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长期以来,我们的储粮仓库大都采用石油沥青做为地坪的防潮材料。据资料记载:在石油沥青中的3,4-苯并(?)的含量一般在0.1—27mg/kg。粮食长期地与沥青地坪接触,就会受到污染,据有关资料报道:“粮库中直接接触沥青地坪的粮食3,4-苯并(?)的含量达0.97bbP。若高温入库的粮食,被污染的程度就更大。加之沥青紧缺,施工复杂,劳动强度大,并带有一定的危害性,费用高等原因,因此研究既能防潮又无公害的防潮方法和防潮材料,已成为粮食部门急待解决的一个重要课题。曲阜县时庄粮所,一九七八年曾对聚氯乙烯压延薄膜(以下简称塑料布)做过防潮试验,将2公斤大米分装在二个用热合机热合好的塑料布袋中,放入防火缸内长达三个月,取出后经化验水分在有增加。由此,在市、县粮食局的指导帮助下,于一九八一年五月对两座二百二十万斤容量,四百六十二平方米的新建仓房采用山东塑料制品试验厂生产的塑料布做仓库地坪防潮,经过四年的储粮试验,达到了预期的防潮效果,并于一九八五年六月七日通过技术鉴定。
For a long time, most of our grain storage warehouse uses petroleum asphalt as a moisture-proof material for the floor. According to the records, the content of 3,4-benzo (?) In petroleum pitch is generally between 0.1 and 27 mg / kg. According to the data reported: "The content of 3,4-benzo (?) In grains directly contacting the asphalt floor in the grain storage reaches 0.97bbP. If the grain is exposed to the asphalt floor for a long time, it will be polluted. Food, the degree of contamination is even greater. Coupled with the shortage of asphalt, complex construction, labor-intensive, and with a certain degree of harmfulness, high cost reasons, so both moisture and pollution-free moisture-proof methods and moisture-proof materials, has become Food sector an urgent issue to be solved.Qufu County Shizhuang food, in 1978 once polyvinyl chloride calendered film (hereinafter referred to as plastic sheeting) done moisture test, the 2 kg of rice in two Good heat sealing machine good plastic bag, into the fire cylinder for up to three months, after removal by the test of water in an increase.Therefore, in the city and county food bureau guidance and assistance, in 1981 Month on the two 2.2 million kg capacity, 462 square meters of new warehouse using plastic sheeting factory in Shandong Plastic Factory made warehouse floor moisture, after four years of grain storage test, has reached the expected The moisture-proof effect was passed on June 7, 1985 Technical appraisal