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The upper mold section 27 also includes a cylindrical mold cavity 40 whose diameter is the same as that or the cavity 28 of the lower mold section 26. Surrounding the lower end of the cavity 40 are a helical surface 41 and an oppositely inclined surface 42 which form the lower edge of the upper mold section 27. This lower edge is complimentarily shaped to close in registry with the upper surface of the lower mold section 26. At the inside edge of the helical surface 41 is a helical groove or projection 43 which forms the upper half of the thread 11 of the article 10. The thread projection 43 closes with the lower thread projection 34 to form a helical thread mold, stopping short of the angled surface 42 for reasons discussed above. The upper and lower mold sections 27 and 26 must of course fit together in tight registry along the surfaces 41, 42, 32 and 33 in order to prevent the leakage of molten molding material while high pressure injection molding is taking place. Similary, the two thread projection halves 43 and 34 should closely match one another in order to correctly form the vial thread 11.
In operation of the mold 25, the two mold sections 27 and 26 are first brought together (in an injection molding press, not illustrated) as shown in FIG. 4 by dashed lines indicating the upper mold section 27. After the mold has been clamped shut and while it continues to be clamped shut, molten plastic is injected into the mold cavity through the gate 29. Significantly, the only mold closing and clamping force required is in an axial direction relative to the vial mold. This is in contrast to a "cam action" type mold as discussed above. Injection is usually accomplished with a plunger or a plasticizing screw positioned in the injection molding machine to travel in a direction parallel to and generally coaxial to the direction of the closure of the mold 25.
The above described preferred embodiment provides a mold and a molded article which significantly lower the cost of producing such an article by utilizing a less expensive mold, allowing the use of more cavities in a particular platen area, and being able to operate at a higher speed per cavity. Various other embodiments and changes to this preferred embodiment will be apparent to those skilled in the art and may be made without departing from the spirit and scope of the following claims.
What I claim is
A mold for forming an article having a male thread, comprising:
a lower mold section comprised of a cavity having a neck portion of a cylindrical shape, the upper end of said lower section having a peripheral edge defining a helically shaped portion subtending an angle of less than 3600 and including a pair of end points obliquely spaced from one another, said peripheral edge further including a portion extending between said end points, said helically shaped portion having a larger diameter than the surrounding areas to form a half male thread; and an upper mold section adapted to close in registry with the lower mold section, comprising a cavity having a neck portion shaped according to the neck portion of the lower mold section, the lower end of said upper mold section having a peripheral edge similar to and complementary with the peripheral edge of the lower mold section;said first and second mold sections, when together in registry, forming a helical male thread mold subtending an angle of less than 36000 and having a partingline following the maximum diameter of the helical male thread.
螺纹模具摘要: 一种模塑成型品被公开，它可以是一个容器，具有圆柱形部相邻的一端，包括一个螺旋形的阳螺纹不完全包围筒状部，具有彼此间隔开的倾斜的线的两端。在制造制品切口大致垂直于所述圆筒部的轴，所述螺旋螺纹的最大直径以下并且从线程到other.The模具的一端通过倾斜使用的模具的分型线可以在使用注塑机。
螺纹模具
本发明涉及模塑，包括注塑，并且更具体地涉及在物品上的阳螺纹颈部的模制，例如一个容器。