Stretch Rod for Krones Blow Molding Machines
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Product Details
Overview
In a PET blow molding line, the stretch rod plays a direct and practical role in how a bottle finally turns out. It works inside the machine during the forming stage, contacting the preform and controlling how it stretches before full air blowing begins.
This model is designed for Krones systems and built to keep stable performance under continuous, high-speed production.
Specifications
Material: High-grade stainless steel
Diameter & Length: Ø14 × 772 mm
Machine Compatibility: Krones blow molding equipment
Production Method: CNC precision machining
What It Does in Production
Controlled axial stretching
Before high-pressure air expands the preform, the stretch rod moves down into it and pushes it in the axial direction. This step is important because it sets the base shape and prepares the material for final forming.
Helps avoid uneven wall thickness
If the material doesn’t spread properly, problems like thin spots or off-center bottoms can appear. The stretch rod works together with air pressure to guide the material more evenly inside the mold.
Better shaping for non-standard bottles
For bottles with shoulders or custom shapes, simple air pressure isn’t enough. The movement of the rod helps the material reach the right areas of the mold, improving definition and consistency.
Improves bottle strength
Stretching changes how the material behaves at a molecular level. With proper elongation, the finished bottle handles pressure, impact, and transport stress better.
Design & Durability
The rod is made from stainless steel selected for strength and wear resistance. In real production environments, this matters more than theory — parts need to keep their shape and performance after long cycles, not just at the beginning.
Surface finishing and dimensional control are handled through CNC machining to ensure each piece fits and runs smoothly.
Why Work with BJY
Experience that comes from actual production
Foshan Baijinyi Precise Technology Co., Ltd. has been working in PET mold and spare parts manufacturing since 2011. The focus is not just on drawings, but on how parts perform in real machines.
Compatibility across major systems
Besides Krones, BJY also supplies components for Sidel, KHS and other widely used platforms.
Stable quality from batch to batch
Consistency is critical for high-speed lines. Each part is checked before delivery to reduce variation during operation.
Direct and responsive communication
Clear replies and practical support help avoid delays, especially when parts are needed urgently.
Typical Applications
Bottled water production
Beverage packaging lines
Edible oil containers
High-speed PET blowing systems
About BJY
FOSHAN BAIJINYI PRECISE TECHNOLOGY CO., LTD. (BJY) focuses on PET molds and related components, including preform molds, blow molds, and cap molds. The company supplies parts compatible with multiple international machine brands and serves customers in the global packaging industry.
Website: www.baijinyi.cn
Keywords:
PET Blow mold,PET Preform mold,Capping mold,HUSKY,Krones,Sidel,SIPA,Sacmi
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