DE10152393A1 - Thermoformed plastic container production from injection molded preforms involves stretch forming of wall areas and retention of other features at their original shape and size - Google Patents
Thermoformed plastic container production from injection molded preforms involves stretch forming of wall areas and retention of other features at their original shape and sizeInfo
- Publication number
- DE10152393A1 DE10152393A1 DE2001152393 DE10152393A DE10152393A1 DE 10152393 A1 DE10152393 A1 DE 10152393A1 DE 2001152393 DE2001152393 DE 2001152393 DE 10152393 A DE10152393 A DE 10152393A DE 10152393 A1 DE10152393 A1 DE 10152393A1
- Authority
- DE
- Germany
- Prior art keywords
- preform
- retention
- features
- size
- 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.)
- Withdrawn
Links
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B11/00—Making preforms
- B29B11/06—Making preforms by moulding the material
- B29B11/08—Injection moulding
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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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/02—Combined thermoforming and manufacture of the preform
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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
- B29C2791/00—Shaping characteristics in general
- B29C2791/004—Shaping under special conditions
- B29C2791/007—Using fluid under pressure
-
- 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
- B29C45/16—Making multilayered or multicoloured articles
-
- 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/04—Combined thermoforming and prestretching, e.g. biaxial stretching
-
- 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/10—Forming by pressure difference, e.g. vacuum
-
- 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
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7132—Bowls, Cups, Glasses
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren zum Herstellen von Kunststoff-Hohlkörpern gemäß dem Oberbegriff des Patentanspruchs 1. The invention relates to a method for manufacturing of plastic hollow bodies according to the preamble of Claim 1.
Ein derartiges Verfahren ist beispielsweise aus der DD-PS-58 373 und dem Artikel "Spritzgieß-Streckformen - ein Verfahren für die Fertigung dünnwandiger becherförmiger Formteile", Plaste und Kautschuk, 20. Jahrgang, Heft 11/1973, S. 834 bis 837 bekannt. Such a method is for example from DD-PS-58 373 and the article "Injection Molding - Process for manufacturing thin-walled cup-shaped Molded parts ", plastics and rubber, 20th year, issue 11/1973, Pp. 834 to 837 known.
Bei diesen bekannten Verfahren wird zunächst ein Vorformling in Form einer planparallelen Scheibe in einen Spritzgießvorgang gefertigt, und anschließend wird der Vorformling in einem Tiefziehvorgang zu dem Hohlkörper umgeformt, wobei der Rand des Vorformlings während des Tiefziehvorgangs festgehalten wird. In these known methods, a Preform in the form of a plane-parallel disc in one Injection molding process, and then the Preform formed into the hollow body in a deep-drawing process, the edge of the preform during the Thermoforming process is recorded.
Bei diesem Verfahren kann der Nachteil des Spritzgießens, daß nur relativ dickwandige Hohlkörper ausgebildet werden können, und der Nachteil des Tiefziehens, daß relativ viel Abfall auftritt, vermieden werden. With this method, the disadvantage of injection molding, that only relatively thick-walled hollow bodies are formed can, and the disadvantage of deep drawing that relatively much Waste occurs, be avoided.
Andererseits ist dieses Verfahren nur zur Herstellung von Hohlkörpern mit relativ einfacher Geometrie geeignet. On the other hand, this process is only for the production of Hollow bodies suitable with a relatively simple geometry.
Demgegenüber liegt der Erfindung die Aufgabe zugrunde, ein Verfahren der Eingangs genannten Art so weiter zu bilden, daß auch die Herstellung von Hohlkörpern mit komplexerer Geometrie möglich ist. In contrast, the invention is based on the object To further develop methods of the type mentioned at the beginning, that also the production of hollow bodies with more complex Geometry is possible.
Die Lösung dieser Aufgabe erfolgt durch ein Verfahren mit den Merkmalen des Patentanspruchs 1; die Unteransprüche betreffen vorteilhafte Weiterentwicklungen der Erfindung. This problem is solved by a method with the features of claim 1; the subclaims relate to advantageous developments of the invention.
