DE886563C - Process for the production of molded articles from fiber suspensions - Google Patents
Process for the production of molded articles from fiber suspensionsInfo
- Publication number
- DE886563C DE886563C DEH3818D DEH0003818D DE886563C DE 886563 C DE886563 C DE 886563C DE H3818 D DEH3818 D DE H3818D DE H0003818 D DEH0003818 D DE H0003818D DE 886563 C DE886563 C DE 886563C
- Authority
- DE
- Germany
- Prior art keywords
- production
- curing
- drying
- fiber suspensions
- moldings
- 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)
- Dry Formation Of Fiberboard And The Like (AREA)
Description
Zierfahren zur Herstellung von Formkörpern aus Faserstoffaufschwemmungen Gegenstand des Patents 880 542 ist ein Verfahren zur Herstellung von Formkörpern aus Faserstoffaufschwemmungen durch Formen, Entwässern, Trocknen und Aushärten, gegebenenfalls in Gegenwart von härtbaren Bindemitteln, gemäß welchem das Aushärten und vorzugsweise auch das Trocknen der Formkörper im Hochfrequenzfeld, gegebenenfalls unter gleichzeitiger Anwendung von gleichbleibendem oder zunehmendem Preßdruck durchgeführt wird. Eine solche Durchführung des Aushärtens und vorzugsweise auch des Trocknens bietet den bekannten Verfahren zur Herstellung von Formkörpern aus Faserstoffaufschwemmungen gegenüber insbesondere den Vorteil, daß dabei eine viel gleichmäßigere Aushärtung und Trocknung erzielt werden kann, daß keine Schichtbildung und Spannungen in den ausgehärteten Formkörpern auftreten und daß außerordentlich kurze Behandlungszeiten erreicht werden können. In besonders zweckmäßiger Weise wird dabei derart vorgegangen, daß die Behandlung im Hochfrequenzfeld in zwei Stufen durchgeführt wird, derart, daß der Hochfrequenzstrom in der ersten Stufe in der Hauptebene der Formkörper und in der zweiten Stufe bei verringertem Elektrodenabständ ungefähr senkrecht zur Hauptebene der Formkörper hindurchgeleitet wird. In Verfolg weiterer Arbeiten wurde gefunden, daß das Verfahren gemäß Hauptpatent dann zu besonders vorteilhaften Ergebnissen führt, wenn man das Trocknen und Aushärten zumindest zeitweilig unter Unterdruck vornimmt. Hierdurch wird beim Verfahren des Hauptpatents eine Abkürzung der Behandlungszeit, eine Entfernung der entstehenden Dämpfe und eine Steigerung der Gleichmäßigkeit der danach hergestellten Formkörper erreicht.Decorative process for the production of moldings from fiber suspensions The subject of patent 880 542 is a process for the production of moldings from fiber suspensions by molding, dewatering, drying and curing, optionally in the presence of curable binders, according to which the curing and preferably also the drying of the moldings in a high-frequency field , optionally with simultaneous application of constant or increasing pressure. Carrying out curing and preferably also drying in this way offers the known processes for the production of moldings from fiber suspensions, in particular, the advantage that a much more uniform curing and drying can be achieved, that no layer formation and stresses occur in the cured moldings and that extremely short treatment times can be achieved. In a particularly expedient manner, the procedure is such that the treatment in the high-frequency field is carried out in two stages, in such a way that the high-frequency current is passed through in the first stage in the main plane of the shaped body and in the second stage with a reduced electrode spacing approximately perpendicular to the main plane of the shaped body . In the course of further work, it was found that the process according to the main patent leads to particularly advantageous results if drying and curing are carried out at least temporarily under reduced pressure. As a result, in the process of the main patent, the treatment time is shortened, the vapors formed are removed and the uniformity of the molded bodies produced thereafter is increased.
Diese erfindungsgemäß erzielbaren Vorteile wirken sich dabei für die Herstellung von spezifisch leichten Formkörpern vorteilhaft aus, da bei den üblichen Heißluft- und Dampftrockenverfahren die Entfernung der bis etwa 8o °/o betragenden Feuchtigkeit nur langsam vor sich geht und auch die Aushärtung der Bindemittel erhebliche Zeit in Anspruch nimmt. Auch bei dichten, jedoch dickeren Platten und komplizierten Formkörpern, ist eine Abkürzung der Behandlungszeiten und eine wirtschaftlichere Ausnutzung der Formen möglich.These advantages that can be achieved according to the invention are effective for the Production of specifically light moldings from advantageous, since the usual Hot-air and steam-drying processes remove up to about 80 per cent Moisture is slow and the curing of the binder is considerable Takes time. Even with dense, but thicker panels and complex ones Shaped bodies, is a shortening of the treatment times and a more economical one Utilization of the forms possible.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEH3818D DE886563C (en) | 1942-05-09 | 1942-05-09 | Process for the production of molded articles from fiber suspensions |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEH3818D DE886563C (en) | 1942-05-09 | 1942-05-09 | Process for the production of molded articles from fiber suspensions |
Publications (1)
Publication Number | Publication Date |
---|---|
DE886563C true DE886563C (en) | 1953-08-17 |
Family
ID=7143752
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEH3818D Expired DE886563C (en) | 1942-05-09 | 1942-05-09 | Process for the production of molded articles from fiber suspensions |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE886563C (en) |
-
1942
- 1942-05-09 DE DEH3818D patent/DE886563C/en not_active Expired
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