DE1239839B - Process for the continuous production of biaxially stretched tubular films - Google Patents
Process for the continuous production of biaxially stretched tubular filmsInfo
- Publication number
- DE1239839B DE1239839B DEK40872A DEK0040872A DE1239839B DE 1239839 B DE1239839 B DE 1239839B DE K40872 A DEK40872 A DE K40872A DE K0040872 A DEK0040872 A DE K0040872A DE 1239839 B DE1239839 B DE 1239839B
- Authority
- DE
- Germany
- Prior art keywords
- hose
- gas
- pair
- plastic
- seal
- 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
- 238000000034 method Methods 0.000 title claims description 24
- 238000010924 continuous production Methods 0.000 title claims description 4
- 239000004033 plastic Substances 0.000 claims description 12
- 229920003023 plastic Polymers 0.000 claims description 12
- 238000003892 spreading Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 229920001169 thermoplastic Polymers 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 239000004416 thermosoftening plastic Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims 14
- 239000011888 foil Substances 0.000 claims 3
- -1 polyethylene Polymers 0.000 claims 2
- 239000004698 Polyethylene Substances 0.000 claims 1
- 239000004743 Polypropylene Substances 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 230000008030 elimination Effects 0.000 claims 1
- 238000003379 elimination reaction Methods 0.000 claims 1
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims 1
- 239000004744 fabric Substances 0.000 claims 1
- 239000012530 fluid Substances 0.000 claims 1
- 238000005755 formation reaction Methods 0.000 claims 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims 1
- 239000002184 metal Substances 0.000 claims 1
- 230000002093 peripheral effect Effects 0.000 claims 1
- 229920000728 polyester Polymers 0.000 claims 1
- 229920000573 polyethylene Polymers 0.000 claims 1
- 238000007789 sealing Methods 0.000 claims 1
- 238000010792 warming Methods 0.000 claims 1
- 239000007788 liquid Substances 0.000 description 2
- 238000010096 film blowing Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/22—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of tubes
- B29C55/26—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of tubes biaxial
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
- B29C48/901—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
- B29C48/908—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article characterised by calibrator surface, e.g. structure or holes for lubrication, cooling or venting
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/91—Heating, e.g. for cross linking
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
- B29C48/914—Cooling drums
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0019—Combinations of extrusion moulding with other shaping operations combined with shaping by flattening, folding or bending
-
- 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
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/005—Oriented
- B29K2995/0053—Oriented bi-axially
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Description
BUNDESREPUBLIK DEUTSCHLANDFEDERAL REPUBLIC OF GERMANY
DEUTSCHESGERMAN
PATENTAMTPATENT OFFICE
AUSLEGESCHRIFTEDITORIAL
Int. Cl.:Int. Cl .:
B29dB29d
Deutsche Kl.: 39 a3 - 7/24German class: 39 a3 - 7/24
Nummer: 1 239 839Number: 1 239 839
Aktenzeichen: K 40872 X/39 a3File number: K 40872 X / 39 a3
Anmeldetag: 1. Juni 1960Filing date: June 1, 1960
Auslegetag: 3. Mai 1967Open date: May 3, 1967
Die vorliegende Erfindung betrifft ein Verfahren zur kontinuierlichen Herstellung von biaxial gestreckten Schlauchfolien aus thermoplastischen Kunststoffen, bei dem man den Kunststoff aus einer Ringschlitzdüse zu einem Schlauch auspreßt, den ausgepreßten Schlauch durch Abkühlen verfestigt, ihn anschließend auf die unterhalb des Kristallitschmelzpunktes des Kunststoffes liegende Strecktemperatur erwärmt und dann biaxial streckt, in dem man ihn mittels eines Quetschwalzenpaares über ein in dem Schlauch zwischen einer ersten Abdichtung und dem Quetschwalzenpaar als zweiter Abdichtung eingeschlossenes Spreizgas zieht und auf den ungestreckten Schlauch eine Bremskraft ausübt.The present invention relates to a process for the continuous production of biaxially stretched Tubular films made from thermoplastics, in which the plastic is extracted from an annular slot nozzle squeezes into a tube, solidifies the squeezed tube by cooling, then it to the stretching temperature below the crystallite melting point of the plastic heated and then biaxially stretched by means of a pair of squeeze rollers over one in the Hose enclosed between a first seal and the pair of nip rollers as a second seal Spreading gas pulls and exerts a braking force on the unstretched hose.
