JP7429129B2 - Carrier tape lid - Google Patents

Description

The present invention relates to a carrier tape used for storing and transporting parts such as various electronic parts and precision instruments, and particularly relates to the structure of a sealing part of a lid body that covers parts stored in an embossed part.

Conventionally, as this type of carrier tape, for example, an embossed carrier tape described in Patent Document 1 has been known. In this device, electronic components are housed in a number of recesses (embossed parts) that are formed intermittently in the longitudinal direction, and a cover tape is heat-sealed to cover them. do. The carrier tape containing components and the like in this manner can be wound onto a reel and stored or transported.

For example, when mounting an electronic component on a board, etc., the reel is attached to a mounting machine (mounter), the carrier tape is fed out, the cover tape is peeled off, and the component is taken out from the embossed part where it has been peeled off. When taking out the parts in this way, it is preferable to be able to peel off the cover tape smoothly without requiring much force, but a required peel strength is also required to prevent the cover tape from peeling off during transportation.

Conventionally, acrylic and polystyrene resins are commonly used as the adhesive layer of such cover tapes, and the adhesive strength varies depending on the temperature, pressure, time, etc. during heat fusion, so the required peel strength The process is controlled to ensure that. In particular, the temperature at the time of thermal fusion (hereinafter also referred to as sealing temperature) has a large effect on peel strength, and generally, as shown in Figure 2, the higher the sealing temperature, the lower the peel strength. It gets expensive.

Japanese Patent Application Publication No. 7-223674

Therefore, in the past, the seal temperature was managed in consideration of the correlation with the peel strength mentioned above, and was set at a low temperature so that very strong force was not required when peeling. This results in large variations in adhesive strength. As a result, as indicated by the symbol R in FIG. 2, the lower the sealing temperature, the greater the variation in the maximum and minimum peel strength.

If this happens, as mentioned above, for example, when mounting electronic components, the adhesive force changes greatly while pulling out the carrier tape from the reel and peeling off the cover tape, resulting in increased vibration (zippering) of the carrier tape. This may cause problems such as electronic components popping out from the embossed parts.

The present invention has been made in view of the above-mentioned problems, and its purpose is to improve the shape of the sealing part of the cover body (cover tape) in the carrier tape, so that it does not require much strong force and can be covered smoothly. The purpose is to make the tape removable.

(1) One aspect of the present invention is a lid body that is attached to a carrier tape in which a plurality of recesses are intermittently arranged in the longitudinal direction to close the openings of each of the plurality of recesses. , sealing portions between the carrier tape and the lid body are provided on both sides of the tape width direction with the plurality of recesses in between, and each of the sealing portions has a sealing portion extending in the tape longitudinal direction. A plurality of adhesive regions and non-adhesive regions extending at an angle are alternately formed so that the ratio of the length of the adhesive region in the tape width direction is approximately constant regardless of the position in the longitudinal direction of the tape. It is.
(2) In the aspect of (1) above, the adjoining adhesive regions in the seal portion may be formed parallel to each other.
(3) In the aspect of (2) above, an inclination angle of the plurality of adhesive regions in the seal portion with respect to the longitudinal direction of the tape may be set to be smaller than 60°.
(4) In the above aspects (2) and (3), the dimensions in the tape width direction of the plurality of adhesive regions in the seal portion may be the same.
(5) In any one of the above aspects (1) to (4), a length ratio of the adhesion region in the seal portion may be 18 to 95%.
(6) In any one of the aspects (1) to (5) above, the lid body is a cover tape extending in the longitudinal direction of the carrier tape, and the adhesive layer thickness of the seal portion is 0.5 to 10. It may be 0 μm.
(7) In any of the aspects (1) to (6) above, the lid is a cover tape extending in the longitudinal direction of the carrier tape, and an intermediate layer is provided on the entire one surface of the base layer. An adhesive layer is formed therebetween, and an antistatic layer is formed on the other side of the base layer, and the total thickness of the cover tape including the antistatic layer, base layer, intermediate layer, and adhesive layer is 35 mm. It may be ~60 μm.

