CN101850170B - Pingpong ball with overall seamless structure - Google Patents

Pingpong ball with overall seamless structure Download PDF

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Publication number
CN101850170B
CN101850170B CN200910038310.1A CN200910038310A CN101850170B CN 101850170 B CN101850170 B CN 101850170B CN 200910038310 A CN200910038310 A CN 200910038310A CN 101850170 B CN101850170 B CN 101850170B
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spherical shell
table tennis
spherical
overall
ball
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CN101850170A (en
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张辉伦
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Priority to CN200910038310.1A priority Critical patent/CN101850170B/en
Priority to PCT/CN2010/071260 priority patent/WO2010111920A1/en
Priority to JP2011548522A priority patent/JP2012517248A/en
Priority to DE112010001430T priority patent/DE112010001430T5/en
Publication of CN101850170A publication Critical patent/CN101850170A/en
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    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63BAPPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B39/00Hollow non-inflatable balls, i.e. having no valves
    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63BAPPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B45/00Apparatus or methods for manufacturing balls
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C41/00Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/02Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
    • B29C41/04Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29DPRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D22/00Producing hollow articles
    • B29D22/04Spherical articles, e.g. balls
    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63BAPPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2102/00Application of clubs, bats, rackets or the like to the sporting activity ; particular sports involving the use of balls and clubs, bats, rackets, or the like
    • A63B2102/16Table tennis
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00Other particular articles
    • B29L2031/54Balls

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Moulding By Coating Moulds (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

The invention discloses a pingpong ball with an overall seamless structure. The pingpong ball with the overall seamless structure is formed by an overall hollow thin-wall spherical shell independently. The spherical shell is of an overall structure which is molded once. The overall spherical shell is seamless; no reprocessing connecting seam in forms of an adhesive seam, a welding seam, a press seam or the like is reserved in the shell body of the spherical shell; no visible connecting seam is reserved on the inner surface of the spherical shell; any position at the spherical shell has the same wall thickness; the overall inner surface of the spherical shell is a complete continuous spherical surface; and a gas with a certain pressure is in the spherical shell. The pingpong ball is molded once by overall rotation, and has the characteristics of less production processes, simple process, high product qualification rate, low cost, uniform ball bounce and environmentally-friendly production.

