The Plastic Spout Cap features a two-component design: an outer screw cap and a separate inner spout. It consists of a red outer screw cap and a semi-transparent spout body. This split design facilitates assembly, enhances sealing stability, and improves ease of use, making it suitable for flexible packaging bags, spout pouches, and liquid packaging containers.

The outer screw cap is a thickened cylindrical structure with a flat top and evenly distributed, segmented, three-dimensional gripping areas along the edges. This design increases friction, allowing for easy one-handed opening and closing, even with wet or oily hands. The cap's internal precision thread structure tightly engages with the spout's external thread, ensuring a high degree of fit and effectively preventing loosening and leakage.

The inner spout is made of a single piece of semi-transparent plastic with a stepped, reinforced structure. Multiple positioning ribs and reinforcing rings at the bottom allow for heat sealing or compression fixing to the packaging bag or container opening, enhancing connection strength. The thickened central structure improves resistance to compression, preventing deformation during transportation and compression use. The top outlet features a cylindrical, straight-mouth structure with a rationally designed inner diameter to ensure smooth and stable liquid flow.

The product employs a dual leak-proof sealing design: Firstly, a physical seal is formed by the tight fit between the cap's threads and the nozzle opening; secondly, the nozzle top has a sealing plane or flange structure that, when tightened, creates a compression effect with the inside of the cap, further preventing air ingress and liquid leakage.

This structure is particularly suitable for packaging products such as sauces, fruit purees, detergents, and cleaning solutions that require repeated opening and use.

In terms of materials, both the outer cap and nozzle are injection molded from high-quality PP or PE materials, possessing excellent toughness, impact resistance, and chemical resistance. The red outer cap has a rich color and a smooth surface, enhancing product visibility; the semi-transparent nozzle allows for easy observation of the internal state, combining practicality and visual appeal.

The overall structural design balances sealing performance, strength, stability, and user experience, maintaining a good fit even under repeated tightening and loosening. The modular structure also allows for customization of colors, size adjustments, or functional upgrades to meet different product packaging needs.

This Plastic Spout Cap achieves a balance between secure sealing and ease of use through reasonable structural partitioning and detailed optimization. It is a commonly used and mature spout cap solution in the field of flexible packaging and liquid packaging.