JP2007262614A - Paper for carrier tape and carrier tape - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper for a carrier tape to prevent the generation of folding when being wound on a reel or in a wound state and provide a carrier tape. <P>SOLUTION: The paper for carrier tape has a thickness of 700-1,200μm, and the ratio of the longitudinal stiffness under the application of load from the back side to the front side in conformity to JIS-P8125 to the longitudinal stiffness under the application of load from the front side to the back side in conformity to JIS-P8125 is 80-90%. A carrier tape produced by using the paper is also provided. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a carrier tape for storing chip-shaped surface-mounted electronic components and transporting them to a surface-mounting machine (mounter) and a carrier tape sheet used therefor, which are used when manufacturing an electronic circuit.

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 the electronic components to the surface mounter, the width is 6 to 9 mm including the cavity portion for storing the electronic components and the marginal portion for feeding into the surface mounter, and the base paper thickness is 0.4 to 1. A 0 mm carrier tape is used. In particular, generally those having a width of 8 mm and a thickness of 0.7 to 1.0 mm are often used.
There are paper and plastic carrier tapes. However, it is desirable that the carrier tape 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 for storing the parts and the marginal part for feeding the carrier tape are through holes, and the surface is sealed with the top cover tape in a state where the surface mount parts are stored, and the bottom surface. Is a punch carrier tape that is sealed with a bottom tape, or an embossed carrier tape whose cavity part is formed by embossing and whose surface is sealed with a top cover tape. An unpunched carrier tape or the like is known.
These carrier tapes are loaded with electronic parts in the cavity and sealed with a top cover tape, and are wound around a cassette reel having a diameter of about 5 cm (record winding method), or a paper tube having a diameter of about 20 cm and a width of about 10 cm. It is shipped in a state of being wound in a spiral shape (traverse winding), 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.
JP 2005-179797 A JP-A-3-249300 JP 2004-67222 A

However, when a conventional carrier tape is rubbed against a cassette reel or the like, the carrier tape may be bent without being bent along the outer peripheral surface of the reel or tube.
The phenomenon of folding becomes significant when the generally used paper thickness is 700 μm or more, and becomes remarkable when the cassette reel diameter is as small as 5 to 6 cm. And when a fold occurs in this way, a convex portion appears on the surface of the fold portion, and this convex portion is hooked on the guide portion of the surface mounting machine in the next process to stably load the component into the surface mounting machine. I can't. In surface mounters, the top seal is pulled from the carrier tape while pulling it at a constant tension, and the electronic components inside the cavity are taken out. However, when the carrier tape is broken, the top cover seal is peeled from the carrier tape at the folded portion. It will float. Then, the surface mounter cannot pull the top cover seal with a constant tension, and the carrier tape pulled by the surface mounter flutters, so that the electronic components in the cavity cannot be dropped off or loaded at a desired position.
SUMMARY OF THE INVENTION Accordingly, a problem to be solved by the present invention is that a carrier tape and a carrier capable of efficiently producing a multilayer paperboard having a thickness of 700 μm or more, and preventing the occurrence of folds at the time of reel winding or in the winding state. To provide tape paper.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
A multi-layered carrier tape paper having a surface layer as an outer surface of winding, a back layer as an inner surface of winding, and an intermediate layer therebetween,
The paper thickness is 700-1200 μm,
Paper stipulated in JIS-P8125 when a load is applied from the front side to the back side against the stiffness in the vertical direction of the paper stipulated in JIS-P8125 when a load is applied from the back side to the front side A carrier tape sheet characterized in that the ratio of stiffness in the vertical direction is 80 to 90%.

<Invention of Claim 2>
The surface layer and the back layer are coated or impregnated with a water-soluble polymer,
The carrier tape paper according to claim 1, wherein a mass ratio of the water-soluble high molecular weight coated or impregnated on the surface layer to the water-soluble high molecular weight coated or impregnated on the back layer surface is 120 to 250%.

<Invention of Claim 3>
The carrier tape paper according to claim 1 or 2, wherein 5 to 30% of mechanical pulp is contained in the intermediate layer.

<Invention of Claim 4>
The carrier tape paper according to any one of claims 1 to 3, wherein a difference in Canadian standard freeness based on JIS-P8121 between adjacent layers is 50 cc or less.

<Invention of Claim 5>
5. A carrier tape, comprising a carrier tape sheet according to any one of claims 1 to 4 having a cavity portion for storing a component to be conveyed and a marginal portion for feeding a tape.

  The carrier tape paper according to the present invention has a certain degree of integrity between the layers in the multi-layer paper making, and further, by providing an appropriate difference in stiffness between the front and back layers, Alternatively, the occurrence of folds on the side facing the take-up inner surface is greatly prevented when the tube is rubbed against the tube or in the rubbed state.

  Then, a difference in stiffness between the front and back surfaces can be suitably generated by applying and impregnating the water-soluble polymer.

  Moreover, when 5-30% of mechanical pulp is contained in the intermediate layer, the formation becomes good, and the occurrence of the folding start point due to uneven formation is prevented. Furthermore, the mechanical pulp also improves the flexibility of the intermediate layer, making it easier to exert the effect of the difference in stiffness between the front and back layers.

  Furthermore, if the difference in Canadian standard freeness (hereinafter also simply referred to as “freeness”) based on JIS-P8121 of each adjacent layer is 50 cc or less, the entanglement of fibers between adjacent layers is good, the interlayer strength is high, and the reel Occurrence of folds on the winding surface and separation between the layers when it is rubbed or the like is prevented.

  The carrier tape made of the carrier tape sheet of the present invention has advantages such as being extremely difficult to bend, and the top tape can be stably peeled off. Contributes to improvement.

Embodiments of the present invention will be described in detail below with specific examples.
The carrier tape paper of the present invention may be a paper having a surface layer, an intermediate layer, and a back layer manufactured by multilayer papermaking, and is not limited to a three-layer structure, but a multilayer of four or more layers having a plurality of intermediate layers. It may be a structure. 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 material of each layer can be made freely. For example, it is easy to use virgin pulp for the front and back layers while blending the used paper pulp in the intermediate layer, and contribute to recycling. There is an advantage that it is easy to achieve quality assurance while using.

  Here, as the raw material pulp used for each layer of the carrier tape paper according to the present invention, for example, hardwood bleached kraft pulp (LBKP), softwood bleached kraft pulp (NBKP), hardwood unbleached kraft pulp (LUKP), softwood unbleached kraft Pulp (NUKP), hardwood semi-bleached kraft pulp (LSBKP), softwood semi-bleached kraft pulp (NSBKP), hardwood sulfite pulp, softwood sulfite pulp, etc., chemical stone, stone grand pulp (SGP), pressurized stone grand pulp (PGW) , Refiner Grand Pulp (RGP), Thermomechanical Pulp (TMP), Chemi-Grand Pulp (CGP), Ground Pulp (GP), Thermomechanical Pulp (TMP), etc. Mechanical Pulp, Tea Waste Paper, Craft Envelope Waste Paper, Magazine Waste Paper, Newspaper Waste paper, flyer waste paper, off Waste paper, corrugated waste paper, Koji white waste paper, Kent waste paper, imitation waste paper, waste paper waste paper, etc. One or several kinds of known various pulps such as pulps chemically or mechanically produced from non-wood fibers such as straw 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 necessary for carrier tape paper, a good texture can be obtained and the adhesiveness to the top seal tape becomes better, and the top seal A stable peel-off strength can be obtained when the tape is peeled off. In addition, 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 seal tape tends to vary, and when the top seal tape is peeled off In addition, 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 the rigidity are lowered, and when the top seal tape is peeled off, fluffing and paper dust are generated, which causes a decrease in production efficiency.

  In particular, in the intermediate layer, mechanical pulp is suitable for achieving its role, contribution to recycling, various quality characteristics, etc. in a balanced and efficient manner. As the mechanical pulp, grandwood pulp (GP), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), pressured groundwood pulp (PGW), or the like can be used. Among these mechanical pulps, thermomechanical pulp (TMP) and pressured ground wood pulp (PGW) that generate less binding fibers and paper dust are preferable.

