JP2007055686A - Chip-like electronic component storing mount, method for manufacturing paper base material for the same, and paper base material for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper base material for a storing mount, and a storing mount in which releasing in a paper layer or releasing between paper layers can be prevented, and surface layer crimps are hardly formed when bending stress is exerted thereon. <P>SOLUTION: In the chip-like electronic component storing mount, a recessed part or a punched part for storing a chip-like electronic component is formed on a paper base material. The freeness, the water retention, the weight weighted mean fiber length and the fiber length distribution coefficient of maceration pulp obtained by maceration by a pulp maceration method specified in JIS P 8220 are within a specified range. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a chip-type electronic component storage board for storing chip-type electronic components. The present invention also relates to a chip-type electronic component storage board base material used for the chip-type electronic component storage mount and a method for manufacturing the same.

A chip-type electronic component storage mount (hereinafter abbreviated as a storage mount) is used as a carrier for chip-type electronic components, and is usually manufactured and processed by processing a storage base paper base as follows. It is what is used.
(1) The storage base paper base material is slit to a predetermined width in a tape shape.
(2) A square hole and a round hole of a predetermined size are formed in the obtained paper base tape. The square hole is a perforated portion used for housing the chip-type electronic component, and the round hole is a sprocket hole used for advancing the storage board by a predetermined distance in the component filling machine.
(3) A bottom cover tape is bonded to the back surface (bottom side) of the storage board to form the bottom surfaces of the square holes and the round holes. Instead of drilling the square holes, the paper base tape may be subjected to square embossing of a predetermined size to form a bottomed hole, and in this case, step (3) is omitted. The In order to adhere the bottom cover tape to the storage board, a method of overlapping the bottom cover tape on the back surface of the storage board and applying heat and pressure from the bottom cover tape, a so-called heat sealing method is used.
(4) Chip-type electronic components are filled into the square holes in the storage board.
(5) A top cover tape is adhered to the surface (top side) of the storage board by a heat seal method to close the square holes.
(6) The storage board to which the top cover tape is bonded is wound around a cassette reel of a predetermined size and shipped together with chip-type electronic components.
(7) The top user peels off the top cover tape from the surface of the storage board, opens a square hole, and takes out the chip-type electronic component stored therein.

  The storage board is required to be resistant to peeling in the paper layer. Further, when the storage board is made of a multi-layer paper base material, it is required that the paper board is less likely to delaminate. This is because when the separation within the paper layer or the separation between the paper layers occurs, the chip-type electronic component jumps out from the peeled portion, or cannot be stably filled or stored, resulting in trouble in taking out the chip-type electronic component. .

  Until now, as a method of preventing peeling in the paper layer or peeling between the paper layers, a method of adjusting stiffness so that the strength in the appropriate Z-axis direction (thickness direction) is obtained (see Patent Document 1), weight variation coefficient Have been adopted (see Patent Documents 2 to 4) and a method of blending linter pulp (see Patent Document 5). However, any of the methods described in Patent Documents 1 to 5 cannot sufficiently prevent the occurrence of peeling in the paper layer and / or peeling between the paper layers.

Further, in the case of the storage board, when the running direction is bent when being wound around the reel or supplied from the reel, a bending stress may be applied to form a surface flaw. When surface ridges are formed on the storage board, there is a problem that strength and surface smoothness are impaired.
JP 03-249300 A Japanese Patent Laid-Open No. 10-059471 JP 2003-285865 A JP 2003-286698 A JP 2002-46769 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a storage board and a storage board paper base material in which peeling within a paper layer or peeling between paper layers is prevented and surface layer wrinkles are hardly formed when bending stress is applied. Further, the present invention provides a method for producing a storage board paper base material capable of producing a paper base material for a storage board in which peeling within a paper layer or peeling between paper layers is prevented and surface layer wrinkles are hardly formed when bending stress is applied. .

