DE1478021A1 - Spielbaelle - Google Patents

Description

8MDNOHEN *.

Oasis No "BS 389 * I

DUNLOP RUBBER COMPANY LIMITED, London N.W, ■ / Great Britain

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Game balls

t * m SS «Ζ SS ίΠ OS SSi 13 ΐΓί ·»

The invention relates to game balls, and in particular to one Balls for lawn tennis, which can be used as tennis balls to be designated »

A cue ball usually consists of a hollow ball made of a resilient medium, usually a mixture of rubber or rubber-like material, which is properly formulated iet to produce favorable properties for a cue ball »

Usually the hollow sphere contains (here iia the following ball envelope called) a gas at a pressure above atmospheric pressure, the excess pressure in the case of a conventional ball usually being in the Large order of 0.70 - 0.84 atü (10 - "i2 psi above atmospheric pressure) Immediately after the production lies, the presence

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etneo GasöH at diooeni Üburdrucl: modifi.i3.iert cli "properties dee ball so that the desired gambling wirdo achieved particular gives the presence of (Jas the ball a higher Federungavenaogen (d _o h .., or jump higher if he of a certain height falls, and also increases the resistance of the bali against deformation under a radial load "wL", as exemplified by the tennis racket, \ renn. the "all hit

It can be seen that the above considerations are the same To apply for a tennis ball, every better type of one Balls looks at v / erden kfaiii, at wolcheni the Oberilächw from a sextile medlum is covered, the aua natural and / or synthetic fibers bsateht in an arrangement by which the particular desired playing features of a tennis ball are achieved ^

Although this overpressure in the cover gives the ball desirable playing features, it is also accompanied by undesirable features, such as the slow diffusion of gas from inside the cover due to the pressure differences that exist on either side of the wall of the cover hang together. Because of the effect deo Uberatmosspliäriechen Inn ^ ndruoko a on the Spielcjualitäten dee balls change sioh diuae qualities accordingly and eo a condition ov: ceicht, \, o flia Cpi unsatisfactory sincU Peiiagamäsa is en for oinon Dall oi'L'order that he either : '. nnojhaib oiner bontj.iimten, iO

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Ό- Η78021

Time after the production νοΓ \ »εχιΛοΐ will, odor clie BUlIo wütseen before üor Voiv / öndV'Ug in under? Pressure bei'inrtlichcn .üoson or other containers eingoßchlosron aoin so oxidase 2> uckdifferena i * lowered over the wall of the ball shell or / uieen beoeitigt <vird _o 'Both Verfahrenav bring inconvenience and costs associated with calibration,

It is oraichtlich that ου an advantage would be if "could produce at balls without the difficulties associated with the usual miter I) J ¹ KLA be.finaliehen ball covers vortaiUpf'fc oindr Such difficulties were brought on oin Hinimiua or avoided if The overpressure in the ball cover is considerably reduced. or could smoked gauze right away, you must also see that the biffuaionageechwindigksit of the (Jaees from the inside of the cover would be the slower, the more the value of the pressure on; and no diffUBion takes place «if the prints are the same.

One aim of the invention ie / fc demgemfeEB the 'production of game balls, which have a considerably reduced overpressure inside or an overpressure of Hull «

Under a "considerably reduced" overpressure inside, a pressure is exerted which is compared to the usual Innondpressure in ball covers is considerably reduced. in the In the case of a Tennio & allß an internal pressure of tie 2U is approximately

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0.42 kg / om {6 psi) above atmospheric pressure as ^M considerably reduced 1: 1 zh "compared to the usual pressure of 0.70 - 0.84 atmospheres

If a ball is made with reduced internal or zero overpressure, the wall of the shell must, to a considerable extent, meet the required suspension properties and contribute to the resistance to deformation or impart the properties without external help, There can be satisfactory ballο with reduced overpressure or produced with zero overpressure using essentially conventional rubber or rubber-like bags if you put the wall thickness of the ball cover around a Considerably increased. It is found, however, that in doing so the weight of the ball is increased considerably, and in the case of a tennis ball, the resulting weight would be outside the Limits set by the controlling associations · Such a procedure is therefore unsatisfactory ♦

It has been found that the desired properties of resilience, resistance to deformation and weight can be achieved by using particular low density gauges in which alo reinforcing fillers include certain thermoplastic synthetic resins with densities in the range of 0.80-1 , 25 g / com, in distributed form, are introduced ο

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In accordance with the invention, a ball cover comprises a self-supporting one Hollow sphere made from a vulcanized mixture of Hatur and / or Synthetic chalk in which there is a low-density reinforcing filler consisting of a thermoplastic synthetic bar of the self-reinforcing type, the parts of which are distributed in a matrix of the vulcanized natural and / or synthetic chewing mixture.

