The present disclosure provides a method of manufacturing a battery cell cover coupled to a battery cell, the method including: injecting an injection-molded product into a mold at a predetermined injection pressure (P.sub.M), discharging the gas or air within a cavity at a predetermined discharge pressure (P.sub.a) with a predetermined time difference while the injection-molded product is filled in the cavity within the mold; and curing the injection-molded product filled within the mold and separating a cured product in which the injection-molded product is cured.

An inflation needle, its mold and method of manufacturing same are provided. The inflation needle (10) includes a hollow cylindrical probe (12); a hollow conic base (14) disposed at one end of the hollow cylindrical probe (12); a hollow externally threaded member (16) projected out of the hollow conic base (14), the hollow externally threaded member (16) being distal the hollow cylindrical probe (12) and communicating therewith; and a plurality of handles (18) disposed on an outer surface of the hollow conic base (14).

A molding die for molding, on a surface of a plate-like base material, an endless-shaped gasket made of an elastic material includes a cavity which is formed on the opposing surface opposed to the surface of the base material and corresponds to the shape of the gasket, a gate for introducing a molding material which is cured to become an elastic material, a first intermediate portion connecting a gate opening and the cavity and a cross section along the base surface has an area equal to or larger than an opening area of the gate opening, a vent discharging gas unnecessary for molding, and a second intermediate portion connecting an opening on the cavity portion side of the vent extending along the base surface and the cavity and a cross section along the base surface has a cross-sectional area equal to or larger than an area of the gate opening.

A molding die for molding, on a surface of a plate-like base material, an endless-shaped gasket made of an elastic material includes a cavity which is formed on the opposing surface opposed to the surface of the base material and corresponds to the shape of the gasket, a gate for introducing a molding material which is cured to become an elastic material, a first intermediate portion connecting a gate opening and the cavity and a cross section along the base surface has an area equal to or larger than an opening area of the gate opening, a vent discharging gas unnecessary for molding, and a second intermediate portion connecting an opening on the cavity portion side of the vent extending along the base surface and the cavity and a cross section along the base surface has a cross-sectional area equal to or larger than an area of the gate opening.

Golf ball methods and molds for quickly and efficiently eliminating air/gas from within a mold while better centering a subassembly in the mold during golf ball manufacture and the improved golf balls resulting therefrom.

Golf ball methods and molds for quickly and efficiently eliminating air/gas from within a mold while better centering a subassembly in the mold during golf ball manufacture and the improved golf balls resulting therefrom.

Provided is a method for manufacturing a gasket member as described below. A plate-like base material is clamped between a first and a second split mold, and a gasket is fixed to a surface of the base material by injecting and filling a rubber-like elastic material into a cavity defined between the base material and the first split mold. An air vent is provided including an exhaust groove and an exhaust hole, the exhaust groove extending from the cavity toward an inner or outer peripheral side on a butting surface between the base material and the first split mold and partially opening in a circumferential direction of the cavity, the exhaust hole extending from the exhaust groove in a clamping direction of the first and second split molds. Air in the cavity is discharged through the air vent when the rubber-like elastic material is injected and filled into the cavity.

Provided is a method for manufacturing a gasket member as described below. A plate-like base material is clamped between a first and a second split mold, and a gasket is fixed to a surface of the base material by injecting and filling a rubber-like elastic material into a cavity defined between the base material and the first split mold. An air vent is provided including an exhaust groove and an exhaust hole, the exhaust groove extending from the cavity toward an inner or outer peripheral side on a butting surface between the base material and the first split mold and partially opening in a circumferential direction of the cavity, the exhaust hole extending from the exhaust groove in a clamping direction of the first and second split molds. Air in the cavity is discharged through the air vent when the rubber-like elastic material is injected and filled into the cavity.

Golf ball molds and methods for molding golf balls, particularly golf balls having thermoplastic polyurethane covers, are provided. The molds and methods are particularly suitable for manufacturing covers for golf balls. Multi-piece golf balls having inner cores, outer cores, inner covers, and intermediate layers can be made. Retractable pins are used for holding the golf ball within the mold, wherein each retractable pin has a primary vent section, secondary vent section, and tertiary vent section for removing air and other gasses from the interior spherical cavity of the mold.

Provided is an improved mold structure, including a first mold base, a second mold base and two controllers. The first mold base and the second mold base are operably aligned. When the first mold base and the second mold base are in an aligned state, a mold cavity is jointly framed. Two gas passages, a first mold core and a second mold core are provided. The first mold base is provided with a runner. Two ends thereof are respectively connected to a material tube and a mold cavity of a molding machine. The first and second mold cores are made of porous material. Vent pipelines thereof are connected to the respective gas passages. The two controllers are respectively connected to the gas passages, and control the gas in and out such that the pressure in different areas in the mold cavity reaches a predetermined value, thereby controlling the flow direction of the raw material in the mold cavity.