JP2002001822A - Heat press bonding roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat press bonding roller easy to be simply assembled or maintained with a simple structure, having a strength capable of surely heat press bonding even with a slight ruggedness, a wide area and a large uniformity of a temperature distribution and capable of being uniformly laminated. SOLUTION: In a heating roller having a hollow roller 1 and a fixed type heating element 7 in its hollow part, and an inner tube member 2 of the roller is made of copper and an outer tube member 3 of the roller is made of a double structure of iron or stainless steel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermocompression roller used in a film laminating apparatus for thermocompression bonding a film to a sheet-like substrate such as a printed wiring board.

[0002]

2. Description of the Related Art In a process of forming a circuit on a printed wiring board, a predetermined circuit pattern may be formed by subjecting a film generally called a dry film to a substrate by thermocompression exposure and exposure and etching. At this time, the surface of the printed wiring board often has irregularities, and in order to bond the film to the substrate without gaps, an iron-based roller having high pressure bonding strength is generally used as the thermocompression bonding roller.

In order to heat the above-mentioned roller, a heating element is incorporated therein. It is preferable that the heating element be integral with the roller in terms of heat conduction, but a heating element which requires electrical wiring is required. In order to rotate the, it is necessary to have a contact point of the wiring, and it is troublesome to perform maintenance such as periodic replacement of contact parts so that the contact does not cause a poor contact. The roller is hollow, and a fixed heating element is provided inside the hollow.

[0004]

However, if there is a gap between the heating element and the rotating roller, heat is difficult to be transmitted,
The temperature difference between the roller and the heating element tends to increase. For this reason, especially when it is used for an iron-based roller having relatively small heat conduction among metals, it is easy to make temperature adjustment difficult.
The temperature distribution in the axial direction of the roller also tends to be non-uniform.

[0005]

In order to solve the above-mentioned problems, the present invention is directed to a heat roller having a hollow roller and a fixed heating element in the hollow, wherein the roller has at least a double roller. The present invention provides a roller for thermocompression bonding, wherein the inner tube member of the roller is formed of a member having a higher thermal conductivity and a higher linear expansion coefficient than the outer tube member of the roller.

The specific material of the roller is copper or aluminum or an alloy thereof as the inner tube member, and iron or an iron alloy or stainless steel is used as the outer tube member.

The thermal conductivity of copper is about 400 W · m ⁻¹ · K ⁻¹ ,
The coefficient of linear expansion is about 17 × 10 ⁻⁶ , the thermal conductivity of aluminum is about 240 W · m ⁻¹ · K ⁻¹ , and the coefficient of linear expansion is about 23 × 10 ^-6
Copper having a large thermal conductivity, particularly as large as ^-6 , is preferable. On the other hand, the thermal conductivity of iron is about 80 W · m ⁻¹ · K ⁻¹ , the coefficient of linear expansion is about 12 × 10 ⁻⁶ , and the thermal conductivity of stainless steel is about 16 W · m ⁻¹ · K ⁻¹ , The coefficient of linear expansion is 12-16 × 10 ^-6
About small.

[0008] Even if the heat of the heating element is transmitted to a part of copper or aluminum which is the inner tube member of the roller, copper or aluminum has a large thermal conductivity, so that the temperature difference between the roller and the heating element is not large. In both cases, the heat is quickly transmitted to the entire roller inner tube member and becomes a more uniform heat conductor in the axial direction of the roller.Thus, even if the roller outer tube member is made of iron or stainless steel with slow heat conduction, the temperature distribution of the roller as a whole is uneven. Can be reduced.

Further, since the coefficient of linear expansion of copper or aluminum is larger than the coefficient of linear expansion of iron or stainless steel, at room temperature, the outer diameter of the inner tube member is made smaller than the inner diameter of the outer tube member and inserted into the outer tube member. Even if it is easy, the inner structure is expanded from the outer structure by heating, so that the double structure is integrated and heat is easily transmitted.

