TWM573117U - Oven device preventing ink volatilization particles from contaminating heater - Google Patents

Abstract

The present invention provides an oven device for preventing ink volatilization particles from contaminating a heater, comprising a heating chamber formed in the oven, the heating chamber being connected to an inlet end and an exhaust end provided in the oven, so that the a circulating airflow for generating a baked object in the heating chamber, an inlet flow path is disposed between the inlet end and the heating chamber, and the heater is disposed in the intake flow passage, the intake air flow The normal temperature air that guides the outside of the channel through the inlet end contacts the heater and becomes hot air before being introduced into the heating chamber. Thereby, the problem that the ink volatilization particles are contaminated by the heater due to the direct contact with the circulating airflow in the oven at normal temperature is improved.

Description

Oven device for preventing ink volatilization particles from contaminating heater

The present invention relates to an oven structure, and more particularly to an oven apparatus for preventing ink volatilization particles from contaminating a heater.

The oven to which the present invention is directed means an industrial oven, particularly an oven for baking articles that have been coated with a volatile particle coating. In today's industry, the process of producing such items as printed circuit boards (PCBs) generally involves processes such as ink coating, drying, baking, and cleaning. Among them, the hot temperature generated by the oven is used to bake the wet ink that has been applied on the printed circuit board, so that the wet ink can be cured and stably attached to the printed circuit board.

Since the wet ink is heated and baked in the oven, it will volatilize to form tiny ink particles, which will affect the heater in the oven.

Further, please refer to FIG. 1 and FIG. 2 together to exemplify the structure of two conventional ovens, which illustrate that heating chambers 11a for baking objects (for example, printed circuit boards) are respectively formed in the conventional ovens 10a and 10b. 11b, the ovens 10a, 10b are also provided with air inlet ends 12a, 12b and exhaust ends 13a, 13b that communicate with the heating chambers 11a, 11b, and normal temperature air is introduced into the heating chambers 11a, 11b via the inlet ends 12a, 12b. Mixed with the circulating airflow, the heating chambers 11a, 11b are provided with heaters 20a, 20b for heating the circulating airflow, and the normal temperature air is heated by the heating of the heaters 20a, 20b, and the hot air is in the heating chamber 11a, In the 11b, the wind turbines 30a, 30b are driven to generate the circulating airflows 16a, 16b for the baked objects, and the circulating airflows 16a, 16b are discharged to the outside via the exhaust ends 13a, 13b.

Further, when coated with wet ink (such as printed electricity) When the substrate is baked in the heating chambers 11a, 11b, the volatile solvent contained in the ink is volatilized by the high temperature in the heating chambers 11a, 11b; for example, the curing temperature is generally 150 ° C. Ink, the ink particles usually start to volatilize at about 80 ° C, and the ink particles generate the maximum amount of volatilization at about 120 ° C. Therefore, the articles coated with the wet ink receive the heaters 20a, 20b in the heating chambers 11a, 11b. During the baking process from room temperature to curing ink temperature of 150 ° C, especially when the temperature of the heating chambers 11a, 11b reaches 80 ° C ~ 150 ° C, the wet ink on the surface of the object will form ink volatilized particles dispersed in the heating chamber. In the chambers 11a, 11b, the circulating airflows 16a, 16b for heating the objects in the heating chambers 11a, 11b will drive the ink volatile particles to be filtered through the exhaust ends 13a, 13b and discharged to the outside.

However, the problem is that when normal temperature air is injected into the heating chambers 11a, 11b via the inlet ends 12a, 12b, the normal temperature air directly strikes and contacts the circulating airflows 16a, 16b due to the temperature of the circulating airflows 16a, 16b (about Between 80 ° C and 150 ° C) is much higher than normal temperature air (for example, 25 ° C), which causes a considerable temperature difference between the circulating airflows 16a, 16b and the normal temperature air, forcing the temperature of the circulating airflows 16a, 16b to also In this case, the ink volatilization particles driven by the circulating airflows 16a, 16b are condensed by a sudden drop in temperature, and are contaminated (or adhered) to the heaters 20a, 20b having a plurality of air passages. In particular, when the amount of ink volatilization particles adhering to the heaters 20a, 20b is excessive, the effects of the heat release of the heaters 20a, 20b are affected, and the heat accumulation of the heaters 20a, 20b is easily caused to be damaged. And the fire has occurred. In order to avoid this, the operator must frequently clean or replace the heaters 20a, 20b in the ovens 10a, 10b, but has caused troubles in equipment maintenance.

Therefore, how to improve the ink volatilization of the heater in the traditional oven has become a technical problem to be overcome.

In view of this, the technical problem to be solved by the present invention is to improve the structural design of the air flow passage in the heating chamber of the conventional oven, so that the volatile particles of the ink are not easily contaminated by the heater to prolong the service life of the heater.

To this end, the present invention provides a method for preventing ink volatilization particles from being contaminated and heated. The oven device comprises: a heating chamber formed in the oven, the heating chamber communicates with an inlet end and an exhaust end provided in the oven, so that the heating chamber generates a baked object a circulating airflow; an intake air passage is disposed between the air inlet end and the heating chamber, and the heater is disposed in the intake air passage, and the air inlet passage is through the air inlet end The ambient air that is directed to the outside is first introduced into the heating chamber after it contacts the heater and becomes hot air.

