JP2015085318A - Cleaning medium, dry cleaning device, and dry cleaning method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cleaning medium which is capable of selectively removing only contamination attached to a surface layer without damaging a parent material of a cleaning object, and has a large cleaning effect to film-state and hard contamination as well.SOLUTION: An opening part 10E of a dry cleaning housing 10 contacts a cleaning object CO and is clogged, external air enters at high speed from an inlet 10F to form revolving air flow RF, cleaning media PC collide the cleaning object CO while making circulation flight due to the revolving air flow RF and remove contamination, by which a cleaning action is performed. Crushed pieces of shellfish shells are used as the cleaning media PC. The shellfish shells have a lamination structure in which crystals of an inorganic substance are bound by an organic substance. A cleaning function is obtained by the inorganic substance on a surface layer, the layer is appropriately peeled off to allow a new inorganic substance to be exposed, and thus cleaning performance is maintained at a constant level.

Description

  The present invention relates to a cleaning medium that is repeatedly applied to an object to be cleaned, a dry cleaning apparatus using the cleaning medium, and a dry cleaning method.

In recent years, from the viewpoint of reducing the environmental load, a dry cleaning apparatus has been proposed that removes dirt adhered to an object to be cleaned using a solid cleaning medium without using water or a solvent.
Patent Document 1 discloses a handy-type dry cleaning device that can arbitrarily change a cleaning position for an object to be cleaned.
This cleaning device has an internal space in which the cleaning medium circulates and flies and an opening for causing the cleaning medium flying in the internal space to collide with the object to be cleaned.
Furthermore, a ventilation path for passing air from the outside to the internal space, an intake port connected to a suction means such as a vacuum cleaner, and a perforated metal such as punching metal that allows a removal object removed from the cleaning object to pass to the intake port side. Means.
The internal space, the opening, the air passage, the air inlet, and the porous means are integrally formed in a dry cleaning housing connected to the suction means and the flexible hose.

The cleaning position can be easily changed by holding and moving the dry cleaning housing by hand.
When the suction means is operated, a large amount of external air flows into the internal space mainly from the opening, and the internal space is in a negative pressure state.
When a predetermined amount of the cleaning medium is sucked from the opening in the negative pressure state, the cleaning medium sticks to the porous means and is held in the dry cleaning casing.
In this state, when the opening is covered with the part to be cleaned of the object to be cleaned, external air flows at a high speed from the air passage having a smaller cross-sectional area than the opening, and a swirling airflow is generated in the internal space, which is stretched on the porous means. The attached cleaning medium flies.
The cleaning medium that continues to circulate in the interior space rides on the airflow flowing at high speed from the ventilation path and flies linearly toward the opening at high speed, and collides with the object to be cleaned exposed at the opening to remove dirt. To do. This collision operation is repeated by the airflow a thousand times.

As the cleaning medium, resin pieces such as polycarbonate, polyethylene terephthalate, acrylic, cellulose, melamine, and urea are used.
In particular, thermosetting resin pieces such as melamine resin and urea resin are mainly used.

In this type of dry cleaning, if a hard cleaning medium is used, it is easy to remove dirt, but the base material of the object to be cleaned is damaged, and it is difficult to obtain a high-quality cleaning surface.
For example, a metal piece can be used, but if the object to be cleaned has a lower hardness than the metal, damage to the cleaning surface cannot be avoided.
On the other hand, a cleaning medium with low hardness is worn early by repeatedly colliding with an object to be cleaned, and the function of biting into a dirty surface is lowered, so that a certain cleaning ability cannot be obtained. In order to solve this, it is necessary to frequently replace the cleaning medium with a new one.
In the case of a cleaning medium that wears out early, the cleaning effect is particularly low on film-like dirt having a strong adhesion to the surface of the object to be cleaned.
In the cleaning medium using the resin piece, a phenomenon that a part of the cleaning medium breaks and a new edge appears during the cleaning operation, and a certain cleaning ability may be maintained to some extent without being replaced. Could not cope with dirt.

