JP4288291B2 - Carrier tape paper and carrier tape - Google Patents

Description

  The present invention relates to a carrier tape for storing a chip-shaped surface-mounted electronic component (chip-type electronic component) and transporting it to a surface-mounting machine (mounter), and a carrier tape used therefor, used when manufacturing an electronic circuit. It is about paper.

In the automatic production of electronic equipment, a technique is used in which surface-mount type electronic components are automatically mounted on a substrate by a surface mounter. In order to supply electronic components to the surface mounter, a width of 6 to 9 mm and a thickness of 0.4 to 4 including a cavity portion (storage portion) for storing electronic components and a marginal portion for feeding into the surface mounter are provided. A 1.2 mm carrier tape is used. In general, those having a width of 8 mm and a thickness of 0.7 to 1.0 mm are often used.
This carrier tape is made of paper or plastic, but it is considered preferable to be made of paper because of its low cost, light weight, easy disposal, and non-charging properties.
As a specific form of the carrier tape, the cavity portion for storing the component and the marginal portion for feeding the carrier tape are through holes, and the surface is sealed (closed) with the top cover tape in a state where the surface mount component is stored. For example, a punch carrier tape whose back surface is sealed with a bottom cover tape, an emboss carrier tape whose cavity is a recess formed by embossing, and whose top surface is sealed with a top cover tape are known.
Among these, the punch carrier tape is a state where the surface mount component is accommodated, the front surface is sealed with a top cover tape, the back surface is sealed with a bottom cover tape and wound, and the top cover tape is peeled off in the next process. The mounted component is taken out. At this time, it is required that the top cover tape is stably peeled off from the carrier tape paper and the surface of the carrier tape paper is not fluffed or paper dust or the like is not generated from the surface of the carrier tape paper. On the other hand, in order to stably secure (hold) the mounted component at a predetermined position, the bottom cover tape on the back surface is required to have good adhesion to the carrier tape paper.
The adhesiveness between the carrier tape paper and the top cover tape or the bottom cover tape is disclosed in, for example, Patent Documents 1 to 5.
By the way, in the above carrier tape, electronic parts are loaded in the cavity, sealed with a top cover tape, and wound on a cassette reel having a diameter of about 5 cm (record winding method), or about 20 cm in diameter and about 10 cm in width. It is shipped in a state of being wound in a spiral shape (traverse winding) on a paper tube, and used by the end user by mounting it on a surface mounter. In recent years, the traverse winding method has the advantages of reducing the joint work because the winding length per turn can be increased compared to the record winding method, speeding up the electronic component loading process, and improving work efficiency. It has come to be used frequently.
However, the conventional carrier tape has a problem that when it is rubbed against a cassette reel or the like, it is bent without being bent along the outer peripheral surface of the reel or tube and wrinkles are generated. In general, the phenomenon of bending and wrinkling becomes significant when the thickness of the carrier tape used is 550 μm or more, and becomes remarkable when the cassette reel diameter is as small as 5 to 6 cm. And when the crease occurs in this way and wrinkles occur on the inner surface side, the crease also appears on the surface of the crease part, and this convex part is caught on the guide part of the surface mounter in the next process to mount the component on the surface. Cannot be stably loaded into the aircraft. In surface mounters, the top cover tape is pulled from the carrier tape while pulling it at a constant tension, and the electronic components inside the cavity are taken out. The cover tape peels off and floats. Then, the surface mounter cannot pull the top cover tape with a constant tension, and the carrier tape pulled by the surface mounter flutters, so that the electronic components in the cavity portion cannot be detached or loaded at a desired position. For this problem, for example, Patent Literature 6 and Patent Literature 7 are disclosed.
However, according to any proposal, the adhesiveness and peelability of the cover tape and the fuzz suppressing effect on the surface of the carrier tape are not sufficient, and there is room for further improvement. However, according to the study by the present inventors, there is a limit to the improvement effect only by modifying the surface of the carrier tape, and there is a problem of bending or wrinkling of the carrier tape at the time of reel winding or winding, or at the time of rewinding. It is necessary to improve together.
JP 2007-161274 A JP 2007-1589 A JP 2006-232277 A JP 2004-306986 A JP 2003-137386 A JP 2002-46769 A JP-A-3-249300

  The main problem to be solved by the present invention is an excellent balance of adhesiveness and peelability with the top cover tape, and no fluff or paper dust is generated on the surface of the carrier tape paper when the top cover tape is peeled off, preferably the bottom cover tape It is an object of the present invention to provide a carrier tape sheet and a carrier tape that are excellent in adhesiveness, improve the problems of bending and wrinkling of the carrier tape, and can stably peel off the top cover tape.

