초록

A plastic article is formed in an injection mold by injecting molten plastic into the injection mold at an elevated temperature, cooling the plastic from the molten condition to a solid condition, and crystallizing a portion of the plastic by slowing down the cooling of said portion.

대표청구항 ▼

1. The apparatus which comprises:an injection mold having a mold cavity therein; means for injecting molten plastic into said mold to form a plastic article therein; means in heat exchange relationship with said mold cavity to cool said plastic from the molten condition to the solid condition; where

1. The apparatus which comprises:an injection mold having a mold cavity therein; means for injecting molten plastic into said mold to form a plastic article therein; means in heat exchange relationship with said mold cavity to cool said plastic from the molten condition to the solid condition; wherein said means includes a first means adjacent a first portion of said plastic to rapidly cool said first portion of said plastic at least in part inside the mold from the molten condition to the solid condition to form an amorphous first portion, and includes a second means adjacent a second portion of said plastic to slowly cool said second portion at least in part inside the mold from the molten condition to the solid condition to form a crystallized second portion; and wherein the article has a closed bottom, a sidewall portion extending from the closed bottom, and a neck region extending from the sidewall, wherein the means adjacent the second portion is adjacent at least a portion of the neck region'to form a neck region where the crystallized portion thereof has a higher strength than the body region, and wherein the means adjacent the second portion includes means adjacent said second portion which causes at least a portion of the second portion to cool at a slower rate than the first portion.