DE202012001535U1 - Sponge comprising a layer of vegetable sponge tissue - Google Patents

Abstract

Sponge (10) comprising at least one layer of vegetable sponge fabric (12) attached to a layer of hydrophilic synthetic foam (14).

Description

The present invention relates to a sponge, in particular a scouring pad, which comprises a layer of vegetable spongy tissue.

In particular scouring sponges are known, which have a sponge section for receiving liquids and an abrasive section for scouring.

The sponge section for holding liquids consists either of synthetic sponge material or of vegetable sponge material.

The vegetable (or cellulose-based) sponge is made by regenerating cellulose fibers. These cellulose fibers are absorbent and hydrophilic. In this way, the cellulose fibers help the sponge section to better absorb liquids. This type of sponge is still very good for wiping. However, this type of sponge is relatively expensive to produce.

In addition, the vegetable sponge shows some weakness in terms of wear resistance. The manner in which this sponge is made, in fact, tends to compromise the strength of the cellulosic fibers that compose it. In addition, the vegetable sponge has little tensile elasticity, and is therefore sensitive in terms of tear strength.

The conventional synthetic sponge (or foam), in particular a polyurethane foam having a density in the range of 20 to 30 kg / m ³ , generally has a poor absorption capacity. However, there are synthetic foams that are hydrophilic, that is, capable of capillary fluid wicking, such that a liquid spontaneously penetrates the foam when it comes in contact with the foam.

This capillary capability can be achieved by means of a high density foam, typically on the order of 80 kg / m ³ . Since the manufacturing cost of a synthetic foam is substantially proportional to its density, this solution is expensive.

According to another solution, a hydrophilic foam is produced by a special formulation and a special chemical process.

Synthetic sponges are, in fact, polyurethane foams obtained by chemically reacting reactant, primarily an isocyanate and a polyol. The chemical nature of the polyurethane foams is determined primarily by which polyol is used. Thus, conventional polyurethane foams which are hydrophobic are often based on hydrophobic polyols, such as propylene-based polyols. On the other hand, when hydrophilic polyols such as polyethylene glycol are used, a hydrophilic polyurethane can be obtained. The Aufwischleistungen the hydrophilic synthetic foams with low density (20 to 30 kg / m ³ ), however, remain significantly lower than the Aufwischleistungen the vegetable sponge.

The object of the present invention is to provide a sponge which does not suffer from the various disadvantages mentioned above.

In particular, the invention has the object to provide a wear-resistant sponge, which shows a high liquid absorption capacity and good Aufwischleistungen, and preferably a good abrasive power, that is, it has a good scouring ability.

For this purpose, the present invention provides a sponge comprising at least one layer of vegetable sponge attached to a layer of hydrophilic synthetic foam.

• – Die Schicht aus pflanzlichem Schwammgewebe weist eine feine Zellstruktur auf;
• – die Schicht aus pflanzlichem Schwammgewebe weist Poren mit einem Durchmesser von weniger als 1 mm auf;
• – die Schicht aus pflanzlichem Schwammgewebe weist ein Volumengewicht von mehr als 40 kg/m³ auf;
• – eine abrasive Oberfläche bedeckt mindestens teilweise eine Seite der Schicht aus synthetischem Schaumstoff;
• – die abrasive Oberfläche wird mittels eines Vlieses hergestellt, das mit einem duroplastischen Stoff durchtränkt wird und vorzugsweise abrasive Füllstoffe beinhaltet;
• – Die Dicke der Schicht aus pflanzlichem Schwammgewebe liegt im Bereich von 3 bis 12 mm, vorzugsweise von 4 bis 6 mm;
• – die Schicht aus synthetischem Schaumstoff weist eine Aufnahmeleistung durch Kapillarwirkung von mindestens 0,10 g/cm², vorzugsweise von mindestens 0,50 g/cm² auf;
• - die Dicke der Schicht aus hydrophilem synthetischen Schaumstoff liegt im Bereich von 10 bis 50 mm;
• – die Schicht aus pflanzlichem Schwammgewebe erstreckt sich hauptsächlich gemäß einer Ebene, wobei die Schicht aus pflanzlichem Schwammgewebe reliefartige Aushöhlungen und Vorsprünge gegenüber der Erstreckungsebene aufweist, die sich von den Poren der Schicht aus pflanzlichem Schwammgewebe unterscheiden;
• – der Schwamm umfasst ein Verstärkungsgitter, aus synthetischem oder pflanzlichem Stoff, das in die Dicke der Schicht aus pflanzlichem Schwammgewebe eingearbeitet ist;
• – die Schicht aus hydrophilem synthetischen Schaumstoff weist geschlossene Poren auf, die vorzugsweise kleiner als 0,7 mm sind;
• – die Schicht aus hydrophilem synthetischen Schaumstoff weist offene Poren auf, die vorzugsweise größer als 1 mm sind;
• – die Schicht aus hydrophilem synthetischen Schaumstoff weist eine Dichte von mindestens 25 kg/m³ auf;
• – die Schicht aus hydrophilem synthetischen Schaumstoff weist eine Zugfestigkeit von mindestens 120 kPa auf;
• – die Schicht aus hydrophilem synthetischen Schaumstoff weist eine Elastizität von mindestens 200% auf;
• – die Schicht aus pflanzlichem Schwammgewebe und die Schicht aus hydrophilem synthetischen Schaumstoff sind mittels eines Klebstoffs mit einer Viskosität von mehr als 10.000 mPa·s bei 25°C aneinander befestigt, wobei dieser Klebstoff mit höchstens 200 g/m², vorzugsweise mit höchstens 150 g/m² gekleistert wird;
• – die Schicht aus hydrophilem synthetischen Schaumstoff weist mindestens eine Verstärkung auf, die dazu geeignet ist, das Ergreifen des Schwamms zu erleichtern;

