KR20040064469A - A stencil paper for carrier tape - Google Patents

Abstract

PURPOSE: Raw paper for a carrier tape is characterized by using PVA and polyethylene imine together, not occurring tearing of fiber and separation of an outer layer in exfoliating, having stable exfoliation strength and reducing process defective. CONSTITUTION: Raw paper for a carrier tape is obtained by the steps of: using chemical pulp as raw material; mixing long fiber and short fiber in a ratio of 1:9 - 5:5; beating the mixed pulp on 350-500ml.csf; adding 1-8wt.% of cationic starch to the pulp; putting 1-5% of a paper strengthening agent on a surface to manufacture the raw paper; and then coating a cover tape-adhered side with 1-8% of PVA and 1-8% of polyethylene imine based on concentration.

Description

Paper for carrier tape {A stencil paper for carrier tape}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carrier tape paper used for storing and transporting chip-type electronic components and auto-mounted parts. In order to supplement the surface properties of the paper, PVA (poly ethylene alcohol) and poly ethylene imine (imine-based polymer) are mixed and coated on the surface of the paper to adjust the adhesion and peeling force, which is the core quality of the carrier tape, to reduce process defects. Of course, the present invention relates to a base paper for a carrier tape that can prevent chip detachment generated during automatic mounting.

Recently, chip-type electronic parts have been produced in ultra-small size of 0.3 ~ 0.6mm, and the packaging form for storing and transporting these small chip parts has been changed in various ways, but the carrier tape storage method is more suitable for standardized automation work than other methods. It is widely used because it is advantageous. The chip type electronic component carrier tape which is widely used as described above generally has a top surface of a carrier tape substrate made of a base paper having a hole for mounting chip components and a perforation hole for transportation, and a carrier tape substrate containing zoned parts. It consists of a cover tape covering and a bottom tape covering the bottom.

There are various types of carrier tapes as described above.A general form of the carrier tape is an ambos carry tape formed by using a thermoplastic polymer or a pulp mold as a material, and a planar carrier tape having a perforated shape. It is made of a thinly cut flexible material, and it must have a suitable strength because a drilling process for mounting chip components must be performed. Rubber, metal foil or polymer material may be used as the material, but paper and resin products are widely used in consideration of ease of operation and cost.

In particular, the carrier tape base material of the carrier tape is basically a physical property such as internal bonding, stiffness, peeling strength, immersion conditions and composition conditions for dimensional stability, method of securing thickness by lamination, etc. Need condition.

In this regard, Korean Patent No. 170579 discloses a method of manufacturing a carrier tape base material by laminating a polyvinyl acetate or an acrylic polymer-based water-soluble adhesive with an interlayer adhesive on a base paper.

However, the patent does not define the peel strength and adhesion of the cover tape, which is the core quality of the carrier tape, so that the adhesion and peeling force control are imbalanced, such as applying only epamine. There is a problem that a process defect occurs, such as tearing or a decrease in the adhesive strength of the cover tape.

In addition, Korean Patent No. 356454 discloses a method for producing a chip-type electronic component carrier tape base material comprising a paper production step through a conventional paper machine and a paper lamination step using a lamination machine, but the steps are complicated and polyethylene as an adhesive By using only resin, problems such as surface separation during peeling and fiber tearing of the base paper are not solved.

In another prior art, Korean Patent Laid-Open Publication No. 2000-39497 discloses a variety of methods for the composition, blending and coating conditions of the base paper using chemical pulp, mechanical pulp, recycled pulp or a mixture thereof as the base material, but here In the method of manufacturing the base of the carrier tape, the inorganic filler used to reinforce the dimensional stability and the perforated surface may increase the rapid wear or dimensional strain of the perforated mold, which may cause deterioration of long-term storage ability of the needle, and it may be immigration based on surface coating. By using a polymer and starch, the emphasis is on reinforcing the adhesion between the cover tape and the base paper, resulting in surface separation and fiber tearing of the base paper when the cover tape is peeled off, and there is a problem that cannot solve a large amount of equity.

