Drying and gas or vapor contact with solids – Process – Gas or vapor contact with treated material
Reexamination Certificate
2000-06-14
2002-05-28
Wilson, Pamela (Department: 3749)
Drying and gas or vapor contact with solids
Process
Gas or vapor contact with treated material
C034S504000, C034S269000, C034S278000, C034S068000
Reexamination Certificate
active
06393730
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a dryer, a dryer assembly and a drying method that are applied for drying a to-be-dried object using far infrared radiation.
BACKGROUND ART
There has conventionally been known a dryer using far infrared radiation. A far infrared radiator used in the dryer is a metal pipe whose outer surface is provided with a far infrared layer, ceramics and the like. In such a dryer, hot air that is heated by a far infrared radiator is circulated in a drying furnace. Such a hot air circulation method has generally been adopted in a drying furnace.
Especially, in a case where a to-be-dried object is a thin film board made from an epoxy resin on which acrylic resin is coated, there have arisen problems that the to-be-dried object is heated to a high temperature and as a result, the resin is burned or the board is deformed when the to-be-dried object is dried using far infrared radiation having the most suitable wavelength for the to-be-dried object. Therefore, a wavelength range of the far infrared radiation has been shifted to the longer wave side from the wavelength corresponding to the maximum absorbance and thereby, a drying time becomes longer and a quality of the product is problematic.
Besides, impurities included in the dusts, a solvent in resin and the like, generated from a to-be-dried object in a drying process, is mixed into hot air. When the hot air containing such materials is circulated in a drying furnace, the materials attach to resist on a print board and cause inconveniences on the drying process. For example, minute sized impurities in the hot air stick to the surface of the resist, which produce a cause for electric short in the wiring. On the other hand, harmful gases and the like generated in a drying process of resin or the like are released into the atmosphere from the drying furnace, which exerts an adverse influence on the environment.
The present invention has been made in order to solve the above problems and can irradiate a to-be-dried object with far infrared radiation having an optimal wavelength in an effective and efficient manner. It is accordingly an object of the present invention to provide a dryer and a drying method that can reduce a time to be required for drying without deformation of a to-be-dried object regardless of a kind and a thickness of the to-be-dried object and can thereby achieve an excellent dried state.
It is another object to provide a dryer and a drying method in which only clean hot air is supplied in a manner such that neither of impurities in dusts, solvent in resin and the like generated from a to-be-dried object in a drying process reaches a surface of a print board or the like, and thereby, drying of precision parts can be effected in a good yield, and in addition, in which special consideration is given to environment so that neither of harmful gas or the like generated in a drying process of resin or the like is released into the air from the drying furnace.
The disclosure of the invention
A dryer comprises:
a far infrared radiator that emits far infrared radiation optimal for drying a to-be-dried object;
a drying chamber in which far infrared radiation emitted by the far infrared radiator is directed to the to-be-dried object to dry the to-be-dried object;
a plenum chamber for preparing a downflow of hot air toward the drying chamber;
a frame to which a plurality of the far infrared radiators are mounted and which is provided with an opening for jetting the hot air that flows down from the plenum chamber toward the drying chamber;
an elevating device for varying a distance between the to-be-dried object and the far infrared radiators;
a hot air closed circulation path for circulating the hot air that is heated up by heat generated from the far infrared radiators; and
a control device for controlling a temperature in the drying chamber, an irradiation time of far infrared radiation, a surface temperature of the far infrared radiator and a distance between the far infrared radiator and the to-be-dried object.
A dryer comprises:
a far infrared radiator that emits far infrared radiation optimal for drying a to-be-dried object;
a drying chamber in which far infrared radiation emitted by the far infrared radiator is directed to the to-be-dried object to dry the to-be-dried object;
a plenum chamber for preparing a downflow of hot air toward the drying chamber;
a frame to which a plurality of the far infrared radiators are mounted and which is provided with an opening for jetting the hot air that flows down from the plenum chamber toward the drying chamber;
an elevating device for moving the plenum chamber and the plurality of far infrared radiators, as one body, upward or downward;
a hot air closed circulation path for circulating the hot air that is heated up by heat generated from the far infrared radiators; and
a control device for controlling a temperature in the drying chamber, an irradiation time of far infrared radiation, a surface temperature of the far infrared radiator and a distance between the far infrared radiator and the to-be-dried object.
A dryer comprises:
a far infrared radiator that emits far infrared radiation optimal for drying a to-be-dried object;
a drying chamber in which far infrared radiation emitted by the far infrared radiator is directed to the to-be-dried object to dry the to-be-dried object;
a plenum chamber for preparing a downflow of hot air toward the drying chamber;
an enclosure for enclosing the plenum chamber and the far infrared radiator;
a frame to which a plurality of the far infrared radiators are mounted and which is provided with an opening for jetting the hot air that flows down from the plenum chamber toward the drying chamber;
an elevating device for varying a distance between the to-be-dried object and the far infrared radiators;
a hot air closed circulation path for circulating the hot air that is heated up by heat generated from the far infrared radiator; and
a control device for controlling a temperature in the drying chamber, an irradiation time of far infrared radiation, a surface temperature of the far infrared radiator and a distance between the far infrared radiator and the to-be-dried object.
A dryer comprises:
a far infrared radiator that emits far infrared radiation optimal for drying a to-be-dried object;
a drying chamber in which far infrared radiation emitted by the far infrared radiator is directed to the to-be-dried object to dry the to-be-dried object;
a reflecting plate disposed on one side of the to-be-dried object and an insulating material disposed on the other side, wherein the reflecting plate is opposed to the far infrared radiator;
an elevating device for varying a distance between the to-be-dried object and the far infrared radiators;
a first exhaust duct for discharging a gasified solvent or the like from the to-be-dried object in the drying chamber to the atmosphere;
a second exhaust duct for discharging hot air that circulates in the drying chamber;
a hot air closed circulation path for circulating the hot air that is heated up by heat generated from the far infrared radiator; and
a control device for controlling a temperature in the drying chamber, an irradiation time of far infrared radiation, a surface temperature of the far infrared radiator and a distance between the far infrared radiator and the to-be-dried object.
In the dryer,the far infrared radiator includes: a far infrared radiation layer provided on a surface of a curved metal plate; a heating device for heating the metal plate; and a holding/shaping plate for holding the metal plate in a curved shape and/or making the metal plate assume a curved shape.
In the dryer, the hot air closed circulation path is a closed path through which the hot air circulates from the drying chamber through the plenum chamber again to the drying chamber.
The dryer,further comprises a gas molecule decomposition device that is provided in the hot air closed circulation path for cleaning the hot air that flows down from the plenum chamber.
In the dryer,the gas molecule decom
Armstrong Westerman & Hattori, LLP
Daito Seiki Co., Ltd.
Wilson Pamela
LandOfFree
Drier, drier assembly and drying method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Drier, drier assembly and drying method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Drier, drier assembly and drying method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2838242