GB185089A - Improved manufacture of tennis balls and like hollow articles - Google Patents

Improved manufacture of tennis balls and like hollow articles

Info

Publication number
GB185089A
GB185089A GB8252/22A GB825222A GB185089A GB 185089 A GB185089 A GB 185089A GB 8252/22 A GB8252/22 A GB 8252/22A GB 825222 A GB825222 A GB 825222A GB 185089 A GB185089 A GB 185089A
Authority
GB
United Kingdom
Prior art keywords
mould
expands
centre
gas
pressure
Prior art date
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.)
Expired
Application number
GB8252/22A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Revere Rubber Co
Original Assignee
Revere Rubber Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Revere Rubber Co filed Critical Revere Rubber Co
Publication of GB185089A publication Critical patent/GB185089A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/46—Component parts, details or accessories; Auxiliary operations characterised by using particular environment or blow fluids other than air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2021/00—Use of unspecified rubbers as moulding material
    • 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
    • B29L2022/00—Hollow articles

Abstract

185,089. Revere Rubber Co., (Assignees of Gibbons, W. A.). Aug. 24, 1921, [Convention date]. Void [Published under Sect. 91 of the Act]. Balls.-Tennis and like balls are vulcanized in a mould under internal fluid pressure, which shapes the article, and after removal from the mould, expands it to a perdetermined size at a predetermined pressure. Definite quantities of a gas-producing substance or mixture, e.g. 0.7 gm. of sodium nitrite and 0.532 gm. of ammonium chloride, although an excess of the latter is generally employed, are placed in a tennis ball " centre " in a mould, and on heating, evolve nitrogen which expands the centre in the mould, and after completion of the cure and removal of the mould, expands the centre further, and maintains a pressure of approximately 22.4 lbs. per sq. in. above atmospheric. Smaller quantities produce lower pressures, which however should always be at least 10 lbs. above atmospheric pressure. The gas-producing ingredients may be introduced in solid form, or in solution, or mixed with agar-agar, or the like. This latter method has the advantage that a gummy, protective coating is formed within the ball. Other gas producing substances specified are (1) any ammonium salt, and any nitrite, (2) sodium peroxide and water, (3) barium peroxide and acid, (4) hydrogen peroxide, (5) any organic compound or mixture, which on heating evolves nitrogen,. (6) an alkali and an ammonium salt.
GB8252/22A 1921-08-24 1922-03-21 Improved manufacture of tennis balls and like hollow articles Expired GB185089A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US185089XA 1921-08-24 1921-08-24

Publications (1)

Publication Number Publication Date
GB185089A true GB185089A (en) 1922-09-28

Family

ID=21788277

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8252/22A Expired GB185089A (en) 1921-08-24 1922-03-21 Improved manufacture of tennis balls and like hollow articles

Country Status (1)

Country Link
GB (1) GB185089A (en)

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