JPH0339510Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention involves transporting a workpiece made of a fiber aggregate, etc. mixed with heat-fusible fibers, using a conveyor, and moving the workpiece from the surface of the workpiece to the conveyor. This is a heating device for passing hot air to the non-conveying side of the product to heat-treat the object to obtain a product such as a nonwoven fabric. In order to improve stability, this invention relates to an improvement that prevents the occurrence of heating unevenness such as thermal fusion unevenness at the edge of the product.

[Prior Art] Incidentally, in order to obtain a product with stable quality and no heating unevenness, it is necessary to ensure that the velocity distribution and temperature distribution of the hot air passing through the object to be treated are uniform throughout.

Conventionally, as a heating device for uniformizing the wind velocity distribution of hot air passing through the object to be processed,
There is something related to No. 94660. That is, as shown in FIG. 5, this heating device is arranged between a reversing roll 12, which stretches an endless conveyor 14 having air permeability, and a drive reversing drum 13, along the conveyance direction of the conveyor 14. The heating chamber 21 is provided with divided heating chambers 21, 21, . That is, each heating chamber 21 is connected to the carrier 1 as shown in FIG.
The hot air supply chamber 22 formed above the conveying surface of the conveyor 14 and the hot air suction chamber 23 formed below the non-conveying surface of the conveyor 14 are vertically divided, and a discharge port 23a and a circulation fan 24 are opened to the hot air suction chamber 23. suction port 24a
are connected via a damper 25, and the pressure chamber 24b of the circulation fan 24 and the supply port 22e of the hot air supply chamber 22 are connected via a heat exchanger 26.
The configuration is such that hot air at an appropriate temperature passes through the carrier 14 from above to below. The hot air supply chamber 22
In this case, substantially the entire surface facing the conveying surface of the conveying body 14 is a hot air discharge area 22b, and a rectifying partition wall 27 is provided between the hot air discharge area 22b and an upper hot air inflow area 22c. . The rectifying partition wall 27 includes a perforated plate 27a having a perforated area approximately the same as the hot air discharge area 22b, which is arranged approximately parallel to the carrier 14, and has air permeability so as to cover the entire perforated area. The fiber assembly layer 27b is connected to the perforated plate 27a.
It is configured by placing it on top of. The fiber assembly layer 27
b consists of one or a plurality of sheets to be treated made of heat-resistant fibers such as polyester fibers. The seal plates 22f and 22g forming both sides of the hot air discharge area 22b have their lower edges hanging down to a position approaching the carrier 14, so that the cold air from the outside of the hot air supply chamber 22 is passed through the carrier 14. It is constructed so that it does not leak into the hot air suction chamber 23. In the hot air suction chamber 23, a hot air suction area 23b is formed at a position opposite to the hot air discharge area 22b via the carrier 14, and between the hot air suction area 23b and a lower hot air discharge area 23c. A rectifying partition wall 28 is disposed at. The rectifying partition wall 28 has a perforated plate 28a having a perforated area approximately the same as the hot air suction area 23b, which is arranged approximately parallel to the carrier 14, and has air permeability so as to cover the entire perforated area. The fiber assembly layer 28b is placed on a perforated plate 28a.

The circulating air generated by the circulation fan 24 reaches a set temperature (for example,
120 to 150° C.) and is supplied to the hot air inflow region 22c of the hot air supply chamber 22. The hot air inflow chamber 22
The hot air supplied to c is rectified while passing through the rectifying partition wall 27, and is delivered to the object 1 on the conveyor 14 as hot air at an appropriate wind speed (for example, 0.5 to 1.2 m/sec) from the hot air discharge area 22b. (For example, a fiber aggregate made of a mixture of heat-fusible fibers) is discharged with a uniform air velocity distribution. The discharged hot air passes through the object to be processed 1 and the conveyor 14 and enters the hot air suction chamber 23.
The hot air is sucked into the hot air suction area 23b.

[Problems to be solved by the present invention] However, the heating device for the air-permeable workpiece,
There are the following problems.

