Many thanks Desislava. That solves my problem adding .igx-grid_td spane in my style.css file

/* You can add global styles to this file, and also import other style files */
@import url('https://fonts.googleapis.com/icon?family=Material+Icons');
.igx-grid__td span {
  white-space: nowrap;
  text-overflow: ellipsis;
  overflow: hidden;
}

I was needed the same things. 

I would like to tell it's a very nice sample. it helps me a lot.

I think some part of this sample could be added to the demo.

Good work.