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DHS D40+ to Be Released in April

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qpskfec View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote qpskfec Quote  Post ReplyReply Direct Link To This Post Posted: 10/11/2017 at 2:17pm
Originally posted by Baal Baal wrote:

[QUOTE=qpskfec]Given the resources of DHS, they would have prototyped many raw material process and ball configurations when developing the D40+.

For comparison, Nittaku was just granted US Patent #9623288 on its ABS ball in Apr 2017. If you scan through it, it is clear they spent a lot of time in R&D.

This chart in the patent shows balls with varying wall thickness versus results for bounce, sound, and strength. There are many charts like this in the patent. DHS would have done many of the same comparisons.



I recall too that one of the things they patented before was the process for sealing the two halves together in a way that gives that very thin seam.


I did not find any Nittaku patent for joining halves together. In the above patent, it states that the ABS ball halves can be joined together the same way as the cell ball.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Baal Quote  Post ReplyReply Direct Link To This Post Posted: 10/11/2017 at 2:34pm
Originally posted by qpskfec qpskfec wrote:

Originally posted by Baal Baal wrote:

[QUOTE=qpskfec]Given the resources of DHS, they would have prototyped many raw material process and ball configurations when developing the D40+.

For comparison, Nittaku was just granted US Patent #9623288 on its ABS ball in Apr 2017. If you scan through it, it is clear they spent a lot of time in R&D.

This chart in the patent shows balls with varying wall thickness versus results for bounce, sound, and strength. There are many charts like this in the patent. DHS would have done many of the same comparisons.



I recall too that one of the things they patented before was the process for sealing the two halves together in a way that gives that very thin seam.


I did not find any Nittaku patent for joining halves together. In the above patent, it states that the ABS ball halves can be joined together the same way as the cell ball.


It was awhile ago.  Zeio posted a link to it a couple of years ago I think.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote icontek Quote  Post ReplyReply Direct Link To This Post Posted: 10/11/2017 at 9:48pm
Originally posted by igorponger igorponger wrote:

Once you're about to tame the beast you must know its every habit and twist...

Those brave Japanese did a comprehensive studies of the vicious Plastic Beast

by Yuki Inaba p.37
© Editorial Committee of Journal of Human Kinetics

Conclusion
    Changes between the trajectory of
    celluloid balls, which had been long used in table
    tennis, and newly introduced plastic balls were
    investigated in this study.

    Plastic balls demonstrated a higher coefficient of restitution
    than celluloid balls when the initial vertical
    velocities were higher. Moreover, the coefficient
    of friction was higher for plastic balls when the
    initial horizontal contact point velocities were
    lower.
    As a result, for slower balls with back-spin,
    as in the case of a service, plastic balls are
    expected to experience more deceleration upon
    collision with the table than celluloid balls. On the
    other hand, for faster balls with greater amounts
    of top-spin, plastic balls are expected to
    experience greater acceleration upon collision
    with the table than celluloid balls.


When they say "plastic balls", what do they mean?

Cellulose Acetate?
Poly?
ABS?
And are they describing the ones with a seam or without?



US1260.RC952 . Yasaka Gatien Extra : Target National + Rasant
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Baal Quote  Post ReplyReply Direct Link To This Post Posted: 10/11/2017 at 11:07pm
See my post above. ABS. Tbey compared Nittaku Premiums in celluloid and ABS versions.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote igorponger Quote  Post ReplyReply Direct Link To This Post Posted: 10/14/2017 at 3:55pm
ABS plastic a ductile material?

I've heared an interesting thing about the new plastic material, a top player reported they have got to swop DF V40 balls (ABS plastic) after two or three matches played as the balls have lost round shape a little, and they got wobbling.    It is some vexing problem, anyway.
     
Is the inelastic deformation inherent to all plastic balls ? Report your case here, please.

Edited by igorponger - 10/14/2017 at 4:02pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote icontek Quote  Post ReplyReply Direct Link To This Post Posted: 10/14/2017 at 11:39pm
Originally posted by Baal Baal wrote:

See my post above. ABS. Tbey compared Nittaku Premiums in celluloid and ABS versions.

if it was from a couple years ago, wouldn't it be a nittaku premium in poly (not abs)?

Are nittaku premiums now abs?

(poly and abs are different plastics)
US1260.RC952 . Yasaka Gatien Extra : Target National + Rasant
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Baal Quote  Post ReplyReply Direct Link To This Post Posted: 10/15/2017 at 12:32am
It's a recent paper (Jan 2017) and the Nittaku ABS version was sold by 2015.

Actually the Nittaku Premium 40+ has been ABS since they were introduced. The Nittaku SHA is a 40+ ball introduced about a year earlier. It is a cellulose acetate ball, actually a relabeled DHS. But they never called a cellulose acetate ball "premium".

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