JPH10128871A - Sealing tape manufacturing method, rectangular sheet cutting method, and roll-shaped cutter - Google Patents

Abstract

(57) Abstract: A long sealing tape made from an unvulcanized rubber base material is obtained. A method for producing a sealing tape, comprising: a material producing step for producing a sealing tape material containing a rubber base material and a vulcanization accelerator; and a square sheet in which the sealing tape material remains unvulcanized. Processing process to process into
An adhesive bonding step of bonding an adhesive sheet having an adhesive applied to the bottom surface of the square sheet, and moving the square sheet on the upper surface side thereof, a plurality of pieces along a cylindrical circumference. A cutting step of pressing a roll-shaped cutting device having an arc-shaped recess formed between the blades and the blades, and cutting the rectangular sheet into a tape while shaping it into a long shape having a thickness with respect to a bottom surface. And obtaining an unvulcanized sealing tape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a sealing tape, and more particularly to a method for manufacturing a tape for covering a metal surface or a joint between metal plates and a metal plate inside a body of an automobile, and a joining step. The present invention relates to a method for cutting a rectangular sheet used in a manufacturing method and a roll-shaped cutter used at that time.

[0002]

2. Description of the Related Art Water or dust is prevented from entering a joint between a metal plate and a metal plate inside a vehicle body, a joint of a body panel which is a step portion of a joint, and a hemming portion such as a door or a hood. For this reason, a sealing agent is applied so as to have a thickness along a bonding portion or a bonding step portion. That is, for example, as shown in FIG. 9, the bent portion C of the outer metal plate A having the bent portion C formed at the end portion.
When the inner metal plate B is inserted and joined to the tube, the joining step portion D extending in the front and back direction in the figure is covered with the sealing agent E extruded from the nozzle at the tip of the tube in a band shape in the front and back direction. Since the operation of applying the sealing agent E is performed by an industrial robot in an automobile manufacturing process, the amount of the sealing agent extruded from the nozzle and the moving distance of the nozzle can be controlled with high precision, and the sectional shape of the applied sealing agent E can be controlled. Can be kept constant in the shape shown in FIG. 9, after which a painting operation is performed.

[0003] When the joint of the body panel is deformed due to an impact applied to the automobile or the like, it is required to repair the portion to restore the original appearance.

At the time of repair painting of such an automobile body, after repairing the shape of the joint of the body panel, an operator operates a nozzle at the tip of a metal tube filled with a sealing agent, for example. The sealing agent is extruded from the tube while being pressed directly to the seam of the body to be applied, and is moved along the seam to apply the sealing agent. That is, the work by the industrial robot described above is performed by human hands.

According to the manual operation, the operation of moving the tube while pushing out the sealing agent in the tube makes it difficult to keep the amount of the applied sealing agent constant even with the utmost care. And
Further, the locus was disturbed, so that the coating state could not be finished smoothly. Therefore, there is a problem that the state of the new vehicle (the state shown in FIG. 9) cannot be maintained at the joint of the body panel after the repair.

[0006]

SUMMARY OF THE INVENTION Accordingly, the inventor of the present invention proposes a sealing tape which can extremely easily seal a joint of a panel when repairing a body of an automobile and has a good finished state. Reached. This sealing tape 10, as shown in FIG.
Make a long shape with a thickness to the bottom with a step,
It is formed by vulcanizing a rubber base material so as to retain its original shape with resilience, and is used by sticking to a joining step portion of a metal plate (see Japanese Utility Model Application No. Hei 6-7363).

According to the sealing tape of this shape, for example, as shown in FIG. 7, a first metal plate A having a bent portion C at an end portion, and one end of the bent portion C of the metal plate A When covering the joining step portion D with the inserted second metal plate B, the sealing tape 10 is placed along the seam of the metal plate.
The first bottom surface portion 11 which is the back surface on the side of the curved portion 14 is provided on the metal plate A, and the second bottom surface portion 1 which is the back surface on the side of the flange edge 15.
2 is bonded so as to adhere to the metal plate B. Therefore, the first bottom surface portion 11 and the second bottom surface portion 12 are accurately adhered to the joining step portion D at the joint between the metal plate A and the metal plate B, and exhibit a sealing effect at that portion. be able to.