The present invention that has solved this problem is as follows.
[Invention of Claim 1]
A carrier tape paper having a thickness of 0.4 to 1.2 mm with a surface treatment agent coated on the front and back surfaces of the base paper, and a carrier for chip-type electronic components is formed on the carrier tape paper to cover the front and back surfaces. It is used for a punch carrier tape in a form in which the tape is bonded and the container is closed,
The base paper is made of multilayer paper,
And the said surface treating agent contains water-soluble polymer and styrene acrylic resin,
The peel strength between the cover tape of the carrier tape sheet surface below 1400mN least 800 mN, peel strength between the carrier tape paper rear face of the cover tape Ri der least 1500mN less 1000 mN,
The base paper is a multilayer paper having a surface layer, at least one intermediate layer and a back layer,
The freeness of the back layer is relatively 30 cc to 100 cc lower than the freeness of the intermediate layer adjacent to the back layer;
The coating amount in terms of solid content of the surface treatment agent containing the water-soluble polymer and styrene / acrylic resin on the back side of the base paper is the surface treatment agent containing the water-soluble polymer and styrene / acrylic resin on the surface of the base paper. The coating amount in terms of solid content is 110 to 500%,
The curl evaluation value to the back layer side measured by the following procedures (1) to (6) is 3 to 10 mm.
Carrier tape paper characterized by that.
Here, the peel strength is measured according to the following test method.
<Test method>
The carrier tape paper and the cover tape (made by Nippon Matai Co., Ltd., trade name “NC tape”) are cut out to a width of 8 mm and a length of 300 mm, respectively. Heat seal at 160 ° C. for 1 second, and leave at 23 ° C. and 50% humidity for 15 minutes. Next, a universal tensile tester is used, and the peel strength is peeled 180 degrees at a speed of 500 mm / min, and the peel strength is defined as the load at the time of peeling.
<Measurement method of curl evaluation value>
(1) The carrier tape sheet is cut into a square of 10 cm in the flow direction and 10 cm in the width direction to obtain a measurement sample.
(2) Five measurement samples are prepared for each carrier tape sheet.
(3) The five samples are subjected to moisture absorption / desorption treatment in which the humidity is continuously changed in the order of 65% RH, 25% RH, 65% RH, and 85% RH in a constant temperature environment of 23 ° C. At this time, a maintenance time of 2 hours is provided under each humidity.
(4) After repeating the moisture absorption / desorption treatment for 3 cycles, the 5 samples are further left in an environment of 23 ° C. and 65% RH for 3 hours, and then the warpage of the 5 samples is measured. .
(5) The degree of warpage is measured by placing the warped sample on the horizontal table with the convex surface downward, and measuring the distance from each of the four vertexes to the sample mounting surface of the horizontal table. The average value of the measured points is used as the reference curl value.
(6) The average value of the reference curl values of the five samples is defined as the curl evaluation value (mm) of the carrier tape paper.

[Invention of Claim 2]
The base paper is a multilayer paper having a surface layer, at least one intermediate layer and a back layer,
The raw material pulp of the surface layer contains 70 to 95% by mass of LBKP.
The carrier tape sheet according to claim 1.

[Invention of Claim 3 ]
3. A carrier tape comprising a carrier tape sheet according to claim 1 or 2, wherein an accommodating portion for chip-type electronic components is formed.

  According to the present invention, it has an excellent balance between adhesiveness and peelability with the top cover tape, no fluffing or paper dust is generated on the surface when the top cover tape is peeled off, preferably excellent adhesiveness with the bottom cover tape, and carrier tape. In this case, the problem of creases and wrinkles is improved, so that the top cover tape can be stably peeled off, resulting in a carrier tape sheet and a carrier tape.

Embodiments of the present invention will be described in detail below with specific examples.
The carrier tape paper of this embodiment is obtained by coating a surface treatment agent on the surface of a base paper having a surface layer, an intermediate layer, and a back layer manufactured by multilayer papermaking. However, the base paper is not limited to this three-layer structure, and may be a four-layer structure having a plurality of intermediate layers, or a multilayer structure having more than that. Here, the reason for making the multi-layer paper is that moderate entanglement between the pulp fibers occurs between the layers, so that appropriate integrity of the layers can be obtained. In addition, in the multi-layer papermaking, the composition of the raw materials of each layer can be freely changed.For example, while using waste paper pulp in the intermediate layer, virgin pulp can be used for the surface layer and the back layer, and the surface layer, intermediate layer and The degree of drainage can be adjusted in each of the back layers, the basis weight of each layer can be easily adjusted, and quality can be easily ensured while using waste paper pulp that contributes to recycling. There are advantages.

  Further, carrier tape paper having a high basis weight has an advantage that high productivity can be obtained by making a multi-layer paper. In other words, when carrier tape paper having a high basis weight is manufactured in a single layer, there is a problem that the dewaterability and drying property in the paper machine are extremely poor, and the production speed is low, and the low basis weight single layer paper In the manufacturing method in which the sheet is bonded later, there is a problem that a bonding process is required separately from the manufacturing of the single-layer paper, and the production efficiency is deteriorated. On the other hand, when multi-layer papermaking is used, these problems do not occur.

  Examples of the raw material pulp used for each papermaking layer of the carrier tape paper of this embodiment include hardwood bleached kraft pulp (LBKP), softwood bleached kraft pulp (NBKP), hardwood unbleached kraft pulp (LUKP), and softwood unbleached kraft pulp ( NUKP), hardwood semi-bleached kraft pulp (LSBKP), softwood semi-bleached kraft pulp (NSBKP), hardwood sulfite pulp, softwood sulfite pulp and other chemical pulp, stone grand pulp (SGP), pressurized stone grand pulp (PGW), refiner Mechanical pulp such as ground pulp (RGP), thermomechanical pulp (TMP), chemi-ground pulp (CGP), groundwood pulp (GP), thermomechanical pulp (TMP), tea waste paper, craft envelope waste paper, magazine waste paper, newspaper waste paper, Flyer waste paper, office waste paper Waste paper pulp made from corrugated paper, upper white waste paper, Kent waste paper, imitation waste paper, waste paper waste paper, etc., disaggregation / deinking waste paper pulp, disaggregation / deinking / bleached waste paper pulp, or kenaf, hemp, straw, etc. One or several kinds of known various pulps such as pulps chemically or mechanically produced from non-wood fibers can be appropriately selected and used. However, when it is necessary to reduce the filler in consideration of the influence on the surface mount component, it is preferable to use virgin pulp rather than used paper pulp such as diinking pulp and waist pulp.

