JPH0347564A - Method for uniformly sprinkling particulate material and preparation of laminated steel plate using the same - Google Patents

Abstract

PURPOSE:To uniformly apply a particulate material in a stable state by supplying to the rotary roll the particulate material in the supply port which is provided above a rotary roll to charge the same in the small holes of said roll, and allowing the particulate material outside the small holes to fall to a flat plate coated with a liquid resin. CONSTITUTION:A liquid resin is applied to a lower steel plate S2 by a sprayer 7 and, subsequently, a conductive filler is uniformly applied to the resin coated surface by a rotary roll 8 rotating at a constant speed. Next, the steel plate S2 passes through a drying apparatus 3 to be dried and goes toward a press bonding roll 4. An upper steel plate S1 is delivered from an uncoiler 1 to pass through a preheating apparatus 5 and heated to predetermined temp. to go toward the press bonding roll 4. The steel plates S1, S2 are superposed in such a state that the resin coated surfaces thereof are turned inwardly by the press bonding roll and bonded under pressure to become a laminated steel plate S3. By this method, a homogenous weldable laminated steel plate is obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention mainly relates to the use of liquid adhesives that serve as the core material of composite steel plates when forming composite steel plates (laminated steel plates) such as damping steel plates and lightweight steel plates. The present invention relates to a method for uniformly dispersing powder and granules to uniformly supply a conductive filler for imparting resistance weldability to a composite steel sheet onto a resin layer, and a method for manufacturing a laminated steel sheet using the same.

[Conventional technology]

As a reweldable laminated metal plate in which a resin layer as an adhesive containing conductive metal powder is interposed between two metal plates, for example, the one disclosed in JP-A-60-912 is known. It is being

The configuration line of such a conventional method for manufacturing a re-weldable laminated metal plate is illustrated as a conceptual diagram as shown in FIG. That is, the two metal plates SI and S2 are discharged from the uncoilers 1 and 1, respectively, and a slurry containing a mixture of conductive filler and liquid resin is sprayed onto the surface of the metal plate S2 facing the metal plate S+ through a spray nozzle or the like. It is spray-coated by a coating device 2 having a drying device 3, and then goes to a pressure roll 4 via a drying device 3. Further, one metal plate Sl goes to a pressure bonding roll 4 via a preheating device 5, and the metal plate S1 is heated by this pressure bonding roll 4.
2 and the slurry sandwiched therebetween and are laminated to form a laminated steel plate S3, which is wound up by a winding machine 6.

The solid conductive filler used here generally has a large specific gravity and a particle size of about 50 to 100 μm. Also, the viscosity of liquid resin is not very high (100-200 cP).

A certain degree is used.

[Problem to be solved by the invention]

In the conventional example described above, it is somewhat difficult to mix the solid filler with the liquid resin and spray it onto the metal plate using a spray nozzle or the like. That is, first, a solid conductive filler with a large specific gravity is injected into an injection device, or a mixing device for mixing liquid resin and conductive filler prepared upstream thereof.
Or the control valve that should control the flow rate may become clogged.
Alternatively, the conductive filler could settle into tanks or pipes. This has made it difficult to uniformly and stably apply a resin containing a conductive filler onto a metal plate.

This invention was made in view of such conventional problems, and instead of mixing a conductive filler and a liquid resin in advance, for example, after coating a liquid resin on a metal plate, a conductive filler and a liquid resin are applied. The purpose of this invention is to solve the above problems by using a method of uniformly dispersing filler.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention has provided that a large number of small holes, each having a size of 1.0 to 1.5 times the size of the granular material, are uniformly formed in the granular material in the supply port provided above the rotating roll. The powder and granules outside the small holes are fed to a rotating roll with holes perforated on the entire surface and charged into the small hole at a certain density, and the powder and granules outside the small hole are rotated at a constant speed while being prevented from falling by a blade installed close to the rotating roll. In order to apply this method specifically to the production of laminated steel sheets, we have developed a method for uniformly dispersing powder onto a flat plate whose surface is coated with liquid adhesive as it moves at a constant speed below a rotating roll. The conductive filler in the supply port provided above the roll is supplied to a rotating roll with a large number of small holes 1.0 to 1.5 times the size of the filler perforated on the entire surface at a uniform density. The conductive filler outside the small holes is prevented from falling by a blade close to the rotating roll, and the liquid adhesive is applied to the surface moving at a constant speed below the rotating roll. The liquid adhesive is applied by dropping it onto a coated steel plate to spread it evenly, and then stacking another steel plate on top of the steel plate and crimping it so that the surface coated with the liquid adhesive is on the inside. be.

[Effect]

This invention has the above-mentioned structure, so that the powder particles charged from the supply port as the rotary roll rotates into a large number of small holes drilled at a uniform density over the entire surface of the rotary roll. As the rotating roll rotates at a constant speed, the bodies fall at a uniform density onto a flat plate that moves at a constant speed below the rotating roll, and are uniformly dispersed.

In addition, in the above method, if a conductive filler is used as the powder, a steel plate is used as the flat plate, and a liquid resin is used as the liquid adhesive, the above method and the (Similarly, the conductive filler can be uniformly distributed. Then, stack another steel plate on top of this steel plate so that the surface coated with liquid side fat is on the inside, and press the two steel plates together to form a conductive filler.) A laminated steel sheet containing filler at a uniform density can be obtained.

Furthermore, the size of the small holes drilled on the surface of the rotating roll was set to be 1.0 to 1.5 times the size of the powder and granules. This is because if it exceeds 1.5, there is a high possibility that multiple particles will be mixed in, making uniform dispersion impossible.

