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手機：15923289911<br> 投訴：13996185400<br> 郵箱：1369768490@qq.com<br> 地址：重慶市-江津區 </div> </div> </div> <div id="nxf5n5f" class="ct2-mn"> <div id="rrzlt9h" class="sub-tit"><div id="rxhtbnz" class="curmbs"> <span>您的位置：</span> <a href="/">正茂首頁(yè)</a> / <a href="/News/" title="新聞資訊">新聞資訊</a> / <a href="/list/7/" title="行業(yè)資訊">行業(yè)資訊</a></div>行業(yè)資訊</div> <div id="fjzzflt" class="content-body"> <div id="9f9jpvd" class="content-title"> <h1>可接觸食品塑料制品的分類(lèi)與注意事項</h1> <p> <span>時(shí)間：2022-04-22 11:25:50</span> <span>人氣：296次</span> </p> </div> <div id="x5rv5fn" class="ui-show-image"> </div> <div id="9h5xf5z" class="content-body"> <p><span>塑料是以合成或天然高分子化合物為基本成分，其中以合成樹(shù)脂為基礎成分的居多。除基礎聚合物外，塑料一般還會(huì )含有一些輔料，如填料、增塑劑、著(zhù)色劑等。</span></p><p><span>塑料根據其受熱后的性能變化，分為熱塑性和熱固性塑料，食品接觸產(chǎn)品的加工成型也主要根據這種性能采用不同的工藝方法。</span></p><p><span>熱塑性塑料：以熱塑性樹(shù)脂為基本成分，具有受熱后軟化、冷卻后硬化、可反復塑制的特性。熱塑性塑料中，聚合物分子一般為鏈狀的線(xiàn)型結構，加熱時(shí)軟化流動(dòng)，冷卻變硬的過(guò)程是物理變化，不產(chǎn)生化學(xué)結構上的質(zhì)變。</span></p><p><span>熱固性塑料：以熱固性樹(shù)脂為基本成分，在經(jīng)過(guò)一次受熱軟化（或熔化）和冷卻凝固后，形成不溶不熔的狀態(tài)。熱固性樹(shù)脂在固化前是線(xiàn)型或帶支鏈的結構，當加熱到一定程度時(shí)產(chǎn)生交聯(lián)反應，形成三維網(wǎng)狀結構的體型高分子化合物，從而變得堅硬。這種變化是不可逆的，成型后再次受熱不會(huì )軟化，如強熱則被分解破壞，不可反復塑制。</span></p><p><span>常用熱塑性塑料：聚乙烯（PE）、聚丙烯（PP）、聚氯乙烯（PVC）、聚苯乙PS）、聚偏二氯乙烯（PVDC）、聚甲醛（POMI）、聚碳酸酯（PC）、聚酰胺（PA）、聚丙烯酸酯、聚砜（PU）、聚對苯二甲酸乙二醇酯（PET）、聚苯醚、丙烯腈苯乙烯－丁二烯共聚物（ABS）、丙烯－苯乙烯共聚物（AS）和各類(lèi)烯烴共聚物等。</span></p><p><span>常用熱固性塑料：環(huán)氧樹(shù)脂、氨基樹(shù)脂、不飽和聚酯（UP）樹(shù)脂等。氨基樹(shù)脂中的三聚氰胺－甲醛（MF）和脲醛（UF）就是通常所稱(chēng)“密胺餐具”或“仿瓷餐具”的主要原料。常見(jiàn)的食品接觸塑料制品大部分以熱塑性塑料為原料。</span></p><p><span>食品接觸材料，指的是正常使用中會(huì )接觸到食品的材料及制品，其中除了包括各類(lèi)食品包裝、餐具、廚具、加工設備之外，也包括用于這些產(chǎn)品和材料的粘結劑、印刷油墨著(zhù)色劑等輔助材料。</span></p><p><span>食品接觸材料的質(zhì)量往往能直接影響到食品的質(zhì)量，合適的材料可以保護食品不受污染，在運輸途中不受損壞，保持食品本身的水分、成份、品質(zhì)等特性不發(fā)生改變；而質(zhì)量低劣或者不合適的材料，非但無(wú)法對食品起到保護作用，其本身材料中的有害物質(zhì)還可能遷移到食品中，最終對人體健康造成危害。</span></p><p><span>食品級塑料可以直接接觸食品，其中的塑化劑、著(zhù)色劑含量都符合國家相關(guān)標準，不會(huì )大量釋放有害物質(zhì)。日常生活中，使用食品級塑料所制的塑料袋，并不會(huì )危害健康。但要注意，高溫對塑料中的多環(huán)芳烴類(lèi)致癌物的釋放有影響，溫度越高，相同時(shí)間內的釋放量越大。因此，建議不要用塑料袋長(cháng)時(shí)間盛裝高溫食物，比如剛出鍋的油條、炸雞等。</span></p><p><span> 還有一種關(guān)于外賣(mài)的說(shuō)法是黑色塑料制品是用回收的廢塑料做的，黑色塑料制品會(huì )污染食物。其實(shí)塑料制品是否會(huì )危害健康與顏色的關(guān)系不大。塑料制品所呈現出來(lái)的顏色，取決于在生產(chǎn)過(guò)程中添加的色母。色母是一種新型的高分子材料專(zhuān)用著(zhù)色劑。使用何種色母染色取決于客戶(hù)需求，其生產(chǎn)的塑料制品并不會(huì )導致人體中毒。</span></p> </div> <div id="95ntd9z" class="ui-show-tags"> </div> <ul class="content-exp"> <li>上一篇： <a href="/News/1180.html" title="長(cháng)沙縣星沙街道：實(shí)施垃圾分類(lèi) 打好撤桶并點(diǎn)＋廂房運行組合拳">長(cháng)沙縣星沙街道：實(shí)施垃圾分類(lèi) 打好撤桶并點(diǎn)＋廂房運行組合拳</a> </li> 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