  In particular, LBKP and NBKP are suitable for the front surface layer and the back surface layer of the carrier tape paper in order to achieve their roles and various quality characteristics in a balanced and efficient manner. In particular, it is preferable to contain 70 to 95% by mass of LBKP. When the content of LBKP is 70 to 95% by mass, while maintaining the surface strength and rigidity required for carrier tape paper, a good texture can be obtained and the adhesiveness to the top cover tape becomes better, and the top cover When peeling the tape, a stable peel-off strength can be obtained. When the content of LBKP in the raw material pulp of the surface layer is less than 70% by mass, it becomes difficult to obtain a good texture, and the adhesiveness with the top cover tape tends to vary, and when the top cover tape is peeled off The running of the carrier tape may not be stable, and production efficiency may be reduced. On the other hand, when the content of LBKP exceeds 95% by mass, the surface strength and rigidity are lowered, and when the top cover tape is peeled off, fuzz and paper dust are generated, and the chip-type electronic component is stored in and taken out from the carrier tape. Cause the production efficiency to drop.

  On the other hand, it is preferable to contain mechanical pulp, especially in the intermediate layer. Moreover, it is preferable to mix LBKP and NBKP. By including mechanical pulp, the formation of the intermediate layer is improved, and the generation of creases and wrinkles starting from uneven formation is prevented. Furthermore, by including mechanical pulp, the flexibility of the intermediate layer is improved, and it becomes a characteristic that can be adapted to a curved shape generated when it is rubbed against a reel or a tube, and further exhibits the effect of preventing folding and wrinkling.

  Examples of suitable mechanical pulp include groundwood pulp (GP), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), and pressurized groundwood pulp (PGW). Among these mechanical pulps, thermomechanical pulp (TMP) and pressured ground wood pulp (PGW) that generate less binding fibers and paper dust are particularly preferable.

  The content of mechanical pulp in the intermediate layer is preferably 5% or more, and more preferably 10% or more from the viewpoint of imparting cushioning properties to the intermediate layer and preventing surface folding and wrinkling. In addition, when there is much content of mechanical pulp, since intensity | strength will become low and there exists a possibility of paper dust generation | occurrence | production from a cross section and delamination in an intermediate | middle layer, 30% or less is preferable.

  Here, when the mechanical pulp is contained in the intermediate layer, it can be contained by using waste paper pulp as a raw material. For example, waste paper, kraft envelope waste paper, magazine waste paper, newspaper waste paper, leaflet waste paper, office waste paper, corrugated waste paper, Kami white waste paper, Kent waste paper, imitation waste paper, ground ticket waste paper, etc. Waste paper pulp or disaggregation / deinking / bleached waste paper pulp may be used as a raw material for the intermediate layer. Among these waste paper pulps, especially as raw materials for the intermediate layer, waste paper made from tea waste paper and kraft envelope waste paper that has high surface strength, stiffness, tensile strength, interlayer strength, etc., and excellent mechanical properties, including mechanical pulp. Pulp is preferred.

  On the other hand, in the carrier tape sheet of this embodiment, the freeness of the back surface layer is preferably lower by 30 cc or more than the freeness of the intermediate layer adjacent to the back surface layer, more preferably 30 cc to 100 cc. By making the freeness of the back layer relatively 30 cc lower than the freeness of the intermediate layer adjacent to the back layer, the curl adjustment to the back layer side becomes easier. However, when the freeness of the back surface layer is relatively lower than the freeness of the intermediate layer adjacent to the back surface layer by more than 100 cc, the fiber entanglement between the back surface layer and the intermediate layer adjacent to the back surface layer becomes worse, 100cc or less because there is a high risk of delamination due to bending stress or ironing force that accompanies a change in the curved shape that occurs when the carrier tape is wound on a core having a diameter of about 50 mm or when it is rolled back. Is desirable.

  In this specification, the freeness is measured by a Canadian standard freeness tester according to JIS-P8121, after the sample pulp is disaggregated according to JIS-P8220. It is the value of water.

  When delamination occurs, there are problems that the carrier tape travels stably when the top cover tape is peeled off, and that the chip-type electronic component cannot be set at a predetermined position.

  Here, the freeness of the raw material pulp used for the back layer is preferably 300 to 450 cc, more preferably 320 to 430 cc.

  Moreover, it is preferable that the freeness of the raw material pulp of the intermediate | middle layer adjacent to a back surface layer shall be 330-480cc, and it is more preferable to set it as 350-450cc. If the free layer in the intermediate layer is less than 330 cc, the carrier tape is likely to be broken and wrinkled, and if it exceeds 480 cc, the paper surface strength and rigidity tend to decrease, so paper dust is likely to occur. It becomes inferior in processability as a tape paper.

  In the carrier tape sheet of this embodiment, an internal additive chemical can be added to the raw pulp or pulp slurry for forming each layer as necessary. For example, chemical fixing agents such as sulfuric acid bands, sizing agents such as rosin, paper strength enhancers such as polyacrylamide and starch, drainage / yield improvers such as polyamide, waterproofing agents such as polyamide, polyamine and epichlorohydrin, A foaming agent, a basic dye, an acid dye, an anionic direct dye, a cationic direct dye, or the like can be appropriately used.

Next, the surface treatment agent applied to the surface of the base paper will be described in detail.
In the carrier tape paper of this embodiment, a surface treatment agent containing a water-soluble polymer and a peel adjusting agent is applied to the front and back surfaces of the base paper. As a result, the surface on the side in contact with the top cover tape has an excellent balance between adhesiveness and peelability with the top cover tape, and when the top cover tape is peeled off, no fuzz or paper dust is generated on the surface of the carrier tape. The back surface on the side in contact with the bottom cover tape can be adjusted to have excellent adhesion to the bottom cover tape.