For this reason, it is possible to selectively remove only the dirt adhering to the surface layer without damaging the base material of the object to be cleaned, and a cleaning medium having a high cleaning effect against film-like dirt and hard dirt. Needs are growing.
In addition, since the cleaning medium is a consumable item, it is desirable that the cleaning medium is inexpensive and easily available from the viewpoint of reducing the running cost of the cleaning operation.

  The main object of the present invention is to provide a cleaning medium that can satisfy such needs.

In order to achieve the above object, the present invention is a cleaning medium that is repeatedly applied to an object to be cleaned, and the inorganic crystals are laminated in a laminated state so that the inorganic crystals peel and the cleaning performance is repeatedly exhibited. It has a structure bound with an organic substance.
Further, the present invention provides a dry cleaning method in which a plurality of cleaning media are caused to fly by an air current, and the cleaning medium is repeatedly applied to an object to be cleaned for cleaning. A cleaning medium having a structure in which an inorganic crystal is bound to an organic material in a stacked state so as to be expressed is used.

According to the present invention, since the inorganic crystals are peeled off and the cleaning performance is repeatedly exhibited, sufficient cleaning performance can be exhibited even against hard and strong fixed dirt.
Moreover, only the dirt adhering to the surface layer can be selectively removed without damaging the base material of the object to be cleaned, and a high-quality cleaning surface can be obtained.

It is a figure which shows the principal part of the dry cleaning apparatus which concerns on one Embodiment of this invention. It is a figure for demonstrating the cleaning operation | movement of the dry cleaning apparatus. It is a schematic diagram which shows the cross section of the washing | cleaning medium which consists of a structure which bound the crystal | crystallization of the inorganic substance with the organic substance. It is a schematic diagram which shows the condition where the surface layer of the cleaning medium peels. It is a figure which shows the peeling characteristic of each cleaning medium. It is a photograph image figure which shows the peeling outline when quartz glass is used as a washing | cleaning medium. It is a photograph image figure which shows the peeling outline when using PDP glass as a washing | cleaning medium. It is a photograph image figure which shows the peeling outline when using TCM glass as a washing | cleaning medium. It is a photograph image figure which shows the peeling outline when an insulator is used as a washing | cleaning medium. It is a photograph image figure which shows the peeling outline when glass beads are used as a washing | cleaning medium. It is a photograph image figure which shows the peeling outline when melamine is used as a washing | cleaning medium. It is a photograph image figure which shows the peeling appearance when using a clam shell as a cleaning medium. It is a photograph image figure which shows the peeling appearance when using a swordfish shell as a washing | cleaning medium. It is a characteristic view which shows a peeling profile when 4g of each cleaning medium is used. It is a characteristic view which shows a peeling profile when 6g of each cleaning medium is used. It is a photograph image figure which shows the shape change before and behind use when a washing | cleaning medium is a clam shell. It is a photograph image figure which shows the shape change before and behind use when a washing | cleaning medium is a seashell of a sword. It is a figure which shows the peeling characteristic which made the washing | cleaning target object the commercially available coating film at the time of using the cleaning medium as a seashell of a swordfish and a melamine shot material. It is a photograph image figure which shows the peeling external appearance of a commercially available coating film, (a) The figure at the time of using a melamine shot material as a washing | cleaning medium, (b) The figure at the time of using a swordfish shell as a washing | cleaning medium, (c) These are figures at the time of using the cleaning medium which consists only of inorganic substances. It is an excerpt from the website showing the biomineralization of shells. It is an excerpt from the website (http://www.tkx.co.jp/Whetstone Business / Whetstone Structure) showing the structure of the whetstone.

