CN101850170A - Pingpong ball with overall seamless structure - Google Patents
Pingpong ball with overall seamless structure Download PDFInfo
- Publication number
- CN101850170A CN101850170A CN200910038310A CN200910038310A CN101850170A CN 101850170 A CN101850170 A CN 101850170A CN 200910038310 A CN200910038310 A CN 200910038310A CN 200910038310 A CN200910038310 A CN 200910038310A CN 101850170 A CN101850170 A CN 101850170A
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- CN
- China
- Prior art keywords
- spherical shell
- table tennis
- overall
- ball
- seam
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B39/00—Hollow non-inflatable balls, i.e. having no valves
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B45/00—Apparatus or methods for manufacturing balls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping 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
- B29C41/04—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D22/00—Producing hollow articles
- B29D22/04—Spherical articles, e.g. balls
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B2102/00—Application 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
- A63B2102/16—Table tennis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/54—Balls
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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
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 is made of an one-time formed sealing spherical shell, the wall thickness of spherical shell is identical, integral seamless, connect seam without any the reprocessing as forms such as cemented side seam, soldered, pressing seams in the housing of spherical shell, the total inner surface of table tennis is the sphere of a complete and continuous.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 connection seam, the outer surface of ball is the sphere of a complete and continuous, and the ball of this structure is called the close joint table tennis.But this ball still is that the seam ball is arranged, the inner surface of table tennis has the existence of obvious visible connection seam, because of jointed existence, the inner surface of ball is not the sphere of a complete and continuous, simultaneously, though the junction at two hemispherical spherical shells of ball is a close seamed construction, the seam that is invisible to the naked eye, still tangible reprocessing connects seam and exists.Aspect material, celluloid still is a main raw material(s) of making table tennis, at present, the official ball of International Table Tennis Federation's approval, its material still is a celluloid.The celluloid material has known unstability and inflammable danger, causes the security incident of fire aspect aborning easily.Existing celluloid table tennis also be with two hemispheric spherical shells through bonding formation, with the complex process of celluloid manufacturing table tennis, the production cycle is long, the cost height.International Table Tennis Federation clearly stipulates in its technological document (Technical Leaflet T3) standard (hereinafter to be referred as the T3 standard) for this reason: encourage and support the new better material of producer's development to substitute celluloid.So that produce performance better, the table tennis of more stable more environmental protection.
There is strict regulation in International Table Tennis Federation to several technical indicators such as the diameter (also claiming circularity) of table tennis, weight, off-centre (also claiming rollability), hardness, springs in the T3 standard, the requirement that the table tennis that new material or new moulding process produce will reach similar or surpass this standard has suitable difficulty.Some units or individual study this respect, aspect new table tennis moulding process, application number at home: introduced a kind of in 01126885.9 with plastics elder generation extrusion molding, the technology of the similar blowing of twice progressive die again, but the table tennis that this technology produces, its wall unevenness is even, thereby requires and spring does not all reach the T3 standard aspect requiring two in hardness.New table tennis material development aspect, application number at home: introduced the material that a kind of MPS is a main body in 90103206.9; Domestic applications number: the material of also having introduced a kind of organic noncrosslinking polymer among the 200680034220.X; Domestic Pisces has also carried out relevant research to this respect with table tennis producers such as Double Happiness, but these new materials are on the moulding process of making table tennis, it still is the moulding process of continuing to use similar traditional table tennis, be that modes such as first injection moulding or punching press are made hemispherical Shell, again two hemispherical Shells be formed by connecting by modes such as bonding, welding, pressings.Still the same with the traditional table tennis more complicated of its technology, even the table tennis that produces satisfies the T3 standard-required, production cost also is difficult to reduce.
