| 摘要 |
A method and apparatus for instantaneously measuring the die swell of an extrudate is disclosed. A polymeric material such as a rubber or plastic is extruded at a constant volumetric flow rate. The die swell of the material is determined by (a) measuring the time it takes the extrudate to move a given distance almost immediately after leaving the die. In the preferred arrangement, the said distance is made numerically equal to the extrusion velocity, whereby the measured time is the value of the die swell.
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