Erfindungsgemäß wird vorgeschlagen, den Vorformling nicht als planparallele Platte zu fertigen, sondern bereits im Spritzgießvorgang Strukturelemente des zu fertigenden Hohlkörpers auszubilden, wobei diese Strukturelemente im Tiefziehvorgang im wesentlichen unverformt bleiben. Ein Beispiel für ein solches Strukturelement ist ein komplex ausgebildeter Boden oder Fußbereich eines Bechers. According to the invention, it is proposed that the preform not to produce as a plane-parallel plate, but already in Injection molding process structural elements to be manufactured Form hollow body, these structural elements in The deep-drawing process remains essentially undeformed. On An example of such a structural element is a complex one trained base or base area of a cup.
Wenn Kunststoff-Hohlkörper zur Verpackung von Nahrungsmitteln verwendet werden sollen, müssen die Innen- und Außenoberflächen gegebenenfalls unterschiedlichen Anforderungen genügen. Beispielsweise müssen die Innenflächen glatt sein, und aus dem Material der Innenfläche darf keine Substanz an das verpackte Lebensmittel abgegeben werden. Demgegenüber soll die Außenfläche leicht bedruck- oder beklebbar sein, und sie soll gegebenenfalls ein Dekor aufweisen. Diese Anforderungen können erfindungsgemäß dadurch erfüllt werden, daß der Vorformling aus mehreren Komponenten gespritzt wird. Dies kann beispielsweise in einem Zweikomponentenverfahren erfolgen, wobei eine Seite des Vorformlings eine erste Komponente aufweist, die andere Seite eine zweite Komponente, wobei die beiden Komponenten jeweils den Anforderungen hinsichtlich der Innenflächen bzw. Außenflächen eines zu fertigenden Hohlkörpers genügen. Auch ist es möglich, den Vorformling in einem Sandwichverfahren herzustellen, bei dem der Vorformling einen Innenkern mit einer Außenhaut aufweist. If plastic hollow body for packaging The food must be used both indoors and outdoors External surfaces may have different requirements suffice. For example, the inside surfaces have to be smooth, and no substance from the material of the inner surface the packaged food is delivered. In contrast, the outer surface should be easy to print or stick on, and if necessary it should have a decor. This According to the invention, requirements can be met by that the preform is injection molded from several components becomes. This can be done in one Two-component processes are carried out, one side of the preform being one has the first component, the other side a second Component, the two components each Requirements with regard to the inner and outer surfaces of a hollow body to be manufactured are sufficient. It is too possible to preform in a sandwich process to manufacture, in which the preform has an inner core with a Has outer skin.
Ausführungsbeispiele der Erfindung werden anhand der beigefügten Zeichnungen erläutert. Es zeigen: Embodiments of the invention are based on the attached drawings explained. Show it:
Fig. 1 einen Kunststoffhohlkörper in Seitendarstellung, Fig. 1 a plastic hollow body in side view,
Fig. 2 und 3 in Querschnittdarstellung einen Vorformling bzw. eine Form zur Herstellung eines Hohlkörpers in einem Zweikomponentenverfahren und Figs. 2 and 3 in cross-sectional representation of a preform and a mold for producing a hollow body in a two-component process and
Fig. 4 und 5 eine den Fig. 2 und 3 entsprechende Darstellung für die Herstellung eines Hohlkörpers im Sandwichverfahren. Fig. 4 and 5, FIGS. 2 and 3 corresponding representation for the production of a hollow body in the sandwich method.
Fig. 1 zeigt einen Kunststoff-Hohlkörper in Form eines Bechers, wie er beispielsweise zur Verpackung von Joghurt oder dergleichen gebräuchlich ist. Der Becher umfaßt einen Rand 1, eine Seitenwand 2, einen Boden 4 und einen Fußbereich 3. Fig. 1 shows a plastic hollow body in the form of a cup, such as is used for example for packaging yogurt or the like. The cup comprises an edge 1 , a side wall 2 , a bottom 4 and a foot region 3 .
