DE3008883A1 - TUBULAR ROLLING OF SYNTHETIC RESIN FOR SHAPING A BOTTLE-SHAPED CONTAINER - Google Patents

TUBULAR ROLLING OF SYNTHETIC RESIN FOR SHAPING A BOTTLE-SHAPED CONTAINER

Info

Publication number
DE3008883A1
DE3008883A1 DE19803008883 DE3008883A DE3008883A1 DE 3008883 A1 DE3008883 A1 DE 3008883A1 DE 19803008883 DE19803008883 DE 19803008883 DE 3008883 A DE3008883 A DE 3008883A DE 3008883 A1 DE3008883 A1 DE 3008883A1
Authority
DE
Germany
Prior art keywords
blank
bottle
synthetic resin
tubular
diameter
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
DE19803008883
Other languages
German (de)
Inventor
Fumio Negishi
Akiho Ota
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.)
Yoshino Kogyosho Co Ltd
Original Assignee
Yoshino Kogyosho Co Ltd
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 Yoshino Kogyosho Co Ltd filed Critical Yoshino Kogyosho Co Ltd
Publication of DE3008883A1 publication Critical patent/DE3008883A1/en
Ceased legal-status Critical Current

Links

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
    • B29C45/36—Moulds having means for locating or centering cores
    • 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
    • B29C49/071—Preforms or parisons characterised by their configuration, e.g. geometry, dimensions or physical properties
    • 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
    • B29C2949/072—Preforms or parisons characterised by their configuration having variable wall thickness
    • B29C2949/0724—Preforms or parisons characterised by their configuration having variable wall thickness 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
    • B29C2949/07—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
    • B29C2949/073—Preforms or parisons characterised by their configuration having variable diameter
    • B29C2949/0733—Preforms or parisons characterised by their configuration having variable diameter 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
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/073—Preforms or parisons characterised by their configuration having variable diameter
    • B29C2949/0734—Preforms or parisons characterised by their configuration having variable diameter 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
    • 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
    • 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
    • B29C2949/078—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the bottom
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Description

33 15233 152

YOSHINO KOGYOSHO CO., LTD.
Tokyo / JAPANYOSHINO KOGYOSHO CO., LTD.
Tokyo / JAPAN

Rohrförmiger Rohling aus Kunstharz zum Formen eines flaschenförmigen BehältersTubular blank made of synthetic resin for molding a bottle-shaped container

Die Erfindung bezieht sich auf flaschenförmige Behälter aus Kunstharz und betrifft insbesondere einen rohrförmigen Rohling zum Formen eines solchen flaschenförmigen Behälters aus biaxial orientiertem Kunstharz.The invention relates to bottle-shaped containers made of synthetic resin and, more particularly, relates to a tubular blank for molding such a bottle-shaped container from biaxially oriented synthetic resin.

Eine Flasche aus Kunstharz wie etwa gesättigtem Polyester besitzt die Vorteile, daß sie angreifenden Substanzen wie Lösungsmittel oder dergleichen gegenüber dicht bleibt und keine toxischen Gase entstehen läßt, wenn sie nach dem Wegwerfen verbrannt wird. Die Flasche ist üblicherweise biaxial orientiert und so geformt, daß die mechanische Festigkeit ihres Materials unterstützt wird. Es ist günstig, für das Ausformen einer derart biaxial orientierten Flasche einen rohrförmigen Rohling (oder Kaltrohling) aus Kunstharz herzustellen, der an einem Ende einen Boden und am anderen Ende eine obere öffnung besitzt, und dies in einem Vorausarbextsgang durch ein Injektionsformverfahren durchzuführen, diesen rohrförmigen Rohling dann auf eine für die Orientierung geeignete Temperatur zu erhitzen und ihn dann in einer Blasform biaxial auszurichten.A bottle made of synthetic resin such as saturated polyester has the advantages of being harmful to substances such as solvents or the like remains sealed against and does not allow toxic gases to develop if they are discarded is burned. The bottle is usually biaxially oriented and shaped to increase the mechanical strength of its material is supported. It is favorable for the molding of such a biaxially oriented bottle to have a tubular shape To produce a blank (or cold blank) from synthetic resin, which has a bottom at one end and an upper opening at the other end owns, and this in a pre-painting process through an injection molding process carry out, this tubular blank then to a suitable temperature for the orientation heat and then biaxially align it in a blow mold.