The present invention has been invented to solve the above problems, the present invention is a common disadvantage of the method of producing the base paper of the carrier tape and the production of recycled pulp by laminating the base paper produced using only chemical pulp Solving the above problems shows the cost saving effect due to the reduction of the process defect rate, the improvement of the operation rate, and the decrease of the defective rate, as well as the prevention of surface separation when peeling the cover tape, the prevention of tearing of the fiber of the paper, and the increase of adhesive force. The purpose is to provide.

The present invention for achieving the above object

In the carrier tape using a multilayer paper machine, the entire layer uses only chemical pulp and the carrier tape base coated with 1-8% PVA and 1-8% polystyrene based on the concentration is applied to the surface to which the cover tape is bonded. do.

Here, the base paper is chemical pulp as a raw material, and the ratio of NBKP (long fiber) and LBKP (short fiber) is 1: 9-5: 5, and is beaten at Yeosu-do 350-500mlcsf. It is preferably prepared by adding 1% to 5% of the strength enhancer added to the surface layer.

In the above, when the concentration of PVA is less than 1%, the surface strength is weak and there is a concern that the separation of the fiber layer and the surface layer may occur when the cover tape is peeled off. If the concentration is more than 8%, the surface strength does not increase any more, but due to the use of unnecessary raw materials. Manufacturing costs rise. In addition, if the amount of polyethyleneimine is less than 1%, the adhesive strength of the cover tape becomes weak, and the peeling strength of the cover tape becomes less than the standard. If more than 8% is applied, the adhesive strength of the cover tape becomes too strong and the peeling strength of the standard exceeds the process. Since defects occur, their content is preferably in the above range.

Hereinafter, the preferred embodiment of the present invention will be described in detail.

Carrier tape and a manufacturing method through the present invention will be described in terms of composition conditions and papermaking conditions and will be described while comparing with the conventional method except for the general contents.

To make up for the shortcomings of raw paper made by mixing recycled pulp and chemical pulp, the ratio of long fiber and short fiber is 1: 9 ~ 4: 6 using only chemical pulp as raw material of raw paper. Treat it as a CSF range.

Regenerated pulp has long-term storage, dimensional strain, and stakes, so it is advantageous to use chemical pulp.

The fiber mix ratio and Yeosu should be adjusted according to the type of fiber, which causes changes in residual fiber, workability due to Steveness change, and internal bonding.

It also affects energy costs, raw material costs, etc., and adjusts accordingly according to the quality result.

The interlayer bond strength and internal bond strength of the base paper are important properties throughout the process of using chip components.They are directly affected by the degree of freedom of raw materials, the use of an internal strengthening agent, and starch, and the chemicals are added to the wet part in the papermaking process. , Polyacrylamide is preferably added in 3 to 8% by weight of the raw material.

The internal binding degree can be assured if it is more than 1000ft.1bt / 1000in 2 by TAPPI standard test method, so adjust the amount of starch according to the result.

In addition, the use of TALC or calcium carbonate, which is usually added during papermaking, should be suppressed to reduce the mold wear rate and to minimize the use of the sized agent containing sulfur, thereby ensuring long-term storage of the chip.

Hereinafter, the surface treatment conditions as described in the present invention will be described.

"To meet the level of 10 ~ 70 gf of peel strength of Top Tape, which was the standard when manufacturing raw paper made of chemical pulp as a raw material, the smoothness by TAPPI T479 should be more than 50sec." Without crayon or powder coating on the surface of the paper, smoothness cannot be achieved over 50sec. If the coating is not done, the adhesion and peeling force cannot be controlled, such as the adhesion strength or the strong adhesion. In addition, when the smoothness is low, only the epamine is applied and manufactured, but surface peeling force cannot be controlled.

In addition, the surface coating method described in the original paper production technique using recycled pulp (coated at 1 ~ 10% concentration of starch oxide to increase the surface strength, coated 0.1 ~ 3g / ㎡ on the surface of paper and imine polymer at the same concentration Treating the surface with the same coating amount) can not fully reinforce the surface strength, and the immigrant polymer only reinforces the adhesive strength with the top tape, but the peeling force cannot be controlled.

