Thường dùng cho các sản phẩm mỏng và phẳng nhằm giảm ứng xuất cắt trong khuôn. Lực cắt cao tập trung xung quanh miệng phun bị hạn chế bởi then, then này được cắt sau khi mở khuôn.
Often used for thin and flat products aimed at reducing the application export cut in the mold. High cutting Force concentrated around the mouth spray is limited by then, then is cut after the opening of the mold.
Often used for thin and flat products to reduce stress cut on site. High shear forces concentrated around the vents is restricted by then, then was cut after opening the mold.