WO2015029761A1 - Corps creux et son procédé de fabrication - Google Patents

Corps creux et son procédé de fabrication Download PDF

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Publication number
WO2015029761A1
WO2015029761A1 PCT/JP2014/071144 JP2014071144W WO2015029761A1 WO 2015029761 A1 WO2015029761 A1 WO 2015029761A1 JP 2014071144 W JP2014071144 W JP 2014071144W WO 2015029761 A1 WO2015029761 A1 WO 2015029761A1
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WIPO (PCT)
Prior art keywords
hollow body
crosslinking
hollow
thermoplastic elastomer
opening
Prior art date
Application number
PCT/JP2014/071144
Other languages
English (en)
Japanese (ja)
Inventor
倉持　浩
Original Assignee
株式会社ポリテック・デザイン
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Publication of WO2015029761A1 publication Critical patent/WO2015029761A1/fr

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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
    • B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
    • B29C69/004—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore making articles by joining parts moulded in separate cavities, said parts being in said separate cavities during said joining
    • 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
    • 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
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7841—Holding or clamping means for handling purposes
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/114—Single butt joints
    • B29C66/1142—Single butt to butt joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/242—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours
    • B29C66/2422—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical
    • B29C66/24221—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical being circular
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
    • B29C66/7375—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined uncured, partially cured or fully cured
    • B29C66/73751—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined uncured, partially cured or fully cured the to-be-joined area of at least one of the parts to be joined being uncured, i.e. non cross-linked, non vulcanized
    • B29C66/73752—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined uncured, partially cured or fully cured the to-be-joined area of at least one of the parts to be joined being uncured, i.e. non cross-linked, non vulcanized the to-be-joined areas of both parts to be joined being uncured
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81431—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single cavity, e.g. a groove
    • 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
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    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/843—Machines for making separate joints at the same time in different planes; Machines for making separate joints at the same time mounted in parallel or in series
    • B29C66/8432—Machines for making separate joints at the same time mounted in parallel or in series
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
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    • B29D22/02—Inflatable articles
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    • B29D22/04—Spherical articles, e.g. balls
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    • A63B2039/003—Hollow non-inflatable balls, i.e. having no valves substantially hollow and pressureless
    • A—HUMAN NECESSITIES
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    • 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
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/743—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/90—Measuring or controlling the joining process
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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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/94—Measuring or controlling the joining process by measuring or controlling the time
    • B29C66/949—Measuring or controlling the joining process by measuring or controlling the time characterised by specific time values or ranges
    • 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
    • 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
    • B29L2031/548—Tennis balls

Definitions

  • the present invention relates to a hollow body used as various game balls such as table tennis balls, toy balls, decorative balls, various floats, valve bodies, roll-on balls, containers and the like, and a method for producing the same.
  • table tennis balls are made of celluloid (a resin produced by mixing camphor as a plasticizer with nitrocellulose).
  • the general manufacturing method is to form a hollow hemisphere by softening a circular celluloid sheet in warm water or hot air, and then fitting the opening edges of the two hemispheres so as to overlap each other.
  • a hollow sphere was obtained by bonding or welding. Therefore, the finished table tennis ball has a fitting seam between the two hemispheres (in addition, the two hemispheres are joined together and then subjected to a polishing process so that the outer surface side of the table tennis ball is The level difference between the two hemispheres disappears, but the level difference remains on the inner surface side).
  • Patent Document 1 and the like disclose a table tennis ball that does not use celluloid and has no fitting joint, and a method for manufacturing the same.
  • the conventional celluloid table tennis ball has the following problems.
  • Patent Document 1 discloses a table tennis ball that does not use celluloid and has no joint joint, and a method for manufacturing the table tennis ball, which is formed by a rotational molding method.
  • the rotational molding method has a problem that the productivity is poor because the mold is housed in the rotation mechanism and rotates, and the liquid or molten raw material is attached to the inner surface of the mold by the rotational centrifugal force. Therefore, there is a problem that the thickness accuracy is poor.
  • a blow molding method, a vacuum molding method, and the like can be considered as a method for producing a hollow sphere without a fitting joint, and these molding methods all have a uniform thickness of the hollow sphere. There is a problem that you can not.
  • the present invention has been made in view of such conventional circumstances, and one of the objects of the present invention is to provide a hollow body that does not use celluloid and a method for producing the same.
  • Another object of the present invention is to provide a hollow body that does not produce a fitting seam and a method for manufacturing the same.
