In large roof sandwich panels, how to prevent wind uplift from causing facing-core delamination?
Wind uplift creates negative pressure at roof edges and[…]
When using PU foam for cold storage sandwich panels, why must the “thermal bridge” effect be considered in design?
A thermal bridge occurs when metal connectors or penetrations[…]
How can the foaming index (ISO index) of PU foam be controlled to optimize sandwich panel dimensional stability?
ISO index = (actual isocyanate used / theoretical amount[…]
How does the addition of flame retardants to fire-retardant PET foam affect the foaming process and mechanical properties?
The most common flame retardants are aluminum hypophosphite (AHP)[…]
Why are PVC foam sandwich panels prone to core crushing during vacuum bag molding?
Vacuum bag pressure is typically one atmosphere (about 0.1[…]
Can two different core materials (e.g., XPS and PU) be mixed to make functionally graded sandwich panels?
Yes – this is called a functionally graded foam core[…]
How to detect “debonding” defects between core and facings in sandwich panels?
The fastest non-destructive test is tap testing – using a special[…]
When producing lightweight PET sandwich panels, reducing density by 5% to save weight – what performance penalty can be expected?
Foam core compressive strength follows a power law σ[…]
Why do different resin systems (unsaturated polyester, epoxy, polyurethane) have widely varying compatibility with cores?
The key lies in “like dissolves like” – polarity,[…]
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