-mentioned method of manufacturing the flat plate, and then cut according to the specifications of the beam or the foot, but at this time, in order to ensure the beam or the foot The bonding is firm.
  • the flat surface of the thermoplastic sheet should be heated to melt.
  • the beam or the foot can also be made of a hollow plate. Because it is also a laminated structure, the ribs of the hollow plates of each layer can have an angle between them to increase the strength of the beam or the foot.
  • the above method for manufacturing the beam or the foot is to bond a plurality of thermoplastic sheets, and it is also possible to fold a single large thermoplastic sheet in a certain manner to obtain a beam or a foot, and to apply the respective bonding surfaces.
  • the molten layers are heated and bonded to each other.
  • a hollow plate is still used in this embodiment, and a folding groove is first formed on the hollow plate of the plate, and then folded along the folding groove.
  • the bonding surface is heated out of the molten layer before the hollow board surfaces on both sides of the folding groove are bonded to each other so as to be bonded after bonding.
  • the method of making the folded groove is to first heat the strip-shaped softened region on the hollow plate (in this case, no heating to melt), and then flatten the softened region to form a folded groove. It is preferable to use an infrared lamp or a hot air heater for heating because their temperature is easy to adjust, and the temperature can be changed in an approximately abrupt manner, and the work efficiency is high.
  • an infrared lamp tube is taken as an example for specific description. 2A is a schematic view of heating a strip-shaped softened region on a hollow panel in accordance with an embodiment of the present invention.
  • FIG. 2B is a schematic view of pressing a strip-shaped softened region into a folded groove on a hollow panel in accordance with an embodiment of the present invention.
  • the hollow plate 20 is laid on the vacuum adsorption plate 21, and pressed on both sides by the pressing wheels 221 and 222, and the infrared lamp tube 23 is placed on the hollow plate 20 to be formed into a folding groove.
  • the plate on both sides of the folding groove is not softened, and the heat insulating plate 24 may be attached to the infrared lamp tube 23.
  • the infrared lamp tube 23 is moved along its axial direction (in the direction of the drawing to the inside of the paper), so that the hollow plate 20 produces a band-shaped softened region, which is then shown by Fig. 2B, by a pressure roller or a pressure block (shown in the figure) It follows that the pressure roller 25) follows the infrared lamp tube 23 and advances therewith, thus pressing the softened area into a folded groove before it is cooled.
  • This approach has many advantages over the prior art practice of grooving with a tool. If the tool is grooved in the cooling state, more plate debris will be generated, and because there are many folding grooves, the machine will generate a lot of noise and vibration or even resonance when the groove is opened, which seriously affects the health of the operator and the machine.
  • the method is non-contact heating, does not generate vibration and debris, and can accurately control the position and width of the folding groove by pressing soft or briquetting, and realize heating concentration by control to ensure two folding grooves.
  • the side plate shape, so the manner of making the folding groove in this embodiment is obviously superior to the prior art method of using the tool to groove.
  • a relatively simple folding method is the so-called accordion mode, that is, the hollow plate is folded into a W shape. It should be noted that the folding groove The production must be carried out according to the folding method.
  • FIG. 3A is a schematic view showing a distribution of a folding groove when a hollow plate is folded into a W shape according to an embodiment of the present invention.
  • the folding grooves 31, 32, 33 are alternately distributed on both sides of the hollow plate 30.
  • more fold grooves can be made to form a continuous plurality of W shapes. According to this folding groove, the hollow plate is folded into the state of Fig. 3B, and Fig.
  • FIG. 3B is a schematic view showing the heating state when the hollow plate is folded into a W shape according to an embodiment of the present invention.
  • the hollow plate 30 has not yet been completely collapsed, forming a plurality of V-shapes (two V-shaped openings are shown upward and V-shaped one opening downwards), at which time each V-shaped The open side of the portion heats the inner surface of the V-shaped portion, for example, by heating the infrared lamp tubes 36, 37, 38 in the drawing to obtain a molten layer.
  • the hollow plate is gathered as shown in Fig. 3C to obtain a beam or a foot.
  • FIG. 3C is a schematic view showing a collapsed state of a hollow plate folded into a W shape according to an embodiment of the present invention.
  • the respective molten layers are bonded to each other, and at this time, the beam or the foot of the plastic tray is obtained by cooling.
  • the folding groove functions as a beam to make the hollow plate less deformable, and as long as the heating speed is fast enough,
  • the softened layer is heated and the hollow sheet is gathered prior to deformation.
  • the softened layer is heated within 3 seconds and the deformation is not caused by the folding.