  Further, the content of mechanical pulp 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. When the blending amount is large, the strength is lowered, and there is a concern about generation of paper dust from the cross section or delamination in the intermediate layer, so 30% or less is preferable. In addition, the mechanical pulp amount of the intermediate layer after papermaking can be specified by “Paper, paperboard and pulp fiber composition test method” described in JIS-P8120.

  On the other hand, when the intermediate layer contains mechanical pulp, waste paper pulp can be used as a raw material for the intermediate layer. Used paper pulp includes tea waste paper, kraft envelope waste paper, magazine waste paper, newspaper waste paper, flyer waste paper, office waste paper, corrugated waste paper, Kamihaku waste paper, Kent waste paper, imitation waste paper, and old paper waste paper, etc.・ Deinked waste paper pulp or disaggregation / deinking / bleached waste paper pulp can be used. Among these waste paper pulps, especially as the raw material of the intermediate layer, in order to obtain various quality characteristics as carrier tape paper in a balanced and efficient manner, the surface strength, rigidity, tensile strength, interlayer strength, etc. are high, and the machine It is preferable to use waste paper pulp produced from office waste paper, tea waste paper, and craft envelope waste paper that contains pulp and has excellent cushioning properties.

  On the other hand, the carrier tape sheet of the present invention desirably has a difference in freeness between adjacent layers of 50 cc or less. When the difference exceeds 50 cc, the entanglement between the pulp fibers in adjacent layers becomes weak, and peeling occurs between the layers due to the bending and ironing force applied when the core is wound or wound back by a core having a diameter of about 50 mm. When the top seal tape is peeled off, the running of the carrier tape may not be stable.

  The freeness of each layer according to the present invention is a value measured by separating the carrier tape paper into each layer and then performing disaggregation processing based on JIS-P8220. However, this value is almost the same as the freeness of the raw pulp slurry. Here, as a method for separating each layer, the carrier tape sheet is immersed in water, and then the delamination is performed by applying a squeezing force. Other layers other than the measurement layer may be scraped off, and the point is not particularly limited as long as each layer can be separated from the other layers.

  Furthermore, the freeness of the raw material pulp used for each layer is preferably 300 to 500 cc, and more preferably 350 to 450 cc. That is, if the freeness is less than 300 cc, the fiber length is shortened, so there is a high risk of bending when the carrier tape is used, and if the freeness exceeds 500 cc, the surface strength and stiffness of the paper tends to decrease. Paper dust is likely to be generated, and it becomes inferior in processability as a carrier tape.

  In the raw material pulp or pulp slurry in the present invention, an internal additive chemical can be added 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, Examples include foaming agents, basic dyes, acid dyes, anionic direct dyes, and cationic direct dyes.

  On the other hand, the carrier tape paper of the present invention applied a load from the front surface side to the back surface side against the stiffness in the paper vertical direction defined in JIS-P8125 when a load was applied from the back surface side to the front surface side. The ratio of stiffness in the vertical direction of the paper defined in JIS-P8125 is 80 to 90%. Preferably it is 82 to 88%. If the ratio exceeds 90%, the carrier tape may fold on the surface of the carrier tape when it is scraped on a cassette reel or tube having a diameter of about 5 cm after being used as a carrier tape or when it is used after being rolled back. When the ratio is less than 80%, the rigidity when the carrier tape is used is insufficient, and the bending of the carrier tape causes bending on the back surface of the carrier tape against the bending and ironing force. Breaks and wrinkles will occur. Here, the stiffness in the longitudinal direction of the paper as defined in JIS-P8125 when a load is applied from the front side to the back side is 78 mN · m or more, preferably 85 mN · m or more and less than 140 mN · m. Is desirable. Further, the stiffness in the vertical direction of the paper as defined in JIS-P8125 when a load is applied from the back side to the front side is 87 mN · m or more, preferably 95 mN · m or more and less than 155 mN · m. Is desirable.

  When measuring a test piece with a width of 8 mm, the stiffness in the vertical direction of the paper defined in JIS-P8125 when a load is applied from the front side to the back side is 16 mN · m or more, preferably 17 mN. -It is desirable to set it to m or more, and when the load is applied from the back side to the front side, the stiffness in the paper vertical direction defined in JIS-P8125 is 18 mN · m or more, preferably 20 mN · m or more. Is desirable.

  In order to make the stiffness of the carrier tape paper within the scope of the present invention, it is simple and suitable to achieve by applying or impregnating a water-soluble polymer to the surface layer and the back surface layer. In this case, the mass ratio of the water-soluble high molecular weight coated or impregnated on the back layer surface to the water-soluble high molecular weight coated or impregnated on the surface layer is preferably 120 to 250%. As the water-soluble polymer to be coated or impregnated on the surface layer and the back layer, one or more water-soluble polymers from starch, polyvinyl alcohol (PVA), polyacrylamide (PAM), etc. should be used. Can do. Among these, it is preferable to use polyvinyl alcohol (PVA) from the viewpoints of surface strength, adhesion to the top cover tape, heat resistance, and the like.

The coating or impregnation amount on the surface layer is preferably 1.5 to 4.0 g / m ² in terms of solid content. More preferably, it is 1.5-2.5 g / m < ² >. If the coating / impregnation amount of the water-soluble polymer is less than 1.5 g / m ² , the surface layer side to the back layer side against the stiffness when a load is applied from the back layer side to the surface layer side of the paper It becomes difficult to make the ratio of stiffness when applying a load toward 80 to 90%. On the other hand, if it exceeds 4.0 g / m ² , the drying property after coating and impregnation is deteriorated, the productivity is lowered and soiling in the subsequent step is caused. Although there is a method of internally adding a water-soluble polymer to each of the front and back layers, it is preferable to externally add from the viewpoint of cost and operability.

In particular, the coating / impregnation amount for the back layer is preferably 0.5 to 2.0 g / m ² in terms of solid content. More preferably, it is 0.5-1.5 g / m < ² >. If the coating / impregnation amount on the back layer is less than 0.5 g / m ² , the surface strength and interlayer strength of the carrier tape may be insufficient. When it exceeds 2.0 g / m ² , it becomes difficult to set the stiffness ratio within the above range (80 to 90%). Moreover, the drying property after coating and impregnation is deteriorated, the productivity is lowered, and dirt may be produced in the subsequent process.

  The coating apparatus used for coating / impregnating the water-soluble polymer on the surface layer and the back layer is not particularly limited. For example, air knife coater, blade coater, rod coater, bar coater, gate roll coater, size press A roll coater such as velvapa coater, calendar coating and the like can be used as appropriate.

  In order to reduce the amount of coating / impregnation to the back layer to less than the amount of coating / impregnation to the front layer, for example, change the concentration of water-soluble polymer in the coating solution to be coated / impregnated on the front and back layers. It may be provided or the number of coatings for each layer may be made different. For example, it may be applied to the surface layer twice by a calender coating machine and once to the back layer.

  After coating and impregnating the water-soluble polymer, the front and back surfaces can be smoothed by 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, or the like is used as appropriate. Surface smoothing treatment is smoothness when the backing of the clamping device is measured as 1.0 MPA using soft backing in accordance with JIS P 8151 print surf tester method (area type flow meter type print surf tester). Is preferably 5.0 to 8.0 μm.

  Furthermore, in the carrier tape paper of the present invention, the surface strength of the surface layer measured according to TAPPI T459 om-83 is preferably 12A or more, and more preferably 14A. In order to make the surface strength 12A or more, it can be achieved by a method such as coating / impregnation with a raw material blending ratio, a raw pulp slurry's threeness, 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 topper cover tape, and it becomes paper dust and deteriorates operability. Cause it.

  The carrier tape paper described in detail above is cut into a medium thickness 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 or embossing to be conveyed. A cavity portion for storing components, a marginal portion for tape feeding, and the like are formed to obtain the carrier tape of the present invention.

