Making the trumpets is simple: plastic is melted into a mold and then it sets.A small group of women take off the sharp edges to finish off the process.
制造这种喇叭非常简单：塑料被融化制成模型然后安装，一群妇女磨平锋利的边缘，工序完成。
Making the trumpets is simple: plastic is melted into a mold and then it sets. A small group of women take off the sharp edges to finish off the process.
制造这种喇叭非常简单：塑料被融化制成模型然后安装，一群妇女磨平锋利的边缘，工序完成。
So that the plastic can be melted down and re-molded without any discoloration!
使塑料熔化后可重新塑造没有任何变色！
Plus, Bakelite was a thermoset, a plastic that once formed, cannot be melted again.
另外，胶木是一种热固性塑料，一经成型，便不能再次熔化。
A reciprocating screw moves the plastic along this lengthy heating chamber, where the material is melted to a fluid state.
往复螺杆移动塑料沿着这条漫长的加热室，那里的材料融化到流体状态。
A reciprocating screw moves the plastic along this lengthy heating chamber, where the material is melted to a fluid state.
往复螺杆移动塑料沿着这条漫长的加热室，那里的材料融化到流体状态。
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