DE655014C - Method and device for the production of flexible tapes - Google Patents

Method and device for the production of flexible tapes

Info

Publication number
DE655014C
DE655014C DEN39739D DEN0039739D DE655014C DE 655014 C DE655014 C DE 655014C DE N39739 D DEN39739 D DE N39739D DE N0039739 D DEN0039739 D DE N0039739D DE 655014 C DE655014 C DE 655014C
Authority
DE
Germany
Prior art keywords
nozzle
tape
production
hose
places
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
Application number
DEN39739D
Other languages
German (de)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Norddeutsche Seekabelwerke GmbH
Original Assignee
Norddeutsche Seekabelwerke GmbH
Priority date (The priority date 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 date listed.)
Publication date
Priority to DEN39739D priority Critical patent/DE655014C/en
Application granted granted Critical
Publication of DE655014C publication Critical patent/DE655014C/en
Expired legal-status Critical Current

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
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
    • B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
    • B29C55/16—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial simultaneously
    • 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
    • B29C48/355—Conveyors for extruded 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
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
    • B29C55/08—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique transverse to the direction of feed
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/02—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D01F6/20—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polymers of cyclic compounds with one carbon-to-carbon double bond in the side chain
    • 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
    • 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
    • B29C48/05—Filamentary, e.g. strands
    • 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
    • B29C48/07—Flat, e.g. panels
    • 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
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Textile Engineering (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Organic Insulating Materials (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Artificial Filaments (AREA)
  • Insulating Bodies (AREA)

Description

Verfahren und Vorrichtung zur Herstellung biegsamer Bänder Zn dem Patent 654757 ist ein Verfahren und eine Vorrichtung zur Herstellung von biegsamen Bändern aus Polymerisationsprodukten von Arylolefinen, insbesondere Polystyrol, durch Ausspritzen der Masse aus einer ringförmigen Düse lind Ziehen über eine Spreizvorrichtung beschrieben. Die Erfindung hat die Verbesserung des Verfahrens und der Vorrichtung nach dem Hauptpatent zum Gegenstand.Method and device for the production of flexible strips Zn dem U.S. Patent 654757 is a method and apparatus for making pliable Ribbons made from polymerization products of aryl olefins, especially polystyrene, by spraying the mass from an annular nozzle and pulling it over a spreading device described. The invention has improvements in the method and apparatus according to the main patent on the subject.

Die Wandstärke des Schlauches oder die Dicke des Bandes hängt bei gegebener Größe des Preßdruckes, der Temperatur, des Reibungswiderstandes und des Querschnittes der Düse noch von dem Grad der Reckung ab. Ein Punkt des Schlauches, der über die Mitte der Spreizvorrichtung hinweggleitet, legt bei der beschriebenen Spreizvorrichtung während der Reckung einen kürzeren Weg zurück als ein Punkt an den Rändern des Bandes, und die Bänder werden daher infolge geringerer Reckung in der Mitte dicker als an den Rändern. Außerdem ist die aus der Düse austretende Kunstmasse selbst bei großer Durcharbeitung nicht an allen Stellen gleichmäßig plastisch, sondern an einigen Stellen weicher als an den übrigen; das Band wird infolge stärkerer Reckung an diesen Stellen dünner.The wall thickness of the hose or the thickness of the tape is attached given size of the pressing pressure, the temperature, the frictional resistance and the Cross section of the nozzle still depends on the degree of stretching. One point of the hose which slides over the center of the spreader, attaches to the described Spreader a shorter way back than a point during the stretching the edges of the tape, and the tapes are therefore due to less stretching in the middle thicker than the edges. In addition, the synthetic material emerging from the nozzle is Even with a lot of work, not evenly three-dimensional in all places, but rather softer in some places than in the rest; the tape becomes larger as a result of greater stretching thinner in these places.