According to the lid of the carrier tape according to the present invention, for example, by forming the adhesive area in the seal portion of the cover tape into a diagonal stripe pattern, the adhesive area is smaller than when the entire surface is the adhesive area. The sealing temperature can be set higher, and variations in adhesive strength (peel strength) can be reduced. This allows the cover tape to be peeled off smoothly without requiring too much force, suppressing zippering and preventing problems such as parts popping out.

1 is a perspective view showing a schematic structure of a taping body according to an embodiment of the present invention, (a) a partially cross-sectional perspective view, and (b) and (c) a cross-sectional view showing a structure of a seal portion. It is a graph figure showing an example of sealing temperature dependence of peel strength of a cover tape. FIG. 4 is an explanatory diagram showing the form of (a) an adhesive layer of a cover tape and (b) a seal portion. FIG. 4 is an explanatory diagram illustrating known patterns in the seal portion, in which (a) shows a stripe, (b) shows a cross, and (c) and (d) show a sea-island pattern, respectively.

Embodiments of the present invention will be described in detail below with reference to the drawings. In the embodiments of this specification, the same members are given the same reference numerals throughout.

FIG. 1(a) is a perspective view showing a taping body 1 according to an embodiment of the present invention.
This taping body 1 can be used, for example, to store and transport a large number of electronic components, etc., by winding them up on a reel, or by attaching them to a mounting machine (mounter) and sending them out to supply electronic components, etc. It is something that can be used. The taping body 1 is used not only for electronic parts but also for storing, transporting, supplying, etc. precision parts.

As shown in FIG. 1(a), the taping body 1 includes a long carrier tape 20 and a cover tape 30 (lid body) each extending in the tape transport direction. The carrier tape 20 has a plurality of recesses 21 arranged along its longitudinal direction (tape longitudinal direction) at predetermined intervals, that is, intermittently, for accommodating the parts P (shown only in FIG. 1(b)). It is formed. The shape of this recess 21 is set according to the size and shape of the component to be stored, but in the illustrated example, it is approximately rectangular in plan view.

In addition, on one side of the carrier tape 20 in the width direction (tape width direction) (the sprocket hole side located on the back side in FIG. 1), there are spout holes 22 for feeding the taping body 1 at predetermined intervals, that is, intermittently. Multiple lines are formed in parallel. The dimensions, shape, and spacing of the feed holes 22 are set according to the feed mechanism of the mounting machine, etc. In the illustrated example, the feed holes 22 having a circular cross section are spaced approximately half the distance between the recesses 21. It is formed.

As an example, the carrier tape 20 is made of thermoplastic resin. Thermoplastic resins include, for example, synthetic resins such as polycarbonate, polystyrene, polyvinyl chloride, polyethylene terephthalate, and polypropylene, those resins that have been kneaded with carbon etc. to give them conductivity, and those that have conductive coatings applied to their surfaces. can be mentioned.

A cover tape 30 is attached so as to close the openings of each of the plurality of recesses 21 of such a carrier tape 20. As shown in FIG. 1(b), in this embodiment, the cover tape 30 is not formed with a feed hole, and the width of the cover tape 30 is adjusted so as not to block the feed hole 22 of the carrier tape 20. It is narrower than 20. Note that the width of the cover tape 30 may be made to be approximately the same as that of the carrier tape 20, and a feed hole having the same size and shape may be formed at a position corresponding to the feed hole 22.

For example, the cover tape 30 has a base layer made by laminating films such as polyester and polyethylene terephthalate, and a conductive coating is applied to the surface thereof, while an intermediate layer such as polyethylene or polyamide and an adhesive layer of acrylic resin are formed on the back side. The layers are formed in this order. Polyester, polystyrene resin, vinyl acetate resin, etc. are also used for the adhesive layer, and conductive substances such as metal oxides and organic conductive polymers are sometimes mixed in to impart conductivity.