Erfindungsgemäß wird in einem Spritzgießvorgang zunächst ein Vorformling (nicht dargestellt) hergestellt. Bei diesem Spritzgießvorgang werden vorzugsweise der Rand 1, der Fußbereich 3 und der Boden 4 bereits so wie beim fertigen Becher ausgebildet. Dies ist unproblematisch möglich, da die genannten Bereiche aus Gründen der Stabilität bzw. zur Befestigung eines Deckels relativ große Wanddicken haben dürfen. Dabei können die Bereiche 1, 3 und 4 im Prinzip beliebige, im Spritzgießvorgang herstellbare Konturen aufweisen. According to the invention, a preform (not shown) is first produced in an injection molding process. In this injection molding process, the edge 1 , the foot region 3 and the base 4 are preferably already formed as in the finished cup. This is possible without problems, since the areas mentioned may have relatively large wall thicknesses for reasons of stability or for fastening a cover. The areas 1 , 3 and 4 can in principle have any contours that can be produced in the injection molding process.
Abgesehen von den genannten Stukturelementen kann der Vorformling als Platte oder als vorgeformter Becher mit relativ dicken Seitenwänden 2 ausgebildet werden. Der Vorformling wird dann umgesetzt und anschließend durch einen Werkzeugkern verformt und dann vorzugsweise mit Druckluft in die endgültige Form gepreßt, wobei im wesentlichen nur die Wände 2 des Bechers gestreckt werden. Apart from the structural elements mentioned, the preform can be designed as a plate or as a preformed cup with relatively thick side walls 2 . The preform is then transferred and then deformed by a tool core and then preferably pressed into the final shape with compressed air, essentially only the walls 2 of the cup being stretched.
Dieser Vorgang ist insbesondere in den Fig. 2 bis 5 dargestellt. Fig. 2 zeigt einen Vorformling 5, der aus zwei übereinandergeschichteten Komponenten 10, 11 hergestellt wurde. Dieser Vorformling wird mit seinem Rand in ein Formwerkzeug 6, 7 eingelegt und anschließend durch einen Werkzeugkern 8 zu einem Becher verformt, wobei zusätzlich Druckluft 14 in das Werkzeug eingebracht wird, um das zu verformende Material an die Innenseite der Formkavität 9 anzupressen. This process is shown in particular in FIGS. 2 to 5. FIG. 2 shows a preform 5 which was produced from two components 10 , 11 which are stacked on top of one another. The edge of this preform is placed in a molding tool 6 , 7 and then deformed by a tool core 8 into a cup, with additional compressed air 14 being introduced into the tool in order to press the material to be molded onto the inside of the molding cavity 9 .
Die Fig. 4 und 5 entsprechen im wesentlichen den Fig. 2 und 3, wobei der dort dargestellte Vorformling 15 jedoch in einem Sandwich-Verfahren hergestellt ist, und einen Kern aus einer ersten Komponente 12 und einer Außenhaut aus einer zweiten Komponente 13 aufweist. FIGS. 4 and 5 substantially correspond to Figs. 2 and 3, wherein the preform shown therein, however, is 15 prepared in a sandwich method, and comprises a core of a first component 12 and an outer skin of a second component 13.
Mit dem erfindungsgemäßen Verfahren ist es möglich, Kunststoffhohlkörper mit komplexen Geometrien im Rand- und Fußbereich herzustellen und dennoch relativ dünne Wandstärken von 0,2 mm im Bereich der Seitenwände zu erzielen. With the method according to the invention it is possible to Plastic hollow body with complex geometries in the edge and Manufacture foot area and still relatively thin wall thicknesses 0.2 mm in the area of the side walls.
