WO2021159255A1

WO2021159255A1 - Vehicle interior component material odor assessment reference sample preparation and use methods

Info

Publication number: WO2021159255A1
Application number: PCT/CN2020/074666
Authority: WO
Inventors: 丁炫文; 申屠献忠; 万峰; 江小雪; 孙爽民; 金锋; 曹建军; 董宁
Original assignee: 华测检测认证集团股份有限公司
Priority date: 2020-02-10
Filing date: 2020-02-10
Publication date: 2021-08-19
Also published as: CN112740033B; CN112740033A

Abstract

A vehicle interior component material odor assessment reference sample preparation method, comprising: 1) selecting an odor grade determination team; 2) selecting a reference sample; 3) performing grade determination on the reference sample; 4) producing the reference sample. Said method guarantees stability, repeatability, and standardization in the reference sample odor grade by means such as the selection of the odor grade determination team, grade determination of the reference sample, and stability verification. The odor assessment reference sample prepared by said method has good odor representation and can better represent the real odor of a vehicle interior component, facilitating odor assessment personnel in giving objective odor assessments. A representative real material can moreover be found for an interior component of any odor type, and a reference sample yielding a similar odor can be made, thereby facilitating objective assessment of odor grades by odor assessment personnel.

Description

Preparation and use method of reference sample block for odor evaluation of automobile interior materials

Technical field

The invention relates to the field of odor detection, in particular to a method for preparing and using a reference sample block for odor evaluation of automotive interior materials

Background technique

The problem of air quality in the car has attracted more and more attention from consumers and major OEMs. The peculiar smell in the car will directly affect the sensory experience of consumers and the evaluation of vehicle quality. According to the JDPower China New Car Quality Research (IQS) report, among its statistics of problems per 100 cars (PP100), the number of complaints about "unpleasant odors in the car" is the highest for 5 consecutive years. Top (2015～2019). In view of the fact that automotive interior materials are the main source of odor in the car, how to effectively control the odor of automotive interior parts has become a hot, important and difficult issue in the automotive industry.

The problem of odor in cars has a long history. In 1992, the German Automobile Industry Federation issued the "Odor Nature of Automotive Interior Materials" or VDA270 standard (the standard was updated in 2018) in response to this problem. On this basis, major car companies in the automotive industry have formulated relevant odor evaluation methods and eligibility criteria, such as Volkswagen PV3900 and Volvo VCS10272729. Whether it is the VDA270 standard, or the car industry or enterprise odor evaluation standard derived from it, the evaluation principle is based on the olfactory sensory evaluation of people (a team of odor evaluators). The evaluation process is generally as follows:

Step 1: Place the sample under a certain temperature and humidity to allow the volatile substances in its constituents to fully evaporate. First prepare a blank 1L odor bottle with good odor, pour a certain volume of deionized water, and press the sample to be tested according to the standard After cutting, put the scent bottle into the oven, heat the scent bottle to the specified temperature, and take it out for evaluation after the corresponding time.

Step 2: The team of odor evaluators will evaluate the odor generated in Step 1 according to an odor criterion, such as the score according to the VDA270 standard (see Table 1 "VDA270 Odor Evaluation Score Table"), and each sample bottle is at least Three odor evaluators participate in the evaluation and scoring. When the scoring results differ by more than level 2, at least five odor evaluators should perform repeated evaluation and scoring.

Step 3: Qualified judgment

Round off the evaluation results of the odor evaluator team to obtain the final score value. At present, in mainstream car companies, the odor qualification line of most interior parts is equivalent to the 3.5 level of VDA270. For a small number of interior parts with special materials or properties, car companies will appropriately relax their odor qualification lines, such as rubber sealing strips, leather and so on.