Embodiments of the present invention will be described below with reference to the drawings.
First, how the present invention was established will be described. In view of the above problems, the present inventors have focused on the structure of biomineral, which is a mineral produced by living organisms.
Examples of biominerals generated by biomineralization (reference URL: http://kato.tu-tokyo.ac.jp/res_bmn.html) include shells.
For example, as shown in FIG. 20, the pearl layer has a structure in which calcium carbonate and a bio-organic polymer are laminated, and exhibits high mechanical strength due to a precise composite structure. The bio-organic polymer functions as a binder that binds calcium carbonate in each layer.
The crustacean exoskeleton, which consists of calcium carbonate and organic molecules, like the nacre, contains more organic components such as chitin and protein, and is therefore more flexible, lighter, and stronger.

If such a biomineral structure is used as a cleaning medium, it is assumed that the inorganic material on the surface layer can provide hardness that is difficult to damage the base material of the object to be cleaned and can remove dirt.
Then, the inorganic material finishes the role of the cleaning function to some extent and is peeled off by the impact at the time of collision with the object to be cleaned, and the cleaning function is restored again by exposing the new inorganic material in the lower layer. It came to the conclusion that the cleaning function may be sustained.
Thus, an attempt was made to use a structure such as biomineral as a cleaning medium.

The use of shells as a cleaning medium has been known for some time and includes the following.
Patent Document 2 describes that a shell is pulverized to a uniform particle size to form a powder or a granule, which is used as a polishing / cleaning material by rubbing.
Patent Document 3 describes a technique in which shell powder particles are applied to an object at a pressure of 490 kPa or less in an air blast method.
Patent Document 4 describes that solid particles obtained by pulverizing scallop shells collide with the surface of a workpiece to perform processing.
Patent Document 5 describes a technique in which, in an injection blasting apparatus, crushed grains of shells are injected while being quantitatively supplied by a rotary feeder.

However, none of the above-mentioned conventional technologies pay attention to the recovery phenomenon of the cleaning function based on the “laminate structure of an inorganic substance using an organic substance as a binder” of a shell.
That is, in patent document 2, it is only used as a powdery abrasive. The size of the powder is in units of microns, and the “inorganic laminated structure with an organic substance as a binder” cannot be grasped.
In patent documents 3-5, it is only used as a blast material for obtaining a one-time collision functionally.

Embodiments of the present invention will be specifically described below.
First, the configuration and cleaning mechanism of the dry cleaning apparatus according to this embodiment will be briefly described.
As shown in FIG. 1, a cleaning casing 10 having a mesh-like separation plate 10C as a porous means is connected to a suction device 20A as a suction means by a flexible intake duct 20B through an intake port 10J. Yes.
A cylindrical inner cylinder member 10D that defines a swirling axis of the swirling airflow is provided at the inner center of the upper housing 10A.
A rectangular opening 10E is formed in the cylindrical portion of the upper housing 10A, and an inlet 10F as a ventilation path is formed.

When the suction device 20A is operated with the opening 10E open, a large amount of external air mainly enters the upper housing 10A from the opening 10E as shown in FIG. 2 (b).
Since the air that has entered is sucked through the separation plate 10C, the annular internal space defined by the inner cylindrical member 10D of the upper housing 10A has a negative pressure.
In this state, the cleaning medium PC is sucked from the opening 10E and taken into the housing. The suctioned cleaning medium PC is adsorbed and held on the separation plate 10C by a negative pressure.

As shown in FIG. 2A, when the opening 10E is brought into contact with the object to be cleaned in this state, external air is introduced from the inlet 10F at a high speed, and a swirling airflow RF is formed. The cleaning medium PC circulates and flies through the internal space with a swirling airflow.
The cleaning medium is accelerated by the high-speed airflow from the inlet 10F, flies linearly, and collides with the object to be cleaned exposed to the opening 10E. This operation is repeated to remove the dirt on the object to be cleaned.
The removed removed matter (dirt) and the debris of the cleaning medium pass through the separation plate 10C to the intake port side.
The supply of the cleaning medium PC into the housing is not limited to the above. For example, you may supply from the inlet 10F in the state which obstruct | occluded the opening part 10E.

