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WO2005028186A1 - Plastic injection molded part and receptacle produced by blow molding the plastic injection molded part - Google Patents

Plastic injection molded part and receptacle produced by blow molding the plastic injection molded part Download PDF

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Publication number
WO2005028186A1
WO2005028186A1 PCT/EP2004/008917 EP2004008917W WO2005028186A1 WO 2005028186 A1 WO2005028186 A1 WO 2005028186A1 EP 2004008917 W EP2004008917 W EP 2004008917W WO 2005028186 A1 WO2005028186 A1 WO 2005028186A1
Authority
WO
WIPO (PCT)
Prior art keywords
container
plastic injection
molded part
base body
injection molded
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
PCT/EP2004/008917
Other languages
German (de)
French (fr)
Inventor
Martin Albers
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.)
Georg Menshen GmbH and Co KG
Original Assignee
Georg Menshen GmbH and Co KG
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 Georg Menshen GmbH and Co KG filed Critical Georg Menshen GmbH and Co KG
Publication of WO2005028186A1 publication Critical patent/WO2005028186A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/2618—Moulds having screw-threaded mould walls
    • 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
    • B65D39/00—Closures arranged within necks or pouring openings or in discharge apertures, e.g. stoppers
    • B65D39/08—Threaded or like closure members secured by rotation; Bushes therefor
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/072—Preforms or parisons characterised by their configuration having variable wall thickness
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/073—Preforms or parisons characterised by their configuration having variable diameter
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/074—Preforms or parisons characterised by their configuration having ribs or protrusions
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/074—Preforms or parisons characterised by their configuration having ribs or protrusions
    • B29C2949/0744—Preforms or parisons characterised by their configuration having ribs or protrusions at neck portion
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
    • B29C2949/0768—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
    • B29C2949/077—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the neck
    • B29C2949/0772—Closure retaining means
    • B29C2949/0773—Threads
    • B29C2949/0775—Inner threads
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/079—Auxiliary parts or inserts
    • B29C2949/0792—Closure
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/22—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at neck portion
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/24—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at flange portion
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/26—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at body portion
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/28—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at bottom portion
    • 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
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/06—Injection blow-moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/253—Preform
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/253—Preform
    • B29K2105/258—Tubular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/56—Stoppers or lids for bottles, jars, or the like, e.g. closures
    • B29L2031/565—Stoppers or lids for bottles, jars, or the like, e.g. closures for containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7158—Bottles

