How To Resolve The Issue of Air Bubbles inside Softgels

Views: 167 Author: Hunan Grand packing machinery Publish Time: 2026-05-09 Origin: Hunan Grand Packing Machinery

Softgel Production FAQ: Definitive Solutions for Incomplete Filling & Internal Air Bubbles

In batch softgel production, incomplete filling and internal air bubbles are the most common process anomalies, directly impacting filling accuracy, appearance yield, and GMP compliance. Some production teams temporarily fix bubbles by pressing the gelatin ribbon tightly against rollers and increasing clamping force, but this non-standard practice risks stretching/deforming the gelatin shell and accelerating mechanical wear. Field validation confirms full free-fall contact between the nozzle assembly and the mold is the core permanent fix. This document provides on-site troubleshooting, standardized operation, and equipment selection guidance for stable, efficient pharmaceutical production.

I. Quick Troubleshooting & Standardized Solutions for Core Failures

Q1: Why is temporary roller pressing & over-clamping not recommended for long-term use?

Manually pressing the gelatin ribbon against rollers and boosting clamping force forcibly closes gaps between the nozzle and mold to block air intake temporarily. However, long-term over-clamping causes uneven shell thickness, fluctuating filling volume, and accelerated wear of rollers/nozzles. This manual operation lacks standardization and traceability, violating GMP. It is only for short-term emergency use; root-correction requires standardized equipment calibration.

Q2: How to precisely calibrate the nozzle assembly (core step to eliminate bubbles)?

Power off the machine, loosen the nozzle mounting bolts, and adjust the nozzle to maintain full free-fall contact with the mold surface—no suspension, offset, or gaps.
Lock the assembly and verify by manual cranking: the gelatin ribbon runs smoothly without scraping or warping, creating a sealed filling chamber to completely prevent air entrainment.
High-quality softgel equipment features a self-positioning nozzle mechanism, simplifying calibration and structurally eliminating gap risks.

Q3: How to resolve bubbles/incomplete filling caused by insufficient lubrication?

Check the control panel to confirm the lubrication system is activated; never run the machine with lubrication disabled.
Refill the oil tank with pharmaceutical-grade liquid paraffin to the standard level for consistent lubrication and smooth ribbon tracking.
Formal pharmaceutical equipment integrates an auto-lubrication system linked to startup, eliminating manual operation errors.

Q4: Targeted fix for isolated bubbles/incomplete filling in individual capsules?

Locate the mold cavity corresponding to defective capsules and remove residual empty shells or gelatin debris with specialized tools to restore unobstructed venting.
Conduct full cavity inspection before each shift to avoid molding defects from local blockages.
Softgel equipment with high-precision standardized molds features superior cavity smoothness, greatly reducing debris retention and related failures.

Q5: How to stabilize processes and prevent recurring issues?

Set standard roller clamping force per equipment protocols; prohibit arbitrary over-clamping to replace non-standard emergency practices.
Synchronize gelatin ribbon feeding speed with nozzle filling speed for consistent production and improved filling fullness.
Save nozzle position, lubrication, and clamping force parameters into equipment recipes for one-click recall, minimizing human error.

II. GMP Long-Term Production Control Points

Pre-start checklist: Verify lubrication status, oil level, nozzle contact, and mold cavity cleanliness in a standardized workflow.
In-process inspection: Check capsule fullness and bubbles every 30 minutes for early detection and correction.
Ban non-standard emergency practices; rely on equipment design and standardized calibration for production stability.
Select reliable, service-oriented, cost-effective softgel equipment and packaging machine suppliers to reduce failure rates at the source.

III. Pharmaceutical Softgel & Packaging Equipment Selection Guide

When sourcing softgel equipment and pharmaceutical packaging machines, pharmaceutical manufacturers prioritize equipment stability, calibration ease, after-sales response, and total cost of ownership. Equipment with precision free-fall nozzle alignment, auto-linked lubrication, and GMP-compliant high-precision molds structurally eliminates frequent failures like incomplete filling and air bubbles, sharply improving productivity and yield.

Migrand Machinery (Hunan Grand Packing Machine) specializes in R&D and manufacturing of pharmaceutical softgel equipment and packaging machinery. Our equipment integrates standardized nozzle positioning, automatic lubrication, and GMP-aligned high-precision molds. With reliable product quality, responsive after-sales support, and competitive total cost of ownership, we are a trusted supplier for pharmaceutical companies seeking softgel and pharmaceutical packaging solutions. We provide full technical support—from equipment calibration and troubleshooting to production maintenance—to help you resolve core softgel production issues (bubbles, filling anomalies) at the source.