EP0071527A1 - Verfahren zum Thermoverformen von thermoplastischen kegelstumpfartigen Behältern und nach diesem Verfahren hergestellter thermoplastischer Behälter - Google Patents

Verfahren zum Thermoverformen von thermoplastischen kegelstumpfartigen Behältern und nach diesem Verfahren hergestellter thermoplastischer Behälter Download PDF

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Publication number
EP0071527A1
EP0071527A1 EP82401370A EP82401370A EP0071527A1 EP 0071527 A1 EP0071527 A1 EP 0071527A1 EP 82401370 A EP82401370 A EP 82401370A EP 82401370 A EP82401370 A EP 82401370A EP 0071527 A1 EP0071527 A1 EP 0071527A1
Authority
EP
European Patent Office
Prior art keywords
container
frustoconical
pyramidal
large base
strip
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
EP82401370A
Other languages
English (en)
French (fr)
Inventor
Roland Torterotot
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0071527A1 publication Critical patent/EP0071527A1/de
Ceased legal-status Critical Current

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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
    • 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
    • B65D1/26—Thin-walled containers, e.g. formed by deep-drawing operations

Definitions

  • the present invention relates to a process for thermoforming thermoplastic containers of pyramidal or frustoconical shape, the bottom of which is in the plane or close to the large base, base of the frustoconical part of the container, from a thermoplastic strip, method according to which first brings the thermoplastic strip to the softening temperature appropriate for thermoforming, then places said softened strip above the opening of a forming mold and the portion of the strip being delimited is applied by the opening of the mold, against the internal face of the forming chamber of said mold (see French patent 2,256,818).
  • the scrap of the thermoplastic strip - that is to say the quantity of thermoplastic material of the flat strip not used for the manufacture of the containers - is very important and can reach 50% and more the thermoplastic strip.
  • the present invention aims to eliminate the aforementioned drawbacks in the context of a process for thermoforming thermoplastic containers from a thermoplastic strip, containers whose large base of the frustoconical part is located on the side of the bottom of the container.
  • a bi-frustoconical or bi-pyramidal container is thus obtained having a larger opening than a container whose frustoconical part with small base at the top extends to the opening situated in the plane of the thermoplastic strip. Due to a larger opening, the quantity of thermoplastic material used for the production of the side wall and the container bottom is greater and the material drops are reduced. In addition, the consumption of the product contained in the container is also faciliti due to the larger opening and the downward and inward tilting of the upper part of the container.
  • the invention also relates to a frustoconical or pyramidal thermoplastic container, the large base of which is located on the bottom side of the container thermoformed from a thermoplastic strip.
  • the container of this type is characterized in that it comprises, on the one hand, a frustoconical or pyramidal upper part, the opening of which is situated in the plane of the horizontal rim of the container and of the large base of said upper part and, on the other hand, a frustoconical or pyramidal lower part whose large base located on the side of the container bottom has a cross section at least equal to that of the large base of the upper part but slightly less than the periphery of the rim of the container, the height of the upper part being equal to at least one tenth and at most one third of the total height of the container which is equal to a value between once to twice the diameter of the opening of the container.
  • thermoforming a frustoconical or pyramidal container 1 from a thermoplastic strip and having an opening with a smaller section than the bottom section is known for example from French patent 74.00409 (2 256 818) so that it is not necessary to describe it in detail.
  • an upper lateral part 3 of the container 1 is formed from a thermoplastic strip 2 brought to the appropriate softening temperature, part which has a frustoconical or pyramidal shape containing at its upper end the circular, oval or polygonal opening 4 of the container, opening which is situated in the plane of the horizontal rim 5 of the container 1 and as long as the latter is attached to the strip 2 is situated in the plane of the said strip and which constitutes, at the same time, the large base of the upper lateral part 3 of said container 1.
  • the small base 6 of the upper lateral part 3 is located below the opening 4.
  • the inclination of the frustoconical or pyramidal wall of the upper lateral part 3 is chosen so that the generator 7 of said wall, generator located in an axial plane perpendicular to said frustoconical or pyramidal wall intersects the bottom 8 of the reci track on a radial line 9 at a point 10 located on said line 9 on the same side as said wall, the distance between said point 10 and the center 11 of the bottom 8 having a value between zero (see right 12) and seven eighths of the radius of opening 4 taken in the same plane (see right 13).
  • the inclination of the wall of the upper frustoconical part 3 relative to the axis of the container is generally small and may be between a few degrees , for example, two degrees and fifteen to twenty degrees.
  • the height h of the frustoconical or pyramidal upper part 3 of the container 1 is equal to at least one tenth and, at most, to one third of the total height H of the container 1.
  • the container 1 has a frustoconical or pyramidal lower part 14 arranged coaxially with the upper part 3 and the small base 15 of which is situated above the large base 16 which is provided near or confused with the bottom 8 of the container 1 and whose cross section is greater than or equal to that of the opening 4, that is to say at the large base of the frustoconical or pyramidal upper part 3.
  • the two small bases 6, 15 of the upper part 3 and the lower part 14 may have the same cross section or slightly different cross sections and be located in the same horizontal plane 17 and either coincide - as is the case represented in FIG.
  • the bottom 8 of the container 1 can have the most diverse shapes. It can be planar so that the large base 16 of the frustoconical lower part 14 is practically coincident with said bottom. However, this bottom 8 can also have an edge 18 curved upwards in the manner of a bowl so that the large base 16 is at a certain distance, for example equal to h, above the flat central part. from the bottom 8.
  • the container 1 For thermoforming, it is advantageous to give the container 1 a total height H which is between once and twice, preferably I l, 2 times the diameter of the opening 4 of the container 1.
  • the small bases 6 'and 15' of the frustoconical or pyramidal parts upper 3 'and lower 14' can be at a distance from the bottom 8 equal to two thirds of the height total H of the container.
  • the hatched ring 19 the dimensions of which are determined by the intersections of the generators 7 of the upper frustoconical part 3 and of the generators 20 of the lower frustoconical part 14 of the container 1, is indicated plane of the opening 4 thereof, the quantity of additional material used for the production of the side wall and the bottom of the container 1 relative to a frustoconical container whose side wall does not have the upper inverted frustoconical part 3.
  • the inclination of the generators 20 relative to the vertical axis 18 of the container 1 can be a few degrees, for example two degrees, and go up to twenty degrees.
  • Generators 7 and 20 of frustoconical upper 3 and lower 14 parts located in the same axial plane but on the other side with respect to the container axis 18 may be parallel to each other.
  • edges 5 of the containers 1 will be cut from the strip 2, for example individually or in rows of two containers, these rows extending perpendicular to the longitudinal edges of the strip 2
  • the cutting configuration 21 of edges 5 is in the case of a frustoconical container 1 a circle concentric with the axis 18 whose diameter is slightly greater, for example by a few mm., Than the diameter of the largest cross section. , that is to say of the section of the large base 16 of the lower part 14 of the container 1.
  • a gripping tab 22 and when the containers 1 are grouped in pairs, a junction zone 23 is provided between two adjacent rims with a weakening line 24 facilitating the breaking of the neighboring edges 5 and thus the separation of two containers 1.
  • thermoforming which consists of two separable halves, for example similar to that of the aforementioned French patent 2,256,818 and which comprises a forming chamber whose configuration is that of the periphery of the bi-frustoconical container or bi-pyramid according to the invention.
  • thermoformed containers can be obtained from a thermoplastic strip which have a frustoconical shape whose large base is located on the side of the bottom of the container and which use either the same amount of material or almost as much material for the formation of the side wall and the bottom as the cylindrical side wall containers.
  • the container opening is given a section equal to that of the large base of the frustoconical or lower pyramidal part, the same quantity of material is used for the production of the side wall and the bottom as for like elements of a cylindrical or parallelepiped container.

