When using felt hot press forming machines or polyester fiber acoustic panel press machines, many manufacturers face a common issue that affects product quality—wrinkling during the pressing process.
1. Impact of Wrinkling on Product Quality
Wrinkling not only affects the appearance and dimensional accuracy of acoustic panels or felt products, but can also cause poor adhesion during assembly. In serious cases, it may lead to batch rejection, rework, and increased labor costs.
2. Analysis: Why Do Wrinkles Occur During Hot Pressing?
1. Uneven Heating
During preheating, if the oven temperature is unstable, certain areas of the polyester fiber may soften earlier, resulting in pulling and deformation.
2. Incorrect Mold Installation
If the mold is misaligned or not tightly closed, it can lead to surface marks and wrinkling.
3. Inconsistent Material Thickness or Density
Both felt and polyester fiber boards must be uniform. Otherwise, different shrinkage rates during heating can cause local bulging.
4. Insufficient Mold Draft Angle
For deep-formed products, the mold must have a draft or pull frame to prevent the material from collapsing inward and forming folds.
5. Inadequate Preheating
If the material is not fully softened before pressing, internal thermal stress may create “stress wrinkles” during forming.
3. Solutions: How to Prevent Wrinkling During Hot Pressing?
✅ Use industrial ovens with circulating air ducts to ensure uniform heating
✅ Ensure proper mold alignment and closure before pressing
✅ Check material thickness consistency before cutting; full-roll or full-sheet feeding is recommended
✅ Use press machines with variable speed settings – fast rising, slow closing to reduce impact
4. Recommended Equipment: Huahui Polyester Fiber Forming Solutions
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Polyester Fiber Press Machine: Suitable for 3D acoustic panels, wall panels, lampshades, etc. Easy to operate, with stable pressure control
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Four-Post Cutting Machine: Designed for trimming the edges of pressed products
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Industrial Oven: Reaches up to 200°C, with hot air circulation for even preheating
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Chiller: Cools the mold to improve product quality and cycle time
5. Conclusion
Wrinkling during the pressing of felt and polyester fiber acoustic panels is often due to a mismatch between material, equipment, and mold setup. By choosing high-precision forming machines and applying the right process control, this issue can be effectively avoided.
Dongguan Huahui Hydraulic Technology Co., Ltd. specializes in hot press forming solutions for materials including felt, polyester fiber, EVA, and carbon fiber. Contact us for sample testing and technical support.