JPS61258050A - Drying method on machine - 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] (Industrial Application Field) The present invention relates to a water jet loom (hereinafter abbreviated as W, J, L).
This invention relates to an on-machine drying method for weaving using.

(Conventional technology) There has been remarkable progress in weaving technology using W, J, L, and results such as speeding up, generalization, automation, etc. are steadily being obtained, but W, J, L, There are many unresolved technical issues regarding the drying of gray fabric, which is essential for weaving.

Gray cloth woven using W, J, and L inevitably contains a lot of water, so it is generally dried while keeping the width of the gray cloth constant, and there are no preparations for long-term storage of the gray cloth, including anti-mold measures. must not.

Drying methods for this greige include drying by drying the greige in a separate process after weaving the greige, and drying by blowing hot air using a far-infrared heater or exhaust air from a spinning machine blower immediately before winding up the loom into cross rolls on the loom. At present, two methods are mainstream: the so-called on-machine drying method, such as hot air blowing using a heat source, and a combination of these methods is also used.

However, the inventors have discovered that although all of these drying methods are reasonably effective, they have very serious deficiencies as they are.

In other words, in the conventional system9, for example, in the case of the on-loom drying method, the degree of dryness varies greatly from loom to loom, and at the same time, even on the same loom, when observed over time, the degree of dryness varies greatly, and it is difficult to maintain uniform dryness. No gray fabric was obtained. That is, in the past, a dryer was simply attached to a loom, and there was no effective means for controlling the degree of drying.

In addition, the greige drying method, which dries in the post-process, involves separate processes and greige looms with different moisture contents woven from individual looms are dried under the same conditions.

This method cannot be said to be a sufficient method because it has fundamental problems such as excessive drying, which wastes thermal energy, or conversely, results in undrying, making it impossible to achieve the intended purpose.

Moreover, it can be said that almost the same problem exists in the combined use of on-machine drying and gray machine drying in the subsequent process.

That is, in any case, the conventional greige drying method has problems in both processing cost and quality, which remain unsolved.

(Problems to be Solved by the Invention) The present invention is based on an on-machine drying method, and aims to save heat energy, reduce processing costs, and reliably obtain gray fabric with uniform dryness and a uniform moisture content. That is.

In other words, it is possible to suppress fluctuations in the dryness of gray fabric between machines during on-machine drying and fluctuations in the dryness of gray fabric due to aging within the machine, and at the same time, it is possible to easily obtain a dryness suitable for the gray fabric in progress, thereby eliminating unnecessary The present invention provides an on-machine drying method that does not use thermal energy and is advantageous in terms of processing costs. In addition, uniform drying reduces fluctuations in the gray fabric, making it easier to dye the fabric in subsequent steps.

(Means for Solving the Problems) The present invention provides the following advantages when performing gray drying using far infrared rays, hot air, or warm air blowing at any position between the press roll and the cross roll in W, J, and L.
After drying the greige, the moisture content of the greige was measured using a two-color infrared moisture meter.

A control device is provided which uses the measured value as an electric signal to dry the drying device so that the measured moisture content matches a preset moisture content.

A detailed explanation will be given below with reference to one drawing.

Figure 1 shows the installation location of the detection element of the two-color infrared moisture meter according to the present invention. After the adhering water droplets are sucked by the slit (2), they are passed through a press roll (3), a clothes winding roll (4), and then rolled up onto a cross roll (5).

The on-machine dryer (6) and the detection element (7 or 7゛) of the two-color infrared moisture meter are installed between the press roll (3) and the cross roll (5), and the former (6) is attached to the latter ( 7 or 7′) is closer to the press roll (3), and the latter (7 or 7°) is closer to the cross roll (5) than the former (6).
) and attach it. The detection element (7 or 7") of the two-color infrared moisture meter is installed directly facing the surface of the gray fabric.

In this case, the gray material part to be detected may be directly opposed to the cross roll by the detection element as shown in (7).

Alternatively, it may be the part before being rolled up by the cross roll, as shown in (7゛).

FIG. 2 shows a principle diagram of a two-color infrared moisture meter used in the present invention. Two-color infrared moisture measurement involves irradiating a sample with infrared rays and measuring moisture based on the water absorption spectrum in the near-infrared region, but errors are likely to occur due to changes in sample distance and reflectance changes on the sample surface. In order to exclude these effects, we applied only two types of light to the sample: infrared light with a wavelength that is not absorbed by water, and infrared light with a wavelength of 1.94 μm that shows absorption by water, and calculated the energy ratio of the reflected light. Moisture is measured by determining the amount of water.

For the two-color infrared moisture meter, use the lens (J) in Figure 2.
It consists of a light source (L) with a , a motor (M) with sectors (S+, SZ), 3 reflectors (Ml), a concave mirror (0+z) that serves as a focusing system, a transmission filter (F), and a photoelectric element (D). It is measured as follows.

The light emitted from the light source (L) is the lens CI! The sector (S, ) is focused by the sector (S) and rotated by the motor (M).