However, the sealing tape 10
For example, as shown in FIG. 6 (FIG. 6 shows a part of the rear door of the automobile (with the lining removed)) as shown in FIG. It is necessary to bend the tape itself at a substantially right angle along the door shape (corner part G) and stick it. In such a case, a phenomenon occurs in which the tape sags or a part of the tape peels off at the corner portion G, and there is a problem that the finished state is deteriorated. In order to improve the finished state, it was necessary to manually apply the sealing agent described in the conventional example only to this portion (corner portion).

This is because when the sealing tape is produced, the rubber base is vulcanized so as to retain the original shape with resilience in a long shape. In general, rubber base materials are usually used after being vulcanized to maintain a certain shape, and in the unvulcanized state, they are easily deformed when pressure is applied. Is not suitable for a sealing tape in which it is important to maintain the shape of the tape.

Therefore, the sealing tape is improved,
It has been proposed to provide a sealing tape that can be freely deformed even when bent by being in an unvulcanized state (hereinafter referred to as an unvulcanized sealing tape). When this unvulcanized sealing tape is used, it is vulcanized by a heat treatment during the coating process, and retains its shape, for example, in a bent state.

On the other hand, the unvulcanized sealing tape cannot be manufactured by the same method as that of the previous sealing tape (vulcanized sealing tape) due to its properties. In other words, in the case of a method for producing a vulcanized sealing tape, a rubber base vulcanized into a cylindrical body having a hole having the same cross-sectional shape as the sealing tape on the bottom surface (at this time, the rubber base is in a high temperature state, (Which can be deformed) and extrude a rubber base material from the hole with a piston to form a long sealing tape.
However, when an unvulcanized rubber base material is used, the rubber base material extruded from the holes cannot maintain a constant shape, and thus cannot be formed into a long sealing tape.

The present invention has been made in view of the above circumstances, and a method for producing a long sealing tape (unvulcanized sealing tape) produced from an unvulcanized rubber base material, and a method for producing the same. It is an object of the present invention to provide a method for cutting a rectangular sheet used in the above, and a roll-shaped cutter used at that time.

[0013]

According to a first aspect of the present invention, there is provided a method of manufacturing a sealing tape, comprising the following steps. Material production process. In this material producing step, a sealing tape material is produced by containing a rubber base and a vulcanization accelerator. Processing steps. In this processing step, the sealing tape material is processed into a rectangular sheet in an unvulcanized state. Adhesive sticking process. In the adhesive bonding step, an adhesive sheet coated with an adhesive is bonded to the bottom surface of the rectangular sheet. Cutting process. In this cutting step, at least two or more blades and a roll-shaped cutter having a recess formed between the blades are pressed on the upper surface side of the rectangular sheet while moving the rectangular sheet along its circumference. Then, the rectangular sheet is cut into a tape shape while shaping it into a long shape having a thickness with respect to the bottom surface to obtain a sealing tape.

According to a second aspect of the present invention, in the manufacturing method of the first aspect, the concave portion of the roll-shaped cutter is formed in an arc shape, so that the upper surface of the sealing tape becomes a curved portion. It is characterized by.

According to a third aspect of the present invention, there is provided a method of manufacturing a sealing tape, comprising:
It is characterized by adding an antioxidant.

According to a fourth aspect of the present invention, there is provided a cutting method for cutting a rectangular sheet formed of a deformable material, wherein the rectangular sheet is moved at least along a cylindrical circumference on an upper surface thereof. Pressing a roll-shaped cutter with two or more blades and a recess formed between these blades, cutting the rectangular sheet into a tape while shaping it into a long shape with a thickness against the bottom surface It is characterized by doing.

According to a fifth aspect of the present invention, there is provided a roll-shaped cutter in which a blade is formed on a surface of a cylindrical body, wherein a plurality of the blades are formed along the circumference, and the blades are continuously formed between the blades with the blades at the tops. It is characterized in that an arc-shaped concave portion is formed.

According to the method of the present invention, a long sealing tape is obtained by shaping and cutting by pressing the roll-shaped cutter while moving the rectangular sheet.