In the present embodiment, clams of clams and swordfish are used as the cleaning medium PC.
The clams and clams shells are due to biomineralization, and have a structure similar to that shown in FIG.
To explain this schematically, as shown in FIG. 3, calcium carbonate 1 which is an inorganic crystal is bonded by a binding layer (organic layer) 2 containing protein, and the inorganic layer is laminated in the thickness direction as a whole. It has a structure.
The thickness t1 of the calcium carbonate 1 is larger than the thickness t2 of the bind layer 2.
The surface of the cleaning medium PC is exposed to the calcium carbonate 1 which is hard and has a sharp edge. When the calcium carbonate 1 collides with the cleaning target object CO, a function of removing the dirt attached to the surface of the cleaning target object CO appears. .

While repeatedly colliding with the swirling airflow, as shown in FIG. 4, the inorganic crystals on the surface layer are peeled off together with the bind layer 2 by impact, and new inorganic crystals existing in the lower layer are exposed on the surface layer.
That is, when the inorganic crystal peels, the organic substance containing the protein as the binding material also peels at the same time.
As a result, inorganic crystals with hard edges and sharp edges are present on the surface, and the cleaning performance is restored. Since this surface regeneration function is repeated, a certain cleaning performance is maintained.
By repeatedly exhibiting the cleaning performance in the initial stage of use, sufficient cleaning performance can be exhibited even against strong fixed dirt such as film-like dirt.

[Example 1]
FIG. 5 shows the experimental results of the cleaning performance of a plurality of cleaning media including clams and clams shells.
As a suction device (dust collector), high vacuum high power cleaner SAS-3000H100 (manufactured by Higashihama Kogyo Co., Ltd., static pressure 30 kPa), Ver. 13.4_LQi6c (hose outlet diameter φ38 mm; type without elbow) was used.
The peel weight and peel profile were measured with Foam Talysurf S6 (Rank Taylor Hobson).

The cleaning housing of the dry cleaning apparatus shown in FIG. 1 is filled with 4 g and 6 g of each cleaning medium, and is allowed to fly for 60 seconds, and a commercially available free-cutting resin is peeled off assuming that it is a cleaning object having a strong fixed stain. did.
As the free-cutting resin, conductive unilate (registered trademark: Unitika Ltd.) was used.
In FIG. 5, quartz glass is recycled quartz glass, PDP glass is recycled glass for plasma display, TCM glass is recycled glass as a transparent crystalline material, and insulator is used as an insulating material for electric wires made of silicon dioxide or alumina. It means regenerative eggplant.

The particle size of the cleaning medium excluding clams and swordfish shells is 1.5-2.5 mm. Melamine is obtained by processing a melamine resin into a granular shot material (hereinafter also referred to as “melamine shot material”).
The clam shell is crushed with a plastic hammer, and the size of the crushed pieces is about 10 to 30 mm.
Shijimi's shell was hard and difficult to crush with a plastic hammer, so the same size was put into the cleaning case.
In addition to the experiment shown in FIG. 5, the experiment was performed using small spherical glass beads.

As is clear from FIG. 5, when the peeled weight was used as a reference, the order was Shijimi shell> TCM glass>insulator> clam shell.
Cleaning media other than glass beads resulted in a larger peel weight than melamine which is generally used as a cleaning medium at present in this type of dry cleaning apparatus.
FIGS. 6 to 13 show the appearance of peeling with each cleaning medium. The left side of each photographic image corresponds directly below the inlet of the opening.

In the recycled glass, coconut, and shell cleaning media, the entire surface of the object to be cleaned is white and clearly separated.
In melamine, peeling is clear only on the substantially half surface on the inlet side.
Glass beads could hardly be peeled off, but rather a tendency to slightly increase the weight of the object to be cleaned due to adhesion of the medium residue.

