Material heating apparatus
First Claim
1. In an apparatus for heating and maintaining an asphalt material in a molten state at temperatures within a preselected range below the decomposition temperature of the asphalt material,a container for holding an amount of the asphalt material in its molten state,infrared heating means for emitting infrared radiation at a first temperature above the asphalt material decomposition temperature, said heating means being spaced from a portion of the wall of the container such that the emitted infrared radiation is directed at said container wall portion,and heat absorbing means relatively spaced from said infrared heating means and said container wall portion and interposed therebetween to receive infrared radiation emitted by the heating means to prevent the emitted radiation from impinging directly upon the container wall, said heat absorbing means being heated to a second temperature less than said first temperature and greater than the preselected temperature range by absorption of the infrared radiation impinging thereon and emitting secondary radiation at said second temperature onto said container wall portion,the relative spacings between said heating means and absorbing means and said absorbing means and container wall portion being so selected as to cause the secondary radiation to impinge upon said container wall portion at a third temperature less than said second temperature and within the preselected range so as to maintain the temperature of the asphalt material in contact with the container wall portion within the preselected range below the decomposition temperature of the asphalt material, said heat absorbing means being inperforate and being between said heating means and container wall so as to intercept the infrared radiation emitted by said heating means to prevent the same from impinging directly upon said container wall and to convert the heat of sad infrared radiation to a lower heat intensity by absorbing certain of said heat of said heating means and to serve as a selective regulating control of the heat acting upon said container wall.
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Accused Products
Abstract
A container for maintaining molten material at an elevated temperature below the decomposition temperature of the material is heated utilizing a relatively high temperature infrared source by interposing a heat absorbing means relatively spaced between the heat source and the container for absorbing the infrared radiation from the source and for transmitting secondary radiation at a substantially reduced temperature onto the container skin.
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Citations
17 Claims
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1. In an apparatus for heating and maintaining an asphalt material in a molten state at temperatures within a preselected range below the decomposition temperature of the asphalt material,
a container for holding an amount of the asphalt material in its molten state, infrared heating means for emitting infrared radiation at a first temperature above the asphalt material decomposition temperature, said heating means being spaced from a portion of the wall of the container such that the emitted infrared radiation is directed at said container wall portion, and heat absorbing means relatively spaced from said infrared heating means and said container wall portion and interposed therebetween to receive infrared radiation emitted by the heating means to prevent the emitted radiation from impinging directly upon the container wall, said heat absorbing means being heated to a second temperature less than said first temperature and greater than the preselected temperature range by absorption of the infrared radiation impinging thereon and emitting secondary radiation at said second temperature onto said container wall portion, the relative spacings between said heating means and absorbing means and said absorbing means and container wall portion being so selected as to cause the secondary radiation to impinge upon said container wall portion at a third temperature less than said second temperature and within the preselected range so as to maintain the temperature of the asphalt material in contact with the container wall portion within the preselected range below the decomposition temperature of the asphalt material, said heat absorbing means being inperforate and being between said heating means and container wall so as to intercept the infrared radiation emitted by said heating means to prevent the same from impinging directly upon said container wall and to convert the heat of sad infrared radiation to a lower heat intensity by absorbing certain of said heat of said heating means and to serve as a selective regulating control of the heat acting upon said container wall.
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8. In an apparatus for maintaining a flowable material substantially at a preselected temperature,
a vessel for holding the material, infrared heating means spaced from the vessel for emitting infrared radiation at a first temperature greater than the preselected temperature, and absorber means relatively spaced from said vessel and heating means and interposed therebetween for intercepting the infrared radiation emitted by the heating means so as to substantially prevent impingement of the infrared radiation directly upon said vessel, said absorber means being heated by the intercepted infrared radiation and emitting secondary radiation onto said vessel for heating the same to the preselected temperature to enable a conductive transfer of heat from the vessel to the material therein sufficient to maintain the material substantially at the preselected temperature, said heat absorbing means being imperforate and being between said heating means and container wall so as to intercept the infrared radiation emitted by said heating means to prevent the same from impinging directly upon said container wall and to convert the heat of said infrared radiation to a lower heat intensity by absorbing certain of said heat of said heating means and to serve as a selective regulating control of the heat acting upon said container wall.
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16. In an apparatus for heating a container from a high temperature source of heat and for maintaining the temperature of the container at a substantially constant preselected temperature less than the temperature of the heat source,
a heater for emitting infrared radiation at a temperature in the range of 1500° - to 1700°
F. and preferably approximately 1600°
F.,a container to be heated substantially to a temperature of approximately 450°
F.,an absorber of a thickness selected in the range of 0.06 to 0.375 inches and preferably 0.125 inches interposed between said heater and container for intercepting the infrared radiation emitted by said heater to prevent the direct impingement of the infrared radiation upon said container and for heating said absorber to a temperature substantially in the range of 650°
to 700°
F. by absorption of the infrared radiation so as to cause said absorber to emit secondary radiation onto said container, said absorber being spaced from said heater to a selected distance of 3 to 6 inches and preferably 4 to 5 inches and spaced from said container to a selected distance of 0.5 to 2 inches and preferably 0.75 to 1.25 inches, said heat absorbing means being imperforate and being between said heating means and container wall so as to intercept the infrared radiation emitted by said heating means to prevent the same from impinging directly upon said container wall and to convert the heat of said infrared radiation to a lower heat intensity by absorbing certain of said heat of said heating means and to serve as a selective regulating control of the heat acting upon said container wall,and thermostatic means on said container for sensing the temperature of the container and connected with said heater to control the operation thereof, said thermostatic means being spaced from the area of impingement of the second radiation thereon a distance selected in the range of 2 to 8 inches.
- to 1700°
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17. In an apparatus for heating a body from a heat source emitting infrared radiation at a first temperature wherein it is desired to maintain the body substantially at and no higher than a second temperature less than the first temperature, the heat source being spaced from the body a fixed distance such that the temperature of the infrared radiation is sufficiently reduced in traversing the fixed distance to cause its impingement on the body at a temperature no higher than the second temperature, means for controllably increasing the temperature loss of the emitted infrared radiation in traversing the fixed distance without increasing the fixed distance comprising:
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absorbing and transmitting means interposed between the heat source and the body for absorbing the infrared radiation emitted by the source so as to prevent the infrared radiation from impinging directly upon the body, said means being heated to a third temperature less than the first temperature and greater than the second temperature, and for emitting secondary radiation at the third temperature onto the body to heat the same to the second temperature, said absorbing and transmitting means being relatively spaced from the heat source and the body by amounts so selected as to provide a predetermined heat loss between the heat source and the body, the predetermined heat loss being greater than that normally occurring over the fixed distance when the emitted infrared radiation at the first temperature is permitted to impinge directly upon the body, said heat absorbing means being imperforate and being between said heating means and container wall so as to intercept the infrared radiation emitted by said heating means to prevent the same from impinging directly upon said container wall and to convert the heat of said infrared radiation to a lower heat intensity by absorbing certain of said heat of said heating means and to serve as a selective regulating control of the heat acting upon said container wall.
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Specification