The present invention includes the following configurations.
[1] A storage board provided with a recess or a perforated portion for storing a chip-type electronic component on a paper substrate,
The freeness of the disaggregated pulp obtained by disaggregation by the pulp disaggregation method described in JIS P 8220 is 300 to 570 ml as measured in accordance with JIS P 8121. JAPAN TAPPI No. The water retention measured according to No. 26 is 100 to 135%, and JAPAN TAPPI No. The weight-weighted average fiber length measured by the pulp fiber length test method in the optical automatic measurement method defined in 52 is 1.30 to 2.0 mm, and the fiber length distribution coefficient is 2.50 to 4.50. The storage mount characterized by being.
[2] A storage base paper base material comprising: a step of adding a first polyacrylamide and a second polyacrylamide to a pulp slurry to prepare a pulp composition slurry; and a step of making the pulp composition slurry. A manufacturing method comprising:
As a pulp slurry, a blend of the following pulps (a) to (c) is used:
As the first polyacrylamide, an amphoteric one having a mass average molecular weight of 1,000,000 to 4,000,000 is used, and the total addition amount of the first polyacrylamide is 100% by mass of the total pulp. 0.1 to 2.0 mass%,
As the second polyacrylamide, one having a mass average molecular weight of 5 million to 12 million is used, and the total addition amount of the second polyacrylamide is 0.01 to 0 when the total amount of all pulp is 100 mass%. A method for producing a base paper substrate for storage paper, wherein the content is 1% by mass.
(A): Pulp having a weight-weighted average fiber length of 0.80 to 1.40 mm and a fiber length distribution coefficient of 2.0 to 4.0: 35 to 95% by mass
(B): Pulp having a weight-weighted average fiber length of 1.80 to 3.40 mm and a fiber length distribution coefficient of 2.8 to 7.0: 5 to 50% by mass
(C): Pulp other than (a) and (b): 0 to 60% by mass
[3] In the step of making the pulp composition slurry, the pulp composition slurry is filled into a plurality of containers, and the pulp composition slurry is discharged from each container to make a multilayer paper making [2]. A method for manufacturing a base paper substrate.
[4] A paper substrate produced by the method for producing a storage board paper substrate according to [2] or [3].
[5] A storage board, wherein the paper base according to [4] is provided with a recess or a perforated portion for storing the chip-type electronic component.

In the storage board and the storage base paper base of the present invention, peeling within the paper layer or peeling between the paper layers is prevented, and the surface wrinkles are not easily formed when bending stress is applied.
The method for producing a storage board base material of the present invention can produce a paper base material for a storage board in which peeling within a paper layer or peeling between paper layers is prevented and surface layer wrinkles are not easily formed when bending stress is applied. .

(Storage mount)
In the storage board of the present invention, a paper substrate is provided with a recess or a perforation for storing a chip-type electronic component.

The shape of the concave portion or the perforated portion provided on the storage board is appropriately selected depending on the shape and size of the chip-type electronic component to be stored. Specific examples of the shape of the concave portion include a cylindrical shape, a quadrangular prism shape, a hemispherical shape, and the like formed by the inner surface of the concave portion and the opening. Specific examples of the shape of the perforated part include a circular shape, a quadrangular shape, and the like in which the cross-sectional shape in a direction orthogonal to the forming direction of the perforated part is used.
Examples of the method of providing the concave portion include a method of embossing a paper substrate with a press embossing roll. Examples of the method for providing the perforating part include a method of perforating a paper base with a perforator.

The storage board has a freeness of 300 to 570 ml, preferably 350 to 450 ml according to JIS P 8121 of the disaggregated pulp (hereinafter referred to as disaggregated pulp) obtained by disaggregation by the pulp disaggregation method described in JIS P 8220. is there.
When the freeness of the disaggregated pulp is less than 300 ml, the storage board easily peels in the paper layer or peels between the paper layers. This is because when a paper base having a freeness of less than 300 ml, that is, a low freeness is made, a portion having an excessive amount of water is generated in the paper base, and the water in the portion is evaporated in a drying zone such as a dryer. This is because voids are formed in the paper base material and interfiber bonding is inhibited.
Moreover, when the freeness of the disaggregated pulp exceeds 570 ml, it becomes impossible to uniformly disperse the stress when bent by a pass line or the like, and wrinkles are likely to occur on the surface layer of the storage board. This is because when a paper base material having a freeness of disaggregated pulp of more than 570 ml is made, the aggregated flocs of fibers become too large, resulting in poor texture.

JAPAN TAPPI No. of disaggregated pulp on storage board The water retention specified in H.26 is 100 to 135%.
When the water retention of the disaggregated pulp is less than 100%, the storage board easily peels in the paper layer or peels between the paper layers. This is because if the water retention of the disaggregated pulp is less than 100%, the fiber lacks flexibility, and the bonding area between the fibers becomes small when squeezing with a press or the like when paper base is made.
Further, when the water retention of the disaggregated pulp exceeds 135%, the storage board is easily peeled in the paper layer or peeled between the paper layers. This is because when a paper base material having a water retention of 135% or more is produced, an excessive amount of water is generated in the paper base material, and when the water in the part is evaporated in a drying zone such as a dryer, This is because voids are formed in the substrate and interfiber bonding is inhibited.
The water retention is adjusted by selectively using pulp. For example, the water retention can be set low by using waste paper pulp and / or pulp having a low fiber length distribution coefficient.

The weight-weighted average fiber length of the disintegrated pulp in the storage board is 1.30 to 2.0 mm.
When the weight-weighted average fiber length of the disaggregated pulp is less than 1.30 mm, the bonding area between the fibers is small and the strength is insufficient, so that the storage board is easily peeled in the paper layer or the paper layer.
On the other hand, when the weight-weighted average fiber length of the disaggregated pulp exceeds 2.0 mm, the number of long fibers increases and the texture deteriorates, so that surface wrinkles easily occur due to bending stress.