Von den Verfahren zum biaxialen Strecken von Schlauchfolien unterhalb ihres Kristallitschmelzpunktes, also in einem Temperaturbereich, in dem der thermoplastische Kunststoff bereits verfestigt ist, sind die sogenannten Folienblasverfahren gänzlich verschieden. Bei diesen erfolgt das Weiten und Längen des ausgepreßten Schlauches im Schmelzzustand. Es besteht somit ein großer Unterschied hinsichtlich des Druckes, unter welchem das im Schlauchinneren eingeschlossene Gas gehalten wird. Bei den Folienblasverfahren handelt es sich um Gasdrücke von einigen wenigen Millimetern Wassersäule, während man bei den Verfahren, denen auch das erfindungsgemäße Verfahren zuzurechnen ist, bei gleich großem Durchmesser und gleich großer Wandstärke der Schlauchfolien einen um eine bis mehrere Zehnerpotenzen höheren inneren Gasdruck aufzuwenden hat.Of the processes for the biaxial stretching of tubular films below their crystallite melting point, i.e. in a temperature range in which the thermoplastic is already solidified, the so-called blown film processes are completely different. With these the widening takes place and Lengths of the extruded tube in the melted state. There is thus a great difference in terms of the pressure under which the gas trapped inside the hose is held. The film blowing process involves gas pressures of a few millimeters of water column, while in the case of the methods to which the method according to the invention is also to be assigned, the same applies large diameter and the same wall thickness of the tubular films one by one to several Has to apply powers of ten higher internal gas pressure.
Bei einem Verfahren dieser Art ist es daher ein besonderes Problem, zu verhindern, daß das Spreizgas, welches unter einem verhältnismäßig hohen Druck steht, den im Schmelzzustand befindlichen Teil des Schlauches aufweiten kann.In a method of this type, it is therefore a particular problem to prevent the spreading gas, which is under a relatively high pressure, the melted part of the Hose can expand.
Eine bekannte Lösung des Problems besteht darin, daß man den ausgepreßten Schlauch, nachdem er
durch Abkühlung verfestigt wurde, mit einem weiteren Quetschwalzenpaar als erste Abdichtung gasdicht
abschließt, also das Spreizgas von dem im Schmelzzustand befindlichen Teil des Schlauches
fernhält. Um das Spreizgas zu Beginn des Verfahrens in das Schlauchinnere bringen und unvermeidlich
auftretende oder durch Zufälligkeiten verursachte Änderungen des Druckes des zwischen den beiden
Quetschstellen eingeschlossenen Gases ausgleichen zu können, sind verhältnismäßig umständliche Maßnahmen
und Vorrichtungen erforderlich. So hat man das erste Quetschwalzenpaar mit Ringnuten versehen,
um einen Durchgang für eine Gasleitung zu schaffen, Verfahren zur kontinuierlichen Herstellung von
biaxial gestreckten SchlauchfolienA known solution to the problem is that the squeezed tube, after it has been solidified by cooling, is sealed gas-tight with a further pair of squeezing rollers as the first seal, that is, the expanding gas is kept away from the part of the tube that is in the melted state. Relatively cumbersome measures and devices are required in order to be able to bring the expansion gas into the interior of the hose at the beginning of the process and to be able to compensate for changes in the pressure of the gas trapped between the two pinch points that are unavoidable or caused by accidents. So you have provided the first pair of squeeze rollers with annular grooves to create a passage for a gas line, a process for the continuous production of
biaxially stretched tubular films
Anmelder:Applicant:
Kalle Aktiengesellschaft,Kalle Aktiengesellschaft,
Wiesbaden-Biebrich, Rheingaustr. 190-196Wiesbaden-Biebrich, Rheingaustr. 190-196
Als Erfinder benannt:Named as inventor:
Dr. Walter Seifried,Dr. Walter Seifried,
Dipl.-Ing. Wilhelm Ott,Dipl.-Ing. Wilhelm Ott,
Dr. Peter Steinau, Wiesbaden-BiebrichDr. Peter Steinau, Wiesbaden-Biebrich
durch welche es ermöglicht wird, durch den zentralen Dorn des Spritzkopfes zugeführtes Gas in; das zwischen den beiden Quetschstellen befindliche Schlauchstück zu bringen.by means of which it is made possible to feed gas into ; to bring the piece of hose located between the two pinch points.
