US3753298A - Web dryer - Google Patents
Web dryer Download PDFInfo
- Publication number
- US3753298A US3753298A US00209204A US3753298DA US3753298A US 3753298 A US3753298 A US 3753298A US 00209204 A US00209204 A US 00209204A US 3753298D A US3753298D A US 3753298DA US 3753298 A US3753298 A US 3753298A
- Authority
- US
- United States
- Prior art keywords
- web
- drums
- belt
- dryer
- belts
- 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 - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
- F26B13/06—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement with movement in a sinuous or zig-zag path
- F26B13/08—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement with movement in a sinuous or zig-zag path using rollers
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
Definitions
- ABSTRACT A web dryer structure for thermal removal of moisture from a traveling web such as a web of paper coming from the press section of a paper making machine including a row of upper dryer drums and a row of lower dryer drums with the drums positioned to carry the web in a sinuous path successively between the upper and lower drums and the web wrapping the upper and lower surfaces of the drums respectively with upper and lower looped felts wrapping the web on the upper and lower surfaces of the drums with the felt guided by guide rolls which are shifted laterally of the spaces between the drums a distance in the direction of web movement so that the pockets formed between the felts and the drums are pressurized due to the induced flow of air by the traveling felts and the guide rolls pumping air through the felts.
- the invention relates to improvements in dryer drum structures for drying a traveling web and more particularly to a structure which is used for thermally drying a web suchas a continuous run of paper which is received at high speed from the press section of a paper making machine.
- the invention relates to the particular arrangement and guidance of the felts for supporting theweb on the drum so that the web is supported at all locations of its travel and air pressure is induced in the pockets between the web and the drum so that the paper machine can operate at very high speeds without flutter of the Web.
- the moisture bearing web is received from the press section of the machine and is directed along a serpentine path in wrapped relation with a plurality of steam heated dryer drums.
- These drums are usually arranged in upper and lower rows with the drums staggered so that the paper web can pass back and forth and wrap the upper and lower drums with the moisture evaporating from the web as it is heated while in contact with the drum.
- upper and lower looped felts are provided which wrap over the outer surface of the web while on the drum surface. Arrangements have been made for guiding the felts in their travel between the drums and efforts have been made to utilize such guides to increase the drying action on the felts.
- lt isaccordingly a feature of the present invention to eliminate the disadvantages of structures heretofore available by providing an arrangement wherein the web is in contact with or in close running relation to the supporting felt at all locations. of its travel between upper and lower tiers of dryer drums.
- Another feature of the invention is to provide felt support rolls in a positioned arrangement so that an induced buildup of air in the pockets between the felts and supporting rollers is avoided.
- a still further object of the invention is to provide an improved structure for a dryer section of a paper making machine utilizing upper and lower dryer drums which permits the possibility of reconstruction of existing dryer sections without extensive relocation of parts and without relocating the dryer drums and with a minimum of reconstruction.
- a traveling web W is received from the left end of the drawing traveling to the right and the web may be a traveling paper web received from the last press section of a paper making machine.
- the web is carried by looped belts 20 and 21, which are of cotton, plastic or other material sufficiently porous to permit the escape of steam and the flow of air therethrough and which will be referred to hereinafter as felts.
- the web is received on a traveling lower felt 21.
- a similar upper felt 20 is led onto the lower felt with the web therebetween.
- the lower felt is trained over a guide roller 23 and the upper felt over a guide roller 35.
- the web is led by the felts through the dryer drums which are arranged in an upper row formed by the drums 12, 13, 14 and 15 and a lower row 16, 17 and 18 with the dryer drum being of the conventional steam heated type and being laterally offset from each other.
- the upper felt wraps the web over the upper surfaces of the upper drums and the lower felt wraps the web over the lower surfaces of the lower drums.
- the upper felt 20 is guided between the upper rolls by a series of felt guide rolls 26, 27 and 28. Similarly.
- the lower felt 21 is guided between the lower dryer drums by a series of guide rolls 24 and 25.
