CD-Training Hot-Melt | Emmeci Elettronica – Design and manufacture of electronic boards and systems

CD-Training Hot-Melt - Course for maintenance workers and operators for systems of hot-melt


General features

CD-Training Hot-Melt - CD-Training Hot-Melt

Emmeci Elettronica has produced a CD containing a real course for maintenance technicians and operators for systems of hot-melt.

This course allows you to gain important information about the composition of hot-melt un’impianto and procedures to be used to ensure proper maintenance and safer use.

On the CD there are numerous illustrations that complement the information in the text and clarify the concepts.

The course is based mainly training_img1on practical aspect of the hot-melt systems, so it is easy to understand.

The documentation is provided in PDF format, so easily accessible from PC.

CD Content:

  • Safety Standards
  • Glossary
  • General description of hot-melt
  • Pneumatic pump (or piston pump): General principles of operation
    • Hydraulic Section
    • Pneumatic pumps with electric exchanger
    • Piston pumps Types
  • Guns: General principles of operation
    • Pneumatically actuated gun
    • Standard Form
    • Reduced cavity module
    • To zero cavity module
    • Guns Spray
    • Coating guns
  • Nozzles: general characteristics
  • Ground rules for proper use of a hot-melt system
  • Maintenance
    • Tank cleaning
    • Control tank filter
    • Pipe Purging
    • Bleeding guns
    • Changing the filter of the tube-gun fittings
    • Checking and cleaning nozzles
    • Electric gun test


What is the hot glue?

The hot glue, also called hot melt, is a type of solid adhesive at room temperature and which becomes liquid at elevated temperatures (from 100 to 180 ° C depending on the type). It can be used for bonding almost all the materials (paper, cardboard, plastics, wood and derivatives, metals, for building material, etc.) With the exception of those non-stick (eg. PTFE / Teflon and silicon surfaces), those sensitive to heat (es.polistirolo expanded) and dirty or greasy surfaces.
The hot glue is available for civil use in the format in stick, which requires special guns and can be used in a limited number of bondings.
For the industry there are several families and numerous types of hot melt, suitable for uses of all kinds and in different formats (granules, sticks, loaves, bags, etc.).

I have to glue different materials. Can I use a single type of hot glue?

Each type of hot glue has fields of use different employees both from its characteristics, both from the time that the adhesive employs before pasting the 2 parts (there are “fast” adhesives that require very little time before making stable bonding and other less rapid that may be pasted after 10-20 “application and still others, such as those used on adhesive tapes, which show the adhesive effect almost permanently).

Where should I use hot glue? What are the advantages compared to other adhesive?

The hot-melt adhesive can be used in all applications where it is necessary a setting time of gluing of short pieces, as in the closing cardboard boxes or the gluing of parts such as upholstery, wooden parts (especially edges of doors and panels ). Some types of hot melt adhesive are also compatible with foods, so they can also be used in applications in which it is possible to a prolonged contact between a food and the packaging glued.

The hot gluing is permanent?

It is to all intents and purposes a permanent bonding, but the hot glue can yield if the glued piece is reheated. the hot melt is therefore not suitable to be used in those applications in which it is possible that the ambient temperatures can reach values comparable with those used during the gluing process. For these applications it is advisable to use cold glue (cold glue) or the combination of hot and cold glues (solution that combines the advantages of both technologies).

The hot glue is dangerous? What precautions should I follow to use it?

The hot melt, during use, is a high-temperature liquid (greater than 100 ° C) and high pressure. All precautions that should be taken to use are those normally used in hydraulic systems at high temperature. To reduce the possibility of burns by the operators can be applied on the gluing systems the adhesive charger in Easy-charge granules, which allows the filling of melting tubs in a completely automatic way, without interventions by the staff.

During periods of inactivity of the production lines can not leave the set on a hot glue?

It strongly discouraged, because the hot-melt adhesives must be heated only in use prediction. If they remain at working temperature for a long time (hours or even days) deteriorate, forming carbonization able to create the plant of bonding malfunction or, in more severe cases, damaging also in serious way.
It is therefore good practice to turn off the hot melt systems, an operation which requires no further action (to be able to use the facility is sufficient riaccederlo and wait for the attainment of the working temperature).

Esistonono some measures to reduce the problems caused by excessive and prolonged heating of the adhesive:
1) Use the stand-by function (also called economy) of which many hot melt systems are equipped. This operation lowers the temperature of bath, hoses and guns of several tens of degrees, reducing the thermal stress to which the adhesive is subjected.
2) Install the System for adhesive charger in Easy-charge granules, which makes it possible to keep down the level of the adhesive inside the tank; in this way the reduced quantity of molten adhesive present in it is consumed in a short time and replaced by another new.

What should I do if I wish to make a hot melt system for an extended time?

If the plant bonding remains in the same environment in which no operation except the one to turn it off, given that at room temperature the hot glue has of deterioration times is normally used (sheltered from rain or other polluting elements) it is not necessary extremely long.

What happens if I use the hot-melt in hot environments? And if I use it in cold environments?

In warm environments the gluing system generally gives no problems (it being understood that must be respected parameters provided by system manufacturers and adhesive used). However, there may be problems in the bonded, since at high temperatures the adhesive takes longer to set.
In case of cold environments, problems may arise in the adhesive dispensing guns, who are unable to maintain the set temperature and therefore require adequate insulation. Problems may arise also on the glued pieces, given that in cold environments the adhesive cools rapidly and may already be congealed at the time of mating of the surfaces to be bonded.

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