JPS6351070B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a cleaning method and a cleaning device suitable for cleaning the surface of a resin product molded from a synthetic resin material using a chlorinated organic solvent. It is related to.

[Conventional technology]

Conventionally, when cleaning the surface of a resin product formed from a synthetic resin material such as a urethane bumper for an automobile, an alkaline cleaning method has been used in which an alkaline degreasing liquid is sprayed onto the surface of the resin product to degrease and clean it. A steam cleaning method that uses a chlorinated organic solvent such as trichlorethylene to condense evaporated mist on the surface of a resin product to degrease and clean it is widely used.

However, in the former alkaline cleaning method,
After degreasing and cleaning resin products, equipment for rinsing, drying, etc. is required, which not only increases the equipment cost, but also complicates composition management of the alkaline degreasing solution. On the other hand, the latter evaporative cleaning method is more advantageous than the former alkaline cleaning method in terms of equipment cost and composition control, but because it cleans by the dissolving power of condensation caused by the evaporative mist of a chlorinated organic solvent, dust It has the disadvantage that it cannot completely remove solids such as.

As a solution to the above problem, the inventor has proposed a cleaning device that sprays a chlorinated organic solvent as shown in FIG.

In FIG. 2, reference numeral 51 denotes a cleaning tank formed in the shape of a box with an open top, and a cooling pipe 52 that uses water, cold air, etc. as a cooling medium is installed around the inside and upper part of the cleaning tank 51. A cooling area A is formed, and below this cooling area A, a plurality of riser pipes 53 each having a large number of air outlets (not shown) are provided at intervals. Area B
is formed. Further, a storage tank 54 containing a chlorinated organic solvent H such as trichlorethylene is provided at the bottom of the cleaning tank 51, and a cleaning liquid area C
is formed. This storage tank 54 and riser pipe 5
A supply pipe 55 is provided between the storage tank 54 and a filter 56, a pump 57, and a heat exchanger 58 in order from the storage tank 54 side. By operating the pump 57, the water is heated to boiling temperature as it passes through the heat exchanger 58. Further, a conveyor 59 is disposed in the longitudinal direction of the cleaning tank 51, from which a plurality of article supports 60 are suspended, and resin products W are supported at the tips thereof.

When cleaning the resin product W, a cooling medium is passed through the cooling pipe 52 and the cleaning tank 5
A cooling area A is formed above the cleaning tank 51 , and the conveyor 59 is operated to carry the resin product W into the cleaning area B in the cleaning tank 51 . At the same time, the pump 57 is operated to cause the chlorinated organic solvent H contained in the storage tank 54 to pass through the supply pipe 55 and to be supplied to the plurality of riser pipes 53 in the cleaning tank 51. that time,
Solids such as dust are removed from the chlorinated organic solvent W when it passes through a filter 56 provided in the middle of the supply pipe 55, and when it passes through a heat exchanger 58 provided downstream thereof. The water is heated to boiling temperature and supplied to the plurality of riser pipes 53.

Further, the chlorinated organic solvent supplied to the plurality of riser pipes 53 is sprayed toward the resin product from the outlet. At this time, wax components such as a mold release agent adhering to the surface of the resin product W are removed by the dissolving power of the chlorinated organic solvent, and solid components such as dust are removed from the plurality of riser pipes 53. It is designed to be removed by the impact force of the sprayed chlorinated organic solvent W.

[Problem that the invention seeks to solve]

However, in such a resin product cleaning device, when cleaning the resin product W, the resin product W is cleaned using the impact force generated by spraying the chlorinated organic solvent heated to boiling temperature and the dissolving power of the chlorinated organic solvent. Therefore, wax content such as mold release agents and solid content such as dust that adhere to the surface of resin products W during molding can be effectively removed, but solid content contained in chlorinated organic solvents can be removed by filters. 56
Since the fine dust cannot be removed sufficiently, there is a problem that the fine dust adheres to the surface of the resin product W when the chlorinated organic solvent is sprayed.