(a) A part of the hot air supplied to the hot air inflow region 22c is as shown by the white arrows A and A' in FIG.
While flowing down along the heat retaining wall 21a and the seal plate 22f, a part of the heat retained by the hot air is transferred to the heat retaining wall 2.
1a and the seal plate 22f and flows out to the outside R, it is supplied to the edge portion 1a of the workpiece 1 in a state where the temperature has decreased, for example, by about 2 to 3°C. As a result, in the conventional heating device, the edge portion 1a of the workpiece 1 is insufficiently heated, so that the resulting product 1' (see Fig. 5) is insufficiently heated (for example, when the product 1' is a nonwoven fabric, It was necessary to cut off the edge of the ear (insufficient fusion), resulting in a very poor yield.

(b) As a measure to avoid supplying hot air with a reduced temperature to the edge of the object 1, move the edge of the object 1 to position B on the inside of the conveyor 14. It is conceivable that hot air with a reduced temperature is passed through a region C on the conveyor 14 where the object to be processed 1 is not placed, so that the hot air with a reduced temperature does not come into contact with the edge portion 1a' of the object to be processed 1. . However, the workpiece 14 on the conveyor 14
Since the hot air passage resistance is very low in the region C where the hot air is not placed, the hot air supplied near the edge 1a' of the workpiece 1, as shown by the white arrow D in FIG. is forcibly sucked at high wind speed. Therefore, the edge of the object 1 becomes overheated by the hot air at high velocity (that is, the hot air with a large heat transfer ability). Therefore, with this measure, it is necessary to cut off the overheated edge of the obtained product, and it is not a fundamental solution.

[Means for Solving the Problems] The present invention which solves the above-mentioned problems consists of an endless conveyor body having air permeability, a hot air supply chamber formed on the conveyance surface side of the conveyor body, and a non-conveyance unit of the conveyor body. It is equipped with a hot air suction chamber formed on the surface side, and while a breathable workpiece is transported by the transport body, hot air is passed from the surface of the workpiece to the non-transfer side of the transport body, and the workpiece is In the heating device for heat-processing, the conveying body has a non-conveying area near the edge end over the entire conveying direction, an effective conveying area inward from the non-conveying area, and the hot air supply chamber has a By partitioning the room with a partition plate whose long edge is close to the boundary between the non-conveyance area and the effective conveyance area of the body, a secondary hot air supply area leading to the non-conveyance area of the conveyance body and the effective conveyance area of the conveyance body can be separated. The main hot air supply area is divided into two areas.

[Function] In the present invention, since the partition plate is heated by the hot air flowing in the secondary hot air supply area, the temperature of the hot air flowing along the partition plate in the main hot air supply area is prevented from decreasing, and the hot air flowing in the main hot air supply area is heated. temperature distribution becomes uniform.

[Description of Embodiments] Hereinafter, a heating device for a breathable workpiece according to the present invention (hereinafter referred to as "the device of the present invention") will be described based on an embodiment shown in the drawings.

(First Embodiment) FIG. 1 shows the main part of the first embodiment of the present device. The main improvement in this embodiment is that the area near the edge of the conveyance body 14 is made into a non-conveyance area 14a with a width dimension W ₁ (for example, W ₁ =50 to 100 mm) over the entire conveyance direction, and the area inside the non-conveyance area 14a is The other side is defined as the effective transport area 14b, and the transport body 14
The lower long edge 2a of the partition plate 2 extending in the conveyance direction is brought close to the boundary 14c between the non-conveyance area 14a and the effective conveyance area 14b, so that the interior of the hot air supply chamber 22 is Sub-hot air supply area G leading to the conveyance area 14a and effective conveyance area 14b of the conveyor 14
The main hot air supply area F is divided into two areas.

The entire partition plate 2 or at least the heat insulation wall 2
It is preferable to use a plate having low thermal conductivity and poor heat transfer (for example, a heat insulating material sandwiched between stainless steel plates) for the upper half 2d facing 1a. The lower long edge 2a of the partition plate 2 is formed by the edge of a seal plate 2b whose height is adjustable. A hot air inlet portion 22g is formed between the upper long edge 2c of the partition plate 2 and the ceiling heat retaining wall 21b. The secondary hot air supply area G includes the perforated plate 2 of the rectifying partition wall 27.
It can be partitioned into two upper and lower chambers using an air volume regulator such as an extension 27a' of 7a or a damper (not shown), or it can be formed into one chamber without providing an air volume regulator. The main hot air supply area F has a rectifying partition wall 2 as in the conventional case.
7 into an upper hot air inflow area 22c and a lower hot air discharge area 22b.

