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揉搓儀,又稱揉搓試驗儀或Gelbo Tester,是一種專門用于測定柔性包裝材料耐揉搓性能的檢測設(shè)備。該設(shè)備通過機(jī)械手段模擬薄膜、復(fù)合膜等材料在生產(chǎn)、加工、運(yùn)輸及實際使用過程中所遭受的揉搓、折壓、扭轉(zhuǎn)等復(fù)雜物理應(yīng)力,對材料進(jìn)行可控的、重復(fù)的揉搓作用。通過對比揉搓前后試樣在針孔數(shù)量、阻隔性能(如氧氣、水蒸氣透過率)或其他物理性能方面的變化,揉搓儀能夠量化評估材料的抗揉搓性能,為包裝材料的研發(fā)、生產(chǎn)質(zhì)控及應(yīng)用選型提供科學(xué)依據(jù)。
概述
揉搓儀,又稱揉搓試驗儀或Gelbo Tester,是一種專門用于測定柔性包裝材料耐揉搓性能的檢測設(shè)備。該設(shè)備通過機(jī)械手段模擬薄膜、復(fù)合膜等材料在生產(chǎn)、加工、運(yùn)輸及實際使用過程中所遭受的揉搓、折壓、扭轉(zhuǎn)等復(fù)雜物理應(yīng)力,對材料進(jìn)行可控的、重復(fù)的揉搓作用。通過對比揉搓前后試樣在針孔數(shù)量、阻隔性能(如氧氣、水蒸氣透過率)或其他物理性能方面的變化,揉搓儀能夠量化評估材料的抗揉搓性能,為包裝材料的研發(fā)、生產(chǎn)質(zhì)控及應(yīng)用選型提供科學(xué)依據(jù)。該儀器設(shè)計嚴(yán)格符合GB/T 41347、ASTM F392及YY/T 0681.12等國內(nèi)外相關(guān)測試標(biāo)準(zhǔn),廣泛應(yīng)用于食品、藥品、醫(yī)療器械、日化、電子等行業(yè)的包裝質(zhì)量控制領(lǐng)域。
適用樣品
揉搓儀適用于多種柔性及半剛性包裝材料的抗揉搓性能測試,主要包括以下類型:
塑料薄膜與復(fù)合膜:適用于食品、藥品包裝用阻隔透明塑料復(fù)合膜、鋁塑復(fù)合膜、鍍鋁膜、涂層膜、尼龍膜等各類柔性薄膜及復(fù)合結(jié)構(gòu)的材料。
醫(yī)療器械包裝材料:適用于無菌醫(yī)療器械包裝中常用的軟性屏障膜,如醫(yī)用透析紙、特衛(wèi)強(qiáng)(Tyvek)蓋材、塑料復(fù)合膜等材料的抗揉搓性實驗。
紙張與箔材:適用于包裝用紙張、鋁箔等材料的抗揉搓性能測試。
食品藥品及日化包裝材料:可擴(kuò)展應(yīng)用于食品、藥品、日化產(chǎn)品包裝用復(fù)合塑料薄膜、瓶裝標(biāo)簽、輸液袋等包裝組件的耐揉搓性能評估。
測試原理
揉搓儀的測試原理基于模擬材料在實際工況下承受的復(fù)雜力學(xué)損傷。儀器通過伺服電機(jī)驅(qū)動精密機(jī)械傳動機(jī)構(gòu),帶動試樣在被固定狀態(tài)下進(jìn)行多自由度的反復(fù)揉搓動作。其主要工作原理包括:
多應(yīng)力協(xié)同作用:揉搓儀能夠同時模擬材料所承受的折痕、拉伸、扭曲和壓縮等多種應(yīng)力,真實再現(xiàn)材料在運(yùn)輸、搬運(yùn)及使用過程中可能遇到的揉搓和折壓行為。揉搓過程同時包含軸向運(yùn)動和扭轉(zhuǎn)運(yùn)動,對試樣進(jìn)行往復(fù)的彎曲和擠壓。
定量化模擬與評估:通過設(shè)定揉搓頻率、揉搓角度(如440°或400°)及水平行程(如155mm或80mm),實現(xiàn)揉搓過程的定量化模擬。測試結(jié)束后,通過檢測揉搓前后試樣針孔數(shù)量的變化(如染色松節(jié)油法),或測量其阻隔性能(如氧氣透過率、水蒸氣透過率)的衰減程度,量化評估材料的耐揉搓性能。