In a further implementation, the inlet flow path is in direct contact with the heater by the circulating air flow.

In a further implementation, the heating chamber is provided with a wind wheel that drives hot air to form the circulating air flow. The wind wheel is located between the air inlet end and the exhaust end.

In a further implementation, the air inlet end is provided with a blower, and the air blower is forcibly introduced into the intake air flow path from the outside.

According to the above device, the technical effect of the present invention is that the air is introduced into the heating chamber after being heated to become hot air at normal temperature, so that the normal temperature air does not directly contact the circulating air flow in the oven, and the temperature of the circulating air flow suddenly drops. It can prevent the ink volatilization particles from adhering to the heater due to condensation, and can effectively improve the problem that the volatile particles of the ink in the conventional oven are easily contaminated by the heater.

In addition, the relevant technical details that can be implemented by the present invention will be explained in the following embodiments and drawings.

10a, 10b, 10c, 10d, 10e‧‧‧Oven

101‧‧‧ inner casing

102‧‧‧Outer casing

103‧‧‧Insulation

11a, 11b, 11d, 11e‧‧‧ heating chamber

12a, 12b, 12c, 12d, 12e‧‧‧ inlet end

13a, 13b, 13d‧‧‧ exhaust end

14‧‧‧Airflow passage

15‧‧‧Baffle

16a, 16b, 16c, 16d, 16e‧‧‧Circular flow

17c, 17d, 17e‧‧‧ intake runner

18d, 18e‧‧ ‧ partition

20a, 20b, 20c, 20d, 20e‧‧‧heater

30a, 30b, 30d‧‧‧ wind wheels

31‧‧‧Motor

40‧‧‧Blowers

Description of the steps of the S1 to S3‧‧‧ examples

Figure 1 is a cross-sectional view of a conventional tunnel oven.

2 is a cross-sectional view of a conventional box type oven.

Figure 3 is a flow chart of the method of the novel step.

Figure 4 is a diagram showing the basic structure of the oven required to carry out the steps S1 to S3 shown in Figure 3.

Figure 5 is a cross-sectional view of an embodiment of the first tunnel oven of the present invention.

Fig. 6 is a schematic view showing the operation of Fig. 5;

Figure 7 is a cross-sectional view of an embodiment of the second box oven of the present invention.

Figure 8 is a schematic view of the operation of Figure 7.

Referring to FIG. 3, the present invention provides an oven apparatus for preventing ink volatilization particles from being contaminated by a heater, which can be easily implemented by a method for preventing ink volatilization particles from being contaminated by a heater in which an ink is prevented from being contaminated by heating. The method includes the following steps S1 to S3:

Step S1: interval normal temperature air and circulating air flow;

Referring to FIG. 4, an intake air passage 17c is disposed in the oven 10c. The intake air passage 17c communicates with the air inlet end 12c, and the ambient air of the outside passes through the air inlet end 12c and the intake air flow path 17c. Introduced into the oven 10c, the heater 20c is disposed in the intake passage 17c, so that the normal temperature air first contacts the heater 20c and then contacts the circulating airflow 16c in the oven 10c, so that the normal temperature air cannot directly contact the circulating airflow in the oven 10c. 16c, it can be avoided that the circulating airflow 14c in the oven 10c is lowered in temperature due to direct contact with normal temperature air.

Step S2: heating the ambient air

Referring to Fig. 4 again, it is explained that the normal temperature air is heated to the hot air by the heater 20c, and then the circulating airflow 16c in the oven 10c is contacted, so that the temperature drop of the circulating airflow 16c can be avoided. Further, the heater 20c is provided in the oven 10c to heat the room temperature air, and can prevent the temperature loss heat energy from occurring in the process of being introduced into the oven 10c after the outside air is heated to the outside of the oven 10c, or an additional heat preservation is required. Pipes or insulated runners can introduce hot air into the oven 10c, causing a burden on the structure of the equipment.

Step S3: contacting the circulating airflow;

Referring to FIG. 4 again, the air inlet end 12c forcibly guides the normal temperature air into the oven 10c from the outside, so that the normal temperature air contacts the circulating airflow 16c through the heater 20c, and the wind pressure generated when the normal temperature air enters the oven 10c. In order to prevent the circulating airflow 16c in the oven 10c from flowing backward into the intake runner 17c and directly contacting the heater 20c, it is possible to prevent the ink volatilization particles from the circulating airflow 16c from contaminating the heater 20c.