From the existing technology of making table tennis, make two hemispheric spherical shells earlier, again that two hemispherical spherical shell postmenstruations is bonding and become the table tennis of the hollow of a sealing.Should guarantee during production that the two hemispheres wall thickness will equate, guarantee the weight precision of ball again, also will guarantee bonding reliable.Operation is many, complex process, and the production difficulty is big, and product percent of pass is low.This production technology, from the outer surface of ball, cemented side seam at swollen ball after grinding process, reached close joint requirement, the outer surface of ball is the sphere of a complete and continuous.But the inside of ball obviously protrudes from the inner surface of ball at the cemented side seam place, forms the projection band of an annular, therefore, is obviously inequality at the wall thickness of the spherical shell of seam crossing and the wall thickness of other position.And the ball of employing blow molding process moulding, it then is the endless belt that an obvious visible depression is arranged at the inner surface of the ball of pressing seam crossing, thereby the wall thickness of seam crossing also is different with other position, from the inner surface of ball, can find out obviously that table tennis also is 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 is with by projection or hollow zone is separated into two parts, is not the sphere of a complete and continuous.If do not form the projection band at inner surface when making the two halves spherical shell bonding, making the inner surface of ball the same with outer surface all is the sphere of a complete and continuous, can't accomplish from technology.Obtain even do, also be difficult to guarantee in the bonding fastness of seam crossing, simultaneously, though 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 two hemispheres adopts modes such as welding, pressing to connect, also all above-mentioned similar problem can be arranged.As long as therefore the existence that connects seam is arranged,, all can influence the quality of ball even do not protrude or be depressed in the inner surface of ball.Thus, there is not reprocessing to connect seam and wall thickness structural disadvantages inequality if do not change this of existing table tennis, even adopt the material of quality, also be difficult to produce quality and performance product than the remarkable improvement of existing celluloid table tennis than the more stable more environmental protection of celluloid.
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 is made of the thin spherical shell of an one-time formed sealing, the spherical shell integral seamless of table tennis, wall thickness is identical, connect seam without any reprocessing in the housing of spherical shell as forms such as cemented side seam, soldered, pressing seams, the inner surface of spherical shell does not have any visible connection seam yet, and the total inner surface of table tennis is the sphere of a complete and continuous.It is close with celluloid only to need to choose physical property during production in materials such as known general-purpose plastics, engineering plastics and special plastic, but the plastics of stable material quality, environmental protection, just can produce diameter, weight, off-centre, hardness, spring etc. several aspect all than the higher table tennis of requirement of the T3 of International Table Tennis Federation standard.The table tennis one-shot forming, technology is simple, and is easy to operate.The cost of the relevant device of moulding simultaneously is also lower, and production process is not polluted environment, helps the production in enormous quantities of table tennis.
The technical solution adopted in the present invention is: the die cavity of mould is for spherical, mould rotates at a high speed along orthogonal two axis, 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 the die cavity is evenly distributed on the inwall of spherical die cavity with regard to thickness, keep mould normally to rotate, the material in the die cavity takes place to solidify and becomes solid.Cooling, the demoulding again through post processing such as polishing outer surface etc., just can obtain integral seamless, table tennis that wall thickness is identical.Table tennis only is made of the thin spherical shell of the sealing of a complete hollow, spherical shell is one-time formed overall structure, integral seamless, no any reprocessing as forms such as cemented side seam, soldered, pressing seams connects seam in the housing of spherical shell, the optional position of spherical shell all has identical wall thickness, the inner surface of spherical shell does not have any visible connection seam, and the total inner surface of spherical shell is the sphere of a complete and continuous.Behind blowing and mold closing in mould, charge into the gas of certain pressure in the die cavity, guaranteeing hermetically sealed mold closing, promptly do not leak rotational forming again under the gastight condition of material, the table tennis that forms out like this, the hollow gas inside pressure of spherical shell are then identical with the pressure of the gas that charges in the die cavity before the moulding.In this way,, can regulate the spring of table tennis and the performance of hardness aspect within the specific limits, make spring more stable producing under the situation of table tennis with same material.The feel of the ball was better when the user played table tennis, and the forward momentum of ball is stronger.Generally, the pressure of table tennis internal gas is at 9 below the standard atmospheric pressure, and preferred 3 below the standard atmospheric pressure, the too high meeting of air pressure makes the table tennis easy deformation, even can make ball fractured.
Integral seamless provided by the present invention, the identical table tennis of wall thickness.Its moulding process is a deficiency of improving existing rotational moulding (also crying rotational forming) technology, simultaneously a kind of twin shaft centrifugal force rotational molding technology that designs according to self the construction features of rattling.Existing rotational molding technique, though mould also can be simultaneously around orthogonal two axles (axle in length and breadth) rotation, but mould is not high with respect to the position installation accuracy of two axis, the mould rotating speed is not high simultaneously, usually the per minute rotating speed is only several forwards tens commentaries on classics to, the maximum speed adjustable range of its main shaft is usually also only on per minute tens right side of turning left, when the mould low speed rotation, material just relies on the gravity of self successively to be 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 the 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 very high again product, and not only cost is very high, also is difficult to moulding.Rotational molding technology after the improvement, diaxon rotating speed speed adjustable range can be changeed even several ten thousand commentaries on classics by several per minutes several thousand that forward to of 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.Experiment and the test result of producing in batches show, the error of the wall thickness of the spherical shell of table tennis can accurately be controlled within 0.01 millimeter, therefore, the wall thickness that combined by two hemisphere of tradition is obviously inequality relatively the seam table tennis, 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 that this table tennis only independently is made of an one-time formed sealing spherical shell, the wall thickness of spherical shell is identical, and the reprocessing without any form in the housing of spherical shell connects seam, and the inner surface of spherical shell also stitches without any the visible connection of form.Only need in known plastics, to 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.Test in production process, this table tennis all reaches the requirement higher than T3 standard in diameter, weight, off-centre, hardness, spring etc. aspect several.Because table tennis is Integratively formed, operation is few, and technology is simple, the product percent of pass height, and cost is low, and the cost of ball only is equivalent to the 60%-72% of existing celluloid table tennis.Simultaneously relevant production equipment cost is low, takes up an area of and lacks, and it is little to consume energy, and during production environment is not polluted, and helps the production in enormous quantities of table tennis.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Accompanying drawing is the schematic diagram of cutaway view of the present invention.
