PET Mold Core

Quality control in the beverage industry starts long before the liquid hits the bottle. It starts in the injection mold. The 35*208.7mm core is responsible for the entire internal surface of your preform. If that surface is flawed, your final bottle will be flawed. At BJY, we regard quality as an uncompromising standard, providing the precision components that global beverage brands require.

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Precision Starts at the Core: The Foundation of PET Preform Quality
Quality control in the beverage industry starts long before the liquid hits the bottle. It starts in the injection mold. The 35*208.7mm core is responsible for the entire internal surface of your preform. If that surface is flawed, your final bottle will be flawed. At BJY, we regard quality as an uncompromising standard, providing the precision components that global beverage brands require.
Perfect Concentricity: Ensuring Uniform Walls and Stronger Bottles
What does "quality" mean for a 35mm core? It means perfect concentricity. If the core shifts during injection, the wall thickness will be uneven. This leads to "thin spots" that can cause a bottle to fail under carbonation pressure. Our cores are machined to tolerances that most shops can’t even measure. We use CMM (Coordinate Measuring Machine) verification to ensure that every 208.7mm length is perfectly straight and every 35mm diameter is exact.
Special Treatment Process: Protecting Hygiene and Improving Production Efficiency
Hygiene and surface finish are equally important. Beverage plants operate under strict sanitary conditions. Our cores are special surface treatment not just for ejection speed, but to prevent pet "build-up" where bacteria or contaminants could hide. A smooth, flawless surface is easier to clean and ensures that every batch of preforms is as pure as the product that will go inside them. This is why our cores are the top choice for water and sensitive juice production.
Engineering Reliability Since 2011: BJY’s Commitment to Consistent Performance
Since 2011, Baijinyi (BJY) has been a beacon of reliability in the Foshan manufacturing hub. We follow a strict ISO-aligned process for every part that leaves our shop. We don’t cut corners on steel quality or heat treatment times. We know that our parts are going into factories that run 24/7, and they have to work perfectly every single time. That is our promise to every technical director who installs a BJY core.
Beyond Parts: Delivering Production Confidence and Long-Term Value
When you choose BJY, you are not just buying a spare part; you are buying peace of mind. You are ensuring that your preforms will blow into perfect bottles, that your rejection rate will stay low, and that your brand’s reputation for quality will remain intact. Let us help you elevate your production standards with our premium 35*208.7mm mandrels currently available on the market.