JPH0695556B2 - Carrier tape and connection method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a carrier tape used for storing various mass-produced parts such as various electronic parts and precision equipment parts, and a connecting method thereof.

(Prior Art and Problems Thereof) The carrier tape used for storing these has, as shown in FIG. 1, for example, a large number of concave containers 2 for individually accommodating the fine parts 1 ... At the same time, on the front side of the strip 4 in which the small holes 3 for guiding are provided in a row on the side,
It is known that a flexible adhesive tape 5 that covers the opening edges of each of the concave containers 2 is pasted and then rolled into a roll shape, and a fine component is stored therein and Is taken out exclusively by mechanical and automatic means.

Each of the concave containers 2 is accommodated in the tape by using a carrier tape manufactured separately in advance or by using a carrier tape which is continuously molded by vacuum molding or the like from a plastic tape as a material. A method is adopted in which the fine edges 1 are individually and sequentially inserted into the ... And then the opening edge of each concave container 2 is covered with an adhesive tape. The process of manufacturing this carrier tape or accommodating the fine dimensions therein At times, carrier tapes are often cut, which affects yield and workability.

In such a case, conventionally, as shown in FIG. 4, the defective portion is deleted, and then both ends a and a are overlapped with each other.
(Fig.), Or both ends b, b butted together (the same b
(Fig.), A method of joining the respective contact surfaces c and d with an adhesive or the like has been adopted. However, this method does not have sufficient bonding strength in the flow direction, which causes a trouble of cutting again at this portion during use, and also the peeling operation of the adhesive tape at the time of taking out fine parts from the carrier tape. There is a problem in that there is a problem due to a step in the connection portion.

(Means for Solving Problems) The present invention is intended to provide a carrier tape and a connecting method thereof, which solves the above problems.
The gist of the present invention is that the carrier tape is such that the connecting portions of the tapes are connected to each other at the inclined surfaces in the flow direction, and the second invention is the end portions of the two tapes. Further, the present invention relates to a method for connecting carrier tapes, in which inclined surfaces having a shape that is vertically symmetrical with each other and having the same shape in the flow direction are formed, and both inclined surfaces are weld-bonded.

That is, the present inventors have made various studies on a more effective connection method when the carrier tape is cut, and as a result, when the connection parts of the tape are joined on the inclined surface in the flow direction,
Since the contact area between both tapes increases and the mechanical strength of the connecting part improves, which also results in flat connection with the same thickness as the original fabric, when peeling off the adhesive tape for coating. The present invention has been completed by finding that it does not hinder the work.

As shown in FIG. 2, the carrier tape according to the present invention is formed such that the respective end portions 7 and 7 form inclined surfaces 8 and 8 which are symmetrical to each other and have the same shape in the flow direction, and are joined at the contact surfaces. Note that the shape of this inclined surface may be a curved surface or a stepped shape, in addition to the flat shape shown in the drawing.

The first method for forming this inclined surface and the connection thereof is achieved by cutting each end portion by a mechanical method at an arbitrary angle symmetrical to each other and then connecting the cut surfaces with an adhesive or the like. To be done. At this time, the angle of inclination of the primary approach line of the connection surface with respect to the tape surface is 20 to
It is desirable to be within 70 °. This is because if the angle is less than 20 °, the connection surface becomes unnecessarily large and unpractical, and if the angle exceeds 70 °, the effect of maintaining the strength becomes extremely small. On the other hand, as another method, as shown in FIG. 3, the respective end portions 9 and 9 are overlapped with each other by a predetermined length, and the horn 10 of the ultrasonic vibrator is overlapped with this overlapping portion.
It is also possible to apply by ultrasonic welding. In this case, the ultrasonic welding condition is a pressure of 0.1
It is desirable to set the oscillation time to 50 kgf / cm ² and the oscillation time to 0.1 to 5 seconds at 28 kHz. When the applied pressure is less than 0.1 kgf / cm ² , not only the required adhesive strength is not obtained, but also the appearance is not smooth, and when it exceeds 50 kgf / cm ² , dimensional stability is not obtained. On the other hand, if the oscillation time is less than 0.1 seconds, the tape does not reach the desired temperature and the required adhesive strength cannot be obtained.
If it exceeds the second, the material of the tape itself begins to deteriorate, which also results in a decrease in strength. If burr is generated during welding, it is possible to treat the burr as necessary.