Landscapes

  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
EP82401370A 1981-07-29 1982-07-23 Verfahren zum Thermoverformen von thermoplastischen kegelstumpfartigen Behältern und nach diesem Verfahren hergestellter thermoplastischer Behälter Ceased EP0071527A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8114765A FR2510467B1 (fr) 1981-07-29 1981-07-29 Procede de thermoformage de recipients thermoplastiques de forme tronconique et recipients thermoplastiques obtenus
FR8114765 1981-07-29

Publications (1)

Publication Number Publication Date
EP0071527A1 true EP0071527A1 (de) 1983-02-09

Family

ID=9260971

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82401370A Ceased EP0071527A1 (de) 1981-07-29 1982-07-23 Verfahren zum Thermoverformen von thermoplastischen kegelstumpfartigen Behältern und nach diesem Verfahren hergestellter thermoplastischer Behälter

Country Status (4)

Country Link
EP (1) EP0071527A1 (de)
JP (1) JPS5864931A (de)
ES (1) ES274619U (de)
FR (1) FR2510467B1 (de)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3194423A (en) * 1962-12-07 1965-07-13 Mailoff Lazare Portion receptacles for yoghurt milk and the like
US3465071A (en) * 1966-06-08 1969-09-02 Illinois Tool Works Reduced neck article forming method and apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3194423A (en) * 1962-12-07 1965-07-13 Mailoff Lazare Portion receptacles for yoghurt milk and the like
US3465071A (en) * 1966-06-08 1969-09-02 Illinois Tool Works Reduced neck article forming method and apparatus

Also Published As

Publication number Publication date
FR2510467B1 (fr) 1986-06-13
ES274619U (es) 1984-10-01
FR2510467A1 (fr) 1983-02-04
JPS5864931A (ja) 1983-04-18

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