DE19640130A1 - Production of injected-gas foamed mouldings with bonded surface skin in all desired locations - Google Patents
Production of injected-gas foamed mouldings with bonded surface skin in all desired locationsInfo
- Publication number
- DE19640130A1 DE19640130A1 DE1996140130 DE19640130A DE19640130A1 DE 19640130 A1 DE19640130 A1 DE 19640130A1 DE 1996140130 DE1996140130 DE 1996140130 DE 19640130 A DE19640130 A DE 19640130A DE 19640130 A1 DE19640130 A1 DE 19640130A1
- Authority
- DE
- Germany
- Prior art keywords
- skin
- mold
- gas
- plastic material
- expandable
- 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- Withdrawn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
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/3442—Mixing, kneading or conveying the foamable material
- B29C44/3446—Feeding the blowing agent
- B29C44/3453—Feeding the blowing agent to solid plastic material
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
- B29C44/14—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements the preformed part being a lining
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/3442—Mixing, kneading or conveying the foamable material
- B29C44/3446—Feeding the blowing agent
Landscapes
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Herstellen von geschäumten Formkörpern, bei dem schäumbares und expandierbares Kunststoffma terial in eine Form gefüllt und zum Schäumen und Expandieren Treib gas in die Form eingeblasen wird.The invention relates to a method for producing foamed Shaped bodies with the foamable and expandable plastic material filled into a mold and foaming and expanding gas is blown into the mold.
Ein derartiges Verfahren ist bekannt, bei dem ein Abschnitt der Form mit einem Heizelement geheizt wird, um an diesem Abschnitt den Formkörper zu verhauten, d. h. eine Haut anzuschmelzen, welche die Oberfläche des Formkörpers homogen schließt. Um jedoch das Treibgas in den Formkörper einblasen zu können, muß sichergestellt sein, daß in den Bereichen, in denen das Treibgas eingeblasen wird, sich keine Haut ausbildet, da das Treibgas nicht durch eine Haut hindurch eingeblasen werden kann. Dies hat zur Folge, daß mit die sem bekannten Verfahren nur Formkörper herstellbar sind, die in mindestens einem Bereich eine Haut, und in mindestens einem anderen Bereich keine Haut aufweisen.Such a method is known in which a section of the Form with a heating element is heated to this section to knock the molded body, d. H. to melt a skin, which the surface of the molded body closes homogeneously. But to do that Blowing propellant gas into the molded body must be ensured be that in the areas where the propellant gas is injected, no skin forms because the propellant does not pass through a skin can be blown through. This has the consequence that with the Sem known process can only produce moldings that are in skin in at least one area, and in at least one other area Area without skin.
Aufgabe der Erfindung ist es demgegenüber, ein Verfahren der ein gangs genannten Art derart weiterzubilden, daß geschäumte Formkör per an jedem gewünschten Oberflächenabschnitt in der Form mit einer Haut versehen werden können.In contrast, the object of the invention is a method of gangs mentioned type in such a way that foamed molding per on any desired surface section in the form with a Skin can be provided.
Diese Aufgabe wird bei dem Verfahren der eingangs genannten Art erfindungsgemäß dadurch gelöst, daß mindestens ein Abschnitt der Forminnenfläche mit einer gasdurchlässigen Haut belegt wird, die sich bei der Herstellung des Formkörpers mit diesem verbindet.This task is performed in the process of the type mentioned at the beginning solved according to the invention in that at least a portion of the The inner surface of the mold is covered with a gas-permeable skin that connects to the molded body during manufacture.
Die Vorteile der Erfindung liegen insbesondere darin, daß vorgege bene Abschnitte der Forminnenfläche mit einer gasdurchlässigen Haut, beispielsweise einer perforierten Kunststoffolie, belegt werden, die sich bei der Herstellung des Formkörpers mit dem Form körper verbindet und - durch ausreichende Mikroperforierung - das Einblasen des Treibgases in das zu expandierende Kunststoffmaterial ermöglicht. Insbesondere läßt sich mit diesem Verfahren ein ge schäumter Formkörper herstellen, der in einem Bereich der Ober fläche in der bekannten Weise, d. h. durch Erhitzen der Oberfläche, verhautet wird, und der in einem anderen Bereich der Oberfläche eine gasdurchlässige Haut aus Folienmaterial aufweist. Mit diesem Verfahren ist es daher insbesondere möglich, geschäumte Formkör per herzustellen, deren gesamte Oberfläche mit einer Haut ver sehen ist, wobei Abschnitte der Oberfläche eine thermische Ver hautung des Formkörper-Materials, und andere Abschnitte eine gasdurchlässige "Fremd"-Haut aufweisen, die sich bei der Herstel lung des Formkörpers mit dem Formkörper verbindet. Gemäß einer besonders bevorzugten Ausführungsform der Erfindung läßt sich als gasdurchlässige Haut eine Folie aus Kunststoffmaterial vor sehen, welche ausreichend perforiert ist. Die in die Form ein gelegte Haut kann alternativ auch aus einer textilen oder faserhal tigen Schicht bestehen, und diejenigen Abschnitte der Form, welche mit der Folienhaut belegt sind, werden bevorzugt auf eine vorgege bene Temperatur erhitzt, welche sicherstellt, daß diese in die Form eingelegte Haut sich mit dem Formkörper verbindet.The advantages of the invention lie in particular in that Flat sections of the mold inner surface with a gas-permeable Skin, for example a perforated plastic film be in the manufacture of the molded body with the mold body connects and - through sufficient microperforation - that Blowing the propellant gas into the plastic material to be expanded enables. In particular, a ge produce foamed molded body in an area of the upper area in the known manner, d. H. by heating the surface, is struck, and in another area of the surface has a gas-permeable skin made of film material. With this In particular, it is therefore possible to use foamed molded articles per manufacture, the entire surface of which ver see is, where portions of the surface a thermal Ver skin of the molding material, and other sections have gas permeable "foreign" skin, which is in the manufacture tion of the molded body connects to the molded body. According to one particularly preferred embodiment of the invention can be a film made of plastic material as a gas-permeable skin see which is sufficiently perforated. The one in the form laid skin can alternatively also be made from a textile or fiber layer, and those sections of the mold which are covered with the film skin, are preferred to a heated temperature, which ensures that this in the Molded skin connects to the molded body.