Um von dem rohrförmigen Rohling eine Flasche mit besonders hoher Festigkeit wie durch biaxiale Orientierung zu erhalten,In order to obtain a bottle with particularly high strength from the tubular blank, such as by biaxial orientation,

030045/0607030045/0607

ist" es nötig, die Dicke des Teils, der aus dem rohrförmigen Rohling orientiert werden soll, praktisch gleichmäßig zu machen. Wenn der rohrförmige Rohling an einer Seitenwand dick und an der anderen Seitenwand dünn geformt ist, dann wird auch die Flasche, die aus diesem rohrförmigen Rohling geformt wird, ähnlich in ihrer Dicke oder Wandstärke geformt sein, also ein unregelmäßiges Profil haben, so daß die fertige Flasche ihre Festigkeit verliert.is "it is necessary to determine the thickness of the part that comes from the tubular The blank should be oriented to make it practically uniform. When the tubular blank is thick on one side wall and on the other side wall is thinly formed, then the bottle, which is formed from this tubular blank, is also formed will be shaped similar in their thickness or wall thickness, so have an irregular profile, so that the finished bottle loses its solidity.

Ein herkömmlicher Rohling 1, der in der Fig. 1 gezeigt ist, ist an seiner Innenwand des Bodens 2 halbkugelförmig wie bei 3 gestaltet. Dieser Rohling 1 weist einen zylindrisch geformten Rumpfteil 4 auf, an dessen oberen Ende sich ein Halsabschnitt 5 mit Schraubgewindegängen 6 befindet. In der Mitte der Bodenwand 2 bleibt vom Spritzformverfahren ein Eingußstumpf 7 erhalten. Der rohrförmige Rohling 1 wird dadurch erhalten, daß, wie es die Fig. 2 zeigt, in einen Formhohlraum einer Spritzgußform 8 ein Kern 10 eingesetzt und dann durch eine Einguß- oder Einspritzöffnung 11 in der Mitte des Bodens des Formhohlraums 9 geschmolzenes Harzmaterial eingespritzt wird. Das untere Ende des Kerns 10 ist halbkugelförmig, wie bei 12 gezeigt, entspricht also der Form der Innenwand des Bodenbereichs des fertigen Rohlings 1. Das geschmolzene Harzmaterial, das in den Hohlraum eingedrückt wird, legt sich mit Druck an die Außenfläche des Kerns an und erfüllt den Zwischenraum zwischen der Form 8 und dem Kern 10.A conventional blank 1, which is shown in Fig. 1, is hemispherical on its inner wall of the bottom 2 as at 3 designed. This blank 1 has a cylindrically shaped body part 4, at the upper end of which there is a neck section 5 with screw threads 6 is located. In the middle of the bottom wall 2, a sprue remains from the injection molding process 7 received. The tubular blank 1 is obtained in that, as FIG. 2 shows, in a mold cavity an injection mold 8, a core 10 is inserted and then through a gate or injection opening 11 in the center of the bottom of the mold cavity 9, molten resin material is injected. The lower end of the core 10 is hemispherical, like shown at 12, thus corresponds to the shape of the inner wall of the bottom region of the finished blank 1. The molten resin material, which is pressed into the cavity, presses against the outer surface of the core and fills the gap between the mold 8 and the core 10.

