[tex-live] rotating column conent of a twocolumn document

[hw]

Am 17.06.2015 um 20:05 schrieb Ulrike Fischer:
> Am Wed, 17 Jun 2015 19:36:13 +0200 schrieb hw:
>
>>> Why are you using twocolumn mode when you actually want the text in
>>> the second column simply below the text from the first column?
>
>> That's because there are two labels side by side spooled up on a big
>> roll from which they are being fed into the printer.
> ....
>
> I don't understand your description. But imho you are wrong. If you
> can put your data side-by-side in two column you can also put them
> one below the other.

If I print the labels below one another, they are still not printed 
sideways.

To print them sideways below one another, I would have to physically 
rotate the material which is printed on by 90 degrees, which, 
unfortunately, is not possible.

The stripe of labels is like this:


-----------------
|      | |      |   ^
| L1   | | L2   |   |
|      | |      |   |
|      | |      |   direction of feed
|      | |      |
|      | |      |
-----------------
|      | |      |
| L3   | | L4   |
|      | |      |
|      | |      |
|      | |      |
|      | |      |
-----------------
         ^ gap between 2 labels


How do you get them printed sideways by printing them one below the other?