In custom EVA case manufacturing, many products need more than a smooth molded shell. Tool cases, first aid kits, travel organizers, and electronic protective cases may require side grooves, side logo positions, card slots, or reinforced side structures. EVA thermoforming side indentation is designed for this purpose.
What Is EVA Thermoforming Side Indentation?
EVA thermoforming side indentation is a modified hot press molding process. Based on standard upper-and-lower mold thermoforming, side cylinders or side pressure modules are added to press local recessed features into the side wall of the EVA part.
The process combines overall forming and side detail forming in one molding cycle. EVA sheets are heated and softened, positioned in the mold, shaped by the main mold, side-pressed to the target depth, cooled inside the mold, and then trimmed or assembled according to the final product design.
Typical applications include: custom EVA tool cases, EVA first aid cases, travel cases, electronic protective cases, molded packaging, side logo recesses, side card slots, positioning grooves, and structural reinforcement areas.
How the EVA Hot Press Side Indentation Process Works
The basic principle is material softening and controlled compression. EVA becomes flexible after heating. When the softened EVA sheet is placed into the mold, the upper and lower molds create the main product shape, while the side module presses the side area into a recessed shape.
These parameters are not fixed standards. EVA hardness, thickness, density, surface lamination, mold temperature, product size, and indentation shape can all affect the final process window.
1. EVA Sheet Heating
The EVA sheet is heated evenly until it becomes soft enough for stable thermoforming.
Standard Production Process for Side-Pressed EVA Parts
A standard production process includes material preparation, pre-cutting, heating, mold loading, main hot press forming, side indentation forming, cooling, demolding, trimming, and post-processing. Positioning accuracy and cooling stability are especially important because side-pressed features are more sensitive to movement and rebound.
- Material preparation and pre-cutting: Cut the EVA sheet according to product size and reserve 1–3% edge allowance when needed.
- Heating and softening: Heat the EVA sheet evenly and avoid local overheating, yellowing, excessive shrinkage, or sticky surfaces.
Recommended EVA Hot Press Molding Parameters
The following values are practical starting points for side-pressed EVA molding. Final production parameters should always be confirmed by sample testing because different EVA materials and product structures behave differently during heating, pressing, and cooling.
| Defect | Possible Cause | Solution |
|---|---|---|
| Indentation rebound or insufficient depth | Side pressure is too low, holding time is too short, or demolding temperature is too high. | Reserve 0.1–0.3 mm depth compensation, extend side holding time, and reduce demolding temperature. |
| Indentation rebound or insufficient depth | Indentation rebound or insufficient depth | Indentation rebound or insufficient depth |
Custom EVA Tool Cases
Side grooves can be used for label areas, anti-slip zones, stacking alignment, positioning features, or reinforced side structures.
EVA First Aid Cases
Recessed side logo positions can protect printed, embossed, or patched logos from friction during daily use.
EVA Travel and Electronic Cases
Side slots and local depressions can improve zipper alignment, insert positioning, accessory storage, and visual identification.
Advantages
- Side details and the main body can be formed in one molding cycle.
Limitations
- The mold structure is more complex than a standard upper-and-lower hot press mold.
Questions to Ask Your Supplier
- What is EVA thermoforming side indentation?
- What is EVA thermoforming side indentation?
What is EVA thermoforming side indentation?
It is a hot press molding process that uses upper and lower molds to form the main EVA shape while side pressure modules create local recessed features on the side wall.
Need a Custom EVA Case With Side Indentation?
Dongguan Youfeng Industrial Co., Ltd. supports custom EVA case development, EVA hot press molding, side-pressed EVA structures, foam inserts, fabric lamination, sewing, logo processing, and packaging. Send your drawing, sample, or product idea, and our team can help review the molding feasibility and suggest a suitable process.
Contact Us for Custom EVA Manufacturing