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DE4023887A1 - Thermo-forming equipment for plastic film - uses radiation heater to heat up mould tool which is blackened or suitably coated to absorb radiation uniformly - Google Patents

Thermo-forming equipment for plastic film - uses radiation heater to heat up mould tool which is blackened or suitably coated to absorb radiation uniformly

Info

Publication number
DE4023887A1
DE4023887A1 DE19904023887 DE4023887A DE4023887A1 DE 4023887 A1 DE4023887 A1 DE 4023887A1 DE 19904023887 DE19904023887 DE 19904023887 DE 4023887 A DE4023887 A DE 4023887A DE 4023887 A1 DE4023887 A1 DE 4023887A1
Authority
DE
Germany
Prior art keywords
tool
radiation
mold
heat
heating
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Withdrawn
Application number
DE19904023887
Other languages
German (de)
Inventor
Emil Hoelzl
Bernhard Wagner
Alfred Dick
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Priority to DE19904023887 priority Critical patent/DE4023887A1/en
Publication of DE4023887A1 publication Critical patent/DE4023887A1/en
Withdrawn legal-status Critical Current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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/02—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means
    • 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
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/34—Component parts, details or accessories; Auxiliary operations
    • B29C41/38—Moulds, cores or other substrates
    • 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
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/34—Component parts, details or accessories; Auxiliary operations
    • B29C41/46—Heating or cooling
    • 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
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
    • B29C41/04—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

Equipment for thermoforming plastic films has a mould tool which is radiation heated at one station, covered with the fusible film in another station, and sepd. from the cooled moulding in a third station. The moulding face of the tool has a surface coating which absorbs the radiation heat applied. To avoid the variable heating produced by reflecting surfaces of the mould tool, the tool is e.g. blackened, or, pref., given a coating which is esp. suitable for the frequency range of the radiation heat. The heating oven used, however, requires to have a high reflectivity for effective heating, and, in addn., the tool should be rotated in the oven. Such rotation is partic. desirable when the mould tool has e.g. undercuts. Alternatively the radiant heater itself can be rotated about the tool to produce uniform heating. These actions have the effect of optimal utilisation of the energy provided. ADVANTAGE - The system heats the film efficiently (unlike earlier but similar equipment).

Description

Die Erfindung betrifft eine Vorrichtung zum Herstellen von Kunststoff-Formfolien mit einem Formwerkzeug, das in einer Heizstation durch Strahlung erwärmt, in einer Be­ schickungsstation mit auf der Formoberfläche des Form­ werkzeugs aufschmelzbarem Kunststoff beschichtet und in einer Entformstation von der auf der Formoberfläche des abgekühlten Formwerkzeuges gebildeten Kunststoff-Formfo­ lie getrennt wird. Eine derartige Vorrichtung ist aus der europäischen Patentanmeldung 03 34 074 oder 03 34 073 be­ kannt.The invention relates to a device for manufacturing of plastic molded films with a molding tool that is in a heating station heated by radiation, in a loading loading station with on the mold surface of the mold tool meltable plastic coated and in a demolding station from that on the mold surface of the cooled mold formed plastic mold lie is separated. Such a device is from the European patent application 03 34 074 or 03 34 073 be knows.

In der Erkenntnis, daß bei der bekannten Vorrichtung die in den jeweiligen Heizstationen bzw. Heizeinrichtungen zugeführte Energie nicht in optimaler Weise genutzt wird, hat sich die Erfindung die Aufgabe gestellt, hier Abhilfe zu schaffen.Recognizing that in the known device in the respective heating stations or heating devices supplied energy is not used in an optimal way, the invention has set itself the task, remedy here to accomplish.

Zur Lösung dieser Aufgabe sind die kennzeichnenden Merk­ male des Anspruchs 1 vorgesehen. Vorteilhafte Weiterbil­ dungen der Erfindung beschreiben die Unteransprüche.To solve this problem, the characteristic notes are male of claim 1 provided. Advantageous training The invention describes the subclaims.