The fiber length distribution coefficient of the disaggregated pulp in the storage board is 2.50 to 4.50, and preferably 3.20 to 4.50. When the fiber length distribution coefficient of the separated pulp is less than 2.5, the number of long fibers that strengthen the bond in the paper layer and the bond between the paper layers decreases, and the strength in the paper layer and the strength between the paper layers are difficult to be expressed. Peeling within the paper layer or peeling between the paper layers is facilitated.
On the other hand, when the fiber length distribution coefficient of the disaggregated pulp exceeds 4.5, the number of long fibers and fine fibers increases and the texture deteriorates, so that surface wrinkles easily occur due to bending stress.

  The freeness, water retention, weight-weighted average fiber length, and fiber length distribution coefficient of the disaggregated pulp of the above storage board are the freeness, water retention, and weight-weighted average fiber of the pulp used in the production of the paper base material. It does not necessarily match the length and fiber length distribution coefficient. This is because various fine fibers are removed in the wire part, press part, and drying process so that part of the fine fibers can be removed from the wire mesh or net when the paper base material is produced, and the separation within the paper layer or the separation between the paper layers is improved. This is because an internal additive is added to adjust the size and / or shape of flocs formed between pulp fibers.

The basis weight of the storage board is appropriately selected according to the size of the chip-type electronic component to be stored, but is preferably about 200 to 1000 g / m ² . If the basis weight of the storage mount is 200 g / m ² or more, the strength of the storage mount can be sufficiently secured, and if it is 1000 g / m ² or less, the manufacture of the storage mount is simplified.

The front surface and / or the back surface of the storage board is preferably coated with a covering material because the adhesion to the bottom cover tape and the top cover tape and the anti-feathering effect are improved. Examples of the covering material include starch, polyacrylamide, acrylic resin, styrene-butadiene resin, styrene-isoprene resin, polyester resin, ethylene-vinyl acetate resin, vinyl acetate-vinyl alcohol resin, urethane resin. Etc.
Examples of the coating method of the coating material include a method of applying a liquid coating material. Examples of the coating method applied in this case include a bar coater, a blade coater, an air knife coater, a rod coater, a gate roll coater, a roll coater such as a size press and a calendar coater, a bill blade coater, and a bellbapa coater. .

  The storage board of the present invention has the freeness, water retention, weight-weighted average fiber length, and fiber length distribution coefficient of the disaggregated pulp within a specific range, so that separation within the paper layer or separation between the paper layers is prevented and bending is performed. When the stress is applied, the surface flaws are not easily formed.

  For example, a storage mount paper manufactured by a method for manufacturing a storage base paper base to be described later is a storage base having the freeness, water retention, weight-weighted average fiber length, and fiber length distribution coefficient of the disaggregated pulp within the specific range. It is obtained by using a substrate.

(Manufacturing method of storage base paper base material)
The method for producing a storage board paper base material (hereinafter abbreviated as a paper base material) of the present invention is a step of preparing a pulp composition slurry by adding a first polyacrylamide and a second polyacrylamide to a pulp slurry ( Hereinafter, it is a method having a first step) and a step of making the pulp composition slurry (hereinafter referred to as a second step).

The pulp slurry used in the first step is a blend of the following pulps (a) to (c).
(A): Pulp having a weight-weighted average fiber length of 0.80 to 1.40 mm and a fiber length distribution coefficient of 2.0 to 4.0: 35 to 95% by mass
(B): Pulp having a weight-weighted average fiber length of 1.80 to 3.40 mm and a fiber length distribution coefficient of 2.8 to 7.0: 5 to 50% by mass
(C): Pulp other than (a) and (b): 0 to 60% by mass

Here, the fiber length distribution coefficient is a numerical value obtained by dividing the weight weighted average fiber length (W) by the number average fiber length (M), and is a value obtained by the following equation.
Fiber length distribution coefficient = weight-weighted average fiber length (W) / number average fiber length (M)
A larger fiber length distribution coefficient indicates a larger fiber length distribution width, and a smaller fiber length distribution coefficient indicates a smaller fiber length distribution width.
The weight-weighted average fiber length and the number average fiber length are those of JAPAN TAPPI No. 52 is a value measured by the optical automatic measurement method defined in 52.

When the weight-weighted average fiber length of the pulp of (a) is less than 0.80 mm, it is impossible to prevent the paper substrate from being peeled in the paper layer or peeled from the paper layer. As a result, non-uniform bonding increases and surface flaws are likely to occur in the resulting paper substrate and storage board.
When the fiber length distribution coefficient of the pulp of (a) is less than 2.0, the bond in the paper layer or between the paper layers becomes weak, and the paper base layer and the storage board obtained are separated from each other in the paper layer or from the paper layer. The occurrence increases. In addition, when the fiber length distribution coefficient of the pulp of (a) exceeds 4.0, non-uniform paper layer or paper layer bonding increases, and the paper base layer and the storage board obtained are separated from the paper layer or paper. The occurrence of delamination increases and the occurrence of surface defects increases.
The pulp (a) preferably has a weight-weighted average fiber length of 0.90 to 1.40 mm and a fiber length distribution coefficient of 2.5 to 4.0. If the pulp of (a) is a weight-weighted average fiber length and a fiber length distribution coefficient in the preferred range, the bond between fibers becomes stronger, so that the strength in the thickness direction of the obtained paper substrate and storage board is high. Become stronger.
In addition, when the blending amount of the pulp of (a) is less than 35% by mass, non-uniform bonding in the thickness direction is increased, and the paper substrate and the storage board obtained are peeled in the paper layer or peeled between the paper layers. Is likely to occur. Moreover, when the compounding quantity of the pulp of (a) exceeds 95 mass%, since a pulp with a large fiber length volume will reduce, the intensity | strength in the paper layer of the obtained paper base material and storage baseboard, or a paper layer will fall.

