EVA hot melts versus PUR hot melts

Posted on March 17th, 2016 by Greg Brown

So what is the difference between EVA hot melts and PUR hot melts anyway? In the simplest form, EVA’s can be used in open application dispensing systems while PUR’s require closed systems. Both do a great job in an adhering various substrates but use different routes in regards to how they can be applied.

EVA Hot Melt

You’ve likely seen an EVA (Ethyl Vinyl Acetate). It’s outgoing, an extrovert – it likes to be seen in all its forms: glue sticks, beads, pearls, chips, chicklets, slats, squares, pillows, slugs, chubs, yellow, white, colorless, opaque, translucent, small cartons, medium sized bags, large gaylord containers. You get to look at it, feel it, smell it (if you want), select it out of a catalog: do you want short open time, long open time, more tack, less tack, high heat resistance, high performance, general purpose, more porous substrates, more difficult material, 250F, 275F, 300F, 325F, 350F? It forms a bond by hot tack and completes the bond as it cools down to ambient temperature. It is a hot melt that meets a wide range of bonding application demands such as graphic arts, packaging, and general assembly work.

EVA Hot Melt Pellets

EVA Hot Melt Pellets

PUR Hot Melt

I don’t think you’ve seen a PUR (Polyurethane Reactive) unless it’s been used in an application process already. In its introverted state, it’s a reactive material that can normally be found in cartridges, slugs, pails, or drums and must stay sealed in its package until used. And it can’t be outgoing by the way, because of its makeup, its moisture cured. Meaning as it’s melted in a closed system, it’s not exposed to air until it reaches the application between the intended substrates. At that point, once exposed to moisture in the atmosphere, an initial strong bond forms within a few seconds and continues to strengthen towards a permanent bond as the PUR crosslinks. Most of its curing time is developed within eight hours after application and is fully crosslinked by two days (range of time has to be considered depending on humid/arid conditions). It too is offered at various temperature ranges, open times, and tack ranges. It’s a great choice for book binding, general product and furniture/cabinet assembly work, and carpentry where a strong bond is required to difficult low energy substrates and with a durable
need for heat and cold resistance exposures.

EVA hot melts versus PUR hot melts

As you know there are many variables that go into making a choice of which hot melt is best for the job. Some examples are EVA’s have a longer shelf life, start-up costs can be much lower, cure time is a few seconds, and the ease of operation from setting up the equipment to the clean-up process. PUR’s bond to more difficult substrates which can require less adhesive, excellent lay-flat and flexibility, can better handle recycled papers and cross-grained stocks, is resistant to print oils in the digital printing industry, and can survive in more extreme temperature/moisture conditions. As with anything, both advantages and disadvantages must be weighed out before making a decision.

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Customer Service

Posted on January 30th, 2012 by Maria Verros

We pride ourselves on excellent customer service at LD Davis. A large part of our competitive advantage, aside from manufacturing quality animal hide glue for over 85 years, is the fact that our salesmen make over 3,000 on-site, in-person visits to our customers each and every year. This personal, face-to-face attention shows our clients how much we really care about their adhesive application.

The following is a quick thank-you note one of our salesmen, Jeff Palmiter, received from a client of his that works at a large packaging company:

“Jeff,

Just a short note to express our appreciation for the effort you made to take care of our glue shortfall. Meeting our driver midway made a big difference in the timely delivery of the needed glue back to our facility as well as taking my call late last evening to discuss the possible scenarios to get the glue to Roanoke.

You displayed another example of a way L.D. Davis is above all the others.

Look forward to seeing you next week when we will conduct the glue tests.

Thanks again,

Kurt.”

At LD Davis, we will do everything in our power to ensure that our customers get the animal hide glue that they need, when they need it. The above communication came after Kurt discovered an unexpected shortage of their animal hide glue right before a big project. His salesman, Jeff Palmiter, went above and beyond to get him the animal hide glue that he needed to do his job correctly.

Clients cannot go wrong with LD Davis’ customer service or quality adhesive products. We have been manufacturing excellent animal hide glue and liquid glue, both eco-adhesives which are totally non-toxic and biodegradable for many decades. We also distribute hot melt adhesives, PUR glue and fugitive glue from respected companies around the country. We are here for your adhesive needs, no matter what.

For more information, please visit our website, leave a comment, or communicate with us via Facebook, Twitter, YouTube, LinkedIn, and Google+.

Product Spotlight: PUR Glue

Posted on October 6th, 2011 by Maria Verros

Animal glue manufacturers are few and far between. In fact, there are only two major animal glue manufacturers in the United States, and we are the largest. Animal glue, or hide glue, is available through distribution companies throughout the country and the world, but do not confuse animal glue manufacturers with distributors. On the contrary, we manufacture our own animal glue, but we are a distributor for other types of glue that we don’t manufacture, such as fugitive glue, hot melt, and PUR glue, or Polyurethane Reactive Glue.

What is PUR Glue?

PUR glue is a specific type of hot melt glue. We distribute H.B Fuller hot melt adhesives, and you can click here to read more information about them. PUR glue is a more recent development in the hot melt world. They polymerize when applied, forming a much stronger bond than other hot melts. It is quite flexible and can be used in a wider range of temperatures than most hot melts. PUR glue is often used in perfect binding as book binding adhesive. Our animal glue is also used in other methods for book binding adhesive.

Advantages of Using PUR Glue

Unlike traditional hot melts, need to be left to cure for a full day. The bonds occur when the chemicals in the glue draw moisture out of the air. PUR glues are incredibly strong and flexible, and work beautifully as book binding adhesive using the perfect binding method on difficult jobs. Like most hot melts, they tackify immediately, although PUR glues, as mentioned above, do require a 24-hour curing period. Common uses for PUR glue include bookbinding spine glue in certain binding applications. Other bookbinding methods depend on animal glue manufacturers like L.D. Davis for hide glue to get the job done correctly.

Main Uses

PUR glue is often used in the following industries:

  • Packaging,
  • Woodworking
  • Electronics
  • Shoes
  • Printed film

L.D. Davis has been manufacturing eco-adhesives for over eight decades. In more recent years we have expanded our horizons to distribute hot melts, PUR glue, and other types of adhesives to fit your needs. Whatever the application, we will come up with an adhesive solution.

Learn more about PUR glue here.

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