In biological laboratories, PETG media bottles are specialized containers used for storing culture media. Their quality directly impacts the stability of the media and the reliability of experimental results. To ensure high-quality bottles, the production process must be precisely controlled. So, how are PETG media bottles manufactured? Below is a detailed breakdown of the core production steps.

 

In biological laboratories, PETG media bottles are specialized containers used for storing culture media. Their quality directly impacts the stability of the media and the reliability of experimental results. To ensure high-quality bottles, the production process must be precisely controlled. So, how are PETG media bottles manufactured? Below is a detailed breakdown of the core production steps.

 

Material Selection and Preheating

PETG media bottles are typically made of transparent PET material, which offers excellent clarity, chemical stability, and mechanical strength. Before production, the PET material undergoes preheating to ensure optimal plasticity during the subsequent blow-molding process.

 

60ml PETG Square Media Bottle

 

Stretching Stage

The preheated preform is placed into a mold, and a stretch rod begins moving downward to elongate the preform along the axial direction. The stretching speed is a critical parameter:

 

Too fast: Excessive material accumulates at the bottom while the upper part becomes too thin, compromising mechanical performance.

 

Too slow: Insufficient material at the bottom similarly affects overall quality.
By precisely controlling the stretching speed, uniform material distribution along the axis is ensured.

 

Pre-Blow Stage

Pre-blowing maintains an appropriate distance between the preform material and the stretch rod during elongation, preventing contact. If the material touches the stretch rod, localized cooling and friction can occur, leading to uneven stretching.

 

Pre-blow pressure: Typically maintained at 6–10 bar.

 

Pre-blow time: Precisely set to ensure even material distribution and avoid premature contact with the mold wall.

 

Blow-Molding and Cooling

After pre-blowing, the process moves to the blow-molding stage. High-pressure gas expands the preform against the mold wall, forming the final shape of the PETG media bottle. The bottle is then cooled to solidify its structure and enhance mechanical strength. Temperature and cooling time are carefully controlled to prevent deformation or internal stress.

 

250ml Square Media Bottle PET PETG

 

Quality Inspection

Every batch of PETG media bottles undergoes rigorous quality checks, including:

 

Visual inspection: Ensures no bubbles, scratches, or deformities.

 

Dimensional accuracy: Verifies that the bottle mouth and body meet standard specifications.

 

Sealability testing: Confirms the airtight performance between the cap and bottle mouth.

 

The production of PETG media bottles combines precision engineering with strict quality control, ensuring each bottle meets the high standards of laboratory applications. FDCELL specializes in high-end biological consumables, providing reliable support for your experiments. Contact us today to learn more about our products!