The hot air suction chamber 23 is located at the boundary 1 of the carrier 14.
4c, the upper long edge 3a of the partition plate 3 extending in the conveyance direction is brought close to the back surface side portion corresponding to 4c, and the inside of the hot air suction chamber 23 is
The hot air suction area I is divided into a secondary hot air suction area I, which communicates with the main hot air suction area I, and a main hot air suction area H, which communicates with the effective conveyance area 14b of the conveyor 14. The secondary hot air suction area I is connected to the main hot air suction area H via an air volume regulator such as a damper 4 installed at a suitable location such as the lower end.
It is connected to. The main hot air suction area H is connected to the upper hot air suction area 2 by the rectifying partition wall 28, as in the conventional case.
3b and a lower hot air outflow area 23c. Note that the inside of the hot air suction chamber 23 is designated as a sub hot air suction area I.
The workpiece 1 is divided into the main hot air suction area H and
When there is a large change in the hot air passage resistance due to a change in the specifications of
This is to prevent hot air from leaking in the gap between the lower long edge 2a of the partition plate 2 and the conveyor 14, and to ensure uniform heating of the object 1 to be processed. Therefore, if there is no major change in the hot air passage resistance of the workpiece 1, the rectifying partition wall 27, which is not shown, divides the sub hot air supply area G of the hot air supply chamber 22 into upper and lower halves.
If a fiber aggregate layer is placed on top of the fiber aggregate layer 27b with a total resistance value of the hot air passage resistance value of the fiber aggregate layer 27b and the hot air passage resistance value of the object 1, the hot air suction chamber 23 can be Of course, the structure may be the same as the conventional structure shown in FIG. 6 without being divided into the main hot air suction area H and the main hot air suction area H.

Next, the behavior of hot air in the first example will be explained. A part of the hot air supplied into the hot air supply chamber 22 is distributed to the sub hot air supply area G, and the remainder is distributed to the main hot air supply area F. While the hot air distributed in the secondary hot air supply area G flows downward, a part of the heat retained in the hot air flows out to the outside R through the heat insulation wall 21a and the seal plate 22f, and the temperature increases. 2
The air passes through the non-conveying area 14a of the conveying body 14 in a state where the temperature has decreased by about 3° C. and is sucked into the secondary hot air suction area I of the hot air suction chamber 23. On the other hand, the hot air distributed to the main hot air supply area G is rectified while passing through the rectifying partition wall 27, and is sent to the carrier 14 as hot air at an appropriate wind speed (for example, 0.5 to 1.2 m/sec) from the hot air discharge area 22b. The air is discharged onto the object to be processed 1 (for example, a fiber aggregate mixed with heat-fusible fibers) with a uniform air velocity distribution, and passes through the object to be processed 1 and the effective conveyance area 14b of the conveyor 14 to enter the hot air suction chamber 23. The hot air is sucked into the hot air suction area 23b, passes through the rectifying partition wall 28, and enters the hot air exhaust area 2.
This leads to 3c. The secondary hot air supply area G and the main hot air supply area F are separated by a partition plate 2 having a long edge 2a close to the boundary 14c between the non-conveying area 14a and the effective conveying area 14b of the conveying body 14. , the hot air flowing through both regions never mixes before passing through the non-conveying region 14a or the effective conveying region 14b of the conveyor 14. Furthermore, since the partition plate 2 is heated to a high temperature by the hot air flowing through the secondary hot air supply area G, the temperature drop of the hot air flowing along the partition plate 2 within the main hot air supply area F is very small. Therefore,
The hot air flowing in the main hot air supply area F has a uniform temperature distribution over the entire width direction (direction transverse to the transport direction) of the effective transport area 14b of the transport body 14. As a result, hot air passes through the workpiece 1 with a uniform temperature distribution and a uniform wind speed distribution over the entire widthwise area.