1级Level 1	无气味Odorless
2级level 2	有气味，但无干扰性气味Odor, but no disturbing odor
3级Level 3	有明显气味，但无干扰性气味There is a clear smell, but no disturbing smell
4级level 4	有干扰性气味Disturbing smell
5级Level 5	有强烈干扰性气味Strong disturbing odor
6级Level 6	有不能忍受的气味Has an unbearable smell

Table 1: VDA270 odor evaluation scoring table

In the above-mentioned industry and corporate standards, odor evaluation mainly relies on the sense of smell of people (a team of odor reviewers). The sense of smell has individual sensitivity differences. Because the differences in individual human olfactory receptor genes will directly affect the sensitivity to different substances, For example, the olfactory receptor OR6A2 is very sensitive to aldehyde compounds, and the sense of smell is subjective (for example, some people like the smell of gasoline, but some people don’t), and are susceptible to fatigue and emotional effects. Being in a certain odor environment will cause olfactory fatigue, and it is difficult to objectively evaluate odors if they are used to this type of odor. Therefore, in the odor evaluation of interior parts, the evaluation of the same sample by the same odor evaluator at different times and places is prone to deviation, or the evaluation of the same sample by different odor evaluators at the same time and place deviates, which is the most serious situation. That is, when the evaluation results of the same interior materials by different odor evaluators are distributed on both sides of the qualification line, whether the batch of interior materials is qualified or not often causes greater controversy.

It should be noted that despite the current existence of electronic noses, the automotive industry basically uses odor evaluators instead of instrument measuring equipment to evaluate the odor of interior parts mainly based on the following two reasons:

a. The current electronic nose products on the market have poor olfactory sensitivity (about thousands to tens of thousands of times different from human noses). The key is that the number of taste patterns that can be effectively identified is too small. Technically in the short term Neither can represent the human sense of smell, nor can it replace the human sense of smell;

b. When consumers buy and use cars, they are judged based on their personal sense of smell in the car. Therefore, the car interior odor evaluation test also uses the smell of the odor evaluator to evaluate it, which is closer to the consumer's standpoint.

Since the sense of smell of odor evaluators is the core method of odor evaluation, and this method is greatly influenced by odor evaluators, in order to ensure the accuracy and fairness of odor evaluation methods, and reduce disputes, major standard issuers (including car manufacturers and industry Association, etc.) require training and calibration of odor evaluators in accordance with the standards required by the standard. The current calibration method commonly used in the industry is to refer to ISO 12219-7-2017 "Determination of Odor in the Interior Air of Road Vehicles". The calibration method is as follows: configure a certain amount of n-butanol solution, and separate the 6 gradient solutions in Table 2 Pipette 10mL into a 10L air bag, and place it in a sealed place at a controlled room temperature for at least 4h to reach a gas-liquid two-phase equilibrium, and then conduct strength evaluation. This method uses a reference standard solution with a known intensity value to select odor evaluators or correct their evaluation levels. When a new odor evaluator evaluates the odor intensity, the correct rate must reach 80% or more.

Table 2: Concentration gradient of n-butanol solution in ISO 12219-7-2017

The shortcomings of the odor evaluation methods in the above-mentioned industry or enterprise standards are:

1) The single odor chemical substance solution represented by n-butanol lacks representativeness and practicality as a reference sample for odor training and calibration: First of all, a large amount of actual test data shows that even the interior parts of a single material emit There are generally dozens of types of chemical substances, such as PU polyurethane foaming materials, and the odorous chemical substances it emits usually include more than 50 chemical substances such as amines, aldehydes, ethers, and phenols; EPDM ethylene propylene rubber materials, the chemical substances it emits also include more than forty chemical substances such as phenols, amines, thiazoles, and alkanes. Moreover, the odor chemicals emitted by these interior materials exhibit completely different odor properties from the n-butanol solution, that is, the single odor chemical solution represented by the n-butanol solution is not representative of the odor of automotive interior materials. .

Moreover, due to the diversity of the types and combinations of automotive interior materials, such as PP (polypropylene), PC (polycarbonate), PA (nylon), ABS, PU, PET, leather, and dashboards composed of these, The odor properties of steering wheel, roof, seat, carpet and other parts also show diversity and variability. None of the materials or parts exhibits odor properties that are completely similar to n-butanol. Therefore, n-butanol is used. The odor training and calibration of the solution is extremely limited for odor evaluators. The odor evaluators selected under this training system are difficult to quickly competently perform the odor evaluation work of automotive interior parts, often in actual odor evaluation work. It gradually accumulates practical experience, but due to the characteristics of smell, it often leads to controversy in the results of odor evaluation.