FIG. 14 shows the peeling profile of the object to be cleaned when 4 g of each cleaning medium is used, and FIG. 15 shows the peeling profile of the object to be cleaned when 6 g of each cleaning medium is used.
As apparent from the comparison between FIG. 14 and FIG. 15, regarding the peeling profile, the tendency is the same even when the weight of the cleaning medium is 4 g and 6 g, but the maximum peeling depth is large when the weight is 6 g.
Further, when the weight is 6 g, the range in which the depth is greater than 0 becomes wider, and it can be said that the contribution to the spread of the peeled area due to diffusion collision is large.
Based on the peel depth, it was found that regenerated cocoons> regenerated TCM glass> swordfish shells> clams shells, which can deepen the object to be cleaned rather than melamine.

For diffusion collisions, a deeper profile than melamine was obtained with all cleaning media except glass beads.
This contributes to the shade of the peeled appearance shown in FIGS. 6 to 13 and is considered to correlate with the fact that the peeled weight was larger than that of melamine in all cleaning media except melamine shown in FIG. It is done.
That is, it can be said that all the cleaning media except for melamine shown in FIG. 5 may have a peeling performance superior to that of melamine, although the thickness of the coating film has an influence on the removal of the coating film stain.
This tendency is noticeable in quartz glass. Although the maximum peel depth is shallower than melamine, the peel weight is reversed.

  Table 1 shows the average depth and the maximum peel depth determined from the peel profile. Calculation is performed within a range where a clear peeling profile is observed between 0 and 25 mm on the horizontal axis in FIGS.

  Table 2 shows the order of cleaning media with respect to peel weight, average depth, and maximum depth.

As is apparent from Table 2, the peel weight is greater than melamine in all cleaning media.
The average and maximum depth is higher than melamine except for quartz glass and PDP glass.

FIGS. 16 and 17 show changes in shape of the clam and swordfish shells before and after use of the cleaning medium.
In the case of clams and clams, it can be seen that the shape changes due to repeated collisions even if they are thrown in as they are.
As is well known, shells such as clams and swordfish exist in nature, and their production costs are zero compared to recycled glass and recycled insulators such as quartz glass, PDP glass, and TCM glass.
In food companies that process the contents of shells, the shells themselves are treated as industrial waste, and there is little cost of acquisition.

Thus, if shells such as clams and swordfish are used as a cleaning medium that is repeatedly applied to the object to be cleaned in order to make use of the characteristics of the laminated structure, it is higher than the resin pieces such as melamine currently used. Cleaning performance can be obtained, and the application range for the type of cleaning object can be expanded.
In addition, since the material cost is hardly incurred, it is possible to contribute to the reduction of the running cost of the cleaning work.
As shown in FIG. 5, by using shells such as clams and swordfish as a cleaning medium, it is possible to obtain a cleaning capability equivalent to or higher than that of recycled glass or the like.
This also contributes greatly from the viewpoint of effective use of industrial waste.

[Example 2]
In the same manner as in Example 1, the cleaning medium of the dry cleaning apparatus was filled with a cleaning medium, and a commercially available coating film (baked paint plate black melamine baking coating, undercoat electrodeposition coating, coating film thickness 40 μm; manufactured by MISUMI) Was peeled off while scanning the moving cleaning case.
The scanning conditions were 2 mm / sec and peeling for 40 sec. As a washing medium, swordfish shells and melamine shot material were similarly filled.
The respective peel weights are shown in FIG. Moreover, each peeling external appearance is shown in FIG.
As shown in FIGS. 19 (a) and 19 (b), the coating film was peeled off only sparsely with the melamine shot material, whereas the coating film was peeled off almost completely with the seashell of Shijimi.
No scratches on the base material are seen, and a high-quality cleaning surface is obtained.

[Comparative Example 1]
In the same manner as in Example 2, the cleaning medium of the dry cleaning apparatus was filled with the cleaning medium, and the commercially available coating film was peeled off while moving the cleaning casing and scanning.
The scanning conditions were 2 mm / sec and peeling for 40 sec.
The washing medium was similarly filled with calcium carbonate. The peeled appearance of the coating film is shown in FIG. As a result, the coating film could hardly be peeled off.
Calcium carbonate here is an inorganic crystal contained in the shell, but even if the inorganic crystal itself is used as a cleaning medium, it does not have a laminated structure of inorganic and organic materials such as a shell, so the recovery phenomenon of the cleaning function can be obtained. Therefore, the edge is worn and the cleaning function is deteriorated early.

