US3717430A - Apparatus for temporarily reducing the volume of a synthetic material container - Google Patents

Apparatus for temporarily reducing the volume of a synthetic material container Download PDF

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Publication number
US3717430A
US3717430A US00054796A US3717430DA US3717430A US 3717430 A US3717430 A US 3717430A US 00054796 A US00054796 A US 00054796A US 3717430D A US3717430D A US 3717430DA US 3717430 A US3717430 A US 3717430A
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United States
Prior art keywords
closed
sections
container
tubing
length
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Expired - Lifetime
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US00054796A
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English (en)
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G Hansen
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Individual
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/48—Moulds

Definitions

  • the present invention relates to methods of and apparatus for temporarily reducing the volume of a synthetic material container located in a closed hollow mould, in particular shortly before closure of the container.
  • apparatus for temporarily reducing the volume of a synthetic material container in a closed hollow mould comprises at least one wall section of the hollow mould located in the neighborhood of the belly of the container, a drive motor for displacing the wall section towards the container and arranged to maintain the section for a controlled time in the displaced position in dependence upon the shrinkage of the container, which position is determined by a stop element.
  • the volume of the open container is reduced until it is closed.
  • the closed, now pressureless container then initially has a larger volume so that excess pressure can only develop inside it as a consequence of shrinkage if the container shrinks to a greater extent than corresponds with the preceding increase in volume.
  • the shrinkage volume and enlargement volume can be adapted to one another so that the container can be kept virtually free of internal pressure even when very fully filled.
  • the pressure to be exerted upon the container prior to its closure can be produced in a variety of ways. For example, considering a container which is blowmoulded using at least an externally applied vacuum, the inflated belly of the container can be maintained at superatmospheric pressure. It is equally possible, however, to apply the desired pressure mechanically.
  • a mechanical pressure may be exerted upon the container.
  • This measure has the advantage that the displacement travel of the wall section is limited and can be accurately adjusted so that the desired effect is achieved within the limits determined by the shrinkage process and within narrow tolerances.
  • the wall section is adapted to the external form of the container so that the container shape is not undesirably affected by same.
  • FIG. 1 is an elevational cross-sectional view of a production mold constructed in accordance with the present invention taken substantially along line I-I of FIG. 2, but not showing the extrusion press or the supply and filler device which are illustrated in FIG. 2;
  • FIG. 2 is a cross-sectional view taken substantially along line 11-11 of FIG. 1, and further showing schematically the conventional extrusion press and supply and filler device with which the present invention is used as well as a length of tubing of synthetic material in its original, as extruded form;
  • FIG. 3 is a side elevation of part of the production mould.
  • FIG. 4 is a cross-section on the line IV-IV of FIG. 3.
  • a slide 2 can be displaced on a table 1 by means of a control cylinder 3, from a position beneath an extrusion press 4, to a position beneath a supply and filler device 5, the press 4 and supply and filler device 5 being conventional and no further description need to given.
  • the slide 2 carries two bottom mould halves l2 and 12a of a hollow mould which are displaceable transversely of the direction of displacement of the control cylinder 3.
  • the bottom mould halves carry a suction head 14, respectively between which and the associated bottom mould half a respective top mould half 16 or 16a can be displaced in the same direction as the bottom mould halves 12, 12a.
  • the bottom mould halves 12, 12a, the suction heads 14, 14a and the top mould halves 16, 16a are connected through vacuum sources controllable as desired and at will.
  • the bottom mould halves 12, 12a and the suction heads 14, 140 can be directly connected with one another.
  • the bottom mould half 12 can be displaced independently by a control cylinder 17 and the top mould half 16 similarly be displaced independently by a control cylinder 18.
  • the wall section 26 can, for purposes of displacement within the closed production mould 12, 12a, be arranged to form only a limited part of the mould wall which is intended to mould the container.
  • the wall section 26 has outward-projecting arms 27 and 28 with which control cylinders 29, 30 which act as drive motors and are fitted to the bottom mould half 12 respectively engage. At the side remote from the control cylinders 29, 30 are respectively fitted mounting arms 31, 32, each of these arms carrying a screw 33 to act as an adjustable stop element vis-a-vis the arm 27 or 28 to limit or determine the displaced position of wall section 26.
  • the screws 33 of the two co-operating bottom mould halves l2 and 12a may possibly be arranged at different heights or positions in order not to interfere with'the closing of the production mould.
  • the open production mould is located below the die orifice of the extrusion press 4, which produces a section of tube 6 of synthetic plastics material.
  • the two bottom mould halves 12;, 12a traverse together.
  • a vacuum is applied to the external surface of the tube 6 through the bottom mould halves 12, 12a.
  • the top mould halves 16, 16a although picked up and carried along with the bottom mould halves 12, 12a, are not closed.
  • the tube section 6 is held at its top end by the suction heads 14, 14a which have been traversed together, before it is separated from the extrusion press by suitable means.
  • the production mould then passes beneath the tiller element which is lowerable such that its mouth rests on the bottom mould halves 12, 12a through the intermediary of the tube of synthetic material.
  • compressed air is blown in, possibly until the container belly has been fully inflated, and the arrangement may be such that the air can only escape from the container by overcoming a certain back pressure.
  • the material with which the container is to be filled is supplied into thebelly of the container, displacing the air (possibly compressed air), as it does so.
  • the tiller element 5 is lifted away.
  • the control cylinders 29, 30 are operated and the wall sections 26, 260 are displaced so that the volume of the belly of the container is reduced. The displacement of only one of the wall sections may possibly suffice. Only then are the top mould halves 16, 16a closed in order to form the top of the container,-and the exterior of the latter is exposed to a vacuum.
  • the filled and closed container is ejected by opening the production mould. Any container which happens to stick in the mould can be removed by moving the wall section 26 backwards and forwards.
  • the movable parts of the production mould after the ejection of the finished container, revert to their initial positions. As soon as the production mould arrives beneath the extrusion press 4, a new cycle can be started.
  • the wall section 26 is displaced by an amount corresponding to the reduction in volume of the closed container on cooling, and possibly to the volumetric change in the filler material on assuming the environmental temperature. In this way a pressure is exerted on the container sufficient to produce a reduction in volume of the container corresponding to the reduction in volume of the containeron cooling when closed, and possibly in addition to the volumetric change of the filler material. The pressure is exerted on at least part of the belly of the container for a controlled time and lasts at least until the container is closed.
  • the wall section or sections 26 and 26A are maintained in their displaced position(s) for a redetermined controlled time in dependence on the s rmkage of the container, the
  • the container can, instead of or in addition to the mechanical deformation, be briefly subjected, prior to the closure of the top mould halves 16, 16a, to a slight superatmospheric pressure of for example mm of water, which is chosen so as to produce a shrinkage corresponding with the shrinkage of the container material and the volumetric change of the substance with which the container is filled.
  • movable lower mold sections mounted for radial movement between open and closed positions for enclosing the lower part of a length of tubing of synthetic material therebetween when closed;
  • movable upper mold sections mounted for radial movement relative to said lower sections between open and closed positions for enclosing the upper part of said length of tubing therebetween when closed;
  • separate force applying means carried by at least one of said lower mold sections, said force applying means being operable when the mold sections are in their closed position for applying an inwardly directed force on an area of said lower part of said length of tubing whereby to reduce the inner volume of the latter while the same is enclosed by the closed mold sections.
  • said means for applying the inwardly directed force comprises a relatively inwardly movable wall portion carried by one of the lower mold sections and means for moving said wall portion toward the length of tubing when the lower sections are in their closed positions.
  • stop means operably connected to said portion of the wall to limit the movement of the latter in a direction toward said length of tubing.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
US00054796A 1969-07-18 1970-07-14 Apparatus for temporarily reducing the volume of a synthetic material container Expired - Lifetime US3717430A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1936648A DE1936648C3 (de) 1969-07-18 1969-07-18 Verfahren und Vorrichtung zum Herstellen von mit fließfähigem Gut gefüllten Kunststoffbehältern