According to preferred embodiments, the sponge according to the invention has one or more of the following characteristics, individually or in combination:

• - The layer of vegetable sponge tissue has a fine cell structure;
• - the layer of vegetable sponge tissue has pores with a diameter of less than 1 mm;
• The layer of vegetable spongy tissue has a volume weight of more than 40 kg / m ³ ;
• An abrasive surface at least partially covers one side of the synthetic foam layer;
• - The abrasive surface is made by means of a nonwoven, which is impregnated with a thermosetting material and preferably includes abrasive fillers;
• - The thickness of the layer of vegetable sponge fabric is in the range of 3 to 12 mm, preferably from 4 to 6 mm;
• The layer of synthetic foam has a capillary action of at least 0.10 g / cm ² , preferably at least 0.50 g / cm ² ;
• the thickness of the layer of hydrophilic synthetic foam is in the range of 10 to 50 mm;
• The layer of spongy vegetable tissue extends mainly along a plane, the layer of spongy vegetable tissue having relief-like cavities and protrusions opposite the plane of extent, which are different from the pores of the layer of spongy vegetable tissue;
• - The sponge comprises a reinforcing grid, made of synthetic or vegetable material, which is incorporated in the thickness of the layer of vegetable sponge fabric;
• The layer of hydrophilic synthetic foam has closed pores, which are preferably smaller than 0.7 mm;
• The layer of hydrophilic synthetic foam has open pores, which are preferably larger than 1 mm;
• The layer of hydrophilic synthetic foam has a density of at least 25 kg / m ³ ;
• The layer of hydrophilic synthetic foam has a tensile strength of at least 120 kPa;
• The layer of hydrophilic synthetic foam has an elasticity of at least 200%;
• - The layer of vegetable sponge fabric and the layer of hydrophilic synthetic foam are attached by means of an adhesive having a viscosity of more than 10,000 mPa · s at 25 ° C to each other, said adhesive having at most 200 g / m ² , preferably at most 150 g / m ^{2 is} pasted;
• The layer of hydrophilic synthetic foam has at least one reinforcement suitable for facilitating the gripping of the sponge;

Further features and advantages of the invention will become apparent from the following description of preferred embodiments of the invention, given by way of example and with reference to the accompanying figures.

The 1 schematically shows an example of a sponge.

The 2 shows a cross section of the sponge of 1 ,

The sponge 10 as he is in the 1 and 2 is shown has three layers 12 . 14 . 16 arranged on top of each other and in pairs by adhesive layers 18 . 20 are glued. This sponge 10 has, for example, a thickness in the range of 20 to 50 mm, a length in the range of 9 to 15 mm and a width in the range of 5 to 10 mm. The sponge 10 has in the present case a shape that is substantially cuboid. However, other forms are conceivable. In particular, the sponge 10 have one or two sides forming wave profiles so that the user can grasp the sponge more easily. Other non-linear shapes that are more original and offer the consumer a more attractive appearance are also conceivable. In any case, the molds are made in a known manner by adding one or more of the layers 12 . 14 . 16 which the sponge 10 form, be excavated or cut accordingly.

