Tag Archive: char

Adhesive Char Solutions – The Benefits of Metallocene

char adhesive

 

Adhesive char is a pervasive issue in all industries that rely on hot melt adhesive. Char buildup in adhesive applicators can cause clogs, uneven adhesive application and ultimately production delays as the problem is addressed through maintenance.

According to AdhesiveMag.com, char buildup can show up at many stages of the application process. …

Continue reading »

A Range of Metallocene Hot-Melt Options Available

Hot-melt adhesives not only offer superior performance properties, but also provide manufacturers with a range of metallocene options and capabilities:

  • High-melt metallocene: Applied at 350 degrees Fahrenheit, this gives production operators a smooth-flowing, consistent, and trouble-free adhesive solution for a wide variety of product operating requirements;

Comparing Costs: Metallocene vs. EVA Hot Melt Adhesive

Previous posts outlined the advantages of metallocene-based adhesives compared to traditional EVA-based hot-melt adhesives, so now we look at costs.

But what about costs?

Metallocene-based hot-melt adhesive may initially cost more than EVA-based hot melt adhesive. However, the costs associated with problems from char-prone EVA can erase any initial cost savings you may have received.

Continue reading »

Key Benefits of Metallocene-Based Adhesives (Part 2)

Hot Melt adhesives based on metallocene boost productivity and economy in packaging operations.

The previous post covered several key advantages of these adhesives compared to traditional EVA-based hot-melt adhesives.

In addition to benefits like no (or very minimal) stringing, eliminating char or gel build up, low (or no) odor, and resistance to extreme heat …

Continue reading »

Key Benefits of Metallocene-Based Adhesives (Part 1)

Metallocene-based hot melt adhesives offer several key advantages compared to traditional EVA-based hot-melt adhesives:

  • Improved mileage: Because metallocene-based adhesives have a lower density than EVA-based adhesives, they can be applied at lower flow rates, often yielding up to 40% reduction in adhesive use compared to EVA.

Preventive Maintenance Can’t Solve Char Buildup

Preventive maintenance, which involves systematic monitoring and periodic flushing of the adhesive application system, can substantially reduce the incidence of charring and gelling and extend the life of applicator hoses and extrusion nozzles.

However, the unfortunate fact is that charring is an inherent problem with EVA-based adhesives (see previous posts). No matter how diligent the preventive …

Continue reading »

The Problem of Char: Negative Effects

Before char is apparent or clogging occurs, char creates a thermal barrier in hose linings. This lowers the optimal operating temperature of the adhesive, causing poor flow performance. When your system applies more heat to compensate, even more char build up results.

When char buildup occurs, pieces break loose in your application system. These pieces clog applicator …

Continue reading »

The Problem of Char: Common Causes

Ethylene vinyl acetate (EVA) adhesive is widely used for packaging hot melt applications. However, because of its chemical composition, EVA tends to develop carbon buildup, or char, inside of adhesive application tanks, lines, hoses, and nozzles.

Char — carbon buildup — occurs when EVA oxidizes at prolonged high temperatures above 350º. This heat and oxidation …

Continue reading »

A Range of Metallocene Hot-Melt Options Available

Metallocene-based hot-melt adhesives not only offer superior performance properties, but also provide manufacturers with a range of product options and capabilities:

  • High-melt metallocene: Applied at 350 degrees Fahrenheit, this gives production operators a smooth-flowing, consistent, and trouble-free adhesive solution for a wide variety of product operating requirements;

Comparing Costs: Metallocene vs. EVA Hot Melt Adhesive

Previous posts outlined the advantages of metallocene-based adhesives compared to traditional EVA-based hot-melt adhesives.

But what about cost?

Metallocene-based hot-melt adhesive may initially cost more than EVA-based hot melt adhesive. However, the costs associated with problems from char-prone EVA can erase any initial cost savings you may have received.

Costs from problems with char buildup …

Continue reading »

Older posts «