Under a self-supporting hollow sphere is a sphere su understand $ NaOH deformation su a substantially spherical shape returns, without support by a bubble inside or other internal reinforcement. A synthetic resin of the self-reinforcing type is to be understood as meaning a synthetic resin which can form commercial products in an unmixed state. The invention does not encompass the use of resins of the usual reinforcing type, such as the hard copolymers of butadiene and styrene which are normally used as components in the manufacture of chewing liquors. Harae of the self-reinforcing type can be processed on Ub-Iiohen plastic equipment without the addition of other components. Some examples of the thermoplastic synthetic resins of the self-reinforcing type are polypropylene, polyethylene and aoryl nitrile / butadiene / stvrol interpolymers.

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-6- H78021

Usually the reinforcing flillatoff has a dense tone about 1 g / ocm, i.e. in the range of 0.80 - 1.25 g / ocm. The densities of the resins given above are as follows;

Polypropylene 0.9 Polyethylene 0.91-0.96

SECTION. 1.01-1.06

These materials can be distributed in natural and / or synthetic chewy mixtures, for example in a proportion of up to 50 ow, in particular 20 to 40 wt they are available in the form of small discreet for sale. This can verified by observing sections of the resulting mixture under a high-magnification microscope. It should be emphasized that the synthetic knuckle used here β no homogeneous mixtures with the matrix of the rubber mixture form and do not participate in volcanic formation episodes (dor nor » painter catfish with Sohtfefel aall vulcanizing agent is carried out under the 3SiA effect of heat, if the mixture is actually a mixture vulcanizable by sulfur)

It has been found that the temperature at which the synthetic resin is mixed into the rubber compound is considered * It must be ensured that completely satisfactory ball properties are obtained. If that used synthetic ears

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for example, polypropylene or a Aorylnitril / butadiene / styrene interpolymer 1st, mixing should be carried out so that the final temperature in the Bereioh of 160 - is 190 ⁰ C · It provides feet that Orösse feilohen of discrete synthetic resin critically τοη depends on the final Mlsohtemperatur, and its diameter should preferably be in the range of 1 - 5 μ . If gröeeere particles are present, as is the case when the final! High temperature is below 160 ⁰ C in Pail of the aforementioned special synthetic resins Haltbarkelt the ball case is art beträohtlioh verrin. When using τοη final misash temperatures above 190 ⁰ O one finds, again based on these special synthetic resins, that the resilience of the matrix made of chewy oat mixture is reduced due to thermal degradation and the jumping properties of the ball obtained are adversely affected.

The rubber mixture is primarily a mixture of letur rubber and / or a synthetic rubber of similar type Characteristics of the pederungsvermeriches like Xaturkautaehuk, like cia-polyisoprene or polybutadiene. Mlsohbeeteilteile, such as TuI-kaniBationsmittel and accelerator and reinforcing filler · high density such as rues can be added if necessary. In general, the requirements for a Xautsohuk- »Ooh for the production of a fennlsbaXlhulle a suspension · - · ability of the mixture (measured on the Dunlop Tripeoaettr,

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British Standard 90? Tell A 8) over 65 5 * especially 75 - 80 and a · hardness of the mixture (measured according to the British Standard 903 leil A 7) ron over 65 °, especially 75-80 °

In the worst case, a considerably reduced internal overpressure within the ball cover can be induced, for example by introducing a nitrogen-supplying combination of breathers into the room, so that a ball cover is formed which contains nitrogen up to 0.42 kg / om ^{2 in} the event of overpressure.

The following examples, in which all files are based on weight, illustrate the invention without restricting it as follows.

Example 1 -

Initially, the formulations of two mixtures are given, from which satisfactory balls can be produced with the inner pressure valve of the invention. The matrix material is in any case a Vaturkautsohukmlsohung.

9098Θ2 / 053Θ

100.00 - 100.00 Haturkautβohuk 35.00 Aoryl nitrile / butadiene / btyrene interpolyaeree - Α · Β · ο · - 22.00 Polypropylene 5.00 5.00 Zinc oxide 0.60 0.85 Stearic acid 1.25 1.00 Anti oxidans (Honox ^T / S «L.) - 5.00 Roe " - 3.5 mineral oil - 0.5 Benzoic acid 3.8 2.9 Soh sulfur 1.9 1.8 Biphenylguanldln 1.3 1.0 Dibenathiazyl disulfide SECTION. is a

You above Xisohungen were bo gealsoht, daee the Endtenperatur was 165 ⁰ C * ball covers were made of the mixtures of "by the shells γοη at a temperature 155 ⁰ C for a period Ton 7 minutes were gefornt" They were then made iu tennis balls by a customary tennis ball ball was applied, and were further preesgeforat for 10 minutes at a temperature of 130 ° 0.

It has been found that the tennis balls obtained during VaIIeH-laeeen from a height of 254 em to a height of 13? oa

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gen (regulation of the "International Lawn Tennis Federation": 135 - 147 ora or 53 - 58 ") · The compression characteristics when measured in the manner prescribed by the International Lawn Tennis Federation were also found to be satisfactory»

Example 2

ψ Balls with a considerably reduced inner overpressure can be made from the above mixes, but the details of how they are made differ in the following points:

1.) 0.09 g of sodium nitrite and 0.08 g of aanonium chloride crystals were introduced into the ball cover before foresting.

