JP6061138B2 - Sponge scrubber for car washing - Google Patents

Description

  The present invention is capable of fine foaming, can hold the foam for a long time, and less leaks the foam to the non-cleaning side that is the side and back of the cleaning sponge scrubber. Surfaces such as painted surfaces, glass surfaces, metal surfaces, resin surfaces, and rubber surfaces of automobiles can be washed smoothly and easily without damaging, and also have excellent water and air permeability. Therefore, the present invention relates to a sponge scrubper for washing automobiles that has a fast drying speed after use and can thus maintain the above-described effect over a long period of time.

  Conventionally, this type of scrubbing brush has (1) three foam layers and grooves formed on the surface of the middle layer to improve foaming (Patent Documents 1 and 2), (2) retention of cleaning agent For this purpose, the surface layer is provided with a cross-shaped slit (Patent Document 3), (3) a high-density sponge layer for holding the polishing layer and the cleaning agent, and a low density for foaming and draining. What consists of a sponge layer (patent document 4) is known.

However, none of these scourers are suitable for washing modern automobiles. For example, the scourer of (1) above does not produce fine bubbles, and cannot obtain a so-called bubble cleaning action. Even if rough foam is generated, this foam cannot be maintained for a long time, and requires re-foaming work during the cleaning operation. However, the scouring of (3) is not necessarily good in foaming as well.
Further, all of these scrubs have a slow drying rate after use, and therefore the foam layer constituent material is rapidly deteriorated by residual moisture, and the scrubbing replacement frequency becomes great.

  In addition, the above-mentioned conventional scrubber has a large amount of foam, not only on the cleaning surface but also on the non-cleaning surface side. There is also the problem of getting the entire jacket wet.

In addition, as a kitchen scrub, the first layer is made of low-density urethane that is strong and has good drainage, and the second layer is made of fine, high-density urethane with good foaming and slitting. In addition, there is a sponge sponge for a kitchen made of a soft nylon nonwoven fabric in which the third layer removes dirt firmly.
This sponge scrubber is said to be suitable for cleaning plastic products, enamel products, pottery products, glass products, etc., and eventually the dirt adhering to the surface of these products is physically scraped with a soft nylon nonwoven fabric. In particular, it is surmised that the foam caused by the cleaning agent and water is caused by putting the cleaning agent at the interface between the surface and the soil in order to raise the soil to some extent from the product surface.
Therefore, it is understood that the product surface is suitable for materials with relatively high hardness such as enamel, ceramics, and glass, and plastic is also considered suitable for products with relatively high hardness. There is a risk of scratching the surface.

Utility Model Registration No. 3,173,897 Utility Model Registration No. 3,173,297 Utility Model Registration No. 3,118,960 Japanese Utility Model Publication No. 61-1003008

  In consideration of the above situation, the present invention is a cleaning sponge scrub that can sufficiently cope with a modern car cleaning sponge scrubber, particularly capable of fine bubbling and less leaking of foam to the non-cleaning surface side. In addition, it is possible to hold the foam for a long time on the cleaning surface of the scrubbing brush, and in addition to being able to clean the surface of the automobile smoothly without damaging it, the above performance can be maintained for a long time. It is an object of the present invention to provide a sponge scrubber for car cleaning that can be maintained over a wide range.

