JP3502608B2 - Cover tape winding products - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll-up product of a cover tape used as, for example, a cover material for a carrier tape for carrying electronic parts.

[0002]

2. Description of the Related Art A cover tape for sealing such as a carrier tape for carrying an electronic component of an extremely small size is provided as a product in a wound state. It is required that the product to be manufactured be long in order to improve work efficiency.

Conventionally, as a method of winding the cover tape,
Record winding is known in which cover tape is wound in the radial direction of the winding shaft, and other than that, traverse winding, etc., in which the cover tape is wound while traversing in the axial direction of the winding shaft, is proposed. Has been done.

[0004]

Among the above-mentioned winding methods, in the case of record winding, winding collapse easily occurs, and for example, the limit of the winding length of a cover tape having a thickness of about 55 μm is about 1000 m. It is difficult to deal with the request for scaling.

On the other hand, in the traverse winding, a cover tape having the same thickness can be wound up to 30000 m, and it is possible to sufficiently meet the demand for lengthening.

However, in the traverse winding,
Since the cover tape is wound while being moved in the width direction (axial direction of the winding shaft) and arranged in a spiral shape, it is very difficult to apply the winding tension evenly and uniformly over the entire tape area. When rewound, the cover tape may be deformed such as waviness and wrinkles, and the sealing property with respect to the carrier tape may be deteriorated. If the winding tension is set low, deformation such as waviness can be prevented, but winding will collapse due to insufficient tension, making it difficult to store, convey, etc. I was afraid.

The present invention solves the above-mentioned problems of the prior art, can sufficiently cope with the demand for lengthening, and can prevent collapse of the winding and prevent harmful deformation at the time of rewinding. The purpose is to provide rolled products.

[0008]

DISCLOSURE OF THE INVENTION The inventor of the present invention has made a detailed analysis of various constituent elements such as a winding tension, a pressing force and the like in addition to a winding form in a cover tape winding product, and has made diligent efforts. As a result, in addition to finding individual optimum conditions for each component, there is a correlation between the tape width, the winding tension, and the pressure suppression that have a great influence on the quality in addition to the individual optimum conditions. Got Based on this finding, the present inventor conducted repeated in-depth research, and as a result, found a relational expression embodying the above correlation, and based on the relational expression and optimum conditions of each component, The inventors have found the optimum achievable configuration and completed the present invention.

That is, according to the present invention, a cover tape having a width of 2.5 to 15 mm and having a sealing layer made of an olefin resin is applied to the winding shaft side in a state in which a load is applied in the pulling direction and is suppressed in the winding shaft direction. A cover tape take-up product which is wound while traversing in a horizontal direction, and the amount of movement in the axial direction per roll is set to be larger than the width of the cover tape. 0.5 to
While the gap of 1.5 mm is formed, the width of the cover tape is "W", the winding tension defined by the load in the tensile direction with respect to the tape width (W) is "T", and the cover tape is wound on the winding shaft side. The summary is that the following relational expressions (a) and (b) are established when the suppression (linear pressure) is "P".

W / 5.3 = (9.0 to 14.0) / T (B) P = 8.0 × T to 12.0 × T (B) Rolled product of the cover tape of the present invention In the above, since the traverse winding method is adopted, the length of the tape can be sufficiently increased, and the working efficiency can be improved.
Further, according to the type of the tape width and the like, since the tape is wound by applying the suppression force and the winding tension peculiar to the present invention, the tape can be wound in a stable state in a well-balanced manner, and while preventing the winding collapse, When rewound, harmful deformation such as waviness and wrinkles can be prevented, and good sealability and adhesiveness can be obtained.

The structure of the present invention will be described below in detail with reference to the drawings.

As shown in FIG. 1, the cover tape winding product (1) of the present invention is such that the cover tape (2) is wound around the winding shaft (3) of a bobbin or the like while traversing in the axial direction. It was done.

Here, as the cover tape (2) used in the present invention, a cover tape having a sealing layer made of an olefin resin is used, and for example, it is formed on a base material layer made of a polyvinyl chloride resin or a styrene resin. It is possible to suitably use a laminate in which the above-mentioned seal layers are integrated.

As the cover tape (2), one having a tensile strength of about 0.25 to 2.5 g / cm ² can be preferably used.

In the present invention, the cover tape (2) is
It is necessary to use one having a width of 2.5 to 15 mm, and it is preferable to use one having a lower limit value of 4 mm or more and an upper limit value of 10 mm or less. That is, when the tape width deviates from this range, the use as a cover tape decreases, which is not preferable. Especially when the tape width is too wide,
The tape (2) cannot be wound around the winding shaft (3) in a stable state with good balance over the entire width direction, which may cause collapse of the winding or harmful deformation when unwound, which is not preferable.

