JP2002068040A - Method of removing coating film of bumper for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently remove the coating film of a bumper with excellent working efficiency, without generating a problem caused by use of an organic solvent. SOLUTION: The coating film of the bumper W is separated to be removed by blasting a blast material onto the surface of the automobile bumper W.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD OF THE INVENTION

[0001] The present invention relates to a method for removing a film from an automobile bumper, and more particularly, to a method for removing various films including a paint film.
It removes and removes efficiently without being happy about environmental pollution.

[Prior art]

Regardless of whether a synthetic resin bumper as an automobile part is used as a recycled material from the viewpoint of resource reuse and reused as a bumper, or as a raw material for other products, Conventionally, bumpers themselves are immersed in an organic solvent because it is important to completely remove the plating film, thermal spray film, coating film, etc. in order to impart the required physical properties to the recycled product. It has been proposed to dissolve and remove the coating, whereby it is possible to completely remove the coating without damaging the base of the bumper.

[0003]

However, this proposed technique has a problem that the working efficiency is low, and the use of an organic solvent deteriorates the working environment and causes environmental pollution. There was a problem that would be received.

[0004] The present invention has been made as a result of studying to solve such problems in the prior art, and an object thereof is to solve such problems caused by the use of an organic solvent. An object of the present invention is to provide a method of removing a bumper film for an automobile, which can efficiently remove the film of the bumper without causing a problem and with excellent work efficiency.

[0005]

According to the present invention, there is provided a method of removing a film from a bumper for an automobile, wherein the blast material is sprayed on the surface of the bumper for an automobile to peel off and remove the film from the bumper.

In this method, the blast material is evenly sprayed on each part of the bumper surface by a blast method using compressed air, a centrifugal blast method, or the like, so that the film of the bumper can be dried without using an organic solvent. Under the conditions, it can be efficiently removed in a short period of time and removed, and the blast material that has contributed to the peeling of the film is recovered together with the release film, and then separated from the release film using a cyclone or the like. Can be re-used. Here, by separately collecting only the release film separated from the blast material, it is possible to sufficiently prevent environmental pollution and the like caused by scattering of the release film.

Thus, according to the present invention, it is possible to sufficiently prevent the problem caused by the use of the organic solvent, and to completely remove the coating over the entire bumper with high efficiency. Can be done.

By the way, the blast material is composed of one or more thermosetting resin materials, for example, melamine resin,
Urea resin, phenolic resin, unsaturated polyester, it can be a granular material such as polycarbonate, according to this, a film such as a urethane coating film of the bumper, can be peeled without damaging the bumper itself, Therefore, by repainting the bumper, it can be immediately provided to the crown. On the other hand, a sand, grid, steel ball shot, or the like can be used as the blast material.

Here, the particle size of the blast material is about 10 μm to 2 mm when it is made of a thermosetting resin material, and when it is made of a steel grid,
The thickness is preferably about 100 μm to 2 mm, and in the case of a steel ball shot, it is preferably about 30 μm to 2 mm in order to sufficiently secure the peeling performance of the film without damaging the base material of the bumper.

When the bumper is made of a synthetic resin and has relatively high elasticity, the surface rigidity is increased by applying a tensile force to the bumper and / or the bumper is, for example, about 0 to 15 ° C. It is preferable to increase the hardness by cooling to room temperature. According to this, the collision energy of the sprayed blast material with respect to the bumper is advantageously prevented from being absorbed by the elastic deformation of the bumper, and the collision energy can be effectively contributed for the peeling of the film. it can.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a conceptual view showing a part of a device suitable for use in the embodiment of the present invention as a cross section in a case where a coating of an automobile bumper is removed by a blast method using compressed air.
Is a blast chamber that defines a closed space and prevents scattering of dust such as blast material and release film. 2 is a negative pressure atmosphere in the blast chamber for collecting and separating those blast materials and the like. Blowers are shown as examples of the pressure reducing means, and 3 is a porous bottom wall of the blast chamber 1 and a blower 2.
And a suction passage connecting the two.

Here, a linear running shaft 5 which can be constituted by, for example, a guide rail and a rodless cylinder is attached to the upper inside of the blast chamber 1, in the figure, to the ceiling wall 4. The manipulator 6 is suspended. The manipulator 6 has a base 7 that can move along the straight traveling axis 5 and, for example, three or more rotation axes, and has, on its wrist, an injection nozzle 8 that injects blast material together with compressed air. Let it.

In addition, a swing arm 10 swinging in a horizontal plane is provided at a lower portion of the inner side of the blast chamber 1 at a certain interval from the bottom wall 9 of the perforated plate. In addition, a turntable 11 having a dimension capable of sufficiently stably supporting the automobile bumper as the work W is provided, and the swing motion of the swing arm 10 and the rotation motion of the turntable 11 are also performed. The driving means 12 is disposed outside the blast chamber 1.