[Comparative Example 2]
In the same manner as in Example 2, the cleaning medium of the cleaning device was filled with the cleaning medium, and the commercially available coating film was peeled off while moving the cleaning case and scanning.
The scanning conditions were 2 mm / sec and peeling for 40 sec.
As a cleaning medium, a polyethylene terephthalate (PET) film having a thickness of 125 μm and a size of 6 × 6 mm was used.
As in the case of calcium carbonate, the coating film could hardly be peeled as a result.
This is because the PET film has a thin structure like a crushed piece of a shell, but has insufficient hardness to peel off the coating film.

As shown in FIG. 21, the grindstone has a structure in which the abrasive grains are hardened in layers using a binder, so it looks like a structure similar to a shell, but because the abrasive grains and the binder are randomly bonded, It is difficult to always expose hard abrasive grains to the surface layer.
For this reason, the structure of the grindstone is not a reference material for reliably obtaining the recovery performance of the cleaning performance.

In the above embodiment, an example in which shells such as clams and swordfish are used as a cleaning medium has been shown, but a good cleaning function can be obtained even using shells of shellfish such as crabs and shrimps.
Crabs and shrimp shells contain 20-30% chitin, and the other ingredients are protein and calcium carbonate.
The crab shell has a structure in which protein, which is organic, and calcium, which is inorganic, are bound to chitin, which is fibrous.

[Example 3]
In the same manner as in Example 1, the cleaning housing of the dry cleaning apparatus was filled with a cleaning medium, and a commercially available wax, File-A-Wax (manufactured by ferris; hereinafter, simply referred to as “wax”) was peeled off for 30 seconds. .
As a cleaning medium, a crab shell of a red crab as a shell and a melamine shot material were filled, respectively.
Crab shells were prepared by washing and drying the crab shells, pulverizing them with a force mill, and sieving to select a size of 2.8 mm to 4 mm.

Although the cleaning medium made of crab shell becomes smaller in size than the initial state due to the impact during cleaning, the cleaning ability does not decrease because it breaks like a shell and a new edge is generated.
As a result, the crab shell showed a peeling performance superior to that of the melamine shot material.

[Example 4]
In the same manner as in Example 3, the wax was peeled off for 30 seconds.
As cleaning media, crab shells of crabs and melamine shot material were filled, respectively.
Crab shells were prepared by crushing crab shells of red crab, decalcified with dilute hydrochloric acid (calcium removed), washed with water, dried, pulverized with a force mill, and screened to select a size of 2.8 mm to 4 mm. .
Compared with the crab shell containing calcium, the wax peel weight was small, but the peel performance was equivalent to that of the melamine shot material.

[Example 5]
In the same manner as in Example 3, the wax was peeled off for 30 seconds.
As cleaning media, crab shells of crabs and melamine shot material were filled, respectively.
The crab shell was deproteinized with an aqueous sodium hydroxide solution after crushing the crab shell of the crab shell. That is, chitin fiber and calcium remain.

After dehydration and drying, it was similarly pulverized with a force mill and sieved to produce a size of 2.8 mm to 4 mm.
The crab shell from which the protein was removed had lower wax release performance than the melamine shot material.
The reason is that in the crab shell from which the protein is removed, the mechanism for repeating the surface regeneration function is not expressed.

[Example 6]
In the same manner as in Example 3, the wax was peeled off for 30 seconds.
As cleaning media, crab shells of crabs and melamine shot material were filled, respectively.
The crab shell was crushed from the crab shell of the red crab, decalcified with dilute hydrochloric acid (calcium removed), washed with water, and further deproteinized with an aqueous sodium hydroxide solution.
After dehydration and drying, it was similarly pulverized with a force mill and sieved to produce a size of 2.8 mm to 4 mm.
The crab shell made of only chitin fiber has lower wax release performance than the melamine shot material.
This is because also in this example, the mechanism for repeating the surface regeneration function does not appear.

