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    Process for producing a resin film based on a copolymer of ethylene and vinyl acetate
    8.
    发明授权
    Process for producing a resin film based on a copolymer of ethylene and vinyl acetate 失效
    基于乙烯和乙酸乙烯酯的共聚物制备树脂膜的方法

    公开(公告)号：US5601778A

    公开(公告)日：1997-02-11

    申请号：US477631

    申请日：1995-06-07

    申请人： Claude Dehennau ,  Serge Dupont ,  Martin Vonk

    发明人： Claude Dehennau ,  Serge Dupont ,  Martin Vonk

    IPC分类号： B29C47/86

    CPC分类号： B29C47/86 ,  B29C47/864 ,  B29C47/0026

    摘要： The relationship between the average degree of roughness of the faces of rough appearance, expressed in microns, and the percentage by weight of units derived from vinyl acetate in the copolymer of which the film consists is greater than 0.019.The film is extruded in the form of an extruded sleeve which is cooled in the die by a circulation of a coolant fluid whose temperature T satisfies the relationship: ##EQU1## in which Tc is the temperature at which the Napierian logarithm of the relationship between the length at break and the initial length of a test specimen of the copolymer has a value of 87% of its value at 180.degree.Tm is the mean temperature of the copolymer as it leaves the diea is equal to 0.24G is given by the relationship .rho..times.Cp.times.V.times.H.sup.2 /.lambda..times.Lin which.rho. is the density of the copolymerCp is the specific heat of the copolymerV is the mean flow velocity of the copolymer through the extrusion dieH is the height of the gap between the core and the extrusion die.lambda. is the thermal conductivity of the copolymerL is the length of the cooling zonen is equal to 0.1688A is equal to -0.0148Ld is the distance between the end of the cooling zone and the end of the dieB is equal to 0.2175.The film is particularly suitable for the production of packaging bags especially for medical products.

    摘要翻译： 粗糙外观的平均粗糙度（以微米表示）和由膜组成的共聚物中衍生自乙酸乙烯酯的单元的重量百分比之间的关系大于0.019。 该薄膜以挤出套筒的形式挤出，该模具通过温度T满足以下关系的冷却剂流体的循环而在模具中冷却：其中Tc是温度T的关系的内皮尔对数 共聚物的断裂长度和试样的初始长度在180°的值为其值的87％Tm是共聚物在离开模具时的平均温度a等于0.24 G由关系式给出 rho xCpx + E，rar V + EE xH2 /λxL其中rho是共聚物Cp的密度Cp是共聚物的比热+ E，rar V + EE是通过挤出模具H的共聚物的平均流速 是核心与挤出模头之间的间隙的高度λ是共聚物的热导率L是冷却区的长度n等于0.1688A等于-0.0148 Ld是冷却结束之间的距离 模具B的端部等于0.2175 。 该片特别适用于生产包装袋，尤其适用于医疗产品。