By the way, in order to operate the swing arm 10 and the like in the blast chamber by the driving means 12 outside the blast chamber, at least the swing arm 10 must be penetrated into and out of the blast chamber 1 and the blast chamber 1 Since it is necessary to provide a horizontal opening in the outer wall that allows the swinging of the swinging arm, the opening is made of a flexible or elastic material that allows the displacement of the swinging arm 10 but prevents leakage of dust and the like. It is preferable to close with a member.

Here, when the work W is rich in elasticity such as an automobile bumper made of synthetic resin, for example, the internal temperature of the blast chamber 1 is maintained at about 0 to 15 ° C. to increase the hardness of the work W. The bumper is provided with, for example, an extension device such as a jack or a spring means disposed in a back recess (not shown) of the bumper, and imparts a tensile force to the bumper in its longitudinal direction, for example, to increase its surface rigidity. It is preferable to reduce the amount of elastic deformation of the work W by increasing the impact in order to effectively use the impact of the blast material against the work W for peeling off the film.

In this case, the blast material separation and recovery means 13 and the blast material separation means 13 are sequentially placed in the suction passage 3 from the blast chamber side.
A garbage separation / recovery means 14 is provided so that the clean air separated therefrom can be discharged from the blower 2 to the atmosphere.

Here, the blast material separation / recovery means 13 includes, for example, a separation unit 13a and a storage unit 13b for temporarily storing the blast material separated by the separation unit 13a.
And a supply unit 13c for mixing the blast material received from the storage unit 13b into the compressed air flow under pressure,
The blast material mixed in the compressed air is again injected into the injection nozzle 8.
Is injected toward the workpiece W through The various opening / closing valves of the separation / collection means 13 can be opened / closed as required based on, for example, sequence control.

The illustrated separating portion 13a divides the inside of the housing into an inlet side and an outlet side except for a lower end portion, arranges a sieve member on the inlet side, and provides a plurality of obstructions on the outlet side. It is configured by alternately arranging the plates, and the blast material that has fallen to the lower end is allowed to flow down to the storage unit 13b,
The separating section 13a may be constituted by a cyclone or other known separating means. In addition, although not shown, the exclusion of what is supplemented on the sieve member is to provide a suction means or the like that separately sucks what has accumulated there, to periodically clean the sieve member, and to periodically clean the sieve member. It can be dealt with by replacing it with a new one.

The garbage separating and collecting means 14 includes a filter section 14a, a storage section 14b for temporarily storing foreign matter separated therefrom, and a collecting section 14c for taking in the foreign matter in the storage section 14b at a required timing. The foreign matter in the collection unit 14c is taken out from the collection unit 14c as necessary and discarded.

The injection of the blast material onto the workpiece W in the apparatus having the above-described configuration is performed by the operator based on the selection and setting of a program according to the type, dimensions, and the like of the workpiece W. 6. As a result, the injection nozzle 8 attached thereto is moved with respect to the work W as required, and preferably, the work itself, whose hardness or surface rigidity has been increased in advance as described above, is moved to the swing arm 10. The blast material, for example, a blast material made of one or two or more kinds of thermosetting resin material particles is sprayed together with the compressed air from the spray nozzle 8 while moving the turntable 11 as required. According to this, peeling of the film on the work surface can be performed in a short time regardless of the size of the work. Completely can be performed in one of the, moreover, can be closed if any unnecessary the use of organic solvents.

Here, the work W on the turntable
When it is necessary to invert the top and bottom of the workpiece W, for example, after the reversal by the operator's hand, the same ejection of the blast material is repeated, so that the entire work W can be uniformly peeled. .

On the other hand, foreign substances including the blast material after work and the peeled film are reduced from the bottom wall 9 of the perforated plate by the decompression of the blast chamber 1 based on the action of the blower 2 so that the suction passage 3 is removed. After passing through the circuit nozzle 15, it is first guided to the blast material separation / recovery means 13 to separate the blast material, and then guided to the garbage separation / recovery means 14 to separate foreign matter. Then, the blast collected by the supply unit 13c is jetted again from the jet nozzle 8 to be used for peeling off the film, and the foreign matter collected by the collection unit 14c is discarded.

FIG. 2 is a conceptual diagram showing an apparatus suitable for use in the embodiment of the present invention in the case of removing the coating of an automobile bumper by a centrifugal blast method. this is,
A belt conveyor 22 is provided so as to penetrate the blast chamber 21. By this belt conveyor 22, an automobile bumper as a work W placed thereon can be carried into the blast chamber at a required speed, and can be carried out therefrom. At the same time, a centrifugal blast device 24 driven by a motor 23 is disposed on the top wall of the blast chamber 21, and a hopper 25 for supplying blast material to the centrifugal blast device 24.
Is provided.