Therefore, in order to solve this problem, 1% weight ratio of cationic starch is added to the bed to increase the fiber layer binding force, and then PVA increases the surface strength when mixed with PVA2 ~ 5% concentration and polyethylenimine 2 ~ 5%. Improved surface smoothness prevents fiber and surface separation during peeling, and the peel strength can be maintained uniformly as the smoothness rises, and the PIE ethylene imine component can enhance the adhesive strength. IRON temperature and pressure can be adjusted freely and work stably.

The invention is described in more detail based on the following examples and is not limited to these examples.

<Example 1>

Chemical pulp is used as a raw material, and NBKP and LBKP are mixed at a ratio of 3: 7, and then beaten at 420mlcsf in Yeosu, adding 1% of positive starch by weight. 475 탆 paper was produced and 3% PVA and 3% epomin were applied to the adhesive layer.

<Example 2>

The raw material was prepared under the conditions of Example 1 to produce raw paper, and 1% PVA and 3% epomin were grapes in the adhesive layer.

Example 3

The raw materials were prepared under the conditions of Example 1 to produce raw paper, and 3% PVA and 1% epomin were applied to the adhesive layer.

Example 4

The raw materials were prepared under the conditions of Example 1 above to produce a base paper, and 2% PVA 2% epomin was applied to the adhesive layer.

Comparative Example 1)

At present, the experiment was carried out at IRON temperature of 165 ℃ using the most widely used domestic paper.

Comparative Example 2)

The base paper of the comparative example 1 was experimented at IRON temperature of 170 degreeC.

Comparative Example 3)

The base paper of the comparative example 1 was experimented at IRON temperature of 180 degreeC.

Comparative Example 4)

The raw material of the inner layer was tested at IRON temperature of 170 ° C. using raw paper coated with 1.25% starch and 3% epomin on the surface of raw paper composed of recycled paper.

As shown in the following table, when PVA is weakly used or not applied, the surface strength is weak and fiber separation and surface separation occur. When only the epamine is applied, the adhesive force rises and the surface separation occurs when the conditions change.

table

division PVA concentration (%) Epomin concentration (%) Surface smoothness (ml / min) Peel Strength (gf) Fiber layer separation state Deviation in Peel Strength Rank (rank) Example One 3 3 90 25-30 none 5 One 2 One 3 100 15-27 none 12 2 3 3 One 90 5 ~ 14 none 9 One 4 2 2 95 10-22 none 12 One Comparative example One - 2 120 25-50 none 25 2 2 - 2 129 25-62 Fine tearing 37 3 3 - 2 119 25-75 Surface separation 50 4 4 Starch 1.25 3 110 4-12 Fiber tearing 8 4

* Peel strength is measured under the conditions of peeling at an angle of 160 to 180 at a speed of 300 mm / min.

Note) The peel strength specified in JIS is 10.2 ~ 71.4gf, and the preferred peel strength in the process is 20 ~ 30gf.

-Grade 1 means that peel strength is within the allowable range and the deviation is within 10 gf.

-Grade 2 is within 10gf of peel strength and within 10 gf.

-Grade 3 may be caused by fine tearing of the fiber during peeling or adjustment.

-Grade 4 cannot be used due to tearing of the fiber and surface layer.

As can be seen from the above table, by using PVA and polyethyleneimine together, the fiber layer (paper) separation does not appear when the cover tape is peeled off, thereby providing a stable carrier tape that does not exhibit fiber tearing or surface separation. In addition, it is possible to provide a carrier tape which can reduce the process defect and prevent chip detachment generated during automatic mounting due to the stable peel strength.

Although the preferred embodiment of the present invention has been described in detail above, the present invention is not limited thereto and may be improved or modified by those skilled in the art within the scope of the technical idea of the present invention.

Claims (2)

In the base paper for the carrier tape using a multi-layer paper machine, the entire layer uses only chemical pulp and the surface to which the cover tape is bonded is coated with 1-8% PVA based on concentration and 1-8% polyethylenimine imine based on the concentration. Carrier tape base paper. According to claim 1, wherein the base paper is chemical pulp as a raw material, the ratio of NBKP (long fiber) and LBKP (short fiber) is 1: 9-5: 5 blended at 350-500mlcsf Yeosu Carrier tape paper, characterized in that prepared by adding 1 to 8% by weight of starch and 1 to 5% of the strength enhancer to the surface layer.