阅读说明：本技术 一种基于热学性质间接检测浆纱上浆率和回潮率的方法 (Method for indirectly detecting sizing percentage and moisture regain of slashing based on thermal properties ) 是由 郑征 马剑斌 毛海良 徐锦龙 王松林 于 2020-06-15 设计创作，主要内容包括：本发明涉及浆纱性能检测技术领域,公开了一种基于热学性质间接检测浆纱上浆率和回潮率的方法,步骤为：(1)用上浆率检测装置和国家标准方法分别测定标准浆纱样品的上浆率w<Sub>B</Sub>和回潮率w<Sub>M</Sub>；(2)用量热计和导热系数仪分别测定标准浆纱样品的比热容值c<Sub>P,mix</Sub>和导热系数值λ<Sub>mix</Sub>；(3)通过步骤(1)和(2)的测量数据分别拟合得到浆纱比热容值c<Sub>P,mix</Sub>及导热系数值λ<Sub>mix</Sub>与w<Sub>B</Sub>和w<Sub>M</Sub>的函数关系式：(4)用量热计和导热系数仪分别测定待测浆纱样品的比热容值和导热系数值,并通过步骤(3)中得到的函数关系式计算出待测浆纱样品的上浆率和回潮率。本发明用量热计和导热系数测试仪来联合检测浆纱上浆率和回潮率,具有检测结果精准、成本低、快速方便、可重复性好的优点。(The invention relates to the technical field of slashing performance detection, and discloses a method for indirectly detecting slashing sizing percentage and moisture regain on the basis of thermal properties, which comprises the following steps: (1) sizing percentage w of standard slashing sample is respectively measured by using a sizing percentage detection device and a national standard method B And moisture regain w M (ii) a (2) Respectively measuring the specific heat capacity value c of a standard slashing sample by using a calorimeter and a thermal conductivity meter P,mix And heat conductivity value λ mix (ii) a (3) Respectively fitting the measured data of the steps (1) and (2) to obtain a slashing specific heat capacity value c P,mix And heat conductivity value lambda mix And w B And w M Functional relationship of (c): (4) and (4) respectively measuring the specific heat capacity value and the heat conductivity value of the slashing sample to be measured by using a calorimeter and a heat conductivity coefficient instrument, and calculating the sizing rate and the moisture regain of the slashing sample to be measured by using the functional relation obtained in the step (3). The invention uses the calorimeter and the heat conductivity tester to jointly detect the sizing percentage and the moisture regain of sizing, and has the advantages of accurate detection result, low cost, rapidness, convenience, good repeatabilityThe advantages of (1).)

1. A method for indirectly detecting the sizing percentage and the moisture regain of slashing based on thermal properties is characterized by comprising the following steps:

(1) sizing percentage w of standard slashing sample is respectively measured by using a sizing percentage detection device and a national standard method_BAnd moisture regain w_M；

(2) Respectively measuring the specific heat capacity value c of a standard slashing sample by using a calorimeter and a thermal conductivity meter_P,mixAnd heat conductivity value λ_mix；

(3) Respectively fitting the measured data of the steps (1) and (2) to obtain a slashing specific heat capacity value c_P,mixAnd heat conductivity value lambda_mixAnd w_BAnd w_MFunctional relationship of (c):

c_P,mix＝c_P,mix(w_B,w_M) ①

λ_mix＝λ_mix(w_B,w_M) ②；

(4) and (4) respectively measuring the specific heat capacity value and the heat conductivity value of the slashing sample to be measured by using a calorimeter and a heat conductivity coefficient instrument, and calculating the sizing rate and the moisture regain of the slashing sample to be measured by using the functional relation obtained in the step (3).

2. The method for indirectly detecting the sizing percentage and the moisture regain of the slashing based on the thermal property as claimed in claim 1, wherein the sizing percentage of the standard slashing sample is determined by using a Telecol system of a German grand slasher.

3. The method for indirectly detecting the sizing percentage and the moisture regain of the slashing based on the thermal property as claimed in claim 1 or 2, wherein the moisture regain of the standard slashing sample is determined by the method in GB/T6503-2008 "test method for moisture regain of chemical fiber" in step (1).