In Japan, for example, more than 30,000 tons of crabs have been landed nationwide in FY2010.
Such crab is currently consumed only in its contents and its shell is discarded.
By using the crab shell, which is a waste biomass, as a cleaning medium as described above, it is excellent in cost effectiveness.
In addition, it is environmentally friendly and can greatly contribute to the prevention of air pollution caused by incineration and marine pollution caused by dumping into the sea.

In the above embodiment, the shell or shell as biomineral is used as the cleaning medium, but the present invention is not limited to biomineral.
That is, it may be an artificial structure as long as it is a structure in which an inorganic crystal is bound with an organic substance and the surface layer replacement function is expressed by repeated collisions.

DESCRIPTION OF SYMBOLS 1 Calcium carbonate as an inorganic crystal 2 Organic substance containing protein 10 Dry cleaning housing 10C Separation plate as porous means 10E Opening 10F Inlet as an air passage 10J Intake port 20A, 20B Suction device as suction means CO Cleaning object Things PC Cleaning media RF Swirl

JP 2012-50973 A JP 2000-351994 A JP 2004-243423 A JP 2008-110454 A JP 2007-196111 A

Claims (11)

A cleaning medium that is repeatedly applied to an object to be cleaned,
A cleaning medium having a structure in which inorganic crystals are bound to each other in a laminated state with an organic substance so that the inorganic crystals peel and the cleaning performance is repeatedly exhibited. The cleaning medium according to claim 1,
A cleaning medium, wherein the organic substance contains a protein. The cleaning medium according to claim 1 or 2,
The cleaning medium, wherein a thickness of the inorganic layer made of the inorganic crystals is larger than a thickness of the organic layer made of the organic matter. The cleaning medium according to any one of claims 1 to 3,
A cleaning medium, wherein the cleaning medium is used in a dry cleaning apparatus that causes a plurality of cleaning media to fly by a swirling airflow and repeatedly applies the cleaning medium to an object to be cleaned to clean the object to be cleaned. In a dry cleaning apparatus that causes a plurality of cleaning media to fly by an air current and applies the cleaning medium to an object to be cleaned to clean the object to be cleaned.
An internal space for flying the cleaning medium;
An opening that abuts the object to be cleaned and collides the object to be cleaned with the cleaning medium flying in the internal space;
A ventilation path for passing air from outside to the internal space;
An air inlet that generates a swirling airflow in the internal space by sucking air introduced into the internal space through the air passage;
Porous means for passing the removed object removed from the object to be cleaned to the inlet side;
Suction means connected to the inlet;
Have
The dry cleaning apparatus according to any one of claims 1 to 4, wherein the cleaning medium is one according to any one of claims 1 to 4. In a dry cleaning method in which a plurality of cleaning media are caused to fly by an air flow, and the cleaning medium is repeatedly applied to an object to be cleaned for cleaning,
A dry cleaning method using a cleaning medium having a structure in which inorganic crystals are bound to each other in a laminated state with an organic substance so that the inorganic crystals are peeled off and the cleaning performance is repeatedly exhibited as the cleaning medium. The dry cleaning method according to claim 6, wherein
A dry cleaning method, wherein the organic substance of the cleaning medium contains a protein. In the dry cleaning method according to claim 7,
A dry cleaning method, wherein a shell is used as the cleaning medium. The dry cleaning method according to claim 8, wherein
A dry cleaning method, wherein the shell is a clam or swordfish shell, which is used as it is or crushed. In the dry cleaning method according to claim 7,
A dry cleaning method, wherein a shell is used as the cleaning medium. The dry cleaning method according to claim 10, wherein
A dry cleaning method characterized by using a crab shell as the shell.

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