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Producing transparent silicone pads (such as electronic rubber feet, non-slip mats, shock-absorbing pads, medical placemats, etc.) requires extremely strict standards for compression molding machines. The biggest challenges for clear silicone are black spots/impurities and air bubbles/yellowing. Therefore, a high-precision Vacuum Hydraulic Compression Molding Machine (Vacuum Press) is universally chosen as the core equipment.
Below is a detailed guide on the core configurations, tonnage selection, and key manufacturing processes for transparent silicone pad molding machines.
To guarantee high transparency, bubble-free results, and a high yield rate for silicone pads, the molding machine must feature the following hardware setups:
Efficient Vacuum Hood System
Function: This is the lifeline for preventing air bubbles and material shortage. The vacuum hood rapidly extracts air from the mold cavity right before the mold fully closes (typically reaching a vacuum level above -0.095 MPa), ensuring absolute elimination of micro-bubbles inside the clear material.
Precision Temperature Control System (Electric Heating + PID)
Function: Transparent silicone is highly sensitive to temperature. Overheating causes yellowing, while underheating leads to incomplete curing, which ruins clarity. The temperature uniformity across the heating plates must be controlled within ±2°C to prevent local overheating.
Multi-Stage Slow Closing & Pressure Control
Function: The machine supports multi-stage adjustment for both pressure and speed. As the mold approaches full closure, it switches to a slow-press mode combined with precise bumping (air venting) actions. This allows the clear compound to fill the cavity smoothly, reducing air marks caused by shear stress.
High-Cleanliness Protective Design
| Name | 30T single head hydraulic machine | 50T single head hydraulic machine | 63T single head hydraulic machine | 100T single head hydraulic machine |
| Model | JY-A02V | JY-A02V | JY-A02V | JY-A02V |
| Voltage | 380V | 380V | 380V | 380V |
| Max working pressure | 30 | 50 | 63 | 100 |
| Wore area | 300*300mm | 350*350mm | 400*400mm | 450*450mm |
| Power | 3.7kw | 5.5kw | 5.5kw | 5.5kw |
| Heating Power | 10.8kw | 10.8kw | 10.8kw | 10.8kw |
| Total Power | 16kw | 17.8kw | 20.3kw | 20.3kw |
| Max temp | 400℃ | 400℃ | 400℃ | 400℃ |
| Main cylinder diameter | 150mm | 180mm | 200mm | 250mm |
| Main cylinder stroke | 160mm | 160mm | 250mm | 250mm |
| Vacuum pump power | 1.5kw | 1.5kw | 4kw | 4kw |
| Cylinder stroke of vacuum hood | 100mm | 100mm | 200mm | 200mm |
| Size | 1250*1530*1550mm | 1350*1650*1650mm | 1560*2020*2060mm | 1570*2150*2060mm |
| Weight | 1200kg | 1500kg | 2500kg | 3500kg |
Achieving a perfect crystal-clear product relies not just on the machine, but on the seamless coordination of "Machine, Mold, Material, and Operator." The standard workflow is as follows:
Material Preparation & Weighing (Dust-Free Environment Needed)
Use high-transparency solid silicone rubber. Cut the compound precisely according to the cavity weight using a clean cutting machine. Workers must wear latex gloves; touching the raw material directly with bare hands is strictly forbidden to prevent sweat from causing the cured silicone to turn whitish.
Material Loading & Mold Entry (Speed is Crucial)
Quickly place the precut clear silicone strips or blocks into the preheated mold cavities. The mold surface must be highly mirror-polished or chrome-plated to ensure a glossy, crystal-clear finish on the final product.
Vacuuming, Clamping & Curing (Core Molding Stage)
The vacuum hood closes to rapidly extract air, followed by the hydraulic cylinder rising to lock the mold. The material cures under high pressure at 165°C - 175°C (curing time typically ranges from 60 to 180 seconds, depending on the thickness).
Mold Opening & Demolding (Via 2RT/3RT Automation)
The machine automatically opens and shifts out the mold. Since clear silicone is inherently tacky, spring ejector pins or manual air-blowing guns are widely used to peel the silicone pads off in whole sheets without tearing them.
Post-Curing / Oven Baking (Enhancing Clarity & Performance)
Place the molded transparent pads into a post-curing oven at 180°C - 200°C for 2 to 4 hours. This step thoroughly volatilizes any residual curing agents, making the silicone pads more transparent, resistant to yellowing, and completely odorless.
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