  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, unless otherwise specified, “parts” and “%” mean “parts by mass” and “% by mass”, respectively, and “kg / t” means the amount per pulp ton. (Kg).

[Example 1]
For the surface layer and the back layer, sizing agent (R50 manufactured by Modern Chemical Industry Co., Ltd.) is added to the pulp slurry of 420 ml freeness consisting of 15% softwood bleached kraft pulp (NBKP) and 85% hardwood bleached kraft pulp (LBKP). A raw material in which 0.25% in terms of conversion and 0.15% in terms of solid content of PAM (manufactured by Harima Kasei Co., Ltd., Hermide B-15) was internally added, and a pH adjusted to 5 by adding a sulfuric acid band was used.
On the other hand, as an intermediate layer (2-4 layers), a sizing agent (R50 manufactured by Modern Chemical Industry Co., Ltd.) is added to a pulp slurry of 410 ml of freeness composed of NBKP 50%, LBKP 40%, and thermomechanical pulp (TMP) 10%. A raw material having 0.30% in terms of conversion and 0.5% PAM (Harmide B-15, manufactured by Harima Kasei Co., Ltd.) in terms of solid content and adjusting the pH to 5 by adding a sulfuric acid band was used.
These are 5 layers with a circular multi-layer paper machine, with a surface layer weight of 60 g / m ² , a middle layer (2-4 layers) weight of 460 g / m ² , and a back layer weight of 60 g / m ^2. Paper with a structure, PVA (Nippon Synthetic Chemical Co., Ltd., Gohsenol N300) is calender coated on the surface with a coating amount of 1.0 g / m ² , and on the back with 1.0 g / m ² carrier tape paper Got.

[Examples 2 to 5]
A carrier tape paper was obtained in the same manner as in Example 1 except that the amount of PVA applied on the surface of the surface layer was adjusted to the value shown in Table 1.

[Examples 6 to 12]
A carrier tape paper was obtained in the same manner as in Example 1 except that the raw material pulp content used in the middle layer was adjusted to the values shown in Table 1.

[Examples 13 to 18]
A carrier tape paper was obtained in the same manner as in Example 1 except that the freeness of the pulp slurry used for the surface layer, the back layer, and the middle layer was set to the values shown in Table 1.

[Examples 19 to 23]
A carrier tape paper was obtained in the same manner as in Example 1 except that the blending ratio of the raw material pulp used for the surface layer and the back layer was adjusted to the values shown in Table 1.

[Comparative Examples 1-2]
A carrier tape paper was obtained in the same manner as in Example 1 except that the amount of PVA applied on the surface of the surface layer was adjusted to the value shown in Table 1.

  About the above Example and the comparative example, the evaluation test was done about the physical-property measurement of a tsubo, thickness, stiffness, smoothness, surface strength, and interlayer strength, and a crease. The results are shown in Table 1. The physical property measurement and this 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.

Details of each measurement method and test method are as follows.
(thickness)
JIS P 8118 Paper and paperboard—Thickness was measured according to thickness and density test methods.

(Stiffness)
In accordance with JIS P 8125 paper and paperboard-stiffness test method-Taber stiffness tester method, the stiffness in the vertical direction was measured. In the table, (X) is the vertical stiffness when a load is applied from the front side to the back side, and (Y) is the vertical stiffness when a load is applied from the back side to the front side. It was.

(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.

(Surface strength)
Based on TAPPI T459 om-83, the surface strengths on the front and back sides were measured.

(Interlayer strength)
According to TAPPI UM522, the interlayer strength in the Z-axis direction was measured.

(Separation method of each layer)
In order to measure the physical properties of each layer of the paper after paper making, each layer was separated from the paper after paper making by the following method. First, after immersing the sample in water at room temperature for about 1 hour, the sample is rubbed on a round bar of about 10 mmΦ starting from the corner of the sample, and the round bar is rolled in this state to squeeze the sample. This operation is repeated starting from all four corners of the sample, and an ironing force is applied to the sample from each direction. As a result, part of the layer between the samples is peeled off, and this is used to separate the sample into a surface layer, a middle layer, and a back layer.

(Freeness)
Each separated layer is cut to obtain a test piece of about 3 cm ² and about 25 g. After the test piece is immersed in 1 liter of water for 24 hours, it is subjected to a disaggregation treatment for 15 minutes with a standard disintegrator based on JIS-P8220. After visually confirming that the piece was completely disaggregated, it was measured with a Canadian standard freeness tester according to JIS-P8121.

(Break)
For the evaluation of folding, ten samples having a flow direction of 30 cm and a width of 8 mm were prepared, placed on a cylinder having a diameter of 6 cm, the number of occurrences of folding was visually determined, and the average number per one was evaluated according to the following criteria. . In the evaluation, less than 1 was evaluated as ◎, 1 or more and less than 2 as ○, 2 or more and less than 5 Δ, and 5 or more as ×.

  From Table 1, it can be seen that Examples 1 to 23, which are carrier tape sheets of the present invention, are excellent in quality evaluation. On the other hand, Comparative Examples 1-2 are inferior to Examples 1-23 in quality evaluation. As a result, it can be said that the carrier tape sheet of the present invention prevents creases and wrinkles from occurring when the cassette tape or tube is scraped off or after scraping. It can be said that it is possible to obtain a carrier tape that is excellent in stable production at the time of taking out electronic components and has high production efficiency.

  The present invention relates to a carrier tape for storing chip-shaped surface-mounted electronic components and transporting them to a surface-mounting machine (mounter) and a carrier tape sheet used therefor, which are used when manufacturing an electronic circuit.

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 the electronic components to the surface mounter, the width is 6 to 9 mm including the cavity portion for storing the electronic components and the marginal portion for feeding into the surface mounter, and the base paper thickness is 0.4 to 1. A 0 mm carrier tape is used. In particular, generally those having a width of 8 mm and a thickness of 0.7 to 1.0 mm are often used.
There are paper and plastic carrier tapes. However, it is desirable that the carrier tape 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 for storing the parts and the marginal part for feeding the carrier tape are through holes, and the surface is sealed with the top cover tape in a state where the surface mount parts are stored, and the bottom surface. Is a punch carrier tape that is sealed with a bottom tape, or an embossed carrier tape whose cavity part is formed by embossing and whose surface is sealed with a top cover tape. An unpunched carrier tape or the like is known.
These carrier tapes are loaded with electronic parts in the cavity and sealed with a top cover tape, and are wound around a cassette reel having a diameter of about 5 cm (record winding method), or a paper tube having a diameter of about 20 cm and a width of about 10 cm. It is shipped in a state of being wound in a spiral shape (traverse winding), 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.
JP 2005-179797 A JP-A-3-249300 JP 2004-67222 A

However, when a conventional carrier tape is rubbed against a cassette reel or the like, the carrier tape may be bent without being bent along the outer peripheral surface of the reel or tube.
The phenomenon of folding becomes significant when the generally used paper thickness is 700 μm or more, and becomes remarkable when the cassette reel diameter is as small as 5 to 6 cm. And when a fold occurs in this way, a convex portion appears on the surface of the fold portion, and this convex portion is hooked on the guide portion of the surface mounting machine in the next process to stably load the component into the surface mounting machine. I can't. In surface mounters, the top seal is pulled from the carrier tape while pulling it at a constant tension, and the electronic components inside the cavity are taken out. However, when the carrier tape is broken, the top cover seal is peeled from the carrier tape at the folded portion. It will float. Then, the surface mounter cannot pull the top cover seal with a constant tension, and the carrier tape pulled by the surface mounter flutters, so that the electronic components in the cavity cannot be dropped off or loaded at a desired position.
SUMMARY OF THE INVENTION Accordingly, a problem to be solved by the present invention is that a carrier tape and a carrier capable of efficiently producing a multilayer paperboard having a thickness of 700 μm or more, and preventing the occurrence of folds at the time of reel winding or in the winding state. To provide tape paper.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
A multi-layered carrier tape paper having a surface layer as an outer surface of winding, a back layer as an inner surface of winding, and an intermediate layer therebetween,
The paper thickness is 700-1200 μm,
Paper stipulated in JIS-P8125 when a load is applied from the front side to the back side against the stiffness in the vertical direction of the paper stipulated in JIS-P8125 when a load is applied from the back side to the front side A carrier tape sheet characterized in that the ratio of stiffness in the vertical direction is 80 to 90%.

