Title:
HOLLOW BALL MADE OF POLYVINYL CHLORIDE
Document Type and Number:
Japanese Patent JP2016146937
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a hollow ball made of polyvinyl chloride which is lighter and softer than a conventional one.SOLUTION: A hollow ball made of polyvinyl chloride formed by applying rotary motion to polyvinyl chloride sol and by simultaneously heating it has a constitution in which a ball wall thickness is 0.2 cm or less, and a ball weight w(g) and a ball diameter d(cm) satisfy the relation of formula 1: w/d≤0.4 g/cm...(formula 1).SELECTED DRAWING: None
Inventors:
TOYODA HIROSHI
ONDA KOKI
TAKAHASHI KIMIE
SUZUKI TAKASHI
ONDA KOKI
TAKAHASHI KIMIE
SUZUKI TAKASHI
Application Number:
JP2015025363A
Publication Date:
August 18, 2016
Filing Date:
February 12, 2015
Export Citation:
Assignee:
TOYODA HIROSHI
GUNMA PREFECTURE
GUNMA PREFECTURE
International Classes:
A63B39/00
Domestic Patent References:
| JPS4945662U | 1974-04-22 | |||
| JPS5097550U | 1975-08-14 | |||
| JPS5573510A | 1980-06-03 |
Foreign References:
| US20120108372A1 | 2012-05-03 |
Other References:
”ＶＯＬＬＥＹＢＡＬＬ バレーボール”，［ONLINE］, JPN6018035086, 19 September 2011 (2011-09-19)
Attorney, Agent or Firm:
Kihei Watanabe
Okano Isao
Tetsuya Imai
Okano Isao
Tetsuya Imai