Can Ultrasonic Be Used for Diapers Welding?

Views: 100 Author: Yvonne Han Publish Time: 2025-07-02 Origin: Site

The utility model relates to the technical field of diapers, in particular to an ultrasonic bonding structure for diapers, wherein the diapers include a main body component and a closure component for keeping the main body component on the wearer, wherein the main body component includes a leakproof edge non-woven fabric, and the closure component includes a rear elastic large side ear, wherein the rear elastic large side ear is compounded with the main body component and the leakproof edge non-woven fabric, and then directly reinforced and thermally bonded by ultrasonic hot pressing points to form ultrasonic thermal bonding points, and the ultrasonic thermal bonding points are located on the lower side of the leakproof edge non-woven fabric and do not directly contact the human body. The structure allows the rear elastic large side ear to be compounded with the main body component and the leakproof edge non-woven fabric, and then directly reinforced and thermally bonded by ultrasonic hot pressing points to form ultrasonic thermal bonding points, so that the ultrasonic thermal bonding points are placed on the lower side of the leakproof edge non-woven fabric to avoid the bonding points from abrading the baby's skin. Compared with glue sealing, ultrasonic welding has better softness in the later stage, making the diapers softer and more comfortable.

The method of making diaper connecting parts using ultrasonic technology, two or four elastic ear pieces are overlapped on both sides of the front and back waist areas of the diaper body, and ultrasonic technology is used to connect the elastic ear pieces or left and right stickers with the diaper body; the elastic ear pieces or left and right stickers are connected to the diaper body using ultrasonic special performance technology, and the connection is more reliable, and the product avoids the use of chemical adhesives during the production process, which saves materials and makes the product more environmentally friendly.

1(1)

A diaper (growing pants/pull-up pants) uses 53 elastic bands. To sew the elastic bands to the diaper, two technologies are required: ultrasonic elastic line welding technology and elastic tension system. The diapers made in this way can be free of marks, no falling, no side leakage, no glue sewing, more comfortable, and reduce allergens.

Ultrasonic welding technology is widely used and efficient in the production of diapers. It mainly uses the heat generated by high-frequency vibration to achieve rapid bonding of materials. The following are its specific applications and advantages: 1. Core application link

Multi-layer material composite

Non-woven fabrics, absorbent cores, leak-proof membranes and other laminated materials are fixed by ultrasonic welding to replace traditional adhesives, avoiding glue curing time or chemical residue problems.

Elastic component fixation

Elastic bands (such as rubber bands) of waist and leg circumferences are directly welded on non-woven fabrics to accurately control tension and improve comfort and fit.

Edge sealing and molding

The welding of side edges and waist stickers achieves seamless sealing, avoids rough stitches, and enhances leak-proofness (such as three-dimensional guards).

2091517

Breathable hole processing

Breathable micropores are formed on the surface non-woven fabric through ultrasonic punching to improve breathability and no burrs.

2. Technical advantages

High efficiency and energy saving

The welding time is short (0.1~1 second), no preheating or cooling is required, and the energy consumption is only 10%~30% of heat sealing.

Environmentally friendly and safe

No glue volatilization, reducing VOCs emissions, and meeting the hygiene standards of baby products.

High-precision control

Digitally adjust the amplitude, pressure and time to adapt to different materials (such as SMMS non-woven fabrics, PE films).

Strength and beauty

The weld is uniform and has no glue overflow, high tensile strength, and avoids thread defects in traditional sewing.

3. Process challenges and countermeasures

Material adaptability

Parameters need to be adjusted according to the melting point of the material (such as PP non-woven fabrics about 160℃) to avoid overheating and perforation.

Welding head design

The flower wheel welding head (pattern roller) needs to be customized with tooth shape to adapt to different seam shapes (such as continuous spot welding or dotted line welding).

Equipment maintenance

Regularly clean the welding head residue to prevent frequency drift from affecting welding quality.

Advantages:

1. No consumables, low cost: no consumables are required;

2. Environmentally friendly, energy-saving, green and safe: no harmful gases and smoke are produced;

3. Simple and easy to learn;

4. Wide range of applications;

5. A wide range of processable materials;

6. Compact equipment structure;

7. Simple maintenance;

8. Product diversification;

9. Broad application areas;