F.A.Q. | Emmeci Elettronica – Design and manufacture of electronic boards and systems

F.A.Q.

Hot melt

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.


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.


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.


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.


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).


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.


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).


Cold glue

What should I do if I wish to make a cold glue system for an extended time?

The cold glue, in contact with the air, it loses the water contained therein and congeals. And ‘good practice to provide the washing of the entire system (adhesive tank, pump, hoses and guns) with lukewarm water in anticipation of prolonged stops (the time is dependent on the type of adhesive used and its viscosity).


Because in some applications it is used a double bonding hot glue + cold glue?

The 2 types of bonding are complementary, in fact the hot-melt adhesive has a short setting time but the bonding may yield when subjected to medium / high temperatures, while the cold glue, while using medium / long setting times, has an irreversible bonding.
In this way the hot glue will ensure bonding the short term even in fast applications, waiting for the cold glue to provide the definitive and irreversible.


The cold bonding is permanent?

After evaporation of the aqueous part of the adhesive bonding is permanent and irreversible. In critical applications, it is possible to combine a cold bonding with glue to one with hot glue. (See related FAQ).


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

The cold glue can be used in all applications where it is necessary a permanent and irreversible bonding of the parts. The low viscosity of the cold glue it also allows the use in applications where it is necessary to deposit of adhesive points of particularly small size or high speed, it being understood that the bonding will be permanent only after the evaporation of the aqueous part of the glue.


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

Each type of cold glue has fields of use different sipendenti both by its features, both from the time that the adhesive employs before pasting the 2 parts (based on the amount of water and adhesive characteristics have setting times and different bonding characteristics).


What is cold glue?

The cold glue, also called cold glue, is a type of liquid adhesive, generally opaque white color, which is formed by an adhesive part dissolved in water. It can be used for bonding almost all the materials (paper, cardboard, certain types of plastics, wood and derivatives, metals, for building material, etc.) With the exception of those non-stick (eg. PTFE / Teflon and siliconised surfaces) and dirty or greasy surfaces. It is also not suitable for paste 2 both impermeable surfaces, given that bonding occurs only when the water present in the adhesive is completely evaporated, operation impossible if the materials to be bonded are non-absorbent.
The cold glue is known in civil field as glue and can be used in a limited number of bondings.
For the industry there are several families and numerous types of cold glue, suitable for uses of each type and with various levels of viscosity and setting time.


Easy Charge

In my works I would like to automate the loading of hot melt systems. It’s possible?

Certainly. Emmeci Electronics produces for adhesive charger in Easy-charge granules. This charger ensures that the tanks of hot glue systems are always filled to the proper level, avoiding both the lack of adhesive, both overfilling of the tank, which would lead to overheating and deterioration.


How do I install a loader for adhesive granules hot melt on my system? I have problems with the maintenance of the system warranty?

The Easy-charge charger available as an accessory covers for the types of hot melt systems popular on the market. In its order must specify, among other options, even the type of hot melt applicator to be connected to the charger; in this way the cover will be provided to replace the original implant, which will not be altered, keeping also the eventual this warranty.
Emmeci Electronics continually adds new models of covers available for Easy-charge charger, so you are welcome to contact us for any special requirements.


In my works I have several lines with hot melt systems. If you want to automate the loading of tanks should I expect a charger for each plant?

Probably not, if the lines all use the same hot-melt adhesive. Each Easy-charge charger can manage up to a maximum of 4 lines simultaneously. The management limit of more lines through a single Easy-charge is given by the maximum distance of the tanks from the same hot-melt charger, which can not exceed 20-25m (40m with the appropriate repeater group) and the height difference to be overcome to step over any transit points of lift trucks or cargo (max. 6m).
It is not necessary that the hot-melt systems are all of the same brand or model, given that each of Easy-charge channel can be adapted to a different type of applicator.


I would use a multi-channel Easy-Charge charger to fill the tanks of the nearest lines, but I have to pass a corridor used by lift trucks or forklifts. What can I do?

Easy-Charge allows to overcome differences in height of 6 meters, height more than enough to override the transit corridors of forklifts. This difference, combined with the maximum length of the tubes (20-25m and 40m in the standard version with Easy-rpt repeater group) allows to solve many problems of installation on multiple lines.


In Easy-Charge charger can use any type of hot-melt adhesive?

Easy-Charge makes it possible to automate the loading of numerous types of hot-melt adhesives (EVA based, metallocene, polyamide, waxes, etc.) That comply with the maximum size of the granules to be transported (12x12mm for the standard version and 20x20mm for that ducts diam. 50mm). It is not possible to make adhesives boots in different formats from granules and tablets (pats, bags, etc.) or with a high tendency to form a compact mass.


Electronics

What are the products drivers from Emmeci Electronics?

The drivers are electronic cards specially designed to activate a host of devices normally used in industrial automation, such as solenoid valves, electromagnets, brake-clutch assemblies, etc.
All Emmeci Electronics drivers are also equipped with the over-boost function, which allows to make faster the activation of the connected device. With Emmeci driver is possible, for example, make faster the operation of the guns for hot or cold glue, allowing the deposition of adhesive points very small even on high-speed lines.


What is the overboost?

It’s a function, present in all the products drivers from Emmeci Electronics, which makes faster the device controlled by the driver. For more information read the previous FAQ.



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