  As peel modifiers, styrene-olefin-acrylic acid copolymers, alkenyl succinic anhydride derivatives, alkyl ketene dimers, styrene / maleic acid resins, olefin / maleic acid resins, polyethyleneimines, wax compounds, and the like are known. However, in this embodiment, a styrene / acrylic resin is used.

  Styrene / acrylic resin that can be used particularly preferably in this embodiment has a high effect of peel strength when heat-sealing with a top cover tape, and subsequent peelability, compatibility with water-soluble polymers, and synergistic effect Styrene-methacrylic acid copolymer and styrene-acrylic acid copolymer which are excellent in

  The melting point of the styrene / acrylic resin is preferably 80 to 120 ° C, and more preferably 85 to 110 ° C. When the melting point is 120 ° C. or lower, heat fusion by heat energy at the time of heat sealing becomes sufficient, and a sufficient effect of improving heat seal adhesion performance can be obtained. When the cover tape is peeled off, there is no possibility that the surface of the carrier tape becomes fuzzy or the paper layer is broken.

  The average molecular weight of the styrene / acrylic resin is preferably 1500 to 15000 from the viewpoint of the balance between the peel strength with the cover tape and the coating operability.

  Here, it is preferable to adjust the blending amount of the peel adjusting agent (styrene / acrylic resin) between the front surface and the back surface of the base paper as follows.

  For the surface of the base paper on the side in contact with the top cover tape, it is preferable to use a surface treatment agent in which 1 to 17% by mass of a peel modifier is mixed with 100% by mass of a water-soluble polymer as a solid content. More preferably, it is set to ˜13% by mass. When the peel modifier is less than 1% by mass, it is difficult to obtain a sufficient effect of improving heat seal adhesion performance. If the peel modifier exceeds 17% by mass, the effect of improving the heat seal adhesion performance can be enhanced, but on the other hand, fluffing may occur when the top cover tape is peeled off.

  For the surface of the base paper on the side in contact with the bottom cover tape, it is preferable to use a surface treatment agent obtained by mixing 9 to 35% by weight of a water-soluble polymer as a solid content with 9 to 35% by weight of a water-soluble polymer. It is more preferable to set it to -35 mass%. If the peel modifier is less than 9% by mass, it is difficult to obtain a sufficient heat seal bonding performance improvement effect required for the back surface (bottom surface). If the peel modifier exceeds 35% by mass, the effect of improving the heat seal adhesion performance can be enhanced, but even if mixed more than this, the effect of improving the adhesion performance reaches its peak, which only increases the cost.

  Moreover, as said water-soluble polymer, 1 type (s) or 2 or more types can be used from starch, polyvinyl alcohol (PVA), polyacrylamide (PAM), etc. Especially, it is preferable to use polyvinyl alcohol (PVA) and starch from points, such as surface strength, adhesiveness with a top cover tape, and heat resistance.

  The average molecular weight of the water-soluble polymer varies depending on the type of water-soluble polymer used, but is preferably 50,000 or more. When polyvinyl alcohol (PVA) is used, the polymerization degree is 1000. The saponification degree is preferably 97% or more, more preferably 98% or more. PVA, which has a high saponification degree, swells only in cold water, hardly dissolves, but dissolves in high-temperature water. Therefore, the adjustment of the coating solution is complicated, but the dielectric constant is the same as that of an insulator, and it can be used as an antistatic measure for electronic components. It is effective, has high film strength, and low hygroscopicity, so it has excellent heat seal adhesion to the cover tape, and is effective in suppressing the generation of paper dust.

The coating amount of the surface treatment agent containing a water-soluble polymer and peel adjusting agent is preferably a normally 0.1~4.0g / m ^2. However, in this embodiment, as described above, the surface of the base paper in contact with the top cover tape has an excellent balance of adhesiveness and releasability with the top cover tape, and when the top cover tape is peeled off, fuzz and paper dust are formed on the surface. It is a preferred embodiment that the back side of the base paper that does not occur and is in contact with the bottom cover tape is adjusted to have excellent adhesion to the bottom cover tape. Thus, from these points, the surface treatment agent containing the water-soluble polymer and the peel adjusting agent described above is applied to the surface of the base paper in contact with the top cover tape in an amount of 0.1 to 2.0 g / m ^2. It is more preferable to apply 0.1 to 1.5 g / m ² . When the coating amount is less than 0.1 g / m ^2, there is a possibility of occurrence of fuzzing at the time the top cover tape peeling. Also, when peeling from the carrier tape while pulling the top cover tape at a constant tension, the carrier tape becomes unstable due to delamination of the base paper, and the electronic components in the cavity part can be taken out stably and accurately. May be difficult. When the coating amount exceeds 2.0 g / m ² , it becomes difficult to adjust the base paper to a desired curl value. In addition, the drying property after coating and impregnation with the surface treatment agent is deteriorated, the productivity is lowered, and dirt is easily generated in the subsequent process. Moreover, it is preferable to apply 0.1 to 4.0 g / m ² of a surface treatment agent containing a water-soluble polymer and a peel modifier on the back surface of the base paper on the side in contact with the bottom cover tape. It is more preferable to apply 0.5 g / m ² . If the coating amount is less than 0.1 g / m ² , it becomes difficult to adjust the base paper to a desired curl value. When the coating amount exceeds 4.0 g / m ² , the suitability for coating deteriorates due to an increase in viscosity at the time of coating, and the problem of wrinkles / stains and paper breakage tends to occur. Moreover, the drying property after coating and impregnation with the surface treatment agent is deteriorated, and the productivity is lowered. Although there is a method of internally adding a water-soluble polymer to each of the front and back layers, external addition is preferable from the viewpoint of quality, cost and operability.