2) Direct smelling and distinguishing odor chemical substance solution has a higher risk to the human body and seriously interferes with the human sense of smell. The n-butanol solution is very irritating and can cause irritation to human eyes, nose and throat, and in severe cases, it is in the superficial cornea. Translucent air bubbles are formed, headache, dizziness, drowsiness, and contact dermatitis can occur when the hands are accidentally touched. In addition, the n-butanol solution has a strong odor and long-lasting odor. Generally, after the evaluation of n-butanol, the odor evaluator needs to rest for half an hour before evaluating other odor bottles, which is not conducive to personnel training and odor evaluation.

Summary of the invention

In order to overcome the above-mentioned shortcomings in the prior art, the present invention provides a method for preparing and using a reference sample block for odor evaluation of automotive interior materials. The odor grade of the prepared reference sample block can be used to calibrate the odor intensity and type evaluation of the odor evaluator. , Provide an objective calibration scale for odor evaluators to evaluate the odor of automotive interior materials, and the reference sample can also be used for odor training and benchmarking of odor evaluators. It is simple to operate, economical and safe.

In order to achieve the above-mentioned objective, the first aspect of the present invention provides a method for preparing and using a reference block for evaluating the odor of automotive interior materials, the method comprising:

1) Screening the odor evaluation team: According to the industry or enterprise odor evaluation standards, select at least 5 qualified odor evaluators, the accuracy of the odor evaluators is 0-0.700, and the stability is 0-0.400;

2) Screening reference samples: According to industry or enterprise odor evaluation standards, the odor grading team will conduct preliminary odor evaluation, and select samples with odor levels between 3.0-4.5;

3) Grading reference sample: on the basis of the preliminary odor evaluation, determine the odor level and parameters of the reference sample according to the actual odor of the sample;

Stability verification: A part of the samples are prepared according to the parameters described in the grading, and then they are vacuum-sealed and placed in a constant temperature and humidity environment for different periods of time. The odor grading team will conduct odor evaluation, compare with the grading Whether the determined odor levels are consistent;

4) Mass production reference sample: After the grading is completed, take a new sample to prepare the reference sample according to the parameters during the grading, and then vacuum seal.

In some preferred embodiments, at least 7 odor assessors are selected in the step 1).

In some preferred embodiments, the step 1) is completed within 1 week.

In some embodiments, the industry or enterprise odor evaluation standard in step 2) is the VDA270-2018 standard.

In some embodiments, after the vacuum sealing in the step 4), the parameters are identified for the reference sample.

The second aspect of the present invention provides a reference sample block for evaluating the odor of automobile interior materials prepared by the above-mentioned preparation method.

A third aspect of the present invention provides a method of using the reference sample for evaluating the odor of automotive interior materials. The method of use includes:

When the odor test data result of the experimental sample is near the odor qualified line and the odor level cannot be determined, the odor level of the reference sample is compared, and the reference sample is used as a ruler to determine the final odor level of the experimental sample.

The fourth aspect of the present invention also provides a method of using the reference sample block for evaluating the odor of automotive interior materials. The method of use includes:

When selecting or training new odor evaluators or regularly supervising the evaluation level of odor evaluators, the reference samples are processed according to the marked test conditions, and the odor evaluators to be selected or to be trained or to be supervised will perform odor evaluation and compare According to the odor grade of the reference sample, the odor appraisers with obvious deviation were screened out.

The specific usage method is as follows:

Blank acceptance: Number all odor bottles, and conduct blank acceptance for each batch of cleaned odor bottles. Heat at (80±2)℃ for 2h±10min, and perform odor identification according to VDA270-2018 standard. The odor value should be less than or equal to 1.5 .

Sampling method: After each reference sample is taken out of the packaging bag, it is immediately put into the experiment without cutting samples.

Experimental procedure: Put the reference sample in the package into an independent 1L odor bottle, and perform the aging treatment in dry/wet state, heating temperature, and time according to the required conditions on the corresponding packaging label of each reference sample. The process is shown in the figure. 1. The outer packaging label of the sample is shown in Table 2.

Smell identification: Take the processed scent bottle out of the oven, and after cooling according to the cooling time/temperature requirements on the outer packaging of each reference sample, the smeller will evaluate the strength and type according to the method specified by the VDA270-2018 standard.

Statistical deviation and memory training:

Count the results of the sniffer, compare the strength and type that have been graded on the outer packaging of the reference sample, and screen out the obvious deviations;

Re-take a batch of parallel samples of the evaluation reference sample from the warehouse, and repeat the experiment according to the steps 1-4 to inform the deviation personnel of the correct odor result, re-smelt it, and strengthen the memory.

