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| DYMAX |
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Description Fast cure times of light cure doming resins mean greater productivity and less inventory. Light cure allows for the elimination of ovens, which will save manufacturing space while recovering high energy costs. UV curable dome coating and decorative coatings are solvent free and do not contain toxic mercury or isocyanates.
Features
Selecting the Right UV Lamp
Process Tips for Successful Coating Avoid resin running over the edge of the label or object 1) Resin is deposited at the center of the label or object and flows towards the edges. Sharp edges tend to repel overflow. Irregular edges encourage overflow. Thick label stock tends to maintain its edge and minimise overflow. 2) Label backing can minimise or encourage overflow. If the backing material "wets" more readily than the label surface, it tends to draw the coating over. Using a backing that repels the resin encourages it to remain on the label. 3) Use an X-Y dispenser to dispense a pattern instead o a single drop on non circular objects. Pattern dispensing lets the resin flow to all the edges at the same time rather than all running to one edge where it can flow over before reaching the remaining edges. 4) Level the dispenser, transfer and curing stations. Avoid air bubbles in the coating 1) Purchase products in air free packages (syringes or cartridges). 2) Dispense directly from the shipping container. If resin must be transferred from one container to another, then transfer the container at the end of the last shift. 3) Use low pressure dispensing. Since pressure drops can pull air into the dispensing line, dispense with the lowest pressure possible. 4) Use the shortest possible lines between the container and the dispensing needle. 5) Pass the uncured (liquid) coating underneath a natural gas flame to burst surface bubbles. 6) Process by continuous dispensing and purge tip when restarting line. Whenever fluid flow stops completely, the resin may retract. When resin retracts it can pull air into the line or dispensing tip. The air can create bubbles before it is purged from the line. Eliminate warpage during cure 1) Some thermoplastics curl or warp when hot. Use a thermoplastic with a higher melting point or reinforcement to solve this problem. Using a thicker substrate may also eliminate warpage. 2) To eliminate curl when doming on thin polyester labels try pre-curing with a "black" light. The "black" light should have a maximum intensity at 365 nm. Regular purple colored bulbs or germicidal bulbs will not work. The pre-curing polymerises the coating below the coating's surface. A second lamp is then used to cure the surface to a scratch resistant state. As the label gets larger, softer resins are necessary to prevent warpage. 3) Use of thicker polyester stock to stiffer backing sheets minimizes curl of domed decals. Other Information
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May 2012 |
![]() INTERTRONICS 17 Station Field Industrial Estate, Banbury Road KIDLINGTON, Oxfordshire, OX5 1JD, ENGLAND t +44 1865 842842 e info@intertronics.co.uk |
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| Statements, technical information and recommendations
contained herein are based on tests we believe to be reliable but
they are not to be construed in any manner as warrantees expressed
or implied. The user shall determine the suitability of the product
for his intended use and the user assumes all risk and liability
whatsoever in connection therewith.
© INTERTRONICS 1997, 2012 |
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