淀粉基可食性膜擠壓流延制膜工藝研究.pdf

1、山東農(nóng)業(yè)大學(xué)碩士學(xué)位論文淀粉基可食性膜擠壓流延制膜工藝研究姓名：劉鵬飛申請學(xué)位級別：碩士專業(yè)：農(nóng)產(chǎn)品加工及貯藏工程指導(dǎo)教師：董海洲20110615淀粉基可食性膜擠壓流延制膜工藝研究2AbstractWithpreservationoffoodqualitycontinuousimprovementoftherequirementsaswellasincreasedawarenessofenvironmentalprotectionnat

2、uralbiologicalmaterialsmadeofediblefilmsinfoodpackagingbecomeahotresearchfield.Thetraditionalsolutioncastfilmpreparedediblepackagingcouldnotsatisfytheneedsofindustrialproductionduetothelowerproductionefficiency.Inthisart

3、iclethethermoplasticstarchwaspreparedbythemethodofmeltmixtureextrusionthenpreparedbyextrusioncastingediblestarchbasedpackagingmaterials.Themainresultswereasfollows:1.Thesuitablefilmsubstratewastheoxidativeesterificationo

4、fstarchthesuitableadhesivewasthepullulan.2.Themobilityofthethermoplasticstarchwasimprovedeffectivelybyaddingglycerol.Withtheadditionofglycerolincreasedthewaterdissolutiontimetensilestrengthgraduallydecreasedwhiletheelong

5、ationoxygentransmissionratetransmittancewatervappermeabilitygraduallyincreased.Whentheglycerolcontent＜31%thefilmwasbrittleitstensilepropertieswaspowhentheglycerolcontent＞31%thefilmwassofteritstensilestrengthwaslower.Thec

6、onclusionwas:fthebestpropertiesofthestarchfilmthesuitableadditionamountofglycerolwas31%.3.Thetensilestrengthofthestarchfilmwasimprovedeffectivelybyaddingpullulan.Withtheadditionofpullulanincreasedthewaterdissolutiontimeo

7、xygenpermeabilitygraduallydecreased.Lowerwatervappermeabilityhigherwhitenessvalueloweryellownessvaluewereobtainedwiththeadditionofpollutionintherangeof5%～9%.Theopticalmicroscopyanalysisofthefilmsurfacesuggestedthatthepul

8、lulanthestarchcanbefusedbetterbytheadditionofpullulanwith9%.Theconclusionwas:fthebestpropertiesofthestarchfilmtheadditionofpullulanwasbetterwithnomethan9%.4.Themobilityofthethermoplasticstarchthewaterresistanceofthefilms

9、wereimprovedeffectivelybyaddingstearicacid.Withtheadditionofstearicacidincreasedthewaterdissolutiontimetensilestrengthgraduallyincreasedwhiletheelongationwatervappermeabilitygraduallydecreased.Whenthestearicacidcontent＞1