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聚乙烯热收缩膜工艺
影响聚乙烯热收缩薄膜成型和使用性能的原料因素，主要包括树脂密度、熔体指数和分子量分布。
The raw material factors affecting the moulding and service performance of heat shrinkable polyethylene film mainly include resin density, melt index and molecular weight distribution.
一般说来，较低的密度能改进薄膜的热合性，而较高的密度可提高薄膜的刚性，冲击强度和撕裂强度，但其热收缩性略有下降。这主要是由于结晶熔点较高所致，可通过变更吹胀比或牵引比来加以弥补。经验证明，最佳树脂密度为0.918～0.924。
Generally speaking, lower density can improve the thermal bonding of thin films, while higher density can improve the rigidity, impact strength and tear strength of thin films, but its thermal shrinkage decreases slightly. This is mainly due to the higher melting point of crystallization, which can be compensated by changing the blowing ratio or traction ratio. Experience has proved that the optimum resin density is 0.918-0.924.
树脂的熔体指数小，分子量高，分子之间的缠结点多，薄膜的冲击强度和收缩应力大。通常熔体指数(M1)为0.3～1.0的原料是适宜的。熔体指数最好不要超过5，否则薄膜的收缩应力会明显下降，而且纵横两向的收缩性不易均衡。
The resin has low melt index, high molecular weight, many intermolecular entanglement points, and high impact strength and shrinkage stress. Usually, raw materials with melt index (M1) of 0.3-1.0 are suitable. Melt index should not exceed 5. Otherwise, the shrinkage stress of the film will decrease obviously, and the shrinkage in both directions is not easy to be balanced.
具体地说，根据包装用途不同，可将熔体指数分为三类：
Specifically, the melt index can be divided into three categories according to different packaging uses:
MI<0.6，适于重货和托盘货物的收缩包装;
MI < 0.6, suitable for shrinkage packaging of heavy cargo and pallet cargo;
MI在0.6~1之间，适于轻包装物的收缩包装;
MI ranges from 0.6 to 1, which is suitable for shrinkage packaging of light packages.
MI>1.0，适于对强度和收缩要求不高的收缩包装。
MI > 1.0, suitable for shrinkage packaging with low strength and shrinkage requirements.
分子量分布窄的树脂所生产的薄膜，收缩温度低;反之，收缩温度高。另外，分子链的支化度对薄膜的拉伸特性影响很大。据说，将文化度小于10(MI为0.5～3.0)与支化度为10～30的树脂进行混炼，可使薄膜的拉伸性能得到很大提高。支化度大于10，对改善拉伸性能效果不大明显。而支化度等于10，则薄膜在高温下的拉伸性能很不理想。
The film produced by resin with narrow molecular weight distribution has low shrinkage temperature, whereas the shrinkage temperature is high. In addition, the branching degree of the molecular chain dibanhw.37ix.com.cnbianyaqisx.37ix.com.cnmojuhp.37ix.com.cn mojujcj.37ix.com.cn mojugsn.37ix.com.cnmojuly.37ix.com.cnhas a great influence on the tensile properties of the films. It is said that the tensile properties of films can be greatly improved by mixing resins with less than 10 degree of culture (MI 0.5-3.0) and 10-30 degree of branching. The branching degree is more than 10, which has little effect on improving the tensile properties. When the branching degree is equal to 10, the tensile properties of the films at high temperature are not ideal.
The raw material factors affecting the moulding and service performance of heat shrinkable polyethylene film mainly include resin density, melt index and molecular weight distribution.
一般说来，较低的密度能改进薄膜的热合性，而较高的密度可提高薄膜的刚性，冲击强度和撕裂强度，但其热收缩性略有下降。这主要是由于结晶熔点较高所致，可通过变更吹胀比或牵引比来加以弥补。经验证明，最佳树脂密度为0.918～0.924。
Generally speaking, lower density can improve the thermal bonding of thin films, while higher density can improve the rigidity, impact strength and tear strength of thin films, but its thermal shrinkage decreases slightly. This is mainly due to the higher melting point of crystallization, which can be compensated by changing the blowing ratio or traction ratio. Experience has proved that the optimum resin density is 0.918-0.924.
树脂的熔体指数小，分子量高，分子之间的缠结点多，薄膜的冲击强度和收缩应力大。通常熔体指数(M1)为0.3～1.0的原料是适宜的。熔体指数最好不要超过5，否则薄膜的收缩应力会明显下降，而且纵横两向的收缩性不易均衡。
The resin has low melt index, high molecular weight, many intermolecular entanglement points, and high impact strength and shrinkage stress. Usually, raw materials with melt index (M1) of 0.3-1.0 are suitable. Melt index should not exceed 5. Otherwise, the shrinkage stress of the film will decrease obviously, and the shrinkage in both directions is not easy to be balanced.
具体地说，根据包装用途不同，可将熔体指数分为三类：
Specifically, the melt index can be divided into three categories according to different packaging uses:
MI<0.6，适于重货和托盘货物的收缩包装;
MI < 0.6, suitable for shrinkage packaging of heavy cargo and pallet cargo;
MI在0.6~1之间，适于轻包装物的收缩包装;
MI ranges from 0.6 to 1, which is suitable for shrinkage packaging of light packages.
MI>1.0，适于对强度和收缩要求不高的收缩包装。
MI > 1.0, suitable for shrinkage packaging with low strength and shrinkage requirements.
分子量分布窄的树脂所生产的薄膜，收缩温度低;反之，收缩温度高。另外，分子链的支化度对薄膜的拉伸特性影响很大。据说，将文化度小于10(MI为0.5～3.0)与支化度为10～30的树脂进行混炼，可使薄膜的拉伸性能得到很大提高。支化度大于10，对改善拉伸性能效果不大明显。而支化度等于10，则薄膜在高温下的拉伸性能很不理想。
The film produced by resin with narrow molecular weight distribution has low shrinkage temperature, whereas the shrinkage temperature is high. In addition, the branching degree of the molecular chain dibanhw.37ix.com.cnbianyaqisx.37ix.com.cnmojuhp.37ix.com.cn mojujcj.37ix.com.cn mojugsn.37ix.com.cnmojuly.37ix.com.cnhas a great influence on the tensile properties of the films. It is said that the tensile properties of films can be greatly improved by mixing resins with less than 10 degree of culture (MI 0.5-3.0) and 10-30 degree of branching. The branching degree is more than 10, which has little effect on improving the tensile properties. When the branching degree is equal to 10, the tensile properties of the films at high temperature are not ideal.