Definitions

  • the invention relates to a plastic injection molded part, which enables subsequent shaping by blow molding into a container, such as a container, a bottle or the like, and to a container of this type, produced by blow molding the plastic injection molded part.
  • preforms generic plastic injection molded parts, also referred to as preforms, as an intermediate for the manufacture of plastic beverage bottles.
  • the beverage bottle is therefore produced in a two-stage process, in which the preform is first formed by injection molding a suitable plastic material and then the preform is shaped into the final bottle shape using a blow molding technique known to the person skilled in the art.
  • the injection molding of the preform as the first production stage enables an optimal design of suitable assembly engagement means on an area of the preform which later forms the mouth of the bottle in order to be able to mount a closure element for closing a pouring opening.
  • a closure element for closing a pouring opening Usually it is a screw thread that is formed on the outer circumference of the preform.
  • the invention has for its object to provide a plastic injection molding of the generic type that enables the manufacture of containers, such as containers, bottles or the like., which are free from the problems previously existing with the assembly intervention means to be provided.
  • the invention resolves the aforementioned problems in known beverage containers in a surprisingly simple manner in that the assembly-engaging means on the container side are provided on the inner circumference side of the plastic injection-molded part or preforms.
  • a container can be formed which, if desired, can also be completely smooth on the outside of the neck, which contains the pouring opening.
  • the smooth outer shape of the preform in areas that later form the neck area of the container facilitates precise position fixing and temperature control during the blow molding process.
  • the invention furthermore relates to a container with a closure element produced using a plastic injection molding or preform according to the invention.
  • the plastic injection molding hereinafter referred to as preform for short, bears the general reference number 1 in the drawing and, as shown, comprises a tubular base body 2, which is closed at one axial end by a curved end wall 3.
  • the opposite axial end of the base body 2 is open and creates a circular access opening to the interior of the preform.
  • a screw thread 4 is formed on an inner circumferential area of the preform near its open end and can cooperate with a complementary screw thread 5 on the outside of a circumferential wall 6 of a closure element 7.
  • the peripheral wall 6 is part of a cup-shaped area 8 of the closure element 7, which can be inserted into the preform from the open end.
  • an edge region 9 which encompasses the open end between an outer edge 10 which extends circumferentially of the open end and the screw thread 4 which, in the present embodiment, is smooth both on the inside and the outside.
  • a region 11 of the peripheral wall 6 can also have an outer dimension which is adapted to the inner dimension of the edge region 9 of the preform 1 such that a sealing relationship is established between the adjacent surfaces of the two regions 9, 11 when the closure element 7 is mounted in the manner shown in the drawing.
  • the closure element 7 can furthermore comprise an actuation area 12 arranged at a radial distance from the edge area 10, which overlaps the edge area 9 of the preform 1 and with the fingers of one hand Person. Can be detected in order to exert a rotational force in one or the other direction on the closure element 7.
  • the outer surface of the actuation area 12 can have a corrugation or another suitable texture that makes it easier to put the fingers on.
  • the inner and outer circumferential dimensions of the preform, at least at the sections which include the screw thread 4 and the edge region 9, essentially correspond to those of a neck region of a bottle or a container to be produced from the preform.
  • the preform 1 is manufactured by injection molding a suitable plastic, such as a polyolefin, using techniques known to those skilled in the art, the screw thread 4 being formed completely.
  • the preform 1 is then subjected to a further shaping in a subsequent production step in a blow molding machine according to techniques which are also fundamentally known, in that those areas of the preform 1 which are to undergo radial expansion in accordance with the volume of the bottle or container are heated and in a blow mold Blown compressed air can be expanded.
  • the area of the preform 1, which carries the screw thread 4 and has the edge area 9 must not undergo any radial expansion, so that the screw thread 4 and the edge area 9 are retained during the blow molding process.
  • the closure element 7 can also be formed from a suitable plastic by injection molding. Because of the formation of the screw thread 5 on the outer circumference of the closure element 7, its removal from an injection mold is facilitated compared to closures of a known type with a screw thread provided on the inside.
  • a bottle or container formed using the preform can have a continuously smooth outer surface. If desired, as shown, at a suitable intermediate location between the open end and the end wall 3, for example near the edge area 9, on An outer circumference of the preform 1 can be provided with a collar 13 which serves to transport the preform 1 from a
  • assembly engagement means are designed in the form of a screw thread
  • assembly engagement means in the form of locking projections or locking collars can also be provided on the inner circumference of the preform, which engage in locking engagement with complementary locking means on Locking element can kick.
  • substantially tubular with respect to the configuration of the base body of the preform also includes one that is, for example, pear-shaped.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

The invention relates to a plastic injection molded part (1), which enables a subsequent shaping by blow molding into a receptacle, such as a container, a bottle or the like, comprising an essentially tubular base body (2), which is open at one end and which has a termination wall (3) at the end opposite the open end. The plastic injection molded part also comprises first engaging mounting means (4), which are shaped on a circumferential area of the base body at or near the open end. Said engaging mounting means are provided for mounting a closure element (7), which has complementary second engaging mounting means (5), whereby the first engaging mounting means (4) are provided on the inner circumference of the base body.