The thickness of each of these layers is preferably about 1 μm for the antistatic layer, about 12 to 16 μm for the base layer, about 30 to 40 μm for the intermediate layer, and about 0.5 to 10.0 μm for the adhesive layer, and the cover tape 30 is a combination of these layers. The total thickness is preferably about 35 to 60 μm to ensure the required strength. In particular, with respect to the adhesive layer, if it is less than 0.5 μm, sufficient adhesive strength cannot be obtained, while if it exceeds 10 μm, the risk of blocking increases.

Then, the cover tape 30 is superimposed on the carrier tape 20 with the components stored in the recess 21, and predetermined parts on both sides of the tape in the width direction with the recess 21 in between are heated with a soldering iron, so that the tape is continuous in the longitudinal direction. Two heat-sealed seal portions 40 are thus formed. In the illustrated example, the seal portion 40 is formed between the recess 21 and the spout hole 22 on one side in the tape width direction, and is formed along the side edges of the carrier tape 20 and the cover tape 30 on the other side. There is.

When the reel of the taping body 1 containing the components is attached to a mounting machine and the cover tape 30 is peeled off while being fed out, the seal portion 40 is peeled off sequentially from one end in the tape longitudinal direction. At this time, it is preferable that the cover tape 30 be peeled off smoothly without requiring much force, but sufficient peel strength is also required so that the cover tape 30 does not peel off during transportation.

Generally, the peel strength of an adhesive layer made of acrylic resin varies depending on the temperature, pressure, time, etc. during heat-sealing, but in particular, the peel strength of the adhesive layer made of acrylic resin changes depending on the temperature during heat-sealing (hereinafter also referred to as sealing temperature). It has a strong influence. As an example, as shown in Fig. 2, the higher the sealing temperature, the higher the peel strength. The peel strength (average value) is as high as 0.93N.

The graph shown in FIG. 2 is obtained by a test using the taping body 1 of this embodiment, as described in detail below.As an example, the width of the carrier tape 20 is 8.0 mm, and the width of the cover tape is The width of the seal portion 30 is 5.5 mm, and the width of the seal portion 40 is 0.5 mm on each side. Further, the pressure during thermal fusion was 1.2 MPa, the time was 0.1 seconds, and the peel strength was measured as the force (N) required per unit area.

In consideration of the dependence of the peel strength on the sealing temperature as described above, it is necessary to set the peel strength to be low so that a very strong force is not required when peeling off the cover tape 30, and it is necessary to lower the sealing temperature. Therefore, variations in adhesive strength depending on the portion within the seal portion 40 become large. This is thought to be due to the fact that there are microscopically strongly bonded portions and non-strongly bonded portions within the seal portion 40, and the variation in the bonding increases when the sealing temperature is low.

Therefore, as shown in FIG. 2 showing the minimum and maximum ranges of peel strength as R, the variation in peel strength increases when the sealing temperature is low. In this case, as described above, for example, when the cover tape 30 is peeled off when feeding components in a mounting machine, the peeling strength changes greatly, and the vibration (zippering) of the taping body 1 increases, causing the concave portion to Problems such as parts flying out from the 21 may occur.

Therefore, in this embodiment, by setting the sealing temperature to a high value, the adhesive layer is formed diagonally so as to reduce the variation in adhesive strength depending on the part within the sealing part 40 and to prevent the peel strength from becoming too high. It is composed of a striped pattern. That is, as an example shown in FIG. 3(a), the adhesive layer formed on the entire back surface of the cover tape 30 is formed in a stripe shape that is inclined with respect to the longitudinal direction of the tape.

(Form of seal part)
Hereinafter, the form of the seal portion of this embodiment will be explained in detail. First, as shown in FIG. The width, ie the trowel width, is each 0.5 mm. As shown in an enlarged view in FIG. 3(b), a plurality of adhesive regions 41 and non-adhesive regions 42 are alternately formed, each extending at an angle of, for example, about 30 degrees with respect to the longitudinal direction of the tape.