Compared with the prior art, the present invention has the following advantages:

1. In the present invention, the accuracy, stability, and repeatability of the odor grade of the reference sample are ensured through the screening of the odor grading team, the grading reference sample, and the stability verification.

The odor evaluation reference sample prepared by the method of the present invention has good odor representativeness, can better represent the actual odor in automobile interior parts, and is beneficial to the odor evaluator to give an objective odor evaluation. Even the interior parts of any odor type can find representative actual materials and simulate reference samples with similar odors so as to facilitate the objective evaluation of odor levels by odor assessors.

2. The level defined for the reference sample in the present invention is known based on the evaluation level given by the sniffer of the grading team, so the accuracy and stability of the sniffer data of the grading team are very important.

3. The reference sample prepared by the present invention is representative. Generally, the amount used in the car is large, and the strength level is qualified; within the validity period, the property is stable, and the odor intensity and properties will not change significantly with the extension of time; The inventory is large or can be simulated based on automotive interior materials, which can meet the long-term demand for preparation of reference samples.

Therefore, the odor evaluation level of a specific interior material can be created through quantitative sampling, and it can be fixed and reproducible, so it can be used as a standard for judgment and training.

4. When the odor evaluation data result of the experimental sample is near the odor qualification line, and the dispute cannot be determined, it can be compared with the reference sample. Using the reference sample as the standard sample can quickly determine the final odor data result of the experimental sample.

5. The method of the present invention can prepare a reference sample that is closer to the actual interior decoration odor and has a more complete taste. Therefore, the reference sample of the present invention is used as a training control system. The smell and smell ability is more comprehensive, the judgment result is more objective, and the training period is shorter.

6. The odor evaluation reference sample prepared by the method of the present invention meets the eligibility criteria in the odor evaluation standard, and the odor is relatively mild, which will not interfere with other odor identification tasks of the odor evaluator on the same day, and bring to the health of the odor evaluator The stimulation is very small.

7. The method of the present invention provides the calibration direction of the odor level, and sets the control direction for odor control, which can be based on evidence to make the odor evaluation objective.

Detailed ways

The specific embodiments of the present invention will be described in detail below. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not used to limit the present invention.

Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

The endpoints and any values of the ranges disclosed in the present invention are not limited to the precise ranges or values, and these ranges or values should be understood to include values close to these ranges or values. For numerical ranges, between the end values of each range, between the end values of each range and individual point values, and between individual point values can be combined with each other to obtain one or more new numerical ranges. These values The scope should be considered as specifically disclosed herein.

The first aspect of the present invention provides a method for preparing and using a reference block for evaluating the odor of automotive interior materials, the method comprising:

In the present invention, an odor assessor refers to a person who has been professionally trained and qualified according to industry or enterprise odor assessment standards, and is also called an odorizer.

In the present invention, the accuracy of the odor assessor includes the sum of relative deviations calculated according to the average value and the sum of relative deviations calculated according to the mode; the stability of the odor assessor is based on the average value of the standard deviations. Calculated.

In the present invention, selecting at least 5 qualified odor assessors in step 1) specifically includes the following steps:

1) Select samples of automotive interior materials for testing. All odor evaluators are rated according to the odor evaluation standards of the industry or enterprise, and the results are counted; at the same time, the accuracy is checked, and the odor evaluators with obvious deviations are eliminated.

2) Inform the qualified odour assessor of the grading result, and then smell it again to make it memorize the strength grade.

3) Qualified odor evaluators blindly smell, rate, and inspect stability in stages.

4) Statistical results, select the personnel whose accuracy is 0-0.700 and stability is 0-0.400 to enter the odor grading team.

In some preferred embodiments, in order to prevent a high elimination rate of odor assessors in the later period of odor assessors and make odor assessment more objective, at least 7 odor assessors are selected in the step 1).

In some preferred embodiments, in order to prevent the instability of the sample from affecting the stability of the smeller, the step 1) is completed within 1 week.

In the present invention, in the step 2) screening reference samples, according to the industry or enterprise odor evaluation standards, the odor qualification line level of most samples is between 3.0-4.5. Therefore, the odor grading team can be used first Carry out preliminary odor evaluation and screen out samples suitable for reference.