Description

Kunststoff-Spritzgiessteil, sowie Behältnis, hergestellt durch Blasformen des Kunststoff-SpritzgiessteilesPlastic injection molded part, and container, produced by blow molding the plastic injection molded part

Die Erfindung betrifft ein Kunststoff-Spritzgiessteil, welches eine nachträgliche Formung durch Blasformen zu einem Behältnis, wie ein Behälter, eine Flasche oder dgl. ermöglicht, sowie ein derartiges Behältnis, hergestellt durch Blasformen des Kunststoff-Spritzgiessteiles.The invention relates to a plastic injection molded part, which enables subsequent shaping by blow molding into a container, such as a container, a bottle or the like, and to a container of this type, produced by blow molding the plastic injection molded part.

In der Getränkeindustrie ist es bekannt, gattungsgemässe Kunststoff- Spritzgiessteile, auch als Preform bezeichnet, als Zwischenprodukt für die Herstellung von Getränkeflaschen aus Kunststoff vorzusehen. Die Fertigung der Getränkeflasche erfolgt demnach in einem zweistufigen Verfahren, indem zunächst der Preform durch Spritzgiessen eines geeigneten Kunststoffmaterials gebildet und im Anschluss daran der Preform unter Anwendung einer dem Fachmann bekannten Blasformtechnik in die endgültige Flaschenform ausgeformt wird. Das Spritzgiessen des Preforms als erste Fertigungsstufe ermöglicht eine optimale Ausgestaltung von geeigneten Montageeingriffsmitteln an einem Bereich des Preforms, der später den Mündungshals der Flasche bildet, um ein Verschlusselement zum Verschliessen einer Ausgiessöffnung montieren zu können. Zumeist handelt sich um ein Schraubgewinde, das am äusseren Umfang des Preforms ausgebildet wird. Es hat sich gezeigt, dass durch die bekannten Montageeingriffsmittel nicht nur das Aufdrucken oder Aufkleben von Werbehinweisen auf den Flaschen auf bestimmte Flaschenbereiche begeschränkt werden muss und der Vorgang insgesamt beeinträchtigt wird, sondern es werden auch die Montageeingriffsmittel, da es sich um vorspringende Ausformungen handelt, vom Verbraucher oftmals als störend empfunden, wenn sie in Berührung mit den Lippen gelangen und ein bündigen Anliegen der Lippen am Mündungshals zum Zwecke des Entleerens der Flasche verhindern. Ausserdem wirken sich allgemein die Montageeingriffsmittel störend auf die aussere ästhetische Erscheinungsform der Flasche aus. Ferner wird beim Blasformschritt die Fxierung und thermische Kontrolle desjenigen Bereichs des Preforms erschwert, der den Mündungshals des zu formenden Behältnisses bilden soll und daher am Blasformvorgang nicht beteiligt werden darf.In the beverage industry, it is known to provide generic plastic injection molded parts, also referred to as preforms, as an intermediate for the manufacture of plastic beverage bottles. The beverage bottle is therefore produced in a two-stage process, in which the preform is first formed by injection molding a suitable plastic material and then the preform is shaped into the final bottle shape using a blow molding technique known to the person skilled in the art. The injection molding of the preform as the first production stage enables an optimal design of suitable assembly engagement means on an area of the preform which later forms the mouth of the bottle in order to be able to mount a closure element for closing a pouring opening. Mostly it is a screw thread that is formed on the outer circumference of the preform. It has been shown that not only the printing or gluing of Advertising notices on the bottles have to be restricted to certain bottle areas and the process as a whole is impaired, but the assembly intervention means, since they are protruding shapes, are often perceived by the consumer as annoying when they come into contact with the lips and flush Prevent lips from touching the neck of the mouth to empty the bottle. In addition, the assembly intervention means generally have a disruptive effect on the external aesthetic appearance of the bottle. Furthermore, in the blow molding step, the fixing and thermal control of that area of the preform that is to form the neck of the mouth of the container to be molded and therefore must not be involved in the blow molding process is made more difficult.

