CN107764732B - Hair products flexibility detection method based on dynamometry - Google Patents
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- 210000004209 hair Anatomy 0.000 title claims abstract description 303
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- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 201000004384 Alopecia Diseases 0.000 description 1
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- 231100000360 alopecia Toxicity 0.000 description 1
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- 238000001035 drying Methods 0.000 description 1
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Abstract
The hair products flexibility detection method based on dynamometry that the invention discloses a kind of, the test method is by extracting hair products sample, hair products sample is tested, obtain the maximum resistance value in the at the uniform velocity folding process of hair products sample of topknot line density, standard comb of hair products sample and the average water droplet height or height of being averagely on tenterhooks of average Resistance Value and more hairs in hair products sample, recycle hair products flexibility model seek index of correlation for evaluate hair products softness and smooth degree.It is more objective reliable by the method for experimental test, traditional sensory feel by people is avoided to evaluate the existing phenomenon for causing evaluation inaccuracy due to the subjective factor of people.Hair products flexibility detection method provided by the invention based on dynamometry can evaluate the flexibility of hair products by maximum hair comb drag, minimum submissive coefficient, average hair comb drag and average these all indexs of submissive coefficient, and evaluation is more comprehensive comprehensive.
Description
Technical Field
The invention relates to the technical field of hair product detection, in particular to a method for detecting the flexibility of a hair product based on a force measurement method.
Background
The hair product is a wig product which is processed by a series of manufacturing procedures by taking human hair, animal hair or chemical fiber as raw materials, and the hair product can be used for decorating human hair styles, such as filling up physiological defects of lack hair, alopecia and the like, and can be used for hairdressing teaching. In recent five years, the annual growth rate of the hair product industry is kept above 18%, and the global market scale of the hair product industry is expected to keep a higher growth rate in the coming years, and the domestic hair product industry scale also enters a high-speed expansion period along with the increase of market demand.
Hair products are various in variety, and different hair products are different in color, hand feeling, elasticity, drapability and flexibility. The drapability and the flexibility reflect the difference of the materials of the hair product and determine the quality, the price, the appearance, the using effect and the like of the hair product.
The hair product with superior quality has smooth hand feeling and vivid appearance, and can shape good and accord with the aesthetic image of people. Flexibility is an important reference factor for evaluating the quality of hair products, and no method for detecting the flexibility of the hair products is available at home and abroad at present, so that the flexibility evaluation of the hair products is difficult, and inconvenience is brought to research and development design, production and processing, trade and sales, academic exchange and talent culture of the hair products. The method can lay a good foundation for standardizing the hair product industry in China, promote the rapid and healthy development of the hair product industry, improve the product quality, contribute to improving the credibility of the hair product in China, enlarge the export, increase the export foreign exchange capacity and further stabilize the status of the first export country of the hair product in China.
Disclosure of Invention
The invention aims to provide a method for detecting the flexibility of a hair product based on a force measuring method, and solve the problem that the quality of the hair product is difficult to evaluate due to the fact that no method for detecting the flexibility of the hair product exists in the prior art.
In order to solve the technical problems, the invention adopts the following technical routes:
arranging a sample into a hair bundle with one tidy end, holding the tidy end of the sample, naturally dropping the other end of the sample, inserting a standard comb into the sample, moving the sample downwards at a constant speed, measuring a force value in the downward moving process of the standard comb, then measuring the linear density of the hair bundle, measuring the height of the centre of overhang of the hair or the height of water drops by adopting a centre-overhang method or a water drop method, and calculating to obtain various flexibility indexes (hair comb resistance, flexibility coefficient and the like) according to the data obtained by measurement; these compliance indicators can objectively reflect the degree of softness and smoothness of a hair product of known length and mass under defined conditions.
The specific technical scheme is as follows:
(1) extracting a hair product sample to be detected, and humidifying the hair product sample;
(2) detecting the linear density of hair strands of the hair product sample obtained in the previous step;
(3) measuring the maximum resistance value and the average resistance value of the comb in the process of moving down the hair product sample at a constant speed;
(4) determining an average water droplet height or an average height of the centre of overhang of a plurality of hair strands in the hair article sample;
(5) and acquiring the hair comb drag force and/or the compliance coefficient of the hair product sample by utilizing a hair product compliance model according to the linear density, the maximum resistance value, the average resistance value and the average water drop height or the average suspended center height of the hair bundle.
