- Disperser and other liquid mixer
- Powder mixer
- Planetary mixer (high viscosity)
- Sigma kneader
- Grinding machine series
- Reactor and mixing tank
- Filter and filling machine
- Paint production line
- PVC stabilizer production line
- Hot melt adhesive production line
- Fire extinguishing powder production line
- Sealant production line
Troubleshooting Glue Stick Production: How to Eliminate Bubbles and Deformation
Title: Troubleshooting Glue Stick Production: How to Eliminate Bubbles and Deformation
In hot melt glue stick manufacturing, maintaining consistent product quality is key to keeping your buyers happy. Two of the most common issues that plague factories are internal air bubbles and stick deformation (out-of-roundness).
As a veteran manufacturer of chemical and plastic machinery, LAIZHOU KEDA CHEMICAL MACHINERY CO., LTD. shares the technical reasons behind these flaws and how modern machinery solves them.
Problem 1: Air Bubbles Inside the Glue Stick
Air bubbles don't just look unprofessional; they cause sputtering and uneven melting when end-users use them in glue guns.
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The Cause: Bubbles are usually caused by moisture in the raw materials (EVA resin/tackifier) or improper screw speed and pressure inside the extruder, which traps air.
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The Solution: Ensure raw materials are properly stored and dried. More importantly, use an extruder screw designed specifically for hot melt adhesives. LAIZHOU KEDA's screws are engineered to optimize degassing and pressure distribution, completely eliminating trapped air during the extrusion process.
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Problem 2: Deformation and Inconsistent Diameter
If a glue stick is oval instead of perfectly round, or if the diameter varies, it will jam the customer's glue gun.
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The Cause: This happens when the glue stick leaves the extrusion die and enters the cooling water too slowly, or if the cooling water temperature fluctuates. Because hot melt glue retains heat, it can deform under its own weight if not cooled fast enough.
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The Solution: A high-efficiency cooling tunnel with structured sizing rollers is essential. Our production lines feature stabilized water temperature controls and precision guiding molds that lock the shape of the glue stick the moment it enters the cooling phase.
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Summary of Common Production Issues
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Issue |
Root Cause |
Machinery Fix |
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Bubbles |
Trapped air / Moisture |
Advanced Degassing Screw Design |
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Deformation |
Slow or uneven cooling |
Chilled Water Precision Sizing Tunnels |
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Rough Surface |
Incorrect melt temperature |
Multi-Zone PLC Temperature Sensors |
Upgrade to Zero-Defect Production
If your current machinery is causing high scrap rates and customer complaints, it’s time for an upgrade. LAIZHOU KEDA provides the technical expertise and robust machinery required to produce flawless hot melt products.
Contact our specialist today for a free technical consultation:
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Company Name: LAIZHOU KEDA CHEMICAL MACHINERY CO., LTD.
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Contact: Sherry
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Email: Sherry@kedahuaji.com
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WhatsApp/Phone: +86-15064512888
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Website: www.kedahuaji.com
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