Der Erfindung liegt die Aufgabe zugrunde, ein Kunststoff-Spritzgiessteil der gattungsgemässen Art zu schaffen, das die Fertigung von Behältnissen, wie Behälter, Flaschen oder dgl. ermöglicht, die frei von den mit den vorzusehenden Montageeingriffsmittel bislang bestehenden Problemen sind.The invention has for its object to provide a plastic injection molding of the generic type that enables the manufacture of containers, such as containers, bottles or the like., Which are free from the problems previously existing with the assembly intervention means to be provided.

Diese Aufgabe wird erfindungsgemäss durch die Merkmale des Anspruchs 1 gelöst. Durch die Erfindung werden die genannten Probleme bei bekannten GetränkeBehältnissen in überraschend einfacher Weise dadurch behoben, dass die fbehältniseitigen Montageeingriffsmittel innenumfangsseitig des Kunststoff-Spritzgiessteiles oder Preforms vorgesehen sind. Dadurch kann ein Behältnis geformt werden, das, wenn erwünscht, auch am Halsbereich, der die Ausgiessöffnung enthält, vollkommen aussen glatt ausgebildet sein kann. Insbesondere fehlen nahe der Ausgiessöffnung nach aussen vorspringende Ausformungen wie ein Schraubgewinde oder Rastbünde, mittels denen bislang eine Verschlusskappe am Behältnis montiert werden musste. Gleichzeitig erleichtert die glatte aussere Ausbildung des Preforms an Bereichen, die später den Halsbereich des Behältnisses bilden, eine genaue Lagefixierung und Temperatursteuerung während des Blasformvorganges. Gegenstand der Erfindung ist ferner ein unter Verwendung eines erfindungsgemässen Kunststoff-Spritzgiessteiles oder Preforms hergestelltes Behältnis mit Verschlusselement.According to the invention, this object is achieved by the features of claim 1. The invention resolves the aforementioned problems in known beverage containers in a surprisingly simple manner in that the assembly-engaging means on the container side are provided on the inner circumference side of the plastic injection-molded part or preforms. As a result, a container can be formed which, if desired, can also be completely smooth on the outside of the neck, which contains the pouring opening. In particular, there are no protruding protrusions near the pouring opening, such as a screw thread or locking collars, which previously had to be used to mount a closure cap on the container. At the same time, the smooth outer shape of the preform in areas that later form the neck area of the container facilitates precise position fixing and temperature control during the blow molding process. The invention furthermore relates to a container with a closure element produced using a plastic injection molding or preform according to the invention.

Die Erfindung wird nachfolgend an Hand einer Ausführungsform näher erläutert, die in der Zeichnung in längsgeschnittener Ansicht zusammen mit einer Ausführungsform eines geeigneten Verschlusselementes gezeigt ist.The invention is explained in more detail below on the basis of an embodiment which is shown in the drawing in a longitudinal section together with an embodiment of a suitable closure element.

Das Kunststoff-Spritzgiessteil, im Folgenden kurz Preform genannt, trägt in der Zeichnung das allgemeine Bezugszeichen 1 und umfasst wie dargestellt, einen rohrförmigen Basiskörper 2, der an einem axialen Ende durch eine gewölbte Abschlusswand 3 verschlossen ist. Das gegenüberliegende axialen Ende des Basisköroers 2 ist offen und schafft eine kreisförmige Zutrittsöffnung zum Inneren des Preforms. An einem inneren Umfangsbereich des Preforms nahe dessen offenen Ende ist ein Schraubgewinde 4 ausgebildet, das mit einem komplementären Schraubgewinde 5 an der Aussenseite einer Umfangswand 6 eines Verschlusseselementes 7 zusammenwirken kann. Die Umfangswand 6 ist Teil eines napfförmigen Bereiches 8 des Verschlusseselementes 7, der seitens des offenen Endes in den Preform eingeführt werden kann.The plastic injection molding, hereinafter referred to as preform for short, bears the general reference number 1 in the drawing and, as shown, comprises a tubular base body 2, which is closed at one axial end by a curved end wall 3. The opposite axial end of the base body 2 is open and creates a circular access opening to the interior of the preform. A screw thread 4 is formed on an inner circumferential area of the preform near its open end and can cooperate with a complementary screw thread 5 on the outside of a circumferential wall 6 of a closure element 7. The peripheral wall 6 is part of a cup-shaped area 8 of the closure element 7, which can be inserted into the preform from the open end.

