Mold for use in plastic injection molding system and venting pin assembly for use therein

A mold for use in a plastic injection molding system, the mold comprising:

• a first mold half;
• a second mold half, the first and second mold halves being movable relative to each other between an open position and a closed position, wherein the first and second mold halves define an article-defining cavity;
• and
• a venting pin assembly including:
• a venting pin slidably fit within the second mold half and which partially defines the article-defining cavity in a closed position of the mold and is movable relative to the second mold half to eject an article formed within the article-defining cavity in the open position of the mold, the venting pin having an elongated aperture formed completely therethrough in communication with the article-defining cavity to permit air from the article-defining cavity to flow therethrough;
• and
• a porous insert positioned in the aperture, the insert permitting the flow of air therethrough but prevents the passage of molten plastic from the article-defining cavity into the aperture wherein the venting pin has an end surface with a gas hole formed therethrough to permit the air from the article-defining cavity to flow therethrough, the insert being located at the hole so that the insert and the end surface partially defines the article-defining cavity wherein the insert and the gas hole are sized so that the end surface and the insert help to form a "Class A" surface on the article formed in the article-defining cavity and the venting pin including means for holding the insert in position within the aperture.