DE102013019432B4 - Thermoforming tool for heating a pre-stretch die for thermoforming plastic films - Google Patents
Thermoforming tool for heating a pre-stretch die for thermoforming plastic films Download PDFInfo
- Publication number
- DE102013019432B4 DE102013019432B4 DE102013019432.6A DE102013019432A DE102013019432B4 DE 102013019432 B4 DE102013019432 B4 DE 102013019432B4 DE 102013019432 A DE102013019432 A DE 102013019432A DE 102013019432 B4 DE102013019432 B4 DE 102013019432B4
- Authority
- DE
- Germany
- Prior art keywords
- thermoforming
- tool
- heating
- ferrite core
- stretch
- 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.)
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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
- 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
- B29C51/18—Thermoforming apparatus
- B29C51/20—Thermoforming apparatus having movable moulds or mould parts
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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
- B29C51/08—Deep drawing or matched-mould forming, i.e. using mechanical means only
- B29C51/082—Deep drawing or matched-mould forming, i.e. using mechanical means only by shaping between complementary mould parts
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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
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/30—Moulds
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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
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/42—Heating or cooling
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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
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/42—Heating or cooling
- B29C51/428—Heating or cooling of moulds or mould parts
-
- 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
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/46—Measuring, controlling or regulating
Abstract
Thermoformwerkzeug mit einer Vorrichtung zum Erwärmen eines Vorstreckstempels (6) für das Thermoformen von erwärmten Kunststofffolien (1) in einer Thermoformmaschine (9) umfassend ein Oberwerkzeug (4) und ein Unterwerkzeug (5), dadurch gekennzeichnet, dass das Oberwerkzeug (4) mindestens einen Induktor (8) und mindestens einen Vorstreckstempel (6), in den ein vollständig vom Material des Vorstreckstempels umgebener Ferritkern (7) eingebaut ist, aufweist zur induktiven Erwärmung des Vorstreckstempels (6).Thermoforming tool comprising a device for heating a pre-stretching punch (6) for thermoforming heated plastic films (1) in a thermoforming machine (9) comprising an upper tool (4) and a lower tool (5), characterized in that the upper tool (4) at least one Inductor (8) and at least one Vorstreckstempel (6), in which a completely surrounded by the material of Vorstreckstempels ferrite core (7) is installed, for inductive heating of the pre-stretching die (6).
Description
Die Erfindung betrifft ein Thermoformwerkzeug zum Erwärmen eines Vorstreckstempels für das Thermoformen von Kunststofffolien.The invention relates to a thermoforming tool for heating a Vorstreckstempels for thermoforming of plastic films.
Stand der TechnikState of the art
Aus dem Stand der Technik ist es bekannt, Vorstreckstempel durch den Einsatz von Heizpatronen zu erwärmen. Nachteilig daran ist, dass empfindliche Bauelemente wie die Heizpatronen und elektrische Zuführungen dauernden Bewegungen und Erschütterungen ausgesetzt sind. Dies hat dazu geführt, dass diese Systeme sich am Markt nicht durchgesetzt haben.From the prior art it is known to heat pre-stretch stamp by the use of heating cartridges. The disadvantage of this is that sensitive components such as the heating cartridges and electrical feeds are exposed to constant movements and shocks. This has meant that these systems have not prevailed on the market.
Andererseits besteht der Wunsch, den Vorstreckstempel, besonders bei Produktionsbeginn so aufzuheizen, dass er bei Produktionsbeginn die Temperatur aufweist, die sich als Beharrungstemperatur nach einer längeren Produktionszeit einstellt. Zum anderen ergeben sich Möglichkeiten, über die Temperatur des Vorstreckstempels die Rheologie der Verstreckung, d. h. die Reibverhältnisse zwischen Vorstreckstempel und Kunststofffolie gezielt zu beeinflussen.On the other hand, there is a desire to heat the pre-stretch die, especially at the start of production so that it has the temperature at the beginning of production, which sets as a steady-state after a longer production time. On the other hand, there are possibilities over the temperature of the pre-stretching die the rheology of the stretching, d. H. to selectively influence the friction conditions between the pre-stretch punch and the plastic foil.
Aus
Aus
Aufgabenstellungtask
Der Erfindung liegt die Aufgabe zugrunde, ein Thermoformwerkzeug und ein Verfahren zum Erwärmen eines Vorstreckstempels so zu gestalten, dass die Vorrichtung keine empfindlichen Bauelemente aufweist.The invention has for its object to make a thermoforming mold and a method for heating a pre-stretching die so that the device has no sensitive components.
Gelöst ist diese Aufgabe erfindungsgemäß durch die im Kennzeichen des Anspruches 1 angegebenen Maßnahmen. Weitere bevorzugte Ausgestaltungen der Erfindung ergeben sich aus übrigen, in den jeweiligen Unteransprüchen genannten Merkmalen.This object is achieved according to the invention by the measures indicated in the characterizing part of claim 1. Further preferred embodiments of the invention will become apparent from the remaining features mentioned in the respective subclaims.
Ausführungsbeispielembodiment
Vorgeschlagen wird ein Thermoformwerkzeug mit einer Vorrichtung zum Erwärmen eines Vorstreckstempels für das Thermoformen von Kunststofffolien in einer Thermoformmaschine mit einem Oberwerkzeug und einem Unterwerkzeug, wobei das Oberwerkzeug mindestens einen Induktor und mindestens einen Vorstreckstempel mit einem Ferritkern aufweist zur induktiven Erwärmung des Vorstreckstempels.The proposal is for a thermoforming tool having a device for heating a pre-stretch die for thermoforming plastic films in a thermoforming machine with an upper tool and a lower tool, wherein the upper tool has at least one inductor and at least one pre-stretch punch with a ferrite core for inductive heating of the pre-stretch punch.
