DE2106633A1 - Long foamed objects - made by inserting solid bar in mould then expanding it - Google Patents
Long foamed objects - made by inserting solid bar in mould then expanding itInfo
- Publication number
- DE2106633A1 DE2106633A1 DE19712106633 DE2106633A DE2106633A1 DE 2106633 A1 DE2106633 A1 DE 2106633A1 DE 19712106633 DE19712106633 DE 19712106633 DE 2106633 A DE2106633 A DE 2106633A DE 2106633 A1 DE2106633 A1 DE 2106633A1
- Authority
- DE
- Germany
- Prior art keywords
- expanding
- mould
- foam
- solid bar
- rod
- 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.)
- Pending
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
- B29C44/36—Feeding the material to be shaped
- B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
-
- 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
- B29K2105/255—Blocks or tablets
Landscapes
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
Description
"Verfahren zum Ausschäumen von länglichen Hohlkörpern" Beschreibung Beim Äusschäunfen geschlossener Hohlprofile besteht nach den bisher angewandten Verfahren die Schwierigkeit darin, den zähflüssigen Schaumansatz innerhalb der kurzen, bis zum Beginn des Aurschäumens zur Verfügung stehenden Zeit in den engen Profilhohlraum einzubringen und möglichst gleichmäßig über seine ganze Länge zu verteilen. Man behilft sich mit Sonden, welche Jedoch nur einen Teil der üblichen Profil-Länge von 6 Meter bestreichen können, oder mit einer Reihe von über die Profillänge verteilten Bohrungen, durch welche der Schaumansatz in einzelnen Portionen eingefüllt wird. Beide Verfahren sind aus technischen und wirtschaftlichen Gründen nicht voll befriedigend."Process for the foaming of elongated hollow bodies" Description When opening closed hollow profiles there is according to the previously used Process the difficulty in removing the viscous foam within the short, available time in the narrow profile cavity until the start of the foaming to be introduced and distributed as evenly as possible over its entire length. Man makes do with probes, which, however, only part of the usual profile length of 6 meters, or with a number of spread over the length of the profile Holes through which the foam is filled in individual portions. Both processes are not completely satisfactory for technical and economic reasons.
Im Gegensatz dazu wird erfindungsgemäß vorgeschlagen, anstelle des flüssigen Schaunansatzes ein festes Schaum-Vorprodukt zu verwenden, beispielsweise PSI-Polsmerisatstäbe als Vorprodukt von PMI-Schaumstoff. Das feste Schaum-Vorprodukt wird in Stabform in den Profilhohlraum eingeführt, wobei der Stab ebenso lang ist wie der Hohlraum, Jedoch von kleinerem Querschnitt. Das Querschnittsverhältnis wird durch die Dichte der gewünschten Schaumfüllung bestimmt. Das Einführen des Schaumvorprodukt-Stabes kann ohne Hilfsmittel bewerkstelligt werden. Die gleichmäßige Material~ verteilung über die Länge des Hohlraumes ist durch den gleichbleibenden Querschnitt des Stabes gewährleistet. Nach Einführen des Stabes tritt der Schäumprozeßßentweder durch Zeitablauf ein oder wird durch geeignete Maßnahmen in Gang gesetzt. Im Falle des PMI-Polymerisatstabes erfolgt dies durch Erhitzen auf 170 - 230 ° C.In contrast, it is proposed according to the invention, instead of the to use a solid foam intermediate product, for example PSI Polsmerisatststabs as a pre-product of PMI foam. The solid foam pre-product is inserted into the profile cavity in the form of a rod, the rod being just as long like the cavity, but with a smaller cross-section. The aspect ratio becomes determined by the density of the desired foam filling. The introduction of the foam pre-product rod can be done without tools. The even distribution of material over the length of the cavity is due to the constant cross-section of the rod guaranteed. After inserting the rod, the foaming process occurs either by the passage of time or is set in motion by suitable measures. In the case of the PMI polymer rod this is done by heating to 170 - 230 ° C.
Der entstehende Schaum paßt sich durch inneren Druck den Konturen des Profilhohlraumes plastisch an und erfüllt ihn vollständig. inschließend erstarrt der Schaum zu der gewünschten Schaumfüllung.The resulting foam adapts to the contours through internal pressure of the profile cavity plastically and completely fills it. subsequently solidified the foam to the desired foam filling.
Das Verfahren wird mit zwei Zeichnungen erläutert Fig. 1 (1) 3 auszuschäumender Hohlkörper ja Querschnitt (2) = stabförmiges Schaus-Yorprodukt im Querschnitt Fig. 2 (1) = ausgeschäumter Hohlkörper in Querschnitt (3) . Schaumfüllung, aus (2) nach Volumenvergrößerung entstanden.The method is explained with two drawings Fig. 1 (1) 3 to be foamed Hollow body yes cross section (2) = rod-shaped spectacle product in cross section Fig. 2 (1) = foamed hollow body in cross section (3). Foam filling, from (2) according to Volume increase emerged.
Mit dem beschriebenen Verf#bren besteht ferner die Möglichkeit, die Schaumdichte in verschiedenen Zonen des Hohlkörpers verschieden hoch einzustellen, indem der Querschnitt des Schaumvorprodukt-Stabes an den betreffenden Stellen größer oder kleiner gehalten wird.With the described procedure there is also the possibility of using the Adjust the foam density in different zones of the hollow body to different levels, by making the cross-section of the foam precursor rod larger at the relevant points or is kept smaller.
Soll andererseits ein Hohlkörper, dessen Querschnitt in verschiedenen Zonen verschieden groß ist, mit gleichmäßiger Dichte ausgeschäumt werden, so kann dies ebenfalls durch entsprechende Querschnittsanpassung des Schaumvorprodukt-Stabes erreicht werden.On the other hand, a hollow body whose cross-section is different Zones of different sizes can be foamed with a uniform density this is also done by adapting the cross-section of the foam pre-product rod accordingly can be achieved.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19712106633 DE2106633A1 (en) | 1971-02-12 | 1971-02-12 | Long foamed objects - made by inserting solid bar in mould then expanding it |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19712106633 DE2106633A1 (en) | 1971-02-12 | 1971-02-12 | Long foamed objects - made by inserting solid bar in mould then expanding it |
Publications (1)
Publication Number | Publication Date |
---|---|
DE2106633A1 true DE2106633A1 (en) | 1972-08-24 |
Family
ID=5798545
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19712106633 Pending DE2106633A1 (en) | 1971-02-12 | 1971-02-12 | Long foamed objects - made by inserting solid bar in mould then expanding it |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE2106633A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012013393A1 (en) * | 2010-07-30 | 2012-02-02 | Evonik Degussa Gmbh | In-mould-foaming process using a foamable medium with outer layers, and plastics moulding obtainable therefrom |
RU2575032C2 (en) * | 2010-07-30 | 2016-02-10 | Эвоник Индустрис Аг | Method of foaming in mould with application of foamable medium and covering layers and resulting plastic moulded product |
-
1971
- 1971-02-12 DE DE19712106633 patent/DE2106633A1/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012013393A1 (en) * | 2010-07-30 | 2012-02-02 | Evonik Degussa Gmbh | In-mould-foaming process using a foamable medium with outer layers, and plastics moulding obtainable therefrom |
RU2575032C2 (en) * | 2010-07-30 | 2016-02-10 | Эвоник Индустрис Аг | Method of foaming in mould with application of foamable medium and covering layers and resulting plastic moulded product |
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