Hard set the width attribute when you define the table cell...
<TD width="300">Your Text Dump</TD>
Or the better way for future forward compatibility is to define the cell's attributes in CSS to hard set the width.
Your CSS would go something like this:
TD.textdump {
width: 300px;
}
and your HTML would go something like this:
<TD class="textdump">Your Text Dump</TD>