AT297306B - Ring nozzle - Google Patents
Ring nozzleInfo
- Publication number
- AT297306B AT297306B AT316067A AT316067A AT297306B AT 297306 B AT297306 B AT 297306B AT 316067 A AT316067 A AT 316067A AT 316067 A AT316067 A AT 316067A AT 297306 B AT297306 B AT 297306B
- Authority
- AT
- Austria
- Prior art keywords
- ring nozzle
- nozzle
- pressure
- contamination
- smaller
- Prior art date
Links
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
- 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
- B29C48/30—Extrusion nozzles or dies
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
-
- 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
- B29C48/03—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
- B29C48/04—Particle-shaped
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Nozzles (AREA)
Description
<Desc/Clms Page number 1>
Ringdüse
EMI1.1
<Desc/Clms Page number 2>
Die erfindungsgemässe Spritzdüse ist insbesondere für gummireiche, weiche Mischungen, die wenig gefüllt sind und daher bei hohem Austrittsdruck zu stark aufgehen würden, sowie für dünnwandige
Schläuche geeignet, da die Verunreinigungen erfahrungsgemäss bei 0, 6 bis 0, 8 mm liegen.
Unter der Voraussetzung, dass die Mischung ein physikalisches Verhalten zeigt, welches zwischen einem festen Stoff (Druckfortpflanzung nur in einer Richtung) und einer Flüssigkeit (Druckfortpflanzung dreidimensional) liegt, wird der Druck in-Fi-ein Maximum erreichen und jedenfalls durch das Nach- lassen der Reibung und die Druckabnahme von der Austrittsöffnung her in-R-wesentlich kleiner sein als in-Fi-. Eine Materialverunreinigung von einer Grösse < S geht ohne Behinderung durch die
Spritzdüse durch.
Eine Materialverunreinigung, die nur etwas kleiner als aber bedeutend grösser als-S 2-ist wird kein Aufschneiden des Schlauches hervorrufen, da die Verunreinigung nahe der Ebene-R-zu liegen kommt und sich das Material bis-R-noch schliessen kann, was sich in der Praxis als besonders vorteilhaft erwiesen hat.
Schliesslich hat es sich gezeigt, dass bei Verunreinigung der Mischung durch verhältnismässig weiche Teilchen (z. B. Füllstoff od. dgl.) diese zwischen-F1 und Fi- zerrieben werden. Diese erstaunliche Leistung geht sogar so weit, dass versuchsweise absichtlich in die Mischung eingebrachte Verunreinigungen, wie Staub, den Spritzkopf klaglos passieren und kein Aufschneiden des Schlauches eintritt, sondern dass die Verunreinigungen nur bei lokaler Anhäufung zur Ausbildung eines Loches führen. Naturgemäss wird dieser Effekt umso wirksamer, je kleiner die Differenz der beiden Winkel-al und c-ge- wählt werden kann.
Die erfindungsgemässe Spritzdüse gestattet somit die Verwendung billigerer Kautschuktypen, die nicht mehr gesiebt werden müssen, für die Herstellung von Schläuchen auch dünner Wandungen.
PATENTANSPRÜCHE :
1. Ringdüse für eine. plastische Massen verarbeitende Strangpresse, die auf der Eintrittsseite eine grössereSpaltweite als auf derAustrittsseite aufweist, dadurch gekennzeichnet, dass die Querschnittsfläche der Austrittsöffnung der Ringdüse gleich oder um höchstens 10%kleiner als die Querschnittsfläche der Eintrittsöffnung ist.
<Desc / Clms Page number 1>
Ring nozzle
EMI1.1
<Desc / Clms Page number 2>
The spray nozzle according to the invention is particularly suitable for rubber-rich, soft mixtures that are not very full and would therefore open too much at high outlet pressure, as well as for thin-walled mixtures
Suitable for hoses, as experience has shown that the contamination is between 0.6 and 0.8 mm.
Provided that the mixture shows a physical behavior which lies between a solid substance (pressure propagation in one direction only) and a liquid (pressure propagation three-dimensional), the pressure in-Fi-will reach a maximum and in any case by decreasing the friction and the pressure decrease from the outlet opening in-R- can be much smaller than in-Fi-. A material contamination of a size <S passes through the without hindrance
Spray nozzle through.
A material contamination that is only slightly smaller than but significantly larger than -S 2 -will not cause the hose to be cut open, since the contamination comes to lie close to the -R- plane and the material up to -R- can still close, which is has proven to be particularly advantageous in practice.
Finally, it has been shown that if the mixture is contaminated by relatively soft particles (e.g. filler or the like), these are ground between F1 and Fi-. This astonishing achievement even goes so far that impurities that are intentionally introduced into the mixture, such as dust, pass the spray head without complaint and the hose is not cut open, but that the impurities only lead to the formation of a hole if they accumulate locally. Naturally, this effect becomes all the more effective, the smaller the difference between the two angles-al and c-can be selected.
The spray nozzle according to the invention thus allows the use of cheaper types of rubber, which no longer have to be screened, for the production of hoses even with thin walls.
PATENT CLAIMS:
1. Ring nozzle for one. Extrusion press processing plastic masses, which has a larger gap width on the inlet side than on the outlet side, characterized in that the cross-sectional area of the outlet opening of the ring nozzle is equal to or at most 10% smaller than the cross-sectional area of the inlet opening.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT316067A AT297306B (en) | 1967-03-31 | 1967-03-31 | Ring nozzle |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT316067A AT297306B (en) | 1967-03-31 | 1967-03-31 | Ring nozzle |
Publications (1)
Publication Number | Publication Date |
---|---|
AT297306B true AT297306B (en) | 1972-03-27 |
Family
ID=3546251
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT316067A AT297306B (en) | 1967-03-31 | 1967-03-31 | Ring nozzle |
Country Status (1)
Country | Link |
---|---|
AT (1) | AT297306B (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0252388A1 (en) * | 1986-06-26 | 1988-01-13 | General Electric Company | Modular extrusion head |
US4798526A (en) * | 1986-07-17 | 1989-01-17 | General Electric Company | Modular extrusion head |
DE3820907A1 (en) * | 1988-06-21 | 1989-12-28 | Battenfeld Extrusionstech | Extrusion head for the extrusion of hose-shaped or tubular preforms |
US4895744A (en) * | 1986-06-26 | 1990-01-23 | General Electric Company | Method of making a multi-layer parison |
-
1967
- 1967-03-31 AT AT316067A patent/AT297306B/en not_active IP Right Cessation
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0252388A1 (en) * | 1986-06-26 | 1988-01-13 | General Electric Company | Modular extrusion head |
WO1988000125A1 (en) * | 1986-06-26 | 1988-01-14 | General Electric Company | Modular extrusion head, method, intermediate product and product |
US4895744A (en) * | 1986-06-26 | 1990-01-23 | General Electric Company | Method of making a multi-layer parison |
US4798526A (en) * | 1986-07-17 | 1989-01-17 | General Electric Company | Modular extrusion head |
DE3820907A1 (en) * | 1988-06-21 | 1989-12-28 | Battenfeld Extrusionstech | Extrusion head for the extrusion of hose-shaped or tubular preforms |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ELJ | Ceased due to non-payment of the annual fee |