KR20090038017A - Process for application of a covering to a table-tennis bat, and table-tennis bat - Google Patents

Abstract

The invention relates to a process for application of a covering (4) to a blade (3) of a table-tennis bat. According to the invention, the covering (4) is applied with use of a latex material. In particular, there can therefore be a layer (7) composed of natural latex. It is advantageous in this process that on replacement of the covering (4) the old covering (4) can be peeled away without thereby damaging the blade (3) or the covering (4). Furthermore and in particular, it is possible to provide an adhesive bond without solvents for the bond between the covering (4) and the blade (3).

Description

Process for application of a covering to a table-tennis bat, and table-tennis bat}

The present invention relates to a method of attaching a cover to a plate of a table tennis racket and a table tennis racket.

2 shows a top view of a standard ping pong racket 1 according to the prior art; 3 shows a corresponding side view. The ping pong racket 1 has a respective cover 4 which is attached to a part of the ping pong racket 1 which is mainly abbreviated as "racket wood" or "tree" on two sides for hitting a ping pong ball. An additional component of the ping pong racket is the handle 2. The part of the table tennis racket to which the cover 4 is attached is abbreviated as "racket plate" or "plate".

The board 3 consists mainly of at least wood. In the rules of the International Table Tennis Association (ITTF), a rule found in Rule "2.4 Racket" is that at least 85% of the plates 3 must be made of natural wood, as measured by their thickness. The adhesive layer in the racket plate may be reinforced with fibrous material. However, the adhesive layer cannot occupy more than 7.5% or more than 0.35 mm of the total thickness on the smaller basis.

As shown in FIG. 1, the cover 4 may consist of a so-called “sandwich rubber”, ie an outer layer of the protruding rubber 5 and a layer of the underlying porous rubber 6. Table tennis players often call the outer layer "top rubber" and the bottom layer "sponge" or "sponge base". The protrusion rubber 5 may be provided with protrusions both externally and internally. The protruding rubber 5 is mainly a non-porous, natural or synthetic rubber material. Therefore, no sponge or porous rubber is used as the protruding rubber. On the other hand, the porous rubber 6 is mainly sponge rubber or foam rubber. Optionally, the cover 4 may generally consist of a layer of protruding rubber 5 with the protuberance externally.

In accordance with the above rules, the material of the cover 4 must completely cover the plate 3 but not protrude beyond the edges (Rule 2.4.4).

The lid 4 is mainly connected to the plate 3 by an adhesive layer 7. In accordance with the above rules, one adhesive layer 7 must be continuous and uniform in thickness (rule 2.4.5).

The life of the cover is usually shorter than that of the plate or racket. The cover should "wear out" and be replaced after a certain time. Today, it is no longer common to buy ping pong rackets that can be easily assembled by a table tennis player, ie including a covered cover, and players will usually buy rackets with covers and plates as individual parts and attach them themselves. The industry responded to this reaction and provided special adhesives for attaching the cover to the plate. These special adhesives are often called "new adhesives."

To attach two covers to the racket's plate, the table tennis player must: Apply a special glue (new glue) on the plate and the two covers with a paint brush. Subsequently, a predetermined time is waited for the adhesive to dry to a predetermined degree. Subsequently, attach the cover to the plate. According to another method, the cover is brushed twice or several times before joining the surfaces to be joined together.

In general, what is gained by this method is that the characteristics of the cover change to be "harder" for the ping pong racket to play.

A problem associated with this is the fact that ordinary special adhesives include solvents in the form of benzene or trichloroethylene, for example. The evaporation of the solvents in the new adhesive can cause indolence and bruising, commonly known as detrimental effects on health. ITTC no longer allowed any table tennis rackets with solvent-containing adhesives on September 1, 2008. In particular, solvent related damage to the health of table tennis players, especially children and young people, should be avoided in this way.

Today, many table tennis players put a cover on their racket just before the game. This mainly occurs at the corresponding sports arena. In this case, in particular, the first stage of evaporation in which large amounts of solvent fly into the surrounding atmosphere takes place substantially during the corresponding race period. The above problem is particularly important in this respect.

In addition to the toxic effects of solvent vapors, solvent vapors are generally considered to be flammable and not only harmful, but dangerous.

As another disadvantage, it is believed that the solvents of the new adhesives can attack the sheath. This is especially important when the cover is used several times. In the case of a "sandwich rubber," a solvent penetrates into the porous-rubber layer to attack and at least partially dissolve the cell walls. In addition, the solvent generally extends to and affects the protruding rubber layer. Repeated soaking of the cover in a solvent makes the cover brittle and especially "fastens up" quickly, increasing the risk of breakage of the bump and porous rubbers. In the case of sandwich rubber, the solvent weakens the bond between the protruding rubber layer and the foam rubber layer, resulting in a loosening of the bond and the risk of bubbles being formed.