Description

A kind of table tennis of integral seamless structure
Affiliated technical field
The present invention relates to a kind of integral seamless, the table tennis that wall thickness is identical, this table tennis only independently consists of an one-time formed sealing spherical shell, the wall thickness of spherical shell is identical, integral seamless, in the housing of spherical shell, without any as the reprocessing connecting sewing of the forms such as cemented side seam, soldered, pressing seam, the whole inner surface of table tennis is a complete continuous sphere.The table tennis of this new construction, spring is even, good combination property.
Background technology
The structure of existing table tennis is normally: table tennis is connected into the ball of the sealing of a hollow by modes such as bonding, welding or pressings by two hemispherical thin-walled plastic spherical shells, the outer surface of ball reaches the requirement of close joint after polishing, the outer surface that is ball does not have obvious visible connecting sewing, the outer surface of ball is a complete continuous sphere, and the ball of this structure is called close joint table tennis.But this ball is still seamed ball, the inner surface of table tennis has the existence of obvious visible connecting sewing, because of jointed existence, the inner surface of ball is not a complete continuous sphere, simultaneously, although in the junction of two hemispherical spherical shells of ball, be close seamed construction, the seam that is invisible to the naked eye, still tangible reprocessing connecting sewing exists.Aspect material, celluloid is still the main raw material(s) of manufacturing table tennis, at present, the official ball of International Table Tennis Federation's approval, its material is still celluloid.Celluloid material has known unstability and inflammable danger, holds aborning the security incident of fire hazardous aspect.Existing celluloid table tennis be also with two hemispheric spherical shells through bonding formation, with celluloid, manufacture the complex process of table tennis, the production cycle is long, cost is high.International Table Tennis Federation clearly stipulates in its technological document (Technical Leaflet T3) standard (hereinafter to be referred as T3 standard) for this reason: encourage and support that producer develops new better material substitution celluloid.So that produce performance better, the table tennis of more stable more environmental protection.
International Table Tennis Federation's several technical indicators such as the diameter to table tennis (also claiming circularity), weight, bias (also claiming rollability), hardness, spring in T3 standard have strict regulation, and the requirement that the table tennis that new material or new moulding process produce will reach similar or exceed this standard has suitable difficulty.Some units or individual are studied this respect, aspect new table tennis moulding process, application number at home: introduced a kind of by first plastics extrusion molding in 01126885.9, the technique of the similar blowing of twice progressive die again, but the table tennis that this technique produces, its wall unevenness is even, thereby does not all reach T3 standard in hardness requirement and spring aspect requiring two.New table tennis material development aspect, application number at home: introduced the material that a kind of MPS is main body in 90103206.9; Domestic applications number: the material of also having introduced a kind of organic noncrosslinking polymer in 200680034220.X; The table tennis producers such as domestic Pisces and Double Happiness have also carried out relevant research to this respect, but these new materials are being made on the moulding process of table tennis, it is still the moulding process of continuing to use similar traditional table tennis, be that the modes such as first injection moulding or punching press are made hemispherical Shell, then two hemispherical Shells are formed by connecting by modes such as bonding, welding, pressings.Its technique is more complicated the same as traditional table tennis still, even if the table tennis producing meets T3 standard-required, production cost is also difficult to reduce.
From the technique of existing manufacture table tennis, first make two hemispheric spherical shells, then by bonding two hemispherical spherical shell postmenstruations and become the table tennis of the hollow of a sealing.During production, should guarantee that two hemispheres wall thickness will equate, guarantee again the weight precision of ball, also will guarantee bonding reliable.Operation is many, complex process, and production difficulty is large, and product percent of pass is low.This production technology, from the outer surface of ball, cemented side seam after swollen ball through grinding process, reached close joint requirement, the outer surface of ball is a complete continuous sphere.But the inside of ball obviously protrudes from the inner surface of ball at cemented side seam place, form an annular projection band, therefore, at the wall thickness of spherical shell and the wall thickness of other position of seam crossing, be obviously not identical.And the ball of employing blow molding process moulding, it is the endless belt that has an obvious visible depression at the inner surface of the ball of pressing seam crossing, thereby the wall thickness of seam crossing and other position be also different, from the inner surface of ball, can obviously find out that table tennis is also to be formed by two hemispherical Shell pressings.The existence of projection band or hollow zone can make the hardness of seam crossing and the hardness of two hemispheres top and other position be difficult to be consistent, spring is also difficult consistent, the inner surface of while ball also by projection, is with or hollow zone is separated into two parts, is not a complete continuous sphere.If do not form projection band at inner surface while making two halves spherical shell bonding, making the inner surface of ball the same with outer surface is all a complete continuous sphere, from technique, cannot accomplish.Even if obtain, at the firmness of seam crossing, be also difficult to guarantee, meanwhile, although naked eyes are invisible, still have the existence of reprocessing seam in the housing of spherical shell, will reduce the service life of ball.Even if two hemispheres adopts the modes such as welding, pressing to connect, also all can there is above-mentioned similar problem.As long as therefore there is the existence of connecting sewing, even if do not protrude or be depressed in the inner surface of ball, all can affect the quality of ball.Thus, if what do not change existing table tennis thisly has reprocessing connecting sewing and not identical structural disadvantages of wall thickness, even if adopt quality than the material of the more stable more environmental protection of celluloid, be also difficult to produce the product of quality and the remarkable improvement of the existing celluloid table tennis of Performance Ratio.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of integral seamless, the table tennis that wall thickness is identical.This table tennis only independently consists of the thin spherical shell of an one-time formed sealing, the spherical shell integral seamless of table tennis, wall thickness is identical, in the housing of spherical shell without any as the reprocessing connecting sewing of the forms such as cemented side seam, soldered, pressing seam, the inner surface of spherical shell is also without any visible connecting sewing, and the whole inner surface of table tennis is a complete continuous sphere.During production, only need in the materials such as known general-purpose plastics, engineering plastics and special plastic, choose physical property close with celluloid, but the plastics of stable material quality, environmental protection, just can produce diameter, weight, bias, hardness, spring etc. several aspect the higher table tennis of requirement of the T3 of Dou Bi International Table Tennis Federation standard.Table tennis one-shot forming, technique is simple, easy to operate.The cost of the relevant device of moulding is simultaneously also lower, and production process is not polluted environment, is conducive to the production in enormous quantities of table tennis.