  The carrier tape paper of this embodiment preferably has a peel strength with the top cover tape of 800 mN or more and 1400 mN or less, and more preferably 900 mN or more and 1200 mN or less. If the peel strength is less than 800 mN, the adhesiveness with the top cover tape is insufficient, and unexpected peeling trouble may occur in the electronic component taking-out process. If it exceeds 1400 mN, the adhesiveness with the top cover tape is excessive. As a result, fuzz on the surface of the base paper and destruction of the paper layer occur in the electronic component removal process.

  On the other hand, the carrier tape paper of this embodiment preferably has a peel strength with the bottom cover tape of 1000 mN or more and 1500 mN or less. If the peel strength is less than 1000 mN, the adhesiveness to the bottom cover tape is insufficient, and the bottom cover tape may partially float, and an unexpected peeling trouble may occur in the electronic component removal process. . On the other hand, if it exceeds 1500 mN, the adhesiveness with the bottom cover tape becomes excessive, resulting in unnecessary cost increase. Further, since the surface treatment agent is applied excessively, there is a risk of causing operational troubles due to dirt, paper breakage, and poor drying during coating.

Here, in this specification, peel strength is measured according to the following test methods.
<Test method>
Carrier tape paper and carrier tape cover tape (manufactured by Nippon Matai Co., Ltd., trade name “NC tape”) are cut into a width of 8 mm and a length of 300 mm, respectively, to prepare samples. About the obtained sample, it heat-seals for 1 second at 160 degreeC at 1 place and the location of 1 mm width at the position of 1 mm and 6 mm from the edge in the width direction for 1 second, and is left to stand for 15 minutes in 23 degreeC and a humidity 50% environment. Next, a universal tensile tester is used, and the peel strength is peeled 180 degrees at a speed of 500 mm / min, and the peel strength is defined as the load at the time of peeling.

  By the way, in addition to reforming the front and back surfaces of the carrier tape paper, it is necessary to improve the problem of carrier tape bending and wrinkling at the time of reel winding, winding state, or rewinding. From this point, the coating amount of the surface treatment agent containing the water-soluble polymer and the styrene / acrylic resin on the back surface of the base paper is the same as the coating amount of the surface treatment agent containing the water-soluble polymer and the styrene / acrylic resin on the base paper surface. It is preferable that the solid content ratio is 110 to 500% with respect to the work amount. By setting it within this range, the adjustment to the curl value described later can be facilitated, the problem of bending and wrinkling of the carrier tape can be improved, and the top cover tape can be peeled stably.

  The carrier tape sheet of this embodiment has a curl evaluation value on the back layer side of 3 to 10 mm measured by the following procedures (1) to (6). Preferably, it is 5 to 8 mm on the back layer side. When the curl evaluation value on the back layer side is less than 3 mm, the effect of preventing the occurrence of folds and wrinkles is small at the time of reeling or in the state of winding, and when the curl to the back layer side exceeds 10 mm, When the top cover tape is peeled off, it tends to bend and wrinkle toward the surface layer. Here, the curl evaluation value is not a warp caused by an external force factor such as a curl curl, but a warp inherent to the carrier tape paper, as will be apparent from the following procedure. .

<Measurement method of curl evaluation value>
The measurement is performed according to the following procedures (1) to (6).
(1) The carrier tape sheet to be measured is cut into a square of 10 cm in the flow direction and 10 cm in the width direction to obtain a measurement sample.
(2) Prepare five samples for each carrier tape sheet to be measured.
(3) Each cut sample is subjected to moisture absorption / desorption treatment in which the humidity is continuously changed in the order of 65% RH, 25% RH, 65% RH, and 85% RH in a constant temperature environment of 23 ° C. At this time, a maintenance time of 2 hours is provided under each humidity.
(4) After repeating the moisture absorption / desorption treatment for 3 cycles, each sample is further allowed to stand in an environment of 23 ° C. and 65% RH for 3 hours, and then the warpage of each sample is measured.
(5) Measurement of the degree of warping is placed on a horizontal table with the convex surface of the warped sample facing downward, and in such a state, the distance from each vertex to the sample mounting surface of the horizontal table is measured, respectively. The average value of the measured values at these four locations is taken as the reference curl value.
(6) The average value of the reference curl values of the five samples is defined as the curl evaluation value (mm) of the carrier tape paper.

  In the present embodiment, the coating apparatus used for coating and impregnating the surface layer and the back layer with a surface treatment agent containing a water-soluble polymer and a peel adjusting agent is not particularly limited. For example, an air knife coater, A blade coater, a rod coater, a bar coater, a gate roll coater, a roll coater such as a size press, a velbapa coater, a calender coater, and the like can be used as appropriate.

  In order to increase the amount of coating / impregnation to the back layer more than the amount of coating / impregnation to the surface layer, for example, the concentration of the water-soluble polymer in the coating liquid to be applied / impregnated to the front and back layers What is necessary is just to change or change the coating frequency with respect to each layer. For example, it may be applied to the back surface layer twice by a calendar coating machine and applied to the surface layer once.

  After applying and impregnating the surface treatment agent, it is preferable to smooth the front and back surfaces with a calendar device. The calendar device for performing the surface smoothing treatment is not particularly limited, and for example, a machine calendar, a soft calendar, a Yankee dryer, etc. are used as appropriate. The surface smoothing treatment is performed according to JIS P 8151 print surf tester method (area type flow meter type print surf tester; hereinafter also referred to as PPS). The degree of smoothness when measured as is preferably 5.0 to 8.0 μm.