The cover tape (2) having a thickness of 30 to 70 μm can be preferably used.
More preferably, the lower limit is 40 μm or more and the upper limit is 60.
It is preferable to use one having a thickness of μm or less. That is, if the thickness is too thin, the strength, tension, etc. may be reduced, and defects such as breakage and extension may occur. On the contrary, if the thickness is made thicker than necessary, not only the effect commensurate with the thickness cannot be expected, but also the product may become large, which is not preferable.

In the present invention, when the cover tape (2) having the above structure is wound, as shown in FIG. 2, the axial movement amount (pitch) of the cover tape (2) for each winding is determined by The width is set larger than the tape width to form a gap (S) between adjacent cover tapes (2) for each winding. In the present invention, the gap (S) needs to be set to 0.5 to 1.5 mm, preferably 1 mm ± 10%, that is, the lower limit is 0.9 mm or more and the upper limit is 1. It is better to set it to 1 mm or less. If the gap (S) is too large, the winding density of the tape (2) is low, the feeling of bulkiness becomes too strong, and the winding length becomes short, which is not preferable. vice versa,
If the gap (S) is too small, the tapes (2) may overlap each other during one turn at the turn portion when traversing, and the tape (2) may be deformed due to the overlap, which is not preferable.

Further, as shown in FIG. 3, the winding pitch is
When the tape width is made smaller and the tapes adjacent to each other in one roll are partially overlapped to form the lap portion (L),
When so-called wrapping is performed, the wrap portion (L)
This may deform the tape (2), which is not preferable. Note that, in FIG. 3, the lap portion (L) is hatched to clarify the configuration.

In the present invention, the load is applied to the cover tape (2) in the pulling direction by the tension roller such as the dancer roller (11) and the load is applied to the winding shaft (3) side by the pressing roller (12). It is something that is rolled up in a state.

Here, in the present invention, as will be understood from the examples described later, the load (tensile load Lt) in the pulling direction by the dancer roller (11) on the cover tape (2) is set to 50 to 70 g. To be done. Further, the suppression load (Lp) on the winding tape (3) side of the cover tape (2)
Is 8.0 to 12.0 times the tensile load (Lt), preferably the lower limit is 9.0 times or more and the upper limit is 11.0 times or less, more preferably about 10 times. In particular,
The suppression load (Lp) is 400 to 840 g, preferably 4
It is preferable to set 50 g or more and 770 g or less, more preferably 500 g or more and 700 g or less.

In the present invention, the load (Lt) in the tension direction on the cover tape (2) is obtained by measuring the load applied to the dancer roller (11) with a platform scale.

In the present invention, the winding tension is the tensile load (Lt) with respect to the width (W) of the cover tape (2),
In other words, it is defined by Lt / W, and the suppression (linear pressure) is the suppression load (L) with respect to the tape width (W).
p), that is, Lp / W, the following relational expressions (a) and (b) need to be established when the winding tension is "T" and the suppression force is "P". .

W / 5.3 = (9.0 to 14.0) / T ... (A) P = 8.0 × T to 12.0 × T (B) First, the relational expression (A) is the tape Width (W) and winding tension (T)
The relationship is with, and roughly, the winding tension (T) is set to 1/2 when the tape width (W) is doubled.

That is, the present inventor, when traversing the cover tape (2) as described above,
Various conditions such as the optimum winding tension (T) for a specific tape width (W) were found from detailed experiments. For example, 5.3m
It was found that when winding the m-width cover tape (2), an optimum winding state can be obtained by setting the winding tension (T) to 9.0 to 14.0 g / mm. Further, repeated tests were conducted on a large number of tapes (2) having different widths, and it was found that the optimum winding tension at a tape width of 5.3 mm was 9.0 to 14.0 g / mm. Found that there was a correlation between the standard configuration and the other configuration tapes in terms of tape width and optimum winding tension. According to this, the tape width of the standard configuration is "Ws (= 5.3 mm)" and the optimum winding tension is "Ts (= 9.0 to 14.0 g / mm)",
Assuming that the width of the tape having the other configuration is “W” and the optimum winding tension of the tape having the width (W) is “T”, the tape width (W) of the other configuration with respect to the tape width (Ws) of the standard configuration Ratio (W / Ws) and the ratio (T / Ts) of the optimum winding tension (T) of the other structure to the optimum winding tension (Ts) of the standard structure.
Have been found to be in an inverse proportional relationship, and the relationship of W / Ws = Ts / T is established. Then, in this relational expression, the tape width (Ws) and the optimum winding tension (T
As a result of replacing s) with the above specific numerical values, the above relational expression (a) is derived.