Wenn die Achsen des Hohlraums 9 der Form '8 und des Kerns 10 in diesem Augenblick nicht genau übereinstimmen, dann wird die Wandstärke des Rohlings ungleichmäßig. Befindet sich die Einspritzöffnung 11 nicht auf der Achse des Kerns 10, dann strebt der Kern 10 eine Neigung seiner Achse gegenüber der Achse des Formhohlraums 9 aufgrund des Einspritzdruckes des geschmolzenen Harzes an, da der Kern 10 lang ist» so daß dadurch der Rohling ungleichmäßige Wandstärke erhält.When the axes of the cavity 9 of the mold '8 and the core 10 do not match exactly at that moment, then the wall thickness of the blank becomes uneven. Is the Injection port 11 not on the axis of the core 10, then the core 10 seeks an inclination of its axis relative to the axis of the mold cavity 9 due to the injection pressure of the molten resin, since the core 10 is long »so that the blank has an uneven wall thickness.

030045/0607030045/0607

Der Erfindung liegt deshalb die Aufgabe zugrunde, einen rohrförmigen Rohling für das Formen flaschenartiger Behälter aus biaxial orientiertem Kunstharz zu schaffen, bei dem keine Gefahr besteht, daß ungleichmäßig dicke Wände entstehen. Bei
einem derartigen Behälter soll die Mittelachse des Formkerns von der Mittelachse der Spritzgußform nicht abweichen, damit keine ungleichmäßigen Wandstärken entstehen, denn dadurch
kann aus dem Rohling ein Behälter geformt werden, der aufgrund seiner überall gleichen Wandstärke besonders hohe mechanische Festigkeit besitzt.The invention is therefore based on the object of creating a tubular blank for the molding of bottle-like containers made of biaxially oriented synthetic resin, in which there is no risk of unevenly thick walls. at
In such a container, the central axis of the mold core should not deviate from the central axis of the injection mold, so that no uneven wall thicknesses arise because of this
a container can be formed from the blank, which has particularly high mechanical strength due to its wall thickness being the same everywhere.

Die Lösung dieser Aufgabe geht aus dem Patentanspruch hervor und wird besonders deutlich anhand der nachfolgenden Beschreibung von Ausführungsbeispielen anhand der Zeichnung. Im einzelnen zeigen darin:The solution to this problem emerges from the patent claim and becomes particularly clear on the basis of the following description of exemplary embodiments based on the drawing. In it show in detail:

Fig. 1 eine Längsschnittdarstellung eines herkömmlichen rohrförmigen Rohlings;Fig. 1 is a longitudinal sectional view of a conventional tubular blank;

Fig. 2 einen Auschnitt aus einer Axialschnittdareteilung der Spritsgußform für einen herkömmlichen Rohling nach Fig. Ί; · FIG. 2 shows a detail from an axial section representation of the injection mold for a conventional blank according to FIG. ·

Fig. 3 einen axialen Längsschnitt durch einen rohrförmigen Rohling in Ausbildung nach der Erfindung;3 shows an axial longitudinal section through a tubular blank formed according to the invention;

flg. 4 einen Ausschnitt aus der tun Rohling nach Fig. 3 gehörenden SpritzguBfortnjflg. 4 shows a section from the blank according to FIG. 3 belonging to SpritzguBfortnj

Fig. 5 einen Axialschnitt durch «in abgewandeltes Ausführungsbeispiel des Rohlings nach der Erfindung!Fig. 5 is an axial section through «in a modified embodiment of the blank according to the invention!

Fig. 6 einen Ausschnitt aus der Spritrgußforn für den Rohling nach Fig. 5} undFig. 6 shows a section of the Spritrgußforn for Blank according to Fig. 5} and

030045/060?030045/060?

Fig. 7 einen Ausschnitt aus der Axialschnittdarstellung7 shows a detail from the axial sectional illustration

einer Spritzgußform für einen dritten Rohling in erfindungsgemäßer Gestaltung.an injection mold for a third blank in a design according to the invention.

