EP0378731A1 - Varnishing furnace - Google Patents
Varnishing furnace Download PDFInfo
- Publication number
- EP0378731A1 EP0378731A1 EP89100977A EP89100977A EP0378731A1 EP 0378731 A1 EP0378731 A1 EP 0378731A1 EP 89100977 A EP89100977 A EP 89100977A EP 89100977 A EP89100977 A EP 89100977A EP 0378731 A1 EP0378731 A1 EP 0378731A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- furnace
- workpiece
- varnishing
- ultrared
- painting
- 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
- 230000005855 radiation Effects 0.000 claims abstract description 14
- 238000010422 painting Methods 0.000 claims description 17
- 230000035515 penetration Effects 0.000 description 3
- 230000037303 wrinkles Effects 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
- F26B3/30—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun from infrared-emitting elements
Definitions
- This invention relates to a varnishing furnace which utilizes specially arranged near-ultrared radiation bulbs to bake a workpiece.
- the varnishing furnace on the market generally falls into three categories: the electric varnishing furnace, the gas varnishing furnace, and the medium- or far-ultrared varnishing furnace.
- the first two kinds of varnishing furnaces are seldom used due to their poor productivity, insufficient safety and high cost.
- the medium or far-ultrared furnace which is provided with medium- or far-ultrared radiation bulbs at one or both sides, becomes the most commonly used furnace for baking.
- the medium- or far-ultrared ray is rather long is wavelength, the penetration capability thereof is poor. Further, it requires a long period of time to raise the temperature and so it is impossible for them to dry the painting on the workpiece in a short period of time, thereby causing the following drawbacks:
- the varnishing furnace 1 is provided with three rows of near-ultrared radiation bulbs 2 on one side, both sides, or both sides and bottom thereof. There is a distance betweeen every two rows of near-ultrared radiation bulbs 2. Then, the space enclosed by or just in front of the near-ultrared radiation bulbs 2 forms a high temperature region 3 while the space between two rows of near-ultrared radiation bulbs 2 builds up a low temperature region 4. Looking now at FIG. 2, when a workpiece 5 enters into the varnishing furnace 1, the workpiece 5 is first preheated at a low temperature region 4 and then passed through a high temperature region 3.
- the temperature of the workpiece 5 will produce heat due to the vigorous oscillation between the parties thereof and this will decrease the temperature difference between the upper and lower layers of painting on the workpiece 5.
- the time required for the solvent in the upper and lower layers of painting on the workpiece 5 to vaporize will be nearly the same thereby decreasing the occurrence of so-called pin hole and baking dead points.
- the time difference between the solidifying of the the upper and lower layers of painting on the workpiece 5 will be diminished, avoiding the occurrence of so-called wrinkles.
- the workpiece 5 passes through a low temperature region 4 where the workpiece 5 is only subject to indirect heat through the air.
- the temperature at the low temperature region 4 will be lower than that at the high temperature region 3.
- the low temperature region 4 is designed so that the temperature thereat is lower than that required for solidifying the painting on the workpiece 5. Meanwhile, the temperature of the workpiece 5 is gradually increased eliminating the time difference for the upper and lower layers of painting on the workpiece 5 to vaporize or solidify. Lastly, the workpiece 5 passes a number of high and low temperature regions alternatively diposed for baking.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Paints Or Removers (AREA)
- Baking, Grill, Roasting (AREA)
- Electric Stoves And Ranges (AREA)
Abstract
Description
- This invention relates to a varnishing furnace which utilizes specially arranged near-ultrared radiation bulbs to bake a workpiece.
- The varnishing furnace on the market generally falls into three categories: the electric varnishing furnace, the gas varnishing furnace, and the medium- or far-ultrared varnishing furnace. However, the first two kinds of varnishing furnaces are seldom used due to their poor productivity, insufficient safety and high cost. Then, the medium or far-ultrared furnace, which is provided with medium- or far-ultrared radiation bulbs at one or both sides, becomes the most commonly used furnace for baking. Nevertheless, since the medium- or far-ultrared ray is rather long is wavelength, the penetration capability thereof is poor. Further, it requires a long period of time to raise the temperature and so it is impossible for them to dry the painting on the workpiece in a short period of time, thereby causing the following drawbacks:
- 1. Since the temperature rising rate is slow, it is necessary to have a long furnace so as to increase the baking time hence easily overheating the workpiece and causing the painting to become a layer of so-called skin.
