CN100395541C - Novel sizing moisture regain detecting system - Google Patents

Abstract

The present invention relates to the technical field of the water content measurement of textile products, particularly to a novel sizing moisture regain detecting system. The present invention comprises a microwave transmitting device which is not contacted with the sizing to be detected and a microwave receiving device, wherein electric signals collected by a data collecting card are converted into digital signals which are input in a computer, and the sizing moisture regain is calculated by the dielectric loss value detected by the devices. The system mainly solves technical problem that the existing detecting device can not realize that a sample is detected on line and a measuring head is in contact with the sample, and can obtain precise measurement results.

Description

A kind of sizing moisture regain detecting system

Technical field:

The present invention relates to textile product moisture measurement technical field, particularly a kind of novel sizing moisture regain detecting system.

Background technology:

At present, the national standard method of measuring sized warp moisture regain is an Oven Method, oven drying method has stable accurate, the simple advantage of surveying instrument of measurement result, but each sample quantities of measuring is few, specimen length has certain limitation, and when test drying time longer, so Oven Method can't realize online detection.

Therefore, comparatively Cheng Shu regain electrical measurement means are electric-resistivity method, and electric-resistivity method has that principle is simple, the simple advantage of apparatus structure, and these have all satisfied the requirement of on-line measurement.But the resistance measurement head need contact sample, and the precision of measurement is not high.

China's utility model patent instructions (Granted publication number: CN2393096Y) disclose a kind of cotton regain measurement mechanism of surveying instrument, it is characterized in that: it comprises central processing unit, sample circuit, analog to digital conversion circuit, display circuit, keyboard scanning circuit, the mouth line of described central processing unit connects display circuit, the mouth line of described central processing unit connects keyboard scanning circuit, the mouth line of described central processing unit connects analog to digital conversion circuit, described analog to digital conversion circuit is connected with sample circuit, described sample circuit be sampling end IN with power supply ground between cross-over connection capacitor C in parallel 7 and resistance R 11 are arranged.It can convert the cotton water percentage of input to the standard aqueous rate according to program by central processing unit, saved table look-up, process that conversion etc. is complicated, measuring speed is fast.Its measuring method mainly is by placing the cotton sample between two pole plates, apply high voltage on two pole plates, measuring the water cut of cotton by measuring two conductances between the pole plate.Said apparatus also can't be avoided determinand contact pole plate, the accuracy that influence is measured fully.

Summary of the invention:

The purpose of this invention is to provide a kind of novel sizing moisture regain detecting system, solve existing pick-up unit and can't realize that online detection contacts the technical matters of sample with measuring head, can obtain more accurate measurement result.

For solving the problems of the technologies described above, the present invention is achieved in that

A kind of sizing moisture regain detecting system, it is characterized in that: it includes the not microwave launcher and the microwave receiving device of contact measured sizing, import computing machine by changing into digital signal behind the data collecting card collection electric signal, and calculate sized warp moisture regain by the dielectric loss value that said apparatus records; The measurement model of this system is:

$a=\frac{1}{\tan {\mathrm{\δ}}_w}\sqrt{\frac{-{\mathrm{\ϵ}}_{s}K\tan {\mathrm{\δ}}_w\±K\sqrt{{\left({\mathrm{\ϵ}}_s\tan {\mathrm{\δ}}_w\right)}^2+4K({\mathrm{\ϵ}}_w-{\mathrm{\ϵ}}_s)\tan {\mathrm{\δ}}_w}}{2{\mathrm{\ϵ}}_w({\mathrm{\ϵ}}_w-{\mathrm{\ϵ}}_s)}}$

Wherein, wherein α refers to that water accounts for the volumetric concentration of entire belt liquid sizing, and ε refers to specific inductive capacity, and tan δ refers to dielectric loss, and w represents the dielectric index of water, and s represents the dielectric index of slurry and yarn, and K is a measurement index

$W=\frac{a}{{\mathrm{\ρ}}_y(1-a)}\×100\%$

Volume density p according to yarn _y, can be transformed into regain again from the volumetric concentration of water.

This microwave launcher comprises successively the signal source that connects, coaxial/waveguide switch, coaxial attenuator and emitting antenna, this microwave receiving device comprise connect successively accept antenna, microwave current detector, frequency-selecting amplifier and data collecting card.

