Leonightiz
Member
Hi All… I work for a company that makes bags. Operators of the machines that make the bags need to take the bags from a cardboard box that the bags fall into as one long line of bags (between 350-4,000 bags/per lane. Each machine can have 1-8 lanes of bags. Each bag can be 1” wide to 20” wide.
Many times the customer will ask for these bags to be rolled onto a cardboard core which is about 3” in diameter. So, the box of bags will be on a table and few feet away is a “rewinder” machine that the operator threads between three rollers and then directly to a core with a side plate to divide each lane. Each “rewind” machine has a manual level to increase/decrease speed and pressure (from the front with pads that guide the bags).
The bag thicknesses vary but only have a few thicknesses: .0015”, .002”, .0025”, .003”, and .004”. It seems that the thicker .004” bags rewind pretty easily at whatever the speed and pressure is, but the lighter ones vary dramatically. There seems to be no set numbers to make use to make this process easy to do. It is obvious that the lighter the bags are, the easier it is for them to want to bounce up and down in the air make them hard to stay straight without going very slow, like 8-18 feet per minute. I would like to get them to go at least 25 feet per minute if possible, to free up time so they can work on the other packaging while it is running and not have to babysit this machine. I have noticed that a lot of times when the Rewinder is running okay, it’s seems like the speed is 2-3 times the pressure or vice-versa. Hopefully, I have explained this well enough for some input. Is there a formula for this? Something based on size and thickness of the bag type that I can figure out the best speed and pressure? The rolls are to be tight when done, but at the same time, the pressure can’t be too high or it has problems either tearing the bags apart where they connect or it simply is so tight it bunches the bag up and won’t keep them flat to roll nicely. Any ideas or help would be greatly appreciated. Thank you in advance.
Many times the customer will ask for these bags to be rolled onto a cardboard core which is about 3” in diameter. So, the box of bags will be on a table and few feet away is a “rewinder” machine that the operator threads between three rollers and then directly to a core with a side plate to divide each lane. Each “rewind” machine has a manual level to increase/decrease speed and pressure (from the front with pads that guide the bags).
The bag thicknesses vary but only have a few thicknesses: .0015”, .002”, .0025”, .003”, and .004”. It seems that the thicker .004” bags rewind pretty easily at whatever the speed and pressure is, but the lighter ones vary dramatically. There seems to be no set numbers to make use to make this process easy to do. It is obvious that the lighter the bags are, the easier it is for them to want to bounce up and down in the air make them hard to stay straight without going very slow, like 8-18 feet per minute. I would like to get them to go at least 25 feet per minute if possible, to free up time so they can work on the other packaging while it is running and not have to babysit this machine. I have noticed that a lot of times when the Rewinder is running okay, it’s seems like the speed is 2-3 times the pressure or vice-versa. Hopefully, I have explained this well enough for some input. Is there a formula for this? Something based on size and thickness of the bag type that I can figure out the best speed and pressure? The rolls are to be tight when done, but at the same time, the pressure can’t be too high or it has problems either tearing the bags apart where they connect or it simply is so tight it bunches the bag up and won’t keep them flat to roll nicely. Any ideas or help would be greatly appreciated. Thank you in advance.