Hot Melt News

Moisture Curing Hot Melt Urethane or Polyurethane Reactive Hot Melt (PUR) is available in 310 ml cartridges to be processed by specially designed hot melt guns with cartridge adapters and nozzles.

If PUR drips, strings, leaks or flows from the nozzle after the gun is deactivated the gluing process can become extremely messy and costly as well as frustrating.

PUR cartridges fit directly into PUR guns where they are heated to a molten state and pressurize in order to flow. With the manual actuation of the pneumatic trigger compressed air is forced into the back of the cartridge. A floating piston separates the compressed air from the molten adhesive in the cartridge. With this pressure applied the molten adhesive flows through the check valve nozzle tip and is extruded onto the substrate. When the pressure is relieved the check valve ball and spring mechanism in the nozzle should quickly stem the flow of adhesive and minimize adhesive “Stringing” or dripping from the nozzle.

We recommend that the following steps are taken to insure that the PUR Cartridge Bead Gun operates properly:

1. Replace nozzle tips regularly
2. Attach threaded nozzle caps filled with high temperature grease to externally threaded nozzles when not in use
3. Replace adapters that attach the nozzle to the cartridge every few weeks
3. Insure that the gun is venting properly when deactivated
4. Do not use dented cartridges
5. Insure that foil seal in cartridge is punctured properly so that foil is not released into the nozzle
6. Preheat all cartridges with the correct preheater for the correct amount of time
9. Insure that the cartridges are thoroughly heated and completely molten before using
10. Raise the temperature of the adhesive where necessary to insure proper machining through the nozzle tip

Please call to discuss the performance of your PUR equipment.

PUR Nozzle tips by:
Pierce Covert,
Glue Machinery Corporation
www.gluemachinery.com

Fast Precise Hot Melt Turf Gluing System

Labor is one of the highest costs facing turf/sports field assembly companies. To minimize the amount of time need to assemble the seams of a sports field the hot melt machinery must be taken into account.

The standard hot melt systems used for on-site turf seam gluing applications are typically small 120 VAC systems with small gear pumps. These systems have insufficient melt rate and pump capacity for most applications and can dramatically increase the field assembly time.

Turf assembly companies require that high volumes of bituminous asphalic black hot melt are quickly applied to four inch tape or seams with coating thicknesses of .005″. This equates to approximately 10 lbs. of hot melt for every 100 feet of gluing.

For this application a 240 VAC 50 lb. hot melt tank (3500 watt, 240 VAC single phase) is needed with 1-2 lb per minute pump, 16′ abrasion resistant hose, High Flow handgun with .055 nozzle tip. Dual orifice nozzles can be added to the gun for single stroke gluing or a 2′ wand can be attached to the gun with a heated holster for the wand mounted on the cart.

For additional gluing convenience the system should be mounted on a wide footprint cart with a boom, hose cradle and tool balancer.

For more information call or email Pierce Covert,
Glue Machinery Corporation
1(888)202-2468 info@gluemachinery.com

Fast Hot Melt Turf Glueing by:
Pierce Covert,
Glue Machinery Corporation
www.gluemachinery.com

Winery Box Gluing with Hot Melt

Most small to midsized wineries do their own packaging. They erect and glue wine box bottoms, insert the filled bottles of wine and glue the tops of these boxes.

The most time consuming portion of the packaging process is the erecting of the wine box and the sealing of the box bottom. When gluing the bottom both liquid adhesives and hot melt adhesives are used. Typically the box is opened, the minor flaps folded in, the adhesive applied, the major flaps folded over the minor flaps and the box flipped over and compressed from the inside.

This process is very time consuming and tedious especially when using white or water based glue. Because this is so labor intensive it is not considered ergonomically correct package assembly. Fortunately, this problem can be easily addressed.

We recommend wineries purchase or build the correct box erector. This consists in its most basic form of a high volume hot melt system, box mandrel and tool balancer to hold the hot melt handgun. With a properly sized mandrel and box stop on the mandrel post, the box can be squared and the flaps glued in two quick steps. Slide the box over the box mandrel, fold the flaps, apply the hot melt, compress the flaps, pull the box off the mandrel and repeat. The hot melt gun should be properly “tool balanced” for easy use.

This system and will allow operators to easily make quality packaging at a much higher rate with less fatigue. The typical hot melt cost per box bottom is one cent.

Gluing the top of the case with hot melt is much easier and it requires half the adhesive quantity.

For more information call or email Pierce Covert,
Glue Machinery Corporation
1(888)202-2468 info@gluemachinery.com

Winery Box Gluing by:
- by Pierce Covert,
Glue Machinery Corporation
www.gluemachinery.com