  • This simultaneous heating and one-time folding manufacturing process has high production efficiency.
  • a sheet material it can be folded into a multi-layer structure in many ways, and the folding method is similar to the method for folding a corrugated board in the prior art in the production of a paper tray (for example, the folding method disclosed in Patent PCT/CN2010001455, except There are many other folding methods besides).
  • the bonding surfaces on both sides of the folding groove are heated to be melted, and then folded along the folding groove to bond the bonding surfaces on both sides. That is, the process is to heat both sides of one folding groove, fold and fit along the folding groove; and heat the other side of the folding groove, fold and fit along the folding groove; until the overall folding is completed. Since this operation method is to fold and fit along the folding groove in succession, the plate is pressed to prevent it from being thermally deformed each time it is heated.
  • the heated band-shaped softened region may be neither perpendicular nor parallel to the reinforcing rib of the hollow plate, so that the reinforcing ribs in the adjacent layers are inevitably not parallel or vertical after folding. Instead, it forms a certain angle, which helps to improve the mechanical strength of the resulting beam or foot.
  • the above is described by taking an infrared lamp for heating.
  • a hot air blower can be used, and by adjusting the size of the hot air outlet, heat can be concentrated in the folding groove. After the beam is made, the beam can be glued directly to the plate, or the beam can be assembled into a keel and bonded to the plate.
  • the upper and lower ends of the cross section of the beam can be wider than the middle.
  • the shape can be directly folded into the shape, or the beam having a rectangular cross section can be made first, and then the groove can be formed on the upper and lower sides.
  • Sheet metal parts Refer specifically to Figures 3D through 3G. 3D-3G are schematic illustrations of cross sections of several beams in accordance with an embodiment of the present invention. Both ends 301, 302 of the beam 300 in Fig. 3D are wider than the middle portion 303, and both ends are trapezoidal. The ends of the beam in Figure 3E are also wider than the middle, with a trapezoid at one end and a rectangular shape at the other end.
  • the beams in Figures 3D and 3E can be folded directly from plastic sheets.
  • the beam 330 in Fig. 3F is composed of a beam 331 having a rectangular cross section and two sheet member members 332, 333 which are formed by folding in the manner described above.
  • the sheet members 332, 333 are placed on the beam 331 of rectangular cross section, it is also necessary to heat each of the bonding surfaces to obtain a softened layer.
  • the gap can be cut in the middle of the beam and then inserted.
  • the fork hole can also be cut into the beam.
  • the molten layer is heated on the joint surface of the beam and the flat plate, and the molten layer is heated by the flat plate, and finally the two are bonded together to be cooled and solidified to be bonded to obtain a molded plastic tray.
  • FIG. 4A is a schematic view of an assembled keel according to an embodiment of the present invention
  • FIG. 4B is a schematic view of an assembled and formed keel according to an embodiment of the present invention. As shown in FIG. 4A, the beams are inserted into each other through the gaps therein.
  • the notches 41, 42, 43 on the beam 40 are respectively inserted into the notches 44, 45, 46 on the other beams, thereby obtaining the structure shown in FIG. 4B.
  • the fork holes 47, 48 are also shown in Figure 4A. 4A and 4B show a keel composed of three beams and three longitudinal beams, and the beam and stringers may be other numbers. For the foot, it is directly heated out of the molten layer, and the molten layer is heated out at the corresponding portion of the flat plate and then bonded, cooled and solidified.
  • the plastic tray of various specifications can be obtained by the above manufacturing method, and the form of the beam or the keel or the foot can be flexibly determined according to actual needs, for example, two kinds of plastic trays as shown in FIG. 5A and FIG. 5B can be produced.
  • 5A and 5B are schematic views of the outer shape of two plastic trays according to the present embodiment.
  • the plastic tray in Fig. 5A comprises a keel composed of four beams, wherein each layer of plastic sheets is stacked in a horizontal direction, so that higher strength can be obtained.
  • the plastic tray in Figure 5B is a nine-legged flat tray.
  • the thermoplastic plastic sheet is bonded into the plastic tray, and the large injection molding machine, the mold and the like are not required, and the cost is low; since the plastic sheet is cut and then bonded, the flexible manufacturing can be variously performed.
  • the hollow plate is a widely used plastic plate, and the hollow plate can be used to produce a plastic tray with a small weight and a large load. Taking a polypropylene hollow plate as an example, its self-weight is generally 6-8 kg, and the bearing capacity is about 40% larger than that of an injection molded plastic pallet of the same weight.
  • the manufacturing process of the beam and the foot of the plastic tray in the embodiment is simple and reliable, has high production efficiency, and can well ensure product quality.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pallets (AREA)

