Plastic cup

Common materials include PP, PS, PET, and PLA. PP (polypropylene) offers excellent heat resistance for hot-fill applications like coffee or tea cups, while PET provides superior clarity and gloss for cold beverages. PS is cost-effective for general-purpose use, and PLA is a biodegradable option for eco-conscious brands seeking sustainable packaging solutions.

A plastic sheet is unwound from a roll and fed into the thermoforming machine, where it passes through an oven to reach the optimal forming temperature. The heated sheet is then drawn into a cup-shaped mold using vacuum or pressure, cooled to set the shape, and trimmed to remove excess material. Finally, the formed cups are stacked and counted for packaging.

Uneven wall thickness typically results from inconsistent sheet heating, improper plug-assist design, or unbalanced vacuum pressure during forming. To prevent this, ensure the heating system is properly calibrated for your specific material, use a well-designed plug that matches your cup geometry, and maintain consistent vacuum levels throughout the forming cycle.

Surface defects often stem from contaminated raw material, dust accumulation on the sheet, or excessive heating that degrades the polymer. Implement strict material screening and handling procedures, clean the sheet surface before forming, and optimize heating parameters to prevent scorching. Regular mold maintenance and polishing also help eliminate scratches on the final product.

Production speeds typically range from 20 to 40 cycles per minute, depending on cup size, material thickness, and mold cavity count. Smaller cups with thin walls can achieve higher speeds, while larger or thicker cups require longer heating and cooling times, reducing overall output. Multi-cavity molds can significantly increase total production per minute.