In order to achieve the above-mentioned problem, the sponge scrub for washing automobiles of the present invention
(1) A foam is laminated in a three-layer structure of an upper layer, a middle layer, and a lower layer,
The surface opposite to the middle layer contact surface in the upper layer is subjected to uneven processing,
The upper layer and the middle layer are polyurethane foams that have been subjected to film-free treatment to remove the cell membrane, the upper layer has a density of 10 to ³⁰ kg / m ³ , the middle layer has a density of 20 to 50 kg / m ³ , and the middle layer has a density of the upper layer At least 5% higher,
A plurality of cruciform slits or holes are provided in the middle layer from the surface in contact with the upper layer to the back surface in contact with the lower layer.
In the above, (2) the lower layer foam is preferably a polyurethane foam or a polyethylene foam that has not been subjected to film-free treatment.
Note that (3) the cross-shaped slit or hole in the middle layer is 30% or more, preferably 50% or more, more preferably, the thickness of the middle layer from the surface in contact with the upper layer to the back surface in contact with the lower layer as described above. Preferably it has a depth of 100%.
(4) In the case where a cross-shaped slit is provided in the middle layer, the length of each side in the vertical and horizontal directions is preferably 0.5 to 20 mm, and when the hole is provided, the diameter of the hole is preferably 0.5 to 15 mm. Such slits or holes may be provided randomly as viewed from the surface of the middle layer in contact with the upper layer, but are preferably provided in an aligned state along the vertical and horizontal directions or diagonal lines. In this aligned state, the rows may be arranged in a staggered manner, and the intervals between the cross-shaped slits or holes are preferably the same size.

Moreover, (5) Each layer thickness of an upper layer, a middle layer, and a lower layer occupies 25 to 40% of upper layers, 45 to 60% of middle layers, and 15 to 30% of lower layers with respect to the total thickness of all three layers. Is preferred, and
(6) The height of the convex portion in the upper layer is preferably 20 to 60% of the total thickness of the upper layer and the height of the concave portion is 20 to 60% of the total thickness of the upper layer.
The unevenness may be provided randomly as viewed from the upper layer surface side, but is preferably provided in an aligned state along the vertical and horizontal directions or diagonal lines. In this aligned state, the columns are arranged in a staggered manner. May be.

In general, the sponge scrubber for washing automobiles according to the present invention is used by bringing the upper layer into contact with an object to be washed such as a car body of an automobile and grasping the lower layer or middle layer by hand.
Therefore, in the cleaning operation, the automobile cleaning agent is supplied to the upper layer, and after the foaming, the operation is started with the upper layer directed toward the cleaning target side.

When the cleaning agent is supplied to the upper layer, the upper layer has been made non-film-treated, and a plurality of cross-shaped slits or holes provided in the middle layer allow the permeation and transfer from the upper layer to the middle layer, and has a higher density than the upper layer. Fine bubbles (ultrafine bubbles) are formed in the middle layer. Since the cross-shaped slits or holes are provided from the surface in contact with the upper layer in the middle layer toward the back surface in contact with the lower layer, the transition action to the middle layer of the cleaning agent is further ensured. Moreover, since the middle layer uses a foam having a higher density than the upper layer, the side surface of the scrubbing surface is less likely to leak.
The cruciform slit or hole can be provided by a conventionally used method, and for example, a Thomson type punching process or the like can be used.

In addition, it is preferable to use a lower foam layer that has not undergone film-less treatment. By having such a lower layer, the cleaning agent that has migrated via the upper layer and the middle layer is used in the lower layer. The structure is such that the transition is stopped and it is difficult to transition to the back surface on which the uneven processing is not performed.
Therefore, the cleaning agent stays in the upper layer and the middle layer during the cleaning operation, and can generate bubbles over a long period of time. Therefore, there are few bubble leaks to a side surface and a back surface, and the scrubber of this invention is excellent in workability | operativity.

Further, according to the scrubber of the present invention, the cells in the polyurethane foam of the upper layer and the middle layer are in a state of communication after being made film-free, and water and air are added to the cleaning agent supplied to the upper layer, and these washings are performed. The agent, water, and air can move freely in the cell in communication.
This movement of the cleaning agent, water, and air also occurs in a plurality of cross-shaped slits or holes provided in the middle layer, further increasing the possibility of movement of the cleaning agent.
Then, the cleaning operator grips the scrubbing brush of the present invention, and the pumping action is expressed by increasing or decreasing the gripping force, and the air, water, and cleaning agent are mixed and mixed together. Air and water act on the cleaning agent to generate bubbles. This bubble once occurred by moving up and down in the slits and holes provided in the middle layer by the above-mentioned pump action, and freely moving in the slanting direction in the up and down and left and right directions in the extremely fine communication cell of the polyurethane foam. The bubbles become finer and finer bubbles. The ultrafine bubbles move from the concavo-convex surface of the upper profile processed to the surface to be cleaned of the automobile. In this way, the ultrafine bubbles supplied one after another to the upper layer are accumulated between the uneven surface having a surface area larger than that of the flat surface and the surface to be cleaned, so that the cleaning operator can clean the scrubber of the present invention. By moving the surface up and down, left and right, or diagonally, the bubbles (and a part of the projections) mainly rub against the surface to be cleaned, and in other words, the bubbles remove the dirt adhering to the surface to be cleaned. The action of dissolving and rubbing dirt on the surface to be cleaned with foam occurs.