When the weight-weighted average fiber length of the pulp of (b) is less than 1.80 mm, the paper substrate obtained cannot be prevented from peeling in the paper layer or peeling between the paper layers, and if it exceeds 3.40 mm, the texture is poor. As a result, non-uniform bonding increases and surface flaws are likely to occur in the resulting paper substrate and storage board.
When the fiber length distribution coefficient of the pulp of (b) is less than 2.8, the bond in the paper layer or between the paper layers is weakened, and the paper base layer and the storage board are obtained, and the paper layer peeling or paper layer peeling is caused. It tends to occur. Moreover, when the fiber length distribution coefficient of the pulp of (b) exceeds 7.0, non-uniform paper layer or paper interlayer bonding increases, and the paper base layer and the storage board obtained are separated from the paper layer or paper. Delamination is likely to occur, and surface defects are also likely to occur.
The pulp (b) preferably has a weight-weighted average fiber length of 2.5 to 3.4 mm and a fiber length distribution coefficient of 4.0 to 7.0. If the pulp of (b) is a weight-weighted average fiber length and a fiber length distribution coefficient in the preferred range, the bond between fibers becomes stronger, so that the strength in the thickness direction of the obtained paper substrate and storage board is high. Become stronger.
Further, when the blending amount of the pulp of (b) is less than 5% by mass, the pulp having a large fiber length volume is reduced, so that the strength in the paper layer or the paper layer of the obtained paper substrate and storage board is lowered. . On the other hand, when the content exceeds 50% by mass, non-uniform paper layer or paper layer bonding increases, and surface flaws are likely to occur in the resulting paper substrate and storage board.

  When the blending amount of the pulp of (c) exceeds 60% by mass, it becomes difficult to prevent the occurrence of peeling in the paper layer or peeling between the paper layers in the obtained paper base material and storage board.

Examples of the pulp used in the first step include chemical pulp, mechanical pulp, waste paper pulp, non-wood fiber pulp, etc., and these may be used alone or in combination of a plurality of types. May be used.
The pulp is beaten by a beater such as a beater, Jordan, a deluxe refiner, a double disc refiner (hereinafter referred to as DDR), or the like.
The degree of beating is preferably about 250 to 550 ml in terms of Canadian standard freeness (hereinafter referred to as CSF) from the viewpoint of papermaking suitability.

The first polyacrylamide added to the pulp slurry is an amphoteric polyacrylamide having both cationic and anionic properties.
The mass average molecular weight of the first polyacrylamide is 1 million to 4 million. When the mass average molecular weight of the first polyacrylamide is less than 1,000,000, peeling within the paper layer or peeling between paper layers of the paper substrate tends to occur. On the other hand, when the mass average molecular weight exceeds 4 million, the fiber distribution becomes non-uniform, and surface flaws are likely to occur in the obtained paper base and storage board.
The total addition amount of the first polyacrylamide is 0.1 to 2.0% by mass when the total amount of all pulps is 100% by mass. When the total addition amount of the first polyacrylamide is less than 0.1% by mass when the total amount of all pulp is 100% by mass, it is impossible to prevent the paper substrate from being peeled in the paper layer or from the paper. There is. When the total amount of the first polyacrylamide exceeds 2.0% by mass when the total amount of all pulp is 100% by mass, the fiber distribution becomes non-uniform, Surface flaws are likely to occur on the storage board.

The second polyacrylamide added to the pulp slurry is a cationic, anionic or amphoteric polyacrylamide.
The mass average molecular weight of the second polyacrylamide is 5 million to 12 million. When the mass average molecular weight of the second polyacrylamide is less than 5 million, peeling in the paper layer or peeling between paper layers of the paper substrate may not be prevented. On the other hand, if the mass average molecular weight exceeds 12 million, the fiber distribution becomes non-uniform and surface flaws are likely to occur in the resulting paper base and storage board.
Moreover, the total addition amount of 2nd polyacrylamide is 0.01-0.1 mass% when the total amount of all the pulp is 100 mass%. When the total addition amount of the second polyacrylamide is less than 0.01% by mass when the total amount of all pulp is 100% by mass, it is impossible to prevent the paper substrate from being peeled in the paper layer or from the paper. There is. Further, when the total amount of the second polyacrylamide added exceeds 0.1% by mass when the total amount of the total pulp is 100% by mass, the fiber distribution becomes non-uniform, and the obtained paper base material and storage Surface flaws are likely to occur on the mount.

