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Affects the detection of down bulkiness Several factors in the result
The bulkiness is an important indicator for the Quality of feathers and down, which refers to the degree of elasticity of feathers and down. Feather and down are composed mainly of polymers condensed from a variety of amino acids and have a stable morphological structure. If not affected by chemicals or large temperature differences, the down, no matter how twisted, twisted or crushed, can return to its original shape return to original form original state, initial form. Therefore, whether the feathers and down can be restored to the best initial shape during the testing process is directly related to the final result of the bulkiness test.Duringof the test procedure, the following factors also affect the final test result.
1. Sampling method for testing
Sampling required for testing After the product is stored and transported, the evenness of the distribution of down in the sample and the openness of the down will inevitably be affected when it is sent to the testing site. Therefore, whether a representative sample can be obtained during sampling and whether the down form is crushed by over-gripping will affect the final loft.
2. The method of restoring the random shape of feathers and down
The key to the Down Bulkiness Test is the key to the Down Bulkiness Test , there are none unified restoration method in the national standards, China's national standards and textile industry standards mainly prescribe IOS 10288-2003 Inspection methods for down and feathers, FZ/T 80001 – 2002The reduction method adopted in the Washed Feather Test Method and the International Down and Feather Bureau Official Analysis Method.
1, oven reduction method1
Standards used: IOS 10288– 2003 Down Feather Inspection Method
Take a sample of approximately 30 g from the laboratory sample and place it in the eight basket oven at (70±2)℃dried at temperature 45min, and then shake the samples into the pretreatment box one by one by hand, make them loose at the temperature (20±2)℃, The relative humidity(65±2)%recovers formore than 24h, and then the bulkiness test is performed.
2 、Furnace reduction method2
Standards usedFZ/T 80001–2002Washing Feather Down Test Method
Place the down at (50±5)℃The temperature will continue to hea1h, then shake the samples individually by hand into the pretreatment box and leave to stand 24 hours After that, take it out for a bulkiness test.
3 , Tumble Dryer Reduction Process
Standard used: International Down and Feather Bureau(IDFB) Official Method of Analysis
Take50 g Down samples are placed in a cotton bag measuring 50cm×60cm sewn in or zippered(fine warp and weft The grade is 10tex, and the width and Length density is 50root /cm, plain weave 1/1, weight per square meter100～110), dry at (50~70)℃tumble dryer 30min, then put the sample in a room that can keep the temperature(20± 2)℃ , relative humidity(65±4)%at least balanced 72 hours under normal atmospheric conditions.
4, steam reduction method
Standards used: International Down and Feather Bureau(IDFB)Official Analysis Method
Take the mixed representative down sample35g～40g into the recovery box. Down should be fluffy and not lumps or lumps. Use a steam engine(Pressure: 40 PSI～50 PSI)Blow steam into the collection chamber40s (each side10s). 3min～10minThen with a hair dryer(1400Watt～1800Watt)Dry the down, at least2min (each side30s ) . Place the sample in the temperature(20±2)℃, relative humidity(65±4)% (65±4)%
Restored under normalen atmospheric conditions(48±24)h. These reduction methods are very different in operation, and the reduction effect on down is naturally high or low. International down and feather testing laboratories and research institutes, based on a large number of experiments, have come to a conclusion: no matter what operating factors the test samples are exposed to before they arrive at the test laboratory, the vapor reduction method can provide more stable and accurate measurement results. In the latest 2008 edition of the International Bureau of Down and Feather Official Methods of Analysis, steam reduction has replaced tumble drying as the official method.
3. The influence of temperature and humidityin the laboratory
This influencing factor is primarily aimed at FZ/T 80001-2002 Washed Feather Down Test. Method Based on the bulkiness test. Among the various reduction methods, only FZ/T 80001-2002 washed feathers test method does not have a specific temperature and humidity for the standing phase in the pre-treatment Therefore, if the standing phase is not carried out under normal atmospheric conditions, the temperature and humidity of the test site will inevitably lead to discrepancies in the final test results, and even the same batch of samples will produce completely different results at different test sites.
4. Down Bulk Testing Method and Scale
Although the test methods for down bulkiness differ in different countries, the principle is the same: they all take a certain number of samples and place them in a cylinder that puts them under a certain load volume read represents the bulkhead. According to IOS 10288-2003 Down and Feather Inspection Method, FZ/T 80001-2002 Test Method for Washed Feather and Down and Official Analysis Method of International Bureau of Down and Feather as examples:
1,IOS 10288-2003 Inspection method for down andnd feathers: Weigh the loosened sample 28.4 g and shake it in
2、FZ/T 80001-2002 Washing Feather and Down Test Method: except that the weight of the weighed sample 28.5 g With the exception of , the others comply with IOS 10288-2003 Inspection Methods for Down and Feathers .
3 , “International Down and Feather Bureau Official Analysis Method”: Although the pre-treatment is divided into drum drying reduction methods and steam reduction methods, the test operation process is after the pretreatment is the same.30 g Put the sample in the measuring tube and blow it off with a blower5s. It must be blown twice before the first measurement and once before the next 4 measurements. When the start button is pressed, the weight plate moves down at a predetermined speed(0.54 m/min). When the compression plate touches the sample in the graduated cylinder, its downward speed is reduced to less than 0.3 m/min due to the reaction force of the sample. At the same time, the loading time(1min) begins and the test value is displayed continuously. The measured value after loading time1min is printed out. Each sample was tested 5 times.
V. Experimental Equipment and Manpower Impact
IOS of my country 10288-2003Down and Feather Test Method and FZ/T 80001-2002Washed Feather and Down Test Method, the test process involves manual operation, including stirringen There are two steps for paving and covering the metal plate, while the Official Method of Analysis of the International Down and Feather Bureau is a fully mechanized operation. The stability of manual operation is far from comparable to that of mechanized operation. Different people or even the same person at different times will perform different operations. Of course, the objectivity and accuracy of test results cannot be fully guaranteed.