4. The method for indirectly detecting the sizing percentage and the moisture regain of the slashing according to claim 1, wherein the specific heat capacity of the standard slashing sample and the slashing sample to be detected is determined by the method in GJB 1715-.

5. The method for indirectly detecting the sizing percentage and the moisture regain of the slashing based on the thermal property as claimed in claim 1 or 4, wherein the thermal conductivity of the slashing sample is measured by the method of GB/T10297-1998 "thermal conductivity of non-metallic solid material" thermal conductivity measuring thermal method "by using a thermal conductivity meter of thermal method in steps (2) and (4).

6. The method for indirectly detecting the sizing percentage and the moisture regain of the slashing according to claim 1, wherein the slashing specific heat capacity value c in ① in the step (3) is_P,mixAnd w_BAnd w_MThe functional relationship of (A) satisfies:

7. The method for indirectly detecting the sizing percentage and the moisture regain of the slashing according to claim 1 or 6, wherein the slashing thermal conductivity value λ is ② in the step (3)_mixAnd w_BAnd w_MThe functional relationship of (A) satisfies:wherein A is₂、B₂、C₂、D₂Is a constant.

8. The method for indirectly detecting the sizing percentage and the moisture regain of the slashing according to claim 1, wherein the measurement in the steps (1), (2) and (4) is performed in the same temperature and humidity range.

9. The method for indirectly detecting the sizing percentage and the moisture regain of the slashing according to claim 8, wherein the temperature is in a range of 8-40 ℃ and the humidity is in a range of 30-80% RH.

Technical Field

The invention relates to the technical field of slashing performance detection, in particular to a method for indirectly detecting the sizing percentage and the moisture regain of slashing based on thermal properties.

Background

In the warp weaving process, the warp is subjected to certain tension, bending and repeated friction action of a warp stop, a heddle, a reed and the like on a weaving machine. The force repeatedly acts on the warp yarns, the hairiness on the surface of the warp yarns is increased, the warp yarns are pilling, the opening is not clear, and in a serious case, the warp yarns are broken, so that the loom cannot normally run. Therefore, before weaving, a certain amount of sizing agent needs to be added to the warp yarns for sizing, so that the hairiness of the warp yarns can be attached to the surface of the warp yarns and smooth, the performances of the warp yarns, such as wear resistance, bundling property and the like, can be improved, and the weavability of the warp yarns can be improved. When sizing is carried out by using sizing agent, sizing agent prepared by water and sizing agent is applied on the surface of warp yarn, and then a layer of sizing film is formed by drying process and is coated on the surface of warp yarn, and finally a sizing structure integrating sizing agent and warp yarn is formed. In addition, since warp has a certain moisture absorption, slashing is actually a three-component mixture (hereinafter referred to as "slashing mixture" or "mixture") consisting of size, moisture, and dry non-sized warp, wherein slashing sizing percentage is the percentage of the weight of the size attached to the surface of the warp to the weight of the dry non-sized warp, and slashing moisture regain is the percentage of the weight of the moisture attached to the surface of the warp to the weight of the dry non-sized warp.

The sizing rate in the warp sizing process is an important quality control parameter influencing the sizing effect, and the sizing rate measures the protection degree of sizing to yarns to be woven to a certain degree, reflects the weavability of sizing to a certain degree and is a key index for inspecting the quality of sizing. Moisture regain detection is the most common detection item in the textile industry, because moisture regain changes can cause changes in the weight and a series of properties of textile materials, and improper control of moisture regain can seriously affect the quality and subsequent processing of textile materials.

Disclosure of Invention

The invention aims to overcome the defects that in the prior art, when a desizing method and a substance balance method are used for detecting the sizing percentage of slashing, the accuracy of a detection result is lower, and when a humidity measurement method is combined with a size concentration method, the equipment price is higher, the detection cost is high, and the large-scale wide application is difficult; the direct method for detecting the sizing moisture regain has the problems of long time consumption and low efficiency, provides a method for indirectly detecting the sizing rate and the moisture regain of sizing based on thermal properties, uses a calorimeter and a thermal conductivity tester to jointly detect the sizing rate and the moisture regain of sizing, and has the advantages of accurate detection result, low cost, rapidness, convenience and good repeatability.