Beim Formwerkzeug handelt es sich üblicherweise um eine galvanisch erzeugte Metallstruktur, die somit auch eine metallische Oberfläche aufweist. Da metallische, hell glänzende Oberflächen jedoch ein hohes Reflektionsvermö­ gen besitzen, wird die durch Strahlung zugeführte Wärme­ menge nur teilweise vom Formwerkzeug aufgenommen. Hier schafft die Erfindung Abhilfe, indem die Formoberfläche des Formwerkzeuges mit einer die Wärmestrahlung absorbie­ renden Beschichtung versehen ist. Dies kann durch einfa­ che Schwärzung (beispielsweise Brünieren) erfolgen, es ist jedoch auch möglich, eine vorzugsweise speziell auf das Frequenzband des eingesetzten Wärmestrahlers abge­ stimmte absorbierende Beschichtung aufzubringen.The mold is usually one galvanically generated metal structure, which is also a  has a metallic surface. Because metallic, bright shiny surfaces, however, have a high reflectivity have the heat supplied by radiation quantity only partially absorbed by the mold. Here the invention remedies the mold surface of the mold with an absorption of heat radiation coating is provided. This can be done by simple blackening (e.g. blackening) However, it is also possible to use one, preferably specifically abge the frequency band of the heat radiator used agreed to apply absorbent coating.

Hingegen ist eine ausgeprägte Wärmestrahlungsreflexion an den Innenwänden des das Formwerkzeug aufnehmenden Strah­ lungsofens erwünscht, um tatsächlich die gesamte zuge­ führte Strahlungsenergie dem Formwerkzeug zuführen zu können. Eine die Wärmestrahlung reflektierende Beschich­ tung der Innenwände des Strahlungsofens ist daher Inhalt des zweiten Patentanspruchs. Um darüber hinaus die ge­ samte Oberfläche des Formwerkzeuges inklusive eventueller Hinterschnitte optimal der Wärmestrahlung auszusetzen, ist es empfehlenswert, das Formwerkzeug bezüglich der die Wärmestrahlung abgebenden Ofenflächen insbesondere dreh­ bar anzuordnen, so daß durch Verdrehen des Formwerkzeuges jegliche Bildung von Strahlungsschatten oder un­ gleichmäßiger Strahlungsverteilung vermieden wird. Selbstverständlich ist es auch möglich, den Wärmestrahler bezüglich des Formwerkzeuges zu bewegen bzw. zu verdre­ hen.On the other hand, there is a pronounced heat radiation reflection the inner walls of the beam receiving the molding tool oven is actually required to actually move the entire led radiant energy to the mold can. A coating reflecting the heat radiation The interior walls of the radiation furnace are therefore content of the second claim. In addition, the ge entire surface of the mold including any Optimally exposing undercuts to heat radiation, it is recommended to use the mold with respect to the Oven surfaces emitting heat radiation in particular rotate Arrange bar so that by turning the mold any formation of radiation shadows or un uniform radiation distribution is avoided. Of course it is also possible to use the radiant heater to move or twist with respect to the mold hen.

Durch diese Maßnahmen wird das während des Fertigungspro­ zesses von Kunststoff-Formfolien benötigte Energiepoten­ tial in optimaler Weise ausgenutzt.Through these measures, this will be during the manufacturing pro Processes of energy required by plastic foils exploited in an optimal way.

