DE730629C - Process for the production of curved pipe sections from hard paper or hard tissue - Google Patents
Process for the production of curved pipe sections from hard paper or hard tissueInfo
- Publication number
- DE730629C DE730629C DEM134947D DEM0134947D DE730629C DE 730629 C DE730629 C DE 730629C DE M134947 D DEM134947 D DE M134947D DE M0134947 D DEM0134947 D DE M0134947D DE 730629 C DE730629 C DE 730629C
- Authority
- DE
- Germany
- Prior art keywords
- hard
- production
- paper
- pipe sections
- curved pipe
- 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
- 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
- B29C53/02—Bending or folding
- B29C53/08—Bending or folding of tubes or other profiled members
- B29C53/083—Bending or folding of tubes or other profiled members bending longitudinally, i.e. modifying the curvature of the tube axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
- B29B13/023—Half-products, e.g. films, plates
- B29B13/024—Hollow bodies, e.g. tubes or profiles
-
- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
- B31F1/0003—Shaping by bending, folding, twisting, straightening, flattening or rim-rolling; Shaping by bending, folding or rim-rolling combined with joining; Apparatus therefor
- B31F1/0006—Bending or folding; Folding edges combined with joining; Reinforcing edges during the folding thereof
- B31F1/0032—Bending or folding; Folding edges combined with joining; Reinforcing edges during the folding thereof of tubes
-
- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
- B29C35/041—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using liquids
- B29C2035/042—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using liquids other than water
- B29C2035/043—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using liquids other than water oil
-
- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
- B29C35/041—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using liquids
-
- 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
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
-
- 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
- B29L2023/00—Tubular articles
- B29L2023/22—Tubes or pipes, i.e. rigid
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Description
Verfahren zum Herstellen von gekrümmten Rohrstücken aus Hartpapier oder Hartgewebe Geschichtete Kunstharzhartpapi;er- und -hartgeweberohre sind zylindrische, im WickeL-prozeß hergestellte Körper, zu deren Erzeugung besondere Maschinen dienen, auf welchen mit einem härtbaren Kunstharzaufstrich versehene Papier- oder Gewebebahnen unter Druck und Hitze aufgerollt werden, bis die Abmessungen die erforderliche Größe haben.Process for the production of curved pipe sections from hard paper or hard tissue layered synthetic resin hard paper; he and hard tissue tubes are cylindrical, Bodies produced in the WickeL process, which are produced using special machines, on which paper or fabric webs provided with a curable synthetic resin coating rolled up under pressure and heat until the dimensions are the required size to have.
Charakteristisch ist an ihnen, daß das Kunstharz durch einen anschließenden Backprozeß in den unschmelzbaren und gehärteten Zustand übergeführt wird, bevor die Rohre in den Handel gelangen. Die Überführung des Kunstharzes in diesen Endzustand bringt es mit sich, daß die aufgewickelten Papier-oder Hartgewebelagen fest miteinander verbunden sind. Den Eigenschaften des Kunstharzes entsprechend sind derartige Rohre in den praktisch bei ihrer Verwendung vorkommenden Temperaturen formfest und gelten nicht als wärmeformbar. Sie finden daher auch ausschließlich in gestreckter zylindrischer Form Anwendung.It is characteristic of them that the synthetic resin is followed by a Baking process is converted into the infusible and hardened state before the pipes go on sale. The transfer of the synthetic resin into this final state it means that the wound paper or hard fabric layers firmly together are connected. Such pipes are in accordance with the properties of the synthetic resin dimensionally stable in the temperatures practically occurring during their use and apply not as thermoformable. You will therefore find it exclusively in the elongated cylindrical Form application.
Die vorhandenen Güteeigenschaften in meckischer und elektrischer Hinsicht wie auch die Beständigkeit gegenüber chemischen Einflüssen haben wiederholt den Gedanken nahegelegt, auch gekrfunmte Rohre, Bogen oder S-förmige Stücke von gleichen Eigenschaften herzustellen. The existing quality properties in meckish and electrical Respect as well as the resistance to chemical influences have repeated suggested the idea, also curved tubes, bends or S-shaped pieces of the same properties.