Further, by forming the concave portion of the roll-shaped cutter into an arc shape, the upper surface of the sealing tape can be formed into a shape suitable for the sealing tape as a curved portion.

By adding an antioxidant in the material producing step, the aging of the unvulcanized sealing tape can be suppressed.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method of the present invention will be described with reference to the drawings. FIG. 5 is an explanatory perspective view of a sealing tape manufactured by the method of the present invention. The entirety of the sealing tape 10 is formed by adding a vulcanization accelerator, an antioxidant, a pigment, and an extender to a rubber base material. The sealing tape 10 has a flat bottom 1
The curved surface 2 having a thickness with respect to the bottom surface 1 forms an arc-shaped cross section, and is formed to be sufficiently long in a direction perpendicular to the cross section. Sealing tape 1
The adhesive sheet 3 is adhered to the bottom surface 1 of the O, and the protective tape 4 is adhered to the surface side thereof, thereby maintaining the shape of the sealing tape 10 in an unvulcanized state.
Therefore, the tape can be wound and stored in a state before the sealing tape 10 is attached to the metal plate (a state before use).

Next, a method for manufacturing the sealing tape 10 will be described. That is, as shown in FIG. 1, the sealing tape 10 is, as shown in FIG. 1, a material producing step 100 for producing a sealing tape material, a processing step 200 for processing the material into a square sheet, and an adhesive is applied to the square sheet. It is manufactured through an adhesive bonding step 300 and a cutting step 400 of cutting a square sheet to obtain a plurality of sealing tapes.

In the material producing step 100, a vulcanization accelerator, an antioxidant, a pigment and an extender are added to the rubber base material in the hopper 101, and stirring is performed to produce a sealing tape material. In the hopper 101, the temperature of the sealing tape material is about 50 ° C.

The vulcanization accelerator is used to vulcanize the rubber base material by performing a heat treatment and to maintain its original form with resilience. For example, sulfur oxide is used. A characteristic part of the present invention is that the vulcanization treatment is performed by a heat treatment during the coating treatment, and the sealing tape itself before being attached to the metal surface is in an unvulcanized state. The antioxidant is added to suppress aging of the uncured sealing tape, and for example, polybutene is used.

The pigment is used to color the sealing tape into a desired color, and for example, titanium oxide is used.
The extender is used to increase the volume of the mixture mainly composed of the rubber base and to increase the strength of the rubber base. For example, calcium carbonate is used.

The processing step 200 is for processing the sealing tape material into a rectangular sheet 201 in an unvulcanized state. That is, the sealing material is supplied from the hopper 101, and is supplied to the pair of cylindrical rolls 202, 202.
It is pressed between and processed into a square sheet 201. The unvulcanized state in this case is a state in which this shape (deformed shape) can be maintained when the sealing tape material is deformed, and is in a semi-vulcanized state (vulcanization that satisfies this condition). Stopped on the way). The bottom surface of the pressed rectangular sheet 201 is a flat surface or a gentle arc-shaped surface in a direction perpendicular to the flow direction.

In a subsequent adhesive bonding step 300, an adhesive is applied to both sides, and a protective tape is bonded thereon, and the protective tape 302 on one side is peeled off from the adhesive sheet 301 wound on a roll. Then, the adhesive sheet 301 is attached to the bottom surface of the square sheet 201. This adhesive sheet 3
01 is to maintain the shape of the square sheet 201,
It must be performed immediately after the processing step. Further, by sticking the adhesive sheet 301, even when the square sheet 201 is in an unvulcanized state, it is possible to maintain its shape in a sheet shape. Therefore, the square sheet 201 can be stocked by winding up the square sheet 201 without immediately performing the next step after the adhesive bonding step.

In the next cutting step 400, as shown in FIGS. 1 and 2, while moving the rectangular sheet 201 on the base 410, a plurality of blades are formed on the upper surface thereof along a cylindrical circumference. The roll-shaped cutting device 401 on which the sheet 402 is formed is pressed while rotating in the sheet flow direction (the direction of the arrow in the roll-shaped cutting device 401 in FIG. 1), and the square sheet 201 is pressed.
Is cut into a tape shape to obtain a plurality of sealing tapes 10 at the same time. That is, as shown in FIG. 3, between the plurality of blades 402 formed along the circumference of the roll-shaped cutter 401, an arc-shaped concave portion 403 that is continuous with the blade 402 as a top is formed. When cutting the rectangular sheet 201, the sealing tape 1 is formed into a long shape having a curved upper surface and a thickness with respect to the bottom surface.
0 is obtained. The bottom surface of each sealing tape 10 is a flat or gentle arc-shaped surface in a direction orthogonal to the long direction.

