| 摘要 |
PURPOSE: To improve a quality of a product and to prevent wastes of a material and a fatigue by suitably controlling a bubble injection size in the case of multiple injecting for a variable predetermined time in a job site bubbling apparatus of a polyurethane. CONSTITUTION: The timer for controlling a preparation head operation of a bubbling apparatus comprises a preparation head operating to prepare an injection of a bubble forming material for bubbling, and a microprocessor control programmable timer connected to the head and having a capability of operating to control an operation of the head in a manual, automatic or program operating mode to prepare a bubble forming material via a multiple injection of the material having the same or different predetermined time. |