In addition, repeated use of the cover on the surface for bonding leads to an undesirable direction in which the adhesive layer accumulates thicker and repeats, increasing the weight of the ping pong racket.

In addition, solvents may attack the surface of the plate. For example, it may cause exhaustion of the surface end plate of the plate. To prevent this, special treatment of the plate surface is required, for example with wood-sealing wax. However, such wood-sealing waxes can adversely affect the strength of bonding by the adhesive applied later.

In connection with these problems, other adhesives are available from the industry that remove solvents. In the meantime, the solvent removal adhesives already provided on the market have excellent properties in terms of the tightness of the bonding between the plate and the cover, but there are still disadvantages of damaging the plate and the cover because the cover cannot be easily removed from the plate when exchanged. exist. When the cover is removed, it must be removed in a very sophisticated way because the cover is torn or residues are left on the plates. There is also a risk that the wooden surface of the board may be damaged when the cover is peeled off.

Moreover, it should be considered that these solvent-free adhesives do not have any solvents, but have other chemical components, and as a result there is a risk that these chemical components may adversely affect the health of the table tennis player.

It is a primary object of the present invention to specify a method of attaching a cover to a plate of a ping pong racket which avoids the above problems and to specify a corresponding ping pong racket. In particular, it will be possible to attach the cover to the plate without the aid of a solvent-containing adhesive, in which case it is possible to replace the cover while reducing the risk of damage to the racket during the exchange.

This object is achieved by the subject of the independent claims. Advantageous developments are specified in the dependent claims.

According to a first aspect of the invention, a method of attaching a cover to a plate of a ping pong racket is provided. In this regard, the pasting is performed according to the invention using a latex material.

As a result, the first advantage is that in order to replace the cover, the cover to be replaced (and glued with latex material) can be easily removed from the plate without damaging the plate. When the latex layer located between the cover and the plate is removed, it is usually only on the plate or on the cover, depending on the shape of the cover. If a layer of latex material is present on the plate, it can be removed from the plate surface easily and without damaging the plate surface. If a layer of latex material remains on the cover, it is no longer necessary to clean the wooden surface of the plate. The wooden surface of the board is completely clean and undamaged and it is easy to attach a (new) cover on it.

The latex material is advantageously used for bonding by the adhesive between the cover and the plate.

Advantageously, the latex material is a natural latex, for example natural rubber or rosin or other plant resins. The latex material may, for example, be entirely natural latex, ie natural latex without additional additives or additional components.

The latex material can be part of an adhesive composition. Thus, a "natural latex adhesive" comprising an aqueous suspension such as rosin, natural latex and additional ingredients such as (milk) casein, cellulose or isoparaffin can be used to bond the cover to the plate.

The surface of the cover for adhering to the plate may have foam rubber and / or protrusion rubber.

Advantageously, the method has the following steps: applying a portion of the latex material onto the surface of the plate; Applying another part of the latex material onto the surface of the cover.

In addition, the step of drying the latex material applied on the surface of the plate and / or on the surface of the lid may be provided.

In addition, the step of joining together the surface of the cover and the surface of the plate may be provided. This step can in particular be provided immediately, ie without further intermediate steps after the drying step.

Coating can be accomplished, for example, by brushing at least partially with a paint brush. In this way, a uniform layer of latex material can be applied in a relatively simple manner.

According to another aspect of the present invention, a table tennis racket having a plate and a cover is provided. Table tennis rackets are characterized in that a layer with a latex material is provided between the cover and the plate.

In this regard, the layer can ensure the bonding by the adhesive between the cover and the plate.

The latex material may be natural latex.

In addition, a table tennis racket is provided wherein the cover is attached to the plate using the method according to the invention.

The invention is described in more detail with reference to the drawings and the help of the following exemplary embodiments.

1 is a cross-sectional view of a lid attached to a plate.

2 is a plan view of a ping pong racket according to the prior art.

3 is a side view of the table tennis racket according to FIG. 2.

The cover 4 can be attached to the plate 3 of the ping pong racket 1 by the method according to the invention.

The following method is provided according to an exemplary embodiment. As a first example, a latex material, ie a natural latex according to an exemplary embodiment, is applied on the surface 9 of the plate 3 of the ping pong racket 1, which is joined with the lid 4 by means of a paint brush. Subsequently, the lid 4 is coated with a latex material, for example with the aid of a paint brush.

The latex material may be a natural material, for example natural latex or other plant resins such as natural rubber or rosin or mixtures or compositions of these materials. In this regard, latex material is used without additional additives. Optionally, latex material is used with additional additives. For example, in addition to the latex material above, a "natural latex adhesive" is used which comprises, for example, casein-for example milk casein form-cellulose, isoparaffin, water and the like.

