KNMTech  SONIC provides one-stop solutions for ultrasonic welding plastic, for high-quality joining applications in automotive, packaging, medical devices, electronics, etc. from welding small delicate elements to large plastic parts.

  •  SGS, CE, ISO9001 证书;
  • 在超声波焊接业务方面拥有超过15年的专业知识;
  • Standard, Advanced, Excellent, and customized series sonic welders for plastic available;
  • Strictly standardized production lines provide you with high-quality ultrasonic plastic welding machine.
  • 经验丰富的服务团队提供高质量的售前和售后服务


Ultrasonic welding machines can weld all thermoplastics. 

标星 ultrasonic plastic welding machines are very popular with our customers for their clean, energy-saving, eco-friendly, high efficient, and highly stable features. Knmtech offers four series(Standard, Advanced, Excellent, Servo) of ultrasonic plastic welders(15kHz, 20kHz, 35kHz, and 40kHz), as well as customized automatic welders to meet your joining needs, and we design, develop and manufacture the customized toolings/horns (steel/aluminium/titanium), which is durable and wear resistant.

Ultrasonic Plastic Welding Machine DX5 series in main page

DX5 series with high precision. Servo motion control system. With 6 welding modes. Support IoT. High-end plastic ultrasonic welding equipment.

ultrasonic plastic welder FU2025 series

This machine is the perfect pneumatically controlled ultrasonic welding equipment
Trigger mode: time/pressure/depth. Multifunctional welding.

ultrasonic plastic welding machine PTS2000 series3

Advanced series. Pneumatic control system. Trigger mode: time/pressure. Achieve a higher performance ratio. Hot-selling plastic ultrasonic welding equipment.

ultrasonic plastic welding equipment -DS400

Standard series. Pneumatic control system. Trigger mode: time/external. Basic entry-level pop-up machine. Hot-selling plastic ultrasonic welding equipment.

Ultrasonic actuator for Automation Line

KNMTECH offers ultrasonic welding system designs suitable for fully automated production.

handheld ultrasonic plastic welder-370-370

This handheld welder makes your welding scenes more diverse and the operation more portable.

35KHz Ultrasonic Handheld Welder from Knmtech

35KHz intelligent ultrasonic hand welder with a cooling system is suitable for industries including automotive, electronics, etc.

Ultrasonic Rotary Welding Machine DS400R with A turntable


ultrasonic spot welder-370-370


Ultrasonic Plastic Runner Removing Machine

Ultrasonic plastic runner remover, which is designed to streamline and enhance plastic manufacturing processes.

ultrasonic Plastic Welder with stable - FU2025_1


ultrasonic plastic welding machine with stable -PTS2000



high efficiency









DX5 series ultrasonic plastic sonic welder is an intelligent ultrasonic servo control press. Multi-stage welding speed control, pressure, and amplitude control; Welding result detection, graphical analysis for high precision and consistent welding results. It is almost the most high-end plastic ultrasonic welding equipment in China.

numberNo 流线型结构,10英寸触摸屏;

numberNo DXmax servo system, Multi-stage welding speed control, pressure, and amplitude control;

numberNo Multiple welding modes (time, energy, ground, absolute depth, relative depth);

numberNoSoft Touch mode support, 5ms acquisition frequency automatic tracking;

Ultrasonic Plastic Welding Machine DX5 series in main feature side
High Precision Ultrasonic Plastic Welding Machine With Multiple Functions


FU2025系列塑料声波焊接机是一种具有高适应性和高扩展性的智能型超声波气压机。配备了气动系统,并带有 智能超声波电箱配有多种焊接模式,带有焊缝图的高精度焊接过程控制。

numberNo 紧凑,电动滑轨升降系统;

numberNo 带刻度的行程限制系统,用于高精度控制;

numberNo 六种焊接模式和三种触发模式,满足复杂的焊接要求。



numberNo 电动滑轨升降系统;

numberNo 7英寸彩色触摸屏,操作直观;

numberNo 带刻度的行程限制系统,用于高精度控制;

Ultrasonic Plastic Welding Machine PTS2000 Series
Standard Ultrasonic Plastic Welding Machine DS400 series



numberNo 4.3寸内置触摸屏;

numberNo 100%数字控制超声波发生器;

numberNo 四重智能管理,确保精确的过程控制。

Why Choose KNMTECH Ultrasonic Welder For Sale?

Why Choose KNMTECH Ultrasonic Welder For Sale?KNMTECH ultrasonic welders are extremely stable. Moreover, we have fast delivery dates and provide perfect after-sales service. Choosing a KNMTECH  ultrasonic welder for sale is equivalent to choosing a stable machine, cost-effective products, comprehensive after-sales service, and a trustworthy friend.