  Further, in the carrier tape sheet of this embodiment, the interlayer strength in the Z-axis direction measured according to TAPPI UM522 is preferably 1.1 to 1.7, and more preferably 1.3 to 1.6. . In order to set the interlayer strength to 1.1 to 1.7, selection and adjustment of raw materials for each layer, adjustment of freeness, adjustment of basis weight, addition of paper strength enhancer, and adhesive such as starch between layers It can be achieved by a method such as spraying. When the interlaminar strength is less than 1.1, the fiber entanglement between the layers deteriorates, and delamination may occur due to the stress strain accompanying the change to the curved shape that occurs when it is rubbed against a reel or the like. is there. On the other hand, when the interlayer strength exceeds 1.7, it is necessary to take measures such as increasing the amount of the paper strength enhancer added or spraying more adhesive such as starch between the layers. Excessive quality will lead to unnecessary cost increases. Further, when not relying on chemicals, at least the raw material pulp, the freeness, the basis weight, etc. of each layer need to be substantially the same, making it difficult to achieve the curl value desired by this embodiment.

  Further, the carrier tape paper of this embodiment preferably has a surface strength measured according to TAPPI T459 om-83 of the surface layer of 12 A or more, more preferably 14 A. In order to make the surface strength 12A or more, it can be achieved by a method such as coating and impregnation with a raw material blending ratio, a raw pulp slurry freeness, and a water-soluble polymer. When the surface strength of the surface to which the top cover tape is bonded is less than 12A, the pulp fiber on the surface of the carrier tape paper is taken in the process of peeling the top cover tape, resulting in paper dust and poor operability. Cause it.

  The carrier tape sheet according to the present embodiment is cut into a medium original fabric having a width of about 15 to 20 cm, then cut into a product width (for example, 8 mm width), and subjected to appropriate processing such as punching to store a component to be conveyed. And a marginal part for tape feeding are formed to form a carrier tape.

  Next, the effects of the present invention will be clarified by describing examples and comparative examples of the present invention. Of course, the present invention is not intended to be limited to the following examples. In the following test examples, “%” means “mass%” unless otherwise specified.

[Example 1]
A carrier tape paper was obtained by applying a surface treatment agent to a base paper having a structure in which a surface layer, an intermediate layer and a back layer were laminated.
The surface layer was adjusted so that the Canadian standard freeness (CSF) was 420 ml when the pulp slurry of 10% softwood bleached kraft pulp (NBKP) and 90% hardwood bleached kraft pulp (LBKP) was disintegrated after paper making. To this, sizing agent (R50, manufactured by Modern Chemical Industry Co., Ltd.) is added in an amount of 0.25% in terms of solid content, and PAM (made by Harima Kasei Co., Ltd., Hermide B-15) is added in an amount of 0.15% in terms of solid content. Further, a papermaking raw material whose pH was adjusted to 5 by adding a sulfuric acid band was used.
Concerning the back layer, the pulp slurry of 10% softwood bleached kraft pulp (NBKP) and 90% hardwood bleached kraft pulp (LBKP) was adjusted so that the Canadian Standard Freeness (CSF) when disaggregated after papermaking was 350 ml. In addition, sizing agent (R50 manufactured by Modern Chemical Industry Co., Ltd.) is added in an amount of 0.25% in terms of solid content, and PAM (made by Harima Kasei Co., Ltd., Hermide B-15) is added in an amount of 0.15% in terms of solid content. Further, a papermaking raw material having a pH adjusted to 5 by adding a sulfuric acid band was used.
For the intermediate layer (3 layers), adjust the pulp slurry at a rate of NBKP 50%, LBKP 40%, and thermomechanical pulp (TMP) 10% so that the Canadian Standard Freeness (CSF) when disaggregated after papermaking is 400 ml. In addition, a sizing agent (R50 manufactured by Modern Chemical Industry Co., Ltd.) is added to 0.30% in terms of solid content, 0.5% of PAM (produced by Harima Kasei Co., Ltd., Hermide B-15) is added to the solid content, and further A papermaking raw material having a pH adjusted to 5 by adding a sulfuric acid band was used.
These papermaking raw materials are multi-layered with a three-layered intermediate layer and a five-layer structure with a basis weight of 60 g / m ^{2 for} the surface layer and 80 g / m ² for the back layer, using a circular multi-layer paper machine. A predetermined amount of a surface treatment agent prepared as shown below and coated on the front and back surfaces of the paper with a calender coating machine is obtained, and a carrier tape paper having a basis weight of 580 g / m ^{2 according} to Example 1 is obtained. It was. Note that the basis weight of the intermediate layer was finely adjusted according to the coating amount of the surface treatment agent.
(Adjustment of surface treatment agent on the surface)
Polyvinyl alcohol (manufactured by Nippon Synthetic Chemical Co., Ltd., Gohsenol N300) 100% by mass, styrene-methacrylic acid copolymer resin (average molecular weight 9,000, melting point 100 ° C., trade name Kay coat SA930, manufactured by Modern Chemical Industry Co., Ltd.) 9% % were mixed, the prepared surface treating agent was 0.3 g / m ² coating.
(Adjustment of the surface treatment agent on the back side)
Polyvinyl alcohol (manufactured by Nippon Synthetic Chemical Co., Ltd., Gohsenol N300) 100% by mass, styrene-methacrylic acid copolymer resin (average molecular weight 9,000, melting point 100 ° C., trade name Kay coat SA930, manufactured by Modern Chemical Industry Co., Ltd.) 17% % Was mixed, and 0.7 g / m ^{2 of the} prepared surface treatment agent was applied.
The surface treatment agent was applied to the front and back surfaces as described above, and then dried and calendered.

[Examples 2 to 24 and Comparative Examples 1 to 3]
As shown in Table 1, carrier tape paper was obtained by changing various conditions. The conditions other than those shown in Table 1 were not changed.