  • Another object of the present invention is to provide a hollow body with good thickness accuracy and uniform thickness in all parts, and a method for manufacturing the same.
  • Another object of the present invention is to provide a hollow body with good productivity and a method for producing the same.
  • the method for producing a hollow body according to the present invention comprises: A thermoplastic elastomer that can be highly cross-linked by chemical cross-linking is placed in a mold with a cross-linking agent added and pressurized, and heated at a low temperature at which no cross-linking reaction takes place, or a cross-linking reaction will occur if the heating time increases.
  • a step of obtaining a hollow first half having an opening on one side by heating and pre-molding for a short time at which a crosslinking reaction does not occur or does not complete crosslinking even at a high heating temperature A thermoplastic elastomer that can be highly crosslinked by chemical crosslinking is placed in a mold with a crosslinking agent added and pressurized, and heated at a low temperature at which no crosslinking reaction occurs, or a crosslinking reaction occurs if the heating time is prolonged.
  • the edge of the opening of the first half and the edge of the opening of the second half are butted against each other and heated at a high temperature to cross-link the first half and the And integrating the second half to form one hollow body and making the hollow body have sufficient hardness.
  • thermoplastic elastomer that can be used as “a thermoplastic elastomer that can be highly crosslinked by chemical crosslinking”
  • a thermoplastic elastomer that can be highly crosslinked by chemical crosslinking 1,2-polybutadiene-based elastomer (manufactured by JSR Corporation, There are a trade name (registered trademark): JSR RB) and a styrene butadiene styrene block copolymer (SBS).
  • thermoplastic elastomer that can be highly crosslinked by chemical crosslinking
  • a hollow body can be constituted without using celluloid (note that the thermoplastic elastomer is crosslinked by being heated at a high temperature, Eventually it becomes a thermosetting resin).
  • first half and the second half are not fitted to each other but are integrated by bridging in a state where the edges of the openings are in contact with each other, a fitting seam does not occur. .
  • the raw material is not attached to the inner surface of the mold in a liquid or molten state as in the case of rotational molding, the raw material is preformed in the state of an elastomer, so that the thickness of the hollow body finally obtained is Can be managed with high accuracy.
  • the hollow body is manufactured regardless of blow molding or vacuum forming, so that the thickness can be made uniform in all parts.
  • the hollow body is manufactured without using rotational molding, the productivity is good.
  • the hardness of the finally obtained hollow body can be adjusted by adjusting the amount of the crosslinking agent.
  • thermoplastic elastomer that can be highly cross-linked by chemical cross-linking is blended with a polymer that can be cross-linked by chemical cross-linking but not as hard as the thermoplastic elastomer, and the blended raw material is preformed to form the first half If the second half is obtained, the hardness of the finally obtained hollow body can be adjusted more easily, and the strength of the finally obtained hollow body can be improved.
  • thermoplastic elastomer when such blending is performed, (i) when a 1,2-polybutadiene-based elastomer is used as a thermoplastic elastomer that can be highly crosslinked by chemical crosslinking, for example, a polyolefin-based thermoplastic elastomer can be blended as the polymer; ii) When a styrene butadiene styrene block copolymer (SBS) is used as a thermoplastic elastomer that can be highly crosslinked by chemical crosslinking, for example, styrene / ethylene / butylene / styrene block copolymer (SEBS) is blended as the polymer. it can.
  • SBS styrene butadiene styrene block copolymer
  • SEBS styrene block copolymer
  • the hollow body according to the present invention comprises a thermoplastic elastomer that can be highly crosslinked by chemical crosslinking, respectively, and a hollow first half and a hollow second half each having an opening on one side. And are integrated by chemical crosslinking in a state where the edges of the openings are butted.
  • the hollow body according to the present invention can be produced by the method for producing a hollow body according to the present invention.
  • the hollow body according to the present invention and the method for producing the same are as follows: (A) A hollow body can be constructed without using celluloid, (B) There is no fitting seam, (C) The thickness of the hollow body can be managed with high accuracy. (D) The thickness can be made uniform in all parts, (E) Productivity is good, It is possible to obtain excellent effects such as.
  • FIG. 2 is a cross-sectional view taken along line II-II in FIG. It is sectional drawing which shows the male type
  • FIG. It is sectional drawing which shows the process of preforming a 1st half body in the said Example 1.
  • FIG. It is sectional drawing which shows the process of integrating a 1st half body and a 2nd half body in the said Example 1.
