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
  • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
  • B65D1/22—Boxes or like containers with side walls of substantial depth for enclosing contents
  • B65D1/225—Collapsible boxes

Definitions

• the present invention relates to a method for manufacturing boxes, especially for transporting bottles.
• boxes for transporting beer and mineral bottled in the usual bottles of 3/8 litre have been made of impact- proof plastic, whereas beverages bottled in larger bottles of 3/4 litre are usually transported in cardboard boxes.
• These boxes cannot withstand strong mechanical forces and cannot be used again. Consequently they cannot be used for returning the empty bottles, if required. Therefore, for some time boxes of plastic have been manufactured, intended for larger bottles than the usual beer bottles, but otherwise of a construction similar to that of the known beer boxes.
• the moulds or matrices must have a draw which as for the core must be larger, the taller the box is.
• the thickness of the bottom must be larger than necessisated by the ultimate strength to obtain the necessary draw angle.
• Inside ribs must be reduced to a minimum and must necessarily be vertical, otherwise the core cannot be drawn up, which means that only ribs serving as attachments for supporting ribs inserted later on should be placed inside and must start from the bottom where they must also be thicker and broader than at the top to let the core be released.
• the supporting ribs necessary to keep the weight of the box to a minimum must therefore be placed on the outside, where, as mentioned, the mould parts are jaws which can be drawn away from the finished box.
• the invention departs from the traditional conception that it is an economical necessity to manufacture boxes in one single process - that it is necessary to cast the boxes in a jaw tool - the invention indicating a method which makes the use of multi-dayl ight tools possible, i.e. an injection and compression tool where the moulds are placed above each other in "storeys" forming cavities which correspond to the shape of the object to be produced
• multi-dayl ight tools i.e. an injection and compression tool where the moulds are placed above each other in "storeys" forming cavities which correspond to the shape of the object to be produced
• the most obvious idea would be to produce the bottom, side and end parts separately and then rivet or weld them, but this would be so time-consuming owing to the necessary temporary assembly of the individual parts during the riveting or welding, removal of same and possible reinforcements, that the usual casting in jaw tool would be preferable.
• the box is injected and compressed in expanded condition in a multi-daylight tool with side and end parts connected to the bottom by flaps which are weakened so as to serve as hinges so that when folded the side and end parts are led over and support against a raised edge of the bottom along the periphery of same.
• the hinges define the axis around which the side and end parts are swung over the raised edge of the bottom so as to be kept against this. At the same time they must be strong enough to withstand rough handling.
• the tensile strength between the bottom and sides can be increased by providing the side and end parts along the bottom edge with a number of short ribs and the bottom with a corresponding number of short ribs in which longish holes are milled so that during the folding the ribs of the side and end parts are pressed into these holes.
• the assembling and riveting or welding of the side and end parts can be made rapidly and conveniently when the end or side parts are shaped with a broad bent edge which during the folding catches around the side parts or the end parts respectively and retains them.
• the uttermost brims of the side parts can be offset in a width and depth corresponding to the width and thickness of the bent edge of the end parts so that after the riveting or the welding the edges are flush with the outer surface of the side parts.
• the method according to the invention leaves it to the constructor to place the supporting ribs, the only demand on same being that they must not be undercut so that the mould cannot be released.
• a considerably smaller amount of plastic is used for the method according to the invent ion compared to the conventional method, and the time spent on the simple assembling process is recovered by the faster cooling which is possible when using multi-daylight tools.
• a further advantage of using multi-daylight tools made possible by the invention is that two boxes can be cast at a time.
• the invention also relates to a box manufactured by the method according to the invention, but not in a conventional manner.
• the special construction details which make it possible to reduce the outside dimensions by approx. 15% and to provide the box with plane outer surfaces without protrusions of any kind will appear from the following detailed description of an embodiment of the invention with reference to the drawing in which Fig. 1 shows the finished box in expanded condition,
• Fig. 2 shows part of fig. 1 on enlarged scale
• Fig. 3 shows a section through a side part by line I I I - I I I of fig. 2,
• Fig. 4 shows a corner of the folded and welded box from above
• Fig. 5 shows a side and sectional view of the same corner of the box at the bottom.
• the box is cast in expanded condition, consisting of two side parts 1, two end parts 2, and a bottom part 3.
• the bottom is provided with a raised edge 4 serving as supporting edge for the end parts and side parts when folded.
• the end parts are provided with a flap 4 which encloses the side parts 1 after the folding.
• fig. 3 showing the profile of the side parts, these are offset along the side edges in a width and depth 5 corresponding to the width and thickness of the flaps 4 so that after the folding and welding the box appears with smooth outer surfaces.
• hinges 6, fig. 1 are cast as a connected whole, the side parts and end parts being fixed to the bottom by means of hinges 6, fig. 1.
• these hinges consist of short thin bars resulting from cutouts 8 in tne edge of the bottom, and flaps 9 extending from the bottom edge of the side and end parts.
• this construction of the hinges effects that during the folding the side and end parts are swung over the raised edge 4 of the bottom part and will stand on this.
• the connection between the bottom and the side and end parts is further reinforced by the ribs 10 and 11.
• the ribs 11, which are made in one piece with the bottom, are provided with a longish hole through which the ribs 10, which are made in one piece with the side and end parts, are pressed during the folding, as it will appear from fig. 5.
• the bottom of the box is shaped in the usual way as a network of broad bands provided with supporting fins 12. Contrary to the usual construction of boxes for bottles, no supporting ribs extending from the bottom to about the middle of the box are used, but an intermediate piece 13, fig. 5, with supporting fins corresponding to the fins 12 of the bottom.
• This construction is made possible by the special method according to the invention, the intermediate piece 13 being inserted between horizontal pairs of ribs 14 made in the side parts.
• the end parts may be provided with supporting ribs 15, fig. 1, for the vertical fins of the intermediate piece 13.
• brim reinforcements 16 and 17 directed inwards can be made.
• the brim reinforcement of the end parts are provided with cutouts 18 and 19 so that bottles can be inserted and removed without impediments.
• the box is provided with the usual holes 20 in the side and end parts for carrying the box, but contrary to the known boxes, the brim reinforcements 21, fig. 2, are made on the inside just as all the other reinforcements, of which only the ribs 22 are shown, are made on the inside
• the invention can be used for manufacturing boxes of every dimension, but as mentioned in the general description of the invention, it is intended for manufacturing boxes with tall sides and ends. According to the construction described, which is not practically possible without applying the invention, it has e.g. been possible to manufacture a box for bottles of 3/4 litre, the volume of which is 15% smaller than that of known boxes for this purpose, and with a saving of plast mass of approx. 40%.

Landscapes

• Engineering & Computer Science (AREA)
• Ceramic Engineering (AREA)
• Mechanical Engineering (AREA)
• Rigid Containers With Two Or More Constituent Elements (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8125745

Family Applications (1)

Country Status (4)

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Family Cites Families (6)

• 1982
  • 1982-08-18 DK DK369382A patent/DK369382A/da unknown
• 1983
  • 1983-04-29 OA OA57986A patent/OA07414A/xx unknown
  • 1983-08-18 WO PCT/DK1983/000077 patent/WO1984000736A1/en unknown
  • 1983-08-18 EP EP83902750A patent/EP0116607A1/en not_active Withdrawn

Non-Patent Citations (1)

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