[Comparative Example 4]
According to the method of patent document 1 (Unexamined-Japanese-Patent No. 2007-161274).
As a surface treatment agent, 100% by mass of polyvinyl alcohol (trade name: PVA117, manufactured by Kuraray) and 2.0% by mass of a styrene-olefin-acrylic acid copolymer resin (trade name: SS2910, manufactured by Seiko PMC) are mixed with the surface layer. The prepared surface treatment agent was applied at 0.3 g / m ² to produce a carrier tape paper. The same surface treating agent was also applied to the back surface by 0.3 g / m ² .

[Comparative Example 5]
According to the method of patent document 2 (Unexamined-Japanese-Patent No. 2007-1589).
As a surface treatment agent, 100% by mass of polyacrylamide (trade name: PS117, manufactured by Arakawa Chemical Industries) and 2.0% by mass of alkenyl succinic anhydride derivative (trade name size Pine SA-862, manufactured by Arakawa Chemical Industries) are mixed on the surface layer. The prepared surface treating agent was applied at 0.3 g / m ² to produce a carrier tape paper. The same surface treating agent was also applied to the back surface by 0.3 g / m ² .

[Comparative Example 6]
According to the method of patent document 2 (Unexamined-Japanese-Patent No. 2007-1589).
Surface treatment agent prepared by mixing 100% by mass of polyacrylamide (trade name: PS117, manufactured by Arakawa Chemical Industries) and 2.0% by mass of alkyl ketene dimer (trade name size Pine K-903) as a surface treatment agent on the surface layer. Was coated with 0.3 g / m ² to produce a carrier tape paper. The same surface treating agent was also applied to the back surface by 0.3 g / m ² .

[Comparative Example 7]
According to the method of patent document 3 (Unexamined-Japanese-Patent No. 2006-232277).
Surface prepared by mixing 100% by mass of polyvinyl alcohol (trade name: PVA117, manufactured by Kuraray) and 2.0% by mass of styrene / maleic resin (trade name: PM382, manufactured by Arakawa Chemical Industries) as a surface treatment agent on the surface layer. the treating agent, and 0.3 g / m ² coated, to produce a carrier tape sheet. The same surface treating agent was also applied to the back surface by 0.3 g / m ² .

[Comparative Example 8]
According to the method of patent document 3 (Unexamined-Japanese-Patent No. 2006-232277).
Surface prepared by mixing 100% by mass of polyvinyl alcohol (trade name: PVA117, manufactured by Kuraray) and 2.0% by mass of olefin / maleic resin (trade name: PM482, manufactured by Arakawa Chemical Industries) as a surface treatment agent on the surface layer. The treatment agent was applied at 0.3 g / m ² to produce a carrier tape paper. The same surface treating agent was also applied to the back surface by 0.3 g / m ² .

[Comparative Example 9]
According to the method of patent document 4 (Unexamined-Japanese-Patent No. 2004-306986).
As a surface treatment agent on the surface layer, “Epomin P-1000” (polyethyleneimine, molecular weight 70,000, resin content 30% by mass) manufactured by Nippon Shokubai Co., Ltd. was diluted with water to a concentration of 4% by mass. A 4% by mass aqueous solution of “PVA-117” (polyvinyl alcohol, polymerization degree 1700) was mixed so that the dry mass ratio was 10:90, and the prepared surface treatment agent had a total dry coating amount of 0.5 g / m. It applied so that it might become ² .

[Comparative Example 10]
As a surface treatment agent on the surface layer, a blending ratio of “PVA-117” (polyvinyl alcohol, polymerization degree 1700) manufactured by Kuraray Co., Ltd. and a wax-based compound (trademark; Size Pine W-116H, manufactured by Arakawa Chemical Industries, Ltd.) 7 / The blended coating solution of No. 3 was applied at a coating amount of 0.5 g / m ² .

<Evaluation test>
An evaluation test was performed on the carrier tape sheets according to each of Examples and Comparative Examples created as described above. The results are shown in Table 1. The physical property measurement and the evaluation test were performed under environmental conditions of a temperature of 23 ° C. ± 1 ° C. and a humidity of 50 ± 2% in accordance with JIS-P8111. Moreover, the operativity about each Example and each comparative example was also evaluated. Details of each measurement method and test method are as follows.
(Basis weight)
Measured based on JIS P 8124 paper and paperboard-basis weight measurement method.
(Smoothness)
JIS P 8151 Paper and paperboard-Surface roughness and smoothness test method (air leak method)-Print surf tester method (area type flow meter type print surf tester), using soft backing, clamping device The smoothness of each of the front and back surfaces was measured with a backing of 1.0MPA.
(Peel strength)
About each carrier tape paper, the peel strength with a cover tape was measured by the test method mentioned above. The results are shown in Table 1. In addition, what was shown next was used as a cover tape.
Product name “NC tape” (manufactured by Nippon Matai Co., Ltd.), water-soluble heat-sensitive adhesive manufactured by Toyo Ink Mfg. Co., Ltd., and product name “Heat Magic DW” applied to a polyethylene film substrate.

