DE1276907B - Process for the production of curved tubes for large pneumatic tube systems - Google Patents
Process for the production of curved tubes for large pneumatic tube systemsInfo
- Publication number
- DE1276907B DE1276907B DE1962D0043858 DED0043858A DE1276907B DE 1276907 B DE1276907 B DE 1276907B DE 1962D0043858 DE1962D0043858 DE 1962D0043858 DE D0043858 A DED0043858 A DE D0043858A DE 1276907 B DE1276907 B DE 1276907B
- Authority
- DE
- Germany
- Prior art keywords
- plastic
- reinforcement
- pipe
- production
- wrapped
- 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
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
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/56—Winding and joining, e.g. winding spirally
- B29C53/58—Winding and joining, e.g. winding spirally helically
- B29C53/583—Winding and joining, e.g. winding spirally helically for making tubular articles with particular features
- B29C53/585—Winding and joining, e.g. winding spirally helically for making tubular articles with particular features the cross-section varying along their axis, e.g. tapered, with ribs, or threads, with socket-ends
-
- 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
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/56—Winding and joining, e.g. winding spirally
- B29C53/58—Winding and joining, e.g. winding spirally helically
- B29C53/581—Winding and joining, e.g. winding spirally helically using sheets or strips consisting principally of plastics material
-
- 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
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/56—Winding and joining, e.g. winding spirally
- B29C53/58—Winding and joining, e.g. winding spirally helically
- B29C53/583—Winding and joining, e.g. winding spirally helically for making tubular articles with particular features
- B29C53/588—Winding and joining, e.g. winding spirally helically for making tubular articles with particular features having a non-linear axis, e.g. elbows, toroids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2009/00—Layered products
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Description
Verfahren zur Herstellung von gekrümmten Fahrrohren für Großrohrpostanlagen Die Fahrrohre von Großrohrpostanlagen bestehen im allgemeinen aus Asbestzement. Diese Fahrrohre sind zwar korrosionsfest und verhältnismäßig preiswert. Sie sind jedoch ziemlich schwer. Außerdem erreichen Asbestzementrohre erst im Betrieb die gewünschte glatte Oberfläche. Ferner müssen an den Kupplungsstößen Spalten von etwa 2 bis 4 mm Größe vorgesehen werden, da sich Asbestzement infolge Feuchtigkeitsaufnahme geringfügig ausdehnt.Process for the production of curved travel tubes for large pneumatic tube systems The tubes of large pneumatic tube systems generally consist of asbestos cement. These driving tubes are corrosion-resistant and relatively inexpensive. they are but quite difficult. In addition, asbestos-cement pipes only reach the during operation desired smooth surface. Furthermore, gaps of about 2 to 4 mm in size should be provided, as asbestos cement is due to moisture absorption expands slightly.
Der Ersatz von Asbestzementrohren durch Stahlrohre für die Rohrpostleitungen kommt bisher nicht in Betracht, da Stahlrohre korrodieren. Außerdem können in Stahl noch keine faltenlose Rohrkrümmer hergestellt werden. The replacement of asbestos-cement pipes with steel pipes for pneumatic tube lines has not been considered so far, as steel pipes corrode. It can also be made in steel no fold-free pipe elbows have yet been manufactured.
Die Verwendung von Kunststoff für die Großrohrpostleitungen scheiterte bisher daran, daß die Kunststoffindustrie Rohre, insbesondere Krümmer, mit den - erforderlichen Rohrdurchmessern von bis zu 500 mm oder mehr nicht liefern kann. Es kommt hinzu, daß der Preis für Kunststoffrohre sehr hoch liegen müßte, zumal thermoplastische Kunststoffe infolge ihres kleinen Elastizitätsmoduls größere Wandstärken erfordern als Metall. The use of plastic for the large pneumatic tubes failed so far that the plastics industry has pipes, especially elbows, with the - Cannot deliver the required pipe diameters of up to 500 mm or more. In addition, the price for plastic pipes would have to be very high, especially since Thermoplastics have greater wall thicknesses due to their small modulus of elasticity require than metal.