超声波塑料焊接机配有一个数字式 超声波焊接系统,一个焊接管理系统,和一个数据管理系统来跟踪和监测焊接数据。一旦设定好,焊接的塑料产品具有良好的密封性能和高一致性,这大大降低了废品率。


For different plastic products, we support the design and customize special 超声波焊头 to enhance the utilization rate of the machine; We not only make the ultrasonic welding toolings, we know how to maximize the matching of molds with your products to achieve the best ultrasonic welding results.
因为 超声波塑料焊接机 具有输出和输入信号,可以与自动化设备连接,实现自动化操作。


ultrasonic welding machine factory
ultrasonic plastic welding machines


Knmtech Sonic can provide you with stable ultrasonic welding machines. The stability of the equipment is especially important for ultrasonic welding machines. Only when the ultrasonic welding machine can output ultrasonic waves stably can the production yield rate be improved.

We have different series of ultrasonic welding equipment for various applications and support non-standard machines and customized automation equipment. According to your product 3D drawings, materials, and requirements, we will provide free sample test welding and recommend suitable ultrasonic welding solutions for you.

Knmtech Sonic System is a professional ultrasonic welding machine manufacturer in China with an R&D team, operations team, assembly team, sales team, and after-sales service team. We also have agents abroad. If you need to wholesale and purchase ultrasonic welding machines for sale, welcome to our factory to consult. We get your back if you need the sonic welder for plastic parts. Feel free to reach out.


Application of Sonic Welder for Plastic

automotive dashboard


air filter


Medical Infusion Bag

The common material of the medical infusion bag is PP or TPE.Use ultrasonic to weld the medical infusion bag tightly, significantly reduce the volume of the sealing area, and ensure there is no air in the bag. With short welding time, excellent chemical and corrosion resistance, and high reliability.

Bluetooth headset

The common material of the Bluetooth headset is ABS or PC, the welding of the Bluetooth headset not only requires the welding seal to be free of spillage and has a beautiful appearance, but also to ensure that the internal electronic equipment will not be damaged due to welding. Ultrasonic welder can meet the above requirements through servo motors.

Electric iron


ultrasonic welding machine suppiler


  • "我们很高兴能找到像你们这样的超声波焊接供应商,服务很好,祝愿生意兴隆。"

  • "如果你的项目需要超声波塑料焊接技术,我强烈推荐上海标星科技发展有限公司,他们的团队在提供有价值的产品和服务方面很强大。"

  • "超声波焊接系统与我们的自动化设备运行良好。我们非常高兴能与你们合作"。


Before choosing ultra sonic welder for your plastic products, read the guide below; Here is a list that covers the frequently asked questions.

What is the principle of ultrasonic plastic welding?

The principle of ultrasonic plastic welding is not only related to the ultrasonic waves output by the machine. It also has something to do with the sound conductivity of the plastic and whether it is a thermoplastic.
Simply put, the principle of ultrasonic welding of plastics is that the contact surface of the plastic has poor conductivity of ultrasonic waves and the temperature will be higher. The high temperatures generated by ultrasonic waves cause the thermoplastic to undergo a glass transition temperature. Finally, the molecular chains of plastic slide and recombine, cool and weld to a strength comparable to the raw material.

What are the advantage of ultrasonic plastic welders?

Ultrasonic plastic welders have many advantages in the manufacturing and assembly of plastic components and are now acceptable in many industries. The common advantages are listed below:

1. Fast and Efficient:

Ultrasonic welding plastic can be done within 1 second or even less, which is fast and greatly improves the industry production efficiency.

2. No Consumables:

No like other traditional welding methods, ultrasonic welding technology needs no consumables, such as glues, screws, and other additional materials.

3. Energy-Efficient:

Ultrasonic welding technology uses focused ultrasonic vibration to generate heat only in the area that needs to be welded, which results in less energy consumption compared to other common heating methods.

4. Stable and chemically resistant:

Ultrasonic welding for plastics is the process of melting and reforming molecular bonds. The weld will be more stable than ordinary welding and resistant to chemical corrosion, making it suitable for the medical industry.

5. Reduced Material Distortion:

Because of the locally focused heat generated by the ultrasonic vibration of the ultrasonic welding technology, it minimizes the overall thermal impact on the surrounding material, which results in reduced material distortion or damage.

6. Vasatility:

Ultrasonic welding can be used for a wide range of thermoplastic materials, including hard-to-weld materials such as certain engineering plastics. It makes ultrasonic welding a preferred choice in various industries, including automotive, electronics, and medical devices.