<Invention of Claim 2>
The surface layer and the back layer are coated or impregnated with a water-soluble polymer,
The carrier tape paper according to claim 1, wherein a mass ratio of the water-soluble high molecular weight coated or impregnated on the surface layer to the water-soluble high molecular weight coated or impregnated on the back layer is 120 to 250%.

<Invention of Claim 3>
The carrier tape paper according to claim 1 or 2, wherein 5 to 30% of mechanical pulp is contained in the intermediate layer.

<Invention of Claim 4>
The carrier tape paper according to any one of claims 1 to 3, wherein a difference in Canadian standard freeness based on JIS-P8121 between adjacent layers is 50 cc or less.

<Invention of Claim 5>
5. A carrier tape, comprising a carrier tape sheet according to any one of claims 1 to 4 having a cavity portion for storing a component to be conveyed and a marginal portion for feeding a tape.

  The carrier tape paper according to the present invention has a certain degree of integrity between the layers in the multi-layer paper making, and further, by providing an appropriate difference in stiffness between the front and back layers, Alternatively, the occurrence of folds on the side facing the take-up inner surface is greatly prevented when the tube is rubbed against the tube or in the rubbed state.

  Then, a difference in stiffness between the front and back surfaces can be suitably generated by applying and impregnating the water-soluble polymer.

  Moreover, when 5-30% of mechanical pulp is contained in the intermediate layer, the formation becomes good, and the occurrence of the folding start point due to uneven formation is prevented. Furthermore, the mechanical pulp also improves the flexibility of the intermediate layer, making it easier to exert the effect of the difference in stiffness between the front and back layers.

  Furthermore, if the difference in Canadian standard freeness (hereinafter also simply referred to as “freeness”) based on JIS-P8121 of each adjacent layer is 50 cc or less, the entanglement of fibers between adjacent layers is good, the interlayer strength is high, and the reel Occurrence of folds on the winding surface and separation between the layers when it is rubbed or the like is prevented.

  The carrier tape made of the carrier tape sheet of the present invention has advantages such as being extremely difficult to bend, and the top tape can be stably peeled off. Contributes to improvement.

Embodiments of the present invention will be described in detail below with specific examples.
The carrier tape paper of the present invention may be a paper having a surface layer, an intermediate layer, and a back layer manufactured by multilayer papermaking, and is not limited to a three-layer structure, but a multilayer of four or more layers having a plurality of intermediate layers. It may be a structure. 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 material of each layer can be made freely. For example, it is easy to use virgin pulp for the front and back layers while blending the used paper pulp in the intermediate layer, and contribute to recycling. There is an advantage that it is easy to achieve quality assurance while using.

  Here, as the raw material pulp used for each layer of the carrier tape paper according to the present invention, for example, hardwood bleached kraft pulp (LBKP), softwood bleached kraft pulp (NBKP), hardwood unbleached kraft pulp (LUKP), softwood unbleached kraft Pulp (NUKP), hardwood semi-bleached kraft pulp (LSBKP), softwood semi-bleached kraft pulp (NSBKP), hardwood sulfite pulp, softwood sulfite pulp, etc., chemical stone, stone grand pulp (SGP), pressurized stone grand pulp (PGW) , Refiner Grand Pulp (RGP), Thermomechanical Pulp (TMP), Chemi-Grand Pulp (CGP), Ground Pulp (GP), Thermomechanical Pulp (TMP), etc. Mechanical Pulp, Tea Waste Paper, Craft Envelope Waste Paper, Magazine Waste Paper, Newspaper Waste paper, flyer waste paper, off Waste paper, corrugated waste paper, Koji white waste paper, Kent waste paper, imitation waste paper, waste paper waste paper, etc. One or several kinds of known various pulps such as pulps chemically or mechanically produced from non-wood fibers such as straw 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 necessary for carrier tape paper, a good texture can be obtained and the adhesiveness to the top seal tape becomes better, and the top seal A stable peel-off strength can be obtained when the tape is peeled off. In addition, 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, the adhesiveness with the top seal tape tends to vary, and the top seal tape is peeled off. In some cases, 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 the rigidity are lowered, and when the top seal tape is peeled off, fluffing and paper dust are generated, which causes a decrease in production efficiency.

  In particular, in the intermediate layer, mechanical pulp is suitable for achieving its role, contribution to recycling, various quality characteristics, etc. in a balanced and efficient manner. As the mechanical pulp, groundwood pulp (GP), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), pressured groundwood pulp (PGW), or the like can be used. Among these mechanical pulps, thermomechanical pulp (TMP) and pressured ground wood pulp (PGW) that generate less binding fibers and paper dust are preferable.

  Further, the content of mechanical pulp 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. When the blending amount is large, the strength is lowered, and there is a concern about generation of paper dust from the cross section or delamination in the intermediate layer, so 30% or less is preferable. In addition, the mechanical pulp amount of the intermediate layer after papermaking can be specified by “Paper, paperboard and pulp fiber composition test method” described in JIS-P8120.

  On the other hand, when the intermediate layer contains mechanical pulp, waste paper pulp can be used as a raw material for the intermediate layer. Used paper pulp includes tea waste paper, kraft envelope waste paper, magazine waste paper, newspaper waste paper, flyer waste paper, office waste paper, corrugated waste paper, Kamihaku waste paper, Kent waste paper, imitation waste paper, and old paper waste paper, etc.・ Deinked waste paper pulp or disaggregation / deinking / bleached waste paper pulp can be used. Among these waste paper pulps, especially as the raw material of the intermediate layer, in order to obtain various quality characteristics as carrier tape paper in a balanced and efficient manner, the surface strength, rigidity, tensile strength, interlayer strength, etc. are high, and the machine It is preferable to use waste paper pulp produced from office waste paper, tea waste paper, and craft envelope waste paper that contains pulp and has excellent cushioning properties.

On the other hand, the carrier tape sheet of the present invention desirably has a difference in freeness between adjacent layers of 50 cc or less. When the difference exceeds 50 cc, the entanglement between the pulp fibers in adjacent layers becomes weak, and peeling occurs between the layers due to the bending and ironing force applied when the core is wound or wound back by a core having a diameter of about 50 mm. travel of the carrier tape when it is peeled off the top seal tape Ji live may not be stable.

  The freeness of each layer according to the present invention is a value measured by separating the carrier tape paper into each layer and then performing disaggregation processing based on JIS-P8220. However, this value is almost the same as the freeness of the raw pulp slurry. Here, as a method for separating each layer, the carrier tape sheet is immersed in water, and then the delamination is performed by applying a squeezing force. Other layers other than the measurement layer may be scraped off, and the point is not particularly limited as long as each layer can be separated from the other layers.

  Furthermore, the freeness of the raw material pulp used for each layer is preferably 300 to 500 cc, and more preferably 350 to 450 cc. That is, if the freeness is less than 300 cc, the fiber length is shortened, so there is a high risk of bending when the carrier tape is used, and if the freeness exceeds 500 cc, the surface strength and stiffness of the paper tends to decrease. Paper dust is likely to be generated, and it becomes inferior in processability as a carrier tape.

Incidentally, the pulp or pulp slurry definitive to the present invention may be added as required inner添薬products. 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, Examples include foaming agents, basic dyes, acid dyes, anionic direct dyes, and cationic direct dyes.