Therefore, according to the scrubbing brush of the present invention, the object to be cleaned can be cleaned mainly by fine fine bubbles (and contact of the convex portions provided on the upper layer), and the vehicle body can be cleaned smoothly and without being damaged. be able to.
Moreover, since the lower layer is made of a foam that has not been made film-free, it is difficult for the ultrafine bubbles generated during this cleaning operation to move to the non-cleaning surface side, and the cleaning operation is performed very efficiently. Can do. The so-called stop action for preventing the movement of foam or cleaning agent and water to the worker side is more effective by making the cross-shaped slit or hole less than 100% of the thickness of the middle layer, that is, the depth not penetrating the middle layer. To express. However, in order to generate ultrafine bubbles more efficiently, it is preferable to penetrate the depth of the cross-shaped slit or hole in the middle layer, and the depth of the cross-shaped slit or hole is appropriately determined according to the required performance. To do.

And in the scrubbing of the present invention, the upper layer which has been made filmless and has an uneven shape, the middle layer which has been made filmless and has a cross-shaped slit or hole, the density difference between the upper layer and the middle layer, and other physical properties Due to the action of the combination of the lower layer that is not subjected to film-less treatment, fine ultrafine bubbles are generated as described above, and at the same time, the ultrafine bubbles are retained in the upper layer and the middle layer for a long time during the cleaning operation. There are few bubble leaks to the non-cleaning surface side such as the back surface, and the cleaning operation can be made extremely smooth.
Moreover, the scrubbing after the completion of the cleaning operation is generally washed and dried, but the cleaning operation as well as the drying operation can be completed in a very short time according to the scrubbing brush of the present invention having the above-described configuration. .

It is an external appearance schematic diagram explaining the example of one embodiment of the scrubber of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram explaining one embodiment example of the middle layer of the scrubber of this invention, (A) is a top surface schematic diagram, (B) is a schematic diagram which shows one embodiment example of the II sectional view of (A), (C) is the schematic diagram which shows the other example of an embodiment of the II sectional view of (A). It is a cross-sectional schematic diagram explaining the example of one embodiment of the upper layer of the scrubbing of this invention.

As shown in FIG. 1, the scrubbing of the present invention is obtained by laminating a foam in a three-layer structure of an upper layer 1, a middle layer 2, and a lower layer 3, and the upper layer 1 The surface opposite to the contact surface has a concavo-convex shape P. The middle layer 2 is located below the upper layer 1, and the lower layer 3 is located further below the middle layer 2. In addition, the formation method in particular of the said uneven | corrugated shape P is not restrict | limited, A conventionally well-known method is used, for example, profile processing, binary processing, etc. are mentioned. Also, the means for laminating the layers is not particularly limited, and lamination using a general adhesive may be used, or lamination using frame lamination or the like may be used. In this case, it is essential to devise the amount of adhesive used and the amount of melting in the frame laminate so as not to hinder the transfer of adhesive, water, air between each layer or fine fine bubbles generated in the layer. is there.
The upper layer 1 and the middle layer 2 are made of a polyurethane foam subjected to film-free treatment, and the film-free polyurethane foam of the upper layer 1 has a density of 10 to ³⁰ kg / m ³ , and the filmless polyurethane foam of the middle layer 2 has a density of 20 to 50 kg / The polyurethane foam selected from the range of m ³ and used for the middle layer 2 has a density at least 5% higher than that of the upper layer 1.
As the film-less treatment method of the polyurethane foam of the upper layer 1 and the middle layer 2, a conventionally known method is used, for example, an explosion film-less treatment in which a foam is placed in a closed space and explode to destroy the cell wall, Examples thereof include a solvent film-less treatment for dissolving a cell membrane with a solvent.

