羊毛纤维集合体水份含量的测量方法_英文_

西安工程大学学报Journal of Xi’an Polytechnic University　第23卷第2期(总96期)2009年4月Vol.23,No.2(Sum.No.96) Arti cle I D:16712850X(2009)022*******M ethod of test wa ter con ten t of wool f i ber a sse m blyDU Zhao2qun1,Y U W ei2dong1,2,DA I Ya2lan1,WANG Meng2chen1,LOU Q i1,CHEN Xin2yi1(1.Key Laborat ory of Textile Sci.&Tech.(M inistry of Educati on),Donghua Univ.,Shanghai201620,China;2.College of Cl othing and A rt Design,J iaxing University,J iaxing,Zhejiang314001,China)Abstract:A method of measure water content of wool fibre asse mbly quickly was p resented,and the drying oven was modified t o dry fibre assembly by i m p r oving the drying p rinci p le and the weighing way by the weighting sens or.The theory modelling of water content of materials measured was analysed and modelled.The experi m ental had been conducted,and the results existed good accordance with theoret2 ical p redicti on value and can be p redicted by the theoretical model.It is indicated that the method is an effective test method in testing water content of wool fiber asse mble,and the corres ponding method t o p r ovide water content is fast and the test ti m e is no more than10m in.The method is hel pful in de2 signing and celebrating standard method for hydr ophilic behavi or.Key words:fibre asse mble;wool;water contentCLC nu m ber:TS101.921.3 D ocu m en t code:AHydr ophilic p r operty of fiber material p lays an i m portant r ole in ther mo2hydr o comf ortability and st oring and trading of textile materials,which deter m ines the stability of physical p r operties and commercial trade p r ofit.The for mer requires p recise baking ti m e,and the latter needs fast testing of water content.However,general method t o test water content of fiber asse mble is t o adop t oven method,which is ti m e2consu m ing l onger than30m in;or is t o adop t capacit or moisture method,which is easily affected by air conditi on and water distributi on in fibre as2 se mbly[122].The drying oven method is t o bake fire assembly until subtract of t w o neighboring test results is less t o defi2 nite value[324].The method requires at least half an hour t o comp lete a test,which is ti m e2consum ing.However, it is objective and accurate and used as standard method f or measuring moisture content.Actually,the method can be modified s o as t o realize fast measure ment by drying p rinci p le.So the paper is t o modify traditi onal oven method by adding sens or and analyzing moisture vapor p rinci p le.The devel oped method and corres ponding appa2 ratus t o measure water content takes only10m in,which is relatively quicker and i m p r oves the measure ment effi2 ciency.A s far as Hydr ophilic p r operty of fiber material is concerned,the water is liberated fr om fiber asse mbly according t o water distributi on status,which depends on hydr ophilic p r operty of fiber asse mbly.So many re2 Rece i ved da te:2009202221 B i ography:DU Zhao2qun(19812),male,a native of J iujiang city,J iangxi p r ovince,ass ociate p r ofess or of Donghua University.E2mail:duzq@searchers have been conducted theoretical researching work .For natural fiber asse mbly,the water content is rel 2ative high,and water molecular have direct and indirect hydr ophilic bonding with fiber,which consists of t w o or three p r ocess .For cott on fiber asse mbly,water liberating is initially liberated as indirect water f or s mall bonding force .The indirect water liberati on is fast .Then,the second p r ocess is that the direct abs orbing water liberatedgradually f or high hydr ophilic bonding energy [527].Peirce theory exp lained that direct abs orbed water depends onthe hydr ophilic gr oup and has good bonding acti on with fiber macr omolecules;then indirect abs orbed moisturecontinues t o have hydr ophilic with direct abs orbed water in fiber [8].Speakman studied the liberati on of wool fiberasse mbly and f ound the sa me trend,and the difference is that indirect abs orbed water is composed of lateralchain molecular and main chain molecular [9].The common attributes bet w een the t w o theoretical studies includet w o as pects .One is that the liberati on ti m e of direct water of fiber asse mbly is sl ow and that of indirect water is quick .The other is that there exists exponential functi on bet w een residual water with ti m e .So the paper ai m s t o devel op method t o measure water content quickly and t o celebrate the mathe matical model bet w een residual water content and ti m e with a modified apparatus and a method t o test water content of textile p r oducts quickly and accurately .1　Experi m ental111　M a ter i a ls and testsT wo kinds of high hydr ophilic fiber asse mbly sa mp les were selected and balanced f or above 24h under the conditi on in (20±2)℃,(65±3)%RH bef ore testing,and the oven te mperature for wool fiber asse mbly and kapok fiber asse mble sa mp leswere set in drying oven te mperature (105±2)℃f or about 30m in,then,t o weight sa mp le mass every 15m in until subtract of t w o neighboring test results is less t o 0102%.The initial sa mp le were weighted as 10gra m ,and the at m os pheric te mperature is set as (105±2)℃.Then,sa