DE887262C - Process for drying films made from regenerated cellulose - Google Patents
Process for drying films made from regenerated celluloseInfo
- Publication number
- DE887262C DE887262C DEL8927A DEL0008927A DE887262C DE 887262 C DE887262 C DE 887262C DE L8927 A DEL8927 A DE L8927A DE L0008927 A DEL0008927 A DE L0008927A DE 887262 C DE887262 C DE 887262C
- Authority
- DE
- Germany
- Prior art keywords
- regenerated cellulose
- films made
- drying
- drying films
- film web
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
-
- 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
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Moulding By Coating Moulds (AREA)
Description
Verfahren zum Trocknen von Folien aus regenerierter Cellulose Bei der Herstellung von Folien aus regenerierter Cellulose ist es erforderlich, <die aus der Naßpartie heraustretende Folienbahn zu trocknen. Diese Trocknung erfolgt im allgemeinen durch Kontakttrocknung auf einer Reihe von beheizten Walzenpaaren. Beim Trocknen treten dabei starke Sehrumpfungen auf, so daß in der Folienbahn gespannt und ungespannte Zonen auftreten. Dadurch entstehen nicht nur Ungleichmäßigkeiten in der Dicke der Folien, sondern auch stark unregelmäßige Festigkeitseigenschaften, die nicht überall gleichmäßig und auch in der Längsrichtung meist wesentlich größer als in der Querrichtung sind.Process for drying films made from regenerated cellulose In the Production of films from regenerated cellulose is required <the to dry emerging from the wet end film web. This drying takes place generally by contact drying on a series of heated pairs of rollers. During the drying process, severe wrinkles occur, so that the film web is taut and unstrained zones occur. This not only creates irregularities in the thickness of the foils, but also strongly irregular strength properties, which are not uniform everywhere and also usually much larger in the longitudinal direction than are in the transverse direction.
Ferner werden verdickte Stellen durch ,die Querschrumpfung noch verstärkt ausgebildet. Diese Nachteile haben zur Folge, daß die Weiterverarbeitung der Folien sehr erschwert ist.Furthermore, thickened areas are reinforced by the transverse shrinkage educated. These disadvantages have the consequence that the further processing of the films is very difficult.
Der Gegenstand ,der Erfindtung bezieht sich n.un auf ein Verfahren zum Trocknen von Folien aus regenerierter Cellulose, bei welchem die vorgenannten Nachteile dadurch vermieden wenden, daß die aus der Naßpartie gelangende, zu trockwende Folienbahn an den Rändern festgchalten und frei tragend durch einen beildseitig einwirkenden Trockenluftstrom hindurchgeführt wird. Die Temperatur ,des Trockenluftstromes wird dabei entsprechend dem Fortschritt der Trocknung nach Bedarf gestenert. Außerdem erfolgt das Hindurchführen unter stetiger oder einstellbarer Ouerspannung dadurch Einspannen der seitlichen Ränder der Folienbahn, so daß deren Schrumpfen während des Trockenvorganges unterbunden wird. Die Längs- und Querspannung ist dabei anfangs wegen des gequollenen Zustandes der noch nassen Folie gering und steigt während der Trocknung allmäh-I.ich so an, <daß nach Beendigung des Trockenvorganges die Folienbahn vollkommen glatt und eben ist. The subject, the invention now relates to a process for drying films made of regenerated cellulose, in which the aforementioned Avoid disadvantages by turning the one coming out of the wet end to be dried The film web is fixed at the edges and freely supported by one on both sides acting dry air flow is passed through. The temperature of the dry air flow is starred as required according to the progress of the drying process. aside from that the passage takes place under constant or adjustable cross tension Clamping the side edges of the film web, so that their shrinkage during the drying process is prevented. The longitudinal and transverse tension is the beginning because of the swollen state of the still wet film low and gradually increases during drying so that <that after completion of the drying process the film web is perfectly smooth and level.
Auf diese Weise werden die Dicke der Folien in der Querrichtung gleichmäßiger sowie die Festigkeitseigenschaften wesentlich verbessert. Uberspannte Stellen bzw. sogenannte Trockenzonen werden dadurch zuverlässig vermieden. Vendickte Stellen, wie sie beim Schrumpfen häufig vorkommen, treten nicht auf, weil diese Dadurch die dauernd einwirkende Querspannung verffieß en. In this way, the thickness of the films in the transverse direction becomes more uniform and the strength properties are significantly improved. Overstretched places or So-called dry zones are reliably avoided. Thickened areas, as they often occur with shrinking, do not occur because this causes the continuously acting transverse tension dissipated.
