JP3003059U - Roll coater equipment - Google Patents

Abstract

(57) [Summary] [Purpose] A device that prevents the work from sticking to the main roller by a simple method and shortens the time even if it sticks to reduce the thermal and physical stress on the work. The purpose is to provide. Still another object is to provide an apparatus for reducing the defect rate due to the roll coater process even when a flat plate such as an optical disk substrate that requires high flatness and optical uniformity is used as a work. Especially. A main roller for applying a pressure-sensitive adhesive or an adhesive to a flat plate-shaped work while rotating while holding it on the surface, means for feeding the work below the main roller, means for unloading the work from below the main roller, and the work Roll coater device provided on the exit side from below the main roller of

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a roll coater device, and more particularly to a roll coater device suitable for applying a pressure sensitive adhesive or an adhesive to a flat plate-like object such as an optical disk substrate that requires high flatness or optical uniformity.

[0002]

[Prior art]

 In order to bond two flat plates together, a method is used in which an adhesive or an adhesive is applied to each flat plate in advance, and then both flat plates are pressure bonded. A roll coater device is often used to apply an adhesive or an adhesive to the flat plate, and for example, the device shown in FIG. 4 is generally used. FIG. 4 is a diagram of a portion related to a coating operation of a conventional roll coater device. The hot-melting agent as a coating agent is heated and melted by the melting tank heater 2 in the melting tank 1, flows into the surface of the main roller 6, and is rotated on the surface of the main roller 6 by the rotation of the main roller 6 and the doctor blade 4 on the supply side. Formed in layers of thickness. At this time, the hot-melting agent on the surface of the main roller 6 is kept in a molten state by the heater 3 embedded in the main roller. A flat plate-like work 11 as a material to be coated is conveyed by the supply-side conveyor 8 and fed between the main roller 6 and the under roller 7. Then, the hot melt agent on the surface of the main roller 6 is applied by being transferred onto the work 11 and is further sent out onto the discharge side conveyor 9.

In this operation, for example, when the work is light and the adhesive force of the hot melt agent is large, when the work comes out from between the rollers, the rear end of the work 11 is partially attached to the main roller 6. The work may come out in a picked-up state, or the force of the main roller 6 may be applied to the rear end of the work, and as a result, the work may float from the carry-out side conveyor.

[0004]

[Problems to be solved by the device]

 When the work is stuck to the main roller 6 as described above, the contact time between a part of the work and the heated main roller becomes long, and a part of the work is additionally affected by heat. In addition, the stress applied due to its own weight may differ between the adhered part and the non-adhered part, and uneven strain remains. Further, the lifted work is then separated from the main roller and drops onto the carry-out side conveyor 9, but the work may be distorted by the impact at that time.

The influence of such heat or strain increases the defect rate when a flat plate such as an optical disk substrate that requires high flatness and optical uniformity is used as a work. One of the characteristics required of the optical disk is that the axial acceleration is small. If the axial acceleration is large, the servo mechanism that focuses the laser beam on the recording surface of the optical disk cannot follow and normal recording and reproduction cannot be performed. Therefore, it is required to be as small as possible. The cause of the large axial acceleration may be waviness, distortion, and optical non-uniformity of the optical disk substrate, but this axial acceleration may become large during the hot melt coating process using a roll coater.

By the way, as a method for preventing the work from sticking to the main roller, some techniques described below are known. According to Japanese Utility Model Laid-Open No. 62-62866, a crossover wire is provided along the peripheral surface of the coating roll from the tip of the work loading table to the coating liquid tank, but it is difficult to use when coating the work surface uniformly. . In Japanese Patent Laid-Open No. 58-76159, the work is vacuum-sucked and conveyed, but the apparatus becomes complicated accordingly. In Japanese Patent Laid-Open No. 63-12367, high-pressure air is blown between the roller and the work, and in Japanese Laid-Open Patent Publication No. 55-33390, a doctor blade operated by a piston and high-pressure air are blown to prevent sticking. However, all of them are for thin work pieces, and ancillary equipment is required, resulting in a large scale of equipment.

In order to solve the above problems, the present invention prevents the work from sticking to the main roller by a simple method, and even if it sticks, the time can be shortened as much as possible and the work can be thermally and physically treated. An object of the present invention is to provide a device for reducing physical stress. Another object of the present invention is to reduce the defect rate caused by the roll coater process even when a flat plate such as an optical disk substrate that requires high flatness and optical uniformity is used as a work. To provide a device.

[0008]

[Means for Solving the Problems]

 The present invention relates to a main roller that holds an adhesive or an adhesive on the surface and applies it to a flat plate-like work while rotating, a means for feeding the work below the main roller, and a means for carrying out the work from below the main roller. , And an obstacle to the upward movement of the work provided on the exit side of the work from the lower side of the main roller and directly above the means for carrying out the work from the lower side of the main roller.

The means for feeding the work below the main roller and the means for unloading the work from the bottom of the main roller are not limited as long as the work can be moved, such as a belt conveyor and a roller conveyor. . Further, the obstacle against the upward movement of the work is provided near the exit from the lower side of the main roller of the work and immediately above the unloading side conveyor. Furthermore, examples of obstacles to the ascending movement of the work include a long object installed almost parallel to the rotation axis of the main roller, and a projection with a thin tip attached near the center in the length direction. However, this may be point contact with the work at one or several points, or line contact or surface contact. Further, the shape thereof can be arbitrarily selected such as a rod shape, a plate shape, or a shape in which projections are provided for reducing the contact area with the work. Further, the projection with a thin tip may be annular like a abacus ball, and may have play that allows it to rotate around a long object.