In the present invention, if the winding tension is excessively low, problems such as collapse of the winding due to insufficient tension may occur, which is not preferable. On the other hand, when the winding tension is excessively high, excessive tension may cause harmful deformation such as waviness and wrinkles on the tape (2), which is not preferable.

Further, in relational expression (a) of the present invention, a point to be particularly emphasized is that the winding tension (T) is decreased when the tape width (W) is increased. . That is, it is a general idea from the past that when the tape width is increased, the winding tension is also increased by that amount. However, according to the research results of the present inventor, the tape width is increased. In this case, it becomes more difficult to uniformly apply tension to the entire width direction, so increasing the tension disrupts the tension balance in the width direction, causing harmful deformation such as waviness and wrinkles, and impairing the sealing performance. There is a risk that Therefore, as in the present invention, it is necessary to have the above relationship with respect to the tape width and the tension.

In the present invention, if the tension is lowered when the wide tape is wound, there is a concern that the winding may collapse due to insufficient tension, but such a problem does not occur. That is, when the tape width is large, the contact area during winding is large and the winding state is stable, so even if the tension is reduced compared to narrow tape, the adverse effect due to insufficient tension may occur. However, it is possible to reliably prevent problems such as roll collapse.

In the present invention, the above relational expression (b)
Shows the relationship between the winding tension (T) and the suppression force (P), and is obtained from the detailed experimental results by the present inventor. That is, the suppression pressure (P) needs to be set to the winding tension (T) × 10 ± 20%, preferably the winding tension (T) × 10 ± 10%, and more preferably the winding tension (T). It is better to set it to about x10. In other words, the suppression force (P) is 8.0 times to 1 times the winding tension (T).
It is preferable to set the lower limit to 2.0 times, preferably 9 times or more and the upper limit to 11 times or less.

Here, if the suppression force (P) is excessively low, it becomes difficult to wind the cover tape (2) with an appropriate tension, and there is a possibility that problems such as winding collapse due to insufficient tension may occur. Not preferable. On the contrary, when the suppression force (P) is excessively high, an unreasonable force may act on the tape (2) to cause harmful deformation or the like, which is not preferable.

By the way, the cover tape winding unit capable of producing the wound product of the present invention is provided with a large number of winding devices as shown in FIG. 1, and the sheet film as the tape material is cut into a large number. The strip-shaped sheet pieces that have been cut, that is, the cover tape (2) are guided to the respective winding devices and wound in the above-described configuration. In this case, since each winding device is provided with a dancer roller (11) for giving a winding tension, each tape can be finely adjusted with an optimum tension, and harmful deformation or the like can be more reliably performed. Therefore, it is possible to wind under more optimal conditions.

Further, in the winding device to which the present invention can be applied, by adopting the bobbin traverse method in which the bobbin (winding shaft) side is moved in the axial direction to traverse, the tape side to be introduced is traversed. Compared with the guide traverse method described above, since the introduction path of the tape (2) to the winding shaft (3) is constant, the tape (2) is less likely to be twisted or wrinkled, and is wound in a more stable state. Can be taken.

[0032]

EXAMPLES Examples related to the present invention and comparative examples in comparison therewith will be described below. (1) Examples and Comparative Examples for 5.3 mm Width Tape

[0033]

[Table 1]

<Example 1> As shown in Table 1 above, the width of the olefin composite film is 5.3 mm and the thickness is 50 to 50 mm.
A 55 μm cover tape was wound 1500 m by the bobbin traverse method shown in FIG. 1 to obtain a wound product.

In this case, as shown in Table 1 above, the traverse amount (pitch) per roll is "tape width + 1 mm", and the gap (S) between adjacent tapes per roll as shown in FIG. Was set to 1 mm. Furthermore, with the tension load by the dancer roller set to 50 g, the winding tension is 9.43 g /
It was set to mm. Further, the pressure suppression by the pressing roller was set to 10 times the winding tension.

<Example 2> As shown in Table 1 above, a wound product was prepared in the same manner as in Example 1 except that the tensile load was set to 60 g and the winding tension was set to 11.32 g / mm. Obtained.

<Example 3> As shown in Table 1 above, a wound product was prepared in the same manner as in Example 1 except that the tensile load was set to 70 g and the winding tension was set to 13.21 g / mm. Obtained.

<Comparative Example 1> As shown in Table 1 above, a wound product was prepared in the same manner as in Example 1 except that the tensile load was set to 45 g and the winding tension was set to 8.49 g / mm. Obtained.

