TWI684738B - Method and device for preventing ink volatile particles from contaminating heater in oven - Google Patents

Abstract

The invention provides a method for preventing the volatile particles of ink from contaminating the heater in an oven, which includes spacing the room temperature air introduced into one of the air inlets of the oven to eliminate direct contact between the room temperature air and the circulating air flow in the oven, allowing the room temperature air to pass first Only after the heater is heated does it come into contact with the circulating air flow in the oven. The invention further provides a device for preventing the volatile particles of the ink from contaminating the heater in the oven required for implementing the above method. In this way, the problem that the normal temperature air directly contacts the circulating air flow in the oven and the ink volatile particles contaminate the heater is improved.

Description

Method and device for preventing ink volatile particles from contaminating heater in oven

The invention relates to an oven structure, in particular to a method and a device for preventing ink volatile particles from contaminating a heater in an oven.

The oven to which the present invention is directed refers to an oven for industrial use, especially an oven used for baking objects coated with a coating of volatile particles. In today's industry, the process of producing objects such as printed circuit boards (PCBs) generally goes through processes such as ink coating, drying, baking, and cleaning. Among them, the heat temperature generated by the oven is used to bake the wet ink coated on the printed circuit board, so that the wet ink can be cured and adhere to the printed circuit board stably.

As 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 illustrate the structure of two conventional ovens. It is shown that heating chambers 11a for baking objects (such as printed circuit boards) are formed in the conventional ovens 10a and 10b, respectively. , 11b, the ovens 10a, 10b are also provided with air inlet ends 12a, 12b and exhaust ends 13a, 13b communicating with the heating chambers 11a, 11b, and normal temperature air is introduced into the heating chambers 11a, 11b through the air inlet ends 12a, 12b Mixed with the circulating air flow, the heating chambers 11a, 11b are provided with heaters 20a, 20b for heating the circulating air flow. By heating the heaters 20a, 20b, the normal temperature air becomes hot air. The hot air is in the heating chamber 11a, 11b receives the driving of the wind wheels 30a and 30b to generate circulating airflows 16a and 16b for baking objects, and the circulating airflows 16a and 16b are discharged to the outside through the exhaust ends 13a and 13b.

Furthermore, when an article coated with wet ink (such as Road substrate) When baking in the heating chambers 11a, 11b, the volatile solvent contained in the ink will be volatilized due to the high temperature in the heating chambers 11a, 11b; for example, the curing temperature is generally 150°C Ink, the ink particles usually begin to volatilize at around 80°C, and the ink particles will generate the maximum amount of volatilization at around 120°C. Therefore, the objects coated with wet ink receive the heaters 20a, 20b in the heating chambers 11a, 11b. During the baking process from normal temperature baking to the curing ink temperature of 150°C, especially when the temperature of the heating chambers 11a and 11b reaches the range of 80°C to 150°C, the wet ink on the surface of the object will form ink volatile particles and be dispersed in the heating chamber In the chambers 11a and 11b, the circulating air currents 16a and 16b in the heating chambers 11a and 11b for baking objects will drive the ink volatile particles to be discharged to the outside after being filtered through the exhaust ends 13a and 13b.

However, the problem is that when normal-temperature air is injected into the heating chambers 11a, 11b through the air inlets 12a, 12b, the normal-temperature air directly impacts and contacts the circulating airflow 16a, 16b. Due to the temperature of the circulating airflow 16a, 16b (about Between 80°C and 150°C) much higher than normal temperature air (take 25°C as an example), which causes a considerable temperature difference between the circulating airflow 16a, 16b and the normal temperature air, forcing the temperature of the circulating airflow 16a, 16b In this case, the volatile particles of the ink driven by the circulating air currents 16a and 16b condense due to the sudden temperature drop, and then contaminate (or stick to) the heaters 20a and 20b with many air passages. In particular, when the ink volatile particles attached to the heaters 20a and 20b are too much, it will affect the effect of the heaters 20a and 20b to release heat energy, and even easily cause heat stasis and damage to the heaters 20a and 20b. And caused a fire. In order to avoid this phenomenon, the manufacturer must frequently clean or replace the heaters 20a, 20b in the ovens 10a, 10b, but this has caused troubles in equipment maintenance.

