Method for manufacturing lamp shell

A method for manufacturing lamp shell, comprising the steps of:

• preparing a plastic material;
• injecting the plastic material into an injection molding equipment, the injection molding equipment including a first mold half and a second mold half, wherein the second mold half has a neck portion at a top end thereof, which runs over into a body portion having a partially larger opening width than the neck portion, wherein the first and the second mold halves together form an injection chamber and wherein the plastic material is injected into the injection chamber at the top end and between the first and the second mold halves to form a perform which has a first space with an opening at one end to form a connecting section corresponding to the neck portion and another end closed to form a light penetrating section corresponding to the body portion, wherein the light penetrating section has a greater thickness than the connecting section;
• releasing and removing the preform from the first and second mold halves after being cooled and solidified;
• heating the performing to facilitate blowing the plastic material;
• and
• blowing the plastic material after having placed the preform in a blow molding equipment by injecting gas into the preform to inflate the preform through gas pressure to form a second space at a greater size than the first space to become a lamp shell.