GB2136027A - Calendering sheet paper - Google Patents
Calendering sheet paper Download PDFInfo
- Publication number
- GB2136027A GB2136027A GB8305937A GB8305937A GB2136027A GB 2136027 A GB2136027 A GB 2136027A GB 8305937 A GB8305937 A GB 8305937A GB 8305937 A GB8305937 A GB 8305937A GB 2136027 A GB2136027 A GB 2136027A
- Authority
- GB
- United Kingdom
- Prior art keywords
- endless belt
- thermal fluid
- sheet paper
- main roller
- roller
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
- B41M7/0054—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using protective coatings or film forming compositions cured by thermal means, e.g. infrared radiation, heat
-
- 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
- D21F5/004—Drying webs by contact with heated surfaces or materials
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G9/00—Other accessories for paper-making machines
- D21G9/009—Apparatus for glaze-coating paper webs
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
- D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod
- D21H25/14—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod the body being a casting drum, a heated roll or a calender
Abstract
Sheet paper covered with synthetic resin is inserted between a metallic endless belt 14 and press roller 16. The metallic endless belt is wound around and heated by main roller 18 in which a thermal fluid such as steam of oil is circulated. The sheet paper heated by conductive heat of the thermal fluid is then cooled by the endless belt 14 which is cooled by cold water shower 28 and, finally, the sheet paper is peeled off from the endless belt. In this way, construction of calendering apparatus can be simplified and an improved heat control can be realized. Furthermore, the sheet paper covered with synthetic resin can uniformly be heated and, thereby, calendering effect can be enhanced. <IMAGE>
Description
SPECIFICATION
Apparatus for calendering sheet paper
The present invention relates to calendering apparatus for sheet paper on which synthetic resin is coated, or more precisely, to calendering apparatus by which heat-melting and cooling effects are enhanced by a combination of main roller in which thermal fluid is circulated and cooling water shower.
Printed surface of sheet paper is calendered for finishing it beautifully and in a good sense. For calendering, synthetic resin coating such as polyvinyl chloride on the surface of sheet paper is once heated and melted.Aftersuch heat-melting process, the surface is cooled rapidly to obtain tension and luster on the surface. Therefore, in orderto effect calender- ing sufficiently, quantity of heat which is rendered to ortaken out of synthetic resin during heat-melting process and cooling process should strictly be managed.
In the prior art, infrared heater is fixed as heat source in the main roller which melts synthetic resin coating in cooperation with press roller. But, the temperature of such infrared heater rises to excess of 100 C.
Accordingly, the heating temperature of such infrared heater should strictly be controlled in orderto adjust the surfacetemperature of main roller. If not, printing ink and synthetic resin coating will be deteriorated.
Rapid temperature control of such infrared heating means for calendering is difficult. Because, if an electric circuit of infrared heater in the main roller is cut off, the accumulated heat in the main roller will not be discharged instantaneously, but discharged gradually. Thereby, time delay oftemperature fall of main rollercauses defective product. Moreover, infrared heater can not be uniformlyfixed in the main roller.
Therefore, heat distribution on the surface of main roller can not be fixed and such irregular heat distribution causes defective product. Even ifthe thickness of main roller is added in order to equalize the heat distribution, heat response of main roller, in otherwords rapid temperature setting, becomes difficult. Furthermore, over 10 kw of electric power is needed for the infrared heater and, especially, large scale equipmentfor insulation of rotating main roller.
Consequently, expensive electric costs and running costs are compelled.
As forthe prior art cooling means, compressed air is flown against an object by blower. But, such blower generates noises and its dimension is very large. In conclusion, rapid heating and cooling cycle can not be achieved bythe priorartcalenderapparatus. Its heat distribution is not uniform. Its dimension with pre
heat room is very large.
Accordingly, it is a main object ofthe present
invention to obtain an improved apparatus for
calendering sheet paper.
It is other object of the present invention to obtain
calendering apparatus bywhich precise heat control
is possible and which has good heat efficiency.