Es ist jedoch bekannt, Rohrformstücke wie Krümmer oder T-Stücke, dadurch herzustellen, daß man einen geteilten Kern oder aber einen biegsamen Kern mit Faserbändern oder Fasern umwickelt, die Fasern mit Harz imprägniert, dieses dann härtet und den Kern aus dem gehärteten Rohrstück herausnimmt. However, it is known to use pipe fittings such as elbows or T-pieces, by producing a split core or a flexible core wrapped with fiber tapes or fibers, the fibers impregnated with resin, this then hardens and removes the core from the hardened pipe section.
Die Erfindung liefert nun ein Verfahren zur Herstellung von gekrümmten Fahrrohren mit Innendurchmesser von etwa 500 mm und mehr für Großrohrpostanlagen, bei dem von Kunststoff Gebrauch gemacht wird. The invention now provides a method for producing curved Driving tubes with an inner diameter of around 500 mm and more for large pneumatic tube systems, where plastic is used.
Erfindungsgemäß wird ein Kunststoffband wendelförmig eng auf einen zweckmäßig mehrteiligen Kriimmerdorn gewickelt, dann die wendelförmige Naht in dieser Lage verschweißt, verschmolzen oder verklebt und außen der Krümmer mit einer oder mehreren Verstärkungslagen versehen, bevor der Dorn entfernt wird. According to the invention, a plastic band is helically tight on one expediently wound multi-part Kriimmerdorn, then the helical seam in this Welded, fused or glued layer and the outside of the manifold with an or several layers of reinforcement before the mandrel is removed.
Das Verfahren zur Krümmerherstellung nach der Erfindung hat den besonderen Vorteil, daß zur Herstellung der eigentlichen Grundform des Rohres nur verhältnismäßig wenig hochwertiger und daher teurer Formstoff gebraucht wird, der hinsichtlich geringer Oberflächenrauhigkeit und Abriebfestigkeit für Fahrrohre geeignet ist, während das Widerstandsmoment von anderen dafür besser geeigneten und besonders geformten Stoffen erzeugt wird. The method for manufacturing manifolds according to the invention has a special one Advantage that to produce the actual basic shape of the tube only relatively little high quality and therefore more expensive molding material is needed, which is lower in terms of Surface roughness and abrasion resistance is suitable for driving tubes, while the Moment of resistance of other specially shaped materials that are more suitable for this purpose is produced.
Zur Herstellung der Krümmer aus Kunststoff ist es notwendig, dünnes, gegebenenfalls vorübergehend plastisch gemachtes formbares Kunststoffbandmaterial, von beispielsweise 1 bis 2 mm Stärke und 50 mm Breite, auf einen Dorn zu wickeln und dabei gleichzeitig die entstehende Wendelnaht zu verschweißen, zu verschmelzen oder zu verkleben. Das so gefertigte Rohr kann danach zur Erhöhung seines Widerstandsmomentes in einer Maschine, die wie eine Drehbank oder eine Einrichtung zur Verpackung von runden Gegenständen arbeitet, mit einer oder mehreren Lagen von Bandmaterial aus besonders zähem, gewelltem oder gebuckeltem Papier, Fiber, Preßspan, Furnierholz, Geweben aus natürlichen oder künstlichen Stoffen (wie Jute, Glasfaser, Asbest, Formstoffen oder Metall) oder mit durchlochtem und gewelltem Blech umwickelt werden, wobei während des Umwickelns Kunststoff zwischen die einzelnen Lagen gespritzt, gegossen oder durch Vakuumtränkung eingebracht wird, der dabei den Grundstoff des Rohres mit den danach aufgebrachten Lagen des Verstärkungsstoffes und diese miteinander verklebt. Auf diese Füllstoffschicht kann noch eine gegenläufige Wendel aus formbarem Kunststoff in Bandform von etwa 1 bis 2 mm Stärke und etwa 50 mm Breite zur Glättung aufgebracht und mit der Füllschicht beispielsweise durch Verkleben verbunden werden. To make the elbow out of plastic it is necessary to use thin, malleable plastic strip material that has been temporarily plasticized, if applicable, for example 1 to 2 mm thick and 50 mm wide, to be wound on a mandrel and at the same time welding and fusing the resulting spiral seam or to glue. The pipe produced in this way can then be used to increase its section modulus in a machine that works like a lathe or a packaging facility round objects works with one or more layers of tape material particularly tough, curled or hunched paper, fiber, pressboard, plywood, Fabrics made from natural or artificial materials (such as jute, fiberglass, asbestos, molded materials or metal) or be wrapped with perforated and corrugated sheet metal, while during of wrapping plastic is injected, poured or molded between the individual layers is introduced by vacuum impregnation, which is the base material of the pipe with the then applied layers of reinforcing material and these are glued together. A counter-rotating helix made of malleable plastic can also be placed on this filler layer Applied in tape form of about 1 to 2 mm thickness and about 50 mm width for smoothing and connected to the filling layer, for example by gluing.