  • FIG. It is an expanded sectional view which expands and shows a part of FIG. It is sectional drawing which shows the completed hollow body in the said Example 1.
  • Example 7 It is sectional drawing which shows the male type
  • FIG. It is an expanded sectional view which expands and shows a part of FIG. It is sectional drawing which shows the completed hollow body in the said Example 7.
  • Example 8 of this invention before integrating a 1st half and a 2nd half, it is sectional drawing which shows the state which accommodated the liquid in the 1st half.
  • FIGS. 1 to 7 show Example 1 of the present invention for producing a hollow sphere that can be used as a table tennis ball or the like as a hollow body.
  • FIGS. 1 and 2 show a female mold 1 used in this embodiment, and one female mold 1 is provided with four hemispherical recesses 2. The openings 2 a of these recesses 2 are opened on the upper surface of the female mold 1. The periphery of the opening 2a of each recess 2 is surrounded by an annular projection 3 having a triangular cross section.
  • FIG. 3 shows a male die 4 in this embodiment, and four hemispherical convex portions 5 are formed in one male die 4 corresponding to the hemispherical concave portion 2 of the female die 1.
  • a 1,2-polybutadiene elastomer (trade name (registered trademark): JSR RB810, manufactured by JSR Corporation) is used as a thermoplastic elastomer that can be highly crosslinked by chemical crosslinking.
  • Various compounding agents were blended at various ratios.
  • JSR RB810 100 parts by weight Dicumyl peroxide (peroxide crosslinking agent) 1.8 parts by weight Inorganic filler (manufactured by Tosoh Silica Co., Ltd., trade name (registered trademark): nip seal ER) 5 parts by weight Stearic acid (processing aid) Agent) 0.5 part by weight Phenol-based anti-aging agent 0.5 part by weight Titanium white (colorant) 1 part by weight
  • the thermoplastic elastomer 6 is blended with the various compounding agents in the form of a sheet, the sheet is supplied onto the female mold 1 disposed below the male mold 4, and as shown in FIG.
  • thermoplastic elastomer 6 is sandwiched between 1 and a male mold 4 and is preliminarily molded in a compression molding format by applying pressure and heating at 90 ° C. for 60 seconds at a low temperature at which no crosslinking reaction occurs. As a result, four hollow hemispherical first halves 7 each having an opening 7a are obtained.
  • annular protrusion 3 is provided on the female die 1, and these annular protrusions 3 are brought into contact with the lower surface of the male die 4, so that the thermoplastic elastomer outside the recess 2 indicated by reference numeral 8. 6 is separated from the first half 7 in a flat state.
  • the second half body 9 having a hollow hemisphere shape having an opening 9a on one side (see FIGS. 5 and 6). ) Separately. Therefore, in the present embodiment, the first half 7 and the second half 9 are completely the same shape and size.
  • the second half 9 is preformed.
  • the first half 7 and the second half 9 are respectively formed. Separately, it may be preformed simultaneously in parallel.
  • the female mold 1 in which the first half 7 is accommodated and the female mold 1 in which the second half 9 is accommodated are opposed to each other.
  • the film is crosslinked by heating at a high temperature and 170 ° C. for 5 minutes.
  • the two halves 9 are integrated into a single hollow sphere-shaped hollow body 10 and the hollow body 10 has sufficient hardness.
  • FIG. 7 shows a hollow sphere-like hollow body 10 obtained by this process, and can be used as a table tennis ball or the like. If necessary, the outer surface of the hollow body 10 may be polished by blasting or the like. Even if the portion corresponding to the joint surface between the first half 7 and the second half 9 of the outer surface of the hollow body 10 after integration looks like a streak, the streaks are obtained by polishing. Can be made invisible.
  • the hollow body 10 can be formed without using celluloid (note that the thermoplastic elastomer 6 is crosslinked by being heated at a high temperature). As a result, it becomes a thermosetting resin.
  • first half 7 and the second half 9 are not fitted to each other, but are integrated by bridging in a state where the edges of the openings 7a and 9a face each other. There is no seam. Therefore, particularly when used as a ping-pong ball, it is possible to obtain an extremely excellent characteristic that the same way of bouncing whatever part hits the ping-pong table or racket.
  • the raw material is not attached to the inner surface of the mold in a liquid or molten state as in the case of rotational molding, the raw material is preformed in the state of an elastomer, so that the meat of the hollow body 10 finally obtained is Thickness can be managed with high accuracy.
