CH351748A

CH351748A - Viscose sponge and process for its manufacture

Info

Publication number: CH351748A
Authority: CH
Inventors: Josef Dr Buchkremer
Original assignee: Glanzstoff Ag
Priority date: 1954-03-15
Filing date: 1955-02-25
Publication date: 1961-03-15
Also published as: BE535967A; NL89744C; FR1119565A; GB765542A

Description

  

  
 



  Viskoseschwamm und Verfahren zu seiner Herstellung
Die bekannten Viskoseschwämme, die für die Verwendung zur Körperpflege oder im Haushalt vorgesehen sind, zeigen eine Aussenhaut, die zwar eine geringere Anzahl von groben Poren aufweist, im übrigen aber die gleiche Beschaffenheit und Dichte hat wie das Innere des Schwammes. Beim Einsatz derartiger Schwämme in Bodenreinigungsgeräte, wie Schrubber usw., hat es sich gezeigt, dass die Schwämme leicht einreissen. Insbesondere ist die Aussenhaut nicht den Beanspruchungen gewachsen, denen sie bei Einklemmen in die Reinigungsgeräte ausgesetzt ist.



   Man hat versucht, die besonders beanspruchten Seiten der Schwämme durch Auftragen von Anstrichmitteln, z. B. Kollodiumwolle, Gummilösung und dergleichen, zu verstärken. Doch blättern diese schwammfremden Mittel leicht ab. Ausserdem bilden sie eine nahezu wasserundurchlässige Schicht und verhindern ein Durchspülen des Schwammes.



   Es wurde nun gefunden, dass Viskoseschwämme, die zu ihrer Verstärkung mit einer aus Viskose hergestellten Aussenhaut aus regenerierter Cellulose versehen sind, diese Nachteile nicht zeigen. Zur Erzeugung einer solchen Aussenhaut geht man z. B. so vor, dass man die   Hohlformen,    in denen die Schwämme erzeugt werden, vor dem Einbringen der eigentlichen Schwamm-Masse mit einer Viskose mit höherem Cellulosegehalt als demjenigen der Masse ausstreicht. Anschliessend werden die Formen mit der -Schwamm-Masse gefüllt, worauf der Inhalt der Formen in an sich bekannter Weise zersetzt wird. Die Stärke und Dichte der Aussenhaut hängt von der Konzentration der Viskose, von ihrer Reife und der Dicke des Aufstriches ab. Es lassen sich durch Wahl der geeigneten Bedingungen je nach Bedarf feine bis lederartige Aussenhäute erzielen.



   Man kann diese Aussenhautverstärkung auch durch Aufstreichen von Viskose auf bereits gebildete Schwämme erzielen, wobei der Cellulosegehalt des Aufstriches höher gewählt ist als derjenige der damit bestrichenen Schwämme, wobei diese Schwämme dann anschliessend nochmals in ein Zersetzungsbad gebracht werden.



   Zweckmässig wählt man zur Herstellung dieser Aussenhaut Viskosen mit einem verhältnismässig hohen Cellulosegehalt von z. B. einer Zusammensetzung   10: 6,8    Cellulose : Alkali.  



   PATENTANSPRÜCHE
I. Viskoseschwamm, dadurch gekennzeichnet, dass er eine zu seiner Verstärkung dienende, aus Viskose hergestellte Aussenhaut aus regenerierter Cellulose aufweist.



   II. Verfahren zur Herstellung eines Viskoseschwammes nach Patentanspruch I, dadurch gekennzeichnet, dass man zur Erzeugung der Aussenhaut eine Viskose mit einem Cellulosegehalt von mehr als   9 O/o    verwendet.



   UNTERANSPRÜCHE
1. Verfahren nach Patentanspruch II, dadurch gekennzeichnet, dass man eine Hohlform mit der Viskose für die Aussenhaut aus streicht, hierauf die Hohlform mit der Viskose für den von der Aussenhaut umschlossenen Teil des Schwammes ausfüllt, worauf das Ganze koaguliert und zersetzt wird.



   2. Verfahren nach Patentanspruch II, dadurch gekennzeichnet, dass man einen fertigen Viskoseschwamm mit einer Schicht der Viskose für die Aussenhaut bedeckt und diese Schicht durch Einbringen in ein Zersetzungsbad koaguliert und zersetzt. 

**WARNUNG** Ende DESC Feld konnte Anfang CLMS uberlappen**.



   



  
 



  Viscose sponge and process for its manufacture
The known viscose sponges, which are intended for use in personal hygiene or in the household, have an outer skin which, although it has a smaller number of coarse pores, is otherwise of the same texture and density as the interior of the sponge. When using such sponges in floor cleaning devices, such as scrubbers, etc., it has been shown that the sponges tear easily. In particular, the outer skin cannot cope with the stresses to which it is exposed when it is trapped in the cleaning devices.