Am Preform 1 ist ferner ein das offene Ende umfassender Randbereich 9 zwischen einer äusseren Randkante 10, die sich umfänglich des offenen Endes erstreckt, und dem Schraubgewinde 4 vorgesehen, der bei der vorliegenden Ausführungsform sowohl innen- als auch aussenumfänglich glatt ausgebildet ist. Am Verschlusselement 7 kann ferner ein Bereich 11 der Umfangswand 6 eine aussere Abmessung haben, die der inneren Abmessung des Randbereiches 9 des Preforms 1 so angepasst ist, dass zwischen den benachbarten Oberflächen der beiden Bereichen 9, 11 eine abdichtende Beziehung zustande kommt, wenn das Verschlusselement 7 in der in der Zeichnung gezeigten Weise montiert ist.On the preform 1 there is further provided an edge region 9 which encompasses the open end between an outer edge 10 which extends circumferentially of the open end and the screw thread 4 which, in the present embodiment, is smooth both on the inside and the outside. On the closure element 7, a region 11 of the peripheral wall 6 can also have an outer dimension which is adapted to the inner dimension of the edge region 9 of the preform 1 such that a sealing relationship is established between the adjacent surfaces of the two regions 9, 11 when the closure element 7 is mounted in the manner shown in the drawing.

Das Verschlusselement 7 kann ferner einen in radialem Abstand zum Randbereich 10 angeordneten Betätigungsbereich 12 umfassen, der den Randbereich 9 des Preforms 1 übergreifen und mit den Fingern einer Hand einer Person .erfasst werden kann, um auf das Verschlusselement 7 eine Drehkraft in die eine oder andere Richtung auszuüben.The closure element 7 can furthermore comprise an actuation area 12 arranged at a radial distance from the edge area 10, which overlaps the edge area 9 of the preform 1 and with the fingers of one hand Person. Can be detected in order to exert a rotational force in one or the other direction on the closure element 7.

Der aussere Oberfläche des Betätigungsbereiches 12 kann eine Riffelung oder eine andere geeignete Textur, die das Anlegen der Finger erleichtert, aufweisen.The outer surface of the actuation area 12 can have a corrugation or another suitable texture that makes it easier to put the fingers on.

Die inneren und äusseren umfänglichen Abmessungen des Preforms, wenigstens an den Abschnitten, die das Schraubgewinde 4 und den Randbereich 9 einschliessen, entsprechen im Wesentlichen denjenigen eines Halsbereiches einer aus dem Preform zu fertigenden Flasche oder eines Behälters. Der Preform 1 wird durch Spritzgiessen eines geeigneten Kunststoffes, wie eines Polyolefines, nach dem Fachmann bekannten Techniken gefertigt, wobei das Schraubgewinde 4 vollständig ausgebildet wird. Der Preform 1 wird anschliessend in einem nachfolgenden Fertigungsschritt in einer Blasformmaschine nach ebenfalls grundsätzlich bekannten Techniken einer weiteren Ausformung unterworfen, indem diejenige Bereiche des Preforms 1 , die eine radiale Ausdehnung entsprechend dem Volumen der Flasche oder des Behälters erfahren sollen, erwärmt und in einer Blasform mittels Blasdruckluft aufgeweitet werden. Bei diesem Vorgang darf der Bereich des Preforms 1 , der das Schraubgewinde 4 trägt und den Randbereich 9 aufweist, keine radiale Erweiterung erfahren, so dass das Schraubgewinde 4 und der Randbereich 9 beim Blasformvorgang erhalten bleiben.The inner and outer circumferential dimensions of the preform, at least at the sections which include the screw thread 4 and the edge region 9, essentially correspond to those of a neck region of a bottle or a container to be produced from the preform. The preform 1 is manufactured by injection molding a suitable plastic, such as a polyolefin, using techniques known to those skilled in the art, the screw thread 4 being formed completely. The preform 1 is then subjected to a further shaping in a subsequent production step in a blow molding machine according to techniques which are also fundamentally known, in that those areas of the preform 1 which are to undergo radial expansion in accordance with the volume of the bottle or container are heated and in a blow mold Blown compressed air can be expanded. In this process, the area of the preform 1, which carries the screw thread 4 and has the edge area 9, must not undergo any radial expansion, so that the screw thread 4 and the edge area 9 are retained during the blow molding process.