Therefore, the technical problem of the present invention is to store a distilled chlorinated organic solvent and spray the distilled solvent onto the surface of the resin product when cleaning a resin product made from a synthetic resin material. Therefore, when spraying a chlorinated organic solvent, it is possible to completely remove dust and the like without adhering fine dust to the surface of the resin product.

[Means for solving problems]

That is, in the method for cleaning resin products according to the present invention, deposits such as mold release agents and dust adhering to the surface of resin products formed from synthetic resin materials such as urethane and polypropylene are removed using chlorine such as trichlorethylene. When cleaning and removing using a chlorinated organic solvent, there is a spray cleaning method in which the evaporated mist of the organic solvent is cooled, a distilled solvent is stored, the distilled solvent is heated and adjusted to below boiling temperature, and then sprayed, and a chlorinated organic solvent is sprayed. The surface of the resin product is cleaned in combination with steam cleaning in which the evaporated mist of the solvent is condensed.

In addition, in the resin product cleaning apparatus according to the present invention, a gutter-shaped groove is provided around the inside and upper part of the cleaning tank, and above this groove, water, cold air, etc. are used as a cooling medium. Cooling pipes are provided around the periphery to form a cooling area. Further, a riser pipe in which a large number of blow-off ports are formed is provided below this cooling area, and forms a cleaning area.
Further, a chlorinated organic solvent such as trichlorethylene is contained at the bottom of the cleaning tank, forming a cleaning liquid area. A heater is installed in the chlorinated organic solvent in the cleaning tank to heat it using steam, etc., and a groove surrounding the upper part of the cleaning tank and a riser pipe inside the cleaning tank are installed. are connected by a supply pipe, and a heat exchanger and a pump for heating and adjusting the distilling agent to below the boiling temperature are sequentially provided in the middle of the supply pipe.

[Effect]

In such a cleaning device for resin products, when cleaning resin products, a cooling medium such as water or cold air is passed through the cooling pipe to form a cooling area above the cleaning tank, and a heater in the cleaning tank is is activated to heat and evaporate the chlorinated organic solvent, forming a cleaning area with evaporative mist below the cooling area.
At this time, some of the evaporated mist condenses on the cooling pipe and falls into the grooves of the cleaning tank and is collected as distilled solvent. In this state, the resin product is carried into the cleaning area.

At the same time, the pump is operated to cause the distilled solvent stored in the groove of the cleaning tank to pass through the supply pipe and to be supplied to the riser pipe in the cleaning tank. At this time, the distilled solvent is heated and adjusted to below boiling temperature when passing through a heat exchanger provided in the middle of the supply pipe, and then supplied to the riser pipe.

Then, the distilled solvent supplied to the riser pipe is sprayed from multiple outlets toward the resin product, and the evaporated mist of the chlorinated organic solvent heated and evaporated by the heater is applied to the surface of the resin product. Condensation occurs. At this time, wax content such as mold release agent adhering to the surface of the resin product is removed by the dissolving power of the sprayed distilled solvent and condensed chlorinated organic solvent, and solid content such as dust is removed by the sizer. It is physically removed by the impact force (pressure) of the distilled solvent sprayed from the tube.

As a result, the chlorinated organic solvent is distilled and sprayed onto the surface of the resin product in a high-speed stream in the form of a purified distilled solvent that does not contain fine dust. There will be no adhesion such as.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for cleaning resin products and a cleaning apparatus therefor according to the present invention will be explained in detail below based on embodiments shown in the drawings.

FIG. 1 shows a schematic sectional view of a cleaning apparatus for resin products according to the present invention.

In FIG. 1, reference numeral 1 denotes a cleaning tank formed of a metal material in a box shape, and only the upper part of the cleaning tank 1 is open, and the upper part expands outwards to form a bulging part 1a. A gutter-like groove 2 is provided around the bottom of the bulge 1a, and the bottom 1b is a flat surface.
A cooling pipe 3 using water, cold air, or the like as a cooling medium is disposed above the groove 2, and forms a cooling area A above the inside of the cleaning tank 1.