In the step 3) grading reference sample block of the present invention, on the basis of the preliminary odor evaluation, and then on the basis of the preliminary odor evaluation, increase or decrease the sampling amount, and change the heating temperature or time. Create 3.0, 3.5 and other levels (which can be determined according to the actual odor of the automotive interior material samples) to determine the odor level and parameters of the reference sample. For example, when a plastic sample is taken with 9cm*20cm, the odor level is 3.5, then increase the sampling volume to create a standard sample block with a grade of 4.0, and reduce the sampling volume to create a standard sample block with a grade of 3.0. The rest of the materials can be analogized.

Each evaluation requires at least 5 odor evaluators to complete the odor evaluation, collect and summarize all the evaluation results, take the arithmetic average of the evaluation results, round to the nearest half level, and record. Perform at least 3 repeated tests in different time periods to determine the final level.

In the present invention, the odor stability of the reference sample is a key factor affecting its life cycle and usage rate, including the stability of different parts of the original sample, the stability of different temperature and humidity environments, and the stability of different time periods. Therefore, it is necessary to perform the stability verification step in step 3).

Take the time stability verification of a certain felt sample as an example, as shown in the following table, after the grading is completed, it must be verified for different lengths of time to determine whether the sample can finally become a reference sample. Prepare multiple parallel samples at the same time according to the graded sample preparation method of the original felt finished product. Each parallel sample is vacuum-sealed with food-grade aluminum foil and stored in a constant temperature and humidity room. The samples are placed for 1d, 3d, and After 6d, 8d, and 22d, take out one of the parallel samples for testing, and the sniffer of the grading team will smell and evaluate it again. If the final evaluation result is consistent with the grading result at 22d, it indicates that the stability is good and the sample is effective. The time can be 22d, which can be used as a reference sample. The specific data is as shown in Table 2. If the final evaluation result at 22d is inconsistent with the grading result, it means that the stability is not good. The felt sample cannot be used as a reference sample, and additional Find a sample.

In step 4) of the present invention, after the grading is completed, a new sample is taken to prepare a reference sample according to the test conditions, sniffer temperature, sniffer time, sample area and other parameters during the grading of the reference sample.

In step 4) of the present invention, the vacuum sealing can be vacuum plastic sealing with aluminum foil bags.

In step 4) of the present invention, it may also include a label that is affixed to identify parameters after vacuum sealing, and the parameters include sample name, test condition, grade, preparation date, expiration date, and the like.

In the present invention, it may also include the step of confirming to stakeholders: after grading the reference sample block, prepare the reference sample block, mark the accuracy and stability of the odor assessor, and send it to each stakeholder (such as the host) Plants, parts suppliers, third-party testing agencies), ask their odor evaluation team to assist in the following matters: ① Perform odor evaluation on the reference sample according to the same test method. Stakeholder confirmation; ②feed back the grade results after confirmation, and then appropriately adjust the evaluation scale and grading based on the feedback results, and carry out subsequent verification work.

The third aspect of the present invention provides a method for using the reference sample block for evaluating the odor of automotive interior materials, and the method of use includes:

When selecting or training new odor evaluators or regularly supervising the evaluation level of odor evaluators, the reference sample is processed according to the marked test conditions, and the odor evaluators to be selected or to be trained or to be supervised will perform odor evaluation and compare According to the odor grade of the reference sample, the odor appraisers with obvious deviation were screened out.

The use method of the fourth aspect of the present invention includes:

(1) Blank acceptance: Number all odor evaluation containers, perform blank acceptance for each batch of cleaned odor evaluation containers, and perform odor identification according to industry or enterprise odor evaluation standards.

(2) Sampling method: After each reference sample is taken out of the packaging bag, it is immediately put into the experiment without cutting samples.

(3) Experimental procedure: Put the reference sample in the package into an independent odor evaluation container, and perform the aging treatment in dry/wet state, heating temperature, and time according to the required conditions noted on the corresponding package label of each reference sample.

(4) Smell identification: take the processed odor evaluation container out of the heating device, and after cooling down according to the cooling time/temperature requirements on the outer packaging of each reference sample, the odor evaluation to be selected or to be trained or to be supervised The staff conducts the odor evaluation according to the specified method of the industry or enterprise odor evaluation standard, and evaluates the intensity and type.