In the illustrated example, the adhesive area 41 and the non-adhesive area 42 each have a constant width and are formed in parallel, so that the length of the adhesive area 41 in the tape width direction is independent of the position in the tape longitudinal direction. The proportion of is constant. For convenience of explanation, auxiliary lines A extending in the longitudinal direction of the tape are shown at intervals of 100 μm in FIG. 3B, and the features of the diagonal stripe pattern appear in the square region B in the lower left corner of the figure.

That is, on the upper side of the square area B, the width of the adhesive area 41 located on the left side of the figure is 50%, while on the lower side of the square area B, the width of the adhesive area 41 located on the right side of the figure. The width is 50%. Then, as one moves downward from the upper side, the width of the adhesive area 41 on the left side becomes narrower at a constant rate, and the width of the adhesive area 41 on the right side increases at the same rate.

That is, according to the diagonal stripe pattern of the seal portion 40 of this embodiment, the adhesive area 41 and the non-adhesive area 42 have the same width, and the length of the adhesive area 41 in the tape width direction is independent of the position in the tape longitudinal direction. The ratio of the area (corresponding to the ratio of the adhesive area, hence also referred to as the adhesive area ratio hereinafter) is constant at 50%. Therefore, the actual bonding area of the seal portion 40 is half of the apparent (when the entire surface is the bonding area), and the bonding force is reduced accordingly.

Then, in this embodiment, the sealing temperature of the seal portion 40 is set higher to reduce the variation in the adhesive force depending on the region, since the adhesive area becomes smaller and the adhesive force becomes smaller. Although details will be described later, in the example shown in FIG. 2, by setting the sealing temperature to, for example, 150° C. or higher, variations in adhesive strength are sufficiently reduced, and the peeling strength when peeling off the cover tape 30 when supplying parts, etc. changes can be suppressed.

Here, the pattern of the seal portion 40 does not necessarily need to be inclined at 30 degrees with respect to the longitudinal direction of the tape. However, if a non-slanted stripe pattern is used as shown in Figure 4(a), if the part to be heated and fused with a soldering iron shifts in the tape width direction, the adhesion area ratio will change and the adhesive strength will decrease. Therefore, it is tilted by at least 1 degree, preferably 5 degrees or more, and more preferably 10 degrees or more.

Furthermore, although not shown, if the inclination angle were to be 90°, a non-adhesive region 42 would be formed over the entire width of the tape, and the adhesive force would rapidly decrease here, so the inclination angle should be less than 90°. should be. This inclination angle can be set geometrically according to the widths of the adhesive region 41 and the non-adhesive region 42 so that the non-adhesive region 42 is not formed over the entire tape width direction.

In reality, the inclination angle of the stripe pattern should be smaller than 89°, taking into account that the stripe pattern of the adhesive layer is formed by printing. Furthermore, when peeling off the cover tape 30 while feeding out the taping body 1, force may be applied diagonally to the longitudinal direction of the tape. It is more preferable to make it smaller than °.

As for the pattern of the seal portion 40, as shown in FIG. 4B, an example is obtained by reversing the direction of inclination of the diagonal stripe pattern of this embodiment to form a symmetrical diagonal stripe pattern, and overlapping these. A cross pattern may also be considered. However, in such a cross pattern, the peel strength itself changes greatly from α-α (50%) to β-β (100%), and the peel strength is not constant, which is not preferable.

Furthermore, as shown in FIG. 4C, for example, it is conceivable to make the adhesive area 41 dot-shaped, or conversely, make the non-adhesive area 42 dot-shaped, creating a so-called sea-island pattern. In the example (c), an area C where no adhesive area 41 exists is created in the longitudinal direction of the tape, and the adhesive force changes suddenly, which is not preferable. In the example shown in FIG. 4(d), the adhesive force similarly suddenly changes in the longitudinal direction of the tape, which is not preferable.