Further, a riser pipe 4 in which a large number of air outlets 4a are formed is disposed below the cooling area A, which is approximately the center of the cleaning tank 1, and a cleaning area B is located approximately at the center of the cleaning tank 1. is formed. Furthermore, cleaning tank 1
A cleaning liquid H made of a chlorinated organic solvent such as trichlorethylene is stored in the bottom 1b of the cleaning tank 1, and a cleaning liquid area C is formed by the bottom 1b of the cleaning tank 1. A pipe 5 supported by a cleaning tank 1 is disposed in the cleaning liquid H, and a valve 6 is provided in the middle of the pipe 5 to control the amount of heating medium such as hot air or steam supplied into the pipe 5. I'm starting to do that.

In addition, near the cleaning tank 1, there is distilled cleaning liquid.
A supply pipe 7 for passing Ha is arranged, one end of which is connected to a groove 2 circumferentially provided above the cleaning tank 1, and the other end arranged inside the cleaning tank 1. It is connected to the riser pipe 4. A valve 8a is provided on the outlet side of the supply pipe 7, and the distilled cleaning liquid Ha passing through the supply pipe 7 and the distilled cleaning liquid (distilled solvent) blown out from the outlet 4a of the riser pipe 4 The amount of Ha can be adjusted.

Further, in the middle of the supply pipe 7, there is a heat exchanger 9 that heats and adjusts the distilled cleaning liquid (distilled solvent) Ha from the groove 2 of the cleaning tank 1 to below the boiling temperature, and a heat exchanger 9 that heats and adjusts the distilled cleaning liquid Ha from the groove 2 of the cleaning tank 1 to below the boiling temperature. Pumps 10 are sequentially provided to allow the air to pass from the groove 2 to the supply pipe 7 to supply the riser pipe 4, and among these, the heat exchanger 9 is provided with an air supply pipe 11 that uses hot air, steam, etc. as a heating medium. A valve 8b is provided in the middle thereof to adjust the amount of air supplied to the heating medium.

Further, a conveyor 12 is installed in the longitudinal direction above the cleaning tank 1, and is sloped sequentially downward from the loading side of the cleaning tank 1, is formed horizontally above the cleaning tank 1, and is horizontal on the loading side of the cleaning tank 1. They are arranged so as to be slanted upward in sequence. A support 13 is suspended from the conveyor 12 to support the resin product W made of a synthetic resin material and carry it into the cleaning area B in the cleaning tank 1. A plurality of them are provided. This results in
The resin product W is transferred into and out of the cleaning tank 1 by the conveyor 12 moving in the direction of arrow D.

A method for cleaning resin products W in the resin product cleaning apparatus configured as described above will be described.

First, a heating medium such as hot air or steam is supplied from the air supply pipe 11 to the heat exchanger 9, and a cooling medium such as water or cold air is passed through the cooling pipe 3 to form a cooling area A above the cleaning tank 1. .

At the same time, a heating medium such as steam or hot air is supplied to the pipe 5 to heat and evaporate the cleaning liquid H made of a chlorinated organic solvent in the cleaning tank 1 to form a cleaning area B made of evaporated mist. A part of the water is condensed in the cooling pipe 3 and the water is removed from the cleaning tank 1.
It falls into groove 2 and is collected as a distillation solvent. At the same time as the heating medium is supplied to the pipe 5, the pump 10 of the supply pipe 7 is operated, and the distilled cleaning liquid (distilled solvent) Ha stored in the groove 2 of the cleaning tank 1 is passed through the supply pipe 7. At the same time, the conveyor 12 is operated in the direction of arrow D to transport the resin product W supported by the support 13 to the cleaning area B in the cleaning tank 1. At that time, when the distilled cleaning liquid Ha passes through the heat exchanger 9 provided in the middle of the supply pipe 7, the distilled cleaning liquid Ha is heated and adjusted to below boiling temperature by the heating medium. It is supplied to the riser pipe 4 in the cleaning tank 1.

The cleaning liquid (distilled solvent) Ha supplied to the riser pipe 4 is sprayed from the outlet 4a toward the resin product W, and the evaporated mist of the cleaning liquid H heated and evaporated by the heating medium adheres to the surface. Wax components such as mold release agents are removed by the dissolving power of distilled cleaning solution (distilled solvent) Ha and dew condensed cleaning solution H, and solid components such as dust are removed by distillation sprayed from the riser pipe 4. The cleaning solution (distilled solvent) Ha is physically swept away and removed by the impact force (pressure) of the high-speed flow.