At the first shift 12 it is a layer of vegetable or cellulosic sponge tissue. This type of sponge fabric is high in capillary performance and wiping performance.

The layer of vegetable sponge tissue 12 preferably has a thickness in the range of 3 to 12 mm, which is preferably less than 10 mm and even more preferably in the range of 4 to 6 mm. In fact, the layer of vegetable sponge tissue must be sufficiently strong to allow wiping and picking up liquids. The thickness of this layer of vegetable sponge tissue 12 However, it must be limited to premature wear of the layer of vegetable sponge 12 to prevent. The layer of vegetable sponge material may have a density in the range of 40 to 80 kg / m ³ , this preferably being substantially equal to 50 kg / m ³ .

To prevent premature wear of the layer of vegetable sponge tissue, this can be reinforced, for example by means of a reinforcing grid. This reinforcing grid can be made of synthetic material or of vegetable material. The reinforcing grid may in particular comprise cellulose fibers. The reinforcing grid is preferably incorporated in the thickness of the layer of vegetable sponge fabric.

• – pflanzlicher Schwammstoff mit unregelmäßiger Porigkeit, der Poren enthält, welche mehrere Millimeter messen können, und
• – pflanzlicher Schwammstoff mit feiner Porigkeit, dessen Poren einen Durchmesser von weniger als 1 mm haben, wobei er üblicherweise in Form von Wischgeweben oder Schwammgeweben vorliegt.

The layer of vegetable sponge tissue has a fine cell structure, that is, it has pores with a diameter of less than 1 mm, so as to ensure that the layer of vegetable sponge tissue has a good suction power by capillary action. There are, in fact, two types of vegetable sponges:

• - Vegetable sponge with irregular porosity, containing pores that can measure several millimeters, and
• - A fine-porosity herbal sponge whose pores are less than 1 mm in diameter, usually in the form of wipes or sponges.

A fine porosity proves to be doubly advantageous in terms of uptake and wiping: on the one hand, the fine porosity sponge contains more cellulose (which forms the receiving fibers) and fewer holes. On the other hand, the sponge material with fine porosity, thanks to its fine porosity, a better capillary action. Furthermore, the fine cell structure corresponds to a higher Aufwischleistung, because the absorbed water escapes less easily from the holes and leaves less marks on the wiped surface.

In addition, the irregularly porous vegetable sponge has volume weight values (dry weight by volume in the wet state) of the order of 30 kg / m ³ , while the fine-porosity vegetable sponge is about twice as dense. Such a density is suitable for products of the vegetable wipe type (thickness of the order of 5 mm), but less so for sponges of greater thickness (of the order of 20 mm or more), because the softness is insufficient due to the high density, as well for cost reasons.

The layer of vegetable sponge tissue may extend mainly in one plane. In this case, the layer of vegetable spongy tissue has relief-like cavities and protrusions opposite to the plane of extension, which differ from the pores of the layer of vegetable sponge tissue. In particular, these relief-like elements may make it possible to increase the cleaning power of the sponge. The relief-like elements can be obtained as follows: The first step in the preparation of the cellulosic sponge is to convert the cellulose to viscose. This is followed by the addition of salt grains, pigments and possibly reinforcing fibers. The mushy mass obtained in this way is then applied in layers to a band with a relief structure, after which it is coagulated, for example, by the action of heat (steam). The cellulose fibers are regenerated, the molten salt grains leave cavities which determine the porosity of the sponge, and the conveyor belt imparts to the surface of the sponge its relief structure.

At the second layer 14 it is a layer of hydrophilic synthetic sponge (or foam), in particular a layer of hydrophilic polyurethane foam.

Hydrophilic synthetic polyurethane foams and methods for producing such foams are known in the art and are particularly in US-B-4,051,081 . US-B-3,873,476 . GB-A-1 429 711 and US-B-6,271,277 described.

• – mindestens 0,10 g/cm² beträgt und streng kleiner als 0,50 g/cm² ist, oder
• – mindestens 0,50 g/cm² beträgt.