S,), only the wavelengths absorbed by water and the comparison wavelengths that are not absorbed by water are transmitted, and the light is projected onto the gray material (1), which is the object to be measured, by the reflecting mirror (Ml). . Part of the light having a wavelength that is absorbed by water is absorbed by the moisture of the object to be measured, and the rest is scattered. On the other hand, light having a comparative wavelength that is not absorbed by water is not absorbed by the object to be measured and is diffusely reflected.

These two lights are condensed by a concave mirror (M2), passed through an infrared transmission filter (F), and sent to a photoelectric element (D) as an electrical signal (
E).

Figure 3 shows a flowchart of electrical signals. In the figure, the electrical signal from the two-color infrared moisture meter (7) is converted into an input pulse of light having a comparison wavelength by the next electronic circuit (8). The input pulse of light having a wavelength absorbed by water is separated, held by a signal synchronized with the sector rotation, and the energy ratio between the two is sent to the next control circuit (9) as an electric signal representing the water content.

The control circuit (9) controls the heat source by generating an output signal that instructs the heat source to increase or decrease its output so that a preset moisture content is achieved.

Therefore, in the present invention, the on-machine dryer and its control method are not limited, but dryers that directly use electricity, such as far-infrared heaters or electric heaters, are easier to control. These dryers are preferred because they have advantages such as reliable operation and low cost.

(Function) That is, according to the present invention, a two-color infrared moisture meter is adopted as the most suitable method for measuring the moisture content of gray fabric, and the moisture content of the gray fabric is detected non-contact and with high accuracy, and the measured moisture content is measured. The output of the heat source is controlled by an automatic control circuit using the electric signal converted from the moisture content, so that the moisture content of the gray fabric always remains constant as specified.

(Example) An embodiment of the present invention will be shown below.

(1) Loom used -, J, L, L - 41 type 2 revolutions 450 times/
minutes, 3 machines (2) Structural material of gray fabric: polyester, weaving structure: bonzi, warp near 5 denier/36 filament, 82 threads/2501+11.
Weft near 5 denier/36 filaments, 75 pieces/25
mm, width: 135ca+ (target), length: 531
II/Hiki.

(3) On-machine dryer A variable output (maximum 600 W) far-infrared dryer was installed as shown in Figure 1.

(4) Two-color infrared moisture measuring needle and control circuit - The detection element was mounted directly against the cross roll as shown by the solid line in Figure 1.

■The optical system including the detection element used the principle shown in Figure 2.

■The relationship between the moisture content of Ponzi and its infrared absorption wavelength was determined in advance, and the control circuit was set to maintain a predetermined moisture content, thereby controlling the output of the far-infrared dryer.

(5) Predetermined moisture content Based on past results, the moisture content is 3±1% without any problems.
It was set to

In the conventional method as a comparative example, weaving was carried out using the same loom as in the example with the same gray fabric structure, and the output of the far-infrared dryer was kept unchanged at 300 W without using a control circuit.

The moisture content and the results in the gray fabric when weaving under the above conditions are shown in Table 1.

As shown in Table 1 (Table 1), in the present invention, the variation in moisture content between machines and within the machine is within ±0.5%, and the variation in the moisture content in the gray machine, which is linked to moisture fluctuations, is within 1.5 cm. The fluctuation is within the range of .

On the other hand, in the conventional method, the moisture content between machines and within the machine shows fluctuations exceeding the set values, which are 5% or more, and fluctuations of up to 5 cm are observed in the gray machine. Since the moisture content of these products exceeded the set value, greige drying was required in the subsequent process.

(Effects of the Invention) As described above, the present invention employs a two-color infrared moisture meter as the most suitable device for measuring the moisture content of gray fabric in the on-machine drying method, and can automatically control the moisture content of gray fabric as specified. Since a certain level of greige can be stably obtained even in the greige, there is no need to dry the greige in the post-process, and it is also highly effective in saving labor and reducing processing costs.

[Brief explanation of drawings]

FIG. 1 shows the passing paths of W, J, and L gray fabrics, and is a layout diagram showing the relationship between the one-machine dryer and the detection element of the two-color infrared moisture meter. FIG. 2 is a diagram showing the principle of the optical system of the two-color infrared moisture meter used in the present invention. FIG. 3 shows a control system for controlling the moisture content. 1-grey machine, 2-suction slit, 3...-press roll,
4-clothing roll, 5-cross roll, 6-on-machine dryer,
7 or 7°-detection element, 8...-electronic circuit 9--control circuit, Torlens, L-light source, M--Motorani+Sl and S2--sector, MI--reflector. M8 - Concave mirror that serves as a condensing system, F - Transmission filter. D--one photoelectric element, E-electrical signal.

Claims (1)

[Claims] When drying the gray fabric using far infrared rays, hot air, or hot air blowing at any position from the press roll to the cross roll in a water jet loom, the fabric after drying is checked using a two-color infrared moisture meter. The measured moisture content is converted into an electrical signal, and the output of far-infrared rays or the volume of hot air or hot air, which serves as a drying heat source, is applied so that the measured moisture content matches the preset moisture content.
An on-machine drying method characterized by drying by controlling temperature, etc.