1. spherical shells, 2. outer surfaces, 3. inner surfaces among the figure
The specific embodiment
In the accompanying drawings, spherical shell (1) is the thin-walled plastic housing of the sealing of rotation at a high speed and one-time formed hollow, there is the gas (gas does not draw among the figure) of certain pressure the inside of hollow, and the pressure of gas has outer surface (2) and inner surface (3) at 9 below the standard atmospheric pressure on the spherical shell (1).Complete table tennis be exactly by one independently spherical shell (1) constitute, because spherical shell (1) is Integratively formed, so spherical shell (1) is the absolute construction of integral seamless, connect seam without any reprocessing in the housing of spherical shell (1) as forms such as cemented side seam, soldered, pressing seams, simultaneously, the optional position of spherical shell (1) has identical wall thickness.Also without any the visible connection seam of form, the whole surface of inner surface (3) is the sphere of a complete and continuous on the whole surface of inner surface (3).Outer surface (2) is the sphere of a complete and continuous being polished into according to the T3 standard.
Claims (4)
1. table tennis, thin-walled plastic spherical shell by the sealing of hollow constitutes, it is characterized in that: table tennis only independently is made of the spherical shell of the sealing of a complete hollow, the spherical shell integral seamless, reprocessing without any form in the housing of spherical shell connects seam, and the inner surface of spherical shell stitches without any visible connection.
2. table tennis according to claim 1 is characterized in that: the total inner surface of spherical shell is the sphere of a complete and continuous.
3. table tennis according to claim 1 is characterized in that: the optional position of spherical shell all has identical wall thickness.
4. table tennis according to claim 1 is characterized in that: there is pressure the hollow inside of spherical shell at 9 gases below the standard atmospheric pressure, preferred 3 below the standard atmospheric pressure.
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 |
| 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 |
| PCT/CN2010/071260 WO2010111920A1 (en) | 2009-03-31 | 2010-03-24 | Table tennis ball with seamless whole 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101850170A true CN101850170A (en) | 2010-10-06 |
| CN101850170B CN101850170B (en) | 2014-04-16 |
Family
ID=42801956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910038310.1A Active CN101850170B (en) | 2009-03-31 | 2009-03-31 | Pingpong ball with overall seamless structure |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2012517248A (en) |
| CN (1) | CN101850170B (en) |
| DE (1) | DE112010001430T5 (en) |
| WO (1) | WO2010111920A1 (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012100448A1 (en) * | 2011-01-25 | 2012-08-02 | Lin Minglung | One-step molding seamless solid ball |
| CN102896788A (en) * | 2012-10-17 | 2013-01-30 | 丁杭峰 | Injection-molded celluloid-free table tennis |
| CN103394180A (en) * | 2013-08-12 | 2013-11-20 | 苏州启智机电技术有限公司 | Anti-deformed table tennis ball manufacturing method |
| 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 |
| CN107791425A (en) * | 2017-12-01 | 2018-03-13 | 肖玲丽 | A kind of production system of polyurethane table tennis |
| CN108042990A (en) * | 2018-02-09 | 2018-05-18 | 华北理工大学 | A kind of table tennis ball for training and its molding machine |
| WO2018120357A1 (en) * | 2016-12-28 | 2018-07-05 | 东莞市聚成福环保材料有限公司 | Manufacturing process for shock-absorbing shoe sole |
| 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 |
| CN108310731A (en) * | 2018-04-13 | 2018-07-24 | 程子杰 | Built-in equator ring is seamless table tennis and its manufacturing process |
