JP3268522B2 - Carrier tape paper for electronic components - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carrier tape for electronic parts which is used as a carrier for chip-type electronic parts and used as a carrier for chip-type electronic parts used in a printed circuit board of electronic equipment.

[0002]

2. Description of the Related Art In order to achieve automatic production of various electronic devices, chip-type electronic components have been automatically mounted on circuit boards. In order to facilitate the handling of the electronic components in the automatic mounting process of the chip-shaped electronic components, a taping package in which the individual chip-shaped electronic components are packaged in a tape-shaped carrier is used. 2. Description of the Related Art Automatic mounting has been performed in which chip-shaped electronic components sequentially sent out in the form of a body are automatically mounted on a predetermined circuit board.

As described above, there are two types of carrier tapes for chip-shaped electronic components: those made of plastic and those made of paper. However, the production cost, the ease of handling due to the weight of the tape, and the ease of disposal after use. The carrier tape made of paper is superior in terms of the antistatic property and the antistatic property. The paper carrier tape is processed as described below and has a role as a carrier. Slit to a width of 8 mm or a specified size. A square hole (cavity) for storing chip-shaped electronic components and a round hole for feeding the carrier tape into the filling machine are formed. Adhere the cover tape to the back (bottom side) of the paper. Houses chip-shaped electronic components. Adhere the cover tape to the paper surface (top side). Shipped around a cassette reel. The user removes the top cover tape and takes out the chip-shaped electronic component.

[0004] A paper carrier tape is formed by forming square holes (cavities) for accommodating chip-like electronic components in a tape-like base paper.
Is formed, and a chip-shaped electronic component is loaded in the square hole, and a bulky electronic component having a thickness greater than the thickness of the base paper cannot be loaded.

[0005] The quality required for a carrier tape made of paper includes the following characteristics. Since it is used for packaging chip-shaped electronic components, the filled chip-shaped electronic components should not have any adverse effects such as electrostatic trouble or metal corrosion. The surface of the paper must be smooth so that the cover tape adheres or peels off. Do not cause delamination or folds even when subjected to bending, ironing or other forces with a high-speed automatic machine. When punching with paper tape, if fiber fluff remains inside the hole, it may be difficult to remove it, so it must have punching aptitude. It must be strong enough to withstand various stresses on the carrier tape. Excellent dimensional stability of raw materials, because if the feed pitch shifts during the automatic mounting process of chip-shaped electronic components, machine troubles may occur.

In contrast to the above characteristics, Japanese Patent Application Laid-Open No. 10-5947
No. 1 discloses a multilayer paperboard that does not peel off.
Japanese Patent Application Laid-Open No. 8-26335 discloses a paperboard that does not cause delamination or fold even when subjected to bending or ironing by a high-speed automatic machine. It describes a technology relating to base paper that can be efficiently produced.

Conventionally, as a problem in producing a carrier tape paper having a thickness of more than 1.0 mm, internal blistering occurs due to water vapor pressure in the paper layer, and peeling in the paper layer occurs.
In addition, it was cited that the base paper was not supple, and the product could not be manufactured due to folds occurring when the product was wound up.

[0008]

SUMMARY OF THE INVENTION The object of the present invention is to efficiently produce a multi-layered paperboard having a thickness of 1.00 mm or more, and to cause delamination and creases in a roll during production. It is an object of the present invention to provide a carrier tape paper of a chip-shaped electronic component in which the occurrence of the carrier tape is prevented.

[0009]

The object of the present invention can be attained by the following. That is, the present invention provides: (1) Multi-layered paperboard mainly composed of wood pulp having a thickness of 1.00 mm or more, wherein linter pulp is blended in all or middle layers of the multi-layered paperboard base paper.

(2) 10 to 70% by weight of linter pulp is blended in all or middle layers of the multi-layered paperboard base paper.

(3) The amount of the paper strength enhancer such as starch, modified starch, polyacrylamide, etc., to be internally added to each of the whole layer or the middle layer is 1 to 10% in solid content with respect to pulp.

(4) An electronic device characterized in that the T / Y ratio of Taber stiffness according to JIS P8125 is 2.5 or less, the surface strength according to TAPPI T459 is 2A or more, and the Stechigt size according to JIS P8122 is 500 seconds or more. It consists of carrier tape for parts.

