JP2003160175A - Pad for packaging - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new packaging method in which edge fusing is suppressed by using a pad to package a roll for preventing sticking of dirts and appearance trouble of the end surface of a laminated body element (roll) of a photosensitive resin. <P>SOLUTION: The pad is used for packaging the laminated body element of the photosensitive resin. This pad covers the entire surface of the end face of the laminated body element of the photosensitive resin, and has a surface having scattered protrusions which can contact with the end surface. The surface has a central line average roughness (Ra) of 2-10 μm, a ten-point average roughness (Rz) of 10-50 μm, and a maximum height (Rmax) of 25-100 μm under measurement in accordance with JIS-B0601. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pad for suppressing a phenomenon (hereinafter referred to as an edge fuse) that a photosensitive resin exudes from an end face of the photosensitive resin laminate element in the photosensitive resin laminate element. .

[0002]

2. Description of the Related Art In the production of printed wiring boards and the like, photosensitive resin laminates are used when forming conductor circuits by etching or plating. Generally, a photosensitive resin laminate is formed by applying a photosensitive resin composition on a support such as a light-transmitting polyester and drying the support, and then forming a protective layer such as polyethylene on the dried photosensitive resin layer. Manufactured by laminating. The produced photosensitive resin laminate is wound around a cylindrical winding core (hereinafter, referred to as a core) by applying a certain amount of tension to form a roll-shaped photosensitive resin laminate element (hereinafter, referred to as a roll). Become. The roll is covered with a protective sheet that is wider than the core and has a light-shielding property.Furthermore, in order to keep it suspended in the cardboard box during storage and transportation,
A plastic support plate (hereinafter referred to as a core holder) is inserted from both ends of the core and packed in a cardboard box.

The photosensitive resin of the photosensitive resin laminate is required to adhere well to a substrate such as a printed wiring board, so that it is semi-solid even at room temperature and is flexible, adhesive and fluid. There is. When packaging a roll, a method is generally used in which a plastic flat ring-shaped pad is attached so as to cover the end face of the roll. The pad is attached to prevent dust from adhering to the end surface of the roll, and to prevent a defect in appearance due to a non-uniform pattern caused by the contact of the protective sheet with the end surface of the roll.

However, depending on the type of the photosensitive resin, when a plastic flat ring-shaped pad is attached to the end surface of the roll, edge fuses may be uniformly generated on the contact surface between the end surface of the roll and the pad. . Since the photosensitive resin laminate is wound by applying tension, a phenomenon (edge fuse) occurs in which the semi-solid photosensitive resin exudes from the end surface of the roll with the lapse of time after production. As a result, the extruded photosensitive resins adhere to each other at the end faces of the rolls, and when the photosensitive resin laminate is pulled out from the roll to be laminated on the substrate, it does not emit sound or is not smoothly pulled out. Lamination defects such as slack and wrinkles occur. Further, the crushed pieces of the resin layer that have exuded adhere to the substrate before laminating and cause various defects.

As a method of suppressing the edge fuse,
Generally, a photosensitive resin is softened by absorbing moisture, and thus a method of lowering environmental humidity in a packaging bag has been proposed. For example, a method of packaging a laminate element with a desiccant (US Pat. No. 4,680,248), a method of packaging a laminate element with a film having low moisture permeability (US Pat. No. 4,852,732), and laminating a sheet-like desiccant. A method of packaging by contacting the end face of the body element (Patent No. 2)
No. 730630) has been proposed.

However, even with such a method, sufficient suppression of the edge fuse cannot be achieved, and the cost is high when a desiccant is used, and the end face of the roll generated from the desiccant is expensive. There was a problem with dust adhesion and treatment of the desiccant after use.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a pad is used for roll packaging in order to prevent dust from adhering to the end surface of a photosensitive resin laminate element (roll) and appearance defects, while using an edge. It is an object of the present invention to provide a new packaging method for suppressing fuses.

[0008]

As a result of studying a method for solving the above-mentioned problems, the present inventors have found that the contact of a flat film with the end face of the roll is a major cause of accelerating the edge fuse. It was It was found that if multiple indentations were made on the surface of a plastic flat ring-shaped pad, it would prevent dust from adhering to the end face of the roll and defects in appearance, and would further suppress edge fuses. The present invention has been completed.

