JPS6082328A - Ultrasonic melding method of plastics - Google Patents

Abstract

PURPOSE:To enable the welding of plastics with a high accuracy and a high quality by applying an ultrasonic vibration and a static pressure to plastics to be welded from both sides of the back at the lap thereof. CONSTITUTION:Horns 6 and 6' are brought into contact with the back opposite to the lapped side of plastics 1-1 and 1-2 to be welded and are connected to ultrasonic vibrators 8 and 8' through booster horns 7 and 7' to be fed with an ultrasonic energy from ultrasonic wave oscillators 9 and 9'. On the other hand, an air cylinder 15 pivoted a pin 18 on a stationary plate 17 fixed on a base 4 is driven to apply a static pressure to plastic 1-1 and 1-2. This causes the plastics to impacts each other at the lapped side thereof to ensure a positive consumption of energy at the lapped side thereby accomplishing welding.

Description

DETAILED DESCRIPTION OF THE INVENTION Kinoe and Akira are concerned with the ultrasonic welding force method for plastics.

The conventional ultrasonic welding method, as in Tsutsuchi, was to apply ultrasonic vibration energy and static pressure to the stacked WIK from one edge of the stacked WIK. If we look at the details more closely, we can see that most of the overlapping bath kimonos are worn in one set, that is, in many cases, two pieces, and they are loose, thin, and loose.
In the case of notebook-shaped yukata, three or more yukata have been used.

However, the welding means is the piece 11+ of the garment to be bathed.
111d was pressed against the base 7, and ultrasonic imaging energy was supplied from the counterpart 111i to bathe the overlapping surfaces. In the case of a thin sorted bath kimono, since the object to be welded is thin, it is necessary to use an ultrasonic energy supply method, for example, to make the bath kimono into a knurling shape. However, there were some difficulties with the finished shape.

Recently, the application fields of plastic welding have expanded by 1111.
Moreover, high precision and tube quality are required, and from this point of view, conventional methods are not satisfactory. The reason for this is due to the method of supplying ultrasonic vibration energy only on one side.
Unfortunately, the behavior of the welded material on the opposite side to the supply side is unstable. In other words, when it is the same, the bathed green object vibrates in phase IIη, or when it is the same, the ultrasonic wave is supplied 0111 and vibrates, and the other side is Ii'z+, or in the case of the same bathing kimono. However, there was some variation. There was also a tendency for interpolation when there was a thin sheet-like initial offset surface. There were also some difficulties with the finished shape.

The present invention has discovered that high-precision, high-quality plastic bathwear can be made by applying ultrasonic vibration and static pressure from both sides of the back side of the surface where the plastics to be made are overlapped. The present invention and (2) are also proposed.

The present invention will be explained in detail with reference to FIG. 1. The two glass plates /-/, /-2 that are to be completely welded are fitted together as a support plate! Place it on. A screw rod 3 is fixed to this support plate, and the screw rod 3 is screwed onto the support tube S fixed on the base plate so that it can be moved up and down. Also, both plus and tick/=/
, /-2 are placed on the back side opposite to the matched surfaces of E-J and E-J, respectively. Both horns A and O' are connected to ultrasonic transducers via star horns 7.7'% respectively.

Both booster horns 7.K' are connected to the respective ultrasonic oscillators 7', and ultrasonic energy is supplied by the respective ultrasonic oscillators 7'.
At 7', a protruding flange 10 is provided on the outer periphery of the vibration node.

Some booster horns 7' are fixed to the upper surface of one end of the base, and +1fi (7, flange 10f: fixed to the support plate λ side of the fixing plate //) is inserted into the insertion hole /2 provided in the fixing plate //. 7. The other booster hoe 77 has a cylindrical shape (7 is the supporting member/3
The flange 10 is brought into contact with a support part/g provided on the open side of the flange, a faucet-shaped fixing plate/g is applied from the outside, and fixed by screws (not shown). Then, the air/cylinder/ri rod/O is fixed to the anti-opening 9I11 of this support member/3, and the air cylinder/left is pivoted to the fixing plate/7 fixed on the base plate with a pin/f. , Air/Linda/S
The horn Z is driven by plastic /-/, /-1g
, ll, static pressure is applied to the plastic /-/, /-2, and ultrasonic vibration is applied to bathe it.

The present invention is constructed as described above, and both plastics /-/, /-2 to be welded are positively supplied with ultrasonic vibration energy from both sides and are also subjected to static pressure. Once L7 is reached, a phenomenon occurs in the overlapping surfaces of the plastics where they try to collide with each other, and that energy is definitely consumed by the overlapping surfaces, resulting in a mess. What is important here is that when the ultrasonic frequencies on both sides are the same, the phase of the vibration must be in-phase for efficient bathing. This is particularly effective when it comes to plastic dimensions. In other words, a correlation meter between the thickness direction dimension of the plastic to be welded and the ultrasonic frequency has an effect on the welding (7) and the groove. Therefore, it is better to use a high frequency for thin materials and a low frequency for thick materials. .

Figure 1 shows the case where there are three pieces of plastic, and in this case, the overlapping surfaces of plastic /-/ and /-) and
- The bathing is started at the same time on the three overlapping surfaces, and energy on both sides is not wasted.

In the case mentioned above, even if you do not pay attention to the shape of the tips of the horns, you can be sure that the three pieces of plastic /-
/,〆-,:1. /-3 welding can be performed. However, the finished shape can still be made more beautiful. In the present invention, welding can be performed reliably as described above, and the limit can be reached in the case of high-quality, high-precision welding and multiple welding surfaces. It is possible to improve the

[Brief explanation of drawings]

The figures show an embodiment of the ultrasonic welding method for plastics according to the present invention. Fig. 1 is a partially cutaway front view showing one example, and Fig. 2 is a sectional view showing the main parts of another example. It is. Note that /-/, /-2, and 7-3 in the figure are plastic. Patent applicant Shimada Rika Kogyo Co., Ltd.

Claims (1)

[Claims] An ultrasonic welding method for plastics θ characterized by applying ultrasonic vibration and static pressure from both sides of the back side of the overlapping surfaces of plastics to be welded.