Ultrasonic Sealing Paper Cup System

Product Description:

The ultrasonic sealing paper cup system consists of three core components, it included an intelligent frequency tracking ultrasonic generator, a high-power ultrasonic transducer, and a hardened aluminum alloy tool head. It is good performance in paper cup sealing applications, and with real-time automatic frequency tracking, high amplitude output, stable and reliable welding quality, and longer service life than ordinary welding systems.

Ultrasonic sealing paper cup system machine features:

1. Automatic frequency tracking ultrasonic generator, real-time frequency tracking, RS485 communication, with frequency, current, power abnormal protection device;

2. High-Q high-power ultrasonic transducer, low impedance, strong output amplitude, low heat generation;

3. Ultrasonic tool head is made of high quality aluminum alloy, surface hardening treatment, longer service life;

4. Ultrasonic welding quality is stable and fast, up to 150 times per minute.

Technical Parameters of ultrasonic sealing paper cup system:

Application:

1. Single-layer cold/hot drink paper cups
Used for milk tea, cola, and office drinking water disposable cups. Ultrasonic welding is applied to the side seam of the cup body - glue-free, leak-proof, and compatible with single-sided or double-sided PE-coated paper.

2. Double-layer insulated coffee cups / corrugated cups
Designed for hot drinks in chain coffee shops. The inner cup body is welded, and the outer sleeve is attached via ultrasonic bonding - heat-resistant, with welded seams that withstand high temperatures without cracking.

3. Bakery-specific paper cups
Includes cake liners and tulip baking cups. Food-grade, glue-free ultrasonic welding ensures the seams remain intact under high-temperature baking conditions.

4. Large-capacity takeout paper buckets
Used for soup and noodle containers. Wide-edge ultrasonic sealing ensures leak-proof performance during long-distance takeout delivery.

FAQ:

What are the specific advantages of ultrasonic welding over traditional adhesive bonding regarding the sealing performance of paper cups?
Adhesive bonding merely joins the surfaces of two paper layers, leaving a distinct layer of glue in between; exposure to hot or cold liquids or prolonged storage can cause the adhesive to soften or delaminate, leading to gaps and leakage. In contrast, ultrasonic welding uses high-frequency friction to melt the PE coating on the paper, fusing the PE layers from both sides into a single, seamless, and fully sealed film. This creates a molecular bond with no intermediate interlayer, making it impermeable to liquids.

With adhesive-bonded cups, high-temperature beverages (such as coffee or boiling water at 80–95°C) can rapidly soften water-based or starch-based adhesives, causing the seams to separate and leak, while low temperatures can make the adhesive brittle and prone to cracking. The PE film formed by ultrasonic welding withstands temperatures ranging from -20°C to 100°C; the seal does not soften when holding hot milk tea, ice water, or hot soup, ensuring that even double-walled insulated coffee cups remain leak-free during prolonged use with hot beverages.

Is the welding strength of the ultrasonic sealing paper cup System stable? Will there be any issues like weak welds or incomplete sealing?

Our ultrasonic sealing paper cup system ensures consistent weld strength during mass production.
1. A digital generator with automatic frequency tracking provides stable energy output, ensuring uniform fusion energy for every cup.
2. Constant air pressure control guarantees even clamping force, preventing uneven welding.
3. Dual control modes-time-based and depth-based-ensure consistent melt thickness of the PE coating.

Instances of "cold welding" (insufficient weld strength) typically occur only under the following conditions:
1. Poor quality of PE-coated paper, moisture in raw materials, or excessively thick printing ink;
2. Loose or worn welding molds (horns) that have not undergone regular adjustment;
3. Improper welding parameter settings or unstable air pressure.

Equipment design features addressing cold welding issues:
1. Automatic alarm and shutdown upon abnormal energy output to prevent the production of defective units;
2. Use of wear-resistant welding molds to ensure long-term production stability;
3. Easy parameter adjustment for rapid resolution of insufficient weld strength issues.

When using qualified raw materials and correct parameter settings, any structural failure under stress occurs in the paper body rather than at the weld seam, thereby eliminating batch-related cold welding problems.

For more details of Ultrasonic Sealing Paper Cup System, please feel free to contact us!