The natural latex is milky fluid and is well suited for application with a paint brush. In this regard, one can simply attach a layer of at least approximately uniform thickness and sufficiently uniform thickness for a ping pong game.

After applying the latex material, wait for a predetermined time, that is, until the latex material applied to the lid 4 and the plate 3 slightly dries. For example, the latex material is already absorbed on the corresponding surface 8, 9 but waits for it to not dry out yet. Subsequently, the lid 4 and the plate 3 are joined together, in particular without additional intermediate steps or other materials, ie the lid 4 is glued to the plate 3. Thus joining together is performed when the latex material has been absorbed but not yet completely dried. Two layers of latex material bonded together form an adhesive layer 7, whereby the lid 4 is bonded to the plate 3.

Optionally, applying the latex material onto the lid 4 and / or the plate 3 is repeated twice or several times.

In addition, joining together is carried out under the action of pressure, for example by means of a pressure roller. As a result, it is possible to bond together particularly uniformly.

The operation has been described for only one cover 4. In practice, it will take place to replace both covers 4 of the table tennis racket 1. In this case, the method is carried out by applying latex material to the two covers 4 and applying the latex material to both sides of the plate 3 in one operation before joining the two covers 4 together to the plate 3 together. Can be.

To replace the cover 4, the cover can be removed from the plate 3 and replaced with a new or another cover 4.

The lid 4 adhered onto the plate 3 by latex can be removed from the plate 3 in a simple manner without damaging the surface 9 of the plate 3. In this way, the racket wood can be used further without further processing steps.

Both latex layers, i.e. the latex layer adhered to the plate 3 and the latex layer or bonded latex layer 7 attached on the cover 4, have two surfaces (because of the nature of the latex material when removed from the cover 4). At least one of 8, 9, ie on the surface 9 of the plate 3 or on the surface 8 of the lid 4. This is determined according to the shape of the cover 4. If the latex layer 7 remains on the plate 3, this layer can be removed from the plate 3 easily and without damaging the plate 3. If the latex layer 7 remains on the lid 4, cleaning of the surface 9 of the plate 3 is not necessary. The surface 9, ie the surface veneer, may have a new cover 4 that is completely clean, intact and glued back immediately and without further processing steps.

The plate 3 may be a tree or a mainly wooden plate 3, ie a plate 3 with a wooden surface. For example, the cover 4 may have a sandwich structure, ie, a porous rubber 6 and a protrusion rubber 5, in which case the protrusion rubber 5 may represent an outer layer and may have a protrusion inside or outside. The protrusion may be placed. Alternatively, a single layer cover 4 composed of only the protruding rubber 5 is possible.

Latex can be used without natural products and chemical additives.

The advantages of the present invention can be summarized as follows: The use of a solvent-containing adhesive can be avoided when attaching the cover to a table tennis racket with the method according to the invention. In this case, the use of other chemical adhesives can also be avoided. Replacement of the cover is possible by this method without damaging the surface of the board of the racket wood. In particular, the covers do not need to be cleaned individually.

Reference Number List

1 table tennis racket

2 handle

3rd edition

4 cover

5 turning rubber

6 porous rubber

7 adhesive layer

8 Cover surface for pasting

9 plate surface

Included in the context of the present invention

Claims (13)

A method of attaching a cover (4) to a plate (3) of a ping pong racket (1), which is carried out using a latex material. The method of claim 1, The latex material is used for bonding by adhesive between the cover (4) and the plate (3). The method according to claim 1 or 2, The latex material is a natural latex. The method according to any one of claims 1 to 3, The latex material is part of an adhesive composition. The method according to any one of claims 1 to 4, The surface (8) of the cover (4) for attaching with porous rubber (6) and / or protrusion rubber (5). The method according to any one of claims 1 to 5, Applying a portion of the latex material onto the surface of the plate 3, and Applying an additional portion of the latex material onto the surface of the lid (4). The method of claim 5, wherein Drying the latex material applied on the surface (9) of the plate (3) and / or on the surface (8) of the cover (4). The method according to claim 5 or 6, Joining together the surface (8) of the cover (4) and the surface (9) of the plate (3) together. The method according to any one of claims 5 to 7, Applying is done at least in part by brushing. Table tennis racket with plate (3) and cover (4) characterized by a layer (7) with latex material between the cover (4) and the plate (3). The method of claim 10, The layer (7) is a table tennis racket that ensures the bonding by the adhesive between the cover (4) and the plate (3). The method of claim 10 or 11, The latex material is a table tennis racket of natural latex. The method according to any one of claims 10 to 12, The cover (4) is a table tennis racket attached to the plate (3) using the method according to any one of claims 1 to 9.

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