The order of addition of the first polyacrylamide and the second polyacrylamide is preferably the order of the first polyacrylamide and the second polyacrylamide. If the first polyacrylamide and the second polyacrylamide are added in this order, the texture of the resulting paper substrate can be improved, and the paper substrate can be further prevented from peeling or delamination.
This is because the fibers can be aggregated to a certain size by adding the first polyacrylamide first, and then the first polyacrylamide can be agglomerated by adding the second polyacrylamide. This is because the fiber aggregates can be aggregated more uniformly.

  The pulp slurry prepared in the first step may contain various internal additives as necessary. Examples of internally added chemicals include rosin-based sizing agents, styrene / maleic acid, alkyl ketene dimers, alkenyl succinic anhydrides, internal and internal sizing agents for papermaking, various paper strength enhancers, and improved drainage yield. Agents, water-proofing agents (for example, polyamides, polyamines, epichlorohydrins, etc.), antifoaming agents, fillers such as talc, dyes and the like can be used.

In the second step of making the pulp composition slurry prepared in the first step, the paper can be made using, for example, a paper machine such as a long net type, a circular net type, a short net type, or a twin wire type.
In that case, it is preferable to make paper so that the basis weight of the paper substrate is 200 to 1000 g / m ² . If the paper base is made so that the basis weight is 200 g / m ² or more, sufficient strength and paper thickness of the paper base can be secured, and if the paper is made so that the basis weight is 1000 g / m ² or less, the paper base Can increase productivity.

In the paper substrate production method of the present invention, it is preferable to produce a multilayer paper substrate. Specifically, in the second step, the pulp composition slurry obtained in the first step is filled into a plurality of containers (for example, inlets, etc.), and the pulp composition slurry is discharged from each container to produce a multilayer paper. It is preferable to do. When a multilayer paper base material is used, it can be easily thickened and the texture is good.
In multilayer papermaking, all pulp composition slurries may have the same composition, or some or all of the pulp composition slurries may have different compositions.
The discharge amount of the pulp composition slurry is appropriately selected according to the desired basis weight of each layer.

The total addition amount of the first polyacrylamide in the case of multilayer papermaking is the sum of the addition amount of the first polyacrylamide in the pulp composition slurry filled in each container for the pulp composition slurry in all containers. It is a quantity.
The total addition amount of the second polyacrylamide is an amount obtained by adding the second polyacrylamide addition amount in the pulp composition slurry filled in each container to the pulp composition slurry in all containers.
The total amount of all the pulps is the total amount of the pulp composition in the pulp composition slurry filled in each container for the pulp compositions in all containers.

  It is preferable that the number of layers in the case of multilayer papermaking is 2-12. If the number of stacks is 2 or more, the thickness for housing the chip-type electronic component can be easily achieved, and if the number of stacks is 12 or less, the manufacture of the paper base becomes simple.

In the paper substrate manufacturing method described above, a large interfiber network can be formed by the pulp of (b) having a large weight-weighted average fiber length and fiber length distribution coefficient, and is about ½ of the pulp of (b). With the pulp of (a) having a fiber length of about, the interfiber network of the pulp of (b) can be crosslinked to form an interfiber bond. As a result, a uniform and strong bond can be formed in the thickness direction. In addition, by adding the first polyacrylamide and the second polyacrylamide, the pulp can be uniformly agglomerated, so that the texture of the resulting paper substrate can be improved and the strength can be increased.
As a result, in the method for producing a paper base material of the present invention, it is possible to obtain a paper base material in which peeling within the paper layer or peeling between paper layers is prevented and surface layer wrinkles are hardly formed when bending stress is applied. Seem.

  Hereinafter, the present invention will be described in detail by way of examples, but the present invention is not limited thereto. Table 1 shows the weight-weighted average fiber length (W) and fiber length distribution coefficient (W / M) of the pulp used in the following examples.