It is another object ofthe present invention to obtain
calendering apparatus by which uniform heating and
rapid calendering are possible.
It is further object of the present invention to obtain simplified and small-sized calendering apparatus.
To achieve these objects, calendering apparatus according to the present invention comprises; a main roller which is rotated by drive means provided near a sheet inserting table and has a hollow portion in which thermal fluid is circulated in order two heat an endless belt by conductive heat of thermal fluid, means for feeding thermal fluid to the hollow portion of main roller, a metallic endless beltthe surface ofwhich is polished and which is wound between the main roller and a delivery roller near a sheet discharging table, a press rollerwhich is adjustably in contact with the main roller by way of the endless belt, a cooling room which is provided near the main roller and surrounds the endless belt and a cold water shower which pours cooling water to the inner surface of the endless belt in the cooling room for rapidly cooling the endless belt.
These andfurtherobjects ofthe present invention will be more clearly understood bythefollowing descriptions with reference to the attached drawings.
But, these are only examples ofthe invention and the present invention shall not be limited to those examples.
Fig. is a chart showing an outline of calendering process by an apparatus according to the present invention.
Fig. 2 is a side view illustrating an embodiment of calendering apparatus according to the present invention.
Fig. 3 is a view showing a main roller and thermal fluid feeding means.
First of all, described is an outline of calendering process byan apparatus according to the present invention with reference to the attached drawings.
In a process indicated by numeral 10, sheet paper covered by synthetic resin is inserted between an endless belt 14 and a press roller 16from sheet inserting table 12. The endless belt 14 is wound around a main roller 18 and is heated by thermal fluid feeding means. The endless belt 14 heats sheet paper covered with synthetic resin in cooperation with the press roller 16 in a process indicated by numeral 20.
Numeral 22 indicates a processing process by the press roller 16. Sheet paper heated at a temperature below 1 OO"C is then transferred to a cooling process 24 with and by the endless belt 14. In the cooling process 24, the endless belt 14 is cooled by water shower 28 when it passes through a cooling room 26 and such cooling effect is conducted to sheet paper. Then, sheet paper is peeled off from the endless belt 14 in a process 30 and, finally, piled on a sheet discharging table 34 in a process 32. Numerals 36 and 38 indicate,
respectively, heating and cooling processes by the endless belt 14which repeats these processescycli- cally.Numeral 40 indicates a heating process of
endless belt 14 bythe main roller 18 and numeral 42
indicates a cooling process of the belt 14 by the water
shower 28.
Next, calendering apparatus for sheet paper is
detailed hereinunderwith reference to Figs. 2 and 3.
Numeral 18 indicates the main rollerfor heating the
endless belt 14 and the roller 14 is provided nearthe
sheet inserting table 12 and is rotated by drive means
44 such as stepless varying-speed motor by way of a
chain 46. The main roller 18 is made of a thin chilled
cast iron. The surface of the roller 18 is plated with
hard cm rome and, moreover, mirror-polished. The
inside of main roller 18 is, as shown in Fig. 3, hollowed out in uniform thickness and thermal fluid is introduced to a hollow portion 48. Examples of thermal fluid are steam or heated oil. In the embodiment of Fig.
3, steam is adopted as thermal fluid. Steam generated by a boiler 50 which constitutes thermal fluid feeding means is led to the hollow portion 48 in the main roller 18 with the aid of pumping means 52 and, after heating the main roller 18, steam returnsto the boiler 50 for reuse. The advantages of adopting steam as thermal fluid are that, unless over-heated temperature of steam does not exceed 1 200C 1 300C. Accordingly, notwithstanding the rotation speed of main roller 18, temperature conducted to sheet paper and its synthetic resin cover is below 100 C. Therefore, printing ink or the synthetic resin cover will not be deteriorated and uniform calendering can be resulted.Furth more, by leading steam of good heat efficiency into the hollow portion 48 of main roller 18, all area of main roller 18 can uniformly be heated and eveness of heat distribution can be accomplished. In addition,the circumferential temperature of main roller 18 can quickly be moderated by varying steam pressure.