The technical solution adopted in the present invention is: the die cavity of mould is spherical, mould is along orthogonal two axis High Rotation Speeds, article two, rotation all passes through the centre of sphere of spherical die cavity, under the acting in conjunction of centrifugal force and material self gravitation, material in die cavity with regard to even thickness be distributed on the inwall of spherical die cavity, keep mould normally to rotate, the material in die cavity occurs to solidify and becomes solid.Cooling, the demoulding, then through post processing such as polishing outer surface etc., just can obtain integral seamless, table tennis that wall thickness is identical.The thin spherical shell of a table tennis sealing by a complete hollow forms, spherical shell is one-time formed overall structure, integral seamless, in the housing of spherical shell without any as the reprocessing connecting sewing of the forms such as cemented side seam, soldered, pressing seam, the optional position of spherical shell all has identical wall thickness, the inner surface of spherical shell is without any visible connecting sewing, and the whole inner surface of spherical shell is a complete continuous sphere.After blowing mold closing in mould, toward the gas that is filled with certain pressure in die cavity, guaranteeing hermetically sealed mold closing, do not leak rotational forming again under the gastight condition of material, the table tennis forming out like this, the gas pressure of the hollow inside of spherical shell is identical with the pressure of the gas being filled with in die cavity before moulding.In this way, in the situation that producing table tennis with same material, can regulate within the specific limits the spring of table tennis and the performance of hardness aspect, make spring more stable.When user plays table tennis, the feel of the ball is better, and the forward momentum of ball is stronger.Under normal circumstances, the pressure of table tennis internal gas is at 9 below standard atmospheric pressure, preferably 3 below standard atmospheric pressure, the too high meeting of air pressure is easily out of shape table tennis, even can make ball fractured.
Integral seamless provided by the present invention, the identical table tennis of wall thickness.Its moulding process is the deficiency of improving existing rotational moulding (also crying rotational forming) technique, a kind of twin shaft centrifugal force rotational molding technology simultaneously designing according to the construction features of table tennis self.Existing rotational molding technique, although mould also can rotate around orthogonal two axles (axle in length and breadth) simultaneously, but mould is not high with respect to the position installation accuracy of diaxon axis, mould rotating speed is not high simultaneously, common rotating speed per minute is only several to be forwarded tens to and turns, the maximum speed adjustable range of its main shaft is conventionally also only on per minute tens right sides of turning left, when mould low speed rotation, material just relies on the gravity of self to be successively coated on the inwall of mould cavity, and these are main causes that wall thickness accuracy is not high, production efficiency is lower of the product after moulding.If it is little to adopt existing rotational molding technique to produce this volume of table tennis, ball wall very thin (average wall thickness of existing celluloid table tennis is less than 0.5 millimeter) and wall thickness accuracy require again very high product, and not only cost is very high, is also difficult to moulding.Rotational molding technology after improvement, diaxon rotating speed speed adjustable range can severally be forwarded to per minute several thousand and turns even several ten thousand and turn by per minute.As long as two orthogonal axis of assurance are with the registration accuracy of the die cavity centre of sphere, and the running accuracy of diaxon, rationally adjust the rotating speed of diaxon, just can stably produce integral seamless and the identical table tennis of wall thickness one by one.The test result of experiment and batch production shows, the error of the wall thickness of the spherical shell of table tennis can accurately be controlled within 0.01 millimeter, therefore, obviously not identical seamed table tennis of the wall thickness that tradition is combined by two hemisphere relatively, can say so, the optional position of the spherical shell of this integral seamless table tennis all has identical wall thickness.
The invention has the beneficial effects as follows, this table tennis only independently consists of an one-time formed sealing spherical shell, and the wall thickness of spherical shell is identical, and in the housing of spherical shell, without any the reprocessing connecting sewing of form, the inner surface of spherical shell is also without any the visible connecting sewing of form.Only need in known plastics, choose physical property and celluloid is close, but the material of stable material quality, environmental protection just can produce table tennis functional, Environmental Safety in enormous quantities.In production process, test, this table tennis all reaches the requirement higher than T3 standard in diameter, weight, bias, hardness, spring etc. aspect several.Because table tennis is Integratively formed, operation is few, and technique is simple, and product percent of pass is high, and cost is low, and the cost of ball is only equivalent to the 60%-72% of existing celluloid table tennis.Simultaneously relevant production equipment cost is low, takes up an area less, consumes energy little, during production, environment is not polluted, and is conducive to the production in enormous quantities of table tennis.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
Accompanying drawing is the schematic diagram of cutaway view of the present invention.
1. spherical shell 2. outer surface 3. inner surfaces in figure
The specific embodiment
In the accompanying drawings, spherical shell (1) is the thin-walled plastic housing of the sealing of High Rotation Speed one-time formed hollow, there is the gas (gas not shown in FIG.) of certain pressure the inside of hollow, the pressure of gas below standard atmospheric pressure, has outer surface (2) and inner surface (3) at 9 on spherical shell (1).Complete table tennis be exactly by one independently spherical shell (1) form, because spherical shell (1) is Integratively formed, so spherical shell (1) is the absolute construction of integral seamless, in the housing of spherical shell (1) without any as the reprocessing connecting sewing of the forms such as cemented side seam, soldered, pressing seam, meanwhile, the optional position of spherical shell (1) has identical wall thickness.The whole surface of inner surface (3) is also without any the visible connecting sewing of form, and the whole surface of inner surface (3) is a complete continuous sphere.Outer surface (2) is the complete continuous sphere being polished into according to T3 standard.