By "hydrophilic" sponge or foam as used herein and in the claims is meant a sponge or foam in which a layer having a thickness of 20 mm has a wicking capacity greater than 0.10 g / cm ² , preferably greater than 0.50 g / cm ² . In other words, a hydrophilic sponge or foam is a sponge or foam in which a layer having a thickness of 20 mm has a capillary action receiving power

• Is at least 0.10 g / cm ² and is strictly less than 0.50 g / cm ² , or
• - At least 0.50 g / cm ² .

• • Ein Prüfstück des Werkstoffs mit gegebener Dicke wird 3 min. lang in Leitungswasser eingetaucht;
• • Anschließend wird es abgespült und außerhalb des Wasser dreimal von Hand ausgepresst;
• • Das Prüfstück wird daraufhin 3 min. lang geschleudert;
• • Dann wird das Gewicht P₁ des Prüfstücks gewogen;
• • Die Oberfläche S des Prüfstücks wird in liegendem Zustand bestimmt;
• • Das Prüfstück wird 15 s lang in eine 6 mm tiefe Schale gelegt, die von einer dünnen Wasserschicht durchströmt wird;
• • Das Prüfstück wird aus der Schale entnommen, woraufhin sein Gewicht P₂ bestimmt wird;
• • Für eine bestimmte Dicke e des Prüfstücks wird die kapillare Aufnahmeleistung τ_abs gemäß der folgenden Gleichung bestimmt:
  

Capillary power measurement is carried out according to the following method of preparation:

• • A test piece of the material with a given thickness is 3 min. long immersed in tap water;
• • Then it is rinsed and squeezed out of the water three times by hand;
• • The test piece is then left for 3 min. flung long;
• • Then the weight P _{1 of} the test piece is weighed;
• • The surface S of the test piece is determined in a lying condition;
• • The test piece is placed in a 6 mm deep dish for 15 s, through which a thin layer of water flows;
• • The test piece is removed from the tray, whereupon its weight P _{2 is} determined;
• • For a given thickness e of the test piece, the capillary input power τ _{abs is determined} according to the following equation:
  

The layer of hydrophilic synthetic foam may have a tensile strength which, in a measurement according to the Standard ISO 1798 , fourth edition (corresponding to the Standard ISO 1798: 2008 ) is substantially equal to 150 kPa or even higher. In this way, the layer of vegetable sponge material can be reinforced to limit its wear.

The layer of hydrophilic synthetic foam 14 preferably has a thickness in the range of 10 to 50 mm.

The layer of hydrophilic synthetic foam may be of increased density, preferably greater than 25 kg / m ³ . Indeed, a lesser density foam appeared quite light compared to the layer of vegetable spongy tissue to which it is attached. The density is calculated according to the Standard ISO 845 , third edition (corresponding to the Standard ISO 845: 2006 ), measured.

Further, the layer of hydrophilic synthetic foam has an elasticity value, that is, a tensile elongation value, of 200% or more. The elongation at break is also according to the Standard ISO 1798 , fourth edition (corresponding to the Standard ISO 1798: 2008 ).

For better handling, the layer of hydrophilic synthetic foam may have one or more lateral reinforcements or side cavities 22a . 22b which are suitable for facilitating the gripping of the sponge by the user. For this purpose, the reinforcements or cavities recessed in the layer of hydrophilic synthetic foam have a length of at least 2 cm, a height of at least 5 mm and a depth of at least 5 mm. The cavities can be produced for example by grinding.

The third layer 16 forms an abrasive surface. In the present case, this third layer 16 produced by means of a nonwoven, which is impregnated with a thermosetting material and preferably includes abrasive fillers. These abrasive fillers may be, for example, coarse iron powder, quartz, corundum, recycled glass, talc particles or fine granules of plastic.

In the present case, the adhesive may be in adhesive layers 18 and 20 between the layer of hydrophilic synthetic foam 14 , the layer of vegetable sponge tissue 12 or the layer 16 , which forms the abrasive surface, is used to act as a viscous polyurethane adhesive having a viscosity of greater than 10,000 mPa · s at 25 ° C. The viscosity is determined according to Standard ASTM D 4889 from 2004 (corresponding to the Standard ASTM D 4889-04 , published in April 2004). Such an adhesive causes the various layers to be firmly bonded together after polymerization.