? ^x Daa forms the ball cover is at a temperature of 145 ⁰ O carried out for a period of 7 minutes.

Tennis balls made from these ball covers by applying Tennis Ball Melton as before and further press-molding for 10 minutes at 130 ⁰ C.

The jumping and compression merges showed up as before as L peacemaker

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11 _ U78021

The two registrations of the same applicant tob the same day with the British; registration a ~ ffr. 28526/64 »the internal file number Case Nr, BS 3895 II and the title •• ^{Spielbälle 11} as well as the British registration no. 28 327/64, the internal. Case Hr, BS 3896 III and the title "Spielbugeln". In these applications, further mixtures are described which make it possible to achieve the present objective SU. It should be noted that the mixtures described in any of the three patent applications can be mixed together in any proportion and satisfactory balls and tennis balls can be formed with significantly reduced internal pressure or with zero internal pressure, with due consideration being given to mixing and molding conditions .

geeäfi corresponding to British patent application 26326/64 German patent application contains the Miaohung a reinforcement ·· Low-density filler that divides it into cellulose-containing tea Contains material. .

According to the corresponding British patent application 28327/64 German patent application is lower than reinforcement filler Diohte uses a thermosetting synthetic resin of phenol type. (Low density filler means one each Density from 0.8 - 1.25 g / ccm)

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Claims (1)

U78021 Claims 1. Ball cover, characterized by a self-supporting hollow " Sphere from a natural and / or synthetic chewing substance, in which lies a reinforcing filler of low density, which consists of a thermoplastic synthetic material of the self-reinforcing type »of the particle in a matrix the vulcanized natural and / or synthetic rubber mixture are distributed, 2. Ball cover according to claim 1, characterized in that « thermoplastic synthetic resin has a density in the range of 0.80-1.25 g / o cm. 3 «ball cover according to one of the preceding claims, thereby marked »that the thermoplastic synthetic ear» is »present« in an amount of 20-40% by weight, based on the Kaatschefc content in the rubber mixture 4. Ball cover according to one of the preceding claims, thereby marked that the thermoplastic «synthetic bar · poly * · propylene 1st 5. ball cover according to any one of claims 1-3, characterized in that the thermoplastic synthetic resin is a 909882/0538 ^ ₀ Aorylnitrile / butadiene / styrene interpolyneree is 6. Ball cover naoh one of claims 1-3 and 5 t gekennseiohnet duroh a hollow ball from a Tulcanized laturkautBohukniBohung, which contains small discrete particles of an acrylonitrile / butadisa / styrene interpolyner dispersed therein Susannen ait Hieohbeetandteile, whereby Einsohliseslioh τοaohenken for the Tulcanaturationea Interpolymers in a nominal proportion τοη 30 - 40 parts per 100 parts laturkautsohuk Tor lies. 7 · Ball cover according to one of the claims 1 - 4 _t made by a hollow ball of a rulkanieierte laturkaut Bohukmisohung, the small discrete part above τοη polypropylene dispersed in it contains sussmmsn with misoh constituents as included, where the τοη in a quantity of polykanieationsmitts 30-40 parts each. 100 parts Haturkautsohuk gate lies Θ. Ball cover near one of the previous anaprfiohs, gel was without a rubber mixture, in which a thsrmoplastic synthetic hexes were poured at a mixing temperature in the range of 160 - 19O ⁰ O " 9 · Ball cover according to one of the goal-related claims »daduroh known »that the parts of the tiiempplastiaobam syathetisehen Harses have a Durohmeeeer in the range τοη 1 to 5 ρ · 909882/0538 10. Ball cover according to one of the preceding claims, characterized marked that the interior overdruok Hull "deceives. 11. Ball cover according to any one of claims 1-9, characterized in that it contains nitrogen gas with an internal pressure of up to 0.42 kg / cm ² . P 12. lawn ball, characterized by a ball cover according to one of the preceding claims, which alt a Textllmedlvai is covered. 13. A method for producing a ball cover, characterized in that the particles of a thermoplastic synthetic material Lake of the self-reinforcing hyp «ale ver: ratär) cunga filler lower diet in a matrix of a tulka and / or Syntheeekeaiteohttkaieohung be distributed, a self-. load-bearing hollow ball is formed from the reinforced plastic shell and the rubber mixture is vulcanized 14% method according to claim 13 * characterized in that the · as synthetic Hare polypropylene or an Aorylnitrll / Butadlea / Btr rol-Interpolyaerea is used The method according to claim 14 is rewarded with the fact that the synthetic ears are mixed with the chewing ears in such a way that the bath seam temperature is in the range of 160 - 19O ⁰ O. 909882/0538 -is- H78021 16. Honor peat according to «inen der Aneprttohe 13-15» characterized by that a nitrogen supplying »material is introduced into the Kauteohukmieohone · 17 · " Tennis ball · manufactured according to Atm Terfahren according to one of the requirements 13-16. 909882/0538