所有進出口(kou)包裝(zhuang)箱(xiang)必(bi)須要有真空(kong)(kong)(kong)包裝(zhuang)，其工(gong)(gong)藝特點為(wei)(wei)工(gong)(gong)件(jian)(jian)與木箱(xiang)之間增(zeng)加(jia)一只(zhi)真空(kong)(kong)(kong)包裝(zhuang)套，通常(chang)為(wei)(wei)鋁(lv)泊紙，并加(jia)上(shang)(shang)幾層緩沖(chong)材料，真空(kong)(kong)(kong)包裝(zhuang)是將包裝(zhuang)袋內(nei)抽成低真空(kong)(kong)(kong)后(hou)，再行(xing)封(feng)口(kou)。經真空(kong)(kong)(kong)包裝(zhuang)后(hou)的產品可縮小體(ti)積；使包裝(zhuang)物品達(da)到防(fang)(fang)潮、防(fang)(fang)霉、防(fang)(fang)污染、防(fang)(fang)氧化、防(fang)(fang)銹的目(mu)次。目(mu)前國(guo)際(ji)運輸多為(wei)(wei)海運，一般在海上(shang)(shang)漂泊時間為(wei)(wei)10~50天。因各地濕(shi)度、溫度不同，同時各大洋內(nei)濕(shi)度較大，工(gong)(gong)件(jian)(jian)極(ji)容易生(sheng)銹，故它是一種切實有效，行(xing)之可行(xing)的長途防(fang)(fang)生(sheng)銹措施。