That is, the present invention is as follows. (1) A pad used for packaging a photosensitive resin laminate element, which has a surface which covers the entire end face of the photosensitive resin laminate element and is dotted with convex portions which can come into contact with the end face, The center line average roughness (Ra) measured by JIS-B0601 of the surface is 2 to 10 μm, the ten-point average roughness (Rz) is 10 to 50 μm, and the maximum height (Rmax) is 25 to 100 μm. A pad characterized by being. (2) The pad according to (1), characterized in that the material is polypropylene. (3) A method for packaging a photosensitive resin laminate element using the pad, the protective sheet and the support plate according to (1) or (2).

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below. The pad of the present invention may have a surface that covers the entire exposed end surface of the roll of the photosensitive resin layer of the photosensitive resin layered body and that has convex portions that are in contact with the end surface of the roll. is necessary. Furthermore, the center line average roughness (Ra) measured by JIS-B0601 is 2 to 10 μm, and the ten-point average roughness (Rz) is 10 to 10 on the surface where the convex portions that can come into contact with the end surface of the roll are scattered. It is formed by an uneven surface having a maximum height (Rmax) of 50 to 100 μm.

By covering the entire end surface of the roll, the pad has an effect of preventing dust from adhering to the end surface of the roll and a defect in appearance. Since the surface of the pad has the above-mentioned roughness, the entire surface of the pad and the end surface of the roll are not in contact with each other, but are in contact with the projections that are substantially uniformly scattered. The surface where the convex portions of the pad that are in contact with each other are required to have a roughness within the above range, and if the roughness is outside the above range, the end surface of the roll and the pad are not a point but a surface. There is a partial contact, and the effect of suppressing the edge fuse is not seen.

The shape of the pad may be such that it covers the end surface of the roll, the core portion is hollowed out, and the shape of the ring is substantially the same as the area of the end surface of the roll, but is not limited thereto. . The thickness of the pad is preferably 0.1 to 1 mm from the viewpoint of easy handling and cost. As the material of the pad, plastic, paper, unwoven cloth, metal or the like is used. Plastic is preferably used from the viewpoint of workability and preventing dust from adhering to the photosensitive resin laminate.

When plastic is used, polyethylene, polypropylene, polyethylene terephthalate,
It is prepared by a method such as injection molding or extrusion molding using a usual thermoplastic resin such as polybutylene terephthalate, polyamide, polystyrene, AS resin and ABS resin. Polypropylene is preferably used. When using plastic, the uneven surface is formed by a satin roll or the like immediately after extrusion.

Photosensitive resin laminate element (roll)
1 is obtained by winding a photosensitive resin laminate 1 around a cylindrical winding core (core) 2 as shown in FIG. 1, and is generally acrylonitrile wider than the width of the photosensitive resin laminate. -Butadiene-styrene copolymer (ABS) resin wound on a round tube. In the present invention, the pad 3 is attached to the end surface of the roll. Mounting two rolls on both end surfaces of the roll is a preferred pad mounting mode of the present invention.

As a method for packaging the roll, a pad is attached to the end surface of the roll, the roll is wrapped in a protective sheet, the remaining portion of the sheet is folded into the voids in the tube at both ends of the core, and then both ends of the core are inserted into a support plate. The method of making a suspended state is generally used. The reason for inserting both ends of the core into the support plate and leaving it in a suspended state is to prevent the laminated laminated element from moving in a shipping box such as corrugated board during shipping or storage so that it will not get scratches or dents. This is to prevent this.

A black light-shielding sheet is used as the protective sheet in order to prevent light exposure during transportation and storage. The material is
Examples thereof include polyethylene, polypropylene, polyethylene terephthalate, polyamide, polystyrene, polyvinyl chloride and the like. The protective sheet may have a sheet shape or a tube shape as long as it can completely wrap the roll. After covering the roll, the sheet may remain open or may be sealed by heat sealing. The support plate (core holder) has a structure in which both ends of the core can be inserted, and it is sufficient that the roll can be suspended. Polypropylene or the like is used as the material.