  • the fitting seam is not generated, and the hollow body 10 is manufactured regardless of blow molding or vacuum forming. Therefore, the thickness of the entire hollow body 10 can be made uniform.
  • the hollow body 10 is manufactured without using rotational molding, the productivity is good.
  • the hardness of the finally obtained hollow body 10 can be adjusted by adjusting the amount of the crosslinking agent.
  • thermoplastic elastomer 6 is supplied between the female mold 1 and the male mold 4 in the form of a sheet at the preliminary molding stage.
  • thermoplastic elastomer 6 is in the form of blocks or pellets. It may be supplied between the female mold 1 and the male mold 4 in other states.
  • the female mold 1 and the male mold 4 are four-piece molds, but a larger number than four-piece molds may be used, or three or less molds may be used.
  • titanium white is used as a colorant in order to make the product, that is, the hollow body 10 finally obtained, white.
  • the product is to be orange, a red pigment and a yellow pigment are used instead.
  • the table tennis ball color is white or orange according to the rules of the International Table Tennis Federation).
  • a colorant whose product has a color other than white and orange can be used.
  • Example 1 when crosslinking is performed by heating at a high temperature in a state where the edge of the opening 7a of the first half 7 and the edge of the opening 9a of the second half 9 are abutted, The air in the space surrounded by the first half 7 and the second half 9 expands and the pressure increases, and the first half 7 and the second half 9 are pressed against the inner surface of the female mold 1.
  • the first half body 7 and the second half body 9 function so as to be satisfactorily joined. In this embodiment, the first half body 7 and the second half body 9 Is better bonded.
  • the first half positioned on the lower side before the edge of the opening 7a of the first half 7 and the edge of the opening 9a of the second half 9 are abutted.
  • the pyrolytic chemical foaming agent By placing the pyrolytic chemical foaming agent in the body 7, the pyrolytic chemical foaming agent is accommodated in the space formed between the first half 7 and the second half 9.
  • Other points are the same as in the first embodiment.
  • the foaming agent when the first and second halves 7 and 9 are heated to a high temperature in a state where the edges of the openings 7a and 9a are abutted with each other, the foaming agent generates gas.
  • the pressure in the space surrounded by the first half 7 and the second half 9 can be increased, and the first half 7 and the second half 9 can be pressed more strongly against the inner surface of the female mold 1. Therefore, the 1st half body 7 and the 2nd half body 9 can be joined more favorably and can be integrated.
  • thermoplastic elastomer that can be highly crosslinked by chemical crosslinking is blended with a polymer that can be crosslinked by chemical crosslinking but does not become as hard as the thermoplastic elastomer.
  • thermoplastic elastomer that can be highly crosslinked by chemical crosslinking the same 1,2-polybutadiene elastomer as in Examples 1 and 2 was used, and as the polymer blended therewith, a polyolefin thermoplastic elastomer (DuPont Dow elastomer) Product name (registered trademark): Engage 8150) manufactured by LLC was used. Next, a blending table of raw materials is shown.
  • JSR RB810 75 parts by weight Engage 8150 25 parts by weight Dicumyl peroxide (peroxide crosslinking agent) 3 parts by weight Stearic acid (processing aid) 0.5 parts by weight Phenolic anti-aging agent 0.5 parts by weight Red pigment (coloring) Agent) 0.6 part by weight Yellow pigment (colorant) 0.3 part by weight Except for the blending of the polyolefin-based thermoplastic elastomer, the production method, heating time, heating temperature, and the like are the same as in Example 1, and the mold used is the same as in Example 1.
  • a red pigment and a yellow pigment are blended as colorants in order to make the product (the hollow body 10 finally obtained) orange.
  • the blend of the polymers can more easily adjust the hardness of the finally obtained hollow body and can improve the strength of the finally obtained hollow body.
  • thermoplastic elastomer that can be highly crosslinked by chemical crosslinking
  • SBS styrene butadiene styrene block copolymer
  • Various compounding agents were blended at such ratios.
  • Clayton D-KX414 100 parts by weight Peroxide crosslinking agent (trade name (registered trademark): Park Mill D, manufactured by NOF Corporation) 1 part by weight Stearic acid (processing aid) 0.5 part by weight Phenolic antioxidant 0 .5 parts by weight Inorganic filler (manufactured by Tosoh Silica Co., Ltd., trade name (registered trademark): nip seal ER 10 parts by weight titanium white (colorant) 1 part by weight
  • the mold used was the same as in Example 1, the production process was the same as in Example 1, but the heating temperature in the preforming was 120 ° C., the heating time was 30 seconds, and the heating temperature in the crosslinking process was 170 ° C. The heating time was 5 minutes.