- the looped felts have adequate guiding and tensioning rolls which are omitted from the drawing for the sake of clarity.
- the felts also may be provided with felt cleaners and felt dryers.
- the guide rolls 26, 27 and 28 are positioned between respective pairs of lower dryer drums.
- the felt guide rolls 24 and 25 are positioned between respective pairs of upper dryer drums.
- the felt guide rolls are also arranged so that the guide rolls for the lower felts are positioned higher than the guide rolls for the upper felts.
- the first guide roll 26 is positioned below the second upper drum 13.
- the first guide roll 24 is positioned above the second dryer drum 17.
- the web W travels over the first upper dryer drum 12 supported on the lower felt 21 and is guided to wrap the first lower dryer drum 16.
- a heated dryer means 34 is positioned outside of the belt above the upper drum 12.
- the web then travels upwardly in a run 21a of the lower felt to where it is transferred to the upper felt 20 at the location of the felt guide roll 26. Air moving with the web W on the felt run portion 21a is forced into the triangular space indicated at A and builds up between the felt and web as they wrap the felt roll 26.
- the geometrical relationship between the felt and felt roll 26 indicated at B combined with the direction of travel and rotation of the felt and roll 26, respectively, is such that a subatmospheric condition will be created at B which will draw the air trapped between the felt and web through the felt into the space E thus avoiding any tendency of the web to flutter in its travel along the span indicated at 20a.
- air moving with the web W on the felt run portion 20b is forced into the triangular space C and builds up between the felt and web as they wrap the felt roll 24.
- the subatmospheric condition created at D will draw the air trapped between the felt and web through the felt into the space D thus avoiding web flutter. This process is repeated at felt rolls 27, 25 and 28 thus providing for a stable and controlled web run through the dryer section.
- air flowing with the lower surface of the lower felt in its run 21a will induce an upward flow of air to pressurize the space 36 thereby causing a flow of air through the felt into the pocket 30 as indicated by the arrows.
- This flow of air aids in the transfer of the web from the lower felt run 21a to the upper felt 20a at the guide roll 26 so that the web will travel upwardly following the upper felt in its run 200.
- the pressure in the pocket 30 will support the web on the felt run 20a and the flow of air thorugh the felt in the upper portion of the felt run 21a tends to dry the felts.
- Moisture laden air is removed from the pockets 30, 31, 32 and 33 at the front and rear end portions thereof. The airflow pattern through the felt into the pockets is repeated at 32, 31 and 33 and through successive pockets not shown.
- the felt rolls 26, 27, 28, 24 and 25, as shown at 25, may be in the form of suction felt rolls comprising a perforate shell and an interior suction gland positionable for optimum air removal.
- air carried on the web span 21a is forced into the triangular space defined by the web run portion 21a and roll 26.
- a vacuum is cre ated which sucks the air through the felt from the underside of the web. No air bubbles are formed around the roll 26 and the web remains in a stable condition.
- the guide rolls are so positioned so that the induced flow of air not only aids in transferring of the web, but aids in drying of the felts. At high speeds, this induced flow of air is significant, and the conduits at the ends of the pockets can control the flow of air so that the pockets are slightly pressurized to aid in supporting the web on the felt after it has been transferred or they may induce an increased flow of air through the felt.
- a web dryer for the thermal removal of moisture from a traveling web comprising in combination,
- a plurality of rotatably mounted lower dryer drums adapted to be heated to carry the web and evaporate moisture thereform, said drums positioned to carry the web in a sinuous path passing successively between the upper and lower drums with the web wrapping their upper and lower surfaces respectively, upper and lower looped belts formed of a pervious material accommodating the escape of water vapor from the web and wrapping the web on the upper and lower surfaces of the upper and lower drums respectively, upper and lower belt guide rolls for the upper and lower belts respectively with one guide roll between each pair of adjacent drums for the upper drums and for the lower drums, said lower belt guide rolls positioned to carry the portion of the lower belt between adjacent lower drums into the spaces between said lower drums,
- said upper belt guide rolls positioned to carry the portions of the upper belt between adjacent upper drums into the spaces between said upper drums and said guide rolls positioned laterally of said spaces in the direction of web travel and located to carry each of the belts to receive the web directly from the other belt as the web travels between the upper and lower dryer drums so that the web is supported for its travel between the lower and upper drums and so that the web wraps a greater surface area of the drum on the onrunning side than on the offrunning side and air layers building up between the web and the guide rolls are dissipated on the offrunning side of the guide rolls.