On the other hand, please refer to Fig. 5 and Fig. 6 to explain the first preferred embodiment of the oven apparatus of the present invention, illustrating the implementation of the novel in a tunnel oven. The structure disclosed in FIG. 5 and FIG. 6 includes a heating chamber 11d and an intake runner 17d in addition to the basic structure disclosed in FIG. The heating chamber 11d is formed in the oven 10d. The oven 10d includes an inner casing 101 and an outer casing 102 covering the inner casing 101. The heating chamber 11d is formed therein. Inside the housing 101. A heat insulating layer 103 having a heat insulating effect is disposed between the inner casing 101 and the outer casing 102. Further, the oven 10d is provided with an inlet end 12d and an exhaust end 13d that communicate with the heating chamber 11d, so that ambient outside air enters the heating chamber 11d via the inlet end 12d, and then passes through the exhaust. The end 13d leaves, thereby generating a circulating airflow 16d. Further, a plurality of baffles 15 are disposed in the heating chamber 11d, and a flow passage 14 is formed in the heating chamber 11d by the deflector 15, and the air flow passage 14 is connected to the air inlet end 12d and the row The gas end 13d is in communication, and the circulating air flow 16d flows in the heating chamber 11d along the air flow passage 14.

An electrothermal heater 20d is disposed in the heating chamber 11d to allow normal temperature air to be heated by heating of the heater 20d. A heating wheel 30d is disposed in the heating chamber 11d. The wind wheel 30d is located in the flow passage 14 between the inlet end 12d and the exhaust end 13d. The wind wheel 30d is pivotally connected to a motor 31, and the wind wheel 30d is rotated by the driving of the motor 31, and the hot air in the heating chamber 11d can be driven to flow along the air flow passage 14 by the rotation of the wind wheel 30d. The hot air leaves the heating chamber 11d via the exhaust end 13d, thereby generating a circulating airflow 16d for baking the article.

The intake air passage 17d is disposed between the air inlet end 12d and the heating chamber 11d. The intake air passage 17d is in communication with the air flow passage 14, and the ambient normal temperature air passes through the air inlet end 12d through the intake air. The flow path 17d is introduced into the heating chamber 11d. Further, the heater 20d is disposed in the intake air passage 17d, and the outside ambient air is introduced into the heating chamber 11d after contacting the heater 20d to become hot air.

The intake flow passage 17d is implemented by at least one partition 18d. The heating chamber 11d is formed at intervals. The partition 18d can directly contact the circulating airflow 16d in the heating chamber 11d at a normal temperature of the air inlet end 12d, and can also directly circulate the circulating airflow 16d in the heating chamber 11d. The heater 20d is contacted, thereby preventing the circulating airflow 16d in the heating chamber 11d from being in direct contact with the normal temperature air to maintain the temperature of the circulating airflow 16d, and avoiding the ink volatile particles contaminated by the circulating airflow 16d from contaminating the heater 20d. . Further, the air inlet end 12d is provided with a blower 40, and the blower 40 is forcibly introduced into the intake air passage 17d from the outside, so that the air pressure in the intake air passage 17d is larger than that in the heating chamber 11d. The air pressure prevents the circulating airflow 16d in the heating chamber 11d from flowing backward into the intake flow passage 17d.

In addition, please refer to FIG. 7 and FIG. 8 to illustrate a second preferred embodiment of the oven apparatus of the present invention, illustrating the difference between the present embodiment and the first embodiment by implementing the present invention on a box type oven. The difference between the positions of the inlet ends 12d and 12e of the first embodiment is that the inlet end 12d of the first embodiment is disposed on the side of the oven 10d, and the inlet end 12e of the present embodiment is the top of the oven 10e. Although the inlet ends 12d and 12e of the two are different in position, the inlet air passages 17d and 17e formed by the partitions 18d and 18e can be used to prevent the normal temperature air introduced from the inlet ends 12d and 12e directly. Contacting the circulating airflows 16d, 16e in the heating chambers 11d, 11e, and maintaining the temperature of the circulating airflows 16d, 16e in the heating chambers 11d, 11e, can effectively prevent the problem that the ink volatile particles contaminate the heaters 20d, 20e due to condensation. .

The above embodiments are merely illustrative of the preferred embodiments of the present invention, but are not to be construed as limiting the scope of the present invention. Therefore, the present invention is subject to the content of the claims defined in the scope of the patent application.

Claims (5)

An oven device for preventing ink volatilization particles from contaminating a heater, comprising: a heating chamber formed in the oven, the heating chamber communicating with an inlet end and an exhaust end provided in the oven to heat the furnace a circulating airflow for generating a baked object in the chamber; an intake air passage disposed between the air inlet end and the heating chamber, wherein the heater is disposed in the intake air passage, the air inlet The normal temperature air that guides the outside of the flow path through the inlet end contacts the heater and becomes hot air before being introduced into the heating chamber. An oven apparatus for preventing ink evaporating particles from contaminating a heater according to claim 1, wherein the intake flow path is in direct contact with the heater by the circulating air flow. An oven apparatus for preventing ink evaporating particles from contaminating a heater according to claim 1, wherein the heating chamber is provided with a wind wheel that drives hot air to form the circulating air flow. An oven apparatus for preventing ink evaporating particles from contaminating a heater according to claim 3, wherein the wind wheel is located between the air inlet end and the exhaust end. An oven apparatus for preventing ink evaporating particles from contaminating a heater according to claim 1, wherein the air inlet end is provided with a blower, and the air blower is forcibly introduced into the intake air passage from the outside.