mp le is put int o the oven and sa mp le weight is balanced every 2m in .112　Typ i ca l resi dua l s am ple we i ght curve w ith ti m eWool sa mp le were selected as 10g and put int o the oven at (105±2)℃,and balance every 2m in .The mass balanced in the oven were acquired by the sens or,and the liberated water were acquired fr om the subtract with the t otal mass which were modified according modifying coefficient of mass balanced in the oven and at m os 2phere .The typ ical balanced mass of sa mp le curve with ti m e and liberated water mass curve with ti m e were listed in Figure 1.It is obvi ous that sa mp le weight decrease fast in the initial regi on f or about 5m in,and reaches equi 2librium status in 10m in .Moreover,the fitting exponential functi on bet w een residual sa mp le weight and ti m e shows very high correlati on coefficient as 01996.Theref or,it is feasible t o devel op mathe matical functi on t o p re 2dict moisture regain and t o i m p r ove test ti m e when ti m e is cl ose t o infinity .2　Results and discussi on211　Rel a ti on sh i p between resi dua l ma ss and ti m e of wool f i ber a sse m bly10g mass sa mp le was weighted and put it int o the oven,and balanced fr om 0m in t o 2,4,6,8,10,12,14,16,18,20,22,24and 26m in,res pectively;and the mass balanced with ti m e were shown in Tab .1.It can be seen fr o m Table 1that water liberati on increased quickly in the initial regi on,then sl owly .It is that the indi 2rect water was vapoured firstly and fast,then the direct water was liberated .It was als o shown that there exists exponential functi onal trend bet w een residual balanced mass of sa mp le and ti m e .Moreover,the exponential func 2ti ons were fitted according t o the results and listed in Fig .2.The relative coefficient bet w een residual balanced mass of sa mp le and ti m e reaches as high as 01997,which indicated that the water liberati on fr om fiber asse mbly exists nonlinear exponential functi on .Table 1　Resi dua l s am ple we i ght va lue w ith ti m eTi m e /m in02468101214161820222426W eight/g 101009165914191259114910081928191818881878186818581858185771第2期 Method of test water content of wool fiber asse mbly(a ) (b )Fig .1　Typ ical balance mass of sa mp le weight (a )and liberated water mass (b )curve with ti meFig .2　Wool mass balanced curve with ti m eFig .3　Relative err or curve of water content with ti m e W ater content can be calculated based on the result in26m in,however,it can not increase the efficiency .Thereof,and the p redicti on values of water content basedon the fitting exponential functi on with ti m e cl ose t o infini 2ty were obtained and shown in Fig .3,where err or is oftheoretical value t o experi m ental value .It can be seenfr om Fig .3that relative err or bet w een theoretical and ex 2peri m ental values increases fr om 4m in t o 8m in;then ex 2ists a valley 8m in t o 12m in;finally,it decreases gradual 2ly fr om 12m in t o 30m in .It is obvi ous that the relative er 2r or reaches l owest raging fr om 4m in t o 10m in .It indica 2ted that it is possible t o p redict water content based on theresidual weight with ti m e for a short ti m e not more than 10m in and the relative err or is s maller than 01064.212　Rel a ti on sh i p between resi dua l ma ss and ti m e of Kapok f i ber a sse m blyKapok fiber asse mbly was high hydr ophilic material and water abs or p ti on ability is str ong,and its water con 2tent was als o measured and the residual weight curve with ti m e was illustrated in Fig .4.It can be seen fr om Fig .4that residual weight initially descends very fast and arrives at equilibrium status with the sa me trend as wool fi 2871 西安工程大学学报 第23卷ber asse mbly .It may be exp lained that acti on bet w een water and kapok fiber,which shows t w o phase moisture abs or p ti on according t o Peirce theory .The high relative coefficient of kapok fiber asse mbly bet w een residual mass and ti m e is 01997,which als o p r oves the nonlinear exponential functi on .Moreover,the exponential functi on is obtained by fitting and the relative err or bet w een measured and p redicted residual mass of sa mp le according t o ti m e are calculated and listed in Fig .5.It is obvi ous that the maxi m u m relative err or is 01371%no more than 015%.It can be concluded fr om relati onshi p bet w een residual mass and ti m e of high hydr ophilic material that there exists the sa me trend and functi on t o wool fiber asse mbly and kapok fiber asse mbly .The conclusi ons are hel pful t o analyze other high water content material as cott on and rayon.Fig .4　Typ ical residual sa mp le weight curve of Kapok fiber asse mbly with ti meFig .5　Relative err or curve of water content of Kapok fiberasse mbly with ti m e 213　Rel a ti on sh i between resi dua l ma ss and ti m e ofPET f i ber a sse m blyWool and kapok fiber asse mbly were high hydr ophilicmaterial and water abs or p ti on ability is str ong,and itneeds more ti m e t o find the residual weight trend withti m e .The l ow water content of PET fiber asse mbly was al 2s o measured and the residual weight curve with ti m e wasillustrated in Fig .6.It can be seen fr om Fig 。