How to optimize the thread structure of 30mm PET preforms to improve the matching degree of bottle caps?

The thread structure of the PET preform has an important impact on the matching, sealing and user experience of the bottle cap. Optimizing the thread design of the 30mm PET preform can not only improve the tightness of the bottle cap, but also reduce the risk of leakage and improve the overall quality of the product. The following aspects are the key points to optimize the thread structure:

1. Accurately control the thread size and tolerance
The parameters of the preform thread, such as diameter, pitch, and tooth angle, need to strictly comply with industry standards, such as PCO 1881, PCO 1810, etc., to ensure the tight fit of the bottle cap. A reasonable tolerance range can avoid the difficulty of screwing the cap due to too tight threads, or the poor sealing due to too loose threads.

2. Adopt optimized thread tooth design
Common PET bottle mouth thread tooth profiles include square teeth, triangular teeth, and trapezoidal teeth, etc. Different tooth profiles have different effects on sealing and torque transmission. For example:

Trapezoidal teeth are suitable for high-pressure carbonated beverage bottles and can withstand greater internal pressure;
Square teeth are suitable for low-pressure bottled water, can provide stable sealing and easy to screw on;
Optimized triangular teeth can reduce material usage and improve production efficiency while ensuring sealing.

3. Add anti-slip design to improve screwing efficiency
Adding anti-slip protrusions on the top of the thread or under the bottle mouth can provide additional friction during the screwing process, making the bottle cap easier to tighten, improving the sealing stability, and reducing the risk of damage to the bottle mouth of the bottle preform by the screwing machine.

4. Control thread accuracy and reduce deformation
During the injection molding process of the bottle preform, the thread part may be deformed due to uneven cooling or insufficient mold accuracy. Optimizing the cooling system and improving mold accuracy can effectively reduce the deviation of the bottle mouth thread and improve the matching degree of the bottle cap.

5. Use high-precision detection technology to ensure consistency
High-precision detection technologies such as laser measurement and image detection can be introduced in the production process to ensure that the thread size and shape of each batch of bottle preforms are consistent, reducing the cap matching problem caused by bottle mouth errors.