The digital signal about dielectric loss that this computing machine will be gathered is carried out the computing of sized warp moisture regain in conjunction with the parameters such as dielectric index in the computer data storehouse.

Parameters such as dielectric index in this computer data storehouse are imported by input equipment.

By technique scheme, the present invention has following advantage:

1, the present invention only has water that microwave is produced strong attenuation owing to being with in the liquid sizing, so this method is not subjected to the influence of formula of size composition.

2, Statistics Application principle of the present invention, under identical test condition and test raw material, this system sized warp moisture regain that records and the sized warp moisture regain that application national standard method one Oven Method records are compared, and relative error only is 0.18%, does not have marked difference.

3, not only measurement result is accurate in system of the present invention, and contact measured object not, can calculate measurement result fast.In microwave radiation field, band liquid sizing can pass through continuously, and the Usage data collection card is gathered the minimum time-delay of measurement result can reach 8 delicate, satisfies the needs of online detection fully.

4, the employed instrument of system of the present invention is the simplest microwave component, and is with low cost, good stability.Service routine according to this model is simple to operate, objective interface, and those skilled in the art all can directly use.

Description of drawings:

Fig. 1 is the structural representation of novel sizing moisture regain detecting system of the present invention.

Fig. 2 is the testing process figure of novel sizing moisture regain detecting system of the present invention.

Embodiment:

See also Fig. 1, it is the structural representation of a kind of novel sizing moisture regain detecting system of the present invention.As shown in the figure: it includes the not microwave launcher and the microwave receiving device of contact measured sizing.This microwave launcher comprises successively the signal source that connects, coaxial/waveguide switch, coaxial attenuator and emitting antenna, this microwave receiving device comprise connect successively accept antenna, microwave current detector, frequency-selecting amplifier and data collecting card.Import computing machine by changing into digital signal behind the data collecting card collection electric signal, and calculate sized warp moisture regain by the dielectric loss value that said apparatus records.Testing process of the present invention as shown in Figure 2.

The damping capacity of microwave energy can solve the problem of online detection after using the measurement sizing by microwave radiation field.Sizing is when the microwave radiation field, and microwave launcher and receiving device be contact measured sizing not; Because water has strong absorption for microwave energy, the accuracy height of measurement; Microwave oscillation frequency height, for the reacting condition sensitivity of moisture, than short-movie disconnected in the variation of moisture also can be measured come out, above advantage all makes by measuring the online sized warp moisture regain of measuring of microwave attenuation amount becomes possibility.

According to the definition of sized warp moisture regain, when the volume density of yarn is known, can directly obtain sized warp moisture regain by the content of moisture in the yarn.The blending agent that band liquid sizing is made up of slurry, yarn and water, slurry commonly used and yarn all belong to superpolymer, and Jie under microwave frequency puts loss and almost can ignore.And moisture has strong absorption characteristic for microwave, when band liquid sizing passes through microwave radiation field, and the damping capacity that how much has directly determined microwave energy of the moisture in the sizing.Microwave power reduce just and loss specific inductive capacity and dielectric loss tangent angle between certain contact is arranged.On the basis of having considered the various polarization of band liquid sizing, by a large amount of verification experimental verifications, this method has been set up the model that concerns between new calculating complex media dielectric property that is adapted to yarn commonly used and the detection of slurry regain and the moisture.This model is as follows:

$a=\frac{1}{\tan {\mathrm{\δ}}_w}\sqrt{\frac{-{\mathrm{\ϵ}}_{s}K\tan {\mathrm{\δ}}_w\±K\sqrt{{\left({\mathrm{\ϵ}}_s\tan {\mathrm{\δ}}_w\right)}^2+4K({\mathrm{\ϵ}}_w-{\mathrm{\ϵ}}_s)\tan {\mathrm{\δ}}_w}}{2{\mathrm{\ϵ}}_w({\mathrm{\ϵ}}_w-{\mathrm{\ϵ}}_s)}}$

Wherein a refers to that water accounts for the volumetric concentration of entire belt liquid sizing, and ε refers to specific inductive capacity, and tan δ refers to dielectric loss.W represents the dielectric index of water, and s represents the dielectric index of slurry and yarn.K is a measurement index.

$W=\frac{a}{{\mathrm{\ρ}}_y(1-a)}\×100\%$

Volume density p according to yarn _y, can be transformed into regain again from the volumetric concentration of water.