Preferably, in the step (5), the hair product flexibility model comprises a maximum hair comb retardation force model and/or a minimum flexibility coefficient model,
the maximum hair comb retardation model is as follows:
wherein,in order to maximize the drag force of the comb,the value of the maximum resistance is the value of the maximum resistance,is the strand linear density;
the minimum compliance coefficient model is:
wherein,h is the average water drop height or average core height for minimum compliance coefficient.
Preferably, in the step (5), the hair product flexibility model comprises an average hair comb retardation force model and/or an average flexibility coefficient model,
the average hair comb drag force model is as follows:
wherein,in order to average the drag force of the comb,is the average resistance value;
the average compliance coefficient model is:
wherein C is the average compliance coefficient.
Preferably, in the step (1), the humidity-controlled environment of the hair product sample is in accordance with a standard atmospheric environment defined in GB/T6529.
Preferably, in the step (1), several groups of detection samples with certain mass are extracted from the hair product to be detected as the hair product to be detected samples.
Preferably, in the step (2), the method for obtaining the strand linear density of the hair product sample to be measured is as follows:
a. arranging the hair product sample obtained in the step (1) into a hair bundle with one neat end and flat whole;
b. measuring the body length L of the hair strand;
c. obtaining the mass G of the hair bundle by balance weighing;
d. and calculating the linear density of the hair strand.
Preferably, the step (3) specifically includes:
a. arranging the hair product sample obtained in the step (2) into a hair bundle with one end tidy and the other end naturally drooping and being straight as a whole;
b. inserting a standard comb into the hair bundle, descending the standard comb along the hair bundle at a constant speed, and recording an average test resistance value and a maximum test resistance value of the standard comb in the descending process;
c. carrying out at least 3 times of tests of the comb descending along the hair bundle at constant speed, and recording the average test resistance value and the maximum test resistance value received by the comb descending along the hair bundle at constant speed each time;
d. and calculating an average value of the average test resistance values obtained in each test as the average resistance value, and calculating an average value of the maximum test resistance values obtained in each test as the maximum resistance value.
Preferably, the step (4) specifically includes:
a. randomly drawing a certain number of hairlines from the hairproduct sample obtained in the step (3), and marking two ends of each hairline with a fixed-length interval;
b. respectively taking the obtained hairlines, fixing the marked two ends in a crossed manner to bend the parts with fixed length intervals into a water drop shape or a suspended center shape, standing for a certain time, and measuring the water drop height or the suspended center height of the parts, namely the distance from the intersection point of the hairlines to the lowest point of the bending part of the hairlines;
c. the average is taken as the average drop height or average core height.
Preferably, the comb is a standardized comb, the surface of the comb is required to be smooth and not generate static electricity, the material of the comb can be stainless steel, oxhorn, organic glass, solid wood and the like, and if the comb is selected to be a wooden comb, the standard QBT 4075-.
The invention has the beneficial technical effects that:
1. the method comprises the steps of extracting a hair product sample, testing the hair product sample to obtain the linear density of hair strands of the hair product sample, the maximum resistance value and the average resistance value of a comb in the process of moving down along the hair product sample at a constant speed and the average water drop/hanging height of a plurality of hair wires in the hair product sample, and then utilizing a hair product flexibility model to obtain related indexes for evaluating the flexibility degree and the smoothness degree of the hair product. The method provided by the invention is a test method, and is more objective and reliable, and the evaluation inaccuracy caused by subjective factors of people is avoided.
2. The method for detecting the flexibility of the hair product based on the force measuring method can evaluate the flexibility and smoothness of the hair product through multiple indexes of maximum hair comb blocking force, minimum compliance coefficient, average hair comb blocking force and average compliance coefficient, and the evaluation is comprehensive and comprehensive.
3. The method for detecting the flexibility of the hair product based on the force measuring method has the advantages of good reliability, very high realizability and reproducibility, and high precision of the obtained indexes for evaluating the flexibility of the hair product, so that the evaluation result is accurate and reliable.