Example 1
As the surface layer pulp, hardwood kraft pulp K100 mass% beaten with DDR and adjusted to 440 ml of CSF was prepared.
A pulp containing 82% by mass of hardwood kraft pulp A beaten with DDR and adjusted to CSF 400 ml, and 18% by weight of softwood kraft pulp B beaten with DDR and adjusted to 480 ml of CSF was prepared as a middle layer pulp.
As the back layer pulp, hardwood kraft pulp K100% by mass was prepared.
Next, a sulfuric acid band, size pine N-771 (manufactured by Arakawa Chemical Industries, Ltd., rosin emulsion sizing agent), first pulp slurry containing surface pulp, pulp slurry containing middle layer pulp, and back layer pulp. Polystron PS1260 (produced by Arakawa Chemical Industry Co., Ltd., amphoteric polyacrylamide type paper strength agent, mass average molecular weight 3.5 million, expressed as “PS1260” in Tables 2 and 3), which is polyacrylamide, was added to add three kinds. A pulp composition slurry was prepared. At that time, the total addition amount of the sulfuric acid band was 0.94 mass% when the total pulp total amount was 100 mass%, the total addition amount of size pine N-771 was 100 mass%, and the total pulp total amount was 100 mass%. The total addition amount of Polystron PS1260 was 1.0% by mass when the total amount of total pulp was 100% by mass.
Next, the above pulp composition slurry was filled into each of eight inlets, and the pulp composition slurry was discharged from each inlet, and multilayer papermaking was performed by a circular net type eight-layer papermaking machine. At this time, HH102 (made by Kurita Kogyo Co., Ltd., cationic polyacrylamide-based paper strength agent, mass average molecular weight: 8 million) is added to 0.28% by mass of each pulp composition slurry near the inlet of the paper machine. Was added. The total amount of HH102 added was 0.02% by mass when the total amount of total pulp was 100% by mass.
Further, in the multilayer papermaking, among eight layers, the first layer surface (basis weight ^{60 g} / m 2), 2-7-layer and middle layer (basis weight 680 g / ^{m 2),} the back layer and the eighth layer ( The basis weight was 60 g / m ² ).
Next, 1.0 g / m ² of polyvinyl alcohol having a saponification degree of 98 mol% and a polymerization degree of 1000 was applied as a dry coating amount by a size press machine and smoothed by a smoothing machine (machine calendar) installed in the paper machine. The paper base material having a basis weight of 800 g / m ² and a thickness of 0.95 mm was obtained.

Example 2
A paper base material was obtained in the same manner as in Example 1 except that as the middle layer pulp, one containing 82% by mass of hardwood kraft pulp N82 mass% adjusted with DDR and adjusted to CSF 400 ml and 18% by mass of softwood kraft pulp B was used. It was.

Example 3
A paper base material was obtained in the same manner as in Example 1 except that as the intermediate layer pulp, one containing 82% by mass of hardwood kraft pulp A and 18% by mass of softwood kraft pulp B18 beaten with DDR and adjusted to 480 ml of CSF was used. It was.

Example 4
Newspaper which used hardwood kraft pulp A 100% by weight as surface layer pulp, beats hardwood kraft pulp A 18% by weight, DDR, softwood kraft pulp B 18% by weight, DDR, and adjusts to CSF 400 ml as middle layer pulp A paper base material was obtained in the same manner as in Example 1 except that one containing waste paper pulp M64% by mass and using hardwood kraft pulp A 100% by mass as the back layer pulp.

Example 5
As the pulp for the middle layer, the one containing 38% by mass of hardwood kraft pulp A and 62% by mass of softwood kraft pulp B was used, and the pulp for the back layer was beaten with DDR and used except that 100% by mass of hardwood kraft pulp A was used. A paper substrate was obtained in the same manner as in Example 1.

Example 6
A paper base material was obtained in the same manner as in Example 1 except that as the middle layer pulp, used was one containing recycled paper pulp L82% by mass, which was beaten with DDR and adjusted to CSF 340 ml, and softwood kraft pulp B18% by mass. .

Example 7
As a surface layer pulp, a hardwood kraft pulp K40% by mass and a hardwood kraft pulp A 60% by mass are used. As a middle layer pulp, a hardwood kraft pulp A100% by mass is used. As a back layer pulp, a hardwood kraft pulp A100 is used. A paper base material was obtained in the same manner as in Example 1 except that% by mass was used.

Example 8
As the intermediate layer pulp, one containing 82% by mass of hardwood kraft pulp C beaten with DDR and adjusted to CSF 400 ml, and one of softwood kraft pulp D 18% beaten with DDR and adjusted to CSF 480 ml was used. Moreover, the total addition amount of Polystron 1260 added to the pulp slurry is 1.70% by mass when the total pulp total amount is 100% by mass, and the total addition amount of HH102 is 100% by mass. It was 0.05 mass% at the time of making. A paper base material was obtained in the same manner as in Example 1 except these.

Example 9
A paper base was obtained in the same manner as in Example 1 except that the total amount of Polystron 1260 added to the pulp slurry was 0.08% by mass when the total amount of total pulp was 100% by mass.

Example 10
A paper substrate was obtained in the same manner as in Example 1 except that the total amount of Polystron 1260 added to the pulp slurry was 2.2% by mass when the total amount of total pulp was 100% by mass.

Example 11
A paper substrate was obtained in the same manner as in Example 1 except that the total amount of HH102 added to the pulp slurry was 0.008% by mass when the total amount of the total pulp was 100% by mass.

Comparative Example 1
In addition to Polystron 1260, Polystron 117 (Arakawa Chemical Industries, anionic polyacrylamide paper strength agent, weight average molecular weight 400,000) was added to the pulp slurry, and HH102 was not added. A paper substrate was obtained in the same manner as in Example 1.

Comparative Example 2
A paper base was obtained in the same manner as in Example 1 except that the total amount of HH102 added to the pulp slurry was 0.2% by mass when the total amount of total pulp was 100% by mass.