Der in der Fig. 3 gezeigte rohrförmige Rohling 21 besitzt eine Bodenwand 22, die zur Längsachse des Rohlings 21 an ihrer Innenfläche senkrecht gerichtet ist. Diese senkrechte Wandfläche 23 auf der Innenseite der Bodenwand 22 hat einen größeren Durchmesser als der auf der Bodenaußenwand nach dem Formen verbliebene Eingußstumpf 27.The tubular blank 21 shown in FIG. 3 has a bottom wall 22 which is directed perpendicular to the longitudinal axis of the blank 21 on its inner surface. This vertical Wall surface 23 on the inside of the bottom wall 22 has a larger diameter than that on the bottom outer wall after Molds remaining sprue stump 27.

Ein Blick auf die Fig. 3 zeigt, daß das Außenprofil des unteren Abschnitts des Rohlingrumpfes 24 im wesentlichen halbkugelförmig »aber auch, wie es die Fig. 5 zeigt, kegeistumpfföririig sein kann, wobei der Außendurchmesser des Bodens dann kleiner als der Durchmesser des oberen Rumpfteils ist.A look at Fig. 3 shows that the outer profile of the lower portion of the blank body 24 is substantially hemispherical “But also, as Fig. 5 shows, truncated cone can be, wherein the outer diameter of the bottom is then smaller than the diameter of the upper body part.

Um einen solchen rohrförmigen Rohling zu formen, besitzt der in den Formhohlraum eingesetzte Kern 30 eine zu seiner Längsachse senkrecht verlaufende Bodenfläche, wie die Figuren 4, 6 und 7 zeigen, wobei diese horizontale Bodenfläche 32 einen Durchmesser hat, der größer als die öffnung 31 in der Form ist.In order to form such a tubular blank, the core 30 inserted into the mold cavity has a longitudinal axis to it perpendicular bottom surface, as shown in FIGS. 4, 6 and 7, this horizontal bottom surface 32 being a Has diameter which is larger than the opening 31 in the form.

Wenn die Form 28 und der Kern 30 derart ausgebildet sind, trifft das durch die Einspritzöffnung 31 in den Formhohlraum 29 eingespritzte geschmolzene Harz auf die horizontale Bodenfläche 32 des Kerns 30 und breitet sich dann nach allen Seiten entlang der horizontalen Bodenfläche 32 so aus, daß es den Formhohlraum 29 ausfüllt.If the mold 28 and the core 30 are formed in this way, this occurs through the injection opening 31 into the mold cavity 29 injected molten resin onto the horizontal bottom surface 32 of the core 30 and then spreads to all Sides along the horizontal bottom surface 32 so that it fills the mold cavity 29.

Man muß dabei verstehen, daß bei einer gemäß der vorangehenden Beschreibung gewählten Gestaltung des rohrförmigen Rohlings mit senkrecht zur Längsachse gerichteten inneren Bodenwandfläche 23, deren Durchmesser größer als der Eingußstumpf 27 auf der äußeren Bodenwandfläche ist, das durch dieIt must be understood that in a chosen configuration of the tubular blank in accordance with the preceding description with an inner bottom wall surface 23 directed perpendicular to the longitudinal axis, the diameter of which is larger than the sprue 27 is on the outer bottom panel, which is represented by the