Drawings
Fig. 1 is a flowchart of a method for detecting the flexibility of a hair product based on a force measurement method according to embodiment 1 of the present invention;
FIG. 2 is a detailed flowchart of step S20 in FIG. 1;
FIG. 3 is a detailed flowchart of step S30 in FIG. 1;
FIG. 4 is a detailed flowchart of step S40 in FIG. 1;
FIG. 5 is a schematic view showing measurement of height of a hair drop in example 1 of the present invention;
fig. 6 is a schematic diagram of measuring the height of a hairline's hanging core in example 1 of the present invention.
Detailed Description
The following examples are intended to illustrate the present invention in detail and should not be construed as limiting the scope of the present invention in any way.
The testing or measuring methods involved in or relied on in the following examples are conventional in the art, and those skilled in the art can make routine selection or adaptation according to specific application scenarios, unless otherwise specified. The components, structures, mechanisms and the like in the following examples are all conventional commercially available products unless otherwise specified.
Example 1
The method for detecting the flexibility of the hair product based on the force measuring method can be used for detecting the flexibility of the hair product. Combs are tools used specifically for grooming hair, including hair products, and the resistance experienced by the comb during grooming of the hair product is a function of how compliant the hair product is. The embodiment of the invention provides two indexes for expressing the flexibility of a hair product: drag and compliance coefficient of the comb.
The size of the drag force and the compliance coefficient of the hair comb can be used for expressing the compliance of hair growing, hair blocking, hair coloring or hair spring products, wherein the hair growing refers to unprocessed human hair, the hair blocking refers to human hair which is bundled according to different lengths in different grades, the hair coloring refers to human hair or artificial hair which is processed to form hair with different colors, and the hair spring refers to hair products formed by uniformly arranging and connecting the hair coloring, and the hair products are important and commonly used products in the hair products.
As shown in fig. 1, the method for detecting the flexibility of a hair product based on a force measurement method comprises the following steps:
s10: a hair product sample to be measured is extracted, and the humidity of the hair product sample is adjusted.
For hair products such as hair, hair-stop, hair-color or hair-spring, at least 3 test samples are extracted from the products needing to be evaluated for flexibility as hair product samples, and the mass of each hair product sample is not less than 100 g. The collected hair product sample is subjected to humidity conditioning in a standard atmosphere (in accordance with the regulation of GB/T6529) for 24 hours in advance, the hair product sample is subjected to humidity conditioning in the standard atmosphere before the test, and air is allowed to flow smoothly through the hair product sample during the humidity conditioning period. Conditioning prevents the hair product from drying or becoming too moist, and from affecting its flexibility.
S20: the strand linear density of the hair product sample obtained in the above step was measured.
The strand linear density is the mass of the strand of hair product per unit length, and is dependent on the sample of hair product used for testing. As shown in fig. 2, the present step specifically includes:
s201: a set of hair article samples was arranged into a strand of hair having a clean end and being generally flat. One end of one group of hair products is clamped orderly by a special clamp, and the other two groups of detection samples are reserved.
S202: the body length L of the tress of hair held by the holder is measured to the nearest 0.1 cm.
S203: the mass G of the tress was taken with a balance weight, the mass G being accurate to 0.1 mg.
S204: according toThe linear density of the hair strand held by the holder is determined.
According to the formulaLinear density of hair strandsThe unit of (d) is tex, which is the standard unit of linear density.
S30: and (4) measuring the maximum resistance value and the average resistance value of the standard comb in the process of moving the standard comb down along the hair product sample at a constant speed.
The standard comb is a stainless steel comb with smooth surface, no static electricity, 10-100 g of mass and 3 needles/cm of comb tooth density, and the resistance of the standard comb in the process of inserting the hair bundle downwards is related to the smoothness of the hair product. The hair product sample measured in this step is the hair product sample used for detecting the linear density of the hair product hair bundle in step S20. As shown in fig. 3, the present step specifically includes:
s301: a group of hair product samples are arranged into a hair bundle with one end tidy and the other end naturally drooping and being straight as a whole. The resistance of the hair strands to a standard comb cannot be affected by its own condition, e.g. the hair strands in the hair strands cannot cross.