〔Example〕

Hereinafter, the present invention will be explained with reference to the drawings. Figures 1 to 4
The figure is a diagram illustrating an embodiment of the present invention. Note that the same parts as in the conventional example are given the same reference numerals, and redundant explanation will be omitted.

FIG. 1 is a conceptual diagram of the configuration of an embodiment according to the present invention,
The lower steel plate St, which is discharged at a constant speed by the uncoiler 1, is first coated with a thin layer of liquid resin by a sprayer 7, and then a conductive filler (powder) is applied to the resin by a rotating roll 8 rotating at a constant speed. Spread evenly over the coated surface. Subsequently, the steel plate S2 passes through the drying device 3, is dried to some extent, and then heads to the pressure roll 4. On the other hand, the upper steel plate SI
is discharged from the uncoiler 1, passes through a preheating device 5, is heated to a predetermined temperature, and then heads to the pressure roll 4. With this pressure roll 4, the steel plates S and S2 are overlapped and crimped with the resin coated surfaces inside, thereby forming a laminated steel plate S.
, and is wound up by the winding machine 6.

FIG. 2 is a perspective view of the rotary roll 8 shown in FIG. 1, and the entire surface of the roll body 9 is provided with a large number of small holes 9a at a uniform density. Reference numeral 10 denotes a blade, which is disposed so as to maintain an extremely small slit b (approximately 115 to 1/10 of the particle diameter) between the blade and the surface of the roll body 9, so that the powder and the particles outside the small holes 9a are cannot fall through this slit b. Reference numeral 11 denotes a partition plate, the lower edge of which is disposed between the surface of the roll body 9 and a slit a large enough to allow a single layer of granular material arranged approximately one grain at a time to pass through. The plate 11 and the blade 10 form a powder supply port 12.

FIG. 3 is a cross-sectional view taken along the line ■-■ in FIG. 2, and the powder 13 in the supply port 12 invaginates one after another into the small holes 9a of the roll body 9 as the roll body 9 rotates. At the same time, when the small holes 9a rotate in the direction of arrow A to near the horizontal diameter of the roll body 9, they fall one after another and are uniformly scattered on the resin film 14 of the steel plate S2 moving at a constant speed in the direction of arrow B. That is, since the small holes 9a are formed at a uniform density over the entire surface of the roll body 9, by controlling the rotation speed of the roll body 9 to a constant number and also controlling the running speed of the steel plate St to a constant value, It becomes possible to scatter the granular material 13 on the steel plate S2 at an arbitrary constant density.

In the case of highly adhesive particles, it is also effective to apply a slight vibration using a vibrator 15 (for example, ultrasonic vibration) near the dispersion point, as shown in FIG.

In addition, as shown in FIG. 4, which is a partially enlarged view of FIG. 3,
The size of the small hole 9a is d, which is the representative particle size of the powder 13, and the small hole 9a.
If the representative diameter of a is D, it is formed so that D is in the range of 1.0d to 1.5d, and since an inclined surface is formed in the direction of rotation of the roll body 9, it is slightly affected by its own weight. The falling direction of the powder and granules subjected to centrifugal force remains constant. Further, the size of the small hole 9a is limited as already explained in the [Function] section.

FIG. 5 is a cross-sectional view of another embodiment of the small hole 9a, and FIG. 5(a) shows a semicircular shape, and FIG.
is a trapezoid (truncated cone), and (C) is a triangle (cone)
Although the smoothness of the fall is slightly inferior to that of this embodiment, the formation is somewhat easy.

〔Effect of the invention〕

As explained above, according to the present invention, a homogeneous re-weldable laminated steel plate can be obtained by, for example, coating a steel plate with a liquid resin and then dispersing a conductive filler using a uniform dispersion means.

[Brief explanation of drawings]

Fig. 1 is a line configuration conceptual diagram of an embodiment of the present invention, Fig. 2 is an enlarged perspective view of the rotating roll in Fig. 1, Fig. 3 is a sectional view taken along the line ■-■ in Fig. 2, and Fig. 4 is a Figure 3 is a partially enlarged view, Figures 5 (a), (b), and (C) are examples of small holes forming various cross-sectional shapes of the rotary roll body, and Figure 6 is a conceptual diagram of the line configuration of a conventional example. be. 8...Rotating roll, 9a...Small hole, 1
0... Blade, 12... Supply port, 1
3... Powder (conductive filler), 14...
...Liquid adhesive (liquid resin), 52 (0) ... Steel plate, ... Laminated steel plate.

Claims (2)

[Claims] (1) Powder in the supply port provided above the rotating roll,
The granules are supplied to a rotating roll having a large number of small holes 1.0 to 1.5 times the size of the granules perforated on the entire surface with a uniform density, and charged into the small holes. The powder and granular material is prevented from falling by a blade close to the rotating roll, and is allowed to fall onto a flat plate whose surface is coated with liquid adhesive, which moves at a constant speed below the rotating roll that rotates at a constant speed. Method for uniformly dispersing powder and granules. (2) A rotating roll in which the conductive filler in the supply port provided above the rotating roll has many small holes 1.0 to 1.5 times the size of the filler at a uniform density on the entire surface. The conductive filler is supplied to a roll and charged into the small hole, and the conductive filler outside the small hole is prevented from falling by a blade close to the rotating roll, while the surface moves at a constant speed below the rotating roll that rotates at a constant speed. It is distributed evenly by dropping it onto a steel plate coated with a liquid adhesive, and then layered by stacking and pressing another steel plate on top of the steel plate so that the surface coated with the liquid adhesive is on the inside. A method for manufacturing a laminated steel sheet, characterized by: