JPS635816Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an apparatus for baking a resin coated onto the surface of a substrate such as a lens for the purpose of improving surface hardness, weather resistance, or antifogging properties.

In general, plastic or glass substrate surfaces such as eyeglass lenses, optical mechanical lenses, prisms, mirrors, etc. are protected from scratches and are blocked from direct sunlight.
To prevent fogging, various resin liquids such as polyvinyl alcohol are applied to the surface of the substrate, and this is dried and baked to form a film on the surface of the substrate that has anti-fogging effects. I'm trying to form it.

Conventionally, apparatuses shown in FIGS. 1 and 2 have been used to perform such printing.

The apparatus shown in FIG. 1 is a batch type, in which a cage 3 is disposed inside a furnace 1 and rotates horizontally while storing an object 2 such as a lens, and a cage 3 is installed on both sides of the furnace 1. One of the openings 4 and 5 is closed by a supply section 9 equipped with a heater 8 connected to a blow-off duct 7 of a circulation fan 6, and the other is closed by a discharge section 1 connected to a return duct 10. The air from the circulation fan 6 is heated by the heater 8, enters the furnace 1 through the filter 12 fitted in the opening 4, and dries and bakes the resin liquid on the surface of the workpiece 2. ing.

When using such a batch type printing device,
It is necessary to open the door and take out the workpiece 2 for each treatment, and each time outside air enters the furnace, making the temperature inside the furnace uneven. Therefore, a good quality film cannot be formed.

Further, FIG. 2 shows a continuous type baking device, in which a furnace 21 is provided inside the device main body 20, and this furnace 2
A cage 23 in which a workpiece 22 is housed is provided movably by a chain belt 24, and the furnace 2
A blowout duct 26 from a circulation fan 25 is connected to the lower part of the return duct 27, and a filter 28 is provided at the inlet of the return duct 27, and a heater 29 is provided above the filter 28. Therefore, heater 2
The air heated by 9 is sent into the furnace 21 by the circulation pump 25 and the workpiece 2 in the cage 23 is
After the resin liquid on the two surfaces is dried and baked, it is discharged from the upper part of the furnace 21, heated again by the heater 29, and sent into the furnace by the circulation fan 25.

In a system like this device that blows hot air from below, when the device is stopped, the saturated vapor of the coating liquid that has adhered to the inner wall of the furnace solidifies, and the next time the device is started up, There is a disadvantage that the coagulated material is blown up in the form of fine powder and adheres to the surface of the object to be processed, resulting in a decrease in yield.
Further, since the filter 28 is not provided near the object to be treated, dust and the like in the duct tend to adhere to the surface of the object to be treated.

The present invention was developed to improve the shortcomings of the conventional equipment described above, and its purpose is to make it possible to uniformize the temperature inside the furnace and to bake a high-quality anti-fog film on the surface of the workpiece, and also to prevent baking. It is an object of the present invention to provide a printing device that can prevent dust and the like from sometimes adhering to the surface of a processed object as much as possible.

In order to achieve such an objective, the present invention involves baking a workpiece in which a resin liquid such as polyvinyl alcohol is coated on the surface of a base material such as glass or plastic in a furnace that blows hot air from the top to the bottom. In the apparatus, a first high-performance filter is disposed in the upper part of the furnace, and a cage for storing a workpiece that is movable in the vicinity of the first high-performance filter is provided below the first high-performance filter; The inner wall of the furnace below the processing object storage cage is hung in a funnel shape to form a funnel-shaped hanging part, and a hot air return duct and a part of the hot air are discharged from a narrow diameter part of the funnel-shaped hanging part. A discharge duct is extended outside the furnace, the return duct and a hot air blow-off duct extended outside the furnace from above the first high-performance filter are connected via a heating section, and the return duct is branched. and a circulation fan that mixes the air from the fresh air supply duct with the hot air from the return duct and sends it to the heating section. is disposed between the return duct and the heating section.

An example of the implementation of the present invention will be described in detail below with reference to FIGS. 3 and 4.

FIG. 3 is a longitudinal side view schematically showing the baking device according to the present invention, and FIG. 4 is a partially cutaway front view of a two-barrel baking furnace.

In the figure, numeral 31 is a baking furnace, and inside this baking furnace 31 is attached a cage 33 that moves laterally by a chain belt 32, and inside this cage 33, a resin liquid is applied to the surface of an eyeglass lens, etc. The object to be processed 34 is housed therein.

