多年来，玻璃熔融工艺都是通过高于玻璃熔点的横烧火焰所产生的辐射能来加热玻璃的。

For a number of years, glass melting technologies have been based on heating glass with the radiant energy from flames fired horizontally above the melt.

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将玻璃管加热到能弯曲的程度。

Heat the glass tube to the point that it can bend.

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若所有材料以玻璃转变温度进行加热，那就再不能进行折叠了。

If all of the material is heated to the glass transition temperature, no folding will occur.

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