Der Vorteil des Thermoformwerkzeugs liegt darin, dass im bewegten Vorstreckstempel nur ein Ferritkern eingebaut ist, der im einfachsten Fall als kostengünstige Scheibe aus ferritischem Stahl ausgebildet ist. Beim Absenken des Vorstreckers entfernt sich der Ferritkern aus dem Wirkungsbereich des Induktors, der über dem Vorstrecker angebracht ist, wenn sich dieser in seiner obersten Position befindet. In der obersten Position befindet sich der Ferritkern im Wirkungsbereich des Induktors und im Ferritkern werden Wirbelströme induziert, die zur raschen Erwärmung des Ferritkerns führen. Der Ferritkern überträgt diese Energie im Kontaktverfahren an den Vorstreckstempel. Der Ferritkern benötigt keinerlei elektrische Leitungen oder elektrischen Bauelemente, sondern wird passiv erwärmt durch die Wirbelströme, die der Induktor in seinem Nahbereich in Bauteilen mit ferritischen Stählen induziert.The advantage of the thermoforming tool is that only one ferrite core is installed in the moving pre-stretching die, which in the simplest case is designed as a cost-effective disk made of ferritic steel. When lowering the pre-stretchers, the ferrite core is removed from the area of action of the inductor, which is mounted over the pre-stretchers, when this is in its uppermost position. In the uppermost position, the ferrite core is located in the area of action of the inductor, and eddy currents are induced in the ferrite core, leading to rapid heating of the ferrite core. The ferrite core transfers this energy in the contact process to the Vorstreckstempel. The ferrite core does not require any electrical leads or electrical components but is passively heated by the eddy currents induced by the inductor in its vicinity in ferritic steels.
Der Induktor ist ortsfest, beispielsweise am Oberwerkzeug angebracht. Der Induktor selbst ist ein robustes und einfaches Bauteil und besteht beispielsweise aus einer schneckenförmig gewickelten Kupferlitze, die so ausgelegt ist, dass sie die Hochfrequenzwechselspannung, die die Ansteuerung der Kupferlitze aufprägt, ertragen kann. Die Ansteuerung kann beispielsweise schwingungsentkoppelt außerhalb oder innerhalb des Thermoformwerkzeugs aufgebaut sein.The inductor is stationary, for example, attached to the upper tool. The inductor itself is a robust and simple component and consists for example of a helically wound copper strand, which is designed so that it can withstand the high-frequency AC voltage, which imprints the control of the copper strand. The control can be constructed, for example, vibration-decoupled outside or inside the thermoforming mold.
Weitere Einzelheiten der Erfindung sind nachfolgend anhand der schematischen Zeichnungen näher beschrieben. Es zeigen:Further details of the invention are described below with reference to the schematic drawings. Show it:
Es wird im Rahmen der Erfindung vorgeschlagen, ein Thermoformwerkzeug mit einer Vorrichtung zum Erwärmen eines Vorstreckstempels
Weiterhin ist es erfinderisch vorgesehen, dass der Induktor
Ebenfalls ist es vorteilhaft, wenn der Induktor
Eine vorteilhafte Ausprägung stellt ein Ferritkern
Es ist ebenfalls vorteilhaft, wenn der Ferritkern
Weiter ist es vorteilhaft, wenn im oder am Vorstreckstempel
Es wird außerdem vorgeschlagen, dass der Temperatursensor
BezugszeichenlisteLIST OF REFERENCE NUMBERS
- 11
- KunststofffoliePlastic film
- 22
- Heizungheater
- 33
- Formstationforming station
- 44
- Oberwerkzeugupper tool
- 55
- Unterwerkzeuglower tool
- 66
- VorstreckstempelPlug assist
- 77
- Ferritkernferrite
- 88th
- Induktorinductor
- 99
- ThermoformmaschineThermoforming machine
- 1010
- Temperatursensortemperature sensor
- 1111
- NiederhalterStripper plate
- 1212
- Verlängerungrenewal
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102013019432.6A DE102013019432B4 (en) | 2013-11-20 | 2013-11-20 | Thermoforming tool for heating a pre-stretch die for thermoforming plastic films |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102013019432.6A DE102013019432B4 (en) | 2013-11-20 | 2013-11-20 | Thermoforming tool for heating a pre-stretch die for thermoforming plastic films |
Publications (2)
Publication Number | Publication Date |
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DE102013019432A1 DE102013019432A1 (en) | 2015-05-21 |
DE102013019432B4 true DE102013019432B4 (en) | 2016-12-08 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE102013019432.6A Active DE102013019432B4 (en) | 2013-11-20 | 2013-11-20 | Thermoforming tool for heating a pre-stretch die for thermoforming plastic films |
Country Status (1)
Country | Link |
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DE (1) | DE102013019432B4 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1352462A (en) * | 1972-02-12 | 1974-05-08 | Butlers Ltd | Method and apparatus for re-forming plastics |
EP2258536B1 (en) * | 2009-06-05 | 2011-09-21 | Uhlmann Pac-Systeme GmbH & Co. KG | Device for thermoforming a film |
-
2013
- 2013-11-20 DE DE102013019432.6A patent/DE102013019432B4/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1352462A (en) * | 1972-02-12 | 1974-05-08 | Butlers Ltd | Method and apparatus for re-forming plastics |
EP2258536B1 (en) * | 2009-06-05 | 2011-09-21 | Uhlmann Pac-Systeme GmbH & Co. KG | Device for thermoforming a film |
Also Published As
Publication number | Publication date |
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DE102013019432A1 (en) | 2015-05-21 |
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