Abstract

L'invention concerne un procédé pour fabriquer une palette en matière plastique et une palette en matière plastique fabriquée par le procédé. Le procédé consiste à : lier des plaques thermoplastiques pour former des poutres ou des pieds d'une palette en matière plastique ; transformer une plaque thermoplastique en une plaque plate de la palette en matière plastique ; lier les poutres à la plaque plate pour former la palette en matière plastique ; ou, en variante, assembler les poutres en un noyau puis lier le noyau à la plaque plate de façon à former la palette en matière plastique ; ou, en variante, lier les pieds à la plaque plate pour former la palette en matière plastique. Le procédé peut être utilisé pour fabriquer des palettes en matière plastique qui ont un poids mort inférieur et peuvent porter un chargement plus lourd, et l'équipement est simple et petit et peut fabriquer de manière flexible des palettes en matière plastique de différentes spécifications.
PCT/CN2013/000602 2013-05-17 2013-05-23 Procede pour fabriquer une palette en matiere plastique et palette en matiere plastique WO2014183233A1 (fr)

Applications Claiming Priority (2)

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CN201311819690 2013-05-17
CN2013101819690.9 2013-05-17

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WO2014183233A1 true WO2014183233A1 (fr) 2014-11-20

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0326239A1 (fr) * 1988-01-29 1989-08-02 Manx Project Development Services Limited Méthode pour produire une pallette
CN1126658A (zh) * 1994-08-12 1996-07-17 智索公司 具有卓越刚性的可加工片材及其制造方法
CN1208387A (zh) * 1996-01-11 1999-02-17 博里利斯股份公司 塑料板台
CN1403254A (zh) * 1999-01-13 2003-03-19 宋维宁 一种复合材料产品
US20110174197A1 (en) * 2010-01-20 2011-07-21 Tooling Technology, Llc Reinforced hollow panel and method of making
CN203372520U (zh) * 2013-05-17 2014-01-01 张岩 一种塑料托盘

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0326239A1 (fr) * 1988-01-29 1989-08-02 Manx Project Development Services Limited Méthode pour produire une pallette
CN1126658A (zh) * 1994-08-12 1996-07-17 智索公司 具有卓越刚性的可加工片材及其制造方法
CN1208387A (zh) * 1996-01-11 1999-02-17 博里利斯股份公司 塑料板台
CN1403254A (zh) * 1999-01-13 2003-03-19 宋维宁 一种复合材料产品
US20110174197A1 (en) * 2010-01-20 2011-07-21 Tooling Technology, Llc Reinforced hollow panel and method of making
CN203372520U (zh) * 2013-05-17 2014-01-01 张岩 一种塑料托盘

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