JPS5849885A - Continuous heating and dehydrating device for cloth, etc. through microwave heating - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention The present invention takes advantage of the fact that in microwave heating, the entire heating element generates heat at the same time, and the temperature distribution of the heating element is such that the inner layer is at a high temperature. When the temperature is raised by microwave heating with a small number of plates, etc. closely attached to each other, and when the temperature reaches the vaporization temperature, the internal pressure increases due to the volume expansion, and vaporized steam is generated in the atmospheric pressure area outside of the closely attached plates. Spouting begins, and in this case, unvaporized water content in the spouting line fabric is also pushed out as a liquid with this jetting.

Conventionally, this is the fifth place for thick woven fabrics such as cotton, wool, and synthetic fibers, and it is known that the process of pulling and heating and drying them is slow and low in efficiency.

The microwave heating dehydration device according to the present invention is installed immediately after the outlet of the above-mentioned drawing process, performs preheating and dehydration, and supplies the water content to approximately 100% to the heating drying device.・It is possible to improve heating efficiency.

May you be omniscient! It is difficult to uniformly heat a heated object having a wide area such as a cloth by Iku P-wave heating due to the short wavelength of microwaves and the generation of constant pressure waves. (The condition is abbreviated as pressure welding part)
If the heated area is heated at least, even if the temperature of the heated area rises unevenly, the partially vaporized part will undergo vapor diffusion toward the unvaporized part due to the increase in internal pressure, and the heating due to the steam temperature will also cause the part to become unvaporized. The evaporation portion decreases and the evaporation portion rapidly expands. That is, in the present invention, while the water content distribution is heated at the pressure welding part, the water content in the unvaporized and evaporated part is discharged as a liquid by increasing the internal pressure due to vaporization of a small part of the water content. Compared to evaporative drying using wave heating, dehydration is much more uniform and efficient.

The present invention will be explained in detail below using examples.

In Figure 1 B) and (B), the fabric material has a moisture content of 200~
At 300%, it enters from the inlet radio wave shield part 5a of the bottom surface 4-4 of the microphone solar wave heating chamber 4 (hereinafter abbreviated as cavity) and is pressed between the roll 6 and the endless belt 8 hooked on the four-rule 7.7. The roll 6 and the endless bell) 8Fi are driven around, press the fabric, move upward, release this state at the upper part, and open the exit radio wave shield part 5b of the ceiling surface 4-1 of the fabric person Fi and Nakayabite 44. Then exit to the top. A radio wave emission port 2 is provided on the side surface 4-5 of the cavity 4, and a waveguide 2' is connected to the microwave oscillator lK# via the isolator 3 to the cavity 4, entrance and exit radio wave shield @51sb
hIt shall have a known structure. Roll 6 and Roll 7.7'
The body part 6-1 (7-
1,7'-1) and shaft part 6-2 (7-2,7'
-2) has a two-piece structure, and the shaft part 6-2 (7-2, 7'
-2) penetrates the side plates 4-2 and 4-3 of the cavity 44 at their respective placement positions with a radio wave leak prevention structure to be described later, is supported by a bearing (enclosure) attached to the main body frame part 9, and is driven. 11 (corral) and is driven. The outer circumference of the roll 6's body 11S6-10 is! 1/4 of the wavelength of mital radio waves, such as white rubber, natural rubber, silicone rubber, etc., which have low power absorption, heat resistance, chemical resistance, and necessary mechanical strength.
The outer layer 6-4 wound with half the thickness above is provided, and the fabric i1 is removed from the metal bottom surface of the body 56-1, thereby reducing the heating effect caused by radio wave reflection on the metal surface and the damage caused in the fabric width direction. Prevents uniform heating and effectively irradiates the fabric with microwave heating electric field. Also, Figure 2+ is 4-R6
0 In another embodiment, a plurality of metal arms 6-3 are provided radially at both ends of the body 6-1, and the tip portions 6-3 are mainly made of silicon FRP and glass base fabric, and p is determined based on mechanical strength. do)
Fixed with Porto 6-5.

The silicone FRP and 7a-glass material are used for the same purpose as the outer layer wrapping rubber of the roll 6, and differ only in hardness and mechanical strength.

Figure 3 0)←)tl shows an example of the radio wave seal structure of the cavity side plate penetration part of each shaft of roll 6.7 (75). Axis 6-2
The hole 12m that fits with the mounting hole 12b overlaps with the mounting tap hole 12b. The shaft penetrating portion of the cavity side 4-2. 12 mounting holes (or long mounting holes for shaft position l1lliI) 4-2b, 4-3
bt- opened and like the same figure (a)-? Kibitei side plate 4
-2.4-3, the shaft hole '12a of the short-circuiting plate 12 is brought into close contact with the cavity side plate in static alignment with the shaft 6-2.7-2.7'-2, and fixed with screws 12C. 7. The flange 13 is made of 8U8 material, and the inner diameter of the cylinder is about 5 lQmm from the shaft diameter.
The tube length is set to 1/2 of the wavelength of the four waves of the microphone, and it is installed inside the shorting plate 12. Therefore, the roll axis 6-2.7-
2. Both ends of 7'-2 are electrically short-circuited to the shaft hole 12 & of the short circuit plate 12 before passing through the cavity side plate, and the 7 flange 13 prevents potential generation at the short-circuited part of the joint, so that the shaft part can prevent radio wave leakage.