(Example)
Next, the results of a test conducted using the taping body 1 of the embodiment described above will be explained.
Table 1 below shows the taping body 1 of the embodiment described above, with various changes in the adhesion area ratio (ratio of the length of the adhesion area 41 in the tape width direction) in the seal portion 40 of the diagonal stripe pattern, and These are the results of examining changes in peel strength and its variation by changing the sealing temperature during thermal fusion.

In addition, in the taping body 1 subjected to the test, the total thickness of the cover tape was about 52 μm, of which the thickness of the adhesive layer (that is, the thickness of the adhesive area in the seal portion) was about 5 μm. Further, in Table 1, the strength when the adhesive area ratio is 100% indicates the peel strength when the entire surface is the adhesive area. In this case, in Comparative Example 1 in Table 1, the adhesion area ratio was 100% and the sealing temperature was 135°C, and the peel strength was suppressed to 0.3N, but the variation was 0.21N. It gets bigger.

On the other hand, in Example 3 of Table 1, the adhesion area ratio was set to 50% and the sealing temperature was set to 160°C, and the peel strength was a suitable value of 0.37N, and there was no variation. It is sufficiently small at 0.039. When the bonding area ratio is 100% at the same sealing temperature, the peel strength is 0.74 N, and it can be seen that in this embodiment, the peel strength can be set to about half.

From Example 3 to the bottom of the table, the sealing temperature is increased to 180 to 220°C in the order of Examples 4 to 10, while the adhesion area ratio is decreased in the range of 17 to 40%. In this case, the peel strength decreases approximately in proportion to the decrease in the adhesion area ratio, so that while the peel strength is ensured by setting the sealing temperature, the variation in the peel strength can be sufficiently reduced. In Example 10, which is the lowest example, the peel strength is 0.2 N, and this is considered to be the lower limit value.

On the other hand, in Examples 1 and 2 shown above the table above Example 3, the sealing temperature was set at 150°C, and the adhesion area ratio was set to be extremely large at 96% and 95%. As a result, the peel strength is as high as 0.6N. Due to the combination of the increased bonding area and the low sealing temperature, the variation in peel strength increased to nearly 0.1 N, which is considered to be the upper limit of the bonding area ratio.

In addition, in Comparative Example 2 shown above the table above Example 1, for comparison with the diagonal stripe pattern of the Example, a taping body having a cross pattern seal portion shown in FIG. 4(b) was used. It was manufactured and tested. As described above, in the cross pattern, the adhesive area ratio temporarily decreases at the intersection of the adhesive regions, and the adhesive force rapidly decreases, resulting in a large variation in peel strength of 0.390.

From the above test results, in the case of the taping body 1 of Examples 1 to 10 listed in Table 1, if the interval between the stripes of the sealing part 40 is changed to make the adhesion area ratio 18 to 95%, the sealing temperature can be lowered. The peel strength can be arbitrarily set within the range of about 0.2 to 0.6 N by adjustment. Further, by setting the adhesion area ratio and sealing temperature, variations in peel strength can be suppressed to less than 0.1N.

As described above, according to the taping body 1 of the present embodiment, the seal portion 40 of the cover tape 30 is formed in a diagonal stripe pattern, which reduces the actual bonding area compared to the case where the entire surface is used as the bonding area. Since this decreases, variations in peel strength can be reduced by setting the sealing temperature higher accordingly. For example, the sealing temperature may be set to about 150° C. or higher.

In addition, in the seal portion 40 of the diagonal stripe pattern, the length ratio of the adhesive area 41 in the tape width direction, that is, the adhesive area ratio is approximately constant regardless of the position in the tape longitudinal direction, so that the adhesive strength in the tape longitudinal direction is In other words, variations in peel strength can also be suppressed.

Therefore, as mentioned above, by setting the adhesion area ratio within a predetermined range (18 to 95%, more preferably 30 to 50%), it is possible to ensure strength that will not peel off during transportation, while also ensuring that the parts are not peeled off during transportation. The cover tape 30 can be peeled off smoothly without requiring much strong force when peeling off, and moreover, with a generally constant force. This can suppress zippering and prevent problems such as parts popping out.