  On the other hand, the carrier tape paper of the present invention applied a load from the front surface side to the back surface side against the stiffness in the paper vertical direction defined in JIS-P8125 when a load was applied from the back surface side to the front surface side. The ratio of stiffness in the vertical direction of the paper defined in JIS-P8125 is 80 to 90%. Preferably it is 82 to 88%. If the ratio exceeds 90%, the carrier tape may fold on the surface of the carrier tape when it is scraped on a cassette reel or tube having a diameter of about 5 cm after being used as a carrier tape or when it is used after being rolled back. When the ratio is less than 80%, the rigidity when the carrier tape is used is insufficient, and the bending of the carrier tape causes bending on the back surface of the carrier tape against the bending and ironing force. Breaks and wrinkles will occur. Here, the stiffness in the longitudinal direction of the paper as defined in JIS-P8125 when a load is applied from the front side to the back side is 78 mN · m or more, preferably 85 mN · m or more and less than 140 mN · m. Is desirable. Further, the stiffness in the vertical direction of the paper as defined in JIS-P8125 when a load is applied from the back side to the front side is 87 mN · m or more, preferably 95 mN · m or more and less than 155 mN · m. Is desirable.

  When measuring a test piece with a width of 8 mm, the stiffness in the vertical direction of the paper defined in JIS-P8125 when a load is applied from the front side to the back side is 16 mN · m or more, preferably 17 mN. -It is desirable to set it to m or more, and when the load is applied from the back side to the front side, the stiffness in the paper vertical direction defined in JIS-P8125 is 18 mN · m or more, preferably 20 mN · m or more. Is desirable.

In order to make the stiffness of the carrier tape paper within the scope of the present invention, it is simple and suitable to achieve by applying or impregnating a water-soluble polymer to the surface layer and the back surface layer. In this case, the mass ratio of the water-soluble high molecular weight coated or impregnated on the back surface layer to the water-soluble high molecular weight coated or impregnated on the surface layer is preferably 120 to 250%. As the water-soluble polymer to be coated or impregnated on the surface layer and the back layer, one or more water-soluble polymers from starch, polyvinyl alcohol (PVA), polyacrylamide (PAM), etc. should be used. Can do. Among these, it is preferable to use polyvinyl alcohol (PVA) from the viewpoints of surface strength, adhesion to the top cover tape, heat resistance, and the like.

The coating or impregnation amount on the surface layer is preferably 1.5 to 4.0 g / m ² in terms of solid content. More preferably, it is 1.5-2.5 g / m < ² >. If the coating / impregnation amount of the water-soluble polymer is less than 1.5 g / m ² , the surface layer side to the back layer side against the stiffness when a load is applied from the back layer side to the surface layer side of the paper It becomes difficult to make the ratio of stiffness when applying a load toward 80 to 90%. On the other hand, if it exceeds 4.0 g / m ² , the drying property after coating and impregnation is deteriorated, the productivity is lowered and soiling in the subsequent step is caused. Although there is a method of internally adding a water-soluble polymer to each of the front and back layers, it is preferable to externally add from the viewpoint of cost and operability.

In particular, the coating / impregnation amount for the back layer is preferably 0.5 to 2.0 g / m ² in terms of solid content. More preferably, it is 0.5-1.5 g / m < ² >. If the coating / impregnation amount on the back layer is less than 0.5 g / m ² , the surface strength and interlayer strength of the carrier tape may be insufficient. When it exceeds 2.0 g / m ² , it becomes difficult to set the stiffness ratio within the above range (80 to 90%). Moreover, the drying property after coating and impregnation is deteriorated, the productivity is lowered, and dirt may be produced in the subsequent process.

  The coating apparatus used for coating / impregnating the water-soluble polymer on the surface layer and the back layer is not particularly limited. For example, air knife coater, blade coater, rod coater, bar coater, gate roll coater, size press A roll coater such as velvapa coater, calendar coating and the like can be used as appropriate.

  In order to reduce the amount of coating / impregnation to the back layer to less than the amount of coating / impregnation to the front layer, for example, change the concentration of water-soluble polymer in the coating solution to be coated / impregnated on the front and back layers. It may be provided or the number of coatings for each layer may be made different. For example, it may be applied to the surface layer twice by a calender coating machine and once to the back layer.

  After coating and impregnating the water-soluble polymer, the front and back surfaces can be smoothed by 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, or the like is used as appropriate. Surface smoothing treatment is smoothness when the backing of the clamping device is measured as 1.0 MPA using soft backing in accordance with JIS P 8151 print surf tester method (area type flow meter type print surf tester). Is preferably 5.0 to 8.0 μm.

  Furthermore, in the carrier tape paper of the present invention, the surface strength of the surface layer measured according to TAPPI T459 om-83 is preferably 12A or more, and more preferably 14A. In order to make the surface strength 12A or more, it can be achieved by a method such as coating / impregnation with a raw material blending ratio, a raw pulp slurry's threeness, 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 topper cover tape, and it becomes paper dust and deteriorates operability. Cause it.

  The carrier tape paper described in detail above is cut into a medium thickness 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 or embossing to be conveyed. A cavity portion for storing components, a marginal portion for tape feeding, and the like are formed to obtain the carrier tape of the present invention.

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, unless otherwise noted, "parts" and "%" respectively mean "parts by weight" and "% by mass", and "kg / t" per Paruputon Means amount (kg).

[Example 1]
For the surface layer and the back layer, sizing agent (R50 manufactured by Modern Chemical Industry Co., Ltd.) is added to the pulp slurry of 420 ml freeness consisting of 15% softwood bleached kraft pulp (NBKP) and 85% hardwood bleached kraft pulp (LBKP). A raw material in which 0.25% in terms of conversion and 0.15% in terms of solid content of PAM (manufactured by Harima Kasei Co., Ltd., Hermide B-15) was internally added, and a pH adjusted to 5 by adding a sulfuric acid band was used.
On the other hand, as an intermediate layer (2-4 layers), a sizing agent (R50 manufactured by Modern Chemical Industry Co., Ltd.) is added to a pulp slurry of 410 ml of freeness composed of NBKP 50%, LBKP 40%, and thermomechanical pulp (TMP) 10%. A raw material having 0.30% in terms of conversion and 0.5% PAM (Harmide B-15, manufactured by Harima Kasei Co., Ltd.) in terms of solid content and adjusting the pH to 5 by adding a sulfuric acid band was used.
At these round net multilayer paper machine, with the amount of 60 g / m ² of the surface layer, 460 g / m ² Paste amount of the intermediate layer (2-4 layers), Paste amount of the back layer as a 60 g / m ^2, A sheet of paper with a five-layer structure, PVA (manufactured by Nippon Synthetic Chemical Co., Ltd., Gohsenol N300) is calendered and coated on the surface with a coating amount of 1.0 g / m ² and on the back surface with 1.0 g / m ^2. Tape paper was obtained.

[Examples 2 to 5]
A carrier tape paper was obtained in the same manner as in Example 1 except that the amount of PVA applied to the surface layer surface was adjusted to the values shown in Table 1.

[Examples 6 to 12]
A carrier tape paper was obtained in the same manner as in Example 1 except that the raw material pulp content used in the intermediate layer was adjusted to the values shown in Table 1.

[Examples 13 to 18]
A carrier tape paper was obtained in the same manner as in Example 1 except that the freeness of the pulp slurry used for the front surface layer , the back surface layer , and the intermediate layer was set to the values shown in Table 1.

[Examples 19 to 23]
A carrier tape paper was obtained in the same manner as in Example 1 except that the blending ratio of the raw material pulp used for the surface layer and the back surface layer was adjusted to the values shown in Table 1.

[Comparative Examples 1-2]
A carrier tape paper was obtained in the same manner as in Example 1 except that the amount of PVA applied to the surface layer surface was adjusted to the values shown in Table 1.

  About the above Example and the comparative example, the evaluation test was done about the physical-property measurement of a tsubo, thickness, stiffness, smoothness, surface strength, and interlayer strength, and a crease. The results are shown in Table 1. The physical property measurement and this 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.

Details of each measurement method and test method are as follows.
(thickness)
JIS P 8118 Paper and paperboard—Thickness was measured according to thickness and density test methods.

(Stiffness)
In accordance with JIS P 8125 paper and paperboard-stiffness test method-Taber stiffness tester method, the stiffness in the vertical direction was measured. In the table, (X) is the vertical stiffness when a load is applied from the front side to the back side, and (Y) is the vertical stiffness when a load is applied from the back side to the front side. It was.