- a web dryer structure for the thermal removal of moisture from a traveling web constructed in accordance with claim 1 wherein a flow of air is induced through the belts into the pockets between the lower belt and the upper drums and between the upper belt and the'lower drums for aiding in transfer of the web and drying of the belts 3.
- a web dryer structure for the thermal removal of moisture from a traveling web constructed in accordance with claim 2 wherein the air flows axially outwardly from the ends of said pockets.
- a web dryer structure for the thermal removal of moisture from a traveling web constructed in accordance with claim 1 and including a lead guide for the upper belt directing it in a path onto the first upper drum with the lower belt then passing down over the first lower drum.
- a web processing device for contioning a traveling web constructed in accordance with claim 1 wherein the guide rolls comprise a perforate shell and'a suction gland in said shell.
- a web dryer structure for the thermal removal of moisture from a traveling web comprising in combination:
- a plurality of rotatably mounted lower dryer drums adapted to be heated to carry the web and evaporate moisture therefrom, said drums positioned to carry the web in a sinuous path passing successively between the upper and lower drums with the web wrapping their upper and lower surfaces respectively,
- upper and lower looped belts formed of a pervious material accommodating the escape of water vapor from the web and wrapping the web on the upper and lower surfaces of the upper and lower drums respectively,
- said guide rolls positioned so that the upper and lower belts wrap a greater arc of the upper and lower drums respectively on the onrunning side than on the offrunning side.
- a web dryer structure for the thermal removal of moisture from a traveling web constructed in accordance with claim 7 wherein a flow of air is induced in the open spaces between the lower felt and upper drums and upper felt and lower drums.
- a web dryer structure for the thermal removal of moisture from a traveling web constructed in accordance with claim 7 and including a heated dryer means positioned outside of the belt on the first upper dryer drum.
- a web processing device for conditioning a traveling web comprising in combination,
- an upper drum adapted to carry a web
- a lower drum adapted to carry a web
- upper and lower belt guide rolls for the upper and lower belts respectively, with one guide roll between each pair of adjacent drums for the upper drums and for the lower drums,
- said guide rolls positioned to guide the portions of the upper and lower belts between adjacent pairs of drums toward each other into close running relationship between the drums so that the web is controlled for its entire travel between the upper and lower drums,
- said belts defining runs for the web between upper and lower drums with one belt defining one portion of the run and the other belt defining another portion of the run with said portions being at an angle to each other,
- said guide rolls positioned so that as the web is carried in the first portion of its run it is turned into the second portion of its run at an angle in the direction of the supporting belt so that an air layer carried on the belt tends to be removed by the pumping action of the offrunning side of the guide roll.
