Method for folding film edges
Pre-stretched films may be used to increase the rate at which loads can be wrapped and to minimize the exertion required when using traditional handheld film. However, the edges of pre-stretched films are easily damaged, which may result in tearing or failure of the film during use. The present disclosure describes devices, systems, and methods for folding the edges of the film, resulting in a film that is less susceptible to damage and easier to use.
1. A method for producing folded edges in a film in-process, the method comprising the steps of
providing a film section with edges created by longitudinal slits;
providing a first idler roll;
providing a second idler roll separated from the first idler roll by a first distance;
providing a plurality of folding guides that are positioned between the first idler roll and the second idler roll;
moving the film section over the first idler roll;
moving the film section past the folding guides, wherein each folding guide separates adjacent sections of film and induces two folds by causing an edge of each section of film to turn under 180° and spontaneously cling to a bottom surface of the film; and
moving the film section over the second idler roll.
2. The method according to claim 1 , wherein the folding guide is a folding rod.
3. The method according to claim 2 , wherein the folding rod varies from ⅜ inch to 1 inch in diameter.
4. The method according to claim 3 , wherein the folding rod is approximately 11/16 inch in diameter.
5. The method according to claim 1 , wherein the folding guide is positioned between the first idler roll and the second idler roll at a guide distance and a guide angle.
6. The method according to claim 5 , wherein the guide distance is approximately ⅔ of the first distance.
7. The method according to claim 5 , wherein the guide angle is an acute angle between the film and the folding rods, measured with the folding rods leaning toward the first idler roll.
8. The method according to claim 7 , wherein the guide angle varies from 20° to 90°.
9. The method according to claim 8 , wherein the guide angle is approximately 45°.
10. The method according to claim 1 , wherein the film passes through a nip roll assembly after the second idler roll.
11. The method according to claim 1 , wherein the folding guide is comprised of a material selected from a group consisting of steel, aluminum, and nylon.