Rubber Foaming Softening Tunnel Oven

The Rubber Foaming Softening Tunnel Oven is an industrial tunnel-type heating system designed for the continuous foaming, vulcanization, drying, and softening treatment of rubber materials. It is widely used in continuous production processes requiring precise temperature control, uniform heating, and stable material properties.

Main Applications

1. Automotive Sealing Strips

Used for manufacturing rubber foamed sealing strips for vehicle doors, windows, and engine compartments.

2. Thermal Insulation Building Materials

Used for producing NBR/PVC foamed insulation pipes, insulation boards, and other thermal insulation products.

3. Footwear and Luggage Materials

Used for continuous curing and shaping of EVA or natural rubber foamed soles and luggage lining materials.

4. Sports Equipment

Used for manufacturing high-elasticity foamed products such as handle grips, yoga mats, and protective cushioning materials.

5. Industrial Cushioning Materials

Used for producing various vibration-damping, noise-reduction, and sealing foam pads for mechanical equipment.

Applicable Standards

GB/T 20051 — General Technical Conditions for Continuous Rubber Vulcanization Equipment

GB 5226.1 / EN 60204-1 — Safety of Machinery — Electrical Equipment of Machines — Part 1: General Requirements

GB 30720 — Energy Consumption Limits for Continuous Drying Furnaces Used in Rubber Processing Products Industry

HG/T 3228 — General Technical Conditions for Rubber Machinery

Equipment Features

1. Precise Temperature Control

The equipment adopts multi-zone independent microcomputer PID temperature control, with temperature differences controlled within ±1°C, ensuring stable processing conditions.

2. High Uniformity of Rubber Foaming

The scientifically designed hot air circulation system ensures that both the rubber surface and internal core are heated evenly and simultaneously, achieving consistent foaming performance.

3. Multiple Conveyor Options

According to different production processes, the oven can be equipped with:

PTFE (Teflon) mesh belt

Stainless steel mesh belt

Slat-type conveyor chain

to meet different rubber processing requirements.

4. High Efficiency, Energy Saving, and Environmental Protection

The oven body adopts high-density thermal insulation materials and is equipped with interfaces for:

Secondary combustion treatment of exhaust gases

Exhaust purification and collection systems

to improve energy efficiency and environmental performance.

5. Variable Frequency Stepless Speed Control

The conveyor speed can be precisely adjusted according to the foaming time requirements of different rubber formulations, ensuring optimal curing and foaming results.

FAQ

Q1: What heating methods are commonly used in this equipment?

A:The main heating methods include electric heating, direct combustion heating using natural gas or LPG, and steam or thermal oil heat exchange heating. Among them, electric heating and gas-fired hot air circulation heating are the most commonly used solutions.

Q2: How does the equipment prevent foamed rubber from sticking to the conveyor belt during processing?

A:The conveyor surface is usually coated with a PTFE (Teflon) non-stick layer. Alternatively, release agents or talcum powder can be sprayed onto the rubber before entering the oven. For certain processes, suspended conveyor systems or pin-type conveyors may also be used to prevent sticking.

Q3: What are the typical length and width dimensions of a tunnel oven?

A:The equipment is a customized product designed according to production capacity and process requirements. The typical oven length is generally between 12 meters and 30 meters, while the effective working width is usually between 400 mm and 1500 mm.

Q4: Why do pits or uneven bubbles appear on the surface of foamed rubber products after processing?

A:This problem is usually related to excessively high temperature in the initial heating zone, which causes premature surface curing, or uneven hot air circulation inside the oven. The temperature gradient curve of multiple heating zones should be optimized, typically following a lower temperature at the front section and higher temperature at the rear section to achieve uniform foaming.

Q5: How are exhaust gases generated during rubber vulcanization treated during equipment operation?

A:The tunnel oven is equipped with exhaust ducts on the top. The generated gases are collected and transported through pipelines to treatment systems such as:

Activated carbon adsorption units

UV photo-oxidation catalytic systems

Catalytic combustion (CO) systems

The exhaust gases can only be discharged after meeting environmental emission requirements.

The Rubber Foaming Softening Tunnel Oven provides an efficient and stable continuous processing solution for rubber product manufacturers. With advantages including precise temperature control, uniform foaming, flexible conveyor configurations, and energy-saving operation, it is widely applied in automotive, construction, footwear, sports equipment, and industrial rubber product industries.