Here, the centrifugal blast device 24, as shown in FIG. 3, for example, has a distributor 26 provided on its peripheral surface with a plurality of holes at predetermined intervals in the circumferential direction, and accommodates the distributor 26. A control cage 27 having an opening in a peripheral surface, and an impeller 28 that accommodates the control cage 27 in a boss portion, has an opening in the boss portion between the respective blades, and is rotationally driven by a motor 23. In this device 24, the hopper 25 feeds the introduction cylinder 2
The blast material 30 supplied to the inside of the distributor 26 through the opening 9 is connected to the opening 27 of the control cage 27.
a, and is accelerated by the blade 28c through the opening 28b of the boss 28a of the impeller 28 and projected onto the surface of the work W.

Therefore, under such a projection of the blast material 30 by the centrifugal blast device 24, the work W is caused to enter the blast chamber 21 as shown in FIG. , The film on the upper surface of the work W can be quickly and reliably peeled and removed as in the previous case. In this case, also, by applying a tensile force to the work W by appropriate means, the peeling and removal of the film can be performed.
It can be done more quickly and reliably.

On the other hand, the blast material 30 that has contributed to the peeling of the film of the work W and the peeled film and the like are separated, for example, by the respective separation and collection means 13 as described above.
The blast material 30 separated and collected at 14 is collected and reused through the supply hopper 25. In addition, foreign substances such as a release film and a crushed blast material are discarded after being collected.

FIG. 4 is a conceptual view showing still another apparatus. This apparatus is provided with a motor 32 for rotating a suspended and supported work W at a required speed at the top of a blast chamber 31. Centrifugal blasting devices 33 and 34 having the same configuration as described above for projecting the blasting material on the surface of
The blast chamber 31 is installed in two upper and lower stages on the side. In this apparatus, by simultaneously operating both blasting devices 33 and 34, the film over the entire length of the work W can be simultaneously peeled and removed, and the work W can be rotated at a required speed to rotate the work W. Can be peeled off and removed on the entire peripheral surface.

Therefore, here, when the length of the work W is short, only one centrifugal blasting device can be installed, and when it is long, three or more units are installed vertically. Can also. By the way, the impeller of the centrifugal blasting device is made of eight blades, and the blade width is 50-1.
00mm, impeller rotation speed 3800-5000r
pm, and when the distance between the blade tip and the work surface is 500 mm, the projection width of the blast material is 50 to 100 mm according to the blade width, and the projection length is about 500 mm. Can be.

Incidentally, also in this apparatus, the work W is cooled to about 0 to 15 ° C.
It is preferable to apply a predetermined tensile force to the film in order to more quickly remove the film completely. Separation and recovery of the coating and the blast material thus separated and removed can be performed in the same manner as described above.

Although the above embodiments of the present invention have been described in relation to an apparatus suitable for use in the present invention, the present invention relates to a suction type blast apparatus, a gravity type blast apparatus other than the illustrated pressure type blast apparatus. And the like, and the entire configuration of the apparatus can be appropriately changed as necessary, including manual operation of the injection nozzle.

[0031]

As described above, according to the present invention, it is possible to extremely efficiently remove and remove the coating of an automobile bumper without using an organic solvent. When a granular material of a curable resin material is used, even if the bumper is made of a synthetic resin, it is possible to sufficiently prevent the occurrence of scratches on the surface of the main body of the bumper.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing an embodiment of the present invention.

FIG. 2 is a conceptual diagram showing another embodiment of the present invention.

FIG. 3 is an exploded perspective view illustrating a centrifugal blast device.

FIG. 4 is a conceptual diagram showing still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 21, 31 Blast chamber 2 Blower 3 Suction passage 4 Ceiling wall 5 Linear running shaft 6 Articulated manipulator 7 Base 8 Injection nozzle 9 Perforated plate bottom wall 10 Swing arm 11 Turntable 12 Drive means 13 Blast material separation and collection means 14 Waste separation / recovery means 22 Belt conveyor 23 Motor 24, 33, 34 Centrifugal blast device 25 Supply hopper 26 Distributor 27 Control cage 27a, 28b Opening 28 Impeller 28a Boss 28c Blade 32 Motor W Work

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) B60S 5/00 B60S 5/00

Claims (5)

[Claims] 1. A method for removing a film from a bumper for an automobile, wherein a film of the bumper is peeled off by spraying a blast material onto the surface of the bumper for an automobile. 2. The method for removing a film from an automobile bumper according to claim 1, wherein the automobile bumper is made of a synthetic resin. 3. The method for removing a film from an automobile bumper according to claim 1, wherein a granular material of one or more thermosetting resin materials is used as a blast material. 4. The method for removing a film from an automobile bumper according to claim 2, wherein a surface tension is increased by applying a tensile force to the automobile bumper. 5. The method for removing a film from an automobile bumper according to claim 2, wherein the automobile bumper is cooled to increase hardness.