Comparative Example 3
A paper base material was obtained in the same manner as in Example 1 except that a pulp containing 82% by mass of hardwood kraft pulp G and 18% by mass of softwood kraft pulp B beaten with DDR and adjusted to CSF 400 ml was used as the middle layer pulp. It was.

Comparative Example 4
A paper base material was obtained in the same manner as in Example 1 except that as the middle layer pulp, one containing hardwood kraft pulp H82% by mass beaten with DDR and adjusted to CSF 400 ml and softwood kraft pulp B18% by mass was used. It was.

Comparative Example 5
A paper base material was obtained in the same manner as in Example 1 except that as the intermediate layer pulp, one containing 82% by mass of hardwood kraft pulp A and 18% by mass of softwood kraft pulp I18 beaten with DDR and adjusted to 480 ml of CSF was used. It was.

Comparative Example 6
A paper base material was obtained in the same manner as in Example 1 except that as the intermediate layer pulp, one containing 82% by mass of hardwood kraft pulp A and 18% by mass of softwood kraft pulp J18 beaten with DDR and adjusted to 480 ml of CSF was used. It was.

In addition, although the mass ratio of the pulp in Examples 1-11 is shown in Table 2, and the mass ratio of the pulp in Comparative Examples 1-6 is shown in Table 3, this mass ratio is a value calculated | required in consideration of the basic weight of each layer. is there.
Hereinafter, Example 1 will be described as an example.
Surface layer Pulp K 60 [g / m ² ] × 100 [% by mass] = 60 [g / m ² ]
Middle layer Pulp A 680 [g / m ² ] × 82 [% by mass] = 578 [g / m ² ]
Pulp B 680 [g / m ² ] × 18 [% by mass] = 122 [g / m ² ]
Back layer Pulp K 60 [g / m ² ] × 100 [% by mass] = 60 [g / m ² ]
(Mass ratio of pulp A [mass%]) = (578 [g / m ² ]) / (60 [g / m ² ] +680 [g / m ² ] +60 [g / m ² ]) × 100 = 70 [ mass%]
(Mass ratio of pulp B [mass%]) = (60 [g / m ² ]) / (60 [g / m ² ] +680 [g / m ² ] +60 [g / m ² ]) × 100 = 15 [ mass%]
(Mass ratio of pulp K [mass%]) = (60 [g / m ² ]) / (60 [g / m ² ] +680 [g / m ² ] +60 [g / m ² ]) × 100 = 15 [ mass%]

  According to the freeness, water retention, weight-weighted average fiber length (W), fiber length distribution (W / M), peelability, bending stress of the disintegrated pulp of the paper base material obtained in each example and each comparative example The resulting surface wrinkles were evaluated by the following method. The evaluation results are shown in Tables 2 and 3. In addition, the paper base material was used for evaluation after pre-processing according to JIS P8111.

(Measurement method of freeness)
The paper base material was disaggregated by the pulp disaggregation method described in JIS P 8220, and the disaggregated pulp obtained thereby was measured and determined in accordance with JIS P 8121.

(Measurement method of water retention)
The paper base material was disaggregated by the pulp disaggregation method described in JIS P8220, and the disaggregated pulp thus obtained was separated by JAPAN TAPPI No. 26, measured and determined.

(Measurement method of weight-weighted average fiber length and fiber length distribution coefficient)
The paper base material was disaggregated by the pulp disaggregation method described in JIS P8220, and the fiber length of the obtained disaggregated pulp was measured by Fiber Lab (manufactured by Kajaani), and the weight-weighted average fiber length (W) and the number average The fiber length (M) was determined. Then, the weight weighted average fiber length (W) and the number average fiber length (M) are substituted into the weight weighted average fiber length (W) / number average fiber length (M) formula to obtain the fiber length distribution coefficient. Calculated.

(Peelability evaluation method)
The peelability of the paper substrate was evaluated using an ironing test apparatus 10 as shown in FIG. Here, the ironing test apparatus 10 includes a first metal roll 11 having a diameter of 76 mm, a second metal roll 12 having a diameter of 116 mm, and a rubber roll 13 having a diameter of 60 mm, which are driving rolls. The peripheral surface of the first metal roll 11 and the peripheral surface of the second metal roll 12 are disposed so as to face each other. The width of each roll is 13.5 cm.
Above the ironing peeling evaluation method using a test apparatus 10, the width of the resulting paper substrate 8 mm, cut to length 54.5cm, and an annular piece of paper S ₁ by joining edges together in longitudinal direction. Next, the annular paper piece S ₁ is squeezed so that the inner surface is in contact with the peripheral surface of the first metal roll 11 and the second metal roll 12 and the outer surface is in contact with the peripheral surface of the rubber roll 13. The test apparatus 10 was attached. Then, as an annular piece of paper _{S 1} it is being squeezed by the first metal roller 11 and a second metal roll 12 and a rubber roll 13, a load 1.8 kg, was added to the annular piece of paper _{S 1} through the rubber roll 13. In this state, by driving the first roll 11 was around the annular piece of paper S ₁ at 1.6 seconds / one rotation speed. In this case, at the one side and the other surface side of the annular piece of paper S _1, since the direction of the force applied are different, the paper layer in the peeling or paper delamination becomes likely state.
The annular piece of paper S ₁ is to measure the number of times a paper layer peeling or paper delamination was circulating to not occur. As the number of times increases, it indicates that separation within the paper layer or separation between the paper layers is prevented.