Claims (3)

1. Vorrichtung zum Herstellen von Kunststoff-Formfolien mit einem Formwerkzeug, das in einer Heizstation durch Strahlung erwärmt, in einer Beschickungssta­ tion mit auf der Formoberfläche des Formwerkzeugs aufschmelzbarem Kunststoff beschichtet und in einer Entformstation von der auf der Formoberfläche des abgekühlten Formwerkzeugs gebildeten Kunststoff- Formfolie getrennt wird, dadurch gekennzeichnet, daß die Formoberfläche des Formwerkzeuges mit einer die Wärmestrahlung absor­ bierenden Beschichtung versehen ist.1. Device for producing plastic films with a mold that is heated in a heating station by radiation, coated in a charging station with meltable plastic on the mold surface of the mold and coated in a demolding station from the plastic mold formed on the mold surface of the cooled mold is separated, characterized in that the mold surface of the molding tool is provided with a heat-absorbing coating. 2. Vorrichtung nach Anspruch 1 mit einem Strahlungsofen zur Erwärmung des Formwerkzeuges, dadurch gekennzeichnet, daß die Innenwände des Strahlungsofens mit einer die Wärmestrahlung reflek­ tierenden Beschichtung versehen sind.2. Device according to claim 1 with a radiation oven for heating the mold, characterized in that the inner walls of the Radiation furnace with a heat radiation reflect coating are provided. 3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Formwerkzeug während der Strahlungserwärmung relativ zu der/den die Wär­ mestrahlung abgebenden Fläche(n) bewegbar/verdrehbar ist.3. Device according to claim 1 or 2, characterized in that the molding tool during the radiant heating relative to the heat Surface (s) emitting radiation can be moved / rotated is.
DE19904023887 1990-07-27 1990-07-27 Thermo-forming equipment for plastic film - uses radiation heater to heat up mould tool which is blackened or suitably coated to absorb radiation uniformly Withdrawn DE4023887A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19904023887 DE4023887A1 (en) 1990-07-27 1990-07-27 Thermo-forming equipment for plastic film - uses radiation heater to heat up mould tool which is blackened or suitably coated to absorb radiation uniformly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19904023887 DE4023887A1 (en) 1990-07-27 1990-07-27 Thermo-forming equipment for plastic film - uses radiation heater to heat up mould tool which is blackened or suitably coated to absorb radiation uniformly

Publications (1)

Publication Number Publication Date
DE4023887A1 true DE4023887A1 (en) 1992-01-30

Family

ID=6411135

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19904023887 Withdrawn DE4023887A1 (en) 1990-07-27 1990-07-27 Thermo-forming equipment for plastic film - uses radiation heater to heat up mould tool which is blackened or suitably coated to absorb radiation uniformly

Country Status (1)

Country Link
DE (1) DE4023887A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0551830A1 (en) * 1992-01-13 1993-07-21 Husky Injection Molding Systems Ltd. Flexible heating element for a hot runner housing including method of manufacture and method of installation
WO1998001277A1 (en) * 1996-07-05 1998-01-15 Lupke Manfred Arno Alfred Molding apparatus with non-reflective mold tunnels
EP0985521A1 (en) * 1998-08-24 2000-03-15 Omni-Pac GmbH Arrangement for heating the surface of an object, in particular of a pressed or moulded article

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
63-227307 A., M-784, Jan. 13, 1989, Vol.13,No. 14 *
JP Patents Abstracts of Japan: 63- 41108 A., M-719, July 20, 1988, Vol.12,No.257 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0551830A1 (en) * 1992-01-13 1993-07-21 Husky Injection Molding Systems Ltd. Flexible heating element for a hot runner housing including method of manufacture and method of installation
WO1998001277A1 (en) * 1996-07-05 1998-01-15 Lupke Manfred Arno Alfred Molding apparatus with non-reflective mold tunnels
US5824351A (en) * 1996-07-05 1998-10-20 Lupke; Manfred A. A. Molding apparatus with non-reflective mold tunnels
EP0985521A1 (en) * 1998-08-24 2000-03-15 Omni-Pac GmbH Arrangement for heating the surface of an object, in particular of a pressed or moulded article

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Legal Events

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OM8 Search report available as to paragraph 43 lit. 1 sentence 1 patent law
8139 Disposal/non-payment of the annual fee