  The upper layer 1 and the middle layer 2 have a higher density than the upper layer 1 so that the middle layer 2 generates fine ultrafine bubbles, and keeps the bubbles in the scrubbing and is smooth on the upper layer 1 side during the cleaning operation. To migrate. It is important that the difference in density be at least 5% higher for the middle layer 2 than for the upper layer 1. On the other hand, if the difference is too large, inconveniences are caused not only in terms of cleaning workability and usability but also in terms of mechanical strength, so the upper limit is 500%, preferably about 5 to 150%.

The middle layer 2 mainly has a role of generating fine fine bubbles, and the upper layer 1 has a role of smoothly transferring the bubbles generated in the middle layer 2 to the surface to be cleaned.
If the density of the upper layer 1 and the middle layer 2 is within the above range, these roles can be sufficiently fulfilled. If the density of the middle layer 2 is less than 20 kg / m ³ , the foam diameter generated by the cleaning agent, water and air becomes too large, so that the dirt on the surface to be cleaned is dissolved by the foam and rubbed off. In addition to the difficulty of becoming fine and fine bubbles necessary for the above, the durability of the scrubber body is reduced. In addition, bubbles generated in the middle layer 2 are less likely to move to the upper layer 1, and bubble leakage is likely to occur on the side surfaces and the like. On the other hand, when the density of the middle layer 2 is higher than 50 kg / m ³ , it becomes difficult for the cleaning liquid or the like to penetrate from the upper layer 1, and foaming becomes worse.
Further, when the density of the upper layer 1 is less than 10 kg / m ³ , the bubbles generated in the middle layer 2 easily migrate to the upper layer 1, but the growth of bubbles in the upper layer 1 cannot be suppressed, and the particle size of the bubbles is large. In addition, the durability of scrubbing is poor. On the other hand, if the density of the upper layer 1 is higher than 30 kg / m ³ , in addition to the possibility of damaging the object to be cleaned at the time of cleaning, bubbles generated in the middle layer 2 are difficult to move to the upper layer 1.

The upper layer 1 is a surface that directly faces the surface to be cleaned. If the surface is too hard, the surface to be cleaned may be damaged when contacting the object to be cleaned. It is lowered and durability is inferior.
On the other hand, the middle layer 2 is a place where the washing operator directly receives the strength of the gripping force when the scrubbing brush of the present invention is gripped, and if it is too hard, it is necessary to increase the gripping force. If it is too soft, like the upper layer 1, the mechanical strength is lowered and the durability is inferior.
For this reason, the polyurethane foam used for the upper layer 1 preferably has a hardness of 40 to 80 N, and the polyurethane foam used for the middle layer 2 preferably has a hardness of 100 to 150 N.
Furthermore, the number of cells per 25 mm in the middle layer 2 has an effect of affecting the size of the generated bubbles, that is, the fineness important in the present invention. If the number of cells in the middle layer 2 is too small, In other words, if the cell diameter is too large, the generated bubble diameter may become too large, which may make it difficult to generate fine ultrafine bubbles that are essential for washing with bubbles, and conversely, if the number of cells is too large, For example, if the cell diameter is too small, fine bubbles can be generated, but it is difficult for the cleaning liquid to penetrate and drying after the cleaning operation may be difficult. For this reason, the number of cells in the middle layer 2 is preferably in the range of 40 to 80 cells / 25 mm.
On the other hand, the upper layer 1 does not destroy fine bubbles mainly generated in the middle layer 2 or grow the bubble diameter, and has a role of transferring the fine bubbles from the middle layer 2 to the surface to be cleaned as it is. In realizing this role effectively, if the number of cells is small, the transition is easy, but if the number of cells is too small, that is, if the cell diameter is too large, fine bubbles generated in the middle layer are There is a possibility that the restraint between the gaps is released and the inside of the upper layer 1 grows greatly during the transition. In addition, when the number of cells is too large, that is, when the cell diameter is too small, the growth of bubbles can be suppressed, but the bubble migration from the middle layer 2 is inhibited, and not from the uneven surface of the upper layer 1, but from the side surface of the middle layer. There is a risk of bubbles leaking. For this reason, the number of cells in the upper layer 1 is preferably in the range of 30 to 60 cells / 25 mm.
In the number of cells in the upper layer 1 and the middle layer 2, it is preferable that the number of cells in the middle layer 2 is larger than that in the upper layer 1 because the ultrafine bubbles generated in the middle layer 2 are more easily transferred to the upper layer 1.