Es ist wohl bekannt, daß ausgehärtete Kunstharzplatten noch in weitgehendem Maße eine Gestaltung in gekrümmte Formen zulassen. Dies geschieht durch eine Ziehpressung, d. h. also, in beheizten Preßformen wird das reine, nicht mit Füllstoffen versehene Harz auf Kosten der Wandstärke in eine andere, z. B. gebogene Form gebracht. Eine derartige Umgestaltung bei Rohnen, gegeben nenfalls auch in Preßformen, ist jedoch bisher nur für wärmeformbane Stoffe, wie Cellw losederivate u. dgl., möglich gewesen. Rohre aus Kunstharzschichtstoffen mußten also grundsätzlich ihre gestreckte Form beibehalten, sie wurden beispielsweise zu T- oder H-Schienen in Preßformen umgestaltet. Dies ergab jedoch nur eine Querschnittsänderung. It is well known that cured synthetic resin panels are still largely Dimensions allow design in curved shapes. This is done by drawing press, d. H. So, in heated molds, the pure, not provided with fillers Resin at the expense of the wall thickness in another, z. B. brought curved shape. One however, such redesign in the case of Rohnen, possibly also in compression molds, is So far only for thermoformable substances, such as Cellw losederivate and the like., Was possible. Tubes made of synthetic resin laminates basically had to have their elongated shape retained, they were redesigned, for example, to T or H rails in compression molds. However, this only resulted in a change in cross-section.
Die Fertigung von gekrümmten Rohren aus vollen Papierbreiten auf normalen Wickelmaschinen ist praktisch undurchführbar, so daß man sich zur Herstellung solcher Teile besonderer Hilfsmittel bedienen mußte. B!eispielsweise hat man Krümmer und Bogen aus dünnem lackiertem Papier- oder Leinenbändern hergestellt, welche im Wickelprozeß von Hand auf einen bereits gekrümmten Kern aufgebracllt wurden und zur Fertigstellung eine äußere Druckform benötigten, oder man hat ein auf Wickelmaschinen hergestelltes gerades Rohr, bei dem sich das Harz alTerdings in einem nicht ausgehärteten und damit das Rohr in einem wärmleformbanen Zustand befindet, in besonderen Einrichtungen unter Füllung des Hohlraumes des Rohres mit Kernstücken oder D rahtbündeln gebogen. The manufacture of curved tubes from full widths of paper normal winding machines is practically impractical, so that one can go to manufacture such parts had to use special aids. E.g. you have elbows and sheets made of thin lacquered paper or linen tape, which are im Winding process by hand on an already curved core and an external printing form needed to complete the process, or one has one on winding machines manufactured straight pipe in which the resin is, however, in a non-hardened and so that the pipe is in a heat-forming state, in special facilities filling the cavity of the tube with Core pieces or wire bundles bent.
Alle diese Verfahren sind nur begrenzt anwendbar, da das Kernstück sich entfernen lassen muß, und erfordern zudem kostspielige zusätzliche Einrichtungen für die Kernstücke und die äußeren Preßformen.All of these procedures have limited applicability because they are at the core must be removable, and also require expensive additional facilities for the core pieces and the outer molds.
Die Erfindung vermeidet zur H!erstellung gekrümmter Rohre mit praktisch beliebigem Verlauf der Krümmung die Anwendung derartiger Hilfswerkzeuge. Sie geht von der überraschenden Feststellung aus, daß ein im Handel als durchbakeiisiert geltender Hartpapier- oder lIartgeweblerohr bei genügender und schnell auftretender Anwendung von Wärme noch eine so weitgehende Formbarkeit hat, daß es möglich ist, ohne Zerstörung der Haftung der einzelnen Wickellagen des zylindrischen Ausgangsrohres entweder beliebige Querschnittsveränderun gen oder I(rümmungen ohne innere und äußere, die Eigenschaften des Rohres beeinflussende Faltenbil -dungen durchzuführen. Zu bevorzugen sind für das Verfahren Rohre, für die Kunstharze venvendet wurden, dile im ausgebackenen Zustand einen gewissen Prozentsatz an freien Kresole haben. The invention avoids producing curved pipes with practically any course of the curvature the use of such auxiliary tools. she goes from the surprising finding that one is bakeiized in the trade Applicable hard paper or lIartgeweblerrohr with sufficient and quickly occurring Application of heat is still so malleable that it is possible without destroying the adhesion of the individual winding layers of the cylindrical output tube either any cross-sectional changes or I (curvatures without inner and outer, to create folds that influence the properties of the pipe. to pipes for which synthetic resins have been used are preferred for the process, dile have a certain percentage of free cresols when baked.
Die Durehführung des Verfahrens erfolgt in der Weise, daß die zur Krümmung bestimmten Rohre in ein genügend heißles Flüssigkeitsbad (Mineralöl) gebracht werden. das auf den Werkstoff nicht zerstörend einwirkt. The process is carried out in such a way that the for Bending certain pipes in a sufficiently hot liquid bath (mineral oil) will. which does not have a destructive effect on the material.
Nach kürzerer Durchwärmung im Bade, wobei das Durchspülen des Rohres mit der Flüssigkeit eine gleichmäßige Durchdringung der Schichten mit Wärme fördert, ist es möglich, an derartig durchwärmten Rohren beliebige Biegungen vorzunehmen, ohne daß dabei der kreisförmige Querschnitt des Rohres merklich beeinträchtigt wird.After a short soak in the bath, with the rinsing of the tube with the liquid promotes an even penetration of the layers with heat, it is possible to make any bends on pipes heated in this way, without the circular cross-section of the tube being noticeably impaired.