[0010]

[Action]

 The work conveyed below the main roller has the adhesive or adhesive on the surface of the main roller transferred to the work surface and is carried out from below the main roller. At that time, when the work sticks to the main roller and the tip of the work floats up from the carry-out conveyor, part of the tip comes into contact with the obstacle against the ascending movement, and further work is prevented from rising. Since the main roller continues to rotate, a deviation occurs at the point of attachment between the main roller and the work, and the work is separated from the main roller and is carried on the carry-out conveyor. At this time, the work falls a little height, but the influence of the fall can be reduced by adjusting the height of the obstacle against the ascending movement.

[0011]

【Example】

 (Embodiment) One embodiment of the roll coater according to the present invention is shown in FIGS. This equipment melts the hot melt agent and sends it to the main roller, the melting tank 1, the heater 2 that is embedded in the side wall of the melting tank to melt the hot melt, and the main roller 6 that holds the melted hot melt on the surface and the A means for separating the work from the main roller on the exit side of the work, having a main roller heater 3 for heating, a supply side conveyor 8 for feeding the work 11 below the roller, a discharge side conveyor 9 for drawing out the work from below the roller, and an under roller 7. As an obstacle, the obstacle bar 10 having two thin annular protrusions 12 is provided directly above the carry-out side conveyor. An example of the obstacle rod 10 is shown in FIG. This is a rod 13 which is a long object and which is attached with an annular projection 12 having an abacus bead shape having a thin tip. Further, this apparatus has a doctor blade 4 on the supply side for aligning the melted hot melt agent on the surface of the main roller to a certain thickness and a doctor blade 5 on the recovery side for collecting the residual hot melt after the transfer to the work 11. There is.

Next, the hot melt coating process on the surface of an optical disk single plate using this apparatus will be described. In the hot melt melting tank 1, the hot melt agent heated and melted by the melting tank heater 2 flows into the surface of the main roller 6, and the surface of the main roller 6 has a constant thickness due to the rotation of the main roller and the doctor blade on the supply side. Layers are formed. At this time, the hot-melt agent on the surface of the main roller 6 is maintained in a molten state by the main roller heater 3. The optical disk single plate 11 is conveyed here by the supply side conveyor 8 and fed between the main roller 6 and the under roller 7. Then, the hot melt agent on the surface of the main roller 6 is applied by being transferred onto the optical disk veneer 11 and sent out to the discharge side conveyor 9 of the optical disk veneer 11. At this time, a part of the rear edge of the optical disk veneer sticks out to the main roller and comes out, so that it slightly floats on the unloading side conveyor. When the floating height reaches a certain height, it hits the obstacle bar 10 and is pulled away from the main roller and falls on the unloading side conveyor. By adjusting the position and height of the obstacle with respect to the ascending movement, it is possible to make the impact when the optical disk single plate hits it and the impact when it falls on the unloading side conveyor to a negligible level. .

When the axial acceleration was measured for 1600 optical disks in which the hot-melting agent was applied by the apparatus according to the present embodiment and the two optical disks were bonded in the subsequent process, none of them exceeded 10 m / sec 2. In this embodiment, the under roller is provided in pair with the main roller, but other means such as a belt conveyor may be used instead of the under roller. (Comparative Example) Next, when the same experiment was performed without using the obstacle 10 against the ascending movement in the apparatus of the above-described example, a large floating optical disk substrate stuck to the main roller was considerably generated. Further, in the subsequent process, the axial acceleration of 49 (3.5%) optical discs out of 1400 optical discs laminated two by two exceeded 10 m / sec 2.

[0014]

[Effect of device]

 According to the present invention, the work to which the adhesive or the adhesive has been transferred can prevent the upward movement of the work due to the sticking of the work and the roller when coming out of the roller, and the time can be shortened even if the work is stuck. As a result, an extra heat history is not given to the work, and the height at which the work floats up can be reduced, so that the impact on the work due to the drop can be reduced.

Further, when the apparatus according to the present invention is used in the hot-melt coating process of the optical disk substrate, it is possible to reduce the defect rate regarding the magnitude of the axial acceleration, which is one of the important characteristics of the optical disk.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a roll coater apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic plan view of a roll coater apparatus according to an embodiment of the present invention.

FIG. 3 is a perspective view of a work and a main roller separating means according to an embodiment of the present invention.

FIG. 4 is a schematic sectional view of a conventional roll coater device.

[Explanation of symbols]

 1 Hot Melt Agent Dissolving Tank 6 Main Roller 7 Under Roller 8 Supply Side Conveyor 9 Carry Out Side Conveyor 10 Obstacle to Upward Movement 11 Workpiece (Optical Disc Substrate)

Claims (3)

[Scope of utility model registration request] 1. A main roller for applying a pressure-sensitive adhesive or an adhesive to a flat plate-like work while rotating while holding it on the surface, means for feeding the work below the main roller,
A means for unloading the work from below the main roller, and an obstacle to the upward movement of the work provided on the exit side of the work from below the main roller and directly above the means for unloading the work from below the main roller. A roll coater device characterized in that 2. The obstruction to the upward movement of the work is a long object provided substantially parallel to the rotation axis of the main roller, and a projection with a thin tip attached near the center in the longitudinal direction. The roll coater apparatus according to claim 1, wherein the roll coater apparatus comprises: 3. An elongated object in which the obstacle against the upward movement of the work is provided substantially parallel to the rotation axis of the main roller, and a soroban ball with a thin tip attached near the center in the longitudinal direction. The roll coater device according to claim 1, comprising a ring-shaped object.