- a web processing device for conditioning a traveling web constructed in accordance with claim 10 wherein the guide rolls are positioned so that the web wraps a greater angle of the drum on the onrunning side than on the offrunning side.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Paper (AREA)
- Drying Of Solid Materials (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US20920471A | 1971-12-17 | 1971-12-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3753298A true US3753298A (en) | 1973-08-21 |
Family
ID=22777798
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00209204A Expired - Lifetime US3753298A (en) | 1971-12-17 | 1971-12-17 | Web dryer |
Country Status (6)
Country | Link |
---|---|
US (1) | US3753298A (it) |
JP (1) | JPS5211784B2 (it) |
CA (1) | CA961636A (it) |
ES (1) | ES409732A1 (it) |
GB (1) | GB1411772A (it) |
IT (1) | IT972483B (it) |
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4000035A (en) * | 1973-05-10 | 1976-12-28 | J. M. Voith Gmbh | Machine for drying webs, including suction and heat-contact cylinders |
US4251928A (en) * | 1978-05-30 | 1981-02-24 | Asten Group Inc. | Metal impregnated dryer fabric |
DE3146936A1 (de) * | 1980-12-01 | 1982-06-24 | Valmet Oy, 00130 Helsinki | Verfahren in einem papiermaschinen-reihentrockner oder dergleichen |
EP0071639A1 (en) * | 1981-02-17 | 1983-02-16 | Weyerhaeuser Company | High speed paper drying |
US4485567A (en) * | 1982-09-29 | 1984-12-04 | Beloit Corporation | Dryer felt run |
DE3508964A1 (de) * | 1984-03-22 | 1985-09-26 | Valmet Oy, Helsinki | Verfahren und vorrichtung zur unterstuetzung der bahn in schnellaufenden papiermaschinen |
WO1987006635A1 (en) * | 1986-04-21 | 1987-11-05 | Beloit Corporation | Dryer felt run |
WO1988008898A1 (en) * | 1985-11-14 | 1988-11-17 | Valmet Paper Machinery Inc. | Method of and device for pocket ventilation in the drying section of a paper machine, in particular for high-speed paper machines |
DE3818600A1 (de) * | 1987-06-17 | 1988-12-29 | Valmet Paper Machinery Inc | Verfahren und vorrichtung in einem papiermaschinen-zylindertrockner, in dem zweisiebfuehrung angewendet wird |
US4815220A (en) * | 1986-07-18 | 1989-03-28 | Beloit Corporation | Web transfer apparatus |
DE4009287A1 (de) * | 1989-03-29 | 1990-10-04 | Valmet Paper Machinery Inc | Taschenbelueftungsverfahren und -vorrichtung |
US4972608A (en) * | 1989-02-17 | 1990-11-27 | Valmet Paper Machinery Inc. | Multi-cylinder dryer for a paper machine with supported draw of web |
DE4018882A1 (de) * | 1990-06-13 | 1991-12-19 | Voith Gmbh J M | Trockenpartie fuer eine papiermaschine |
WO1994019535A1 (en) * | 1993-02-19 | 1994-09-01 | Valmet Paper Machinery Inc. | Method and device for ensuring the run of the web in the multi-cylinder dryer of a papermachine |
US5475934A (en) * | 1993-02-19 | 1995-12-19 | Valmet Paper Machinery, Inc. | Method and device for ensuring the run of the web in the multi-cylinder dryer of a papermachine |
EP0726353A2 (en) | 1995-02-01 | 1996-08-14 | Valmet Corporation | Method for producing surface-treated paper and dry end of a paper machine |
US5586397A (en) * | 1993-11-30 | 1996-12-24 | Valmet Corporation | Dryer sections of a paper machine |
US5661911A (en) * | 1994-02-17 | 1997-09-02 | Valmet Corporation | Dryer section of a paper machine |
US5720109A (en) * | 1994-02-17 | 1998-02-24 | Valmet Corporation | Method for drying a paper web |
US5792318A (en) * | 1996-11-18 | 1998-08-11 | Mancini; Ralph | Method to stabilize sheet between press section and dryer section of a paper-making machine |
