What is a Deflashing Unit in Blow Molding?

In the context of extrusion blow molding machine, a deflashing unit is an automated mechanical system or component designed to remove excess plastic (called “flash” or “burr”) from a newly molded container.

When blow molding machine closes its molds around a tube of molten plastic (the parison), some material is squeezed out at the top (neck), bottom (tail), and sometimes the sides (handle areas). This extra material must be removed to create a finished, functional product.

How Deflashing Unit Works?

• Molding: The mold closes, pinching the top and bottom of the plastic tube.
• Ejection: Once the bottle is cooled and solid, it is ejected from the mold with the extra plastic still attached.
• Trimming: The deflashing unit (either integrated into the machine or as a standalone station) uses mechanical strikers, cutters, or hydraulic punches to “punch off” the excess material.
• Recycling: The removed flash falls onto a conveyor belt and is usually sent directly to a granulator to be ground up and reused.

Deflashing Unit Video:

Deflashing Unit Advantages:

• Consistency: Manual trimming with a knife is slow and leads to jagged edges. A deflashing unit provides a clean, smooth finish every time.
• Labor Savings: Eliminates the need for manual labor to sit and trim bottles by hand, significantly reducing operational costs.
• Safety: Removes the hazard of workers using sharp manual tools near production lines.
• Sustainability: Automates the collection of scrap, ensuring that 10-30% of the plastic (the flash) is immediately recycled back into the production cycle without contamination.

FAQ:

Q: Can one deflashing unit be used for different bottle designs?

A: Yes, but it usually requires a change of the “trimming mold” or “stripper plate” that matches the profile of the new bottle.

Q: Does automatic deflashing affect cycle time?

A: No. In modern Bestar machines, deflashing occurs simultaneously with the next molding cycle, meaning it does not slow down your total output.

Q: Is it suitable for handle bottles?

A: Yes, deflashing units are essential for handle bottles to remove the “slug” of plastic from inside the handle area.

About Suzhou Bestar Blow Molding Machinery Co., Ltd:

Beier Group and Bestar company are same owner And Bestar has been established for more than 19years. Bestar provides customers high efficiency, innovative, energy saving blow molding machinery solutions. Bestar blow molding machines sold to more than 60 countries.

Series blow molding machine is used for blowing 100ml-1250L HDPE PE PP products like milk bottles, daily chemical packaging bottles, jerry cans, pesticide bottles / medicine bottles and stacking barrels.

Please write your machine inquire Email, Phone Number and Company Name here, we will respond within 12h. Or you can directly contact us: Email: sales@bestarmachinery.com or at Whatsapp/Wechat +86 18862609888.