Um Bänder von gleichmäßiger Stärke und Biegsamkeit zu erhalten, werden in weiterer Ausbildung der Erfindung gemäß Patent 654757 de Bänder nach Verlassen der ringförmigen Düse stellenweise abgekühlt. Die Abkühlung erfolgt vorteilhaft durch einen Luft- oder anderen Gasstrom, der durch regelbare Düsen in. entsprechender Stärke auf das Band geblasen wird. Die Düsen oder wenigstens einige derselben sind vorteilhaft verschiebbar angeordnet, so daß sie während des Betriebes auf die Stellen, die eine Kühlung erfordern, berichtet werdefi können. Die regelbaren Düsen können jedoch auch in großer Anzahl rings um das zu rechende Band fest angeordnet und die Stärke des durch jede Düse austretenden Gasstromes so eingestellt werden, daß :ein Band von lyleichinäßiger Stärke und Biegsamkeit erbalten wird.In order to obtain strips of uniform strength and flexibility, in a further embodiment of the invention according to patent 654757 de strips are cooled in places after leaving the annular nozzle. The cooling is advantageously carried out by means of a stream of air or other gas which is blown onto the strip at an appropriate strength through controllable nozzles. The nozzles, or at least some of them, are advantageously arranged to be slidable so that they can be reported to the locations requiring cooling during operation. The controllable nozzles can, however, also be arranged in large numbers around the band to be calculated and the strength of the gas flow exiting through each nozzle can be adjusted in such a way that: a band of lye-like strength and flexibility is obtained.

Ein Ausführungsbeispiel einer Vorrichtung nach der Erfindung ist in der Zeichnung in der Ansicht und im Schnitt dargestellt (Abb. i und z). Das aus der ringförmigen Düse a austretende Band b wird über die Spreizvorrichtung c gezogen. Die Ränder des Bandes «erden durch die feststehenden Düsend mit einem Luftstrom angeblasen, während die Düsene quer zum Band - über und unter demselben je eine - verschiebbar angeordnet sind. Die Stärke des Luftstromes wird durch die Ventile/ eingestellt.An embodiment of a device according to the invention is shown in FIG the drawing in the view and in section (Fig. i and z). The end The band b emerging from the annular nozzle a is pulled over the spreading device c. The edges of the tape are grounded through the fixed nozzles with an air stream blown on while the nozzle crosses the belt - one above and one below the same - Are slidably arranged. The strength of the air flow is determined by the valves / set.

Claims (1)

PATE iN'r:% N sYR1clii-s i. Verfahren zur Herstellung biegsamer Bänder aus Polymerisationsprodukten von Arylolefinen, insbesondere Polystyrol, nach Patent 654,757 durch Aussprztzexe der Masse aus einer Düse und Ziehen des entstehenden Schlauches oder Bandes über eine Spreizvorrichtung, dadurch gekennzeichnet, daß der Schlauch oder das Band nach Verlassen der Düse stellenweise durch einen Luft- oder Gasstrom abgekühlt werden. Vorrichtung zur Durchführung des Verfahrens nach Anspruch i, gekennzeichnet durch die Anordnung einer Anzahl regelbarer Düsen in der Nähe des zu reckenden Bandes zwischen Spritzdüse und Spritzvorrichtung .PATE iN'r:% N sYR1clii-s i. Process for making flexible belts from polymerization products of aryl olefins, in particular polystyrene, according to patent 654,757 by Aussprztzexe the mass from a nozzle and pulling the resulting Hose or tape over a spreading device, characterized in that After leaving the nozzle, the hose or the belt is replaced in places by an air or gas flow are cooled. Device for performing the method according to Claim i, characterized by the arrangement of a number of controllable nozzles in the proximity of the tape to be stretched between the spray nozzle and spray device.
DEN39739D 1932-10-24 Method and device for the production of flexible tapes Expired DE655014C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEN39739D DE655014C (en) 1932-10-24 Method and device for the production of flexible tapes

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEN39739D DE655014C (en) 1932-10-24 Method and device for the production of flexible tapes
DEN34343D DE653250C (en) 1932-10-24 1932-10-24 Manufacture of flexible straps or threads made of polystyrene or the like.