Es ist auch bekannt, Schlauchfolien herzustellen, indem man einen aus einer Ringschlitzdüse nach oben extrudieren Kunststoffschlauch durch eine Flüssigkeit führt und ihn dabei innerhalb dieser Flüssigkeit durch eine in dem Kunststoffschlauch eingeschlossene Gasmenge weitet und zugleich durch entsprechend schnell auf ende Abzugswalzen in die Länge dehnt. Die Flüssigkeit wird dabei auf einer Temperatur gehalten, bei der die Ausdehnung erfolgen soll. Damit der Kunststoffschlauch nicht unmittelbar nach dem Verlassen der Ringschlitzdüse durch den Druck des eingeschlossenen Gases aufgeweitet wird, wird er unmittelbar nach dem Auspressen ein kurzes Stück durch einen hohlen Zylinder geführt, welcher sich in der besagten Flüssigkeit befindet. Dieses bekannte Verfahren führt nur zu geringfügig verfestigten Schlauchfolien und ist in dieser Hinsicht den Folienblasverfahren ähnlich.It is also known to produce tubular films by one from an annular slot nozzle after Extrude plastic tubing through a liquid and thereby place it inside it Liquid expands through an amount of gas enclosed in the plastic tube and at the same time through expands accordingly quickly on the end of the take-off rollers. The liquid is thereby on a Maintained temperature at which the expansion is to take place. So that the plastic hose is not immediately after leaving the ring slot nozzle, it is expanded by the pressure of the enclosed gas it is passed a short distance through a hollow cylinder immediately after it has been pressed out, which is in said liquid. This known method leads only slightly solidified tubular films and in this respect is similar to blown film processes.
Man kennt auch bereits ein Verfahren, bei dem zur Herstellung von Rohren aus thermoplastischen Kunststoffen die aus einer Ringschlitzdüse extrudierte rohrförmige Kunststoffmasse über eine gekühlte Form geführt wird. Der Zweck dieser Form ist es, das extrudierte Rohr durch Abkühlen zu verfestigen und seine lichte Weite gleichmäßig einzustellen.One already knows a method in which to manufacture pipes from thermoplastic Plastics the tubular plastic mass extruded from an annular slot nozzle via a cooled Shape is guided. The purpose of this shape is to solidify the extruded tube by cooling it and adjust its clear width evenly.
Der Erfindung liegt die Aufgabe zugrunde, bei einem Verfahren der eingangs beschriebenen Art auf einfache Weise zu verhindern, daß das unter vergleichsweise hohem Druck stehende Spreizgas den im Schmelzzustand befindlichen Teil des Schlauches ausdehnt. Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die erste Abdichtung mittels derThe invention is based on the object in a method of the type described at the outset easy way to prevent that the expanding gas is under comparatively high pressure in the The melted part of the hose expands. This object is achieved according to the invention solved that the first seal by means of the
709 578/309709 578/309
Claims (1)
genden unter Bezugnahme auf die Fig. 1 bis 3 derThe method according to the invention is defined in the following claim
with reference to Figs. 1 to 3 of the
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEK40872A DE1239839B (en) | 1960-06-01 | 1960-06-01 | Process for the continuous production of biaxially stretched tubular films |
| GB19852/61A GB977473A (en) | 1960-06-01 | 1961-06-01 | Improvements in and relating to the manufacture of biaxially stretched tubular films |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEK40872A DE1239839B (en) | 1960-06-01 | 1960-06-01 | Process for the continuous production of biaxially stretched tubular films |
| FR863620A FR1290714A (en) | 1961-06-01 | 1961-06-01 | Continuous process for manufacturing biaxially stretched plastic tubes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1239839B true DE1239839B (en) | 1967-05-03 |
Family
ID=25983277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEK40872A Pending DE1239839B (en) | 1960-06-01 | 1960-06-01 | Process for the continuous production of biaxially stretched tubular films |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE1239839B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4443399A (en) * | 1981-05-07 | 1984-04-17 | Idemitsu Petrochemical Co., Ltd. | Method of producing biaxially oriented sheet or film and apparatus therefor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB787479A (en) * | 1955-06-03 | 1957-12-11 | Ici Ltd | Improvements in the manufacture of tubular film |
| FR1217997A (en) * | 1957-12-23 | 1960-05-06 | Union Carbide Corp | Method and apparatus for two-axis stretching of thermoplastic products |
-
1960
- 1960-06-01 DE DEK40872A patent/DE1239839B/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB787479A (en) * | 1955-06-03 | 1957-12-11 | Ici Ltd | Improvements in the manufacture of tubular film |
| FR1217997A (en) * | 1957-12-23 | 1960-05-06 | Union Carbide Corp | Method and apparatus for two-axis stretching of thermoplastic products |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4443399A (en) * | 1981-05-07 | 1984-04-17 | Idemitsu Petrochemical Co., Ltd. | Method of producing biaxially oriented sheet or film and apparatus therefor |
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