S302: inserting a standard comb into the hair bundle and descending along the hair bundle at a constant speed, and recording an average test resistance value and a maximum test resistance value of the standard comb in the descending process, wherein the average test resistance value and the maximum test resistance value are accurate to 0.1cN, and cN represents centinewtons. The descending speed of the standard comb inserted into the hair bundle and descending along the hair bundle at a constant speed is 10mm/min, the descending distance is 200mm, the gauge length of the hair bundle is 10mm, and the gauge length refers to the initial distance between the standard comb and the holder.
S303: and (3) performing at least 3 times of tests of the standard comb descending along the hair bundle at constant speed, recording the average test resistance value and the maximum test resistance value of each time of the standard comb descending along the hair bundle at constant speed, wherein the 3 times of tests are directed at the same group of hair product samples.
S304: and averaging the average test resistance values obtained in each test to obtain a final average resistance value, and averaging the maximum test resistance values obtained in each test to obtain a final maximum resistance value.
S40: the average drop height or average core height of a plurality of hair strands in a hair preparation sample is measured.
The hair drawn in this step is from the hair product sample in step S30. As shown in fig. 4, the step of determining the average water drop height of the hair specifically includes:
s401: randomly drawing a plurality of hair yarns from the hair product sample, marking two ends of the fixed-length interval of each hair yarn, wherein the fixed-length interval is 50 mm. The fixed-length spacing refers to a portion of fixed length on all of the hairs drawn, with markings being made at both ends of that portion of each hair.
S402: the two ends of the fixed-length interval part marked by one hairline are clamped, the fixed-length interval part is in a water drop shape, the height between the top end and the bottom end of the water drop-shaped hairline part is measured after the hairline part is kept still for 1 minute and is used as the height of the water drop, and the corresponding height of the water drop is measured for all the extracted hairlines.
S403: the average water droplet height was determined as the average water droplet height.
Similarly, for the hair drawn from the hair product sample in step S30, the average height of the hanging core obtained by measuring the height of the hanging core of each hair may be used instead of the average height of the water drop.
As shown in fig. 5, for measuring the height of a water drop of a hair, one hair 1 is drawn from a hair product, both ends of the hair 1 are held in a drop shape, the distance h1 between the intersection point of the upper end and the bottom end point of the drop-shaped hair is defined as the height of the water drop, the height of the water drop represents the softness of the hair 1, and the higher the height of the water drop, the softer the hair is.
As shown in fig. 6, for measuring the height of the hanging core of the hair, one hair 2 is drawn from the hair product, both ends of the hair 1 are held in the shape of the hanging core, and the distance h2 between the intersection of the upper end of the hanging core-shaped hair and the bottom end point of the bending part is defined as the height of the hanging core, which represents the softness of the hair 2, and the higher the height of the hanging core, the softer the hair.
S50: and acquiring the hair comb blocking force and/or the compliance coefficient of the hair product sample by utilizing a hair product compliance model according to the linear density, the maximum resistance value, the average resistance value and the average water drop height or the average suspended center height of the hair bundle.
The resistance of the standard comb inserted into the hair product hair bundle in the process of moving along the hair bundle at a constant speed is related to the linear density of the hair bundle, and the resistance is in change, so the hair product flexibility model provided by the embodiment of the invention comprises a hair comb retarding force model, and the hair comb retarding force model comprises a maximum hair comb retarding force model and an average hair comb retarding force model.
The maximum hair comb retardation model is as follows:
（1）
wherein,in order to maximize the drag force of the comb,the maximum resistance value of the standard comb inserted into the hair product during the process of moving the hair product hair bundle at a constant speed,is the strand linear density.
Strand linear density of hair product strandsConstant, maximum resistance valueThe smaller the hair comb dragA smaller size indicates a more smooth hair strand in the hair product.
The average hair comb drag force model is:
（2）
wherein,in order to average the drag force of the comb,the average resistance value of the hair product hair bundle inserted into the standard comb during the uniform movement of the hair product hair bundle,is the strand linear density.
Strand linear density of hair product strandsConstant, average resistance valueThe smaller the average hair comb dragA smaller size indicates a more smooth hair strand in the hair product.
