PURPOSE: To compensate the variation ion feeding quantity of a liner material without giving bad influence to the sealing characteristic property of a liner for a liner stamp molding device to form stampingly a line on the inner surface of a ceiling wall of a container lid main body made of a synthetic resin.
CONSTITUTION: A stamping tool built-up body 34 which stampingly forms a liner 54 material is equipped with a supporting means 38, and a center punch 40 and an outside sleeve 42, which are fitted to the supporting means 38. The center punch 40 is fitted in the supporting means 38 in a freely vertically movable manner, extending to a specified range. For the center punch 40, a deviating means which deviates the center punch 40 to its lower limit position is arranged. The lower surface of the center punch 40 prescribes the central region of the liner 54. The variation in feeding quantity of the liner 54 material is compensated by raising the center punch 40, resisting to the deviating operation of the deviating means, and varying the thickness of the central region of the liner 54.
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