Mold core assembly and sliding element

A mold core assembly for forming a partial shape of a sliding element of a zipper head assembly structure, the sliding element having a base portion, two lateral wall portions, and a seat portion, the two lateral wall portions respectively upwardly extended from two opposite lateral sides of the base portion, the two lateral wall portions corresponding to each other and connected to a front side of the base portion, the seat portion disposed on the base portion and connected to a back side of the base portion, the seat portion having a main body disposed on the base portion and connected to the back side of the base portion, two strip convex ribs respectively disposed on two opposite sides of the main body, and two concave spaces respectively connected to the two strip convex ribs and respectively partially surrounding the two strip convex ribs, characterized in that the mold core assembly comprises:

• a first mold core structure having a first base body, two first lateral structure bodies extended from the first base body and opposite to each other, and a first middle structure body extended from the first base body and disposed between the two first lateral structure bodies, wherein the first middle structure body has two first extending portions opposite to each other, and each first extending portion has a first basis portion and two first thickening portions inwardly projected from the first basis portion;
• and
• a second mold core structure having a second base body, two second lateral structure bodies extended from the second base body and opposite to each other, and a second middle structure body extended from the second base body and disposed between the two second lateral structure bodies, wherein the second middle structure body has two second extending portions opposite to each other, and each second extending portion has a second basis portion and two second thickening portions inwardly projected from the second basis portion;
• wherein the two first extending portions of the first middle structure body are respectively connected to the two second extending portions of the second middle structure body, and a partial shape of the seat portion is formed by matching the two first extending portions of the first middle structure body of the first mold core structure and the two second extending portions of the second middle structure body of the second mold core structure;
• wherein the two first thickening portions of one of the two first extending portions respectively facing the two first thickening portions of another one of the two first extending portions, the first basis portion has a first basis thickness, the first thickening portion has a first thickening thickness, and the first thickening thickness of the first thickening portion is larger than the first basis thickness of the first basis portion;
• wherein the two second thickening portions of one of the two second extending portions respectively facing the two second thickening portions of another one of the two second extending portions, the second basis portion has a second basis thickness, the second thickening portion has a second thickening thickness, and the second thickening thickness of the second thickening portion is larger than the second basis thickness of the second basis portion.