   Attempts have been made to protect the particularly stressed sides of the sponges by applying paints, e.g. B. collodion wool, rubber solution and the like to reinforce. But these non-sponging agents peel off easily. They also form an almost water-impermeable layer and prevent the sponge from being flushed through.



   It has now been found that viscose sponges which are provided with an outer skin made from viscose made of regenerated cellulose for their reinforcement do not show these disadvantages. To produce such an outer skin, z. B. in such a way that the hollow forms in which the sponges are produced are smeared with a viscose with a higher cellulose content than that of the mass before the actual sponge mass is introduced. The molds are then filled with the sponge mass, whereupon the contents of the molds are decomposed in a manner known per se. The thickness and density of the outer skin depends on the concentration of the viscose, its ripeness and the thickness of the spread. By choosing the appropriate conditions, fine to leather-like outer skins can be achieved as required.



   This reinforcement of the outer skin can also be achieved by spreading viscose on sponges that have already formed, the cellulose content of the spread being higher than that of the sponges coated with it, these sponges then being placed again in a decomposition bath.



   It is expedient to choose viscose with a relatively high cellulose content of z. B. a composition 10: 6.8 cellulose: alkali.



   PATENT CLAIMS
I. Viscose sponge, characterized in that it has an outer skin made from viscose and made from regenerated cellulose, which serves to reinforce it.



   II. Process for the production of a viscose sponge according to claim I, characterized in that a viscose with a cellulose content of more than 9% is used to produce the outer skin.



   SUBCLAIMS
1. The method according to claim II, characterized in that a hollow shape with the viscose for the outer skin is painted, then the hollow shape is filled with the viscose for the part of the sponge enclosed by the outer skin, whereupon the whole is coagulated and decomposed.



   2. The method according to claim II, characterized in that a finished viscose sponge is covered with a layer of the viscose for the outer skin and this layer is coagulated and decomposed by placing it in a decomposition bath.

** WARNING ** End of DESC field could overlap beginning of CLMS **.

Claims

** WARNING ** Beginning of CLMS field could overlap end of DESC **.

Viscose sponge and process for its manufacture The known viscose sponges, which are intended for use in personal hygiene or in the household, have an outer skin which, although it has a smaller number of coarse pores, is otherwise of the same texture and density as the interior of the sponge. When using such sponges in floor cleaning devices, such as scrubbers, etc., it has been shown that the sponges tear easily. In particular, the outer skin cannot cope with the stresses to which it is exposed when it is trapped in the cleaning devices.

Attempts have been made to protect the particularly stressed sides of the sponges by applying paints, e.g. B. collodion wool, rubber solution and the like to reinforce. But these non-sponging agents peel off easily. They also form an almost water-impermeable layer and prevent the sponge from being flushed through.

It has now been found that viscose sponges which are provided with an outer skin made from viscose made of regenerated cellulose for their reinforcement do not show these disadvantages. To produce such an outer skin, z. B. in such a way that the hollow forms in which the sponges are produced are smeared with a viscose with a higher cellulose content than that of the mass before the actual sponge mass is introduced. The molds are then filled with the sponge mass, whereupon the contents of the molds are decomposed in a manner known per se. The thickness and density of the outer skin depends on the concentration of the viscose, its ripeness and the thickness of the spread. By choosing the appropriate conditions, fine to leather-like outer skins can be achieved as required.

This reinforcement of the outer skin can also be achieved by spreading viscose on sponges that have already formed, the cellulose content of the spread being higher than that of the sponges coated with it, these sponges then being placed again in a decomposition bath.

It is expedient to choose viscose with a relatively high cellulose content of z. B. a composition 10: 6.8 cellulose: alkali.

PATENT CLAIMS I. Viscose sponge, characterized in that it has an outer skin made from viscose and made from regenerated cellulose, which serves to reinforce it.

II. Process for the production of a viscose sponge according to claim I, characterized in that a viscose with a cellulose content of more than 9% is used to produce the outer skin.

SUBCLAIMS 1. The method according to claim II, characterized in that a hollow shape with the viscose for the outer skin is painted, then the hollow shape is filled with the viscose for the part of the sponge enclosed by the outer skin, whereupon the whole is coagulated and decomposed.

2. The method according to claim II, characterized in that a finished viscose sponge is covered with a layer of the viscose for the outer skin and this layer is coagulated and decomposed by placing it in a decomposition bath.