Kraft paper, for cylinder shell cases.!

[TheGandalf]

Hello Out there.

What kind of kraft paper do you use to make cylinder cases with?

40g?

70g ..

// Gandalf

[nater]

30 lb and 60-70 lb Virgin kraft.

[mikeee]

Virgin, if you can find it. You want a good quality paper that has strong fibers that won't won't fall apart when wet.

You also want several weights of paper, Fulcanelli articles are a good resource for the weights needed for different

sizes shells. You can substitute other weights but you will need to add several layers when going to a lighter weight

paper.

[Fulmen]

For tubes I prefer 100g virgin kraft, the heavier paper means less rolling. For pasting I use 60g kraft.

[memo]

I use 30# and 70# virgin craft... be sure that it is virgin craft it makes a big difference.

 

memo

[schroedinger]

For cylinders 70 g/m^2 is ~50lb. 100 g is ~67 lb. The 70 g works very good with wet rolled casings and dry ones. But you sometimes need a turn more then recommenden by fulcanelly.

[Arthur]

The Maltese reuse cement bags!

 

It's a matter of price, availability and shell design

[Mia]

Normally animal feed bags Arthur there donated by the farmers to the cause.

[memo]

are the feed bags made from craft ? cement bags ?

 

memo

[mikeee]

Most large kraft paper bags are made of stronger heavier grades of paper to stand up to the

weight of the content of the bags. You can use a micrometer to measure the thickness of the paper

and give it a value based on your own test results. You will need to adjust the number of layers based

on each type of bag used and the thickness and strength it provides.

[Col]

heavy sacks are usually made with extensible kraft, which has a higher percentage of stretch.

[dynomike1]

This should answer most questions.

http://www.skylighter.com/fireworks/help/shell_building_charts_and_tables.asp#paper

http://www.skylighter.com/fireworks/help/kraft_paper_weights_and_thickness.asp

[TheGandalf]

Thanks for all the usefull answers!