In addition, the middle layer 2 has a filmless treatment as described above and is in a communicating state, and as shown in FIG. 2A, a cross-shaped slit or hole, in the figure, a cross-shaped slit S is formed. The fine bubbles generated in the middle layer 2 as well as the cleaning agent, water, and air flow back and forth in the communicating middle layer 2 and the cross-shaped slit S. Become.
As shown in FIG. 2B, the cruciform slit S extends from the surface 21 in contact with the upper layer 1 not shown in the figure to the back surface 22 in contact with the lower layer 3 not shown in the figure. A depth of 30% or more, preferably 50% or more, more preferably 100% of the thickness of the middle layer is provided, and a plurality of layers are provided.
With such a cross-shaped slit S, bubbles with cleaning agent, water, and air move freely and smoothly from the cross-shaped slit S into the communicating middle layer 2, and the fine bubbles that are generated are finer and finer. In addition, such fine fine bubbles are generated one after another.
Although not shown, the cruciform slit S may be replaced with a hole, and, like the cruciform slit S, this hole is also 30% or more of the thickness of the middle layer from the front surface 21 to the back surface 22 of the middle layer 2. Preferably, it has a depth of 50% or more, more preferably 100%, and if a plurality of them are provided, bubbles with cleaning agent, water, and air can freely and smoothly enter into the middle layer 2 in communication from the hole. The fine bubbles become finer and finer, and such fine bubbles are generated one after another.

In the cross-shaped slit or hole provided in the middle layer 2, when the cross-shaped slit S is provided, the length of each side in the vertical and horizontal directions is 0.5 to 20 mm, and when the hole is provided, the diameter is 0.5 to 15 mm. preferable. If the cross-shaped slits S and the holes have the above-mentioned dimensions, it is easy to move the bubbles with the cleaning agent, water, and air, and fine ultrafine bubbles may burst during movement or the bubble diameter may increase. In addition, the washing and drying of the scrubber itself after the completion of the cleaning operation is completed in a very short time.
Moreover, the cross-shaped slits S or holes may be provided at random when viewed from the surface 21 side of the middle layer 2, but are preferably provided in an aligned state in the vertical and horizontal directions or diagonal lines. This aligned state may be arranged in a staggered manner. The intervals between the cross-shaped slits S or the holes are preferably the same size, and by making the same size fine fine bubbles can be efficiently generated uniformly over the entire cleaning surface, The washing and drying of the scrubbing after the cleaning operation can be performed efficiently and uniformly over the whole scrubbing.

Fine fine bubbles generated uniformly in the entire scrubber as described above migrate from the middle layer 2 to the top layer 1, and the top layer 1 is the side opposite to the contact surface of the middle layer 2, that is, the surface of the scrubbing of the present invention. The uneven shape P is formed on the surface facing the object to be cleaned at the time of cleaning, and bubbles moving from the middle layer 2 accumulate in the uneven shape P. At the same time, since the upper layer 1 is also made film-free, bubbles can move inside the upper layer 1 or bubbles accompanying the cleaning agent, water, and air. The bubbles are fine and extremely fine even in the upper layer 1. Maintained.
Fine fine bubbles maintained in the concavo-convex shape P of the upper layer 1 or in the upper layer 1 are transferred from the scrubbing surface having the concavo-convex shape P onto the surface to be cleaned, and cleaning with bubbles is realized. Even if the upper layer 1 of the scrubbing comes into contact with the surface to be cleaned during this cleaning operation, the density of the top layer 1 is considerably low at 10 to ³⁰ kg / m ³ and the film is not formed. There are very few or no scratches. In addition, as described above, when the upper layer 1 has a hardness of 40 to 80 N and a cell number of 30 to 50/25 mm, this action / effect is exhibited even better.