That is, the present invention has a simple structure, is easy to assemble and maintain, has strength enough to reliably perform thermocompression bonding even with some irregularities, is easy to adjust temperature, and is uniform in a large area. It is intended to provide a thermocompression bonding roller capable of achieving high uniformity of temperature distribution.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a hollow roller having a double structure. The inside of the hollow roller 1 is an inner tube member 2 made of copper or aluminum, or an alloy obtained by adding silver, chromium, or the like to copper, or an alloy obtained by adding manganese, silicon, or the like to aluminum. , An outer tube member 3 made of an alloy to which molybdenum, silicon or the like is added, or stainless steel. On the surface, an elastic member 4 such as silicon rubber or fluorine rubber is generally baked in order to have heat resistance, elasticity, or releasability. Have been. Both ends of the hollow roller 1 are supported by roller bearings 5, and the hollow roller 1 is mounted on a roller mounting movable member 6 and rotates.

The outer tube member 3 of the hollow roller 1 needs to have a wall thickness of 5 mm or more, preferably 10 mm or more for a practical roller length of about 100 mm in order to obtain the pressure resistance. If the thickness is 100 mm or more, the roller itself becomes heavy, and the roller bearing portion 5 and the roller mounting movable member 6 become thicker.
Not only is a burden on the user, but also it takes time to reach the set temperature, which deteriorates the workability. The thickness of the inner pipe member 2 is 5
It is appropriate that the thickness of the elastic member 4 is about 0.1 to 5 mm.

A rod-shaped heating element 7 is inserted into the hollow portion of the hollow roller 1 and fixed by a heating element fixing jig 8. Although the heating element 7 is not shown in the figure, a power supply provided outside,
It is electrically connected to the temperature control circuit. The heating element 7 incorporates an electric resistor such as a nichrome wire, and generates heat when energized. In order to keep the gap between the heating element 7 and the hollow roller 1 constant, heater bearings 9 are appropriately provided at both ends thereof.

For example, the hollow roller 1 has a three-layer structure such as copper on the inside, aluminum on the middle, and iron on the outside.

[0015]

Next, an embodiment of the present invention will be described. The inner tube member of the hollow roller has an outer diameter of 40 mm and an inner diameter of 22 m
m, made of copper having a length of 800 mm, and the outer tube member of the hollow roller is made of iron having an outer diameter of 83 mm, an inner diameter of 40 mm, and a length of 900 mm including a shaft, and is provided with a 3 mm thick silicon rubber baked layer on the surface. . The heating element has an outer diameter of 20 mm,
The one with a heating effective length of 740 mm is used.

Next, with respect to the examples of the present invention, a heating distribution test was carried out at a set temperature of 110.degree. As a result, the temperature difference between the central portion of the roller surface of the present invention and the portion 300 mm away from the center was 3 ° C., but the hollow roller tube member was made only of iron and the other specifications were the same as those of the embodiment. The temperature was 9 ° C. for the structured roller.

[0017]

As described above, according to the present invention, the structure is simple, easy to assemble and maintain, and has the strength to reliably perform thermocompression bonding even if there are some irregularities, and it is easy to adjust the temperature. In addition, it is possible to provide a thermocompression bonding roller capable of performing uniform bonding over a wide area and having a high temperature distribution uniformity.

[Brief description of the drawings]

FIG. 1 shows a sectional view of an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Hollow roller, 2 ... Inner tube member, 3 ... Outer tube member, 4
... Elastic member 5 ... Roller bearing part 6 ... Roller mounting movable member 7 ... Heating element 8 ... Heating element fixing jig 9
... heater bearing part.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroyuki Inoue 1065 Kusoda, Ninomiya-cho, Haga-gun, Tochigi Prefecture Inside the Haga Plant of Hitachi AIC Co., Ltd. F-term (reference) in the Haga factory of AIC Co., Ltd. AD03 AD05 AD08 AG01 AG03 AH36 AJ02 AJ09 SA07 SC06 SD01 SD11 SH06 SP06 SP37

Claims (2)

[Claims] 1. A heating roller having a hollow roller and a fixed heating element in the hollow, wherein the hollow roller has at least a double structure, and an inner tube member of the hollow roller is the hollow tube. A thermocompression roller comprising a member having a higher thermal conductivity and linear expansion coefficient than an outer tube member of the roller. 2. A heating roller having a hollow roller and a fixed heating element in the hollow, wherein the hollow roller has at least a double structure, and an inner tube member of the hollow roller is copper; An outer tube member of the hollow roller is made of iron or stainless steel.