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Today, Kuoshi provided training to the company's employees on the trunk storage box products. The training mainly covered the production process of the trunk storage box:
1. Material and Process
1.1 Main Materials
- Fabric Type
The factory specializes in producing fabric-based folding storage boxes.
- Oxford Cloth / Polyester
- Features: Lightweight, wear-resistant, foldable, and low cost.
- Process: Mainly sewing process, with internal support boards (PP board / density board) for shaping and edge binding treatment to prevent wear.
2. Auxiliary Materials
- Hardware Accessories: Metal buckles, zippers, handles, etc., are rust-proofed through electroplating processes (such as zinc plating and nickel plating).
- Anti-slip Materials: EVA anti-slip pads or rubber strips are added to the bottom of the box and fixed through bonding or heat pressing processes.
II. Structural Design and Craftsmanship
1. Space Planning
- Layered Design:
- Built-in adjustable partitions (PP material snap-on or Velcro connection) to meet the classification needs of different items.
- Drawer Structure: Multi-layer storage achieved through guide rails for smooth sliding, enhancing accessibility.
- Folding Craftsmanship:
- Rigid boxes adopt "X-shaped" or "cross-shaped" folding structures, connected by hinges or pivots, reducing volume by over 50% when folded.
- Soft boxes utilize fabric elasticity and foldable inserts, allowing them to be completely flattened when stored.
2. Functional Structure
- Fixing Devices:
- Elastic mesh bags (sewn) or elastic bands (sewn in) are installed inside the box to prevent items from shaking.
- External straps (nylon material, with metal buckles) are added to secure the box in the trunk and prevent it from sliding.
- Opening and Closing Methods:
- Hinged lid type: The box lid is connected by hinges and closed with a snap (plastic/metal) or zipper.
- Side-opening type: Suitable for narrow
III. Production and Processing Technology
1. Injection Molding (Mainstream Process for Rigid Boxes)
- Process:
Mold Design: Steel molds are made based on the box structure (with high precision requirements, error ±0.1mm).
Raw Material Melting: PP particles are heated to 220-260℃ to melt into a fluid.
High-Pressure Injection: Injected into the mold cavity, cooled and set, then the mold is opened to remove the roughcast.
Post-Processing: Deburring, drilling (for accessory installation), and surface spraying (such as matte paint).
- Advantages: High production efficiency, low unit cost, suitable for large-scale standardized production.
2. Blow molding process (mostly used for large-capacity boxes)
- Process:
Heat PE raw materials to form a tubular parison.
Close the mold to hold the parison and inject compressed air to make it expand and fit the inner wall of the mold.
After cooling, demold and cut the bottom to form a box.
- Features: Uniform wall thickness, strong impact resistance, suitable for making large-capacity storage boxes without partitions.
3. Sewing Process (Fabric Storage Box)
- Process:
Fabric Cutting: Cut Oxford fabric, backing board, and other materials according to the designed dimensions.
Sewing and Assembly: Use industrial sewing machines to stitch together all components and reinforce stress points (such as the connection of the handle).
Accessories Installation: Sew zippers, attach buttons, and stick Velcro, etc.
- Key Techniques: Double-threaded sewing to prevent unraveling, and hemming to enhance the durability of the edges.
4. Welding Process (Metal/Plastic Composite Structure)
- Ultrasonic welding: Used for seamless connection of plastic parts (such as clips, dividers), generating heat through high-frequency vibration to fuse the contact surfaces.
- Laser welding: Laser spot welding is applied at the joints of metal boxes, featuring high precision and aesthetically pleasing weld seams.
IV. Surface Treatment Process
Fabric Surface Treatment:
- Waterproof Coating: Oxford fabric is coated with a layer of PVC or PU on its surface, and the waterproof function is achieved through a heat-pressing process.
IV. Surface Treatment Process
Fabric Surface Treatment:
- Waterproof Coating: Oxford fabric is coated with a layer of PVC or PU on its surface, and the waterproof function is achieved through a heat-pressing process.
V. Quality Control Process
1. Load-bearing Test: Static load for 48 hours under full load, and measure the deformation of the box (usually ≤5mm).
2. Impact Resistance Test: Drop freely from a height of 1.5 meters and check for cracks (for plastic boxes).
3. Environmental Protection Test: Materials must pass ROHS certification to ensure no formaldehyde, phthalates or other harmful substances.
4. Opening and Closing Life Test: Open and close the snap fasteners / zippers more than 5000 times to check for jamming or damage.
VI. Trends in Innovative Processes
1. Modular Design: The box can be quickly installed with the trunk's fixed anchor points (such as reserved holes in the car) through snap fasteners.
2. Smart Storage: Equipped with an integrated PCB circuit board and a built-in weighing sensor, the load data is displayed in real-time on the mobile phone APP.
3. Application of Eco-friendly Materials: The usage rate of recyclable PP material (PCR-PP) has been increased to over 80%, reducing plastic pollution.
These are the contents of today's training. We hope they are helpful to you.
Kuoshi specializes in the production of fabric trunk storage boxes and has 15 years of experience. If you want to customize trunk storage boxes, please contact us:
Web：https://www.kuoshiauto.com/
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