Publications (1)

Publication Number Publication Date
DE655014C true DE655014C (en) 1938-01-13

Family

ID=6449037

Family Applications (4)

Application Number Title Priority Date Filing Date
DEN39739D Expired DE655014C (en) 1932-10-24 Method and device for the production of flexible tapes
DEN34343D Expired DE653250C (en) 1932-10-24 1932-10-24 Manufacture of flexible straps or threads made of polystyrene or the like.
DEN35516D Expired DE654299C (en) 1932-10-24 1933-07-21 Production of flexible strips or foils made of polystyrene o.
DEN36008D Expired DE654757C (en) 1932-10-24 1933-11-26 Manufacture of flexible tapes, foils or tubes made of polystyrene or the like.

Family Applications After (3)

Application Number Title Priority Date Filing Date
DEN34343D Expired DE653250C (en) 1932-10-24 1932-10-24 Manufacture of flexible straps or threads made of polystyrene or the like.
DEN35516D Expired DE654299C (en) 1932-10-24 1933-07-21 Production of flexible strips or foils made of polystyrene o.
DEN36008D Expired DE654757C (en) 1932-10-24 1933-11-26 Manufacture of flexible tapes, foils or tubes made of polystyrene or the like.

Country Status (4)

Country Link
DE (4) DE653250C (en)
FR (3) FR762838A (en)
GB (2) GB419900A (en)
NL (1) NL37479C (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2718658A (en) * 1952-12-22 1955-09-27 Dow Chemical Co Film stretching device
DE968346C (en) * 1952-06-26 1958-02-06 Huckfeldt & Thorlichen Process for the production of curved synthetic fibers
DE1056817B (en) * 1953-12-09 1959-05-06 Horst Heidrich Device for the production of tubular films or the like from thermoplastic materials
DE1090503B (en) * 1955-10-28 1960-10-06 Windmoeller & Hoelscher Device for producing flat and gusseted bags from paper provided with a thermoplastic coating or the like.
DE1100937B (en) * 1955-09-09 1961-03-02 Mannesmann Ag Process for increasing the strength of pipes made of polyethylene which are subjected to internal pressure
DE974729C (en) * 1943-08-17 1961-05-31 Plax Ges Mit Beschraenkter Haf Method and device for the continuous production of biaxially oriented films from solvent-free organic polymerization products, in particular polystyrene
DE975383C (en) * 1941-12-22 1961-11-16 Plax G M B H Deutsche Device for the production of foils from solvent-free, organic, thermoplastic plastics
DE1128635B (en) * 1954-08-17 1962-04-26 Hercules Powder Co Ltd Process for the production of an unsupported, molecularly oriented film from a polymer of 3,3-bis- (chloromethyl) -oxacyclobutane