(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.

(Surface strength)
Based on TAPPI T459 om-83, the surface strengths on the front and back sides were measured.

(Interlayer strength)
According to TAPPI UM522, the interlayer strength in the Z-axis direction was measured.

(Separation method of each layer)
In order to measure the physical properties of each layer of the paper after paper making, each layer was separated from the paper after paper making by the following method. First, after immersing the sample in water at room temperature for about 1 hour, the sample is rubbed on a round bar of about 10 mmΦ starting from the corner of the sample, and the round bar is rolled in this state to squeeze the sample. This operation is repeated starting from all four corners of the sample, and an ironing force is applied to the sample from each direction. As a result, a part of the layer between the samples is peeled off, and this is used to separate the sample into a front surface layer , an intermediate layer , and a back surface layer .

(Freeness)
Each separated layer is cut to obtain a test piece of about 3 cm ² and about 25 g. After the test piece is immersed in 1 liter of water for 24 hours, it is subjected to a disaggregation treatment for 15 minutes with a standard disintegrator based on JIS-P8220. After visually confirming that the piece was completely disaggregated, it was measured with a Canadian standard freeness tester according to JIS-P8121.

(Break)
For the evaluation of folding, ten samples having a flow direction of 30 cm and a width of 8 mm were prepared, placed on a cylinder having a diameter of 6 cm, the number of occurrences of folding was visually determined, and the average number per one was evaluated according to the following criteria. . In the evaluation, less than 1 was evaluated as ◎, 1 or more and less than 2 as ○, 2 or more and less than 5 Δ, and 5 or more as ×.

From Table 1, it can be seen that Examples 1 to 23, which are carrier tape sheets of the present invention, are excellent in quality evaluation. On the other hand, Comparative Examples 1-2 are inferior to Examples 1-23 in quality evaluation. As a result, it can be said that the carrier tape sheet of the present invention prevents creases and wrinkles from occurring when the cassette tape or tube is scraped off or after scraping. It can be said that it is possible to obtain a carrier tape that is excellent in stability at the time of taking out an electronic component and has high production efficiency.

  The present invention relates to a carrier tape for storing chip-shaped surface-mounted electronic components and transporting them to a surface-mounting machine (mounter) and a carrier tape sheet used therefor, which are used when manufacturing an electronic circuit.

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 the electronic components to the surface mounter, the width is 6 to 9 mm including the cavity portion for storing the electronic components and the marginal portion for feeding into the surface mounter, and the base paper thickness is 0.4 to 1. A 0 mm carrier tape is used. In particular, generally those having a width of 8 mm and a thickness of 0.7 to 1.0 mm are often used.
There are paper and plastic carrier tapes. However, it is desirable that the carrier tape 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 with the top cover tape in the state where the surface mount component is stored, and the bottom surface. Is a punch carrier tape that is sealed with a bottom tape, or an embossed carrier tape whose cavity part is formed by embossing and whose surface is sealed with a top cover tape. An unpunched carrier tape or the like is known.
These carrier tapes are loaded with electronic parts in the cavity and sealed with a top cover tape, and are wound around a cassette reel having a diameter of about 5 cm (record winding method), or a paper tube having a diameter of about 20 cm and a width of about 10 cm. It is shipped in a state of being wound in a spiral shape (traverse winding), 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.
JP 2005-179797 A JP-A-3-249300 JP 2004-67222 A

However, when a conventional carrier tape is rubbed against a cassette reel or the like, the carrier tape may be bent without being bent along the outer peripheral surface of the reel or tube.
The phenomenon of folding becomes significant when the generally used paper thickness is 700 μm or more, and becomes remarkable when the cassette reel diameter is as small as 5 to 6 cm. And when a fold occurs in this way, a convex portion appears on the surface of the fold portion, and this convex portion is hooked on the guide portion of the surface mounting machine in the next process to stably load the component into the surface mounting machine. I can't. In surface mounters, the top seal is pulled from the carrier tape while pulling it at a constant tension, and the electronic components inside the cavity are taken out. However, when the carrier tape is broken, the top cover seal is peeled from the carrier tape at the folded portion. It will float. As a result, the surface mounter cannot pull the top cover seal with a constant tension, and the carrier tape pulled by the surface mounter flutters, and the electronic components in the cavity cannot be detached or loaded at a desired position.
SUMMARY OF THE INVENTION Accordingly, a problem to be solved by the present invention is that a carrier tape and a carrier capable of efficiently producing a multilayer paperboard having a thickness of 700 μm or more, and preventing the occurrence of folds at the time of reel winding or in the winding state. To provide tape paper.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
A multi-layered carrier tape paper having a surface layer as an outer surface of winding, a back layer as an inner surface of winding, and an intermediate layer therebetween,
The paper thickness is 700-1200 μm,
The surface layer and the back layer are coated or impregnated with a water-soluble polymer,
The weight ratio of the water-soluble polymer coated or impregnated on the surface layer to the water-soluble polymer coated or impregnated on the back layer is 120 to 250%, and a load is applied from the back side to the surface side. The ratio of the vertical stiffness of the paper defined in JIS-P8125 when a load is applied from the front side to the back side with respect to the vertical stiffness of the paper defined in JIS-P8125 when applied is 82 to Carrier tape paper characterized by 88%.

<Invention of Claim 2>
The carrier tape paper according to claim 1, wherein the intermediate layer contains 5 to 30% of mechanical pulp.

<Invention of Claim 3>
The carrier tape paper according to claim 1 or 2, wherein a difference in Canadian standard freeness based on JIS-P8121 between adjacent layers is 50 cc or less.

<Invention of Claim 4>
4. A carrier tape, comprising: a carrier tape storage cavity part and a tape feeding marginal part formed on the carrier tape sheet according to claim 1;

  The carrier tape paper according to the present invention has a certain degree of integrity between the layers in the multi-layer paper making, and further, by providing an appropriate difference in stiffness between the front and back layers, Alternatively, the occurrence of folds on the side facing the take-up inner surface is greatly prevented when the tube is rubbed against the tube or in the rubbed state.

  Then, a difference in stiffness between the front and back surfaces can be suitably generated by applying and impregnating the water-soluble polymer.

  Moreover, when 5-30% of mechanical pulp is contained in the intermediate layer, the formation becomes good, and the occurrence of the folding start point due to uneven formation is prevented. Furthermore, the mechanical pulp also improves the flexibility of the intermediate layer, making it easier to exert the effect of the difference in stiffness between the front and back layers.

  Furthermore, if the difference in Canadian standard freeness (hereinafter also simply referred to as “freeness”) based on JIS-P8121 of each adjacent layer is 50 cc or less, the entanglement of fibers between adjacent layers is good, the interlayer strength is high, and the reel Occurrence of folds on the winding surface and separation between the layers when it is rubbed or the like is prevented.

  The carrier tape made of the carrier tape sheet of the present invention has advantages such as being extremely difficult to bend, and the top tape can be stably peeled off. Contributes to improvement.

Embodiments of the present invention will be described in detail below with specific examples.
The carrier tape paper of the present invention may be a paper having a surface layer, an intermediate layer, and a back layer manufactured by multilayer papermaking, and is not limited to a three-layer structure, but a multilayer of four or more layers having a plurality of intermediate layers. It may be a structure. 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 material of each layer can be made freely. For example, it is easy to use virgin pulp for the front and back layers while blending the used paper pulp in the intermediate layer, and contribute to recycling. There is an advantage that it is easy to achieve quality assurance while using.