In addition, in the taping body 1 of this embodiment, the thickness of the adhesive layer forming the above-described pattern is 0.5 to 10.0 μm, so that sufficient adhesive strength can be obtained and the occurrence of blocking can be suppressed. . Furthermore, by setting the total thickness of the cover tape 30 to 35 μm or more, the necessary strength can be ensured, and by setting the total thickness to 60 μm or less, sufficient thermal conductivity can be obtained when the seal portion 40 is thermally fused. .

Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and variations can be made within the scope of the gist of the present invention as described in the claims. Changes are possible.

For example, in the embodiment described above, in the diagonal stripe pattern of the adhesive layer of the cover tape 30, the adjacent adhesive areas 41 are formed parallel to each other, and the dimensions of the adhesive areas 41 in the tape width direction are approximately the same. However, the present invention is not limited to this, and any pattern may be used as long as the ratio of the length of the adhesive region 41 in the tape width direction in the seal portion 40 is substantially constant regardless of the position in the tape longitudinal direction.

However, if the inclination angles of the plurality of adhesive regions 41 with respect to the tape longitudinal direction are made different, or the dimensions of the tape width direction are made different, for example, when forming a pattern by printing, or by heating the sealing part 40 with a soldering iron, Since there is a risk that the adhesion area ratio may change due to positional deviations or errors associated with actual manufacturing during fusion bonding, it is preferable to use a uniform diagonal pattern as in the embodiment described above.

Further, in the taping body 1 of the embodiment described above, the seal portion 40 is formed along the side edge of the long cover tape 30, but the seal portion 40 is formed at a slight interval from the side edge. may be formed. Furthermore, like the carrier tape 20, the cover tape 30 is not limited to a long cover tape. For example, a belt-shaped lid body obtained by dividing the long cover tape 30 into a plurality of pieces in the longitudinal direction may be attached to the carrier tape 20. You may also do so.

1 taping body 20 carrier tape, 21 recess, 22 spout hole 30 cover tape (lid body)
40 Seal part, 41 Adhesive area, 42 Non-adhesive area

Claims (7)

A lid body that is attached to a carrier tape in which a plurality of recesses are intermittently arranged in the longitudinal direction to close the openings of each of the plurality of recesses,
Sealing portions between the carrier tape and the lid are provided on both sides of the tape widthwise with the plurality of recesses in between, each extending in the tape longitudinal direction;
A plurality of adhesive regions and non-adhesive regions each extending obliquely with respect to the tape longitudinal direction are alternately formed in the seal portion, and the ratio of the length of the adhesive region in the tape width direction depends on the position in the tape longitudinal direction. is configured so that it remains approximately constant ,
A carrier tape lid body characterized by: Adjacent adhesion regions in the seal portion are formed parallel to each other;
The carrier tape lid body according to claim 1, characterized in that: In the sealing portion, an inclination angle of the plurality of adhesive regions with respect to the longitudinal direction of the tape is set to be smaller than 60°.
The carrier tape lid body according to claim 2, characterized in that: In the seal portion, the dimensions of the plurality of adhesive regions in the tape width direction are the same;
The carrier tape lid according to claim 2 or 3, characterized in that: The ratio of the length of the adhesive area in the seal portion is 18 to 95%,
The carrier tape lid according to any one of claims 1 to 4. A cover tape as a lid extending in the longitudinal direction of the carrier tape,
The adhesive layer thickness of the seal portion is 0.5 to 10.0 μm,
The carrier tape lid according to any one of claims 1 to 5. The cover tape is a cover tape extending in the longitudinal direction of the carrier tape, and an adhesive layer is formed on the entire surface of one surface of the base material layer with an intermediate layer interposed therebetween, and the other surface of the base material layer is electrically charged. A prevention layer is formed,
The total thickness of the cover tape including the antistatic layer, base layer, intermediate layer and adhesive layer is 35 to 60 μm.
The carrier tape lid according to any one of claims 1 to 6.