Maximum hair comb drag force obtained by maximum hair comb drag force model calculationThe evaluation of the flexibility of the hair product is reliable as long as the evaluation is most reliableDrag force of large hair combNot exceeding a certain threshold value indicates that the overall hair product is smooth to the desired degree. Average drag force of combThe smoothness of the entire hair product can be comprehensively evaluated.
Then, the flexibility of the hair product comprises the flexibility degree and the smoothness degree, the height of the water drops or the height of the suspended core represents the flexibility degree of the hair product, and the hair bundle blocking force represents the smoothness degree of the hair product.
The minimum compliance coefficient model is:
（3）
wherein,at a minimum compliance factor, h is the number of strands in a bundle of hair pieces
Average drop height obtained from hairline testing. The height of the water drop is fixed, the smaller the maximum hair comb retardation force is, the larger the minimum compliance coefficient is, and the local compliance of the hair bundle is good.
The average compliance coefficient model is:
（4）
wherein C is the average compliance coefficient. The water drop height is fixed, the smaller the average hair comb retardation force is, the larger the average compliance coefficient is, and the hair bundle compliance is good.
The flexibility of the hair product can be evaluated by the result obtained by any one of the maximum hair comb retarding force model, the average hair comb retarding force model, the minimum compliance coefficient model and the average compliance coefficient model, and the flexibility of the hair product is preferably evaluated by the results obtained by the four models together, so that the evaluation is comprehensive, objective and reliable.
Specifically, when the maximum combing drag force, the average combing drag force, the minimum compliance coefficient and the average compliance coefficient are obtained, the results obtained in step S20 and step S30 are substituted into formula (1) and formula (2), the maximum combing drag force and the average combing drag force are calculated respectively, the maximum combing drag force, the average combing drag force and the results obtained in step S40 are substituted into formula (3) and formula (4), and the minimum compliance coefficient and the average compliance coefficient are calculated respectively.
The definition of the related terms in the embodiments of the present invention is as follows:
flexibility of the hair article: hair pieces of known length and mass are soft and smooth under specified conditions.
Hair comb drag force (retardant force of hair comb): the force value measured when the unit linear density hair product sample prevents the standard comb from moving downward at a constant speed under specified conditions is used for indicating the smoothness degree of hair strands.
Compliance ratio (compliance ratio): the indication of the flexibility of the hair strand is the ratio of the height of the drop or the height of the overhang of the hair strand to the force of the hair comb.
Drop height (strip height): the softness index of the hair is expressed, and the distance between the intersection point of the upper end and the bottom end point of the bending part after the long hair is bent into a drop shape is specified.
Centre height: the softness index of the hair is expressed, and the distance between the intersection point of the upper end and the bottom end point of the bending part after the long hair is bent into a suspended heart shape is specified.
The maximum comb drag, average comb drag, minimum compliance factor, and average compliance factor can all be used to evaluate the compliance of a hair product. The minimum compliance coefficient and the average compliance coefficient directly reflect the compliance of the hair product, and the large compliance coefficient indicates that the hair product has good flexibility and smoothness; the maximum hair combing retardation force and the average hair combing retardation force reflect the smoothness degree of the hair product, and small hair combing retardation force indicates that the smoothness degree of the hair product is good.
By using the detection method, the flexibility indexes of the obtained hair bundle are highly close to each other for 2 single tests which are finished under the conditions of the same laboratory, the same operator, the same equipment and in a short time interval on the same detection sample. By using the detection method, the flexibility indexes of the obtained hair bundle are highly close to each other for the same batch of hair product through a single test completed under the conditions of different laboratories, different operators and different devices.
According to the method for detecting the flexibility of the hair product based on the force measurement method, the hair product sample is extracted and tested to obtain the linear density of hair strands of the hair product sample, the maximum resistance value and the average resistance value of a standard comb in the process of moving down the hair product sample at a constant speed and the average water drop height of a plurality of hair filaments in the hair product sample, then the maximum hair comb resistance force, the average hair comb resistance force, the minimum flexibility coefficient and the average flexibility coefficient are obtained by utilizing a hair product flexibility model, and the flexibility of the hair product is evaluated by utilizing the indexes, so that the method is good in reliability, high in precision and accurate in evaluation result.
