| 摘要 |
PROBLEM TO BE SOLVED: To provide a mixing head with a capability of directly measuring liquid plastic components to be discharged into a mixing chamber. SOLUTION: One liquid plastic component is injected into the mixing chamber 70 from a jet aperture 46 of a discharge nozzle 36 by moving a discharge control shaft 102 to open the jet aperture 46 of the discharge nozzle 36. On the other hand, the liquid plastic component supplied to a supply aperture 50 of the discharge nozzle 36 from a first supply channel 32 flows to a first feedback path 98, a circulation nozzle 82 and a shaft part feedback path 74 in that order from a feedback aperture 100 of the discharge nozzle 36 by moving the discharge control shaft 102 to the opposite side to the described side, then blocking the jet aperture 46 of the discharge nozzle 36 and making the shaft part feedback path 74 communicate with the first feedback path 98. Thus the liquid plastic component does not flow through the jet aperture 46 and therefore no chemical reaction between the liquid plastic component and the other liquid plastic component occurs, even when the latter remains in the mixing chamber 70. Consequently, the liquid plastic component to be discharged into the mixing chamber 70 can be directly measured.
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