As shown in FIG. 3, the height of the unevenness in the uneven shape P of the upper layer 1 is such that the height H1 of the convex portion is the entire thickness of the upper layer 1, and the height H2 of the concave portion is 20 times the total thickness of the upper layer 1. It is preferably ˜60%. When the height H2 of the concave portion is too high, in other words, when the concave portion is too shallow, not only the situation where the upper layer 1 is in direct contact with the surface to be cleaned becomes too much, but the bubble reservoir becomes too small, the foam retention decreases, The cleaning action due to is difficult to be expressed well. On the other hand, when the height H2 of the recess is too low, in other words, when the recess is too deep, the mechanical strength of the upper layer 1 may be lowered and the durability may be deteriorated.
In addition, the uneven shape P may be provided at random, but in order to make the bubble pool uniformly exist in the entire scrubber and to express the cleaning action by the foam uniformly in the entire scrubber, it is viewed from the surface side of the upper layer 1. It is preferable that they are arranged in a staggered manner along the vertical and horizontal or diagonal lines, or the alignment columns are shifted in a staggered manner. Of course, the intervals D of the convex portions are regularly arranged as the same dimension. Is preferred.

For the lower layer 3, a foam selected from polyurethane foam, polyethylene foam, and the like can be preferably used. As described above, in order to prevent the foam generated in the scrubber from moving to the non-cleaning surface side during the cleaning operation, there is no need. It is preferable to use a foam that is not subjected to film-forming treatment.
In addition, the foam of the lower layer 3 is not particularly limited as long as the density, hardness, and the number of cells per 25 mm are within a practical range as the lower layer 3 of the sponge scrub for car washing, but the above resin is used as a raw material. In general, the density, hardness, and the number of cells per 25 mm may be the same as those of the upper layer 1 or the middle layer 2. If it is this level, it has sufficient durability, and the cleaning operation by the fine bubble contact which is the object of the present invention can be performed stably for a long period of time. Even if the lower layer 3 is in direct contact, no discomfort is caused.

The thicknesses of the upper layer 1, the middle layer 2, and the lower layer 3 are not particularly limited, but for practical use as an automobile washing scrubber, the upper layer 1 is 25 to 40% and the middle layer 2 is 45% of the total thickness of the three layers. It is preferable that -60% and the lower layer 3 are 15-30%.
If the middle layer 2 is too thin, fine fine bubbles are not generated well. Conversely, if the middle layer 2 is too thick, the thickness of the upper layer 1 and the lower layer 3 is relatively too thin, and the bubbles on the non-cleaning surface side There is a risk of inconvenience such as an increase in the amount of migration.

Examples 1-8, Comparative Examples 1-5
Examples 1 to 8 and Comparative Examples 1 and 3 to 5 having a length of 150, a width of 100, and a thickness of 50 mm having the shape shown in FIG. The thickness of each layer was fixed at 15 mm for the upper layer, 25 mm for the middle layer, and 10 mm for the lower layer. Furthermore, a total of 84 cruciform slits with a side of 6 mm were provided in the middle layer 2 at intervals of 10 mm, 12 rows in the length direction (150 mm direction) and 7 rows in the width direction (100 mm direction). The depth of each slit is as shown in Table 1. In Comparative Example 2, since the upper layer is not profiled, the cleaning surface is flat, and other configurations are the same as in Example 1.

