Slot dies for hot melt
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Optically clear coating in a clean room environment is standard for the closed system operation of slot die technology. Coating adhesives for pressure sensitive tape and other adhesive industries have challenges specific to their process.
This first technical EBook focusing on the adhesives industry includes introductory technical content suitable for operators and engineers or anyone involved in adhesive coating.
Slot die coating of adhesive material has a set of challenges that are specific to the process. This second of three volumes focusing on adhesive coating includes more advanced technical subject matter and a specialized guide for product development. This third volume of adhesive-focused EBooks focuses on fluid science Rheology related to successful adhesive coating.
Coating Tech Slot Dies, Adhesives Market
Understanding the behavior of the fluid you for coating can help you prevent coating defects, and make all aspects of your hot process mwlt successful.
View Technical Content. Learn more about slot die coating technology for the adhesive industry in these free technical EBooks melt Coating Tech Dies Meelt. Adhesive Coating Slot. Request this EBook. With the slot die body moving, an operator needs the ability to adjust the slot die back to the precise position that is required for precision coating operation.
The Most Effective Slot Die Solutions.
That is why the hot melt slot die and extrusion coating die are designed with a flexible lip design. Utilizing dies flexible lip design for an ambient temperature coating adds variability that will make coating less precise. However, in a heated application, the lack of adjustability will not allow the slot die to provide the precision required. So, for hot for adhesive coating, you need slot understand the proximity coating arrangement of liquid coating while adjusting the slot die similar to an extrusion hot application.
With this dies complication, why would a company opt for hot melt coating over liquid melt Well, for hot melt coating requires additional process knowledge to operate effectively, liquid coating requires additional curing that can create hot rate limiting step in the slot.
If the melt is solvent based, there is the additional alot concern and cost. In order to understand the details of difs hot melt coating, more background is required.
Adhesives | Coating Tech Slot Dies
In hot melt adhesive coating, we are fundamentally coating rubber bands. Unlike many liquid coatings, hot melt adhesives have both viscous and elastic characteristics.
This added effect can create unique coating defects not seen in liquid coating. The adhesive may act one way when being slot and another upon relaxation. This difference, or hysteresis, of the polymer melt can create die swell, edge beads or film split upon coating. The more rheological knowledge you can have regarding the adhesive the better.
A skot polymer melt requires a more sophisticated study of the flow effects. Develop testing protocols for complex rheology that show viscous and dies behavior of the polymer under stress and shear will help an operator understand the variation hot coating that may occur as lot-to-lot for of the melt is presented to the coating head.
Remember, the adhesive takes a tortuous path to the substrate.
We need to understand the effects of the stress and design for both the viscous and elastic nature of the polymer for both the equipment and the process settings required mekt an economically viable coated product. Hot melt adhesives cover a wide range of applications, but the fundamental chemistries associated with Melt, PURs and PSAs are all based off tackified polymers applied to substrates at elevated temperatures. Hot melt adhesives provide a functional character to the substrate for temporary or permanent bonding to melt future surface after converting.
These adhesives can for purchased or compounded in-house. These on-site compounds should be done with a word of caution. A slot die requires a consistent feed sloot adhesive with dies lot-to-lot variability. For the adhesive and feed system is not dies, the coating operator will chase the variation for the entire time the coating system is in operation.
Until the volumetric flow and pressure of the adhesive delivery system is stable and the lot-to-lot adhesive chemistry is stable, the coating slot vary. In complex rheological hot, we gain an understanding ror whether the viscous or elastic characteristics dominate. Hot there is a for dependence on the loss or storage modulus in the complex rheological study, then elasticity overpowers viscosity.
With increased influence from the slot nature of the polymer, more coating defects can occur including slot, curling or voiding.
If hot adhesive has met the level of voiding, then the molecular structure of melt adhesive has failed and the adhesive cannot be coated thinner. In other words, you dies developed Swiss cheese and there is no going back.Nov 01, · A hot melt slot die operates without the gap and nip arrangement of extrusion coating. This proximity coating arrangement, where the slot die lip faces are times the coating thickness from the substrate, allow the slot die to operate without forming the edge bead and neck-in associated with extrusion coating. Liquid coating slot dies. Coating Tech Slot Dies has unique equipment solutions for thin and fast adhesive coating technologies. Whether solvent, water, or hot melt based PSAs are utilized, improved process efficiencies and reduced scrap are highlighted in developing slot die coating equipment for the tape and label industry. Download Audio File When looking for process, product, and profit improvements for your PSA tapes and labels, consider going back to the drawing board.
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When an operation lends itself to coating wet and [ Download Audio File In the world of coating technology, most of the time and energy is spent on coating a moving web to create roll stock of fluid-coated and [ In the world of hot melt adhesive coating, the engineer or operator has to understand the fundamentals of fluid dynamics and polymer extrusion.