030046/0607030046/0607

Einspritzöffnung hineingedrückte geschmolzene Harzmaterial zunächst auf die horizontal liegende Bodenwandfläche 32 des Kerns 30 trifft und dann sich entlang dieser horizontalen Fläche nach allen Seiten gleichmäßig ausbreitet, um den Hohlraum auszufüllen, woraus sich ergibt, daß der Kern durch den Injektionsdruck des geschmolzenen Harzmaterials nicht ungleichmäßig in irgendeine Richtung gedrückt wird und seine Achse dadurch sich aus der Richtung und Lage der Mittelachse des Formhohlraums verschieben könnte, wie dies bei dem Spritzformvorgang herkömmlicher Rohlinge leicht geschieht, so daß die herkömmlichen Rohlinge dann ungleichmäßige Wandstärken bekommen. Man versteht daraus auch, daß die rohrförmigen Rohlinge, die dann durch biaxiale Orientierung im Blasformverfahren in flaschenförmige Behälter ausgeformt werden, zu Behältern mit sehr guten und gleichförmigen mechanischen Eigenschaften führen, da die Wände dieser Behälter allseitig gleich stark sind.Injected molten resin material first onto the horizontally lying bottom wall surface 32 of the injection port Core 30 meets and then spreads evenly along this horizontal surface in all directions, around the cavity As a result, the core is not unevenly due to the injection pressure of the molten resin material is pressed in any direction and its axis is thereby different from the direction and position of the central axis of the mold cavity could move, as in the injection molding process conventional blanks happens easily, so that the conventional blanks then uneven wall thicknesses receive. It is also understood from this that the tubular blanks, which are then produced by biaxial orientation in the blow molding process be molded into bottle-shaped containers, to containers with very good and uniform mechanical properties lead, as the walls of these containers are equally strong on all sides.

Es ist demnach mit der Erfindung ein.rohrförmiger Rohling für das Ausformen von flaschenförmigen Behältern aus biaxial orientiertem Kunstharzmaterial geschaffen, der in vorteilhafter Weise mit gleichmäßiger Wandstärke ausgeformt werden kann, und zwar mit Hilfe einer Form mit einer Einspritzöffnung und einem günstig gestalteten Kern. Der daraus erhaltene Rohling hat besonders gute mechanische Festigkeit.It is therefore a tubular blank for the invention created the molding of bottle-shaped containers from biaxially oriented synthetic resin material, which in advantageous Way can be molded with a uniform wall thickness, with the help of a mold with an injection port and a well-designed core. The blank obtained therefrom has particularly good mechanical strength.

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L β β r s e i t eL β β r s e i t e

Claims (4)

YOSHINO KOGYOSHO CO., LTD.
Tokyo / JAPANYOSHINO KOGYOSHO CO., LTD.
Tokyo / JAPAN Rohrförmiger Rohling aus Kunstharz zum Formen eines flaschen-Tubular blank made of synthetic resin for forming a bottle förmigen Behältersshaped container PatentansprücheClaims Rohrförmiger Rohling aus Kunstharz zum Formen eines biaxial orientierten/ flaschenförmigen Behälters mit einem Boden und einer oberen öffnung in Zylinderform und mit einem Eingußstumpf in der Mitte der Bodenaußenfläche/ dadurch gekennzeichnet, daß eine innere Bodenwandfläche (23) rechtwinklig zur Behälterachse steht und ihr Durchmesser größer als der Durchmesser des Eingußstumpfes (27) ist.Tubular blank made of synthetic resin for molding a biaxially oriented / bottle-shaped container with a bottom and an upper opening in the shape of a cylinder and with a sprue in the middle of the bottom outer surface / characterized in that an inner bottom panel (23) perpendicular to the container axis and its diameter is greater than the diameter of the sprue stump (27). 2. Rohling nach Anspruch 1, dadurch gekennzeichnet, daß er aus gesättigtem Polyester besteht.2. Blank according to claim 1, characterized in that it consists of saturated polyester. 3. Rohling nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der untere Behälterabschnitt kegelstumpfförmig und der Außendurchmesser der Bodenaußenfläche (22) kleiner als der obere Rohlingsdurchmesser ist.3. Blank according to claim 1 or 2, characterized in that the lower container portion is frustoconical and the The outer diameter of the bottom outer surface (22) is smaller than the upper blank diameter. 4. Herstellung eines Kunstharzbehalters im Blasformverfahren durch biaxiales Orientieren des rohrförmigen Rohlings nach Anspruch 1.4. Manufacture of a synthetic resin container by blow molding by biaxially orienting the tubular blank of claim 1. 030045/0607030045/0607
DE19803008883 1979-05-01 1980-03-07 TUBULAR ROLLING OF SYNTHETIC RESIN FOR SHAPING A BOTTLE-SHAPED CONTAINER Ceased DE3008883A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5365179A JPS55146718A (en) 1979-05-01 1979-05-01 Intermediate blank made of synthetic resin for molding biaxially spread bottle