Therefore, how to improve the contamination of heaters with ink volatile particles in traditional ovens 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 channel in the heating chamber of the conventional oven, so that the ink volatile particles are not likely to contaminate the heater, so as to extend the life of the heater.

To this end, one object of the present invention is to provide an oil-preventing oven The method of contaminating the heater with ink volatile particles includes: spacing the room temperature air introduced into one of the air inlets of the oven to eliminate direct contact between the room temperature air and the circulating air flow in the oven, so that the room temperature air first passes through the heating of the heater Only in contact with the circulating air flow in the oven.

In a further implementation, it also includes excluding the circulating airflow in the oven from directly contacting the heater.

In a further implementation, the heater heats normal temperature air in the oven.

In a further implementation, the air inlet forcibly guides normal temperature air into the oven from the outside

The above method can be achieved through a device technology. To this end, a specific embodiment of the present invention is to provide an oven device that prevents ink volatile particles from contaminating the heater. The technical means include: a heating chamber formed in the oven , The heating chamber is connected to an air inlet end and an exhaust end provided in the oven, so that a circulating air flow for baking objects is generated in the heating chamber; an air inlet flow channel is built in the air inlet Between the end and the heating chamber, and the heater is disposed in the intake air flow path, and the air intake flow path guides the ambient air at the outside through the air intake end first to contact the heater to become hot air. Introduced into the heating chamber; wherein the air inlet flow path is formed in the heating chamber through at least one partition, and the partition directly contacts the circulating air flow in the heating chamber with the room temperature air at the inlet end.

In a further implementation, the baffle directly contacts the heater across the circulating wind flow.

In a further implementation, a wind wheel driving hot air to form the circulating wind flow is arranged in the heating chamber. The wind wheel is located between the inlet end and the exhaust end.

In a further implementation, a blower is arranged at the air inlet end, and the blower extracts normal temperature air from the outside and forcibly introduces it into the intake flow path.

According to the above technical means, the technical effect of the present invention is that the room temperature air is introduced into the heating chamber after being heated into hot air, so that the room temperature air is not It will directly contact the circulating air flow in the oven and cause the temperature of the circulating air flow to drop suddenly, which can prevent the volatile ink particles from adhering to the heater due to condensation, which can effectively improve the problem that the volatile ink particles in the traditional oven easily contaminate the heater.

The features and technical effects of the embodiments disclosed herein will be presented in the description and illustration below.

10a, 10b, 10c, 10d, 10e‧‧‧oven

101‧‧‧Inner shell

102‧‧‧Outer shell

103‧‧‧Insulation

11a, 11b, 11d, 11e‧‧‧Heating chamber

12a, 12b, 12c, 12d, 12e‧‧‧Inlet end

13a, 13b, 13d‧‧‧ exhaust end

14, 14e‧‧‧Air flow channel

15, 15e‧‧‧Baffle

16a, 16b, 16c, 16d, 16e‧‧‧Circulation

17c, 17d, 17e‧‧‧ intake runner

18d, 18e‧‧‧ partition

20a, 20b, 20c, 20d, 20e ‧‧‧ heater

30a, 30b, 30d, 30e

31‧‧‧Motor

40‧‧‧Blower

Steps from S1 to S3‧‧‧ Examples

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

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

FIG. 3 is a flowchart of the step method of the present invention.

FIG. 4 is a basic architecture diagram of an oven required to implement steps S1 to S3 shown in FIG. 3.

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

FIG. 6 is a schematic diagram of the operation of FIG. 5.

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

FIG. 8 is a schematic diagram of the operation of FIG. 7.

Please refer to FIG. 3 to disclose the method for preventing the volatile ink particles from contaminating the heater in the oven provided by the present invention, which includes sequentially performing the following steps S1 to S3:

Step S1: Separate room temperature air and circulating air flow;

Referring to FIG. 4, it is illustrated that an air inlet flow path 17c is provided in the oven 10c, and the air inlet flow path 17c communicates with the air inlet end 12c, and outside ambient temperature air sequentially passes through the air inlet end 12c and the air inlet flow passage 17c. Introduced into the oven 10c, the heater 20c is arranged in the air inlet flow path 17c, so that the normal temperature air first contacts the heater 20c and then the circulating air flow 16c in the oven 10c, so that the normal temperature air cannot directly contact the circulating air flow in the oven 10c 16c, which can avoid the temperature drop of the circulating airflow 14c in the oven 10c due to direct contact with normal temperature air.