Das Verschlusselement 7 kann aus einem geeigneten Kunststoff ebenfalls durch Spritzgiessen gebildet werden. Wegen der Ausbildung des Schraubgewindes 5 am äusseren Umfang des Verschlusselementes 7 wird dessen Entformung aus einer Spritzgiessform gegenüber Verschlüssen bekannter Art mit innenumfänglich vorgesehenem Schraubgewinde erleichtert.The closure element 7 can also be formed from a suitable plastic by injection molding. Because of the formation of the screw thread 5 on the outer circumference of the closure element 7, its removal from an injection mold is facilitated compared to closures of a known type with a screw thread provided on the inside.

Eine unter Verwendung des Preforms gebildete Flasche oder ein Behälter kann eine durchgehend glatte aussere Oberfläche haben. Wenn erwünscht, kann wie dargestellt, an einer geeigneten zwischenliegenden Stelle zwischen dem offenen Ende und der Abschlusswand 3, z.B. nahe dem Randbereich 9, am äusseren Umfang des Preforms 1 ein Bund 13 vorgesehen sein, der dazu dient, einen Transport des Preforms 1 von einerA bottle or container formed using the preform can have a continuously smooth outer surface. If desired, as shown, at a suitable intermediate location between the open end and the end wall 3, for example near the edge area 9, on An outer circumference of the preform 1 can be provided with a collar 13 which serves to transport the preform 1 from a

Fertigungsstufe zur nächsten sowie dessen weitere Bearbeitung in einer Blasformmaschine zu erleichtern.Manufacturing stage to the next and its further processing in a blow molding machine.

Obschon bei der vorbeschriebenen und in der Zeichnung gezeigten Ausführungsform der Erfindung die Montageeingriffsmittel Gestalt eines Schraubgewinde ausgebildet sind, können an Stelle davon auch rastend wirkende Montageeingriffsmittel in Gestalt von Rastvorprüngen oder Rastbunden am inneren Umfang des Preforms vorgesehen sein, die in rastendem Eingriff mit komplementären Rastmitteln am Verschlusselement treten können. Der Begriff „im Wesentlichen rohrförmig" in Bezug auf die Konfiguration des Basiskörpers des Preforms schliesst auch eine solche ein, die z.B. birnenförmig ist. Although in the embodiment of the invention described above and shown in the drawing, the assembly engagement means are designed in the form of a screw thread, assembly engagement means in the form of locking projections or locking collars can also be provided on the inner circumference of the preform, which engage in locking engagement with complementary locking means on Locking element can kick. The term “substantially tubular” with respect to the configuration of the base body of the preform also includes one that is, for example, pear-shaped.