(Examples) Next, the details of the present invention will be described with reference to Examples. The folding endurance and the peeling strength of the adhesive tape in the Examples were measured by the following methods.

(Folding strength)

Fix one end of the carrier tape (without adhesive tape) of the sample, hang down the other end around a cylinder with a diameter of 30 mm so that the connecting part is on the cylinder, apply a load to that end, and gradually Folding strength was defined as the load when the number of joints was broken.

[Peel strength of adhesive tape]

The carrier tape, which was obtained by sealing the adhesive tape at 140 ° C for 0.5 seconds, was pulled by Tensilon at a pulling speed of 300 mm / min.
A 0 ° peel test was performed.

Example 1 A carrier tape made of polystyrene having a width of 8 mm, a thickness of 0.25 mm, and a pitch of concave containers of 4 mm was used, after the adhesive tape was removed, the tape was cut in place, and these two tapes were treated as shown in FIG. Positioned according to the pilot pins 12, 12 of the tool 11, each end of the cut two tapes has a length of 0.2 to 0.3 mm so that each end of the tape can be overlapped at an intermediate position between the two concave containers. Adjust the height, cut again, and fix on the jig 12. The width of the tip is 1.4m on the upper surface of the overlapping part.
Ultrasonic oscillator USWP-200 with m, length of 15 mm and flat surface
The horn 10 connected to Z28S (manufactured by Ultrasonic Industries Co., Ltd.) was pressed against it, ultrasonic waves were oscillated for 0.1 to several seconds, and the polymerized portions were welded and bonded by friction heat. In addition, the thickness of the connection part at this time is the horn
It was regulated by spacers (not shown) of this thickness provided on both sides of 10 (in the front-back direction in the figure). Burrs at the top and bottom of the connecting portion and in the guide pin holes that occurred during welding were removed by a punching press. Thus, a carrier tape having a connecting portion with a sectional shape as shown in FIG. 2 was obtained.

As a result of the bonding by ultrasonic welding, the cross section of the connecting portion formed an inclined surface in the flow direction, and both connecting tapes were connected with a larger contact area.

The folding strength and the adhesive tape of the carrier tape A obtained by the above method and the carrier tape B as shown in FIG. When the peel strength of was measured,
The following results were obtained.

From this, it was found that the peeling strength of the connection portion according to the present invention was not so different from the place where the peeling strength was not broken, and did not hinder the peeling operation of the adhesive tape.

Example 2 One end of two embossed carrier tapes is cut at an angle of 45 ° in the thickness direction, the other end is cut at 135 °, and both cut surfaces are two-component epoxy resin. (Toagosei Kagaku Kogyo Co., Ltd.) adhesively bonded at room temperature to form a shape as shown in FIG. 2, and the same carrier tape was cut at each end at right angles in the thickness direction, and both cut surfaces were butted. When the folding endurance was measured in the same manner as in the previous example for the ones having the shape as shown in FIG. 4 (b), which were joined in the same manner as above, they were respectively about 2.0 kgf and about 0.7 kgf, and the latter was practical. I couldn't stand it.

(Effects of the Invention) According to the present invention, the contact area between both tapes at the connecting portion of the tape is increased, the mechanical strength of the connecting portion is improved, and the work is hindered when the adhesive tape for coating is peeled off. There is no fear of coming.

[Brief description of drawings]

1 to 3 relate to the present invention. FIG. 1 is a perspective view showing an example of a carrier tape to which the present invention is applied, and FIG. 2 is an enlarged sectional view showing a state of a connecting portion of the carrier tape. FIG. 3 is an enlarged cross-sectional view showing an operation procedure at the time of connection, and FIGS. 4 (a) and 4 (b) are both enlarged cross-sectional views showing a connection portion obtained by a conventional connection method. (Explanation of Main Symbols) In the figure, 7 and 9 are end portions, and 8 is an inclined surface.

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Claims (4)

[Claims] 1. A carrier tape, characterized in that the connecting parts of the tapes are connected to each other at inclined surfaces in the flow direction. 2. A method of connecting carrier tapes, characterized in that inclined surfaces having the same shape in the flow direction are vertically symmetrical to each other and the inclined surfaces are connected to each other. 3. The method for connecting carrier tapes according to claim 2, wherein the inclined surface is formed by cutting by a mechanical method, and the bonding is performed by adhesion. 4. The method according to claim 2, wherein formation of the inclined surface and connection thereof are performed by ultrasonic welding.
A method of connecting a carrier tape according to the item.