Nach dem Trocknen wird also eine vollkommen glatte und ebene Folienbahn erhalten, so daß die Weiterverarbeitung wesentlich erleichtert ist un.d außerdem auch keine Abfälle durch unregelmäßig anfallende Folienzonen entstehen.After drying, a completely smooth and even sheet of film is obtained received, so that the further processing is much easier and also there is also no waste from irregularly occurring film zones.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEL8927A DE887262C (en) | 1951-05-03 | 1951-05-03 | Process for drying films made from regenerated cellulose |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEL8927A DE887262C (en) | 1951-05-03 | 1951-05-03 | Process for drying films made from regenerated cellulose |
Publications (1)
Publication Number | Publication Date |
---|---|
DE887262C true DE887262C (en) | 1953-08-20 |
Family
ID=7257771
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEL8927A Expired DE887262C (en) | 1951-05-03 | 1951-05-03 | Process for drying films made from regenerated cellulose |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE887262C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1180511B (en) * | 1960-09-26 | 1964-10-29 | Basf Ag | Process for post-drying of film webs made of polyvinyl chloride and vinyl chloride copolymers produced on a film casting machine |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE582412C (en) * | 1929-09-27 | 1933-08-16 | I G Farbenindustrie Akt Ges | Apparatus for making films |
DE654299C (en) * | 1932-10-24 | 1937-12-18 | Norddeutsche Seekabelwerke Ag | Production of flexible strips or foils made of polystyrene o. |
DE703917C (en) * | 1936-07-01 | 1941-03-19 | I G Farbenindustrie Akt Ges | Process for stretching films or tapes made of organic thermoplastic materials |
-
1951
- 1951-05-03 DE DEL8927A patent/DE887262C/en not_active Expired
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE582412C (en) * | 1929-09-27 | 1933-08-16 | I G Farbenindustrie Akt Ges | Apparatus for making films |
DE654299C (en) * | 1932-10-24 | 1937-12-18 | Norddeutsche Seekabelwerke Ag | Production of flexible strips or foils made of polystyrene o. |
DE703917C (en) * | 1936-07-01 | 1941-03-19 | I G Farbenindustrie Akt Ges | Process for stretching films or tapes made of organic thermoplastic materials |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1180511B (en) * | 1960-09-26 | 1964-10-29 | Basf Ag | Process for post-drying of film webs made of polyvinyl chloride and vinyl chloride copolymers produced on a film casting machine |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CH428187A (en) | Method and apparatus for the continuous stretching and stretching of synthetic polymer films | |
US1975708A (en) | Method and apparatus fob drying | |
DE1045353B (en) | Method for decorating a web, in particular a fabric web | |
DE887262C (en) | Process for drying films made from regenerated cellulose | |
DE1266233B (en) | Roller mounting of a roller dryer for strip-shaped goods | |
US2305658A (en) | Films | |
DE1504442B2 (en) | PROCESS FOR THE CONTINUOUS MANUFACTURING OF TRANSPARENT FILM WEBS WITH HIGH STRENGTH FROM POLYVINYL ALCOHOL | |
DE2127869B2 (en) | Manufacture of cellulose film | |
DE1263979B (en) | Process for drying flat material, especially leather | |
DE582721C (en) | Method for drying tapes | |
DE1126127B (en) | Device for heat treatment of thermoplastic plastic webs | |
DE605404C (en) | Process for the production of intermediate layers from nitrocellulose for shatterproof glass | |
DE638406C (en) | Method and device for gluing paper | |
DE1504608B2 (en) | PROCESS FOR MANUFACTURING VIAXIALLY ORIENTED POLY PROPYLENE FILMS | |
DE484602C (en) | Machine for duplicating and vulcanizing rubber mats, etc. like | |
DE543765C (en) | Device for the production of films from cellulose solutions | |
DE1133621B (en) | Process for increasing the stretchability or elasticity of a tape or sheet made of solid paper or plastic material | |
DE1943216A1 (en) | Casting plastics film and sheet | |
AT289370B (en) | Process for the production of wooden plasters | |
DE472842C (en) | Process and device for producing paper that is smooth on one side | |
DE2008442C3 (en) | Process for removing surface tack from plasticized polyvinyl butyral films | |
DE735234C (en) | Process for finishing fresh wood veneers | |
DE542935C (en) | Method and apparatus for treating unprinted sheets or paper webs prior to printing | |
DE607011C (en) | Process for producing paper of a certain thickness across its entire width in the paper machine | |
DE521902C (en) | Device for drying cellulose films |