Unter Herabsetzung der erforderlichen Menge an hochwertigem Kunststoff kann das Widerstandsmoment trotzdem erhöht werden, indem auf die Rohre Rippen (quadratisch oder rund geschnittene Platten aus Formstoff, Metall, Beton oder Asbestzement mit einer Bohrung vom Außendurchmesser des Rohres) gesetzt werden. Diese können im Abstand je nach Außenbelastung des Rohres enger oder weiter auf dem Rohr durch Kleben oder Schweißen angebracht werden. Rippen und Gewinde ermöglichen, daß das Rohr nur in einer bestimmten Wandstärke hergestellt zu werden braucht (darauf können auch die Klebemuffen in ihrer Wandstärke abgestellt sein), während die zu erwartenden Kräfte durch Verkehrs- und Erdlast von den aufgesetzten Rippen aufgenommen werden. While reducing the required amount of high quality plastic the section modulus can still be increased by placing ribs on the tubes (square or round cut panels made of molded material, metal, concrete or asbestos cement a hole of the outer diameter of the pipe). These can be at a distance depending on the external load on the pipe, narrower or wider on the pipe by gluing or Welding to be attached. Ribs and threads allow the pipe to only go in a certain wall thickness needs to be produced (on it can even the adhesive sockets in their wall thickness should be turned off), while the expected Forces due to traffic and earth loads are absorbed by the attached ribs.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1962D0043858 DE1276907B (en) | 1962-09-12 | 1962-09-12 | Process for the production of curved tubes for large pneumatic tube systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1962D0043858 DE1276907B (en) | 1962-09-12 | 1962-09-12 | Process for the production of curved tubes for large pneumatic tube systems |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1276907B true DE1276907B (en) | 1968-09-05 |
Family
ID=7047904
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1962D0043858 Pending DE1276907B (en) | 1962-09-12 | 1962-09-12 | Process for the production of curved tubes for large pneumatic tube systems |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE1276907B (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2336540A (en) * | 1941-09-26 | 1943-12-14 | Sefton Fibre Can Company | Lined fiber tubing and process of making same |
FR1150700A (en) * | 1955-03-15 | 1958-01-16 | United Shoe Machinery Ab | Softwood Pipe Fittings |
FR1205255A (en) * | 1957-03-26 | 1960-02-02 | Vitagen Corp | Gas generating method and apparatus |
-
1962
- 1962-09-12 DE DE1962D0043858 patent/DE1276907B/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2336540A (en) * | 1941-09-26 | 1943-12-14 | Sefton Fibre Can Company | Lined fiber tubing and process of making same |
FR1150700A (en) * | 1955-03-15 | 1958-01-16 | United Shoe Machinery Ab | Softwood Pipe Fittings |
FR1205255A (en) * | 1957-03-26 | 1960-02-02 | Vitagen Corp | Gas generating method and apparatus |
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