(Second Embodiment) FIGS. 2 to 4 show a second embodiment of the present device. The device 30 of the present invention includes a conveying body 34 made of a rotatable drum, and a hot air supply chamber 41 that covers the outer peripheral area of the conveying body 34 except for a region below the conveying body for carrying in and out of the heated object.

As shown in FIG. 4, the features of the present device 30 include a non-conveyance area 34a having a width W ₂ (for example, W ₂ =50 to 100 mm) over the entire conveyance direction near the edge of the conveyance body 34; The area inward from the non-conveying area 34a is defined as an effective conveying area 34b, and furthermore, the conveying body 34
The lower long edge 42a of the partition plate 42 extending in the circumferential direction of the conveyor 34 is brought close to the boundary part 34c between the non-conveyance area 34a and the effective conveyance area 34b. Non-conveying area 3 of body 34
4a and a main hot air supply area M that communicates with the effective conveyance area 34b of the conveyor 34.

The conveyor 34 has a cylindrical portion 35 made of stainless steel or the like, and has a surface aperture ratio of 70% or more and an outer diameter.
It has a diameter of about 500 to 1500 mm and is formed from a honeycomb-like porous curved body. Outer peripheral surface 34 of carrier 34
A wire net 36 made of stainless steel or the like is wound around the outer periphery of the cylindrical portion 35. As shown in FIGS. 2 and 3, inside the conveyor 34, a fixed drum 31 having a perforated curved rectifying plate 31a and a seal plate 31b in the circumferential direction is attached to a fixed shaft 3.
2, and the cylindrical part 35 and the fixed drum 3
1 in the circumferential direction of the conveyor 35
It is divided into a seal area K and a seal area K. Fixed drum 31
The outer peripheral ends 33a, 33a of the curved partition plates 33, 33 disposed at both ends of the curved rectifying plate 31a are brought close to the back surfaces of the boundary parts 34c, 34c of the conveying body 34, and the inner circumference of the conveying body 34 is conveyed. It is divided into sub hot air suction areas Q, Q which communicate with the non-conveyance areas 34a, 34a of the body 34, and a main hot air suction area P which communicates with the effective conveyance area 34b of the conveyance body 34. Each sub-hot air suction area Q is
It communicates with the main hot air suction area P via a curved air volume adjustment plate 37 that is movably connected to the inner circumferential portion of the curved partition plate 33 . The fixed drum 31 has an opening side 31c that is connected to the side opening 34h of the carrier 34.
It is connected to the suction port 43a of the hot air circulation device 43 (the circulation fan and the heat exchanger are not shown) through the The hot air suction area 34d is in a predetermined negative pressure state (for example, -30 to -100 mm
water column).

The hot air supply chamber 41 provided on the outer peripheral side of the conveyor 34 is provided with a curved nozzle plate 44 having holes or slits formed therein, and curved partition plates 42, 42 are provided at both ends of the nozzle plate 44. It is joined.
As shown in FIG. 4, the partition plate 42 is made of a plate with low thermal conductivity and poor heat transfer, and the inner peripheral edge 42
a is formed by the edge of the seal plate 42b whose height is adjustable. Outer peripheral edge 42c of partition plate 42
A hot air inlet portion 41g is provided between the heat insulating wall 42b and the
is formed. Partition plate 42 and side heat insulation wall 41
Although not shown in the drawings, the secondary hot air supply area N formed between the hot air supply area N and the hot air supply area N may be divided into two upper and lower chambers using an air volume regulator such as a perforated plate. The main hot air supply area M formed between the left and right partition plates 42, 42 is connected to the nozzle plate 44.
It is divided into an outer hot air inflow region 41c and an inner hot air discharge region 41d. In the hot air supply chamber 41, a hot air supply port 41c is opened in the ceiling of the heat retaining wall 41b, and hot air at an appropriate temperature is supplied from the hot air circulation device 43.