- 2. Since the heat penetration capability is poor, the upper and lower layers of the painting will be subject to different temperatures and the solvent in the lower layer of painting and the upper layer of painting will require different periods of time to vaporize thereby forming so-called pin holes or wrinkels on the upper layer of painting on the workpiece.
- 3. Since the time for baking is rather long, the electricity cost will be increased and the chance for the dust particle to adhere to the surface of the workpiece will become greater.
- 4. Since the furnaces have a long body, it will be necessary to prepare a large space to accomodate them.
- 5. Since the medium- and far-ultrared rays cannot raise the temperature in a short time and have weak penetration capability, it will be difficult to bake the recess of a workpiece.
- Anyhow, in case the medium- and far-ultrared radiation bulbs are replaced with near-ultrared radiation ones, the temperature will be raised in a short time but there will be the following two defects at the same time:
- 1. Since the near-ultrared ray will provide higher temperature, the painting on the workpiece will be easily overheated.
- 2. If the baking time is reduced in order to avoid overheating, it is easier to form so-called pin holes or wrinkles on the painting on the workpiece.
- It is, therefore, an object of the present invention to provide a varnishing furnace which may obviate and mitigate the above-mentioned drawbacks.
- It is the primary object of the present invention to provide a varnishing furnace which can dry the painting on the workpiece in a short time.
- It is another object of the present invention to provide a varnishing furnace which may obviate the occurrence of so-called pin hole, wrinkle or dead point on the workpiece during baking.
- It is still another object of the present invention to provide a varnishing furnace which may avoid the occurrence of so-called skin.
- It is still another object of the present invention to provide a varnishing furnace which has a rather short body in comparison with the conventional.
- It is still another object of the present invention to provide a varnishing furnace which is energy-saving.
- It is still another object of the present invention to provide a varnishing furnace which can reduce the chance of dust particle in the air to adhere to the surface painting of the workpiece.
- It is a further object of the present invention to provide a varnishing furnace which can make the painting firmly adhere on the workpiece.
- The preferred embodiment of the present invention will be described in detail in conjunction with the accompanying drawings wherein like numberals refer to like or similar parts and in which:
- FIG. 1 is a perspective view, partly broken, of a varnishing furnace according to the preferred embodiment of the present invention; and
- FIG. 2 shows the working procedures of the present invention;
- With reference first to FIG. 1, the
varnishing furnace 1 according to the present invention is provided with three rows of near-ultrared radiation bulbs 2 on one side, both sides, or both sides and bottom thereof. There is a distance betweeen every two rows of near-ultrared radiation bulbs 2. Then, the space enclosed by or just in front of the near-ultrared radiation bulbs 2 forms ahigh temperature region 3 while the space between two rows of near-ultrared radiation bulbs 2 builds up alow temperature region 4. Looking now at FIG. 2, when aworkpiece 5 enters into thevarnishing furnace 1, theworkpiece 5 is first preheated at alow temperature region 4 and then passed through ahigh temperature region 3. Since the near-ultrared radiation bulbs 2 can increase the temperature quickly, the temperature of theworkpiece 5 will produce heat due to the vigorous oscillation between the parties thereof and this will decrease the temperature difference between the upper and lower layers of painting on theworkpiece 5. Hence, the time required for the solvent in the upper and lower layers of painting on theworkpiece 5 to vaporize will be nearly the same thereby decreasing the occurrence of so-called pin hole and baking dead points. Further, the time difference between the solidifying of the the upper and lower layers of painting on theworkpiece 5 will be diminished, avoiding the occurrence of so-called wrinkles. Thereafter, theworkpiece 5 passes through alow temperature region 4 where theworkpiece 5 is only subject to indirect heat through the air. This is because the near-ultrared radiation bulbs 2 has a short wavelength and small radiation range. Apparently, the temperature at thelow temperature region 4 will be lower than that at thehigh temperature region 3. Thelow temperature region 4 is designed so that the temperature thereat is lower than that required for solidifying the painting on theworkpiece 5. Meanwhile, the temperature of theworkpiece 5 is gradually increased eliminating the time difference for the upper and lower layers of painting on theworkpiece 5 to vaporize or solidify. Lastly, theworkpiece 5 passes a number of high and low temperature regions alternatively diposed for baking. - Other embodiments and modifications will occur to those skilled in the art. No attempts has been made to illustrate all possible embodiments of the invention, but rather intended such alternations and further applications as illustrated herein being contemplated as would normally occur to one skilled in the art to which the invention relates.