The maximum depth h of the arc-shaped concave portion 403 in the roll-shaped cutter 401 is set to be larger than the thickness d of the rectangular sheet 201 as shown in FIG. Therefore, when the square sheet 201 is pressed by the roll-shaped cutter 401, a portion (square portion X) whose cross section is cut by the blade 402 becomes a portion (arc portion Y) where the cross section becomes an arc shape. So that the cross-sectional shape is adjusted. The area of the arc-shaped portion Y is set to be slightly larger than the area of the square portion X so that there is no protruding portion of the material (rubber base material) constituting the square sheet 201 from the arc-shaped concave portion 403 during shaping. .

According to the above manufacturing method, the square sheet 201
Is cut while being shaped by pressing the roll-shaped cutter 401 while moving from left to right in the figure, so that a long sealing tape in an unvulcanized state can be obtained. In the above example, the concave portion 403 of the roll-shaped cutter 401 is formed in an arc shape. However, by deforming this shape, the upper surface of the sealing tape 10 can be shaped into a desired shape.

The sealing tape obtained by the above manufacturing method is
Used to cover the joint between metal plates. In other words, in the joint portion where the side portions of the metal plates are in contact with each other, by sticking along the joint portion on one surface side, it is possible to prevent water and dust from entering from the joint portion on the other surface side and to seal. The effect can be obtained. At this time, even when the sealing tape is adhered while being bent, it can be easily deformed because it is in an unvulcanized state, and the shape is maintained unless it is newly deformed (no force is applied).

The vulcanization of the sealing tape is carried out from above the sealing tape by a coating treatment of a body color. That is, in this coating treatment, a coating film is formed by a coating spray, and then forced drying (thermal reaction treatment) for stabilizing the coating film is performed. This forced drying (thermal reaction treatment)
Is carried out in a coating booth at 70 ° C. for 30 minutes or more, so that the sealing tape 10 can be vulcanized by this treatment (heating treatment during the coating treatment), and even when a force is applied to the sealing tape 10, The deformed shape can be held as an original shape.

According to the sealing tape, since it can be adhered in an unvulcanized state, it can be freely deformed, and even if it is bent to a desired shape, the portion may be sagged or peeled off. Since there is no sealing tape, the sealing tape can be adhered along the shape of the joint, and the finished state can be improved. Also, the bottom surface of the sealing tape is deformed against the target shape by pressing at the time of sticking, so even if the joint has a step, it can be adhered to some extent without providing a step on the bottom surface. Becomes

Further, after the sealing tape 10 is adhered, a coating process is performed from above, so that the sealing tape can be vulcanized by a heat treatment during the coating process. The bent shape becomes the original shape, and this shape can be held with resilience. Therefore, the vulcanization of the sealing tape can be achieved in a normal coating step without providing a special step for vulcanizing.

[0035]

Next, an embodiment of the method for producing a sealing tape of the present invention will be described. In a hopper 101, a rubber base material was mixed with sulfur oxide as a vulcanization accelerator, polybutene as an antioxidant, titanium oxide as a pigment, and calcium carbonate as an extender in the composition shown in the table below, and a sealing tape. 10 materials. The temperature of the sealing tape material in the hopper 101 was 50 ° C.

[0036]

[Table 1] Rubber base material 40 parts Sulfur oxide (vulcanization accelerator) 10 parts Polybutene (antioxidant) 12 parts Titanium oxide (pigment) 10 parts Calcium carbonate (extending agent) 28 parts

Next, the above-described material is processed to form a rectangular sheet 201 having a length in the longitudinal direction of about 12 m. Immediately as the next step, an adhesive sheet 301 having an adhesive applied to the back surface of the rectangular sheet 201 is formed. Affix. Then, a plurality of blades 4
A plurality of sealing tapes 10 were simultaneously obtained by cutting the rectangular sheet 201 while moving it by the roll-shaped cutter 401 having the circular recesses 403 formed therein. At the time of cutting, the temperature of the rectangular sheet 201 was set to 40 ° C.