| CN109999437A (en) * | 2019-05-06 | 2019-07-12 | 丁修宇 | Disposal molding has the seamless table tennis of interior lines |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014175132A1 (en) | 2013-04-26 | 2014-10-30 | 日本卓球株式会社 | Table tennis ball and table tennis ball-use thermoplastic resin composition |
| DE102014105552A1 (en) * | 2014-04-17 | 2015-10-22 | Krones Ag | Reference product and method for validating the damage rate of fruit pulp processing plants |
| 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 |
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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 |
| JPS56130328A (en) * | 1980-03-19 | 1981-10-13 | Dainippon Printing Co Ltd | Metal mold apparatus for injection molding hollow semispherical body |
| JPS60145817A (en) * | 1984-05-18 | 1985-08-01 | Dainippon Printing Co Ltd | Manufacture of hollow semispherical body and apparatus therefor |
| 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 |
| JPH0768575A (en) * | 1993-08-02 | 1995-03-14 | Masaru Hiyamizu | Lighting fixtures, vessel, base for placing goods, etc. |
| JP3761222B2 (en) * | 1994-08-05 | 2006-03-29 | エルカメート・クンストシユトッフテヒニック・ゲゼルシヤフト・ミト・ベシユレンクテル・ハフツング | An apparatus for making hollow bodies by rotational melting from a flowable dry thermoplastic synthetic resin. |
| CN1089952C (en) | 1994-08-09 | 2002-08-28 | 廖志成 | Rubber hooped monoway exhaust valve and sealing device for sealed lead accumulator |
| JPH11262923A (en) * | 1998-03-17 | 1999-09-28 | Nippon Zeon Co Ltd | Reactive polymerization molding method |
| CN1410250A (en) * | 2001-09-25 | 2003-04-16 | 骆益群 | Table tennis and its preparation method |
| DE102005044178A1 (en) * | 2005-09-15 | 2007-03-29 | Thomas Dr. Wollheim | Table tennis ball |
| JP3131302U (en) * | 2006-06-20 | 2007-05-10 | 保弘 福田 | Seamless table tennis ball jig and machine |
| CN201453975U (en) * | 2009-03-31 | 2010-05-12 | 张辉伦 | Integral seamless-structure table tennis |
| CN101585224B (en) * | 2009-06-18 | 2012-02-22 | 张�林 | Method for manufacturing reinforced seamless table tennis and manufacturing equipment thereof |
-
2009
- 2009-03-31 CN CN200910038310.1A patent/CN101850170B/en active Active
-
2010
- 2010-03-24 WO PCT/CN2010/071260 patent/WO2010111920A1/en active Application Filing
- 2010-03-24 JP JP2011548522A patent/JP2012517248A/en active Pending
- 2010-03-24 DE DE112010001430T patent/DE112010001430T5/en not_active Withdrawn
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012100448A1 (en) * | 2011-01-25 | 2012-08-02 | Lin Minglung | One-step molding seamless solid ball |
| CN102896788A (en) * | 2012-10-17 | 2013-01-30 | 丁杭峰 | Injection-molded celluloid-free table tennis |
| CN103394180A (en) * | 2013-08-12 | 2013-11-20 | 苏州启智机电技术有限公司 | Anti-deformed table tennis ball manufacturing method |
| CN103394180B (en) * | 2013-08-12 | 2016-02-17 | 信阳农林学院 | Anti-deformation table tennis preparation method |
| 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 |
| WO2018120357A1 (en) * | 2016-12-28 | 2018-07-05 | 东莞市聚成福环保材料有限公司 | Manufacturing process for shock-absorbing shoe 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 |
| CN108042990A (en) * | 2018-02-09 | 2018-05-18 | 华北理工大学 | A kind of table tennis ball for training and its molding machine |
| CN108042990B (en) * | 2018-02-09 | 2022-12-13 | 华北理工大学 | Table tennis for training and forming device thereof |
| CN108310731A (en) * | 2018-04-13 | 2018-07-24 | 程子杰 | Built-in equator ring is seamless table tennis and its manufacturing process |
| CN108310731B (en) * | 2018-04-13 | 2020-08-04 | 程子杰 | Seamless table tennis ball with built-in equatorial ring and manufacturing process thereof |
| CN109999437A (en) * | 2019-05-06 | 2019-07-12 | 丁修宇 | Disposal molding has the seamless table tennis of interior lines |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2010111920A1 (en) | 2010-10-07 |
| JP2012517248A (en) | 2012-08-02 |
| DE112010001430T5 (en) | 2012-08-30 |
| CN101850170B (en) | 2014-04-16 |
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| C06 | Publication | ||
| PB01 | Publication | ||
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