In order to achieve the purpose, the invention adopts the following technical scheme:

a method for indirectly detecting the sizing percentage and the moisture regain of slashing based on thermal properties comprises the following steps:

(1) sizing percentage w of standard slashing sample is respectively measured by using a sizing percentage detection device and a national standard method_BAnd moisture regain w_M；

(2) Respectively measuring the specific heat capacity value c of a standard slashing sample by using a calorimeter and a thermal conductivity meter_P,mixAnd heat conductivity value λ_mix；

(3) Respectively fitting the measured data of the steps (1) and (2) to obtain a slashing specific heat capacity value c_P,mixAnd heat conductivity value lambda_mixAnd w_BAnd w_MFunctional relationship of (c):

c_P,mix＝c_P,mix(w_B,w_M) ①

λ_mix＝λ_mix(w_B,w_M) ②；

(4) and (4) respectively measuring the specific heat capacity value and the heat conductivity value of the slashing sample to be measured by using a calorimeter and a heat conductivity coefficient instrument, and calculating the sizing rate and the moisture regain of the slashing sample to be measured by using the functional relation obtained in the step (3).

Preferably, the sizing percentage of the standard slashing sample is determined in step (1) by using the Telenol system of a German Sukker slasher.

Preferably, the moisture regain of the standard sized yarn sample is determined in step (1) by the method in GB/T6503-.

Preferably, the specific heat capacity of the standard slashing sample and the slashing sample to be tested is determined by the method in GJB 1715 + 1993 middle temperature specific heat capacity test method for fiber and powder materials by using a copper block calorimeter in steps (2) and (4).

Preferably, the radial thermal conductivity of the standard slashing sample and the slashing sample to be measured is measured by the method in GB/T10297-1998 "measuring thermal conductivity of non-metallic solid material Hot wire method" using a Hot wire thermal conductivity meter in steps (2) and (4).

Preferably, in ① formula of step (3), the slashing specific heat capacity value c_P,mixAnd w_BAnd w_MThe functional relationship of (A) satisfies:wherein A is₁、B₁、C₁、D₁Is a constant.

Preferably, in ② formula of step (3), the slashing thermal conductivity value λ is_mixAnd w_BAnd w_MThe functional relationship of (A) satisfies:

wherein A is₂、B₂、C₂、D₂Is a constant.

Preferably, the measurement operations in steps (1), (2) and (4) are carried out in the same temperature and humidity range.

Preferably, the temperature range is 8-40 ℃, and the humidity range is 30-80% RH.

The invention firstly fits the functional relation between the specific heat capacity value and the heat conductivity value of the sizing and the sizing rate and the moisture regain of the sizing according to the test data of the standard sample, and then measures the value c through two units of a calorimeter and a heat conductivity tester_P,mix、λ_mixThe sizing rate and the moisture regain of the slashing are jointly detected, and the content composition of the slashing is indirectly reflected according to the macroscopic thermal property of the slashing. The functional relational expressions fitted under different test conditions are different, and the method is suitable for detecting the sizing percentage and the moisture regain of slashing under different sizing agents, different warp varieties and different test environments and has wide application range; the measurement error of a copper block calorimeter is less than +/-1%, the measurement error of a hot-wire method thermal conductivity meter is less than +/-3%, the maximum deviation of sizing rate detection is less than +/-0.38%, the maximum deviation of sizing moisture regain detection is less than +/-0.31%, the maximum relative deviation of sizing rate detection is less than +/-2.48%, the maximum relative deviation of sizing moisture regain detection is less than +/-3.89%, the detection result is accurate, and the repeatability is good; meanwhile, the calorimeter and the heat conductivity coefficient tester have low cost, and can realize the quick, convenient, accurate and low-cost detection of sizing percentage and moisture regain of sizing.

The invention selects the specific heat capacity of the sizing as one of the thermal properties for indirectly detecting the sizing rate and the moisture regain of the sizing.

