Method and systems for applying stretch films/plastic films at a controlled temperature and/or transfer of electrostatic charge
A system for controlling the temperature of a film before and/or during application, the system including: a heat source for heating a film; and stretch rollers; wherein the heat source heats the film from an ambient temperature to a temperature from about 2° C. to about 40° C. above the ambient temperature, wherein the film is heated prior to or simultaneous to being stretched by the stretch rollers, and wherein the ambient temperature is below 15° C. A system for improving the application of film by transfer of electrostatic charge is also described. The preheating system and/or electrostatic charge system may be used to enhance binding and sealing properties of stretch films used for wrapping palletized products in a reduced temperature environment. Other embodiments of the preheating film system and electrostatic charge system, and methods for their use, are described herein.
1. A system for enhancing adherence of a film before and/or during application of the film to a product, the system comprising:
an electrostatic source for charging a film; and
stretch rollers for stretching the film;
wherein the electrostatic source emits an electrostatic charge to the film, and
wherein the film is charged prior to or simultaneous to being stretched by the stretch rollers.
2. The system of claim 1 , wherein the electrostatic source is located on a film carriage head.
3. The system of claim 1 , wherein the electrostatic source emits a positive charge, a negative charge, or alternates between a positive charge and a negative charge.
4. The system of claim 2 , wherein the system further comprises a first film carriage head and a second film carriage head, wherein the first film carriage head comprises a positive electrostatic source and the second film carriage head comprises a negative electrostatic source.
5. The system of claim 1 , wherein the electrostatic source emits an output from about 0.1 mA to about 0.9 mA.
6. The system of claim 1 , wherein the electrostatic source emits a voltage from about 50 mV to about 200 mV.
7. The system of claim 1 , wherein an operating distance of the electrostatic source is from about 5 mm to about 250 mm from the film.
8. The system of claim 1 , wherein an ambient temperature is from about −5° to about 15° C.
9. The system of claim 1 , wherein the electrostatic source emits the electrostatic charge to at least one of a separate top sheet and a separate bottom sheet.
10. The system of claim 1 , wherein the electrostatic charge activates functional additives incorporated into the film that improve film characteristics of binding, sealing, sanitizing, or atmosphere treatment effectiveness.
11. The system of claim 10 , wherein the functional additives incorporated into the film are cling agents or sanitizing agents.
12. A system for enhancing adherence of a film before and/or during application of the film to a product, the system comprising: an electrostatic source for charging a film; and a stretch hooder for forming a bag from the film; wherein the electrostatic source emits an electrostatic charge to the film prior to or simultaneous to being formed, cut, or stretched.
13. The system of claim 12 , wherein the electrostatic source is located on the stretch hooder.
14. The system of claim 12 , wherein the electrostatic source emits a positive charge, a negative charge, or alternates between a positive charge and a negative charge.
15. The system of claim 12 , wherein the electrostatic source emits an output from about 0.1 mA to about 0.9 mA.
16. The system of claim 12 , wherein the electrostatic source emits a voltage from about 50 mV to about 200 mV.
17. The system of claim 12 , wherein an operating distance of the electrostatic source is from about 5 mm to about 250 mm from the film.
18. The system of claim 12 , wherein an ambient temperature is from about−5° to about 15° C.
19. The system of claim 12 , wherein the electrostatic source emits the electrostatic charge to a separate bottom sheet.
20. The system of claim 12 , wherein the electrostatic charge activates functional additives incorporated into the film that improve film characteristics of binding, sealing, sanitizing, or atmosphere treatment effectiveness.
21. The system of claim 20 , wherein the functional additives incorporated into the film are cling agents or sanitizing agents.