(5) Statistic results and memory training: ① Count the results of odor evaluators, compare the intensity and type that have been graded on the outer packaging of the reference sample, and screen out obvious deviations;

②Re-take out a batch of parallel samples of the evaluation reference block from the warehouse, and repeat the experiment according to the steps (1) to (4) to inform the deviation personnel of the correct odor results, re-smelt them, and strengthen memory.

In some embodiments, the odor evaluation container may be an odor bottle with a capacity of 1L.

In some embodiments, the industry or enterprise odor evaluation standard is VDA270-2018.

In some embodiments, the heating device is an oven.

Hereinafter, the present invention will be described in detail through examples, but the protection scope of the present invention shall not be limited.

In the following examples, the odor evaluation of automotive interior materials is based on the VDA270-2018 standard.

The equipment used in the following embodiments includes:

设备名称Equipment name	品牌brand	型号model	数量quantity
电热恒温鼓风干燥箱Electric heating constant temperature blast drying oven	上海精宏Shanghai Jinghong	DHG-9203ADHG-9203A	44
真空包装机Vacuum packaging machine	宁波环测实验器材Ningbo Ring Test Equipment	DZQ-520CDZQ-520C	11
恒温恒湿间Constant temperature and humidity room	东莞升微Dongguan Shengwei	V-MH-56V-MH-56	22

Consumables and reagents include: 1L odor bottle, deionized water

Example 1

This example is used to illustrate the preparation method of the reference sample block for the odor evaluation of automotive interior materials

1) Screening the odor rating team

①Select the polyurethane foam of automobile interior materials for testing, and rank according to the VDA270-2018 standard. From the existing odor assessor team, select the smell assessor with good daily stability and accuracy. The statistical results are shown in Table 3; at the same time; Check the accuracy and screen out the odor appraisers with obvious deviation;

②Inform the scent assessor of the grading result, smell it again, and remember the strength grade.

③ Divide into 3 weather taste appraisers blindly smell, rate, and check stability.

④Statistical results, select 9 personnel with good accuracy and stability as the members of the odor grading team.

In order to prevent the instability of the sample from affecting the stability of the sniffer, the above steps must be completed within 1 week.

2) Screening reference samples

Sampling and odor testing are carried out according to the VDA270-2018 standard sampling volume, and samples with odor levels between 3.5-4.5 under 80℃ test conditions are selected.

3) Grading reference sample

On the basis of the preliminary odor evaluation, ^{a sample of 50 cm 3} with an expected odor level of 3.5 is taken.

For each evaluation, at least 5 sniffers must complete the odor evaluation. Collect all the evaluation results. Take the arithmetic average of the evaluation results of 5 sniffers, round to the nearest half level, and record it in the evaluation result record sheet. . Perform 3 repeated tests in different time periods to determine the final level.

After the grading is completed, prepare the reference sample block, then vacuum seal, and place the sample in a constant temperature and humidity environment (temperature 23±2℃, humidity 50±5RH%) for 1d, 3d, 6d, 8d, 22d. Afterwards, a test is performed, and the odor rating team will perform odor evaluation, and compare whether it is consistent with the odor level determined in the rating;

5) After the grading is completed, take a new sample and prepare it in accordance with the sampling amount at the time of grading, vacuum-pack it with an aluminum foil bag, and affix a label. The label clearly identifies the sample name, test conditions, grade, preparation date, and expiration date. And other parameters, spare.

Example 2

The odor evaluation reference sample was prepared according to the method of Example 1, except that the material of the automobile interior trim was PU leather fabric.

Example 3

The odor evaluation reference sample was prepared according to the method of Example 1, except that the automotive interior material was PVC plastic particles.

Example 4

This example is used to illustrate the use method of the reference sample block of automotive interior materials, and is used to illustrate the selection or training of the smell rating team in Example 1-3

(1) Blank acceptance: Number all odor bottles, and conduct blank acceptance for each batch of cleaned odor bottles. Heat at (80±2)℃ for 2h±10min, and perform odor identification according to the VDA270-2018 standard. The odor value should be ≤1.5 level.