Publications (1)

Publication Number Publication Date
US3717430A true US3717430A (en) 1973-02-20

Family

ID=5740238

Family Applications (1)

Application Number Title Priority Date Filing Date
US00054796A Expired - Lifetime US3717430A (en) 1969-07-18 1970-07-14 Apparatus for temporarily reducing the volume of a synthetic material container

Country Status (6)

Country Link
US (1) US3717430A (ja)
JP (1) JPS4830671B1 (ja)
CH (1) CH509140A (ja)
DE (1) DE1936648C3 (ja)
FR (1) FR2056363A5 (ja)
GB (1) GB1294920A (ja)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3911071A (en) * 1972-11-20 1975-10-07 Pmd Entwicklungswerk Method of production of a bottle-shaped container, filled, sealed and ready for shipment
US3936264A (en) * 1973-03-07 1976-02-03 Respiratory Care, Inc. Apparatus for blow molding a container with breachable sealing members
US4054017A (en) * 1972-11-20 1977-10-18 Pmd Entwicklungswerk Fur Kunststoff-Maschinen Gmbh & Co. Kg. Apparatus for production of a bottle-shaped container, filled, sealed and ready for shipment
US4076484A (en) * 1975-11-10 1978-02-28 Hercules Incorporated Injection-blow molding machine having non-splitting injection and blow molds
US4708625A (en) * 1986-04-11 1987-11-24 C & F Stamping Co., Inc. Mold closing apparatus
US4798525A (en) * 1986-08-08 1989-01-17 Toto Ltd. Casting installation
US5037684A (en) * 1989-07-19 1991-08-06 Graham Engineering Corporation Blow molded aseptic bottle and method
US5054267A (en) * 1990-08-06 1991-10-08 Graham Engineering Corporation Apparatus sealing blow molded bottle
US5054272A (en) * 1990-08-06 1991-10-08 Graham Engineering Corporation Method for sealing blow molded bottle
US5068075A (en) * 1989-07-19 1991-11-26 Graham Engineering Corporation Method of blow molding aseptic bottles
US5776518A (en) * 1995-05-16 1998-07-07 Ultraseal Technologies Corporation Bottle mold and adjustable top block assembly and top block alignment members