The physical property evaluation method was performed as follows.
[Bubbling: Foaming workability]
The prepared scrubbing was dipped in water, grasped by hand from the lower layer 3 side, and the gripping force was applied to wet the scrubbing. Next, one recess of the upper layer 1 of the scrubbet (Comparative Example 2 has a flat surface, so the center) is supplied with 10 cc of an automobile cleaner, dropped by the hand from the lower layer 3 side, and compressed by applying a gripping force. After that, the work was done once by releasing the grip.
The above operation was evaluated as follows in terms of the number of times required until good foaming could be confirmed.
◎: 1-3 times ○: 4-6 times △: 7-9 times ×: 10 times or more

[Bubbling: Foam quality]
The foam generated by the foaming operation was visually observed, and the state of the foam was evaluated as follows.
○: The bubbles are fine.
(Triangle | delta): Although the particle | grains of a bubble are fine on the whole, a big particle | grain is also mixed.
X: Large bubbles are conspicuous.

[Foam]
After performing the above lathering 10 times and confirming sufficient lathering, the same person has a scrub on the right hand, cleans the surface of the car that has been exposed to rain for one month in the factory, and with the scald on the right hand It was washed for 1 minute, and evaluated as follows based on the number of times the foaming operation was performed again in the car washing operation for a total of 2 minutes.
◎: 2 times or less ○: 3 times to 5 times △: 6 times to 8 times ×: 9 times or more

[Out of foam]
The foaming operation is performed 10 times, and after sufficient foaming is confirmed, the foam is washed off with water. As a method of washing with water, 500 cc of water is poured from above the washing surface of the upper layer 1, and compression / release by hand is repeated three times to check whether bubbles are formed. This operation was defined as one time, and the number of repetitions until no bubbles were generated was evaluated as follows.
◎: 2 times or less ○: 3-4 times △: 5-6 times ×: 7 times or more

[Drying]
100 cc of water is infiltrated into the prepared scrubber and the dry state is confirmed every hour. As conditions at this time, the temperature was kept constant at 25 ° C. and the humidity was 60%, and the time required for drying was evaluated as follows.
◎: 0 to 1 hour ○: 1 to 2 hours △: 2 to 3 hours ×: 3 hours or more

* 1: “Yes” means that the film was treated in the film-free treatment, and “Untreated” means that the film was not treated.
* 2: “Yes” indicates that the profile processing was performed, and “Unprocessed” indicates that the processing was not performed.

As shown in Table 1, Examples 1 to 8 were foamed well, the foam quality was fine, and the car could be washed efficiently because of good foam retention even in car washing operations. In addition, since the foam is good and the drying can be performed quickly, the deterioration of the scrubber itself can be suppressed as compared with the conventional product, and it can be used for a long period of time.
On the other hand, with respect to Comparative Examples 1 to 5, since Comparative Example 1 does not have a cross-shaped slit S in the middle layer, the penetration of the detergent or the like from the upper layer 1 to the middle layer 2 is not performed efficiently, and the foaming workability is poor. The foaming with only 1 was conspicuous and the foam lacked fineness. Further, even during washing with water, the penetration of water from the upper layer 1 to the middle layer 2 could not be performed efficiently, so that the bubble breakage decreased.
Since the comparative example 2 did not have the uneven | corrugated shape P in the upper layer 1, the bubble storage by a recessed part could not be performed but the foam retention at the time of a cleaning operation was bad. Therefore, repeated foaming work was required during the cleaning work.
In Comparative Example 3, since the polyurethane foam of the middle layer 2 that was not subjected to film-free treatment was used, the penetration of the cleaning agent and the like from the upper layer 1 to the middle layer 2 was greatly reduced. As a result, foaming only in the upper layer 1 was conspicuous, and the foam lacked fineness. In addition, it became difficult for water to permeate even during washing, deterioration of foam in the middle layer 2 deteriorated, and a long time was required for drying.
Since Comparative Example 4 used a foam that was not subjected to film-free treatment on the upper layer 1, it was difficult for the cleaning liquid or the like to penetrate even into the upper layer 1, foaming workability was poor, and at the same time, the generation of fine bubbles was inhibited. Generation | occurrence | production was concentrated on the part which added the washing | cleaning liquid, and it was difficult to foam on the whole washing | cleaning surface. In addition, after the cleaning agent or the like has started to penetrate into the middle layer 2, the bubble leakage from the non-cleaning surface side such as the side surface of the scrubbing surface becomes more remarkable than the cleaning surface having the uneven shape P in the upper layer 1, and the cleaning workability is also poor. Also declined. In addition, since it is difficult for water to permeate even during washing, foam breakage is poor and drying also takes a long time.
In Comparative Example 5, a foam having a density equivalent to that of the middle layer 2 was used for the upper layer 1, so that the foam generated in the middle layer leaked from the side of the scrubber in addition to the upper layer 1, and the foam retention decreased.