Claims (2)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT89100977T ATE84362T1 (en) | 1989-01-20 | 1989-01-20 | VARNISH OVEN. |
EP89100977A EP0378731B1 (en) | 1989-01-20 | 1989-01-20 | Varnishing furnace |
DE8989100977T DE68904303D1 (en) | 1989-01-20 | 1989-01-20 | FIRNIS OVEN. |
AU41163/89A AU600623B1 (en) | 1989-01-20 | 1989-09-08 | Varnishing furnace |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP89100977A EP0378731B1 (en) | 1989-01-20 | 1989-01-20 | Varnishing furnace |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0378731A1 true EP0378731A1 (en) | 1990-07-25 |
EP0378731B1 EP0378731B1 (en) | 1993-01-07 |
Family
ID=8200883
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89100977A Expired - Lifetime EP0378731B1 (en) | 1989-01-20 | 1989-01-20 | Varnishing furnace |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0378731B1 (en) |
AT (1) | ATE84362T1 (en) |
AU (1) | AU600623B1 (en) |
DE (1) | DE68904303D1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002070973A1 (en) * | 2001-03-01 | 2002-09-12 | Adphos | Method for producing a coating on a quasi-continuously fed material strip |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2498878A (en) * | 1944-05-02 | 1950-02-28 | Trumbull Electric Mfg Co | Infrared baking oven |
US2660723A (en) * | 1951-03-06 | 1953-12-01 | Delamarre Emile Jules | Apparatus for the stabilization of ivory |
DE1097369B (en) * | 1954-01-02 | 1961-01-12 | Daimler Benz Ag | Method for controlling the heating of tunnel dryers |
FR1303765A (en) * | 1961-10-13 | 1962-09-14 | Infrared radiation drying gantry for motor vehicles or others | |
GB2096294A (en) * | 1981-02-25 | 1982-10-13 | Svecia Silkscreen Maskiner Ab | Drier |
EP0095717A1 (en) * | 1982-05-27 | 1983-12-07 | Ernest Picot | Heating tunnel |
-
1989
- 1989-01-20 AT AT89100977T patent/ATE84362T1/en not_active IP Right Cessation
- 1989-01-20 DE DE8989100977T patent/DE68904303D1/en not_active Expired - Lifetime
- 1989-01-20 EP EP89100977A patent/EP0378731B1/en not_active Expired - Lifetime
- 1989-09-08 AU AU41163/89A patent/AU600623B1/en not_active Ceased
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2498878A (en) * | 1944-05-02 | 1950-02-28 | Trumbull Electric Mfg Co | Infrared baking oven |
US2660723A (en) * | 1951-03-06 | 1953-12-01 | Delamarre Emile Jules | Apparatus for the stabilization of ivory |
DE1097369B (en) * | 1954-01-02 | 1961-01-12 | Daimler Benz Ag | Method for controlling the heating of tunnel dryers |
FR1303765A (en) * | 1961-10-13 | 1962-09-14 | Infrared radiation drying gantry for motor vehicles or others | |
GB2096294A (en) * | 1981-02-25 | 1982-10-13 | Svecia Silkscreen Maskiner Ab | Drier |
EP0095717A1 (en) * | 1982-05-27 | 1983-12-07 | Ernest Picot | Heating tunnel |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002070973A1 (en) * | 2001-03-01 | 2002-09-12 | Adphos | Method for producing a coating on a quasi-continuously fed material strip |
Also Published As
Publication number | Publication date |
---|---|
DE68904303D1 (en) | 1993-02-18 |
AU600623B1 (en) | 1990-08-16 |
EP0378731B1 (en) | 1993-01-07 |
ATE84362T1 (en) | 1993-01-15 |
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