US6126787A (en) * | 1995-02-01 | 2000-10-03 | Valmet Corporation | Dry end of a paper machine |
WO2000079047A1 (de) * | 1999-06-17 | 2000-12-28 | Asten Ag | Verfahren und vorrichtung zum verbesserten trocknen einer papierbahn |
US6260287B1 (en) * | 1997-08-08 | 2001-07-17 | Peter Walker | Wet web stability method and apparatus |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4510698A (en) * | 1982-09-29 | 1985-04-16 | Beloit Corporation | Dryer felt run |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3191312A (en) * | 1961-04-17 | 1965-06-29 | Svenska Flaektfabriken Ab | Method of uniformly moistening paper and like hygroscopic web material |
US3314162A (en) * | 1965-10-19 | 1967-04-18 | Huyck Corp | Papermaking apparatus |
US3316657A (en) * | 1965-10-23 | 1967-05-02 | Huyck Corp | Air deflector utilizing coanda effect |
US3325909A (en) * | 1966-01-27 | 1967-06-20 | Huyck Corp | Fabric for pumping fluids |
US3355816A (en) * | 1965-05-24 | 1967-12-05 | Beloit Corp | Drying cylinders with felt idlers positioned to prevent fluttering of the web being treated |
US3378936A (en) * | 1962-09-26 | 1968-04-23 | Abitibi Power & Paper Co | Drier section of papermaking machine |
-
1971
- 1971-12-17 US US00209204A patent/US3753298A/en not_active Expired - Lifetime
-
1972
- 1972-11-07 GB GB5138272A patent/GB1411772A/en not_active Expired
- 1972-12-16 JP JP47125820A patent/JPS5211784B2/ja not_active Expired
- 1972-12-16 ES ES409732A patent/ES409732A1/es not_active Expired
- 1972-12-18 IT IT33075/72A patent/IT972483B/it active
- 1972-12-18 CA CA159,269A patent/CA961636A/en not_active Expired
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3191312A (en) * | 1961-04-17 | 1965-06-29 | Svenska Flaektfabriken Ab | Method of uniformly moistening paper and like hygroscopic web material |
US3378936A (en) * | 1962-09-26 | 1968-04-23 | Abitibi Power & Paper Co | Drier section of papermaking machine |
US3355816A (en) * | 1965-05-24 | 1967-12-05 | Beloit Corp | Drying cylinders with felt idlers positioned to prevent fluttering of the web being treated |
US3314162A (en) * | 1965-10-19 | 1967-04-18 | Huyck Corp | Papermaking apparatus |
US3316657A (en) * | 1965-10-23 | 1967-05-02 | Huyck Corp | Air deflector utilizing coanda effect |
US3325909A (en) * | 1966-01-27 | 1967-06-20 | Huyck Corp | Fabric for pumping fluids |
Cited By (34)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4000035A (en) * | 1973-05-10 | 1976-12-28 | J. M. Voith Gmbh | Machine for drying webs, including suction and heat-contact cylinders |
US4251928A (en) * | 1978-05-30 | 1981-02-24 | Asten Group Inc. | Metal impregnated dryer fabric |
DE3146936A1 (de) * | 1980-12-01 | 1982-06-24 | Valmet Oy, 00130 Helsinki | Verfahren in einem papiermaschinen-reihentrockner oder dergleichen |
EP0071639A1 (en) * | 1981-02-17 | 1983-02-16 | Weyerhaeuser Company | High speed paper drying |
EP0071639A4 (en) * | 1981-02-17 | 1985-06-10 | Weyerhaeuser Co | HIGH SPEED PAPER DRYING. |
US4485567A (en) * | 1982-09-29 | 1984-12-04 | Beloit Corporation | Dryer felt run |
DE3508964A1 (de) * | 1984-03-22 | 1985-09-26 | Valmet Oy, Helsinki | Verfahren und vorrichtung zur unterstuetzung der bahn in schnellaufenden papiermaschinen |
WO1988008898A1 (en) * | 1985-11-14 | 1988-11-17 | Valmet Paper Machinery Inc. | Method of and device for pocket ventilation in the drying section of a paper machine, in particular for high-speed paper machines |
DE3790947C2 (de) * | 1985-11-14 | 1996-05-09 | Valmet Paper Machinery Inc | Verfahren und Vorrichtung für eine Taschenventilation in der Trockenpartie einer Papiermaschine, insbesondere für schnellaufende Papiermaschinen |