Further, the cleaning liquid (distilled solvent) Ha sprayed toward the resin product W falls to the bottom 1b of the cleaning tank 1 and is collected, and the cleaning liquid H consisting of evaporated mist is formed above the cleaning tank 1. It is cooled in the cooling area A and collected at the bottom 1b of the cleaning tank 1. Furthermore, some of the evaporated mist condenses on the cooling pipe 3 and is collected and stored in the groove 2 of the cleaning tank 1 as distilled solvent Ha. The cleaning liquid H collected in the bottom 1b of the cleaning tank 1 is heated and evaporated again by the heating medium to form a cleaning area B consisting of evaporated mist, and the cleaning liquid H collected in the groove 2 of the cleaning tank 1 ( Distilled solvent) Ha is again heat exchanger 9
The riser tube 4 is heated and adjusted to below the boiling temperature.
and is sprayed toward the resin product W supported by the support 13 in the same manner as described above.

The resin product W, which has been washed for a predetermined period of time, is then pulled up from the washing tank 1 while being supported by the support 13 and being transferred in the direction of arrow D within the washing tank 1. At this time, since the resin product W is also heated by the evaporative mist cleaning liquid H heated to boiling temperature, the cleaning liquid H is completely evaporated before being pulled up outside the cleaning tank 1. Then, the resin product W from which the cleaning liquid H has been evaporated is transferred to the next process by the conveyor 12.

〔Effect of the invention〕

As explained above, in the resin product cleaning method and its cleaning device according to the present invention, when cleaning resin products formed from synthetic resin materials, the distilled solvent is heated and adjusted to below the boiling temperature. Since the surface of the resin product is cleaned using a combination of spray cleaning that sprays at high speed and steam cleaning that cleans the chlorinated organic solvent made of evaporated mist by condensation, it is possible to clean the surface of the resin product when spraying the distilled solvent. It has the effect of completely removing wax content such as a mold release agent and solid content such as dust, without causing fine dust to adhere to the surface of the resin product.

Further, in the cleaning device according to the present invention, since the distilled solvent is collected and stored when cleaning resin products, there is no need to separately prepare the distilled solvent, and the cleaning work can be carried out efficiently.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of a cleaning apparatus for resin products according to the present invention. FIG. 2 is a schematic cross-sectional view of a conventional cleaning device for resin products. 1...Cleaning tank, 1a...Bulging part, 1b...Bottom, 2...Groove, 3...Cooling pipe, 4...
riser pipe, 4a...outlet, 5...pipe,
6... Valve, 7... Supply pipe, 8a, 8b... Valve, 9... Heat exchanger, 10... Pump, 11...
...Air supply pipe, 12...Conveyor, 13...Support,
A...Cooling area, B...Cleaning area, C...Cleaning liquid area,
H...Washing liquid, Ha...Distilled washing liquid.

Claims (1)

[Claims] 1. When cleaning the surface of a resin product formed from a synthetic resin material with a chlorinated organic solvent such as trichlorethylene, the evaporated mist of the organic solvent is cooled and the distilled solvent is stored; The surface of the resin product is cleaned using a combination of spray cleaning in which the distilled solvent is heated and adjusted to below boiling temperature and then sprayed, and steam cleaning by condensation of evaporated mist of the chlorinated organic solvent. How to clean resin products. 2. A gutter-shaped groove is installed above the inside of the cleaning tank, a cooling pipe is installed around the top of this groove to form a cooling area, and a riser pipe is installed below this cooling area for cleaning. A chlorinated organic solvent such as trichlorethylene is contained in the bottom of the cleaning tank to form a cleaning liquid area, and a heater is provided in the cleaning liquid area, and further,
Connect the groove of the cleaning tank and the riser pipe with a supply pipe,
A cleaning device for resin products, characterized in that a heat exchanger and a pump for heating and adjusting the distilled solvent to below boiling temperature are provided in the middle of a supply pipe.