Claims (4)

1. a table tennis, thin-walled plastic shell by the sealing of hollow forms, it is characterized in that: the spherical shell of a table tennis sealing by a complete hollow independently forms, spherical shell is one-time formed overall structure, integral seamless, in the housing of spherical shell without any the reprocessing connecting sewing of form, the inner surface of spherical shell is without any visible connecting sewing, the whole inner surface of spherical shell is a complete continuous sphere, described table tennis is to form by twin shaft centrifugal force rotational molding technology, wherein, the die cavity of mould is spherical, mould is along orthogonal two axis High Rotation Speeds, article two, rotation all passes through the centre of sphere of spherical die cavity, under the acting in conjunction of centrifugal force and material self gravitation, material in die cavity with regard to even thickness be distributed on the inwall of spherical die cavity, keep mould normally to rotate, material in die cavity occurs to solidify and becomes solid, cooling, the demoulding, again through polishing outer surface post processing, just can obtain integral seamless, the table tennis that wall thickness is identical.
2. table tennis according to claim 1, is characterized in that: the optional position of spherical shell all has identical wall thickness.
3. table tennis according to claim 1, is characterized in that: there is pressure the hollow inside of spherical shell at 9 gases below standard atmospheric pressure.
4. table tennis according to claim 1, is characterized in that: there is pressure the hollow inside of spherical shell at 3 gases below standard atmospheric pressure.
CN200910038310.1A 2009-03-31 2009-03-31 Pingpong ball with overall seamless structure Active CN101850170B (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN200910038310.1A CN101850170B (en) 2009-03-31 2009-03-31 Pingpong ball with overall seamless structure
PCT/CN2010/071260 WO2010111920A1 (en) 2009-03-31 2010-03-24 Table tennis ball with seamless whole structure
JP2011548522A JP2012517248A (en) 2009-03-31 2010-03-24 Table tennis balls with a seamless structure throughout
DE112010001430T DE112010001430T5 (en) 2009-03-31 2010-03-24 Table tennis ball with a completely seamless structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN200910038310.1A CN101850170B (en) 2009-03-31 2009-03-31 Pingpong ball with overall seamless structure

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CN101850170A CN101850170A (en) 2010-10-06
CN101850170B true CN101850170B (en) 2014-04-16

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JP (1) JP2012517248A (en)
CN (1) CN101850170B (en)
DE (1) DE112010001430T5 (en)
WO (1) WO2010111920A1 (en)

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CN202028125U (en) * 2011-01-25 2011-11-09 林明龙 Seamless integrally-formed solid sphere
CN102896788A (en) * 2012-10-17 2013-01-30 丁杭峰 Injection-molded celluloid-free table tennis
KR102178430B1 (en) 2013-04-26 2020-11-13 도레이 카부시키가이샤 Table tennis ball and table tennis ball-use thermoplastic resin composition
CN103394180B (en) * 2013-08-12 2016-02-17 信阳农林学院 Anti-deformation table tennis preparation method
DE102014105552A1 (en) * 2014-04-17 2015-10-22 Krones Ag Reference product and method for validating the damage rate of fruit pulp processing plants
CN105080081A (en) * 2015-07-28 2015-11-25 上海红双喜股份有限公司 Connecting structure and manufacturing method for two hemispheres of table tennis
CN106863873A (en) * 2016-12-28 2017-06-20 东莞市聚成福环保材料有限公司 A kind of manufacture craft of shock-absorbing sole
CN107791425A (en) * 2017-12-01 2018-03-13 肖玲丽 A kind of production system of polyurethane table tennis
CN108261734A (en) * 2018-01-31 2018-07-10 海宁市博展经编有限公司 A kind of manufacture craft of seamless table tennis
CN108042990B (en) * 2018-02-09 2022-12-13 华北理工大学 Table tennis for training and forming device thereof
CN108310731B (en) * 2018-04-13 2020-08-04 程子杰 Seamless table tennis ball with built-in equatorial ring and manufacturing process thereof
CN108499052B (en) * 2018-04-20 2023-08-15 苏州聚慧体育用品有限公司 Rubber ball machine for table tennis
CN109999437A (en) * 2019-05-06 2019-07-12 丁修宇 Disposal molding has the seamless table tennis of interior lines

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CN101272830A (en) * 2005-09-15 2008-09-24 柳仁淑国际项目管理公司 Celluloid-free table-tennis ball
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GB484433A (en) * 1936-04-17 1938-05-05 Daniel Claxton Mabee Improvements in and relating to table tennis and like balls
CN1057790A (en) * 1990-06-26 1992-01-15 广州市文教体育用品工业公司 Modified polystyrene table tennis ball
CN1410250A (en) * 2001-09-25 2003-04-16 骆益群 Table tennis and its preparation method
CN101272830A (en) * 2005-09-15 2008-09-24 柳仁淑国际项目管理公司 Celluloid-free table-tennis ball
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Publication number Publication date
WO2010111920A1 (en) 2010-10-07
JP2012517248A (en) 2012-08-02
DE112010001430T5 (en) 2012-08-30
CN101850170A (en) 2010-10-06

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