The characteristics used in the present invention are measured by the following methods. (A) Pad surface roughness measurement Surface roughness shape measuring instrument Surfcom (registered trademark) 570A
(Made by Tokyo Seimitsu Co., Ltd.). A width of 20 mm and a length of 40 mm are cut out from a ring-shaped plastic plate pad to obtain a measurement sample. The cutoff value is 0.8 mm, the measurement length (reference length) is 10 mm, and the probe is driven at a speed of 0.3 mm / sec for measurement. Ra, Rz, R
The value of max is based on the definition of JIS-B0601.

(B) Edge fuse test A photosensitive resin laminate having a width of 334 mm is wound around a core having an outer diameter of 83 mm to form a roll having a diameter of 160 mm. After leaving the prepared rolls for 5 days under the conditions of a temperature of 30 ° C. and a humidity of 50%, the exudation state from the end faces of the rolls is ranked according to the following criteria. A: No bleeding at all B: Slight bleeding out C: Slight bleeding out D: Significant bleeding out, part of which shines like a mirror E: Excessive bleeding, mirror-finished surface When the shining rank is A to C, there is no practical problem.
The case of D or E is set as a level that is not practical.

The present invention will be described based on examples.

[0020]

Example 1 Sunfort (registered trademark) manufactured by Asahi Kasei Corporation
AQ-4059 (38 μm thick photosensitive resin layer sandwiched between 22 μm thick polyethylene film and 19 μm thick polyethylene terephthalate film, width 3
34 mm of photosensitive laminated film) is wound around a hollow core of ABS resin having an outer diameter of 83 mm and tension 1
A roll having a diameter of 160 mm was prepared by winding at 5 kg / m. The surface roughness Ra = 2.
3, Rz = 20.9, Rmax = 33.0 (measured value), outer diameter 160 mm, inner diameter 84 mm, thickness 200 μm
The polypropylene ring-shaped pad (PPS-CM manufactured by Seadam Co., Ltd.) was attached. After that, the length is 740m
m, thickness of 80 μm, tubular black polyethylene film with a diameter of 191 mm is put on a roll equipped with a polypropylene ring pad, folded into the void of the inner circumference of the core, both ends of the core are inserted into the core holder, and the edge fuse test is performed. went. The rank of the edge fuse test was B.

[0021]

Example 2 The ring-shaped pad in Example 1 has a surface roughness of Ra = 5.3, Rz = 40.7, and Rmax = 5.
0.5 (measured value), outer diameter 160 mm, inner diameter 84 m
m, and the thickness was 500 μm, and the procedure was performed in the same manner as in Example 1 except that the polypropylene ring-shaped pad (PPS-NL, manufactured by Seadam Co., Ltd.) was used. The rank of the edge fuse test was B.

[0022]

Comparative Example 1 The ring-shaped pad of Example 1 has surface roughnesses of Ra = 0.9, Rz = 8.8, Rmax = 18.
1 (measured value), outer diameter 160 mm, inner diameter 84 mm,
The same procedure as in Example 1 was performed except that a desiccant sheet having a thickness of 1 mm (a ring-shaped sheet made of paper pulp impregnated with a desiccant and covered with a film of polyethylene terephthalate having a thickness of 30 μm) was used. The edge fuse test rank was D.

[0023]

By attaching the pad of the present invention to the photosensitive resin laminate, it is possible to prevent dust from adhering to the end face of the photosensitive resin laminate element (roll) and prevent defects in appearance.
Moreover, the edge fuse can be suppressed.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an example of using a pad.

[Explanation of symbols]

1 Photosensitive resin laminate 2 cores 3 Ring-shaped pad

Claims (3)

[Claims] 1. A pad used for wrapping a photosensitive resin laminate element, the pad having a surface which covers the entire end face of the photosensitive resin laminate element and is interspersed with convex portions capable of contacting the end face. The center line average roughness (Ra) measured by JIS-B0601 of the surface is 2 to 10 μm, the ten-point average roughness (Rz) is 10 to 50 μm, and the maximum height (Rmax) is 25 to A pad characterized by having a thickness of 100 μm. 2. The pad according to claim 1, wherein the material is polypropylene. 3. A method for packaging a photosensitive resin laminate element using the pad, the protective sheet and the support plate according to claim 1.