  Here, as the raw material pulp used for each layer of the carrier tape paper according to the present invention, for example, hardwood bleached kraft pulp (LBKP), softwood bleached kraft pulp (NBKP), hardwood unbleached kraft pulp (LUKP), softwood unbleached kraft Pulp (NUKP), hardwood semi-bleached kraft pulp (LSBKP), softwood semi-bleached kraft pulp (NSBKP), hardwood sulfite pulp, softwood sulfite pulp, etc., chemical stone, stone grand pulp (SGP), pressurized stone grand pulp (PGW) , Refiner Grand Pulp (RGP), Thermomechanical Pulp (TMP), Chemi-Grand Pulp (CGP), Ground Pulp (GP), Thermomechanical Pulp (TMP), etc. Mechanical Pulp, Tea Waste Paper, Craft Envelope Waste Paper, Magazine Waste Paper, Newspaper Waste paper, flyer waste paper, off Waste paper, corrugated waste paper, Koji white waste paper, Kent waste paper, imitation waste paper, waste paper waste paper, etc. One or several kinds of known various pulps such as pulps chemically or mechanically produced from non-wood fibers such as straw 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 necessary for carrier tape paper, a good texture can be obtained and the adhesiveness to the top seal tape becomes better, and the top seal A stable peel-off strength can be obtained when the tape is peeled off. In addition, 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, the adhesiveness with the top seal tape tends to vary, and the top seal tape is peeled off. In some cases, 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 the rigidity are lowered, and when the top seal tape is peeled off, fluffing and paper dust are generated, which causes a decrease in production efficiency.

  In particular, in the intermediate layer, mechanical pulp is suitable for achieving its role, contribution to recycling, various quality characteristics, etc. in a balanced and efficient manner. As the mechanical pulp, grandwood pulp (GP), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), pressured groundwood pulp (PGW), or the like can be used. Among these mechanical pulps, thermomechanical pulp (TMP) and pressured ground wood pulp (PGW) that generate less binding fibers and paper dust are preferable.

  Further, the content of mechanical pulp 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. When the blending amount is large, the strength is lowered, and there is a concern about generation of paper dust from the cross section or delamination in the intermediate layer, so 30% or less is preferable. In addition, the mechanical pulp amount of the intermediate layer after papermaking can be specified by “Paper, paperboard and pulp fiber composition test method” described in JIS-P8120.

  On the other hand, when the intermediate layer contains mechanical pulp, waste paper pulp can be used as a raw material for the intermediate layer. Used paper pulp includes tea waste paper, kraft envelope waste paper, magazine waste paper, newspaper waste paper, flyer waste paper, office waste paper, corrugated waste paper, Kamihaku waste paper, Kent waste paper, imitation waste paper, and old paper waste paper, etc.・ Deinked waste paper pulp or disaggregation / deinking / bleached waste paper pulp can be used. Among these waste paper pulps, especially as the raw material of the intermediate layer, in order to obtain various quality characteristics as carrier tape paper in a balanced and efficient manner, the surface strength, rigidity, tensile strength, interlayer strength, etc. are high, and the machine It is preferable to use waste paper pulp produced from office waste paper, tea waste paper, and craft envelope waste paper that contains pulp and has excellent cushioning properties.

  On the other hand, the carrier tape sheet of the present invention desirably has a difference in freeness between adjacent layers of 50 cc or less. When the difference exceeds 50 cc, the entanglement between the pulp fibers in adjacent layers becomes weak, and peeling occurs between the layers due to the bending and ironing force applied when the core is wound or wound back by a core having a diameter of about 50 mm. When the top seal tape is peeled off, the running of the carrier tape may not be stable.

  The freeness of each layer according to the present invention is a value measured by separating the carrier tape paper into each layer and then performing disaggregation processing based on JIS-P8220. However, this value is almost the same as the freeness of the raw pulp slurry. Here, as a method for separating each layer, the carrier tape sheet is immersed in water, and then the delamination is performed by applying a squeezing force. Other layers other than the measurement layer may be scraped off, and the point is not particularly limited as long as each layer can be separated from the other layers.

  Furthermore, the freeness of the raw material pulp used for each layer is preferably 300 to 500 cc, and more preferably 350 to 450 cc. That is, if the freeness is less than 300 cc, the fiber length is shortened, so there is a high risk of bending when the carrier tape is used, and if the freeness exceeds 500 cc, the surface strength and stiffness of the paper tends to decrease. Paper dust is likely to be generated, and it becomes inferior in processability as a carrier tape.

  In addition, an internal additive chemical | medical agent can be added to the raw material pulp or pulp slurry in this invention as needed. 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, Examples include foaming agents, basic dyes, acid dyes, anionic direct dyes, and cationic direct dyes.

  On the other hand, the carrier tape paper of the present invention applied a load from the front surface side to the back surface side against the stiffness in the paper vertical direction defined in JIS-P8125 when a load was applied from the back surface side to the front surface side. The ratio of stiffness in the vertical direction of the paper defined in JIS-P8125 is 80 to 90%. Preferably it is 82 to 88%. If the ratio exceeds 90%, the carrier tape may fold on the surface of the carrier tape when it is scraped on a cassette reel or tube having a diameter of about 5 cm after being used as a carrier tape or when it is used after being rolled back. When the ratio is less than 80%, the rigidity when the carrier tape is used is insufficient, and the bending of the carrier tape causes bending on the back surface of the carrier tape against the bending and ironing force. Breaks and wrinkles will occur. Here, the stiffness in the longitudinal direction of the paper as defined in JIS-P8125 when a load is applied from the front side to the back side is 78 mN · m or more, preferably 85 mN · m or more and less than 140 mN · m. Is desirable. Further, the stiffness in the vertical direction of the paper as defined in JIS-P8125 when a load is applied from the back side to the front side is 87 mN · m or more, preferably 95 mN · m or more and less than 155 mN · m. Is desirable.

  When measuring a test piece with a width of 8 mm, the stiffness in the vertical direction of the paper defined in JIS-P8125 when a load is applied from the front side to the back side is 16 mN · m or more, preferably 17 mN. -It is desirable to set it to m or more, and when the load is applied from the back side to the front side, the stiffness in the paper vertical direction defined in JIS-P8125 is 18 mN · m or more, preferably 20 mN · m or more. Is desirable.

  In order to make the stiffness of the carrier tape paper within the scope of the present invention, it is simple and suitable to achieve by applying or impregnating a water-soluble polymer to the surface layer and the back surface layer. In this case, the mass ratio of the water-soluble high molecular weight coated or impregnated on the back surface layer to the water-soluble high molecular weight coated or impregnated on the surface layer is preferably 120 to 250%. As the water-soluble polymer to be coated or impregnated on the surface layer and the back layer, one or more water-soluble polymers from starch, polyvinyl alcohol (PVA), polyacrylamide (PAM), etc. should be used. Can do. Among these, it is preferable to use polyvinyl alcohol (PVA) from the viewpoints of surface strength, adhesion to the top cover tape, heat resistance, and the like.

The coating or impregnation amount on the surface layer is preferably 1.5 to 4.0 g / m ² in terms of solid content. More preferably, it is 1.5-2.5 g / m < ² >. If the coating / impregnation amount of the water-soluble polymer is less than 1.5 g / m ² , the surface layer side to the back layer side against the stiffness when a load is applied from the back layer side to the surface layer side of the paper It becomes difficult to make the ratio of stiffness when applying a load toward 80 to 90%. On the other hand, if it exceeds 4.0 g / m ² , the drying property after coating and impregnation is deteriorated, the productivity is lowered and soiling in the subsequent step is caused. Although there is a method of internally adding a water-soluble polymer to each of the front and back layers, it is preferable to externally add from the viewpoint of cost and operability.

In particular, the coating / impregnation amount for the back layer is preferably 0.5 to 2.0 g / m ² in terms of solid content. More preferably, it is 0.5-1.5 g / m < ² >. If the coating / impregnation amount on the back layer is less than 0.5 g / m ² , the surface strength and interlayer strength of the carrier tape may be insufficient. When it exceeds 2.0 g / m ² , it becomes difficult to set the stiffness ratio within the above range (80 to 90%). Moreover, the drying property after coating and impregnation is deteriorated, the productivity is lowered, and dirt may be produced in the subsequent process.

  The coating apparatus used for coating / impregnating the water-soluble polymer on the surface layer and the back layer is not particularly limited. For example, air knife coater, blade coater, rod coater, bar coater, gate roll coater, size press A roll coater such as velvapa coater, calendar coating and the like can be used as appropriate.

