所有(you)進出(chu)口包(bao)裝箱(xiang)必須(xu)要(yao)有(you)真(zhen)空(kong)(kong)包(bao)裝，其工藝特點為工件與木箱(xiang)之間(jian)增加一(yi)只真(zhen)空(kong)(kong)包(bao)裝套，通常(chang)為鋁泊(bo)紙，并(bing)加上幾(ji)層緩沖材料，真(zhen)空(kong)(kong)包(bao)裝是(shi)將(jiang)包(bao)裝袋內抽成(cheng)低真(zhen)空(kong)(kong)后(hou)(hou)，再行封口。經(jing)真(zhen)空(kong)(kong)包(bao)裝后(hou)(hou)的產品可縮小(xiao)體(ti)積；使包(bao)裝物品達到防(fang)潮、防(fang)霉(mei)、防(fang)污染、防(fang)氧(yang)化、防(fang)銹(xiu)的目(mu)次。目(mu)前(qian)國際運(yun)輸多為海運(yun)，一(yi)般在海上漂泊(bo)時(shi)間(jian)為10~50天。因各地(di)濕度(du)、溫度(du)不(bu)同(tong)，同(tong)時(shi)各大洋內濕度(du)較(jiao)大，工件極容易生(sheng)(sheng)銹(xiu)，故它是(shi)一(yi)種切實(shi)有(you)效，行之可行的長途防(fang)生(sheng)(sheng)銹(xiu)措施。