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banding and images getting bigger
I am trying to print dome display boards on my 640, onto 440 miron PVC. Got the profile off rolands web site, but keep getting banding. Calibrated it, and it still happens. Loaded some into the plotter to cut them, and they’re about 1inch longer!
Printed using a pick up, and after speaking with roland unravelled a length of pvc off the roll. Still can’t get it right!
Anyone have any more ideas?
Printing on 1550 mm pvc, each board should be 606 x 900mm
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7 Replies
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there might be a calibration value in the profile that is over riding your input.
when i calibrate for length when doing build drawings i don’t care about the quality.
when i calibrate for quality i don’t care about the length. so never checked.
my guess is about +.50% calibration for 440 material -
What’s the best way to calibrate to lengrh?
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Chris is right. There’s a calibration issue you have. Sounds like your printer is feeding the media too quickly. Should be a setting in your menu somewhere? Our gs 6000 had the same prob but luckily while the engineer was setting up!! Sorry i couldn’t be of more help mate 😳 Hope you get it sorted.
Matt
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Found the setting in the profile to slow media speed and print head speed down. Not sure what effect these will have??????
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adjusting speed will not affect it its the feed amount that’s needs adjusting.
if you say its 25mm longer than the 900mm sent then i think its set the calibration to -2.5 % if it goes that high.
but it just all don’t sound right.
i normally only have to worry about 3mm in 1000. when printing on to 90gsm paper. -
Firstly sorry for the short blunt posts, as I was using my Blackberry, and it aint to great for posting on here.
The PVC is quite weighty, so I can understand it pulling a lot. I might try and move the bench infront of the printer to see if stopping the print hanging helps?
I will adjust the feed also, and keep you posted.
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Been doing some maths this morning.
Printed the board with the feed cal set to 2.5% as suggested, and took a measurement. I then changed it to 1.5% and measured again. The difference will give me the distance 1% equals.
From that I can work out what distance 0.01% is, and calculate the correct % to get the correct length.
I will let you know if it has worked!
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