The materials used for producing the base paper for carrier tape of the present invention and the production conditions will be described. As the pulp used in the present invention, pulp usually used is used for each layer, but in the present invention, after sealing the film-shaped cover tape, the cover tape is peeled off and used, so the strength of the surface layer is required. BKP because there is
(Bleached Kraft Pulp). In particular, considering the balance with the rigidity of the paper, it is preferable to mix NBKP (softwood bleached kraft pulp) and LBKP (hardwood bleached kraft pulp) at a ratio of 9: 1 to 1: 9. Pulp beating degree is 250 ~ Canadian Standard Freeness (CSF)
A range of 620 ml is suitable.

The linter pulp used in the present invention is a pulp obtained by purifying short hair (linter) attached to cotton and is a raw material for special paper. In the raw material preparation method, linter pulp and wood pulp obtained by beating treatment are used as raw materials.
At this time, linter pulp is applied to all or middle layers of the base paper.
７０70% by weight and a Taber stiffness (T / Y) ratio of 2.
5 or less. Preferably, linter pulp is 20-60
It is practically excellent to mix by weight%. Further, even when the cover tape is blended in all or the middle layers of the base paper, the surface smoothness and surface strength of the paper are required so that the cover tape can be satisfactorily adhered or peeled off.

[0015] If the linter pulp content is less than 10% by weight, the base paper is not supple and will have folds. Conversely, if it exceeds 70% by weight, the interlaminar strength becomes weak, which is not preferable in terms of base paper quality. In addition, it is costly and not preferable.

Each layer is made of starch,
It is necessary to internally add a paper strength enhancer such as modified starch and polyacrylamide. However, when used in a large amount, even if the stiffness is too high and the interlayer strength is strong, it is easy to be delaminated and creased by the force of bending and ironing when winding on a reel and high-speed automatic machine. . For this reason, the addition rate of the paper strength enhancer varies depending on the type of chemical, but it is preferable to add 1 to 10% as solid content to pulp.

The base paper of the present invention is subjected to a surface sizing treatment mainly using a water-soluble polymer substance by a size press installed in the middle of a drying step. In addition to the usual two-roll size press, a gate roll size press and a metering size press can also be used. Examples of the water-soluble polymer for surface sizing include oxidized starch, cationized starch, hydroxyethyl etherified starch, and enzyme-modified starch. In addition, a surface sizing agent such as polyvinyl alcohol, carboxymethylcellulose, methylcellulose, and other resin polymers can also be used. This water-soluble polymer for surface sizing is coated on both sides with a size press at 0.5 to 4 g / m ² ,
Preferably, it is applied in a range of 1 to 3 g / m ² . The amount of the water-soluble polymer for surface sizing is in the range of 5 to 100% by weight of the total surface sizing agent.

The multi-layer base papermaking of the present invention is carried out in three to five layers by a round-mesh multi-cylinder paper machine, but is not particularly limited to this method. As the physical properties of the base paper, a range of 800 g / m ² or more is suitable for rice tsubo. The paper thickness is 1.00 mm or more, the base paper surface strength is 2 A or more, the surface Smooster smoothness is 70 cmHg or less, the Stekigt sizing degree is 500 seconds or more, and the Taber stiffness (T / Y) ratio is 2.5.
It must be in the appropriate range below.

As described above, by providing the base paper for a carrier tape of the present invention, delamination and creases do not occur in a product wound on a reel when the base paper is manufactured. In addition, carrier tape paper, which is a chip-type electronic component storage board having good adhesiveness and peelability to the cover tape and having dimensional stability, interlayer strength, and rigidity of the base paper within practical ranges, can be put to practical use.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a specific structure of a carrier tape sheet as a chip-type electronic component storage board of the present invention will be described based on embodiments. The present invention is not limited by these embodiments. Unless otherwise specified, the blending percentages, addition percentages, and weights in the examples are weight percentages in terms of solid content. The paper made for all examples is JIS-P8
After performing the pretreatment according to 111, a paper quality test was performed.
Further, an 8 mm slit with a slitter, a punching process, and a cover tape were actually bonded, and after the punching process, the presence or absence of peeling and the adhesion of the top cover tape were confirmed.

