What are the hidden mold black technologies in thermoformed vacuum packaging?

For large membership based warehousing supermarkets such as Sam's Club/Market Opener, due to their "big packaging, high turnover" business model, the requirements for blister packaging are extremely strict.

The technology of molds directly affects the quality of packaging, which is mainly reflected in the following typical packaging on Costco shelves:

1, Blueberry/Strawberry Combo Clamshells Box 
Mold technology: Using porous aluminum molds.
Performance: You will find that Costco's Kirkland or Driscoll's berry boxes are very transparent, without the dense exhaust needle marks of old-fashioned packaging. This technology allows the box to maintain air circulation while appearing as smooth and clear as glass, which can stimulate purchasing desire.
2, Grilled chicken/ready to eat cooked food base:
Mold technology: Plug Assist and Conform Cooling.
Performance: Costco sells hundreds of millions of roasted chickens every year, and its PP heat-resistant base requires extremely high compressive strength. Due to the deep depth of this tray, the use of high-performance pressure assisted plug technology can make the thickness of the side walls and bottom almost the same. This not only ensures that consumers will not "leak" when carrying it home due to heat softening, but also saves a lot of raw material costs through extreme thinning.