• – der Klebstoff eher mit Hilfe einer Rolle als durch Besprühen aufgebracht wird, und/oder indem
• – ein ausreichend viskoser Klebstoff verwendet wird, insbesondere mit einer Viskosität von mehr als 10.000 mPa·s bei 25°C, wie oben erwähnt, und indem die aufgebrachte Menge beispielsweise auf 150 g/m² beschränkt wird.

It should be noted that this type of adhesive is water impermeable. As a result, it should be ensured that it only partially covers the two surfaces of the vegetable sponge layer and the hydrophilic synthetic sponge layer so that the water can pass from one of the two layers to the other, and vice versa. Since the layers of vegetable sponge and hydrophilic synthetic sponge have a cellular structure, the desired result can be achieved by:

• The adhesive is applied by means of a roller rather than by spraying, and / or by
• - A sufficiently viscous adhesive is used, in particular having a viscosity of more than 10,000 mPa · s at 25 ° C, as mentioned above, and by the amount applied, for example, limited to 150 g / m ² .

In this way, the adhesive settles mainly on the protruding portions of the surface without penetrating the depth or completely covering the cells. The presence of large cells, in particular larger than 1 mm, in the hydrophilic synthetic sponge layer makes it possible to achieve this effect.

As a variant, the layers are firmly joined by one of the glued layers is superficially brought to melt by the action of heat.

In the sponge 10 As described above, the lower layer of vegetable sponge fabric allows wiping wet surfaces with which it is in contact effectively. In addition, by employing a hydrophilic synthetic fabric which is in contact with the layer of vegetable sponge fabric, the capillary force of the layer of vegetable sponge fabric finds its connection in the intermediate layer which serves as storage space. In other words, the liquid initially taken up by the layer of vegetable sponge fabric is released into the intermediate layer of synthetic sponge which stores this liquid. The layer of vegetable sponge tissue is less saturated quickly, and therefore it is possible to wipe the sponge for a long time without wringing it out.

To enhance the "memory" effect of the hydrophilic synthetic foam, it may have a closed pore (or cell) structure. In particular, such a closed-cell hydrophilic synthetic foam can retain the detergent foam better and longer than a vegetable sponge whose fibrous structure does not permit long retention of the detergent. In this way, the washing power of the sponge and the cleaning agent consumption are optimized.

• i) Poren oder Zellen von geringer Größe, das heißt, in der Größenordnung von einigen Zehntel Millimetern und vorzugsweise von weniger als 0,7 mm, die im Allgemeinen geschlossen sind. Diese kleinen Zellen begünstigen die Aufnahme durch Kapillarwirkung.
• ii) größere Poren oder Zellen, das heißt, in der Größenordnung von einigen Millimeter und vorzugsweise im Bereich von ein bis fünf Millimeter, die im Allgemeinen offen sind. Diese größeren Zellen ermöglichen es, den Austausch von Flüssigkeit zwischen der Schicht aus pflanzlichem Schwammgewebe und der Schicht aus synthetischem Schaumstoff zu erleichtern, und zwar über die Klebstoffschicht, welche diese nicht vollständig bedeckt.

In the present case, the sponge points 2 However, a layer of hydrophilic synthetic foam with irregular porosity on. In other words, the synthetic foam has the following:

• i) pores or cells of small size, that is, of the order of a few tenths of a millimeter, and preferably less than 0.7 mm, which are generally closed. These small cells favor uptake by capillary action.
• ii) larger pores or cells, that is, on the order of a few millimeters, and preferably in the range of one to five millimeters, which are generally open. These larger cells make it possible to facilitate the exchange of fluid between the layer of vegetable sponge fabric and the layer of synthetic foam, via the adhesive layer, which does not completely cover them.

In addition, the layer of vegetable sponge fabric is soft when wet. When dried, it shrinks and becomes hard. The layer forming the abrasive surface adhered to the layer of synthetic sponge, in turn, has a low extensibility. The synthetic foam is a very elastic material. This foam takes on the role of a mechanical buffer between the layer of vegetable sponge fabric and the layer which forms the abrasive surface, namely, these are less elastic. In this way it is avoided that a series of tensions and relaxations occurs in the area of the adhesive bonding surface of the layer of vegetable sponge fabric and the layer forming the abrasive surface, this sequence of tensions and relaxations in the sponges of the prior art The technique causes the different layers to separate from each other.

Of course, the present invention is not limited to the examples and the embodiment which are described and illustrated, but may have numerous variants that are available to those skilled in the art.