Comparative Example 2 As shown in Table 1 above, a rolled product was prepared in the same manner as in Example 1 except that the tensile load was 80 g and the winding tension was 15.09 g / mm. Obtained.

<Evaluation 1> With respect to each of the above-mentioned wound products, the winding state, sealing property and peel strength were evaluated as follows. A. Rolled state For each rolled product, the one in which the cover tape was wound in a stable state was evaluated as “◯”, and the one in which the cover tape was collapsed was evaluated as “x”. B. Sealability B-1. Presence or absence of meandering Rewind the cover tape of each wound product by a predetermined amount, put the edge part (side edge part) of the tape along the test stand, and by the meandering deformation of the whole tape, 2.5 mm per 1 m length Those having a rise of more than 2.5 mm were evaluated as "x", and those having no rise of more than 2.5 mm (within 2.5 mm) were evaluated as "○". For the measurement of the amount of lifting, a 30 cm metal scale that can measure a minimum of 0.5 mm was used. B-2. Presence or absence of deformation Unwind the cover tape of each roll product by a specified amount and visually observe the edge part of the tape along the test stand. Those with waviness confirmed by pulling out the tape 3 m on the table, or wrinkles confirmed with the tape are marked as “x”, and those without floating deformation exceeding 3 mm,
Those in which undulations and wrinkles were not confirmed were evaluated as “◯”. C. Peelability (peel strength) The cover tape of each rolled product is rewound by a predetermined amount and fused to a carrier tape under the conditions of a temperature of 120 ° C, a time per 16 mm of 0.1 sec, and a pressure of 1.0 kg / cm ^2. And sealed. After that, cover tape with speed 300mm
/ Min, the peeling angle was 180 °, and the peeling strength at that time was measured. When the strength is 50 to 100 g / cm, the strength is "○" because it has an appropriate strength, and when the strength is less than 50 g / cm, there is a risk of peeling unintentionally. The product was evaluated as "x" because it was difficult to peel smoothly when used.

The results of these evaluations are also shown in Table 1 above.

As is clear from the table, good evaluation results were obtained in Examples 1 to 3 related to the present invention.
On the other hand, in Comparative Example 1 in which the winding tension was lower than the specified range, the winding collapse occurred. Further, in Comparative Example 2 in which the winding tension was higher than the specified range, the sealing property was inferior due to the meandering, and the peel strength was insufficient. (2) Examples and comparative examples regarding 9.5 mm width tape

[0043]

[Table 2]

<Example 4> As shown in Table 2 above, a width of 9.
A 5 mm cover tape was wound in the same manner as in Example 1 to obtain a wound product. At this time, except that the tension load was set to 50 g and the winding tension was set to 5.26 g / mm,
It carried out like Example 1 above.

<Example 5> As shown in Table 2 above, a wound product was prepared in the same manner as in Example 4 except that the tensile load was set to 60 g and the winding tension was set to 6.32 g / mm. Obtained.

Example 6 As shown in Table 2 above, a wound product was prepared in the same manner as in Example 4 except that the tensile load was 70 g and the winding tension was 7.37 g / mm. Obtained.

<Comparative Example 3> As shown in Table 2 above, a wound product was prepared in the same manner as in Example 4 except that the tensile load was set to 45 g and the winding tension was set to 4.74 g / mm. Obtained.

Comparative Example 4 As shown in Table 2 above, a rolled product was prepared in the same manner as in Example 4 except that the tensile load was 80 g and the winding tension was 8.42 g / mm. Obtained.

<Evaluation 2> With respect to each of the above-mentioned wound products, the wound state (A), the sealing property (B) and the peel strength (C) were evaluated in the same manner as above. The results are also shown in Table 2 above.

As is clear from the table, good evaluation results were obtained in Examples 4 to 6 related to the present invention.
On the other hand, in Comparative Example 3 in which the winding tension was lower than the specified range, the winding collapse occurred. Further, in Comparative Example 4 in which the winding tension was higher than the specified range, the sealing property was poor due to the deformation, and the peel strength was insufficient.

Here, the widths of Examples 4 to 6 are about twice as wide as those of Examples 1 to 3, while the winding tension is set to about 1/2. Is understood to be optimal. (3) Examples and comparative examples regarding 13.5 mm width tape

[0052]

[Table 3]

<Example 7> As shown in Table 3 above, width 1
Using a 3.5mm cover tape, a tensile load of 50g,
A wound product was obtained in the same manner as in Example 1 except that the winding tension was set to 3.70 g / mm.

<Example 8> As shown in Table 3 above, a wound product was obtained in the same manner as in Example 7 except that the tensile load was set to 60 g and the winding tension was set to 4.44 g / mm. .