(3) Experimental procedure: Put the reference sample in the package into an independent 1L odor bottle, and perform the aging treatment in dry/wet state, heating temperature, and time according to the requirements of the remarks on the corresponding packaging label of each reference sample. An example of the outer packaging label of the sample is shown in Table 4.

(4) Smell identification: take the processed odor bottles out of the oven, and after cooling according to the cooling time/temperature requirements on the outer packaging of each reference sample, the odor evaluation personnel to be selected, to be trained or to be supervised The strength and type are evaluated according to the method specified by the VDA270-2018 standard.

(5) Statistical deviation and memory training: ① Count the results of the odor assessors, compare the intensity and type that have been graded on the outer packaging of the reference sample, and screen out the obvious deviation personnel;

②Re-take out a batch of parallel samples of the evaluation reference sample from the warehouse, and repeat the experiment according to the steps (1)-(4) to inform the deviation personnel of the correct odor results, re-smelt them, and strengthen memory. The above steps are completed within 1 week.

Table 3 Statistics of the accuracy and stability of the sniffer

Table 4 Reference sample label example

The reference sample prepared by the method of the present invention is closer to the actual interior odor situation, and the taste profile is more complete. Therefore, using the reference sample of the present invention as a training control system, the smell and smell ability of the team of odor evaluators is more comprehensive , The judgment result is more objective, and the training period is shorter.

Moreover, the odor evaluation reference sample prepared by the method of the present invention meets the qualified standard in the odor evaluation standard, and the odor is relatively mild, and will not interfere with other odor identification work of the odor evaluator on the same day, which will bring harm to the health of the odor evaluator. The stimulus is less than existing training methods.

Part of the embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, many simple modifications can be made to the technical solution of the present invention. These simple modifications All belong to the protection scope of the present invention.

In addition, it should be noted that the various specific technical features described in the above-mentioned specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention is The combination method will not be explained separately.

In addition, various different embodiments of the present invention can also be combined arbitrarily, as long as they do not violate the idea of the present invention, they should also be regarded as the disclosed content of the present invention.

Claims

A method for preparing a reference block for evaluating the odor of automotive interior materials, characterized in that the method comprises:

1) Screening the odor evaluation team: According to the industry or enterprise odor evaluation standards, select at least 5 qualified odor evaluators, the accuracy of the odor evaluators is 0-0.700, and the stability is 0-0.400;

2) Screening reference samples: According to industry or enterprise odor evaluation standards, the odor grading team will conduct preliminary odor evaluation, and select samples with odor levels between 3.0-4.5;

3) Grading reference sample: on the basis of the preliminary odor evaluation, determine the odor level and parameters of the reference sample according to the actual odor of the sample;

Stability verification: A part of the samples are prepared according to the parameters described in the grading, and then they are vacuum-sealed and placed in a constant temperature and humidity environment for different periods of time. The odor grading team will conduct odor evaluation, compare with the grading Whether the determined odor levels are consistent;

4) Mass production reference sample: After the grading is completed, take a new sample to prepare the reference sample according to the parameters during the grading, and then vacuum seal.
The method for preparing a reference sample block for odor evaluation of automotive interior materials according to claim 1, wherein at least 7 odor evaluators are selected in the step 1).
The method for preparing a reference block for evaluating the odor of automotive interior materials according to claim 1, wherein the step 1) is completed within one week.
The method for preparing a reference sample block for odor evaluation of automotive interior materials according to claim 1, wherein the industry or enterprise odor evaluation standard in step 2) is the VDA270-2018 standard.
A reference block for evaluating the odor of automotive interior materials prepared according to the preparation method of any one of claims 1-4.
A method of using a reference sample block for evaluating the odor of automotive interior materials according to claim 5, wherein the using method comprises:

When the odor test data result of the experimental sample is near the odor qualified line and the odor level cannot be determined, the odor level of the reference sample is compared, and the reference sample is used as a ruler to determine the final odor level of the experimental sample.
A method of using a reference sample block for evaluating the odor of automotive interior materials according to claim 5, wherein the using method comprises:

When selecting or training new odor evaluators or regularly supervising the evaluation level of odor evaluators, the reference sample is processed according to the marked test conditions, and the odor evaluators to be selected or to be trained or to be supervised will perform odor evaluation and compare According to the odor grade of the reference sample, the odor appraisers with obvious deviation were screened out.