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A PVC conveyor oven (commonly known as a tunnel oven or baking line) is the engine of high-volume PVC promotional and garment accessory manufacturing. It is designed to continuously flash-melt liquid PVC plastisol into durable, solid rubber products like keychains, shoe charms, patches, and zipper pullers.
Unlike a batch oven where molds are loaded manually on trays, a conveyor oven integrates perfectly into an automated or semi-automated dispensing line to maximize output.
How a PVC Conveyor Line OperatesFor multi-color micro-injection or automatic dispensing, the production process follows a highly efficient, cyclical loop:
1.Dispensing (Liquid Injection): An automatic dispensing machine drops multi-color liquid PVC plastisol into aluminum, brass, or silicone molds.
2.Flash Heating (Gelling)：The molds travel on the conveyor belt into the heating tunnel. Far-Infrared (IR) heating tubes quickly heat the surface to 150°C to 180°C, turning the liquid paste into a solid, rubbery layer within 15–30 seconds.
3.Cooling (Setting)：As the molds exit the heating chamber, they pass under a cooling section equipped with water-cooled platens or high-velocity fans to quickly drop the mold temperature so the product can be safely handled.
4.Stripping & Re-use：Workers or robotic arms strip the finished PVC pieces from the molds. The empty, cooled molds travel right back to the dispensing area to repeat the cycle.
| Name | PVC production double line | 3.4m Production line | 1.8m Production line |
| Model | JY-SO1 | JY-SO2 | JY-SO4 |
| Voltage | 380V,3phase | 380V,3phase | 380V,3phase |
| Heating area | 3000*400mm | 2000*300mm | 1000*300mm |
| Cooling area | 1000*400mm | 480*258mm | |
| Max temp | 400℃ | 400℃ | 400℃ |
| Move speed | Adjustable | Adjustable | Adjustable |
| Cooling type | Water cooling | Water cooling | |
| Total power | 65kw | 21.8kw | 7.4kw |
| Size | 6000*1900*1650mm | 3450*590*1250mm | 1800*530*1250mm |
| Weight | 2500kg | 500kg | 240kg |
When evaluating a PVC conveyor tunnel oven for high-efficiency production, several specific engineering features determine performance:
Independent Multi-Zone Temperature Control: High-quality lines divide the tunnel into multiple heating zones. The entrance needs higher heat to kickstart plasticization, while later zones maintain a steady soak to prevent overheating or yellowing.
Speed Adjustment (Inverter Control): The conveyor belt speed must be precisely controlled via a variable frequency drive (VFD). Thicker molds or parts require a slower belt speed to give the heat enough time to penetrate to the core.
Exhaust Fan System: Melting PVC plastisol releases plasticizer fumes and vaporized oils. Built-in exhaust hoods at the tunnel ends are crucial to pull smoke out of the workshop and keep the oven interior clean.
Belt Material Options:
Teflon / Mesh Belts: Standard for lightweight items; provides smooth movement and good air circulation.
Stainless Steel Mesh / Chain Belts: Highly durable, excellent for heavy aluminum molds or higher-temperature setups.
Production Layout Types
Depending on workshop space and automation level, conveyor ovens are typically built in two configurations:
Straight-Line Tunnel
Molds enter at one end and exit at the opposite end. Ideal for long factories where the dispensing machine sits at the front and a dedicated packing/stripping team sits at the back.
U-Turn / Return-Loop System
The conveyor belt brings the molds back to the starting point after they pass through the heating and cooling zones. This saves massive floor space and allows the same operator who manages dispensing to strip the finished parts.
The difference beween PVC oven and Silicone oven
While both PVC and silicone industrial ovens are used to apply heat to raw materials to form a finished product, they serve entirely different material processes. Choosing the right one depends on whether you are working with thermoplastics (PVC) or thermosetting elastomers (silicone).
Because the production workflows differ, the physical layout of the ovens often changes to match the automation level of the line.
For micro-injection or automatic dispensing of multi-color PVC items (like keychains, labels, and shoe charms), a conveyor tunnel oven is standard. Liquid PVC is dripped into aluminum or brass molds, which then pass continuously through the heating tunnel.
Key Advantage: Allows for a continuous, fast-paced production line where molds are filled, baked, cooled, and stripped in a cyclical loop.
While silicone can also use tunnel ovens for certain profiles or extruded parts, molded silicone parts or secondary "post-curing" steps frequently use heavy-duty cabinet batch ovens.
Key Advantage: Provides the precise, highly uniform internal temperature stability required to complete the chemical cross-linking process evenly across thick or high-precision parts (such as O-rings, gaskets, or medical components).
emperature Limitations: A standard PVC oven may struggle to reach or safely maintain the higher temperatures (>230℃) required for rapid silicone vulcanization or extended post-curing cycles.
Contamination Risks: Baking silicone in an oven previously coated with greasy PVC plasticizer residue can ruin the silicone's surface properties, clarity, and material purity.
Airflow vs. Surface Heat: PVC plastisol needs fast surface gelling to lock multi-color designs in place before they bleed together. Silicone requires deep, uniform heat soaking to ensure the core of the material cures at the same rate as the exterior.
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Silicone Label Embossing Machines,
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