Moreover, the maximum steam pressure is sufficient about 5 kg/cm2 and ordinary heavy oil may well be used so as to reduce fuel cost.
Above description is also applicable to the case in which an oil such as mineral oil is used as thermal fluid. Atype of such oil is determined in consideration of its specific heat, thermal condictivity and duration
so asto heat the main roller 18 properly. By adjusting the surface temperature of main roller 18 in this way,
synthetic resin cover which was attached to the
surface of sheet paper beforehand is uniformly melted
and then adheres onto the surface of endless belt 14.
Press roller 16 is adjustably in contactwith the main
roller 18 byway of the endless belt 14. The roller 16 is a metal roller on which synthetic rubber is coated and is movably supported in the same direction of an axis of main roller 18. Numeral 54 indicates oil pressure generator for adjusting contact pressure of pressure roller 16to the main roller 18. By moving a handle 56 of pressure generator 54, pressure roller 16 comes uniformly in contact with the main roller 18, adjusting contact pressure. Numeral 58 indicates a delivery roller which is symmetrically provided in relation to the main roller 18 at the side of sheet discharging table 34. The endless belt 14 is wound between these main roller 18 and delivery roller 58.
Endless belt 14is a steel beltwhose surface is mirror-polished. Synthetic resin coating of sheet paper adheres onto the endless belt 14 and is transferred by the belt 14. The sheet paper and its synthetic resin coating is heated and melted by the
belt 14 and then rapidly cooled for calendering and, finally, sheet paper is peeled offfrom the belt 14 near the sheet discharging table 34. That is to say, the
endless belt 14 is transfer means as well as heat
conduction means of sheet paper and, thereby, an
automatic calendar apparatus is obtained. The end- less belt 14, wound and rotated between the main
roller 18 and the delivery roller 58, goes immediately intothecooling room 26 after heated bythe main
roller 18.Cooling room 26 is a compartment provided
nearthe main roller and surroundsthe moved endless
belt 14. In the cooling room 26 are provided a plurality of cold watershower 28. Cooling wateris poured from the watershowerto the inner surface of the endless belt 14so as rapidlyto cool the endless belt 14.
Thereby, sheet paper and its synthetic resin coating formerly melted is cooled rapidly for calendering by solidifying and mirror-finishing the coating. Water curtain wall maywell be provided in place of cold water shower 28 in orderto get rid of heat from the endless belt 14. Coolingwaterpouredfromthewater shower 28 is, after washing th inner surface of the endless belt 14, drained from theapparatusthrough a drainage not shown. Without sayingrsuch cold waster can be reused afterfiltering and coolingthem Descriptions offiltrating means and pumpsare omitted, because such means arewell known.
Numerals 60 and 62 indicate guide rollers for tensioning the endless belt 14. Numeral 64 indicates a transfer belt which takes up sheet paperfor sending it to sheet discharging table 34, as sheet paper is peeled offfrom the endless belt 14when sheet paper is cooled rapidly. After passing through the delivery roller 58, the endless belt 14 returns to the main roller 18 without going through prior art pre-heating room.
As is described in detail, in calendering apparatus according to the present invention, the endless belt is heated by circulating thermal fluid such as steam in the main roller. Accordingly, surface temperature of main roller can be kept below 1 OO"C, as temperature of thermal fluid does not exceed 120"C. Thereby, deterioration of printing ink or coated synthetic resin will not occur. Also, heat distribution of main roller is perfectly uniform, therefore, sufficient calendering without any unevenness can be effected. Further, as the endless belt is rapidlycooled by cooling water shower, no noise will be made. Moreover, beautiful calendering surface can be assured, as the synthetic resin coating is rapidly solidified. In addition, dimension of apparatus can extremely be minimized, as a pre-heat room is not at all necessary.
Many other applications and modifications are possible in relation to the present invention. The present invention is not limited to those shown and described hitherto.