Claims

Ansprüche Expectations 1. Kunststoff-Spritzgiessteil, welches eine nachträgliche Formung durch Blasformen zu einem Behältnis, wie ein Behälter, eine Flasche oder dgl. ermöglicht, mit einem im Wesentlichen rohrförmigen, einerends offenen Basiskörper (2) mit einer Abschlusswand (3) an dem dem offenen Ende gegenüberliegenden Ende und mit an einem Umfangsbereich des Basiskörpers an oder nahe bei dem offenen Ende angeformten ersten Eingriffsmontagemitteln (4) zur Montage eines Verschlusselementes (7), das komplementäre zweite Eingriffsmontagemitteln (5) aufweist, dadurch gekennzeichnet, dass die ersten Eingriffsmontagemittel (4) innenumfangsseitig des Basiskörpers (2) vorgesehen sind.1. Plastic injection molding, which enables subsequent shaping by blow molding into a container, such as a container, a bottle or the like, with a substantially tubular, one-sided open base body (2) with an end wall (3) at the open end opposite end and with on a circumferential region of the base body at or near the open end of the first engagement mounting means (4) for mounting a closure element (7) which has complementary second engagement mounting means (5), characterized in that the first engagement mounting means (4) on the inner circumference of the base body (2) are provided. 2. Kunststoff-Spritzgiessteil nach Anspruch 1 , dadurch gekennzeichnet, dass die Eingriffsmontagemittel (4,5) als Schraubeingriffsmittel ausgebildet sind.2. Plastic injection molding according to claim 1, characterized in that the engagement mounting means (4,5) are designed as screw engagement means. 3. Kunststoff-Spritzgiessteil nach Anspruch 1 , dadurch gekennzeichnet, dass die Eingriffsmontagemittel (4,5) ausgebildet sind, um in rastendem Eingriff miteinander zu treten.3. Plastic injection molding according to claim 1, characterized in that the engaging assembly means (4,5) are designed to engage in engagement with each other. 4. Kunststoff-Spritzgiessteil nach Anspruch 1 , 2 oder 3, dadurch gekennzeichnet, dass wenigstens ein das offene Ende umfassender Randbereich (9) des Basiskörpers (2) wenigstens aussenumfänglich glatt ausgebildet ist.4. Plastic injection molding according to claim 1, 2 or 3, characterized in that at least one edge region (9) of the base body (2) comprising the open end is at least smooth on the outside. 5. Behältnis, wie ein Behälter, eine Flasche oder dgl., hergestellt durch Blasformen unter Verwendung eines Kunststoff-Spritzgiessteiles (1) gemäss einem oder mehreren der Ansprüche 1 bis 4. 5. Container, such as a container, a bottle or the like, produced by blow molding using a plastic injection-molded part (1) according to one or more of claims 1 to 4. 6. Behältnis, nach Anspruch 5, dadurch gekennzeichnet, dass ein Verschlusselement (7) zum Verschliessen einer Ausgiessöffnung des Behältnisses vorgesehen ist, das einen in eine Ausgiessöffnung des Behältnisses einführbaren napfförmigen Bereich (8) aufweist, an dessen äusseren Umfang ein Schraubgewinde (5) oder Rastmittel zur Eingriffnahme mit einem komplementären Schraubgewinde (4) oder Rastmitteln an einem inneren Umfangsbereich des Behältnisses vorgesehen ist.6. A container according to claim 5, characterized in that a closure element (7) is provided for closing a pouring opening of the container, which has a cup-shaped area (8) that can be inserted into a pouring opening of the container, on the outer circumference of which a screw thread (5) or locking means for engaging with a complementary screw thread (4) or locking means is provided on an inner peripheral region of the container. 7. Behältnis nach Anspruch 6, dadurch gekennzeichnet, dass das Verschlusselement (7) einen einen Randbereich (9) des Behältnisses nahe dessen Ausgiessöffnung aussenumfänglich umgreifenden Betätigungsbereich (12) aufweist. 7. Container according to claim 6, characterized in that the closure element (7) has an edge region (9) of the container near its pouring opening, which encompasses the outer periphery of the actuation region (12).
PCT/EP2004/008917 2003-09-15 2004-08-10 Plastic injection molded part and receptacle produced by blow molding the plastic injection molded part Ceased WO2005028186A1 (en)

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