測試標(biāo)準(zhǔn)
揉搓儀的設(shè)計、制造與使用嚴(yán)格遵循以下國內(nèi)外相關(guān)標(biāo)準(zhǔn),確保了測試方法的規(guī)范性和結(jié)果的可比性:
GB/T 41347-2022《柔性包裝材料耐揉搓性能的測試方法》:中國國家標(biāo)準(zhǔn)(推薦性)。該標(biāo)準(zhǔn)于2022年3月9日發(fā)布,2022年10月1日正式實施,由全國包裝標(biāo)準(zhǔn)化技術(shù)委員會歸口。文件規(guī)定了測試柔性包裝材料耐揉搓性能的方法,提供了“定量+定性”的測試驗證方法,適用于柔性包裝材料耐揉搓性能的測試。
YY/T 0681.12-2022《無菌醫(yī)療器械包裝試驗方法 第12部分:軟性屏障材料抗揉搓性》:中國醫(yī)藥行業(yè)標(biāo)準(zhǔn),由國家藥監(jiān)局發(fā)布。該文件規(guī)定了軟性屏障材料抗揉搓性的試驗方法,替代了上一版(YY/T 0681.12-2014),適用于軟性屏障材料抗揉搓性的測試。
ASTM F392/F392M《撓性阻擋層材料耐撓曲度的標(biāo)準(zhǔn)試驗方法》:美國材料與試驗協(xié)會制定的國際通用標(biāo)準(zhǔn),旨在測定軟包裝材料(柔性阻擋層材料)對彎曲形成的針孔故障的抵抗力。其在確定彎曲對阻隔性能(如氣體和/或濕氣透過率)等影響方面具有價值,是國際上廣泛應(yīng)用于評價材料耐彎曲疲勞性能的核心方法之一。
GB/T 40266-2021《食品包裝用氧化物阻隔透明塑料復(fù)合膜、袋質(zhì)量通則》:涉及食品包裝用復(fù)合膜的物理機(jī)械性能檢測規(guī)范。
儀器特征
現(xiàn)代揉搓儀普遍具備以下技術(shù)特征,以滿足高精度及多樣化的檢測需求:
高精度測控系統(tǒng):采用PLC工業(yè)控制系統(tǒng),配合精密滾珠絲杠和伺服電機(jī),確保測試過程的穩(wěn)定性和數(shù)據(jù)的高精度。試驗速度、揉搓角度、水平行程等關(guān)鍵參數(shù)均可精確控制。
智能化操作平臺:配備7英寸HMI人機(jī)界面觸摸屏,操作直觀、簡單,可方便地選擇預(yù)置的測試標(biāo)準(zhǔn)模式(通常內(nèi)置五種以上標(biāo)準(zhǔn)實驗?zāi)J剑崟r監(jiān)控測試狀態(tài)。
多功能測試模式:支持長行程與短行程之間的快速切換,適應(yīng)不同材料及標(biāo)準(zhǔn)的測試要求。揉搓頻率通常設(shè)定為45次/分鐘。
多工位設(shè)計:提供三工位及四工位測試機(jī)型可選,支持同時測試多個試樣,提高檢測效率。注:多個試樣會平分拉壓力和旋轉(zhuǎn)扭矩。
數(shù)據(jù)輸出功能:內(nèi)置微型打印機(jī),可即時打印測試報告。可選配計算機(jī)軟件,進(jìn)行數(shù)據(jù)存儲、分析和報告生成。
安全保護(hù)機(jī)制:配置限位保護(hù)、過載保護(hù)及緊急制動功能,確保操作及運(yùn)行安全。
使用方法
揉搓儀的基本操作流程一般包括以下幾個步驟:
測試前準(zhǔn)備:檢查儀器水平與各部件狀態(tài),確保清潔無異物。開啟電源,儀器預(yù)熱至穩(wěn)定狀態(tài)。
參數(shù)設(shè)置:在觸摸屏上根據(jù)測試標(biāo)準(zhǔn)(如ASTM F392)或特定方法,設(shè)置揉搓頻率(通常為45次/分鐘)、揉搓角度(440°或400°)、水平行程(155mm或80mm)、揉搓次數(shù)及試驗?zāi)J剑ˋ-F級別)。