Claims (4)
1. Apparatus for calendering sheet paper comprising; a . .a main rollerwhich is rotated by drive means provided near a sheet inserting table and has a hollow portion in which thermal fluid is circulated in order to heat an endless belt by conductive heat of thermal fluid, meansforfeeding ... meansforfeeding thermal fluid to the hollow portion of main roller, a a a metallic endless beltthe surface of which is polished and which is wound between the main roller and a delivery roller near a sheet discharging table, a a a press roller which is adjustably in contact with the main roller by way ofthe endless belt,
...a cooling room which is provided near the main rollerandsurroundstheendless belt and, ... a cold water shower which pours cooling waterto the inner surface of the endless belt in the cooling room for rapidly cooling the endless belt.
2. An apparatus according to claim 1, wherein steam is fed as thermal fluid by thermal fluid feeding means.
3. An apparatus according to claim 1, wherein oil is fedas thermal fluid by thermal fluid feeding means.
4. An apparatus for calendering sheet paper sub stantial ly as herein described with reference to and as shown in the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8305937A GB2136027B (en) | 1983-03-03 | 1983-03-03 | Calendering sheet paper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8305937A GB2136027B (en) | 1983-03-03 | 1983-03-03 | Calendering sheet paper |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8305937D0 GB8305937D0 (en) | 1983-04-07 |
| GB2136027A true GB2136027A (en) | 1984-09-12 |
| GB2136027B GB2136027B (en) | 1986-09-24 |
Family
ID=10538961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8305937A Expired GB2136027B (en) | 1983-03-03 | 1983-03-03 | Calendering sheet paper |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2136027B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0478525A2 (en) * | 1990-09-20 | 1992-04-01 | Oy Keskuslaboratorio - Centrallaboratorium Ab | Procedure and apparatus for glazing a paper or cardboard web |
| US5357854A (en) * | 1992-08-12 | 1994-10-25 | Epic Products International Corp. | Method for high-speed calendering |
| WO2000017448A2 (en) * | 1998-09-24 | 2000-03-30 | Sullivan William A | Image bearing substrate having increased density and method of forming same |
| US6213010B1 (en) * | 1999-01-18 | 2001-04-10 | Pierluigi Bolzoni | Wood sheet heat treatment method and plant |
| US6937358B2 (en) | 2000-02-10 | 2005-08-30 | Technology Innovations, Llc | Printable substrate having controllable thickness and method of making and using the same |
| CN111622010A (en) * | 2020-06-16 | 2020-09-04 | 杭州羽邦印务有限公司 | A press polish cooling body for glazing press polish integration equipment |
-
1983
- 1983-03-03 GB GB8305937A patent/GB2136027B/en not_active Expired
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0478525A2 (en) * | 1990-09-20 | 1992-04-01 | Oy Keskuslaboratorio - Centrallaboratorium Ab | Procedure and apparatus for glazing a paper or cardboard web |
| EP0478525A3 (en) * | 1990-09-20 | 1992-07-22 | Oy Keskuslaboratorio - Centrallaboratorium Ab | Procedure and apparatus for glazing a paper or cardboard web |
| US5357854A (en) * | 1992-08-12 | 1994-10-25 | Epic Products International Corp. | Method for high-speed calendering |
| WO2000017448A2 (en) * | 1998-09-24 | 2000-03-30 | Sullivan William A | Image bearing substrate having increased density and method of forming same |
| WO2000017448A3 (en) * | 1998-09-24 | 2000-05-25 | William A Sullivan | Image bearing substrate having increased density and method of forming same |
| US6213010B1 (en) * | 1999-01-18 | 2001-04-10 | Pierluigi Bolzoni | Wood sheet heat treatment method and plant |
| US6937358B2 (en) | 2000-02-10 | 2005-08-30 | Technology Innovations, Llc | Printable substrate having controllable thickness and method of making and using the same |
| CN111622010A (en) * | 2020-06-16 | 2020-09-04 | 杭州羽邦印务有限公司 | A press polish cooling body for glazing press polish integration equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8305937D0 (en) | 1983-04-07 |
| GB2136027B (en) | 1986-09-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |