A stack mold

The mold stack (100) wherein the core insert assembly (102) comprises a core inner part member (122) and a core insert (106), the core insert (106) for defining a portion of a molded article and the core inner part member (122) for attachment to a core plate.

A method of operating a molding apparatus having a plurality of molding cavities, comprising:

• measuring a pressure profile for a first molding cavity and a second molding cavity;
• comparing the pressure profiles;
• adjusting an operational parameter of the molding apparatus to obtain the same pressure profile within all of the molding cavities.

The method of claim 12, wherein measuring comprises measuring the in-mold pressure using the entire active surface of the core assembly.

A mold stack (100) comprising:

• a core insert assembly (102), the core insert assembly (102) for defining an inner portion of a molded article to be molded, the core insert assembly (102) including a core inner part member (122) and a core insert (106), the core insert (106) for defining a portion of a molded article and the core inner part member (122) for attachment to a core plate, the core inner part member (122) and the core insert (106) ate coupled via a threaded connection.