US4953297A (en) * | 1985-11-14 | 1990-09-04 | Valmet Paper Machinery Inc. | Method of and device for pocket ventilation in the drying section of a paper machine, in particular for high-speed paper machines |
WO1987006635A1 (en) * | 1986-04-21 | 1987-11-05 | Beloit Corporation | Dryer felt run |
US4815220A (en) * | 1986-07-18 | 1989-03-28 | Beloit Corporation | Web transfer apparatus |
DE3818600A1 (de) * | 1987-06-17 | 1988-12-29 | Valmet Paper Machinery Inc | Verfahren und vorrichtung in einem papiermaschinen-zylindertrockner, in dem zweisiebfuehrung angewendet wird |
US4972608A (en) * | 1989-02-17 | 1990-11-27 | Valmet Paper Machinery Inc. | Multi-cylinder dryer for a paper machine with supported draw of web |
DE4009287A1 (de) * | 1989-03-29 | 1990-10-04 | Valmet Paper Machinery Inc | Taschenbelueftungsverfahren und -vorrichtung |
DE4009287B4 (de) * | 1989-03-29 | 2005-02-24 | Metso Paper, Inc. | Verfahren und Vorrichtung zum Trocknen einer feuchten Papierbahn in einer Papiermaschinen-Trockenpartie |
DE4018882A1 (de) * | 1990-06-13 | 1991-12-19 | Voith Gmbh J M | Trockenpartie fuer eine papiermaschine |
US5475934A (en) * | 1993-02-19 | 1995-12-19 | Valmet Paper Machinery, Inc. | Method and device for ensuring the run of the web in the multi-cylinder dryer of a papermachine |
WO1994019535A1 (en) * | 1993-02-19 | 1994-09-01 | Valmet Paper Machinery Inc. | Method and device for ensuring the run of the web in the multi-cylinder dryer of a papermachine |
US5560123A (en) * | 1993-02-19 | 1996-10-01 | Valmet Paper Machinery Inc. | Method and device for ensuring the run of the web in the multi-cylinder dryer of a papermachine |
US5862613A (en) * | 1993-11-30 | 1999-01-26 | Valmet Corporation | Paper machine and methods for drying a paper web |
US5630285A (en) * | 1993-11-30 | 1997-05-20 | Valmet Corporation | Methods for drying a paper web |
US5775001A (en) * | 1993-11-30 | 1998-07-07 | Valmet Corporation | Dryer sections of a paper machine |
US5586397A (en) * | 1993-11-30 | 1996-12-24 | Valmet Corporation | Dryer sections of a paper machine |
US5661911A (en) * | 1994-02-17 | 1997-09-02 | Valmet Corporation | Dryer section of a paper machine |
US5720109A (en) * | 1994-02-17 | 1998-02-24 | Valmet Corporation | Method for drying a paper web |
US5756156A (en) * | 1995-02-01 | 1998-05-26 | Valmet Corporation | Method for producing surface-treated paper and dry end of a paper machine |
EP0726353A2 (en) | 1995-02-01 | 1996-08-14 | Valmet Corporation | Method for producing surface-treated paper and dry end of a paper machine |
US6193840B1 (en) | 1995-02-01 | 2001-02-27 | Valmet Corporation | Method for producing surface-treated paper |
EP0916763A2 (en) | 1995-02-01 | 1999-05-19 | Valmet Corporation | Method for producing surface-treated paper and dry end of a paper machine |
US6126787A (en) * | 1995-02-01 | 2000-10-03 | Valmet Corporation | Dry end of a paper machine |
US5792318A (en) * | 1996-11-18 | 1998-08-11 | Mancini; Ralph | Method to stabilize sheet between press section and dryer section of a paper-making machine |
US6260287B1 (en) * | 1997-08-08 | 2001-07-17 | Peter Walker | Wet web stability method and apparatus |
WO2000079047A1 (de) * | 1999-06-17 | 2000-12-28 | Asten Ag | Verfahren und vorrichtung zum verbesserten trocknen einer papierbahn |
Also Published As
Publication number | Publication date |
---|---|
JPS5211784B2 (it) | 1977-04-02 |
JPS4867838A (it) | 1973-09-17 |
CA961636A (en) | 1975-01-28 |
IT972483B (it) | 1974-05-20 |
ES409732A1 (es) | 1975-11-16 |
GB1411772A (en) | 1975-10-29 |
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