Next, the behavior of hot air in the second embodiment will be explained. A part of the hot air supplied into the hot air supply chamber 41 is distributed to the sub hot air supply area N, and the remainder is distributed to the main hot air supply area M. While the hot air distributed in the secondary hot air supply area N flows toward the outer circumferential surface 34e of the carrier 34, the heat retained in the hot air is taken away by the heat insulation wall 41a, and the temperature is lowered by, for example, about 2 to 3 degrees Celsius. The carrier 34 passes through the non-transport area 34a of the carrier 34.
The hot air is sucked into the secondary hot air suction Q formed inside the .
On the other hand, the hot air distributed to the main hot air supply area M is rectified while passing through the nozzle plate 44, and is adjusted at an appropriate wind speed (for example, 0.5 to 1.2 m/sec) from the hot air discharge area 41d.
The hot air is discharged to the object 1 to be processed (for example, a fiber aggregate mixed with heat-sealable fibers) on the conveyor 34 with a uniform air velocity distribution, and the object 1 and the object 34 to be treated are
It passes through the cylindrical portion 35 and the wire net 36 and is sucked into the hot air suction area 34d inside the conveyor 34, passes through the curved baffle plate 31a of the fixed drum 31, and reaches the main hot air suction area P. The sub hot air supply area N and the main hot air supply area M in the hot air supply chamber 41 are
Since the non-conveyance area 34a of 4 and the effective conveyance area 34b are partitioned by a partition plate 42 with an inner peripheral edge 42a close to the boundary 34c, the hot air flowing through both areas N and M is The hot air is never mixed before passing through the conveying area 34a or the effective conveying area 34b. Furthermore, since the partition plate 42 is heated to a high temperature by the hot air flowing through the secondary hot air supply area N, the temperature drop of the hot air flowing along the partition plate 42 in the main hot air supply area M is very small. Therefore, hot air with a uniform temperature distribution passes through the object 1 over the entire width direction (direction transverse to the conveyance direction).

[Effects of the present invention] As described in detail above, the heating device for the workpiece according to the present invention prevents the temperature of the hot air flowing along the partition plate within the main hot air supply area from decreasing. The temperature distribution of the hot air flowing through becomes uniform over the entire width direction (direction transverse to the conveying direction), which has the practical effect of making it possible to obtain products with stable quality without uneven heating.

[Brief explanation of drawings]

1 to 4 show an embodiment of a heating device for a permeable workpiece according to the present invention, in which FIG. 1 is a front sectional view showing the main parts of the first embodiment, and FIG. The figure is a front sectional view of the second embodiment, FIG. 3 is a side sectional view taken along the - line in FIG. 7 to 7 show a conventional heating device, FIG. 5 is a side view with the middle part omitted and partially cut away, FIG. 6 is an enlarged view cut along the line -- in FIG.
FIG. 7 is an enlarged perspective view showing the arrangement of the rectifying partition wall. 1...Product to be processed, 1'...Product, 14, 34...
...Conveyance body, 14a, 34a...Non-conveyance area, 14
b, 34b...effective conveyance area, 14c, 34c...
... Boundary part, 22, 41 ... Hot air supply room, 2, 42
...Partition plate, D, M...Main hot air supply area, E, N...
...Secondary hot air supply area.

Claims (1)

[Scope of utility model registration request] It is equipped with an endless conveyor having air permeability, a hot air supply chamber formed on the conveying surface side of the conveyor, and a hot air suction chamber formed on the non-transferring surface side of the conveyor. In a heating device that heats the workpiece by passing hot air from the surface of the workpiece to the non-conveyance side of the transport body while transporting the workpiece with a transport body, the transport body has an end portion near the edge thereof extending over the entire area in the transport direction. A non-conveying area extends over the area, and an area inward from the non-conveying area is an effective conveying area, and the hot air supply chamber has a long edge close to a boundary between the non-conveying area and the effective conveying area of the conveying body. The air-permeable object to be processed is characterized in that the room is partitioned with a partition plate to divide the room into a sub-hot air supply area that communicates with the non-conveyance area of the conveyance body and a main hot-air supply area that communicates with the effective conveyance area of the conveyance body. heating device.