The sized warp is a mixture of size (B), moisture (M) and dry non-sized warp (S), and the measured specific heat capacity value is the specific heat capacity value of the mixture, so that the measured specific heat capacity value is a function of the mass fractions of the size, the moisture and the dry non-sized warp in the mixture. According to the definition of sizing percentage and moisture regain of sizing (sizing percentage is the percentage of the mass of sizing agent attached to the surface of warp yarn and dry non-sized warp yarn, and moisture regain of sizing agent is the percentage of the mass of moisture attached to the surface of warp yarn and dry non-sized warp yarn), the mass fraction of sizing agent and moisture in the mixture is w_S·w_B、w_S·w_M(wherein w_SMass fraction of dry non-size warp yarns in the size mixture) and:

w_S·w_B+w_S·w_M+w_Swhen 1, then:

w_S＝1/(w_B+w_M+1)

therefore, the specific heat capacity value of the slashing mixture satisfies the formula:

c_P,mix＝c_P,mix(w_S·w_B,w_S·w_M,w_S)＝c_P,mix(w_B,w_M) ①

that is, the specific heat capacity value of the blend is related to the sizing percentage and the moisture regain (w)_B、w_M) As a function of (c).

The invention selects the heat conductivity coefficient of the sizing as the other thermal property for detecting the sizing rate and the moisture regain of the sizing.

For fibrous materials, the measurement difficulty of the thermal conductivity coefficient is high due to the slender single size of the fibrous materials, and the thermal conductivity of the monofilaments is obviously anisotropic due to the orientation of microscopic molecules, namely the radial thermal conductivity coefficient and the axial thermal conductivity coefficient of the monofilaments are obviously different. Therefore, the sample form for measuring the thermal conductivity of the fibrous material in most cases at present is the fiber aggregate, that is, the overall thermal conductivity of the test fiber tow. In the thermal conductivity test of fibrous materials, a sample to be tested needs to be prepared into a certain geometric shape, and for example, the radial heat transfer coefficient of a fiber tow is measured by a hot wire method, fibers to be tested need to be tightly attached to form a regularly arranged fiber aggregate with a rectangular geometric shape.

Similarly, the sized yarn is a mixture of size (B), moisture (M) and dry non-sized warp (S), and the measured thermal conductivity value is the thermal conductivity value of the mixture, which is a function of the mass fractions of the size, moisture and dry non-sized warp in the mixture. The heat conductivity value of the sizing mixture satisfies the formula:

λ_mix＝λ_mix(w_S·w_B,w_S·w_M,w_S)＝λ_mix(w_B,w_M) ②

that is, the thermal conductivity of the blend is related to the sizing and moisture regain (w)_B、w_M) As a function of (c).

The specific heat capacity is an index for measuring the heat absorption or heat release capacity of the material, the heat conductivity coefficient is an index for measuring the heat conduction capacity of the material, and no correlation exists between the specific heat capacity and the heat conduction coefficient, so that the measurement value c of the calorimeter_P,mixAnd the measured value lambda of the thermal conductivity tester_mixThe two are independent or unrelated, and the equation sets ① and ② have unique solutions, so the calorimeter measurement value c of the slashing sample to be measured is measured_P,mixAnd the measured value lambda of the thermal conductivity tester_mixAnd substituting the obtained solution into the fitted equation set to calculate the sizing rate and the moisture regain of the slashing sample to be measured.

Therefore, the invention has the following beneficial effects:

(1) the functional relation fitted according to different test conditions is different, the method is suitable for detecting the sizing percentage and the moisture regain of slashing under different sizing agents, different warp varieties and different test environments, and the application range is wide;

(2) the calorimeter and the thermal conductivity tester have small measurement errors, accurate detection results and good repeatability;

(3) the calorimeter and the thermal conductivity tester are simple and convenient to operate, high in detection efficiency and low in cost.

Drawings

FIG. 1 shows the specific heat capacity value c in the example_P,mixConcerning the sizing rate w_BAnd moisture regain w_MIs shown in the functional relationship diagram.

FIG. 2 is a heat conductivity value λ in the example_mixConcerning the sizing rate w_BAnd moisture regain w_MIs shown in the functional relationship diagram.

Detailed Description

The invention is further described with reference to the following detailed description and accompanying drawings.