Claims (4)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2001152393 DE10152393A1 (en) | 2001-10-24 | 2001-10-24 | Thermoformed plastic container production from injection molded preforms involves stretch forming of wall areas and retention of other features at their original shape and size |
TW91124134A TW561094B (en) | 2001-10-24 | 2002-10-18 | Method for manufacturing plastic hollow body |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2001152393 DE10152393A1 (en) | 2001-10-24 | 2001-10-24 | Thermoformed plastic container production from injection molded preforms involves stretch forming of wall areas and retention of other features at their original shape and size |
Publications (1)
Publication Number | Publication Date |
---|---|
DE10152393A1 true DE10152393A1 (en) | 2003-05-15 |
Family
ID=7703520
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE2001152393 Withdrawn DE10152393A1 (en) | 2001-10-24 | 2001-10-24 | Thermoformed plastic container production from injection molded preforms involves stretch forming of wall areas and retention of other features at their original shape and size |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE10152393A1 (en) |
TW (1) | TW561094B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2869562A1 (en) * | 2004-04-29 | 2005-11-04 | Millet Marius Soc Par Actions | METHOD FOR MANUFACTURING A TOKEN FOR OBTAINING A BOTTLE BY THERMOFORMING AND BLOWING AND THUS OBTAINED THEREBY |
DE102005061689A1 (en) * | 2005-12-21 | 2007-07-05 | Peguform Gmbh | Process for forming molded parts |
DE102006029509A1 (en) * | 2006-06-27 | 2008-01-10 | Volkswagen Ag | Process to apply a plastic foil fleece sleeve to a plastic preform core by combination of heat shrink and form tools |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1704405A1 (en) * | 1967-10-05 | 1971-07-08 | Wmf Wuerttemberg Metallwaren | Process for deforming plates or the like., Made of thermoplastic material and device for carrying out the process |
JPH05228925A (en) * | 1991-11-11 | 1993-09-07 | Toppan Printing Co Ltd | Preform for multilayer thin-walled container |
DE4419162A1 (en) * | 1994-06-01 | 1995-12-07 | Polarcup Gmbh | Container, partic. beaker, made of multi=layer plastic material |
-
2001
- 2001-10-24 DE DE2001152393 patent/DE10152393A1/en not_active Withdrawn
-
2002
- 2002-10-18 TW TW91124134A patent/TW561094B/en active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1704405A1 (en) * | 1967-10-05 | 1971-07-08 | Wmf Wuerttemberg Metallwaren | Process for deforming plates or the like., Made of thermoplastic material and device for carrying out the process |
JPH05228925A (en) * | 1991-11-11 | 1993-09-07 | Toppan Printing Co Ltd | Preform for multilayer thin-walled container |
DE4419162A1 (en) * | 1994-06-01 | 1995-12-07 | Polarcup Gmbh | Container, partic. beaker, made of multi=layer plastic material |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2869562A1 (en) * | 2004-04-29 | 2005-11-04 | Millet Marius Soc Par Actions | METHOD FOR MANUFACTURING A TOKEN FOR OBTAINING A BOTTLE BY THERMOFORMING AND BLOWING AND THUS OBTAINED THEREBY |
WO2005115725A1 (en) * | 2004-04-29 | 2005-12-08 | Erca Formseal | Method for producing a disc-like blank for obtaining a bottle by thermoforming and blow-moulding and the thus obtained disc-like blank |
DE102005061689A1 (en) * | 2005-12-21 | 2007-07-05 | Peguform Gmbh | Process for forming molded parts |
DE102006029509A1 (en) * | 2006-06-27 | 2008-01-10 | Volkswagen Ag | Process to apply a plastic foil fleece sleeve to a plastic preform core by combination of heat shrink and form tools |
Also Published As
Publication number | Publication date |
---|---|
TW561094B (en) | 2003-11-11 |
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Legal Events
Date | Code | Title | Description |
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OP8 | Request for examination as to paragraph 44 patent law | ||
8130 | Withdrawal |