(Evaluation method for surface defects caused by bending stress)
As shown in FIG. 2, the width 8mm from the paper substrate, the paper _{S 2} taken on the length 20 cm, was wrapped around a glass 500ml beaker 21 having a diameter of 90 mm. At that time, the surface layer of the paper piece S ₂ was in contact with the beaker 21. Then, from the inside of the beaker 21, were counted 4mm or more wrinkle occurred on the surface layer side of the paper S _2. In addition, when the number of ridges exceeds 20, there are practical problems. Specifically, adhesion failure with the top cover tape occurs.

In the production methods of Examples 1 to 11 in which a specific pulp is used and a specific amount of specific polyacrylamide is added, the paper substrate obtained is prevented from peeling in the paper layer or from the paper layer, and the paper base material. Even when bending stress was applied to the surface, it was difficult to produce surface defects.
On the other hand, in the manufacturing method of Comparative Example 1 in which the first polyacrylamide having a molecular weight of 1 million or less was used and the second polyacrylamide was not added, the paper substrate was peeled in the paper layer or peeled between the paper layers. Was not prevented.
In the production method of Comparative Example 2 in which the total amount of the second polyacrylamide added exceeded 0.1% by mass, many surface defects were generated when bending stress was applied to the paper substrate.
In the production methods of Comparative Examples 3 and 4 that did not contain the pulp of (a), the paper substrate was not prevented from peeling in the paper layer or peeling between the paper layers.
In the production method of Comparative Example 5 that does not include the pulp of (b) and the weight-weighted average fiber length of the pulp used in place of the pulp of (b) was less than 1.80 mm, in the paper layer of the paper base material Peeling or paper delamination was not prevented.
In the production method of Comparative Example 6 which does not include the pulp of (b) and the weight-weighted average fiber length of the pulp used instead of the pulp of (b) exceeds 3.40 mm, bending stress is applied to the paper substrate. When applied, a large number of surface defects were generated.
In addition, although said evaluation is a thing with a paper base material, since a storage mount is what provided the recessed part or the perforation part in the paper base material, it becomes the same result as evaluation of a paper base material.

It is a schematic block diagram which shows an ironing test apparatus. It is a figure which shows the evaluation method of the surface flaw produced by bending stress.

Claims (5)

A chip-type electronic component storage board provided with a recess or a perforated portion for storing a chip-type electronic component on a paper substrate,
The freeness of the disaggregated pulp obtained by disaggregation by the pulp disaggregation method described in JIS P 8220 is 300 to 570 ml as measured in accordance with JIS P 8121. JAPAN TAPPI No. The water retention measured according to No. 26 is 100 to 135%, and JAPAN TAPPI No. The weight-weighted average fiber length measured by the pulp fiber length test method in the optical automatic measurement method defined in 52 is 1.30 to 2.0 mm, and the fiber length distribution coefficient is 2.50 to 4.50. A chip-type electronic component storage board characterized by the above. A chip-type electronic component storage board substrate having a step of adding a first polyacrylamide and a second polyacrylamide to a pulp slurry to prepare a pulp composition slurry, and a step of making the pulp composition slurry A manufacturing method of
As a pulp slurry, a blend of the following pulps (a) to (c) is used:
As the first polyacrylamide, an amphoteric one having a mass average molecular weight of 1,000,000 to 4,000,000 is used, and the total addition amount of the first polyacrylamide is 100% by mass of the total pulp. 0.1 to 2.0 mass%,
As the second polyacrylamide, one having a mass average molecular weight of 5 million to 12 million is used, and the total addition amount of the second polyacrylamide is 0.01 to 0 when the total amount of all pulp is 100 mass%. A method for producing a chip-type electronic component storage board substrate, characterized in that the content is 1% by mass.
(A): Pulp having a weight-weighted average fiber length of 0.80 to 1.40 mm and a fiber length distribution coefficient of 2.0 to 4.0: 35 to 95% by mass
(B): Pulp having a weight-weighted average fiber length of 1.80 to 3.40 mm and a fiber length distribution coefficient of 2.8 to 7.0: 5 to 50% by mass
(C): Pulp other than (a) and (b): 0 to 60% by mass   The chip-type electronic component storage board base according to claim 2, wherein in the step of making the pulp composition slurry, the pulp composition slurry is filled into a plurality of containers, and the pulp composition slurry is discharged from each container to make a multilayer paper making. A method of manufacturing the material.   A paper substrate manufactured by the method for manufacturing a chip-type electronic component storage board substrate according to claim 2 or 3. 5. A chip-type electronic component storage board, wherein the paper base according to claim 4 is provided with a recess or a perforated portion for storing the chip-type electronic component.

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