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Qualitative Analysis Methods And Suggestions For Regenerated Cellulose Fiber

2010/11/8 14:57:00 334

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Fibre Regenerated Cellulose Fiber Standard

Regenerated cellulose fiber

There are many kinds, because the shape of spinneret is different.

fibre

The appearance is different. Even the same spinning fluid can spin fibers with different cross section and longitudinal shape.

The current standard FZ/T01057.3-2007 "textile fiber identification test method third part: microscopy" principle is to observe the longitudinal and cross section shapes of unknown fibers by microscope, and compare the fibers.
標(biāo)準(zhǔn)照片和形態(tài)描述來鑒別未知纖維的類別，筆者認(rèn)為與實際情況不完全相符，故在本文中予以分析且提出幾點建議，使再生纖維素纖維的定性更加合理、切實可行。

1 introduction of regenerated cellulose fiber

　　再生纖維素纖維歸屬化學(xué)纖維中的人造纖維，例如：粘膠纖維、銅氨纖維、高濕模量類纖維(如莫代爾纖維)、脫乙酰化醋酯纖維、二醋酯纖維、三醋酯纖維、萊賽爾纖維、竹纖維等，都是利用自然界中存在的含有纖維素的物質(zhì)如棉短絨、木材、甘蔗渣、蘆葦?shù)鹊睦w維素做成的纖維，其中粘膠纖維是由粘膠法得到的再生纖維素形成的;銅氨纖維是由銅氨法得到的再生纖維素形成的;高濕模量類纖維是通過能形成高強力、高濕模量的方法得到的再生纖維素形成的;脫乙?；柞ダw維是通過纖維素醋酸酯接近完全的脫乙?；玫降脑偕w維素形成的;二醋酯纖維的纖維素大分子中至少74%~92%的羥基被乙?；?三醋酯纖維的纖維素大分子中至少92%的羥基被乙酰化，等等[1][2]。

Since the regenerated cellulose fiber is made by solution spinning, when spinning, the solution is made by wet or dry method, and the shape of spinneret is not unique. It has round, triangular, Y shaped, star shaped, heart-shaped and so on [3]. Even if the shape of spinneret is the same, the fiber cross-section and longitudinal shape will change as a result of spinning conditions. Therefore, the same spinning solution can spin out fibers with different cross-sectional shape and longitudinal shape. Therefore, it is not possible to qualitatively regenerate cellulose fibers based on the shape and longitudinal shape of fibers.

2 Identification and analysis of regenerated cellulose fiber

FZ/T 01057.3-2007 "textile fiber identification test method third part: microscopic method" (principle) is to observe the longitudinal and cross section shapes of unknown fibers by microscope, and to identify the category [4] of unknown fibers according to the standard photographs and morphological descriptions of fibers. The standard lists the cross sectional and longitudinal morphological characteristics of various fibers accordingly in Appendix B, and lists cross-sectional and longitudinal micrographs of various fibers in Appendix C.

The author thinks that in Appendix B and appendix C, except for natural fibers, the description of the cross-sectional and longitudinal features of all kinds of chemical fibers and their micrographs are only one of the various possible appearance forms, which can not be regarded as standard photographs or standard form descriptions.

In fact, for a specific sample, observing the longitudinal or cross-sectional morphology of unknown fibers under microscope, several kinds of unknown fibers (chemical fibers) with different longitudinal or cross section shapes are further identified by chemical reagents. The conclusion concluded may be only a kind of fiber, such as polyester, which is observed directly under microscope.

For synthetic fibers, the final conclusion is what kind of fiber it is.

But for regenerated cellulose fiber, it is necessary to do this with a special method (such as infrared spectroscopy). It is difficult to determine which kind of regenerated cellulose fiber is difficult to use by chemical reagents. Because there are many kinds of regenerated cellulose fibers, and the macromolecular composition is C6H10O5 n, the constituent elements are all carbon, hydrogen and oxygen, but there are some changes in the molecular structure, so there is a vast majority of common properties in the chemical properties, and it is difficult to distinguish between each other with chemical reagents.

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It is considered that: after using chemical reagent to separate the regenerated cellulose fiber (mainly refers to the new type regenerated cellulose fiber such as modal fiber, Lesel fiber and bamboo fiber), after the ordinary viscose fiber, copper ammonia fiber, acetate fiber and three acetate fiber, then the appearance shape (vertical shape and cross section shape) of the regenerated cellulose fiber will be compared with the cross sectional and longitudinal surface characteristics of all kinds of fibers listed in Appendix B of the FZ/T01057.3-2007 "textile fiber identification test method third part: microscope method" and the micrographs of the cross sections and vertical planes of various fibers listed in Appendix C. The names of those who are the same or basically similar can be identified, and the names of specific regenerated cellulose fibers such as modal or Lesel are identified. This is obviously unscientific. Someone

In order to prove its unscientific nature, the author found four modal fibers from a famous large textile mill, one is modal fiber produced in Taiwan, one is modal fiber produced in Austria, one is called new form fiber, the other is modal fiber. These four kinds of modal fibers belong to regenerated cellulose fiber and are all called "modal fiber or new type fiber". The longitudinal shapes of these four kinds of regenerated cellulose fibers are shown in Figures 1, 2, 3, and 4 respectively.