Publications (1)

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DE3008883A1 true DE3008883A1 (en) 1980-11-06

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DE19803008883 Ceased DE3008883A1 (en) 1979-05-01 1980-03-07 TUBULAR ROLLING OF SYNTHETIC RESIN FOR SHAPING A BOTTLE-SHAPED CONTAINER

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JP (1) JPS55146718A (en)
AU (1) AU541924B2 (en)
CA (1) CA1144727A (en)
CH (1) CH636298A5 (en)
DE (1) DE3008883A1 (en)
FR (1) FR2455507A1 (en)
GB (1) GB2048757B (en)
IT (1) IT1143079B (en)
NL (1) NL8001418A (en)

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US5573143A (en) * 1994-09-21 1996-11-12 Colgate-Palmolive Company Blow molded multi-chamber containers with dispenser/doser
US7897222B2 (en) * 2007-12-14 2011-03-01 Husky Injection Molding Systems Ltd. Preform and a mold stack for producing the preform
JP5286169B2 (en) * 2009-06-19 2013-09-11 株式会社青木固研究所 Stretch blow bottle preform
JP6043086B2 (en) * 2012-04-25 2016-12-14 凸版印刷株式会社 Preform for plastic bottles
DE102012108061A1 (en) * 2012-08-30 2014-03-06 Mht Mold & Hotrunner Technology Ag preform
ITMI20130115A1 (en) * 2013-01-25 2014-07-26 Concordia Dev Srl PREFORMATION OF PLASTIC MATERIALS WITH A LOW END CLOSED END
CN204249143U (en) 2014-03-21 2015-04-08 赫斯基注塑系统有限公司 container preform
GB2524728B (en) * 2014-03-28 2016-08-31 Gr8 Eng Ltd Injection molded preform and manufacture thereof
JP6647144B2 (en) 2015-12-11 2020-02-14 株式会社青木固研究所 Injection mold and preform molding method and preform of injection stretch blow molding machine, and container molding method and container
EP3817907B1 (en) * 2018-07-03 2024-08-21 Husky Injection Molding Systems Ltd. A preform and mold stack
FR3085294B1 (en) 2018-09-04 2023-01-20 Sidel Participations PREFORM FOR CONTAINER IN PLASTIC MATERIAL

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BE502508A (en) * 1950-04-15
DE1904753A1 (en) * 1969-01-31 1970-08-13 Rainer Fischer Method and device for producing hollow bodies from thermoplastic material
JPS509015B1 (en) * 1971-05-21 1975-04-09
DE2132674A1 (en) * 1971-07-01 1973-01-18 Siemag Siegener Maschb Gmbh METHOD AND APPARATUS FOR MANUFACTURING HOLLOW BODIES WITH A NECK PART, IN PARTICULAR BOTTLES MADE FROM THERMOPLASTIC PLASTIC
JPS531789B2 (en) * 1973-03-14 1978-01-21
US3949033A (en) * 1973-11-02 1976-04-06 Owens-Illinois, Inc. Method of making a blown plastic container having a multi-axially stretch oriented concave bottom
US4147748A (en) * 1976-07-23 1979-04-03 Saumsiegle Robert W Displacement blow-molding
JPS5333261A (en) * 1976-09-08 1978-03-29 Showa Yuka Kk Parison injection molding machine

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AU5613580A (en) 1980-11-06
FR2455507B1 (en) 1983-09-23
CH636298A5 (en) 1983-05-31
JPS55146718A (en) 1980-11-15
GB2048757B (en) 1983-05-18
AU541924B2 (en) 1985-01-31
GB2048757A (en) 1980-12-17
IT1143079B (en) 1986-10-22
FR2455507A1 (en) 1980-11-28
CA1144727A (en) 1983-04-19
NL8001418A (en) 1980-11-04
IT8048222A0 (en) 1980-03-21

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