  In order to reduce the amount of coating / impregnation to the back layer to less than the amount of coating / impregnation to the front layer, for example, change the concentration of water-soluble polymer in the coating solution to be coated / impregnated on the front and back layers. It may be provided or the number of coatings for each layer may be made different. For example, it may be applied to the surface layer twice by a calender coating machine and once to the back layer.

  After coating and impregnating the water-soluble polymer, the front and back surfaces can be smoothed by 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, or the like is used as appropriate. Surface smoothing treatment is smoothness when the backing of the clamping device is measured as 1.0 MPA using soft backing in accordance with JIS P 8151 print surf tester method (area type flow meter type print surf tester). Is preferably 5.0 to 8.0 μm.

  Furthermore, in the carrier tape paper of the present invention, the surface strength of the surface layer measured according to TAPPI T459 om-83 is preferably 12A or more, and more preferably 14A. In order to make the surface strength 12A or more, it can be achieved by a method such as coating / impregnation with a raw material blending ratio, a raw pulp slurry's threeness, 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 topper cover tape, and it becomes paper dust and deteriorates operability. Cause it.

  The carrier tape paper described in detail above is cut into a medium thickness 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 or embossing to be conveyed. A cavity portion for storing components, a marginal portion for tape feeding, and the like are formed to obtain the carrier tape of the present invention.

  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, unless otherwise specified, “part” and “%” mean “part by mass” and “% by mass”, respectively, and “kg / t” means the amount per pulp ton. (Kg).

[Example 1]
For the surface layer and the back layer, sizing agent (R50 manufactured by Modern Chemical Industry Co., Ltd.) is added to the pulp slurry of 420 ml freeness consisting of 15% softwood bleached kraft pulp (NBKP) and 85% hardwood bleached kraft pulp (LBKP). A raw material in which 0.25% in terms of conversion and 0.15% in terms of solid content of PAM (manufactured by Harima Kasei Co., Ltd., Hermide B-15) was internally added, and a pH adjusted to 5 by adding a sulfuric acid band was used.
On the other hand, as an intermediate layer (2-4 layers), a sizing agent (R50 manufactured by Modern Chemical Industry Co., Ltd.) is added to a pulp slurry of 410 ml of freeness composed of NBKP 50%, LBKP 40%, and thermomechanical pulp (TMP) 10%. A raw material having 0.30% in terms of conversion and 0.5% PAM (Harmide B-15, manufactured by Harima Kasei Co., Ltd.) in terms of solid content and adjusting the pH to 5 by adding a sulfuric acid band was used.
At these round net multilayer paper machine, with the amount of 60 g / m ² of the surface layer, 460 g / m ² Paste amount of the intermediate layer (2-4 layers), Paste amount of the back layer as a 60 g / m ^2, A sheet of paper with a five-layer structure, PVA (manufactured by Nippon Synthetic Chemical Co., Ltd., GOHSENOL N300) is calendered and coated on the surface with a coating amount of 1.2 g / m ² and on the back with 1.0 g / m ^2. Tape paper was obtained.

[Examples 2 to 4]
A carrier tape paper was obtained in the same manner as in Example 1 except that the amount of PVA applied to the surface layer surface was adjusted to the values shown in Table 1.

[Examples 5 to 11]
The carrier tape paper is the same as in Example 1 except that the coating amount of PVA applied to the surface layer surface and the raw material pulp blending ratio used for the intermediate layer are adjusted to the values shown in Table 1. Obtained.

[Examples 12 to 17]
A carrier tape paper was obtained in the same manner as in Example 1 except that the freeness of the pulp slurry used for the front surface layer, the back surface layer, and the intermediate layer was set to the values shown in Table 1.

[Examples 18 to 22]
A carrier tape paper was obtained in the same manner as in Example 1 except that the blending ratio of the raw material pulp used for the surface layer and the back surface layer was adjusted to the values shown in Table 1.

[Comparative Examples 1-2]
A carrier tape paper was obtained in the same manner as in Example 1 except that the amount of PVA applied to the surface layer surface was adjusted to the values shown in Table 1.

  About the above Example and the comparative example, the evaluation test was done about the physical-property measurement of a tsubo, thickness, stiffness, smoothness, surface strength, and interlayer strength, and a crease. The results are shown in Table 1. The physical property measurement and this 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.

Details of each measurement method and test method are as follows.
(thickness)
JIS P 8118 Paper and paperboard—Thickness was measured according to thickness and density test methods.

(Stiffness)
In accordance with JIS P 8125 paper and paperboard-stiffness test method-Taber stiffness tester method, the stiffness in the vertical direction was measured. In the table, (X) is the vertical stiffness when a load is applied from the front side to the back side, and (Y) is the vertical stiffness when a load is applied from the back side to the front side. It was.

(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.

(Surface strength)
Based on TAPPI T459 om-83, the surface strengths on the front and back sides were measured.

(Interlayer strength)
According to TAPPI UM522, the interlayer strength in the Z-axis direction was measured.

(Separation method of each layer)
In order to measure the physical properties of each layer of the paper after paper making, each layer was separated from the paper after paper making by the following method. First, after immersing the sample in water at room temperature for about 1 hour, the sample is rubbed on a round bar of about 10 mmΦ starting from the corner of the sample, and the round bar is rolled in this state to squeeze the sample. This operation is repeated starting from all four corners of the sample, and an ironing force is applied to the sample from each direction. As a result, a part of the layer between the samples is peeled off, and this is used to separate the sample into a front surface layer, an intermediate layer, and a back surface layer.

(Freeness)
Each separated layer is cut to obtain a test piece of about 3 cm ² and about 25 g. After the test piece is immersed in 1 liter of water for 24 hours, it is subjected to a disaggregation treatment for 15 minutes with a standard disintegrator based on JIS-P8220. After visually confirming that the piece was completely disaggregated, it was measured with a Canadian standard freeness tester according to JIS-P8121.

(Break)
For the evaluation of folding, ten samples having a flow direction of 30 cm and a width of 8 mm were prepared, placed on a cylinder having a diameter of 6 cm, the number of occurrences of folding was visually determined, and the average number per one was evaluated according to the following criteria. . In the evaluation, less than 1 was evaluated as ◎, 1 or more and less than 2 as ○, 2 or more and less than 5 Δ, and 5 or more as ×.

  From Table 1, it can be seen that Examples 1 to 23 which are carrier tape sheets of the present invention are excellent in quality evaluation. On the other hand, Comparative Examples 1-2 are inferior to Examples 1-23 in quality evaluation. As a result, it can be said that the carrier tape sheet of the present invention prevents creases and wrinkles from occurring when the cassette tape or tube is scraped off or after scraping. It can be said that it is possible to obtain a carrier tape that is excellent in stability at the time of taking out an electronic component and has high production efficiency.

Claims (5)

A multi-layered carrier tape paper having a surface layer as an outer surface of winding, a back layer as an inner surface of winding, and an intermediate layer therebetween,
The paper thickness is 700-1200 μm,
Paper stipulated in JIS-P8125 when a load is applied from the front side to the back side against the stiffness in the vertical direction of the paper stipulated in JIS-P8125 when a load is applied from the back side to the front side A carrier tape sheet characterized in that the ratio of stiffness in the vertical direction is 80 to 90%. The surface layer and the back layer are coated or impregnated with a water-soluble polymer,
The carrier tape paper according to claim 1, wherein a mass ratio of the water-soluble high molecular weight coated or impregnated on the surface layer to the water-soluble high molecular weight coated or impregnated on the back layer surface is 120 to 250%.   The carrier tape paper according to claim 1 or 2, wherein 5 to 30% of mechanical pulp is contained in the intermediate layer.   The carrier tape paper according to any one of claims 1 to 3, wherein a difference in Canadian standard freeness based on JIS-P8121 between adjacent layers is 50 cc or less.   5. A carrier tape, comprising a carrier tape sheet according to any one of claims 1 to 4 having a cavity portion for storing a component to be conveyed and a marginal portion for feeding a tape.