A high-performance filter 35, which is a first high-performance filter, is removably installed directly above the portion through which the cage 33 passes. The performance of this high performance filter 35 is, for example, class 100 or below, that is, the number of particles of 0.3 μm or below in one cubic foot is 100 or below. Furthermore, the high-performance filter 35 also has a rectification function, so that the hot air blown onto the object to be treated is directed directly downward, and by placing the high-performance filter 35 as close to the object 34 as possible, the hot air is directed away from the furnace wall, etc. Prevents peeled fine dust from adhering to the object to be treated.

In addition, a monitoring window 36 is formed on the side wall of the baking furnace 31, an opening 38 is formed in the upper part to connect with a blowout duct 37 that forms a part of the hot air circulation circuit, and a funnel-shaped hanging part 39 at the lower part of the baking furnace 31 is formed on the side wall. An opening 41 connected to a return duct 40 and an opening 43 connected to a discharge duct 42, which form part of the circulation circuit, are formed in the opening 41, respectively. A duct 44 for supplying fresh air from the outside is connected to the middle part of the return duct 40, and the fresh air is sucked in by a fan 45, which is a blower fan, and then passed through a high-performance filter 46, which is a second high-performance filter. This air mixture is sent to a heating section 49 equipped with a heater 48 by a circulation fan 47, and is heated to a predetermined temperature in this heating section 49. Hot air is sent to the upper part of the baking furnace 31 through a blow-off duct 37 extending from the upper end. Therefore, circulation fan 47,
A hot air circulation circuit is formed by the heating section 49, the blow-off duct 37, the baking furnace 31, and the return duct 40.

Further, a resistor 50 for measuring the temperature of hot air is removably installed directly below the high-performance filter 35 of the baking furnace 31, and a damper 51 for adjusting the air volume is installed in the exhaust duct 42, return duct 40, and fresh air supply duct 44. ...is installed.

In the above, for example, in the case of a two-barrel type printing apparatus as shown in FIG. It is transported through the installed baking furnaces 31, 31. In this case, the speed of hot air in the first baking furnace is slowed down to suppress the temperature drop accompanying volatilization of the resin liquid. And cage 3
3 moves through the baking furnace, the object to be processed 34 is uniformly heated and the surface of the object to be processed is coated with a resin film.

As is clear from the above description, according to the present invention, in an apparatus for baking an object coated with a resin liquid on the surface of a glass substrate, hot air flows downward from the top of the baking furnace, and A high-performance filter that removes dust and other particles is placed directly above and close to the object to be processed, and the bottom of the furnace is shaped like a funnel to ensure smooth flow of hot air.
It has many advantages such as being able to heat evenly without fine particles adhering to the surface of the object to be treated, such as being able to bake extremely high-quality coatings onto the surface of plastic or glass substrates. . Because the circulating hot air is mixed with clean air from outside, it has high thermal efficiency, and the drying efficiency of the processed material decreases due to an increase in the concentration of volatile matter from the processed material in the hot air supplied to the furnace. This prevents the burn-in from occurring, thereby providing high seizure efficiency.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention and a conventional example, and FIGS. 1 and 2 are schematic diagrams of a conventional printing device, FIG. 3 is a longitudinal cross-sectional side view of the printing device according to the present invention, and FIG. 4 is a schematic diagram of a conventional printing device. 1 is a front view of a printing device according to the present invention. In addition, in the drawing, 31...Furnace, 33...Cage, 3
4...Product to be processed, 35...High performance filter, 37
...Blowout duct, 40...Return duct, 44...
...New air supply duct, 47...Circulation fan, 49...
...This is a heating section.

Claims (1)

[Scope of Claim for Utility Model Registration] An apparatus for baking a workpiece in which a resin liquid is applied to the surface of an optical element base material made of glass or plastic in a furnace that blows hot air from the top to the bottom, A first high-performance filter is disposed in the upper part of the interior, and a cage for storing a workpiece is provided below the first high-performance filter in close proximity to the first high-performance filter. The inner wall of the furnace below the storage cage is hung in a funnel shape to form a funnel-shaped hanging part, and a hot air return duct and a discharge duct for discharging a part of the hot air are provided from the narrow diameter part of the funnel-shaped hanging part. The return duct is connected to a hot air blowing duct extending outside the furnace from above the first high-performance filter through a heating section, and the return duct is branched to a second hot air blowing duct extending outside the furnace. A fresh air supply duct that takes in outside air through a high-performance filter and a blower fan is provided, and a circulation fan that mixes the air from the fresh air supply duct with the hot air from the return duct and sends it to the heating section is installed in the return duct. A printing device characterized in that it is disposed between a duct and the heating section.