| 摘要 |
PROBLEM TO BE SOLVED: To provide a heating and cooling system of a mold in which while generation of a weld line is prevented, cycle time of a product is reduced, and improvement of production efficiency can be achieved at low cost.SOLUTION: As a heating and cooling system of a mold in injection molding in which a melted raw material is charged from a sprue 2 installed at a mold 1 into a cavity 1a in the mold 1 and cured, to thereby produce various products, a hot water circulation circuit A and a cold water circulation circuit B are formed respectively including common lines d1, d2 passing through the sprue 2, and the hot water circulation circuit A or the cold water circulation circuit B is changed over by on-off valves (changeover means) V1-V7, to thereby selectively make hot water or cold water flow from one of these to the sprue 2 through the common lines d1, d2 to heat or cool the sprue 2. |
