In the spreadsheet app itself, you have the options to print only a specific sheet. You also can turn off the grid lines when creating the pdf from within the app. Is ther
When you choose export to pdf, you get a messagebox with options. In the right side of this messagebox there are five checkboxes. Check the second one, then you will hide the gridlines in the export. I don't know the label of this checkbox, because I use another language than english.
Good luck!
- Robert