The manufacturing process of pillow cores varies depending on the filling materials and the level of automation. However, the core processes typically include raw material preparation, filling material processing, quantitative filling, packaging, and post-processing. Modern production has shifted from traditional manual methods to automated production lines, significantly improving efficiency and consistency.
1. Raw Material Preparation and Opening Process
Production begins with raw materials. Common filling materials include polyester fiber (PP cotton), down, memory foam, latex, and buckwheat hulls. Taking synthetic fiber pillow cores as an example, the raw material is usually bulk compressed polyethylene resin fiber. These fibers need to be broken up and combed using an opening machine. Steel-barbed rollers separate the fibers into a fluffy state, while an antistatic solution is sprayed to prevent fire.
2. Deep Processing and Shaping
Synthetic Fiber/Down: After opening, the fibers enter a cotton carding machine or filling machine for further deep combing, removing clumps and making the fibers straighter and fluffier. They are then pressed into a flat fiber mesh belt via a conveyor belt and cut and wound according to the pillow size.
Memory Foam/Latex Pillows: Memory foam is produced using a polyurethane foaming process. It is injected into a mold through high-pressure foaming equipment, cured, and cut into the desired shape.
Latex pillows mostly use the Dunlop or Talalay processes. The Dunlop process involves chemically foaming latex raw material with a foaming agent, then injecting it into a mold and steaming/vulcanizing it. The finished product has a closed-cell structure, providing strong support but is relatively firm.
3. Quantitative Filling and Automated Assembly
This is a crucial step in pillow core production. Modern factories commonly use pillow core machines (also known as filling machines) to achieve precise filling:
The equipment has frequency conversion control and a weighing system, allowing the setting of the filling weight (typically 150g–1500g) with an error controlled within ±100g.
Fully automated production lines can integrate functions such as opening, conveying, filling, and sealing. A single machine can produce 300–550kg of pillow cores per hour, equivalent to the workload of 10–15 workers.
During operation, workers simply place the pillowcase over the filling port, and the equipment automatically completes the filling. Some high-end lines also feature CNC cutting and curing management.
4. Sealing and Post-Processing After filling, the pillow core is sealed manually or using automatic sewing equipment, followed by quality inspection, air drying (natural materials require sun sterilization), and packaging. For latex or memory foam products, rinsing, drying, and trimming are also required to remove odors and residual chemicals.