The High-efficiency Inner Tube Curing Machine For Motorcycle Inner
Tube Production Has A Capacity Of 3,000 Tubes Per Hour
Introduction to Inner Tube Curing Machine:
The vulcanizing machine in the production of motorcycle inner tubes
is a key piece of equipment in the manufacturing process. It is
mainly used to heat and pressurize the formed raw tubes
(unvulcanized rubber blanks) to make them undergo vulcanization
reactions, thereby endowing the inner tubes with elasticity,
strength and durability. The following is a detailed introduction
to the inner tube vulcanizing machine for motorcycles:
The function of the vulcanizing machine
Vulcanization reaction: By heating (typically 140°C to 160°C) and
applying pressure, the rubber molecular chains are cross-linked,
enhancing the physical properties of the inner tube (such as tear
resistance and aging resistance).
Shaping: Ensure that the inner tube shape is stable and meets the
standard size (such as the common 17 inches, 18 inches, etc. on
motorcycles).
2. Main types of vulcanizing machines
(1) Individual vulcanizing machine (single-mode vulcanizing
machine)
Features: A single mold works independently, suitable for
small-batch or multi-specification production.
Applicable scenarios: Small and medium-sized inner tube factories
or situations where molds need to be frequently changed.
(2) Automatic vulcanizing machine (multi-mode vulcanizing machine)
Features: Multi-station design, high degree of automation
(automatic mold opening, closing, and exhaust), and high
efficiency.
Applicable scenarios: Large-scale production, such as a production
line for motorcycle tires.
(3) Vacuum vulcanizing machine
Feature: Vacuuming is carried out before vulcanization to prevent
air bubbles inside the inner tube and increase the yield of
finished products.
Advantages: Suitable for the production of high-end inner tubes or
Butyl inner tubes.
3. The core structure of the vulcanizing machine
Molds: They are divided into upper and lower molds, engraved with
tire patterns and specification marks, and are mostly made of alloy
steel.
Heating system: Electric heating or steam heating (steam is more
uniform, but it needs to be matched with a boiler).
Hydraulic system: Provides clamping pressure (typically 10 to
20MPa) to ensure sealing during the vulcanization process.
Control system: PLC automatically controls temperature and
pressure, and records the vulcanization time curve.
4. Key parameters of vulcanization process
Temperature: Butyl rubber is commonly used at 150°C to 160°C, while
natural rubber is slightly lower.
Pressure: The pressure inside the mold needs to be stable
(1.5-2.5MPa).
Time: Adjust according to thickness (usually 5 to 10 minutes for
motorcycle inner tubes).
5. Example of production process
Preparation of rubber blanks: Extruded inner tube rubber blanks
(including valve spouts).
Mold installation: Place the rubber blank into the preheated mold,
and align the valve orifice with the positioning holes.
Vulcanization: The mold is closed, pressurized and heated. After
vulcanization is completed, the mold is automatically opened.
Post-processing: Trim burrs and conduct air tightness testing.
6. Selection suggestions
Output: Single-mode is selected for small batches, and multi-mode
automatic lines are chosen for large batches.
Energy: Electric heating is convenient but costly, while steam
heating requires a boiler.
Mold compatibility: Supports mold replacement to adapt to different
types of inner tubes (such as off-road vehicles/scooters).
7. Common Problems and Solutions
Insufficient vulcanization: Check the temperature uniformity or
extend the vulcanization time.
Bubble defect: Switch to a vacuum vulcanizing machine or optimize
the exhaust of the rubber compound.
Mold adhesion: Regularly clean the mold and use a mold release
agent.
Motorcycle Inner Tube Vulcanizing Machine Technical Parameters
| Parameter | Specification | Remarks |
|---|
| Model | MT-VS200 | Customizable for different tube sizes |
| Vulcanization Method | Steam/Electric Heating | Optional heating systems |
| Mold Type | Single/Multi-cavity | 1~4 cavities per mold |
| Mold Material | Alloy Steel (HRC 45-50) | Hardened for durability |
| Max. Vulcanization Pressure | 20 MPa | Adjustable via hydraulic system |
| Temperature Range | 140°C ~ 170°C | PID-controlled (±1°C accuracy) |
| Heating Power | 15 kW (Electric) / 0.8 MPa Steam Pressure | Depends on model |
| Hydraulic Pressure | 10~15 MPa | Ensures tight mold sealing |
| Plate Size (L×W) | 600×600 mm | Fits 12″~21″ motorcycle tubes |
| Daylight Opening | 250 mm | Space for mold installation |
| Cycle Time | 5~10 min per tube | Depends on tube thickness |
| Automation Level | Semi-auto / Full-auto (PLC + HMI) | With auto mold opening & ejection |
| Air Supply | 0.6~0.8 MPa, 0.5 m³/min | For pneumatic components |
| Power Supply | 380V, 50Hz, 3-phase | Standard industrial voltage |
| Weight | ~2,500 kg | Varies by configuration |
| Production Capacity | 200~500 tubes/day (single shift) | Multi-cavity molds increase output |
Inner tube process flow
Inner tubes are indispensable components on vehicles such as
bicycles, motorcycles and cars. They are responsible for bearing
the weight of the vehicle and withstanding the impact of the road
surface. Therefore, their manufacturing process is of great
significance. The following is a brief introduction to the inner
tube process flow:
1. Raw material selection: The raw materials for inner tubes are
usually natural rubber and synthetic rubber. Before the process
flow begins, the selection and mixing of raw materials must be
carried out first to ensure that the inner tube has sufficient
flexibility and wear resistance.
2. Mold making: The formation of inner tubes requires the aid of
molds, so the design and manufacture of molds should be based on
the size and shape of the inner tubes.
3. Mixing and molding: The rubber that has been mixed with raw
materials is placed in a mixer for heating and mixing, and then
extruded into position through an extruder
4. Molding and vulcanization: Rubber is molded through molds, and
then the molded inner tubes are placed in a vulcanizing machine for
vulcanization treatment to enhance the strength and wear resistance
of the rubber.
5. Inspection and Packaging: Quality inspection is carried out on
the inner tubes produced to ensure they meet the standard
requirements. Then, they are packaged and sent to warehouses and
other places for storage and distribution.
Although the production process of inner tubes is simple, the
involved process steps are very complicated. Every link needs to be
strictly controlled to ensure the stable quality of the inner tubes
produced. With the development of technology and the improvement of
craftsmanship, the production process of inner tubes is constantly
being refined and enhanced to meet people's demands for safety,
comfort and durability.