In the case where the sealing tape 10 according to the above embodiment is used to adhere to a joining step between metals, the shape is freely deformed and bent into a desired shape along the adhered portion. Also, there was no sagging or peeling at the bent portion. Further, when the coating treatment was performed thereafter, it was confirmed that the sealing tape was vulcanized by the heat treatment during the coating treatment and retained the deformed shape.

[0039]

According to the method of the present invention, since the rectangular sheet is cut while being shaped by pressing the roll-shaped cutter while moving the rectangular sheet, it is possible to obtain a long sealing tape in an unvulcanized state. it can. And if the concave part of a roll-shaped cutter is made into an arc shape, the upper surface of a sealing tape can be made into a curved part and it can be set as the shape suitable for a tape.

[Brief description of the drawings]

FIG. 1 is a process explanatory view for explaining a method for producing a sealing tape of the present invention.

FIG. 2 is a perspective explanatory view showing a state in which a rectangular sheet is cut by a roll-shaped cutter in a cutting step according to the manufacturing method of the present invention.

FIG. 3 is an explanatory front view of a roll cutter used in the production method of the present invention.

FIG. 4 is an explanatory cross-sectional view of a sealing tape for explaining shaping when cutting a rectangular sheet.

FIG. 5 is a perspective explanatory view showing a part of the sealing tape manufactured by the method of the present invention.

FIG. 6 is an explanatory perspective view showing a state in which a sealing tape is attached to a joining step portion of a metal plate in a door.

FIG. 7 is an explanatory sectional view showing a state in which a sealing tape is attached to a joining step portion of a metal plate.

FIG. 8 is an explanatory perspective view of a sealing tape.

FIG. 9 is an explanatory cross-sectional view showing a state in which a sealant is applied to a joining step portion of a metal plate.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Bottom surface 2 Curved surface 3 Adhesive sheet 4 Protective tape 10 Sealing tape 100 Material production process 200 Processing process 201 Square sheet 300 Adhesive sticking process 301 Adhesive sheet 400 Cutting process 401 Roll-shaped cutter 402 Blade 403 Arc-shaped concave portion A first metal plate B second metal plate C bent portion D joining step portion G corner portion

Claims (5)

[Claims] 1. A material producing step for producing a sealing tape material containing a rubber base material and a vulcanization accelerator, a processing step of processing the sealing tape material into a square sheet in an unvulcanized state, An adhesive bonding step of bonding an adhesive sheet having an adhesive applied to the bottom surface of the rectangular sheet, and moving the rectangular sheet on its upper surface side at least two along a cylindrical circumference. The above-mentioned blade and a roll-shaped cutter having a concave portion formed between the blades are pressed, and the rectangular sheet is cut into a tape shape while being shaped into a long shape having a thickness with respect to the bottom surface, and sealing is performed. A method for producing a sealing tape, comprising: a cutting step of obtaining a tape. 2. The method of manufacturing a sealing tape according to claim 1, wherein the concave portion of the roll-shaped cutter is formed in an arc shape so that the upper surface of the sealing tape becomes a curved portion. 3. The method for producing a sealing tape according to claim 1, wherein an antioxidant is added in the material producing step. 4. A cutting method for cutting a rectangular sheet formed of a deformable material, wherein at least two or more sheets are formed along a cylindrical circumference on an upper surface side of the rectangular sheet while moving the rectangular sheet. Pressing the roll-shaped cutter in which a concave portion is formed between the blades and these blades, and cutting the rectangular sheet into a tape while trimming it into a long shape having a thickness with respect to the bottom surface. Characteristic square sheet cutting method. 5. A roll-shaped cutter in which a blade is formed on a surface of a cylindrical body, wherein a plurality of the blades are formed along a circumference, and a continuous arc is formed between the blades with the blade being the top. A roll-shaped cutting device, wherein a concave portion is formed.