CELLOGLAZING SPECIFICATIONS
(Pre Coat Thermally Activated Process/Adhesive Laminating)
Minimum Sheet Size
Pre Coat – 150mm x 200mm. We will grip on the 150mm edge
Adhesive – 280mm x 300mm. We will grip on the 300mm edge
Maximum Sheet Size
1020mm x 1280mm
Sheet over 1020mm wide will always be gripped to the short edge.
Film Types Available
Gloss – Standard, Glueable Gloss (also scuff resistant),
Digital , Biodegradable
Matt – Standard, Scuff Resistant (also glueable), Soft Touch (velvet), Digital Silver Metalised, Standard Gloss, Holographic, Soft Touch.
Grip Required
Minimum of 10mm on all four sides of job. This being from the finished size of the artwork to the edge of the sheet.
Coverage
Sheet will be covered in their entirety save for grip and side allowances.
Cuts
Where different cuts are present we will run cut for cut as delivered to us.
Kinds
Where different kinds are present in the job, we will run kind for kind as delivered to us. Please supply all mixed kind jobs uncollated.
Numbered Jobs
Please advise when booking in jobs and on orders.
Curing Time
We recommend heavy ink jobs are not embossed or scored within 24 hours of celloglazing.
Foiling
We can celloglaze either before or after this process for gloss celloglazing, however for matt celloglazing we must celloglaze prior to the foiling. It is worthwhile letting your stamping house know the foiling is going onto celloglaze, as they should use a foil which is compatible with celloglaze.
Embossing
Please advise when booking in jobs and on orders, if jobs are to be embossed after celloglazing. We recommend heavy ink jobs are not embossed or scored within 24 hours of celloglazing.
Book Covers
Where book covers are being ‘perfectly’ bound, the glue used in this process won’t adhere to the cello. We can single side cello or double side cello and leave a gusset for the binding in the center of the inside cover.
Gluing
a) Standard Cello – gloss or matt, use double tape or hot melt glue.
b) Glueable Cello – is machine gluable. Please specify on your order if this film is required. Also please check with your gluing house.
c) If a glue flap/s are to be left clear of cello this must be specified on the order. Supply a sample sheet to us as a guide. On this sample please show all score and cut lines. Please note: We will always run the cello 3mm over the score line into the glue flap. This will ensure cello doesn’t peel back when score is folded.
Compatibility
All celloglazing film used by Rotoflex is of food grade.
De-Dusting
This is not required for our process unless excessive amounts of powder have been used.
Colour Change
Our celloglazing won’t yellow over time like UV varnish, or be subject to chemical reactions with inks, as in the case of wet laminating. Our film generally will not change the colour of the job. There is however always some slight change in any colour once film is laid over it. Gloss film will intensify the colours. matt film will flatten the colour slightly. Should you require test samples for you customers approval, we can arrange these for you.
Marking of Film
Please be aware that while cello is quite robust, it can still be scuffed. Any matt cello jobs should be handled very carefully as it is by its nature more prone to scratching similar to matt board.
Stipple
Please be aware when celloglazing over a printed stipple the film placed over this will magnify the stipple. In cases where the stipple is red this will bring the red up and intensify the colour. To check if this will effect you, we can either run a sample for you, or you can check this for your self by placing sticky tape over print.
Quantities & Overs
Please list your total number of sheets you require to be celloglazed on your orders. We will run this quantity only. (eg: 1000 plus all or 1000 plus 100 overs) all sheets requested on order will be run and charged for. No allowances for overs is made.
Pressure Sensitive
Can be celloglazed. It is important to ensure that the job is properly dry before we celloglaze.
Paper Stocks
Minimum weight coated stock is preferably 130gsm (eg: Gloss Art), However uncoated stock can be lighter. Should you have need for use of lighter stock, please contact our staff for further consultation. We would also ask an extra tolerance for overs be allowed for the paper weight jobs.
DIGITAL PRINT & CELLOGLAZING
Due to our superior equipment expertise most digital work can be done with regular cello film.
However for the small percentage of work which requires it, we keep a digital specific film for those jobs which require the modified adhesive.
Personalised , Collated and other variable data work, can all be done. Conditions apply.
WINDOW FACE CELLOGLAZING
Minimum Size – 325mm x 455mm. We will grip to 455mm edge.
Maximum Size – 720mm x 1020mm. Sheet over 720mm wide we will always grip to the short edge.
Board Stock – Minimum thickness stock is 350mm.
Window Sizes – Maximum 100mm x 100mm. As the window will distort the sheet and there must be enough border to support the window, a larger window would be subject to trial to see if successful.
Other specifications are as per standard celloglazing information
PRE-COAT + ADHESIVE LAMINATION (CELLOGLAZING)
The Differences – Both processes use the same surface material ie. 12 & 18 Micron Bopp film. This is where the similarities start and end. Pre-coat film is the same surface material. Extrusion coated at the mill, with a thick (12 to 15 micron) coating of thermally activated adhesive. This is the top of the range method.
Adhesive Laminating – The same surface film is roller coated on the laminating machine with a water based adhesive. It can only attain a fraction of the coating weight of the premium product.
With the glue comes the chemistry and associated problems. The main one being colour change with Fenal pigments in certain inks. Usually associated with violets – rhodamine reds and reflex blue, or mixed colour containing a percentage of one of these.
We are not aware of standard process inks ever being effected, and with the use of colour stable inks for special colours, there should not be the potential for this problem. (Refer to your ink supplier).
On a smooth surface stock, the end results make it difficult to determine the process used. However, as the stock surface becomes more course, the added coating weight of adhesive on the pre-coat becomes evident.