Why Does Ionoplast Interlayer Laminated Glass Still Have Bubbles Even with a Vacuum Bag?

Project Technical Specifications Overview

• Glass Structure: 10 mm + 1.14 mm IPL (Ionoplast Layer) + 0.89 mm IPL + 10 mm
• Single Sheet Dimensions: 2704 mm × 3515 mm (Approx. 9.5 m² per sheet)

1. Background & Processing Challenges

1. Oversized Dimensions: The large footprint naturally complicates air evacuation.
2. Asymmetric Interlayer Stacking: The recipe required stacking two different thicknesses of Ionoplast functional interlayers (1.14 mm and 0.89 mm).

2. On-Site Troubleshooting & Root Cause Analysis

• Autoclave Vacuum Component Power Degradation: One set of the vacuum assemblies inside the autoclave had suffered significant power degradation. This hidden hardware flaw directly resulted in insufficient vacuum pressure during the cycle, making it impossible to completely evacuate residual air trapped between the stacked interlayers and along the edges.
• Parameter Diagnostics: The customer's original parameter settings and Innolamin's diagnostics are detailed in the table below: 

1. Hardware Overhaul: The team organized maintenance personnel to service the degraded vacuum system. Damaged vacuum components were replaced, successfully restoring the autoclave's vacuum suction capacity to its rated standard.
2. Parameter Fine-Tuning: While keeping the Stage 1 parameters, hold time, and pressure unchanged, the Stage 2 processing temperature was increased from 125°C to 135°C.