In particular, the third layer, as a variant, can be replaced by a second layer of vegetable or cellulose-containing sponge fabric or even by a layer of vegetable or cellulosic sponge material. The sponge formed in this way has a large suction power on the two opposite sides, as well as a wear resistance which is better than in a conventional cellulosic sponge, as there is a hydrophilic interlayer between the two layers of spongy vegetable tissue or between the layer of vegetable spongy tissue and the layer of vegetable sponge.

As a variant, the sponge can have no third layer. In this case, it is possible to form an abrasive surface by directly printing the second layer of spongy fabric by means of a printing ink comprising a thermosetting compound-based binder and, preferably, abrasive fillers as described above.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 4051081 B [0026]
• US 3873476 B [0026]
• GB 1429711A [0026]
• US 6271277 B [0026]

Cited non-patent literature

• Standard ISO 1798 [0029]
• Standard ISO 1798: 2008 [0029]
• Standard ISO 845 [0031]
• Standard ISO 845: 2006 [0031]
• Standard ISO 1798 [0032]
• Standard ISO 1798: 2008 [0032]
• Standard ASTM D 4889 [0035]
• Standard ASTM D 4889-04 [0035]

Claims (18)

Sponge ( 10 ) containing at least one layer of vegetable spongy tissue ( 12 ) which is attached to a layer of hydrophilic synthetic foam ( 14 ) is attached. Sponge according to claim 1, wherein the layer of vegetable spongy tissue ( 12 ) has a fine cell structure. Sponge according to claim 1 or 2, wherein the layer of vegetable sponge tissue has pores with a diameter of less than 1 mm. Sponge according to claim 1 to 3, wherein the layer of vegetable sponge tissue has a volume weight of more than 40 kg / m ³ . Sponge according to one of the preceding claims, wherein one side of the layer of synthetic foam ( 14 ) at least partially from an abrasive surface ( 16 ) is covered. Sponge according to claim 5, wherein the abrasive surface ( 16 ) is made by means of a nonwoven, which is impregnated with a thermosetting material and preferably includes abrasive fillers. Sponge according to any one of the preceding claims, wherein the thickness of the layer of vegetable spongy tissue ( 12 ) is in the range of 3 to 12 mm, preferably 4 to 6 mm. Sponge according to any one of the preceding claims, wherein the layer of synthetic foam ( 14 ) has a capillary action of at least 0.10 g / cm ² , preferably at least 0.50 g / cm ² . Sponge according to any one of the preceding claims, wherein the thickness of the layer of synthetic foam ( 14 ) is in the range of 10 to 50 mm. Sponge according to any one of the preceding claims, wherein the layer of spongy vegetable tissue stretches mainly in a plane, the layer of vegetable spongy tissue having relief-like cavities and protrusions opposite to the plane of extension, which are different from the pores of the layer of vegetable spongy tissue. Sponge according to any one of the preceding claims, comprising a synthetic or vegetable reinforcing grid incorporated in the thickness of the layer of vegetable sponge fabric. Sponge according to any one of the preceding claims, wherein the layer of hydrophilic synthetic foam ( 14 ) has closed pores, which are preferably smaller than 0.7 mm. Sponge according to any one of the preceding claims, wherein the layer of hydrophilic synthetic foam ( 14 ) has open pores, which are preferably greater than 1 mm. Sponge according to any one of the preceding claims, wherein the layer of hydrophilic synthetic foam ( 14 ) has a density of at least 25 kg / m ³ . Sponge according to any one of the preceding claims, wherein the layer of hydrophilic synthetic foam ( 14 ) has a tensile strength of at least 120 kPa. Sponge according to any one of the preceding claims, wherein the layer of hydrophilic synthetic foam ( 14 ) has an elasticity of at least 200%. Sponge according to any one of the claims, wherein the layer of vegetable spongy tissue ( 12 ) and the layer of hydrophilic synthetic foam ( 14 ) by means of an adhesive ( 18 ) having a viscosity of more than 10,000 mPa · s at 25 ° C are attached to each other, said adhesive with at most 200 g / m ² , preferably at most 150 g / m ² , is gelatinized. Sponge according to any one of the preceding claims, wherein the layer of hydrophilic synthetic foam ( 14 ) at least one reinforcement ( 22a . 22b ), which is adapted to facilitate the gripping of the sponge.

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