Endless belt 8 rolls 60! Made of the same material as the rubber material with 11A, etc. As shown in Figure 4, there are ears 58-1t on both ends.
The cross-sectional shape of the tube is provided, and the ear ends 8-1 are made of fabric and the ends of both ears are made to be shielded tubes.

The main body skeleton is made of 9 metals and has 4 cavities! Side plates 9-2 and 9-8- parallel to the cavity side plates 4-2, 4-3 are attached to the base plate 9-1 at the bottom of the i-plate 4-5 to form a single body, supporting the cavity 44O and supporting the roll 6. .7°7' bearing (not shown) is designated as p.

The hot air blowing section 10 is attached to the upper fabric exit side of the exit radio wave shield section 5b, and blows hot air of about 100° C. diagonally upward onto both sides of the fabric to prevent dew condensation on the fabric surface. The drain plate 11 is made of a Teflon plate or the like that absorbs little microwave power, and is placed in the cavity 4 above the inlet radio wave shield part 5a. Widen it to the width of 51 and install it. A large number of small holes 4-51- are opened in the cavity bottom 114-4 under the condition that there is no leakage of radio waves, and the dewatered water flowing down along the fabric surface is removed from the fabric surface, and the water is allowed to flow outside the cavity while avoiding the entrance radio wave shield. Let it drain.

In the above configuration, as the fabric advances upward from the surface of the cavity 40, its temperature rises and enters the pressure welding of the endless rule belt 8, and as the temperature rise approaches the vaporization temperature [K, steam generation begins. The rise causes vapor diffusion to the low temperature area,
By accelerating the temperature rise in the low-temperature part, the part where vaporization and internal pressure increase rapidly expands and covers the entire width of the cloth.The subsequent press-contact part is filled with vaporized steam and the internal pressure is high until the roll 6 and endless belt 8 separate. state. Therefore, the microwave supply power is adjusted according to the mass of the fabric, the water content, and the traveling speed j[K, and the position where the internal pressure increases due to vaporization during the fabric eating is set to a position close to the inlet of the pressure welding part. When set, the direction of diffusion and ejection of vaporized vapor is concentrated on the inlet side of the pressure welding part, and there are many low temperature parts below the unvaporized temperature in this part, and it is discharged downward as a liquid.

As we all know, radio waves in the microwave frequency band have short wavelengths and are constant pressure waves, so it is difficult to uniformly raise the temperature of a wide heating surface such as a cloth. Even if the temperature rises unevenly in each part of the fabric area, which allows a small number of plates etc. to be closely attached, the temperature will rise quickly to the vaporization temperature in the nine parts, and the internal pressure will be high tp. Due to diffusion, the temperature of the unvaporized portion tends to rise rapidly (steam heating is added to the microphone four-wave heating).

Therefore, as the internal pressure increases due to vaporization and the vapor diffuses and escapes, unvaporized moisture is discharged as a liquid, so it has the advantage of being more efficient than the conventional drying method using heating and evaporation.

Note that the degree of pressure welding of the fabric by the roll 6 and the endless bell (8) is different from the pressure applied by a conventional drawing mangle device, and the pressure welding surface is in close contact with the fabric, and the internal pressure due to steam generation is about tens to hundreds of millimeters of water column pressure. used. For fabrics with low hydrophobicity, such as cotton, it is preferable to apply pressure a little more strongly than wool or synthetic fibers to increase the degree of adhesion.

Experimental Example 1 Fig. 5 A cavity-type microwave heating device (frequency 2450 MHz) using Kosei fabric made by Watamott Co., Ltd.

2500W to output 0) 4C This is a comparison of the heating dehydration method of the present invention and the conventional evaporation drying method, and the sample has a basis weight of 1'
Og/m2*13.5X20c with thickness 6.5mm
mi (cut, the pressure contact part of the present invention method is white silicone PR)
A backing plate (2 mm thick) with the same dimensions as the P sample and a holding plate IX2 x 15 cm were formed into a set of 2 using P plate material, and three sets were screwed together so that the backing plate was in close contact with the sample.The sample contained moisture. After molding with a pressing plate, the plate was held in close contact with the molding plate at a pressure of about 200%, and after being held vertically until the moisture stopped dripping, the initial moisture content was measured.