<Example 9> As shown in Table 3 above, a wound product was obtained in the same manner as in Example 7 except that the tensile load was 70 g and the winding tension was 5.19 g / mm. .

<Comparative Example 5> As shown in Table 3 above, a wound product was obtained in the same manner as in Example 7 except that the tensile load was set to 45 g and the winding tension was set to 3.33 g / mm. .

<Comparative Example 6> As shown in Table 3 above, a wound product was obtained in the same manner as in Example 7 except that the tensile load was set to 80 g and the winding tension was set to 5.93 g / mm. .

<Evaluation 3> With respect to each of the above-mentioned wound products, the wound state (A), the sealing property (B) and the peel strength (C) were evaluated in the same manner as above. The results are also shown in Table 3 above.

As is clear from the table, the evaluation results of Examples 7 to 9 related to the present invention were good.
On the other hand, in Comparative Example 5 in which the winding tension was lower than the specified range, the winding collapse occurred. Further, in Comparative Example 6 in which the winding tension was higher than the specified range, the sealing property was inferior due to the meandering and the peel strength was insufficient.

The width of each of Examples 7 to 9 is about 2.5 times that of each of Examples 1 to 3, while the winding tension is about 1 / 2.5. It is understood that the optimum setting is. (4) Comparative example for wrapping

[0061]

[Table 4]

<Comparative Examples 7 to 9 and their evaluation> As shown in Table 4 above, the width of the olefin composite film is 9.5 m.
A cover tape having a thickness of m and a thickness of 50 to 55 μm was wound 1500 m by the bobbin traverse method as shown in FIG. 1 to obtain a wound product.

In this case, as shown in Table 4 above, the traverse amount (pitch) per roll is set to be 4 mm smaller than the tape width, and as shown in FIG. The lap portion (L) was formed. Further, the winding tension and the winding tension were set to Comparative Examples 7 to 9 in the same manner as in Examples 4 to 6 above.

When each wound product was evaluated in the same manner as described above, as shown in Table 4 above, the lap wound comparative examples 7 to 9 were inferior in sealing property due to deformation. I understand. (5) Comparative example regarding 21.5 mm width tape

[0065]

[Table 5]

<Comparative Examples 10 to 12 and their Evaluation> As shown in Table 5 above, a cover tape having a width of 21.5 mm was used, a tensile load was 50 g, 60 g, 70 g, and a winding tension was 2.33.
g / mm, 2.79 g / mm, 3.26 g / mm, except that otherwise the same as Example 1 above, Comparative Example 10
~ 12 rolls of product were obtained.

Further, the same evaluation as above was carried out for each wound product. As shown in Table 5 above, in Comparative Examples 10 to 12 in which the tape width was excessively large, the tensile load, the winding tension, etc. Even if the conditions are appropriate, it can be seen that problems such as collapse of the winding and deformation have occurred.

[0068]

As described above, according to the cover tape winding product of the present invention, since the traverse winding system is adopted, the length of the tape can be sufficiently lengthened and the working efficiency is improved. Can be made. Furthermore, according to the type of tape width, etc., the tape is wound with a specific pressure and winding tension applied, so the tape can be wound in a stable state in a well-balanced manner, preventing collapse and rewinding. In this case, harmful effects such as waviness and wrinkles can be prevented and high quality can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a tape winding device capable of manufacturing a cover tape winding product according to the present invention.

FIG. 2 is a side view schematically showing a wound product of a cover tape as an example of the present invention.

FIG. 3 is a side view schematically showing a wound product of a cover tape as a comparative example for comparison with the present invention.

[Explanation of symbols]

1… Rolled product 2… Cover tape 3 ... reel S ... gap

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Claims (2)

(57) [Claims] 1. A cover tape having a width of 2.5 to 15 mm having an olefin resin sealing layer is traversed axially to a winding shaft in a state in which a load is applied in the tensile direction and the load is suppressed on the winding shaft side. A wound product of a cover tape that is wound up, in which the amount of movement in the axial direction per winding is set to be larger than the width of the cover tape, and a value of 0. While a gap of 5 to 1.5 mm is formed, the width of the cover tape is “W”, the winding tension defined by the load in the pulling direction with respect to the tape width (W) is “T”, and the cover tape is on the winding shaft side. When the suppression pressure (linear pressure) to P is “P”, the following relational expression (a) (b): W / 5.3 = (9.0 to 14.0) / T ... (a) P = 8 .0 × T to 12.0 × T (B) is established. Winding products cover tape. 2. A cover tape having a thickness of 30 to 70.
The cover tape take-up product according to claim 1, wherein the cover tape take-up product has a thickness of μm.