Script for drawing dxf file in illustrator.............

Hello Friends.

I have a dxf file exported from CAD.

I have own script (JS file ) for loading this dxf file in illustrator.

By using this script I am able to load this dxf in illustrator , and it's showing good.

This file contains the Internals in CAD and dxf also .

But these Internals showing in Illustrator with close contours , It should be open not closed .

I am demonstrating the image below , It will help you to understood.

so Please guide me what will the proper script for left these close contours of Internal.

Please  assist me here.