The diverse forms of PVC craft products stem from the precise empowerment of different production processes. Injection molding, roto-casting, and thermoforming are the three core processing methods for PVC craft products, each with its unique principles, advantages, and applicable scenarios. A deep understanding of the differences between these processes can help us better understand product characteristics and provide references for procurement and customization of different needs.
Injection molding is the most commonly used mass production method for PVC products. The principle involves injecting molten PVC raw materials into the mold cavity under high pressure through an injection molding machine, which forms the product after cooling and solidification. The core advantages of this process are high production efficiency, high precision, and the ability to achieve mass production of complex shapes and fine patterns. The products exhibit uniform hardness and stable structure. It has a wide range of applicable scenarios, including hard PVC decorative ornaments, toy models, industrial accessories, and household storage boxes. Injection molding requires high precision for molds, with high initial mold investment costs, making it suitable for large-scale mass production. During the production process, different additives can be added to adjust the hardness, toughness, and color of the product, adapting to diverse needs.
The roto-casting process (also known as the soft rubber process) is primarily used for producing soft PVC products. The principle involves pouring PVC paste resin into a heated mold, and through the rotation of the mold, the resin is evenly attached to the inner wall of the mold. After cooling, the mold is removed to form the product. Its core advantage lies in its ability to produce soft, elastic products with a fine texture, suitable for simulating soft textures such as human bodies and animals. The applicable scenarios are mainly soft toys, such as roto-casting dolls, baby teething toys, bath toys, etc., but it can also be used for producing soft decorative accessories and seals. The roto-casting process has a relatively long production cycle, suitable for small and medium-sized batch production; the product safety is high, and through the blending of compliant additives, it can meet food-grade standards, widely used in the field of children’s products.
The blister process is primarily utilized for manufacturing PVC sheet products. The principle involves heating and softening the PVC sheet, then adhering it to the mold surface through vacuum adsorption. After cooling and solidification, the sheet is cut into desired shapes. The core advantage of this process lies in its fast production speed and low cost, making it suitable for manufacturing large-area, thin-walled products such as PVC packaging boxes, display covers, decorative panels, and billboards. Products produced by the blister process often feature a hollow or thin-sheet structure, with relatively low hardness and limited load-bearing capacity, primarily intended for packaging and decorative purposes. Depending on product requirements, transparent, colored, or patterned PVC sheets can be selected, and subsequent processes such as laminating and printing can be applied to enhance the aesthetics and practicality of the product.