Step S2: heating normal temperature air;

Please refer to FIG. 4 again, indicating that the normal temperature air is heated by the heater 20c to become hot air before contacting the circulating air flow 16c in the oven 10c, so It is possible to avoid the temperature drop of the circulating air flow 16c. Further, the heater 20c is set in the oven 10c to heat the room temperature air, which can prevent the room temperature air from being heated outside the oven 10c to become hot air, and the heat loss phenomenon caused by the temperature drop during the introduction into the oven 10c, or the need for additional insulation Only pipes or thermal insulation flow channels can introduce hot air into the oven 10c and cause a burden on the structure of the equipment.

Step S3: contact with circulating air flow; please refer to FIG. 4 again, illustrating that the air inlet 12c forcibly guides room temperature air into the oven 10c from the outside, so that the room temperature air contacts the circulating air flow 16c through the heater 20c and enters the oven 10c with room temperature air The wind pressure generated inside prevents the circulating airflow 16c in the oven 10c from flowing backward into the intake flow path 17c and directly contacts the heater 20c, which can prevent the ink volatile particles driven by the circulating airflow 16c from contaminating the heater 20c.

On the other hand, please refer to FIGS. 5 and 6 together to illustrate the first preferred embodiment of the oven apparatus of the present invention, and to illustrate the implementation of the present invention on a tunnel oven to prevent the volatile ink particles from contaminating the heater in the oven The method can be easily implemented. The structure disclosed in FIGS. 5 and 6 includes a heating chamber 11d and an intake runner 17d in addition to the basic structure disclosed in FIG. Wherein: 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 in the implementation, the heating chamber 11d is formed in the inside Inside the casing 101. A heat insulation layer 103 with heat insulation effect is provided between the inner casing 101 and the outer casing 102. Further, the oven 10d is provided with an air inlet end 12d and an exhaust end 13d communicating with the heating chamber 11d, so that outside ambient air enters the heating chamber 11d through the air inlet end 12d, and then exhausts The end 13d leaves and generates a circulating wind flow 16d. Furthermore, a plurality of deflectors 15 are provided in the heating chamber 11d. The deflector 15 forms an air flow channel 14 in the heating chamber 11d. The air flow channel 14 is connected to the air inlet end 12d and the exhaust The gas end 13d is in communication, and the circulating air flow 16d flows along the air flow path 14 in the heating chamber 11d.

An electric heater 20d is provided in the heating chamber 11d, so that The room temperature air is heated by the heater 20d to become hot air. A wind wheel 30d is also disposed in the heating chamber 11d. The wind wheel 30d is located in the wind flow channel 14 between the air inlet end 12d and the exhaust end 13d. The wind wheel 30d is connected to a motor 31 on the upper shaft. The wind wheel 30d is rotated by the drive of the motor 31. The rotation of the wind wheel 30d can drive the hot air in the heating chamber 11d to flow along the wind flow channel 14 so that The hot air leaves the heating chamber 11d via the exhaust end 13d, and further generates a circulating air flow 16d for the baked object.

The air inlet flow path 17d is disposed between the air inlet end 12d and the heating chamber 11d, the air inlet flow passage 17d is in communication with the wind flow channel 14, and the outside normal temperature air passes through the air inlet through the air inlet end 12d The flow path 17d is introduced into the heating chamber 11d. Furthermore, the heater 20d is arranged in the intake flow path 17d, and the outside normal temperature air first contacts the heater 20d and becomes hot air before being introduced into the heating chamber 11d.

In the implementation, the intake flow path 17d is formed in the heating chamber 11d via at least one partition 18d, and the partition 18d can directly contact the circulation in the heating chamber 11d with the room temperature air at the inlet end 12d The airflow 16d can also directly contact the heater 20d with the circulating airflow 16d in the heating chamber 11d, thereby avoiding the direct contact of the circulating airflow 16d in the heating chamber 11d with normal temperature air to maintain the temperature of the circulating airflow 16d It can also prevent the volatile particles of ink driven by the circulating air current 16d from contaminating the heater 20d. Further, the air inlet 12d is provided with a blower 40. The blower 40 draws normal temperature air from the outside and is forcibly introduced into the intake flow passage 17d, so that the air pressure in the intake flow passage 17d is greater than that in the heating chamber 11d The air pressure can prevent the circulating air flow 16d in the heating chamber 11d from flowing backward into the intake flow path 17d.

