Goodyear spent another four years, in which things went very badly with him, before he made the discovery how to vulcanize rubber completely.
固特异又化了四年的时间，在这四年中，霉运一直跟着它，直到发现如何使橡胶完全硫化的方法。
Special silicon screw, screw chamber, machine head, dies to protect inside vulcanize structure.
硅胶专用螺杆、螺筒、机头、眼模及配套防止内部硫化结构。
Special silicon screw, screw chamber, machine head, dies to protect inside vulcanize structure.
硅胶专用螺杆、螺筒、机头、眼模及配套防止内部硫化结构。
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