試樣安裝:將裁剪成規(guī)定尺寸(如280mm × 200mm)的試樣平展地安裝在固定夾具與移動夾具之間,確保試樣無褶皺并牢固夾緊。
執(zhí)行測試:關(guān)閉安全防護(hù)罩,啟動測試程序。儀器將按照預(yù)設(shè)參數(shù)對試樣進(jìn)行自動揉搓,直至達(dá)到設(shè)定次數(shù)。
結(jié)果評估:取下試樣,采用染色松節(jié)油涂刷法觀察并統(tǒng)計針孔數(shù)量,或使用氣體透過率測試儀等設(shè)備檢測揉搓后試樣阻隔性能的變化。
記錄與清理:打印或保存測試結(jié)果,清理夾具及儀器表面的殘留物。
維護(hù)保養(yǎng)
日常清潔:每次測試后,用軟布清潔夾具、導(dǎo)軌及儀器表面,去除測試碎屑,防止異物影響機(jī)械精度。
運(yùn)動部件保養(yǎng):定期檢查絲桿、導(dǎo)軌等運(yùn)動部件,確保潤滑良好,并根據(jù)設(shè)備說明書加注適量專用潤滑脂。
夾具檢查:定期檢查夾具夾持面是否平整、有無磨損,確保在測試過程中能牢固夾持試樣而不致滑脫。
傳感器與電機(jī)保護(hù):避免超量程使用,防止設(shè)備空載高速運(yùn)行,嚴(yán)禁在機(jī)器運(yùn)行時強(qiáng)行觸碰運(yùn)動部件。
環(huán)境管理:儀器應(yīng)置于清潔、干燥、無振動的環(huán)境中,避免陽光直射和溫度劇烈波動。
校準(zhǔn)方法與周期
校準(zhǔn)方法:
速度/頻率校準(zhǔn):使用秒表等計時工具,測量實際揉搓頻率是否與設(shè)定值(如45次/分鐘)相符。
角度/行程校準(zhǔn):使用標(biāo)準(zhǔn)量角器或卡尺,驗證揉搓角度(440°/400°)及水平行程(155mm/80mm)的準(zhǔn)確度。
力值/扭矩校準(zhǔn):使用標(biāo)準(zhǔn)測力儀驗證設(shè)備的拉壓力及旋轉(zhuǎn)扭矩數(shù)據(jù),確保其在允許誤差范圍內(nèi)。
計量規(guī)范依據(jù):設(shè)備的校準(zhǔn)方法可參考《JJG 475 電子式萬能試驗機(jī)檢定規(guī)程》中的通用要求執(zhí)行。
校準(zhǔn)周期:
建議周期為12個月,由具備資質(zhì)的計量機(jī)構(gòu)執(zhí)行。
期間核查:建議每月使用標(biāo)準(zhǔn)參考材料進(jìn)行性能核查,確保儀器狀態(tài)穩(wěn)定。
特殊情形:儀器經(jīng)過維修、搬運(yùn)或?qū)y試結(jié)果產(chǎn)生疑問時,應(yīng)及時進(jìn)行校準(zhǔn)。
常見故障與排除方法
重要提示:以上內(nèi)容基于通用技術(shù)規(guī)范和行業(yè)標(biāo)準(zhǔn)。在實際應(yīng)用中,應(yīng)嚴(yán)格遵守GB/T 41347-2022《柔性包裝材料耐揉搓性能的測試方法》、YY/T 0681.12-2022《無菌醫(yī)療器械包裝試驗方法 第12部分:軟性屏障材料抗揉搓性》及ASTM F392等相關(guān)標(biāo)準(zhǔn)的最新版本規(guī)定。所有測試儀器需處于有效的校準(zhǔn)狀態(tài),并由經(jīng)過培訓(xùn)的操作人員執(zhí)行標(biāo)準(zhǔn)操作規(guī)程。
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