7. Automation Compatibility:

Ultrasonic welding is adaptable to automation systems, which enhances precision, consistency, and overall production efficiency.

8. Environmentally Friendly:

Ultrasonic welding doesn’t involve the use of potentially harmful substances.

9. Joining Complex Geometries:

Ultrasonic welding is capable of joining parts with complex geometries and intricate designs, providing flexibility in the design and manufacturing of plastic components.

While ultrasonic plastic welding offers the advantages above, it’s essential to consider specific application requirements and material compatibility to determine the most suitable joining method for a given project. If you have plastic joining requirements, please first contact our professional team for expert suggestions.



Ultrasonic plastic welding uses ultrasonic waves to cause high temperatures and changes in the molecular layer of plastic parts. Therefore, ultrasonic plastic welding is permanent and irreversible.


Sure. Thermoplastics can be well welded by ultrasound. Common plastic types that can be welded by ultrasonic are acrylonitrile butadiene styrene(ABS), polystyrene(PS), polyvinyl chloride(PVC), polyphenylene oxide(PPO), Polypropylene(PP), Polyethylene(PE), Polycarbonate(PC), Pci Universal Communications(PUC), poly(methylmethacrylate(PMMA), Polyphenylene Sulfide(PPS), polybutylene terephthalate(PBT), Polyethylene terephthalate glycol(PETG), Polyamide(PA), Polyvinyl Chloride(PVC), etc.




1. 确定塑料制品的材料是否可以超声焊接。
2. 塑料制品的上下两部分的壁厚结构是否适合能量导体的定位。
3. 待焊产品的结构是平面结构还是凹凸结构。
任何问题,可以咨询我们的专业团队来获取帮助。随时联系我们! 联系我们。.


Ultrasonic bonding takes a short time so that the plastic products are instantly melted and fused, the welding is firm, and new molecular bonds are formed between the welding materials, making ultrasonic welding irreversible. The welding strength is close to the raw material, but the accessories cannot be disassembled and replaced.


Generally, a high-frequency welding machine is chosen. Under the same conditions, the amplitude of the machine will be smaller and it will not easily damage precision components. Currently, KNMSONIC’s ultrasonic welding machines can detect depth and pressure data in real-time, collect millisecond-level frequency, and support SOFT touch mode to protect sensitive welds.

Can PVC be ultrasonic welded?

Because PVC can conduct ultrasonic very well, and PVC is a thermoplastic, it is easy to weld PVC with ultrasonic. This article explains the principles of ultrasonic welding of PVC in more detail:Can PVC Be Plastic Welded?

What are the applications of the ultrasonic welding?

Ultrasonic welding is widely used across various industries for joining plastic components.

Here are some common applications of ultrasonic welding:

  1. Automotive Industry:
    • Joining various plastic components in the interior and exterior of vehicles, such as door panels, dashboard components, lights, and air vents.
  2. Electronics:
    • Bonding plastic parts in electronic devices, including the assembly of casings, connectors, and other components.
  3. Medical Devices:
    • Assembling medical devices, such as disposable syringes, IV components, blood filters, and other plastic parts used in healthcare applications.
  4. Packaging:
    • Sealing and welding plastic packaging materials, such as blister packs, clamshells, and other types of packaging used in the food, pharmaceutical, and consumer goods industries.
  5. Consumer Goods:
    • Joining plastic components in the production of household appliances, toys, and other consumer products.
  6. Textile Industry:
    • Welding and sealing synthetic fabrics and textiles in the production of clothing, bags, and other textile products.
  7. Aerospace:
    • Assembling plastic components in the aerospace industry, where lightweight and durable materials are crucial.
  8. Electrical Components:
    • Joining plastic parts in the production of electrical components, such as connectors, switches, and housings.
  9. Toys and Games:
    • Assembling plastic parts in the manufacturing of toys, games, and recreational products.
  10. Appliances:
    • Joining plastic components in the production of appliances such as washing machines, refrigerators, and vacuum cleaners.
  11. Filters and Seals:
    • Welding plastic filters and seals are used in various industries, including automotive, HVAC, and industrial applications.
  12. Footwear Industry:
    • Welding and bonding plastic components in the production of shoes and other footwear.
  13. Renewable Energy:
    • Assembling plastic components in the manufacturing of renewable energy products, such as solar panels and wind turbine components.
  14. Custom Packaging Solutions:
    • Creating custom packaging solutions for unique product requirements, providing secure and tamper-evident seals.
  15. Stationery:
    • Joining plastic components in the production of stationery items, such as pens, folders, and other office supplies.
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