DE803017C - Process for the production of hollow fiber bodies - Google Patents
Process for the production of hollow fiber bodiesInfo
- Publication number
- DE803017C DE803017C DEP21799D DEP0021799D DE803017C DE 803017 C DE803017 C DE 803017C DE P21799 D DEP21799 D DE P21799D DE P0021799 D DEP0021799 D DE P0021799D DE 803017 C DE803017 C DE 803017C
- Authority
- DE
- Germany
- Prior art keywords
- production
- hollow fiber
- fiber bodies
- molding
- pulp
- 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.)
- Expired
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
- D21J3/00—Manufacture of articles by pressing wet fibre pulp, or papier-mâché, between moulds
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Paper (AREA)
Description
In dem Patent 803016 ist beschrieben, daß Faserstoffhohlkörper hoher Festigkeit von im wesentlichen zylindrischer, prismatischer oder schlank konischer Form dadurch hergestellt werden können, daß ein Faserstoff-Fonnling, der an einer Siebform mit hoher Entwässerungsgeschwindigkeit niedergeschlagen ist, durch eine Vortrocknung auf mindestens 30 °/o und höchstens 70 °/o Trockengehalt gebracht und danach in einer heizbaren Preßvorrichtung, die den wesentlichen Teil seiner Mantelfläche örtlich fortschreitend erfaßt, in einem einzigen Arbeitsgang im Verhältnis von mindestens 2 : 1 verdichtet und fertiggetrocknet wird.In the patent 803016 is described that fibrous hollow body high strength of essentially cylindrical, prismatic or slim conical shape can be produced thereby, that a fibrous material form, which is deposited on a sieve mold with high dewatering speed is brought to a dry content of at least 30 ° / o and at most 70 ° / o by pre-drying and then in a heatable pressing device, which covers the essential part of its outer surface locally progressive, compacted in a single operation in a ratio of at least 2: 1 and is completely dried.
Dabei wurde schon darauf hingewiesen, daß die Vortrocknung in der Entwässerungsvorrichtung erfolgen kann, indem in dieselbe Heißluft oder ein sonstiges gasförmiges Heizmittel eingeführt wird, das die Wandung des Formlings durchdringt und dabei, je nach der erzielten Durchströmgeschwindigkeit, auch schon mechanisch einen Teil des Porenwassers mitreißt.It has already been pointed out that the pre-drying takes place in the dewatering device can by introducing hot air or some other gaseous heating medium into the same, which penetrates the wall of the molding and, depending on the flow rate achieved, also mechanically entrains part of the pore water.
Auf Grund eingehender Versuche ist es neuerdings gelungen, bei Hohlkörpern, die eine einfache, das Verfahren begünstigende Form und eine geringe bis mittlere Wandstärke besitzen, den für die nachfolgende Preßtrocknung erforderlichen mittleren Trockengehalt von mindestens 30 °/o dadurch zu erreichen, daß man entweder ein ungeheiztes luftförmiges Druckmittel durch den Faserniederschlag, der sich auf der Siebform gebildet hat, hindurchpreßt oder einen Formstempel mit solcher Kraft gegen den Formling drückt, daß ein erheblicher Teil des Porenwassers durch mechanischen Druck entfernt wird.On the basis of in-depth experiments, it has recently been possible to use hollow bodies that have a simple, the process favoring shape and have a low to medium wall thickness for the subsequent press drying required mean dry content of at least 30% to achieve that one is either an unheated air-shaped Pressing pressure medium through the fiber deposit which has formed on the screen form or a forming punch presses against the molding with such force that a considerable part the pore water is removed by mechanical pressure.
Dadurch ist es möglich geworden, in solchen günstig liegenden Fällen auf eine besondere unter Wärmezufuhr erfolgende Zwischentrockung im Sinne des Hauptpatents zu verzichten und den der Entwässerungsform entnommenen Formling unmittelbar danach der erfindungsgemässen heizbaren Preßvorrichtung zuzuführen. Der dabei erzielte Vorteil besteht in einer Vereinfachung der Fabrikation und in einer Einsparung von Raum und Wärme.This has made it possible to rely on a special under in such favorable cases To dispense with heat supply taking place intermediate drying in the sense of the main patent and that of the Dewatering mold removed molding immediately after the inventive heatable Feed pressing device. The advantage achieved here is a simplification of manufacture and in a saving of space and heat.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP21799D DE803017C (en) | 1948-11-16 | 1948-11-16 | Process for the production of hollow fiber bodies |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP21799D DE803017C (en) | 1948-11-16 | 1948-11-16 | Process for the production of hollow fiber bodies |
Publications (1)
Publication Number | Publication Date |
---|---|
DE803017C true DE803017C (en) | 1951-02-26 |
Family
ID=7368437
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEP21799D Expired DE803017C (en) | 1948-11-16 | 1948-11-16 | Process for the production of hollow fiber bodies |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE803017C (en) |
-
1948
- 1948-11-16 DE DEP21799D patent/DE803017C/en not_active Expired
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