  • thermoplastic elastomer that can be highly crosslinked by chemical crosslinking is blended with a polymer that can be crosslinked by chemical crosslinking but does not become as hard as the thermoplastic elastomer.
  • the same styrene butadiene styrene block copolymer (SBS) as in Example 4 is used as the thermoplastic elastomer that can be highly crosslinked by chemical crosslinking, and the polymer blended with this is styrene / ethylene.
  • Butylene / styrene block copolymer (SEBS) (manufactured by Kraton Polymer Japan Co., Ltd., trade name (registered trademark): Kraton G-1652) was used. Next, a blending table of raw materials is shown.
  • Clayton D-KX414 80 parts by weight Clayton G-1652 20 parts by weight Peroxide crosslinking agent (trade name (registered trademark): Park Mill D-40, manufactured by NOF Corporation) 2 parts by weight Stearic acid (processing aid) 0. 5 parts by weight Phenolic anti-aging agent 0.5 part by weight Red pigment (colorant) 0.6 part by weight Yellow pigment (colorant) 0.3 part by weight Except for the point where SEBS was blended, the production method, heating time, heating temperature, etc. were the same as in Example 4, and the mold used was the same as in Example 4 (and therefore the same as in Example 1). It is.
  • the blend of the polymers can more easily adjust the hardness of the finally obtained hollow body, and can improve the strength of the finally obtained hollow body.
  • thermoplastic elastomer 6 blended with various compounding agents is supplied in the form of a sheet to the female mold 1 disposed below the male mold 4 and is shown in FIG.
  • thermoplastic elastomer 6 is sandwiched between the female mold 1 and the male mold 4 and preliminarily molded in a compression molding format by heating at a high heating temperature of 170 ° C. for 5 seconds.
  • the thermoplastic elastomer 6 is cross-linked, but in this example, the heating time is as short as 5 seconds, so it is not cross-linked. Therefore, as in the case of Example 1, the first half body 7 in the form of a hollow hemisphere having an opening 7a on one side is obtained by the preforming step.
  • the second half 9 is preformed at a heating temperature of 170 ° C. and a heating time of 5 seconds as in the preforming step of the first half 7. Also in this case, although the heating temperature is high, since the heating time is short, the crosslinking reaction does not occur, and an uncrosslinked hollow hemispherical second half 9 having an opening 9a on one side is obtained.
  • the second half 9 is preformed.
  • the first half 7 and the second half 9 are respectively formed. Separately, it may be preformed simultaneously in parallel.
  • the female mold 1 in which the first half 7 is accommodated and the female mold 1 in which the second half 9 is accommodated In a state where the edge of the opening 7a of the first half 7 and the edge of the opening 9a of the second half 9 are butted together, heated at 170 ° C. for 5 minutes to crosslink, The first half body 7 and the second half body 9 are integrated into a single hollow sphere-shaped hollow body 10, and the hollow body 10 has sufficient hardness.
  • the heating temperature in the preforming process of the first and second halves 7 and 9 is also high, it is not necessary to repeatedly cool or heat the female mold 1, so that the work is efficient. Will be able to do.
  • the heating temperature in the preforming step is set to a high temperature
  • the heating time can be set to a time when the crosslinking reaction is completed but the crosslinking is not completed.
  • the degree of cross-linking performed in the preforming step in this case is stopped so as not to hinder as much as possible in the next step of integrating the first half 7 and the second half 9.
  • thermoplastic elastomer in addition, as described above, the method of heating and pre-molding thermoplastic elastomer at a high heating temperature only for a short time in which crosslinking reaction does not occur or crosslinking is not completed is possible.
  • the present invention can also be applied to a case where a polymer that can be crosslinked by chemical crosslinking but is not as hard as the thermoplastic elastomer is blended with the plastic elastomer.
  • FIG. 8 shows a female die 11 used in the present embodiment, and one female die 11 is provided with four semi-rotary ellipsoidal concave portions 12.
  • the openings 12 a of these recesses 12 are open on the upper surface of the female mold 11.
  • the periphery of the opening 12a of each recess 12 is surrounded by a protruding portion 13 having a triangular cross section and forming an annular shape.
