The results show that the extensional flow of melt in convergent die results in intense entrance elastic effect and distinct extrusion swell in conical die with different angles.
结果表明，不同角度圆锥口模挤出过程中，熔体在收敛流道受到拉伸流变，导致强烈的入口弹性效应，表现出熔体在不同角度圆锥口模挤出时有不同的挤出胀大比。
The effect of the technology and equipment, such as the structure and dimension of die plates, the extrusion conditions and so on, on the die swell and shrinkage of tread extrudate was described.
阐明影响挤出胎面膨胀和收缩的主要工艺及设备因素是口型板的结构和尺寸、挤出条件以及设备。
The variation of swell stress shows that with the increase of swell stress, the diffusion of water in GCL will be restrained, and water penetration stopped, so GCL has a water-proofing effect.
膨胀应力的分阶段变化表明：膨胀应力的增加会阻止水在GCL中扩散，进而抑制水渗透，达到防水效果。
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