While the present invention has been described in detail with reference to the drawings and the embodiments, those skilled in the art will understand that various specific parameters in the above embodiments can be changed without departing from the spirit of the present invention, and a plurality of specific embodiments are formed, which are common variation ranges of the present invention, and will not be described in detail herein.
Claims (6)
1. A method for detecting the flexibility of a hair product based on a force measurement method is characterized by comprising the following steps:
(1) extracting a hair product sample to be detected, and humidifying the hair product sample;
(2) detecting the linear density of hair strands of the hair product sample obtained in the previous step;
(3) measuring the maximum resistance value and the average resistance value of a standard comb in the process of moving down the hair product sample at a constant speed;
(4) measuring the average water drop height or the average hanging center height of a plurality of hairlines in the hair product sample, and specifically comprises the following steps:
a. randomly drawing a certain number of hairlines from the hairproduct sample obtained in the step (3), and marking two ends of each hairline with a fixed-length interval;
b. respectively taking the obtained hairlines, fixing the marked two ends in a crossed manner to bend the parts with fixed length intervals into a water drop shape or a suspended center shape, standing for a certain time, and measuring the water drop height or the suspended center height of the parts, namely the distance from the intersection point of the hairlines to the lowest point of the bending part of the hairlines;
c. taking the average value as the average water drop height or the average suspension center height;
(5) acquiring the hair comb retarding force and/or the compliance coefficient of the hair product sample by utilizing a hair product compliance model according to the hair bundle linear density, the maximum resistance value, the average resistance value and the average water drop height or the average suspended core height, wherein the hair product compliance model comprises a maximum hair comb retarding force model, a minimum compliance coefficient model, an average hair comb retarding force model and/or an average compliance coefficient model,
the maximum hair comb retardation model is as follows:
wherein,in order to maximize the drag force of the comb,the value of the maximum resistance is the value of the maximum resistance,is the strand linear density;
the minimum compliance coefficient model is:
wherein,is the minimum compliance coefficient, h is the average water droplet height or average core height;
the average hair comb drag force model is as follows:
wherein,in order to average the drag force of the comb,is the average resistance value;
the average compliance coefficient model is:
wherein C is the average compliance coefficient.
2. The method for detecting the flexibility of a hair product according to claim 1, wherein in the step (1), the humidity-controlled environment of the hair product sample is in accordance with a standard atmospheric environment defined in GB/T6529.
3. The method for detecting the flexibility of a hair product based on a force measuring method as claimed in claim 1, wherein in the step (1), a plurality of groups of detection samples with certain mass are extracted from the hair product to be detected as the hair product to be detected samples.
4. The method for detecting the flexibility of the hair product based on the force measuring method as claimed in claim 1, wherein in the step (2), the method for acquiring the linear density of the hair bundle of the hair product sample to be detected is as follows:
a. arranging the hair product sample obtained in the step (1) into a hair bundle with one neat end and flat whole;
b. measuring the body length L of the hair strand;
c. obtaining the mass G of the hair bundle by balance weighing;
d. and calculating the linear density of the hair strand.
5. The method for detecting the flexibility of the hair product based on the force measurement method as claimed in claim 1, wherein the step (3) specifically comprises:
a. arranging the hair product sample obtained in the step (2) into a hair bundle with one end tidy and the other end naturally drooping and being straight as a whole;
b. inserting a standard comb into the hair bundle, descending the standard comb along the hair bundle at a constant speed, and recording an average test resistance value and a maximum test resistance value of the standard comb in the descending process;
c. carrying out at least 3 times of tests of the standard comb descending along the hair bundle at constant speed, and recording the average test resistance value and the maximum test resistance value of the standard comb descending along the hair bundle at constant speed each time;
d. and calculating an average value of the average test resistance values obtained in each test as the average resistance value, and calculating an average value of the maximum test resistance values obtained in each test as the maximum resistance value.
6. The method for detecting the flexibility of the hair product based on the force measuring method as claimed in claim 1, wherein the standard comb is a smooth comb which does not generate static electricity.
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