Fig. 1 Austria modal fiber 1

Fig. 2 modal fiber produced in Taiwan

Fig. 3 Shandong new generation fiber

Fig. 4 Austria modal fiber 2

The shape is the same as the groove, but the groove shape, size and number of grooves are different. Even the same modal fiber is also due to the change of the environmental conditions (such as the velocity of the air flow). The appearance of the fiber is different because of the spinning of the spinneret. And each type of fiber is not consistent with or consistent with the cross section and longitudinal shape characteristics of the Dyer fiber, as shown in Appendix B of the third part of the textile fiber identification test method: part FZ/T01057.3-2007: the microscope method (C). From the diagram, we can find that although they belong to modal cellulose fibers, their longitudinal shapes are different from each other.

3 conclusions and recommendations

　　1)有關(guān)部門適時對FZ/T01057.3-2007《紡織纖維鑒別試驗方法第3部分：顯微鏡法》進行修訂，以免給相關(guān)各方造成不必要的困惑和糾紛，如：客戶基于自已產(chǎn)品進入市場后順利銷售的需要，要求在檢測報告中定性具體再生纖維素纖維名稱，如果檢測部門不在報告中定性某種再生纖維素纖維，客戶就會說“在某某檢測部門能定出具體再生纖維素纖維名稱，你們這里為什么不行?”，又如：有的檢測部門給出了具體再生纖維素纖維名稱，且相應(yīng)產(chǎn)品上據(jù)此標(biāo)注為具體的再生纖維素纖維，其他檢測部門在監(jiān)督檢查時，發(fā)現(xiàn)其外觀形態(tài)與FZ/T01057.3-2007《紡織纖維鑒別試驗方法第3部分：顯微鏡法》的附錄B中所列各種纖維的橫截面、縱面形態(tài)特征及附錄C中所列各種纖維的橫截面、縱面形態(tài)顯微照片均不相符，此時該如何判定其纖維成份含量合格與否呢?所以，有關(guān)部門有必要對FZ/T0

1057.3-2007 "textile fiber identification test method third part: microscope method" is revised.

At the time of revision, it is suggested that the natural fiber part should be retained, and only the chemical fiber part should be specified. The specific description is "a special case of the description of all kinds of chemical fiber appearance and microscopic pictures, and no specific chemical fiber has other kinds of appearance."

2) before the FZ/T 01057.3-2007 "textile fiber identification test method third part: microscope method" has not been revised, the relevant departments have made a unified provision in a suitable way: in the inspection report, the inspection departments or organizations in the inspection report can give the regenerated cellulose fiber, except the new regenerated cellulose fiber, the ordinary viscose fiber, the copper ammonia fiber, the acetate fiber and the three acetate fiber, which can be identified in scientific way or with relevant documentary proof, and can give the name of the specific regenerated cellulose fiber, and all other new regenerated cellulose fibers are uniformly characterized as "other regenerated cellulose fibers".

(Note: "other regenerated cellulose fiber" is different from "ordinary viscose fiber, copper ammonia fiber, acetate fiber, three acetate fiber", because according to the "textile fiber identification test method fourth part: dissolution method" (FZ/T01057.4-2007), the copper ammonia fiber, acetate fiber and three acetate fiber zone can be separated by chemical reagents.

3) when manufacturing enterprises or commercial enterprises mark the content of fiber in related products, they can only mark the name of specific regenerated cellulose fibers only if they can confirm and provide relevant documents to the parties concerned, otherwise, label other regenerated cellulose fibers as appropriate.

4) if the testing organization is qualified for testing the content of the fiber content, if the regenerated cellulose fiber is labeled as a specific regenerated cellulose fiber, such as "cotton 30.5%, modal 69.5%", as long as the test results of the fiber content in the sample are cotton and regenerated cellulose fiber, and the content error is within the permitted range, it can be directly qualified according to the "textile fiber content identification" (FZ/T01053-2007), otherwise it is not qualified, for example, the test result is "cotton 28%, other recycled fiber 72%". At this time, according to the "textile fiber content identification" (FZ/T01053-2007), the fiber content is determined to be qualified.

5) as soon as possible, the relevant departments set up a map library of different regenerated cellulose fibers, because each regenerated cellulose is made up of a specific polymer. No matter how the appearance changes, its molecular structure is definite and its atlas is unique.

At the same time, the corresponding effective and widely accepted testing methods should be worked out so as to make the qualitative and accurate consistency of the fibers in the relevant inspection departments or institutions in the country.