Sind bei einer Biegung des Rohres bestimmte Krümmungsmaße vorgeschri eben, so ist es zweckmäßlig, die Biegung über den Dorn einer normalen Biegevorrichtung zu bewirken, welche dann unmittelbar in dem geheizten ölbad angebracht ist oder sichauß!erhalb des ölbades in genügender Greifnähe befindet, um ein Erkalten des Rohres zu verhindern. Es hat sich gezeigt, daß bereits Temperaturen von etwa 120 bis I40C ausreichend sind, um gemeinhill im Handel als gehärtet bezeichnete Hartpapierrohre allen möglichen Formänderungen zu unterziehea. Are certain curvatures required when the pipe is bent? just, it is advisable to use the mandrel of a normal bending device to make the bend to effect, which is then attached directly to the heated oil bath or outside of the oil bath is within reach enough to prevent the To prevent pipe. It has been shown that temperatures of about 120 up to I40C are sufficient to commonly known as hardened hard paper tubes to undergo all possible shape changes a.
Beim Abkühlen halten derartig verformte Rohre das ihnen aufgezwungene Krümmungsmaß bei. Zur Sicherung genauer Abmessungen, wie sie für bestimmte Zwecke verlangt werden, kann natürlich das Erkalten nach der Durchführung des Biegeprozesses in einer offenen einfachen Form stattfinden.When they cool down, such deformed pipes hold what was forced on them Curvature at. To ensure precise dimensions as required for specific purposes may of course be required to cool down after the bending process has been carried out take place in an open simple form.
In derartigen Rohren bleibt die feste Lagenverbindung der Schichten auch nach Durchführung der Krümmungen vollständig erha] -ten. Diese Tatsache ist durch Messungen der elektrischen und mechanischen Eigenschaften festgestellt worden. Es konnte bei spielsweise ermittelt werden, daß die elektrische Durchschlagsfestigkeit dieser gekrümmten Rohre gegenüber den gleichen, nicht dem Krümmungsprozeß unterworfenen Rohren nur I 0 °lo zurückgegangen ist. während sonst beim Lösen der Schichten durch eine unsachgemäße Verformung. der die Kunstharzbindung nicht folgen kann, die Durch schlagsfestigkeit durch das Auftreten von Luftschichten auf einen ganz geringen Wert absinkt. In such pipes the firm layer connection of the layers remains completely retained even after performing the curvatures. That fact is has been determined by measurements of the electrical and mechanical properties. It could be determined in example that the dielectric strength of these curved tubes compared to the same ones that are not subjected to the bending process Pipes only decreased I 0 ° lo. while otherwise when loosening the layers through improper deformation. which the resin bond cannot follow the through impact resistance due to the appearance of air layers to a very low level Value drops.
Derartige Feststellungen beweisen, daß die Bindung der Schichten bei dem angewandten Biegeverfahren vollständig erhalten geblieben ist. Beispielsweise sei erwähnt, daß ein Rohr von 8 mm Durchmesser und einer Wandstärke von 2 mm -sich zu einem vollständigen I(reis mit einem Radius von etwa 130 mm hat zusammenbiegen lassen, ohne daß der kreisrunde Querschnitt des Rohres merklich beeinträchtigt wurde oder die elektrische Güte gelitten hat. Such findings prove that the bonding of the layers has been completely retained in the bending process used. For example it should be mentioned that a tube of 8 mm diameter and a wall thickness of 2 mm -sich Bend into a complete I (rice with a radius of about 130 mm leave without the circular cross-section of the tube was noticeably impaired or the electrical quality has suffered.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEM134947D DE730629C (en) | 1936-06-27 | 1936-06-27 | Process for the production of curved pipe sections from hard paper or hard tissue |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEM134947D DE730629C (en) | 1936-06-27 | 1936-06-27 | Process for the production of curved pipe sections from hard paper or hard tissue |
Publications (1)
Publication Number | Publication Date |
---|---|
DE730629C true DE730629C (en) | 1943-01-14 |
Family
ID=7333176
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEM134947D Expired DE730629C (en) | 1936-06-27 | 1936-06-27 | Process for the production of curved pipe sections from hard paper or hard tissue |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE730629C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1237657B (en) * | 1957-03-30 | 1967-03-30 | Moser Glaser & Co A G | Process for the production of hollow bodies or casings for electrical insulation purposes |
-
1936
- 1936-06-27 DE DEM134947D patent/DE730629C/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1237657B (en) * | 1957-03-30 | 1967-03-30 | Moser Glaser & Co A G | Process for the production of hollow bodies or casings for electrical insulation purposes |
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