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2237643A1 (de) * 1972-07-31 1974-02-21 Pmd Entwicklungswerk Verfahren und vorrichtung zum herstellen eines kunststoffbehaelters
DE2720448C2 (de) * 1977-05-06 1981-09-24 Rainer 3530 Warburg Fischer Vorrichtung zur Herstellung von Kunststoff-Hohlkörpern

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2425610A (en) * 1947-08-12 Mold back
US3032809A (en) * 1960-04-26 1962-05-08 Owens Illinois Glass Co Method and apparatus for producing plastic bottles
US3241187A (en) * 1962-02-13 1966-03-22 Inv S Finance Corp Hydro-mechanical clamps
US3277534A (en) * 1963-11-07 1966-10-11 Union Carbide Corp Apparatus for molding hollow plastic articles
US3325860A (en) * 1963-10-30 1967-06-20 Hansen Gerhard Moulding and sealing machines
US3331902A (en) * 1965-08-30 1967-07-18 Stark Sven Olof Soren Method of producing filled and sealed containers
US3583036A (en) * 1969-04-07 1971-06-08 Koehring Co Double web differential forming apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2425610A (en) * 1947-08-12 Mold back
US3032809A (en) * 1960-04-26 1962-05-08 Owens Illinois Glass Co Method and apparatus for producing plastic bottles
US3241187A (en) * 1962-02-13 1966-03-22 Inv S Finance Corp Hydro-mechanical clamps
US3325860A (en) * 1963-10-30 1967-06-20 Hansen Gerhard Moulding and sealing machines
US3277534A (en) * 1963-11-07 1966-10-11 Union Carbide Corp Apparatus for molding hollow plastic articles
US3331902A (en) * 1965-08-30 1967-07-18 Stark Sven Olof Soren Method of producing filled and sealed containers
US3583036A (en) * 1969-04-07 1971-06-08 Koehring Co Double web differential forming apparatus

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3911071A (en) * 1972-11-20 1975-10-07 Pmd Entwicklungswerk Method of production of a bottle-shaped container, filled, sealed and ready for shipment
US4054017A (en) * 1972-11-20 1977-10-18 Pmd Entwicklungswerk Fur Kunststoff-Maschinen Gmbh & Co. Kg. Apparatus for production of a bottle-shaped container, filled, sealed and ready for shipment
US3936264A (en) * 1973-03-07 1976-02-03 Respiratory Care, Inc. Apparatus for blow molding a container with breachable sealing members
US4076484A (en) * 1975-11-10 1978-02-28 Hercules Incorporated Injection-blow molding machine having non-splitting injection and blow molds
US4708625A (en) * 1986-04-11 1987-11-24 C & F Stamping Co., Inc. Mold closing apparatus
US4798525A (en) * 1986-08-08 1989-01-17 Toto Ltd. Casting installation
US5037684A (en) * 1989-07-19 1991-08-06 Graham Engineering Corporation Blow molded aseptic bottle and method
US5068075A (en) * 1989-07-19 1991-11-26 Graham Engineering Corporation Method of blow molding aseptic bottles
US5054267A (en) * 1990-08-06 1991-10-08 Graham Engineering Corporation Apparatus sealing blow molded bottle
US5054272A (en) * 1990-08-06 1991-10-08 Graham Engineering Corporation Method for sealing blow molded bottle
US5776518A (en) * 1995-05-16 1998-07-07 Ultraseal Technologies Corporation Bottle mold and adjustable top block assembly and top block alignment members

Also Published As

Publication number Publication date
CH509140A (de) 1971-06-30
FR2056363A5 (ja) 1971-05-14
GB1294920A (ja) 1972-11-01
DE1936648C3 (de) 1975-07-24
JPS4830671B1 (ja) 1973-09-21
DE1936648A1 (de) 1971-02-04
DE1936648B2 (de) 1974-12-19

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