<Part removal test>
Each carrier tape sheet was subjected to a component removal test as follows. The results are shown in Table 1.
The obtained carrier tape paper is hung on a chip-type electronic component loading device together with the bottom cover paper, and the electronic component loading cavity is formed, bottom cover paper bonding, electronic component loading, and top cover tape bonding are performed as a surface mount product. A carrier tape containing the electronic parts was obtained. Next, the cover tape was peeled off and the electronic component removal test was performed using an electronic component removal apparatus, and the following points were evaluated and evaluated.
(Fuzzing when peeling off the top cover tape)
The surface of the carrier tape after peeling the top cover tape was observed, and the amount of fuzz at the heat-sealed portion was confirmed. No fluffing ◎, slightly fluffing but no effect on electronic component removal ○, fuzzing had a slight effect on electronic component removal work △, fluffing seriously in electronic component removal work The case where the trouble occurred was marked as x.
(Runability when peeling off the top cover tape)
The running performance of the top cover tape when the top cover tape was peeled was evaluated. The running performance of the top cover tape is very good ◎, the running performance is good and the electronic parts are taken out well, the running performance is unstable and the electronic parts are taken out △, running Poor performance and serious trouble occurred in taking out electronic parts.
(Adhesiveness with bottom cover tape)
From peeling of the top cover tape to taking out the electronic parts, the carrier tape paper and the bottom cover tape have sufficient adhesion and are in close contact with each other. Good, ○ The bottom cover tape was partially lifted at the edge, which had a slight effect on the removal of electronic components. △, The bottom cover tape was lifted partially, which was critical for the removal of electronic components. X where trouble occurred.
(Evaluation of breakage)
For the evaluation of folding, ten samples having a flow direction of 30 cm and a width of 8 mm were prepared, and they were beaten on a 6 cm diameter cylinder, and the number of folds and wrinkles was visually counted. The average number per piece was evaluated according to the following criteria and shown in the table. Less than 1 was evaluated as ◎, 1 or more and less than 2 was evaluated as ◯, 2 or more and less than 5 Δ, and 5 or more were evaluated as ×.

  From Table 1, it can be seen that the carrier tape sheets of Examples 1 to 24 are excellent in quality evaluation. On the other hand, the carrier tape sheets of Comparative Examples 1 to 10 are inferior to Examples 1 to 24 in quality evaluation. As a result, the carrier tape paper of the present invention has an excellent balance of adhesion and peelability with the top cover tape, and when the top cover tape is peeled off, no fuzz or paper dust is generated on the surface of the carrier tape paper. It can be said that the adhesive property with the tape is excellent, the problem of the bending of the carrier tape is improved, and the top cover tape can be stably peeled off. Accordingly, it can be said that the carrier tape sheet and the carrier tape are excellent in stable production at the time of taking out the electronic components and have high production efficiency.

  The present invention relates to a carrier tape for storing a chip-shaped surface-mounted electronic component (chip-type electronic component) and transporting it to a surface-mounting machine (mounter), and a carrier tape used therefor, used when manufacturing an electronic circuit. Applicable as paper.

Claims (3)

A carrier tape paper having a thickness of 0.4 to 1.2 mm with a surface treatment agent coated on the front and back surfaces of the base paper, and a carrier for chip-type electronic components is formed on the carrier tape paper to cover the front and back surfaces. It is used for a punch carrier tape in a form in which the tape is bonded and the container is closed,
The base paper is made of multilayer paper,
And the said surface treating agent contains water-soluble polymer and styrene acrylic resin,
The peel strength between the cover tape of the carrier tape sheet surface below 1400mN least 800 mN, peel strength between the carrier tape paper rear face of the cover tape Ri der least 1500mN less 1000 mN,
The base paper is a multilayer paper having a surface layer, at least one intermediate layer and a back layer,
The freeness of the back layer is relatively 30 cc to 100 cc lower than the freeness of the intermediate layer adjacent to the back layer;
The coating amount in terms of solid content of the surface treatment agent containing the water-soluble polymer and styrene / acrylic resin on the back side of the base paper is the surface treatment agent containing the water-soluble polymer and styrene / acrylic resin on the surface of the base paper. The coating amount in terms of solid content is 110 to 500%,
The curl evaluation value to the back layer side measured by the following procedures (1) to (6) is 3 to 10 mm.
Carrier tape paper characterized by that.
Here, the peel strength is measured according to the following test method.
<Test method>
The carrier tape paper and the cover tape (made by Nippon Matai Co., Ltd., trade name “NC tape”) are cut out to a width of 8 mm and a length of 300 mm, respectively. Heat seal at 160 ° C. for 1 second, and leave at 23 ° C. and 50% humidity for 15 minutes. Next, a universal tensile tester is used, and the peel strength is peeled 180 degrees at a speed of 500 mm / min, and the peel strength is defined as the load at the time of peeling.
<Measurement method of curl evaluation value>
(1) The carrier tape sheet is cut into a square of 10 cm in the flow direction and 10 cm in the width direction to obtain a measurement sample.
(2) Five measurement samples are prepared for each carrier tape sheet.
(3) The five samples are subjected to moisture absorption / desorption treatment in which the humidity is continuously changed in the order of 65% RH, 25% RH, 65% RH, and 85% RH in a constant temperature environment of 23 ° C. At this time, a maintenance time of 2 hours is provided under each humidity.
(4) After repeating the moisture absorption / desorption treatment for 3 cycles, the 5 samples are further left in an environment of 23 ° C. and 65% RH for 3 hours, and then the warpage of the 5 samples is measured. .
(5) The degree of warpage is measured by placing the warped sample on the horizontal table with the convex surface downward, and measuring the distance from each of the four vertexes to the sample mounting surface of the horizontal table. The average value of the measured points is used as the reference curl value.
(6) The average value of the reference curl values of the five samples is defined as the curl evaluation value (mm) of the carrier tape paper. The base paper is a multilayer paper having a surface layer, at least one intermediate layer and a back layer,
The raw material pulp of the surface layer contains 70 to 95% by mass of LBKP.
The carrier tape sheet according to claim 1. 3. A carrier tape comprising a carrier tape sheet according to claim 1 or 2, wherein an accommodating portion for chip-type electronic components is formed.