The sponge scrub for washing automobiles according to the present invention can easily generate fine bubbles with a very fine particle size, and can retain the bubbles for a long time during a cleaning operation. There is little leakage of bubbles to the non-cleaning side such as the backside.
As described above, according to the scrubbing brush of the present invention, the surface of the automobile is washed with fine ultrafine bubbles, and can be smoothly washed by an easy operation without damaging the surface.
In addition, since the scrubbing brush of the present invention is excellent in water permeability and air permeability, it can be easily washed with water after use and has a high drying speed. For this reason, it is difficult to cause deterioration of the scrubbing and the above effect can be maintained for a long period of time.
Therefore, according to the scrubber of the present invention, it is easy not only for a general passenger car but also for a high-class automobile, a taxi that cannot make dirt noticeable and requires frequent washing, a work vehicle with strong dirt, etc. The scrubbing brush of the present invention, which can remove dirt smoothly with a simple operation and has excellent durability, can achieve its purpose extremely effectively.

DESCRIPTION OF SYMBOLS 10 Automobile cleaning sponge scrubber body 1 Upper layer 2 Middle layer 3 Lower layer 11 Convex part 12 Concave part 21 Upper surface 22 in contact with the upper layer in the middle layer P Lower surface in contact with the lower layer in the middle layer P Convex shape by profile processing or two-dimensional processing H1 Convex height in the upper layer Height H2 Concave height in upper layer D Spacing between convex parts S Cross-shaped slit

Claims (7)

The foam is laminated in a three-layer structure of the upper layer, middle layer, and lower layer.
The surface on the side opposite to the contact surface with the middle layer in the upper layer is subjected to uneven processing,
The upper layer and the middle layer are made of polyurethane foam subjected to film-free treatment, the upper layer has a density of 10 to ³⁰ kg / m ³ , the middle layer has a density of 20 to 50 kg / m ³ , and the density of the middle layer is at least 5% of that of the upper layer high,
A sponge scrubber for washing automobiles, wherein the middle layer is provided with a plurality of cross-shaped slits or holes from the surface in contact with the upper layer to the back surface in contact with the lower layer.   2. The sponge scrub for washing automobiles according to claim 1, wherein the lower layer foam is made of polyurethane foam or polyethylene foam.   The sponge scrubber for washing automobiles according to claim 1 or 2, wherein the depth of the cross-shaped slit or hole has at least 30% of the thickness of the middle layer. The length of each side of the cross-shaped slit is 0.5 to 20 mm, or the diameter of the hole is 0.5 to 15 mm,
The cross-shaped slits or holes are arranged in an aligned state along the vertical, horizontal, or diagonal lines as viewed from the middle layer surface side in contact with the upper layer, or each row in the aligned state is provided in a staggered manner. The sponge scrubber for car washing given in any 1 paragraph of Claims 1-3.   The sponge scrubber for car washing according to any one of claims 1 to 4, wherein the interval which provides each cross-like slit or hole is the same size.   Each layer thickness in the upper layer, middle layer, and lower layer is 25 to 40% of the upper layer, 45 to 60% of the middle layer, and 15 to 30% of the lower layer with respect to the total thickness of all layers. 6. A sponge scrub for washing automobiles according to any one of 5 above. The height of the convex part in the uneven shape of the upper layer is the upper layer total thickness, the height of the concave part is 20 to 60% of the upper layer total thickness,
The interval between each convex part is the same dimension,
7. The uneven shape is provided in an aligned state along the vertical / horizontal or diagonal lines as viewed from the upper layer surface side, or each row in the aligned state is provided in a staggered manner. 2. A sponge scrub for washing automobiles according to item 1.