The sample surface in the cavity was set horizontally in the evaporative drying method and vertically in the method of the present invention. As for the heating efficiency, the sample absorbed power was calculated assuming that the entire amount of weight loss before and after heating was evaporated. The calculation formula is as follows: Q = ((W□・Δt-c)+Δt (Wl-W□)
+539 (Wl-W2))Xiσ3P = Rare, 24
X/60. TxQ dar /PtX1% The symbols in the formula are as follows: Q: Sample absorbed calorie kcalW
o: Weight of bone-dry sample gWl: Weight of water-containing sample immediately before heating gW2: Weight of water-containing sample immediately before heating gΔt: Temperature rise f 10
0°C - room temperature 0CC customer sample specific heat
Absorbed power of 0.3Pi sample kW T: Heating time min η
:Heating efficiency %Pl:Supplied microwave power kW The figure shows the experimental results with heating efficiency on the subordinate axis and sample and stacking number on the horizontal axis'. The present invention method of curve ■ is Y10 from the number of stacked sheets of 4 sheets.
0%, and in the evaporative drying method of curve I, when the number of stacked sheets is 6, 'i' is 70%.

Curve C is calculated by assuming that the heating heat amount of the sample pressure welding material used in the experiment of the present invention method of curve ① is based on a mass of 500 g, a specific heat of 0.3°, and the heating temperature is 70% of the sample temperature, and is added to the absorbed calories of the sample. shows. Curve 2 in the figure shows the heating efficiency relationship that can be calculated in the same way as the curve 0 when the number of stacked samples is constant at 6 using the method of the present invention and the supplied power is varied. The initial moisture content in the above experiments was 170 to 180%.

This experiment shows that the heating efficiency of the method of the present invention is much higher than that of the conventional method, and is twice as high as the conventional method to 1.5.

Experimental Example 2 In Figure 6 U) and (B), the relationship between the fraction of cotton and wool fabrics with different hydrophobic properties and the weight of water discharged was investigated.

Figure 0) uses the same sample as the sample of No. 5, and stacks a6
&, ills 3"/In'-supply J&t power 1000 W,
and 14 dots A, thickness 7m/r1m, power supply 2
000W, and the minor axis shows the water content and the weight of drained water, and the horizontal axis shows the heating time. Curve I is 6 layers, curve L is 1 layer
Moisture content of 4 layers, 6 layers for curved soda, 14 for curve ■
The relationship between the drained weight of stacked sheets and the elapsed heating time is shown.

The same experiment as in Figure 5 was carried out using a wool rosette fabric with a fabric weight of 470 mm, 2 thicknesses, 0.8 //fr1, 6 sheets stacked, 4.9 mm thickness, and power supply IQOOW.
And stacked sheets A12 sheets thickness g, 6mm supply power 2000
Experiment with WK, good. Curve I is 6 sheets stacked, music arrangement 1
The moisture content and heating time of the two-ply layer, the length of the curve is 6 (0) in the same figure, and (b) the moisture content of cotton and wool is 1.1, respectively.
As shown, the moisture content increases rapidly from around 30 seconds after heating, and reaches 100% in 90 seconds from 60 to 60. Also, the drainage weight is also different for each curve.

As shown in (2), y increases rapidly from 30 seconds directly after heating, becomes constant when the moisture content is around 100% for cotton, and increases in proportion to the heating time even when the moisture content is around 70% for highly hydrophobic wool. Show that.

[Brief explanation of the drawing]

FIG. 1(a) is a front external view of an embodiment of the present invention, with four
The wheels 6, 7, 7', their bearings, and drive parts are omitted. It is shown in a vertical cross-sectional view (b) of the cross-section along the line x-X' in the figure. Figure 2 (A), (B), and (C) are Figure 1-) Glue 6
, 7.7 is a cross-sectional view showing the structure of roll 6.
A subordinate sectional view and a front view of different structural examples (in the same figure) are shown in the same figure f →
An enlarged view of the inside of the chain line is shown. Figure 3 (a) -) (c) is the roll 6.7 of Figure 1 (b)
．． Fig. 4 is a cross-sectional view of the endless belt 8, Fig. 6 is a comparison experiment between the dewatering method of the present invention and the conventional method, Fig. 6 (()←) shows experimental results on cotton and wool using the method of the present invention. 4: Microwave heating jii 5a: Inlet radio wave shield 5b: Outlet radio wave shield 6: Roll 8: Endless belt A; Fabric patent applicant Morning 1) Yoshio

Claims (2)

[Claims] (1) Continuously press both sides and both ends of a water-containing fabric etc. with a belt etc. with low microwave loss to form a close contact part! The temperature is raised by four-wave heating, and the internal pressure of the adhering part is increased by the vaporized vapor of a part of the water-containing part, while the remaining unvaporized moisture is discharged as a liquid to the outside of the adhering part. Features: Continuous heating and dehydration equipment for fabrics. (2) The close contact part has a structure in which an endless belt made of rubber or the like with low microwave loss is brought into pressure contact with the outer periphery of the outer layer winding roll made of rubber material with low microwave loss, and is driven together with the belt. A continuous heating and dehydrating apparatus for fabrics, etc. according to claim 1, which transports fabrics while sealing both sides and both edge ends.