In addition, please refer to FIG. 7 and FIG. 8 together to illustrate the second preferred embodiment of the oven apparatus of the present invention and the implementation of the present invention on a box-type oven. Differences between this embodiment and the first embodiment The reason is that the positions of the air inlet ends 12d and 12e of the two are different. The air inlet end 12d of the first embodiment is beside the oven 10d, and the air inlet end 12e of this embodiment is the top of the oven 10e. Both Although the inlet ends 12d and 12e are provided in different positions, the inlet air channels 17d and 17e formed by the partitions 18d and 18e can prevent the normal temperature air introduced by the inlet ends 12d and 12e from directly contacting the heating chamber The circulating wind flows 16d and 16e in the chambers 11d and 11e, and the heating chambers 11d and 11e can be configured with the wind flow channels 14 and 14e formed between the deflectors 15 and 15e to configure the wind wheels 30d and 30e to maintain the heating chamber The temperature of the circulating air flow 16d, 16e in 11d, 11e can effectively prevent the volatile particles of the ink from contaminating the heater 20d, 20e.

The above examples merely express the preferred embodiments of the present invention, but they should not be construed as limiting the patent scope of the present invention. Therefore, the present invention shall be subject to the content of the claims defined in the scope of patent application.

Steps from S1 to S3‧‧‧ Examples

Claims (8)

A method for preventing ink volatile particles from contaminating a heater in an oven includes: spacing normal temperature air introduced into one of the air inlets of the oven to eliminate direct contact between the normal temperature air and the circulating air flow in the oven, allowing the normal temperature air to pass through the heating first After the heater is heated to form hot air, it only contacts the circulating air flow in the oven; wherein, the circulating air flow flows between a heating chamber and an air flow channel in the oven, and the hot air heated by the heater And the circulating wind flow is contacted in the wind flow channel by the driving of a wind wheel in the wind flow channel, so that the wind wheel can use the wind flow channel as the wind extraction end, and the heating chamber as the air supply end. The method for preventing the volatile ink particles from contaminating the heater in the oven according to claim 1, further comprising excluding the circulating air flow in the oven from directly contacting the heater. The method for preventing the volatile ink particles from contaminating the heater in the oven according to claim 1, wherein the heater heats normal temperature air in the oven. The method for preventing the volatile particles of ink from contaminating the heater in the oven as described in claim 1, 2 or 3, wherein the air inlet forcibly guides normal temperature air into the oven from the outside. An oven device for preventing the volatile particles of ink from contaminating the heater includes a heating chamber formed in the oven, and the heating chamber communicates with an air inlet end and an exhaust end provided in the oven to enable the heating A circulating air flow for generating baked objects in the chamber; an air inlet flow channel, which is arranged between the air inlet end and the heating chamber, and the heater is arranged in the air inlet flow channel, the air inlet The flow channel guides the outside normal temperature air through the air inlet end to contact the heater to become hot air before being introduced into the heating chamber; an air flow channel is formed by at least one baffle plate spaced in the heating chamber, the inlet The air end and the exhaust end are connected through a wind flow channel, and the circulating wind flow flows along the wind flow channel in the heating chamber; wherein, a wind wheel is arranged in the wind flow channel, and the wind wheel can use the wind flow The channel serves as the wind-trapping end, and the heating chamber is used as the air-sending end, thereby driving the hot air in the intake flow channel and the heating chamber to mix to form the circulating wind flow. The intake flow channel passes through the at least one baffle to the A space is formed in the heating chamber, and the partition wall directly contacts the circulating air flow in the air flow channel with the room temperature air at the air inlet end. The oven device for preventing the volatile particles of ink from contaminating the heater as described in claim 5, wherein the partition directly contacts the heater via the circulating air flow. The oven device for preventing the volatile particles of ink from contaminating the heater according to claim 5, wherein the wind wheel is located between the air inlet end and the air outlet end. The oven device for preventing the volatile particles of ink from contaminating the heater as described in claim 5, wherein a blower is arranged at the air inlet end, and the blower extracts normal temperature air from the outside and forcibly introduces it into the intake flow path.

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