This model had both considered not take place the comprehensive dielectric property calculating of interlayer polarization part medium, had also considered the comprehensive dielectric property calculating that interlayer polarization part medium takes place.Find through calculating that simultaneously the two dimension dielectric model is identical with the yarn moisture that measurements of the chest, waist and hips dimension dielectric model draws when all interfaces of medium all produce the interlayer polarization.The interface that in fact the interlayer polarization takes place is just a part of, two-dimensional parallel composite dielectric model moisture that draws and the moisture that the dielectric model of having considered the interlayer polarization draws are carried out the numeral variation, drawn the model that being applicable to that sized warp moisture regain detects in the weaving production.

According to new model, this measuring system has been used LabVIEW language compilation utility routine, program interface are regain real time data windows very intuitively, can select the yarn variety of surveying, measurement number of times and sample frequency voluntarily.Native system has also utilized the standard microwave component to make up the decrement measurement unit in addition, by changing into digital signal input computing machine behind the data collecting card collection electric signal, uses utility routine and can carry out online regain detection.

The warp sizing machine that present embodiment uses is the JSSJ-83 type warp sizing machine of Donghua University's development, and microwave attenuation flowmeter device is produced by the U.S. submicro wave in Shanghai instrument plant.Signal source frequency is the 9370MHz dot frequency, coaxial transmission line characteristic impedance 50 Ω, and the electromagnetic horn gain is 17dB.

Practical measuring examples is as follows:

Measurement scheme	Quality Pure Cotton Yarn Production (18tex)	Polyester T/C 70/30
			Scheme 1	Converted starch 80% PVA 20%
Scheme 2		Converted starch 40% PVA 60%
			Scheme 3		Converted starch 60% PVA 40%

Measurement data

Cooperate above-mentioned slurries, concentration is 10%, and following data are numerical value in the 10m segment:

Measurement scheme	Average value measured	?CV(％)
			Scheme 1	?7.99	?6.90
Scheme 2	?2.22	?11.48
			Scheme 3	?2.27	?14.89

Being preferred embodiment of the present invention only in sum, is not to be used for limiting practical range of the present invention.Be that all equivalences of doing according to the content of the present patent application claim change and modification, all should be technology category of the present invention.

Claims (4)

1. sizing moisture regain detecting system, it is characterized in that: it includes the not microwave launcher and the microwave receiving device of contact measured sizing, import computing machine by changing into digital signal behind the data collecting card collection electric signal, and calculate sized warp moisture regain by the dielectric loss value that said apparatus records; The measurement model of this system is:

$a=\frac{1}{\tan {\mathrm{\δ}}_w}\sqrt{\frac{-{\mathrm{\ϵ}}_{s}K\tan {\mathrm{\δ}}_w\±K\sqrt{{\left({\mathrm{\ϵ}}_s\tan {\mathrm{\δ}}_w\right)}^2+4K({\mathrm{\ϵ}}_w-{\mathrm{\ϵ}}_s)\tan {\mathrm{\δ}}_w}}{2{\mathrm{\ϵ}}_w({\mathrm{\ϵ}}_w-{\mathrm{\ϵ}}_s)}}$

Wherein, wherein α refers to that water accounts for the volumetric concentration of entire belt liquid sizing, and ε refers to specific inductive capacity, and tan δ refers to dielectric loss, _wRepresent the dielectric index of water, _sRepresent the dielectric index of slurry and yarn, K is a measurement index

$W=\frac{a}{{\mathrm{\ρ}}_y(1-a)}\×100\%$

Volume density p according to yarn _y, can be transformed into regain again from the volumetric concentration of water.

2. sizing moisture regain detecting system according to claim 1, it is characterized in that: this microwave launcher comprises successively the signal source that connects, coaxial/waveguide switch, coaxial attenuator and emitting antenna, this microwave receiving device comprise connect successively accept antenna, microwave current detector, frequency-selecting amplifier and data collecting card.

3. sizing moisture regain detecting system according to claim 1 and 2 is characterized in that: the digital signal about dielectric loss that this computing machine will be gathered is carried out the computing of sized warp moisture regain in conjunction with the parameters such as dielectric index in the computer data storehouse.

4. sizing moisture regain detecting system according to claim 3 is characterized in that: the parameters such as dielectric index in this computer data storehouse are imported by input equipment.

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