Example 1 Raw Material Mixing Surface NBKP 50%, LBKP 20% linter pulp 30% Middle layer NBKP 50%, LBKP 20%, linter pulp 30% Back layer NBKP 50%, LBKP 20% linter pulp 30% Beating of the above raw materials The degree was set to 500 ml, and the paper strength enhancer was added to pulp at 1.0% and the sizing agent was added to pulp at 0.4%.
Also, in a size press, oxidized starch having a concentration of 5% was applied to both sides so as to have a concentration of ² to 3 g / m ² (solid content), and a 5-layer base paper having a paper thickness of 1.28 mm and a basis weight of 1013 g / m ² was formed. A base paper for a carrier tape of the present invention was obtained.

Example 2 In Example 1, the paper thickness was 1.36 mm and the basis weight was 105.
A carrier tape base paper of the present invention was obtained in the same manner as in Example 1 except that the amount was changed to 4 g / m ² .

Example 3 In Example 1, the paper thickness was 1.43 mm and the basis weight was 112.
A carrier tape base paper of the present invention was obtained in the same manner as in Example 1 except that the amount was changed to 1 g / m ² .

Example 4 In Example 1, the raw materials for the surface layer, the middle layer and the back layer were mixed with NB.
KP 50%, LBKP 40%, linter pulp 1
A base paper for a carrier tape of the present invention was obtained in the same manner as in Example 1 except that 0% was used.

Example 5 In Example 1, the raw materials for the surface layer and the back layer were mixed with NBKP.
A base paper for a carrier tape of the present invention was obtained in the same manner as in Example 1 except that 50% and LBKP were set to 50%.

Comparative Example 1 In Example 1, the raw materials of the surface layer, the middle layer and the back layer were mixed with NB.
A base paper for a carrier tape of the present invention was obtained in the same manner as in Example 1, except that KP was 50% and LBKP was 50%.

Comparative Example 2 In Example 2, the raw materials of the surface layer, the middle layer and the back layer were mixed with NB.
A carrier tape base paper of the present invention was obtained in the same manner as in Example 2 except that KP was 50% and LBKP was 50%.

Comparative Example 3 In Example 3, the raw materials of the surface layer, the middle layer and the back layer were mixed with NB.
A carrier tape base paper of the present invention was obtained in the same manner as in Example 3 except that KP was 50% and LBKP was 50%.

Comparative Example 4 In Example 5, NBKP 50
%, LBKP 45%, linter pulp 5%, and a base paper for a carrier tape of the present invention was obtained in the same manner as in Example 5.

The following margin

【table 1】

[0031]

The base paper for a chip-shaped electronic component carrier tape of the present invention is obtained by blending linter pulp into all or the middle layer of the base paper to prevent delamination or creasing of a product wound on a reel at the time of base paper production. Does not occur. It has the surface strength of the base paper, and the cover tape is well adhered and easy to peel off. It does not delaminate or break even when subjected to bending, ironing or other forces by a high-speed automatic machine.
Suitable for punching. Carrier tape paper with excellent dimensional stability can be put to practical use.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2000-203521 (JP, A) JP-A-9-110071 (JP, A) JP-A-9-188385 (JP, A) JP-A 2000-43975 ( JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) D21H 11/00-27/42 B65D 73/02

Claims (4)

(57) [Claims] 1. A multilayer paperboard mainly made of wood pulp having a thickness of 1.00 mm or more, characterized in that linter pulp is blended in all or the middle layer of the multilayer paperboard base paper. For carrier tape paper. 2. The carrier tape paper for electronic parts according to claim 1, wherein 10 to 70% by weight of linter pulp is blended in all or the middle layer of the multilayer paperboard base paper. 3. The addition amount of a paper-strength enhancer such as starch, modified starch or polyacrylamide to be added to each of the whole layer or the middle layer is 1 to 10% in solid content based on pulp. The carrier tape paper for electronic parts according to claim 1 or 2, wherein 4. The method according to claim 1, wherein the T / Y ratio of the Taber stiffness according to JIS P8125 is 2.5 or less, the surface strength according to TAPPI T459 is 2A or more, and the Steckigt sizing degree according to JIS P8122 is 500 seconds or more. 4. The carrier tape paper for electronic components according to 1, 2, or 3.