Als Material zur Herstellung des Formkörpers eignet sich beispiels weise expandierbares Polyäthylen, expandierbares Polypropylen oder expandierbares Polyamid.A suitable material for producing the shaped body is, for example as expandable polyethylene, expandable polypropylene or expandable polyamide.
Die Mikroperforierung der Folienhaut wird bevorzugt so dimensio niert, daß die Perforation nicht sichtbar ist.The microperforation of the film skin is preferably so dimensionally niert that the perforation is not visible.
Vorteilhafte Weiterbildungen der Erfindung sind durch die Merk male der Unteransprüche gekennzeichnet.Advantageous further developments of the invention can be found in the note marked male of the subclaims.
Fig. 1 zeigt einen Querschnitt durch eine Form 2, die aus zwei Formhälften 4, 6 besteht. Die Forminnenfläche 8 der unteren Form hälfte 6 ist mit einer Folie 10 aus Kunststoffmaterial belegt, die eine Mikroperforierung aufweist. Durch die untere Formhälfte 6 wird - durch die Folie hindurch - das Treibgas in das expan dierbare und schäumbare Kunststoffmaterial eingeblasen, welches dadurch zu einem Schaumstoff expandiert, der den Formhohlraum 7 ausfüllt und sich mit der Folienhaut 10 verbindet. Der Form innenfläche der oberen Formhälfte 4 benachbart sind Heizelemente 12 in die Formhälfte eingelassen. Auf diese Weise wird die Form innenfläche der oberen Formhälfte 4 so beheizt, daß sich der in der Form bildende Schaumstoff mit einer integralen Haut verhautet. Fig. 1 shows a cross section through a mold 2 , which consists of two mold halves 4 , 6 . The inner mold surface 8 of the lower mold half 6 is covered with a film 10 made of plastic material which has a microperforation. Through the lower mold half 6 - through the film - the propellant gas is blown into the expandable and foamable plastic material, which thereby expands to a foam that fills the mold cavity 7 and connects to the film skin 10 . The mold inner surface of the upper mold half 4 adjacent heating elements 12 are embedded in the mold half. In this way, the mold inner surface of the upper mold half 4 is heated so that the foam forming in the mold is pelted with an integral skin.
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1996140130 DE19640130A1 (en) | 1996-09-28 | 1996-09-28 | Production of injected-gas foamed mouldings with bonded surface skin in all desired locations |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1996140130 DE19640130A1 (en) | 1996-09-28 | 1996-09-28 | Production of injected-gas foamed mouldings with bonded surface skin in all desired locations |
Publications (1)
Publication Number | Publication Date |
---|---|
DE19640130A1 true DE19640130A1 (en) | 1998-04-02 |
Family
ID=7807317
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1996140130 Withdrawn DE19640130A1 (en) | 1996-09-28 | 1996-09-28 | Production of injected-gas foamed mouldings with bonded surface skin in all desired locations |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE19640130A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2942181A1 (en) | 2014-05-06 | 2015-11-11 | AHa! Thermoforming GmbH | Method for coating foam articles with a plastic film, and the manufactured article |
WO2019101703A1 (en) | 2017-11-27 | 2019-05-31 | Evonik Röhm Gmbh | High-temperature foams with reduced resin absorption for producing sandwich materials |
-
1996
- 1996-09-28 DE DE1996140130 patent/DE19640130A1/en not_active Withdrawn
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2942181A1 (en) | 2014-05-06 | 2015-11-11 | AHa! Thermoforming GmbH | Method for coating foam articles with a plastic film, and the manufactured article |
DE102014106265A1 (en) | 2014-05-06 | 2015-11-12 | Aha! Thermoforming Gmbh | Method for scarfing foam parts with a plastic film |
WO2019101703A1 (en) | 2017-11-27 | 2019-05-31 | Evonik Röhm Gmbh | High-temperature foams with reduced resin absorption for producing sandwich materials |
US11485832B2 (en) | 2017-11-27 | 2022-11-01 | Evonik Operations Gmbh | High-temperature foams with reduced resin absorption for producing sandwich materials |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8127 | New person/name/address of the applicant |
Owner name: DITTRICH, KLAUS-JUERGEN, 28832 ACHIM, DE |
|
8141 | Disposal/no request for examination |