Families Citing this family (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE748562C (en) * 1935-04-13 1944-11-06 Ig Farbenindustrie Ag Process for the production of artificially shaped structures from polystyrene
DE943257C (en) * 1936-04-29 1956-05-17 Ici Ltd Process for the production of films, coverings, strips, tapes and the like. like
DE758240C (en) * 1938-06-17 1953-08-10 Siemens & Halske A G Process for the production of electrical wound capacitors with a dielectric made of polymer material
DE767619C (en) * 1938-12-23 1952-11-24 Ig Farbenindustrie Ag Sieve mesh or mesh
DE856689C (en) * 1940-06-24 1952-11-24 Gerhard Aschenbrenner Process for the production of artificial threads
DE970339C (en) * 1940-09-14 1958-09-11 Stahl Und Walzwerke Rasselstei Process for the production of foil-coated metal strips or sheets for the production of cans or similar containers
CA427868A (en) * 1941-04-23 1945-05-29 Stanley Jesionowski Raymond Plastic extrusion method and apparatus
DE750841C (en) * 1941-06-25 1945-01-30 Process for the production of panels from filler-containing polyisobutylene
DE908661C (en) * 1941-08-28 1954-04-08 Roehm & Haas G M B H Process for the production of wool-like, artificial threads from polymerisation products
US2544258A (en) * 1945-03-03 1951-03-06 Technicolor Motion Picture Method and means for forming film
LU28856A1 (en) * 1945-03-28 1900-01-01
US2529897A (en) * 1948-01-17 1950-11-14 Plax Corp Process of and apparatus for manufacturing thin wall tubing
BE488617A (en) * 1948-07-14 1900-01-01 Plax Corp
BE488618A (en) * 1948-10-27 1900-01-01
DE887262C (en) * 1951-05-03 1953-08-20 Langheck & Co Process for drying films made from regenerated cellulose
BE500098A (en) * 1951-05-22 1900-01-01
US2720680A (en) * 1952-02-29 1955-10-18 Milo R Gerow Methods and machines for producing tubing and sheeting
US2823421A (en) * 1952-05-12 1958-02-18 Du Pont Stretching of polyethylene terephthalate film
BE522077A (en) * 1952-08-12
US2697248A (en) * 1952-12-22 1954-12-21 Dow Chemical Co Film stretching device
US2695420A (en) * 1952-12-22 1954-11-30 Dow Chemical Co Film stretching device
DE1125144B (en) * 1955-10-29 1962-03-08 Hoechst Ag Process for solidifying plastic pipes
DE1194561B (en) * 1956-05-18 1965-06-10 Ici Ltd Process for the production of a biaxially oriented polyethylene terephthalate film with high strength in the longitudinal direction
DE1140700B (en) * 1956-06-14 1962-12-06 Horst Heidrich Device for the production of profile tubes from thermoplastics
US3009200A (en) * 1956-07-31 1961-11-21 Lonza Electric & Chem Works Extrusion arrangement for producing foils
FR1188651A (en) * 1956-12-20 1959-09-24 Du Pont Linear polyterephthalate film and its manufacturing process
US3052924A (en) * 1959-09-28 1962-09-11 Monsanto Chemicals Process for the manufacture of biaxially oriented crystalline polystyrene
BE595343A (en) * 1960-09-26 1900-01-01
DE1184067B (en) * 1960-10-04 1964-12-23 Roehm & Haas Gmbh Production of pliers-like devices from thermoplastic material
US3217361A (en) * 1963-01-30 1965-11-16 Fmc Corp Stretching mechanism for blown films
IL22357A (en) * 1963-11-22 1968-04-25 Petzetakis Aristovoulos George Calibration of tubes
GB1249835A (en) * 1968-11-30 1971-10-13 Mitsubishi Petrochemical Co Method and apparatus for stretching film of thermoplastic synthetic plastics material
GB8827967D0 (en) * 1988-11-30 1989-01-05 Ward I M Die-free drawing

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE975383C (en) * 1941-12-22 1961-11-16 Plax G M B H Deutsche Device for the production of foils from solvent-free, organic, thermoplastic plastics
DE974729C (en) * 1943-08-17 1961-05-31 Plax Ges Mit Beschraenkter Haf Method and device for the continuous production of biaxially oriented films from solvent-free organic polymerization products, in particular polystyrene
DE968346C (en) * 1952-06-26 1958-02-06 Huckfeldt & Thorlichen Process for the production of curved synthetic fibers
US2718658A (en) * 1952-12-22 1955-09-27 Dow Chemical Co Film stretching device
DE1056817B (en) * 1953-12-09 1959-05-06 Horst Heidrich Device for the production of tubular films or the like from thermoplastic materials
DE1128635B (en) * 1954-08-17 1962-04-26 Hercules Powder Co Ltd Process for the production of an unsupported, molecularly oriented film from a polymer of 3,3-bis- (chloromethyl) -oxacyclobutane
DE1100937B (en) * 1955-09-09 1961-03-02 Mannesmann Ag Process for increasing the strength of pipes made of polyethylene which are subjected to internal pressure
DE1090503B (en) * 1955-10-28 1960-10-06 Windmoeller & Hoelscher Device for producing flat and gusseted bags from paper provided with a thermoplastic coating or the like.

Also Published As

Publication number Publication date
DE654299C (en) 1937-12-18
DE654757C (en) 1938-01-13
FR762838A (en) 1934-04-19
FR45266E (en) 1935-07-22
NL37479C (en) 1900-01-01
DE653250C (en) 1937-11-18
GB419900A (en) 1934-11-21
GB431619A (en) 1935-07-11
FR45798E (en) 1935-12-02

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