Ultrasonic Bonding Medical Instruments

Ultrasonic bonding medical instruments' ultrasonic system achieves digital ultrasonic generator control in precision, by which machine realized parameter visualization and digital input, ultrasonic amplitude adjustment, multiple operation modes, current ultrasonic frequency auto searching and tuning, phased ultrasonic amplitude operation mode, horn impedance checking and threshold control, etc. When using the ultrasonic welding plastic products, you do not add any adhesives, fillers or solvents, and do not consume a lot of heat sources. It has the advantages of simple operation, fast welding speed, high welding strength, high production efficiency and so on.

Product Parameter

FAQ：

In order to weld a product well, a variety of conditions must be met to weld a qualified product.

In production, what causes the poor ultrasonic welding effect?

Design of ultrasonic contact surface of the product: The effect of ultrasonic welding depends largely on whether the design of ultrasonic welding surface is successful and how to design the ultrasonic welding interface of the product?

1>Professional design of welding surface structure can concentrate ultrasonic energy during plastic welding, shorten welding time and improve welding quality. In order to design a good welding surface, the design of the energy guide (that is, welding wire) is particularly critical.

There are four types of ultrasonic contact surface design:

a: Ultrasonic butt joint structure: This is the most commonly used and simplest welding surface structure so far.

b: Ultrasonic U-shaped structure: U-shaped structure is mostly used for self-locking structural connection of weldments, and can prevent overflow at internal and external welds.

c: Ultrasonic ladder structure: ladder structure is mostly used for welding cosmetic containers, which has a good effect on the appearance of containers. In this structure, the energy guide must be on the inner side of the container.

d: Shear welding surface structure: when the container composed of plastic parts needs to achieve a better sealing effect, this welding design should be adopted. The shear connection design is adopted. First, the small and initial contact areas are melted to complete the welding. Then, when the parts are embedded together, they continue to melt along their vertical walls with controlled contact surfaces. In this way, a strong structure or a good sealing effect can be obtained, because the melting area of the interface will not let the surrounding air in.

2>Design of ultrasonic waveguide fuse line: When we want to achieve the function of water and air tightness, positioning and ultrasonic waveguide fuse line are the key to success or failure. Therefore, consideration in product design, such as positioning, material, and flesh thickness, which is absolutely related to the corresponding proportion of ultrasonic waveguide fuse line.

In general water and gas tight requirements, the height of the fuse wire should be within the range of 0.5~0.8m/m (depending on the meat thickness of the product). If it is less than 0.5m/m, the water and gas tight function should be achieved. Unless the positioning setting is very standard and the meat thickness is more than 5 m/m, the effect is not good.

Generally, the positioning and ultrasonic waveguide fuse lines of products requiring water tightness are as follows:

a. Bevel cut type: suitable for water tightness and welding of large products. The contact angle=45 °, x=W/2, d=0.3~0.8mm is preferred.

b. Stepped tip type: suitable for water tightness and the method of preventing bulge or crack. The angle of contact surface=45 °, x=w/2, d=0.3-0.8mm is preferred.

c. Peak valley tip type: suitable for high-strength welding of water tightness, d=0.3~0.6mm, the height h of the inner contact surface varies according to the shape, but h is about 1~2mm.

In addition to the factors such as ultrasonic waveguide fuse, fixture positioning, and product positioning, the conditions for ultrasonic setting are also a major factor.

Here we further discuss another reason (welding conditions) that causes water tightness. When we implement ultrasonic welding, the most basic goal is to seek efficiency and speed, but we often neglect the essentials of seeking efficiency. There are two normal phenomena:

a: The falling speed and buffering speed are too fast: this formation speed makes the dynamic pressure plus the gravity acceleration flatten the ultrasonic waveguide fuse line, making the fuse line unable to play the role of conduction, forming a pseudo phase fusion.

b: Too long welding time: plastic products receive too long heat energy, which not only melts the plastic material, but also causes the plastic tissue to coke, resulting in sand holes, from which water or gas seeps out. This is the most difficult point for ordinary production technicians to find.

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