  • FIG. 9 shows a male mold 14 in the present embodiment, and four male spheroidal ellipsoidal projections 15 correspond to the semicircular ellipsoidal concave section 12 of the female mold 11. Is formed.
  • thermoplastic elastomer 6 blended with the same various compounding agents as in Example 1 is supplied on the female mold 11 in a sheet form, and as shown in FIG.
  • the thermoplastic elastomer 6 is sandwiched between the male mold 14 and the male mold 14 and is preliminarily molded in a compression molding format by applying pressure and heating at 90 ° C. for 60 seconds at a low temperature at which no crosslinking reaction occurs.
  • four hollow half-spheroid first half bodies 16 having openings 16a on one side are obtained.
  • a second half 9 is obtained separately.
  • the female mold 11 in which the first half 16 is accommodated and the female mold 1 in which the second half 9 is accommodated are opposed to each other.
  • the film is cross-linked by heating at a high temperature of 170 ° C. for 5 minutes.
  • the second half 9 is integrated into one hollow body 17, and the hollow body 17 has sufficient hardness.
  • FIG. 14 shows an eighth embodiment of the present invention.
  • the same first half 16 and second half 9 as in Example 7 are manufactured by the same steps as in Example 7.
  • the edge of the opening 16 a of the first half 16 and the edge of the opening 9 a of the second half 9 are butted together.
  • the edge of the opening 7a of the first half 7 And the edge of the opening 9a of the second half 9 are brought into contact with each other and heated and cross-linked in the same manner as in Example 7 so that the first half 16 and the second half 9 are integrated.
  • the liquid 18 is sealed in the completed hollow body 17.
  • the work for integrating the halves 16 and 9 is performed with the first half 16 facing downward and the second half 9 facing upward, before the integration.
  • the liquid 18 is contained in the first half 16
  • the two halves 9 and 16 are integrated with the second half 9 downward and the first half 16 upward.
  • the liquid 18 is accommodated in the second half 9 before the integration.
  • the liquid 18 is sealed in the hollow body 17, but an object such as a solid, powder, or granule may be sealed instead of the liquid 18 by the same process. Good.
  • the hollow body obtained by the present invention can be used as various balls for competition, toys or decoration, various floats, valve bodies, roll-on balls, containers, etc. It is not particularly limited.
  • the shapes of the first and second halves in the present invention are not limited to the shapes of the respective embodiments.
  • the completed hollow bodies 10 and 17 have a completely closed shape.
  • the completed hollow body communicates with the inside and outside of the hollow body. You may have a hole.
  • thermoplastic elastomer that can be highly crosslinked by chemical crosslinking
  • various materials to be blended with the thermoplastic elastomer that can be highly crosslinked by chemical crosslinking are not limited to those shown in each example, and the hollow material finally obtained according to the use. In order to adjust the characteristics of the body, it can be changed as appropriate.
  • the female mold used at the time of preliminary molding is used as it is at the time of crosslinking. It is more efficient to use the female mold used at the time of preforming as it is at the time of crosslinking as in the embodiment).
  • the present invention provides a hollow body used as various game balls such as table tennis balls, toy balls, decorative balls, various floats, valve bodies, roll-on balls, containers and the like, and a method for producing the same. Useful for.

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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)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

La présente invention concerne un corps creux et son procédé de fabrication, qui n'utilisent pas de celluloïd et avec lesquels des avantages tels que l'absence de formation d'un joint de raccord sont obtenus. Un élastomère thermoplastique, qui peut se réticuler à un degré élevé par réticulation chimique, est placé dans un moule et un agent de réticulation est ajouté. Après la préformation par mise sous pression et chauffage à une température et à un moment auxquels la réaction de réticulation ne se produit pas ou, si la réaction de réticulation se produit, la réticulation est incomplète, une première moitié (7) creuse dotée d'une ouverture (7a) sur un côté et une seconde moitié (9) creuse dotée d'une ouverture (9a) sur un côté sont obtenues chacune séparément. Ensuite, avec le bord de l'ouverture (7a) de la première moitié (7) venant buter contre le bord de l'ouverture (9a) de la seconde moitié (9) à l'intérieur des moules (1, 1), les moitiés sont chauffées à température élevée et réticulées pour unir la première moitié (7) à la seconde moitié (9) et pour former un corps creux (10), puis pour amener ledit corps creux (10) à posséder la dureté adéquate.
PCT/JP2014/071144 2013-09-02 2014-08-11 Corps creux et son procédé de fabrication WO2015029761A1 (fr)

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