How to rinse the mounting gun from dried foam. How to cheaply rinse a gun from polyurethane foam

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How to clean the gun from mounting foam? A few simple ways

High-quality and fast installation of systems:

In using this construction tool, the biggest problem is how to clean the gun from the mounting foam after the repair. In operation, it is very convenient, in all respects it wins in comparison with any applicator cans, but its design does not really correlate with maintaining equipment in exemplary order

At the same time, the tool itself is not cheap and will obviously be needed in the future - in any case, to those who are not used to calling a repair team for every trifle.

Therefore, it is worth remembering the most important rule: the foam must be removed in a fresh state. However, if you missed this moment, do not fall into despair and throw away a valuable tool: it is still subject to salvation.

How to clean the gun from mounting foam, including frozen foam, is the topic of our article. We hope that our advice will help you in your decision.

Competent approach

Any person who has a construction gun on the farm and is at least a little prudent will certainly purchase a cleaner in advance. We note one subtlety: professional builders advise taking the solvent at the same time as the foam, from the same manufacturer. The fact is that the composition inside the cylinder may differ significantly from the similar one. He will clean it in any case, but much worse than his own. Using this tool is easy:

The used foam can is removed from the gun.
The protective cap is removed from the aerosol cleaner.
A new balloon is fixed in place of an already unnecessary one.
The trigger is pressed, several times, until the jet does not contain lumps of foam.
The spray can with the cleaner is removed, the free play of the trigger is checked.
If there is still a product left inside, the cap is put back, and the can is stored for the next time.

Do not forget that there is a solvent inside the container, which, like any chemical, is not very healthy. And he's under pressure. We follow basic security measures:

do not store packaging near the stove or in the sun;
we do not try to open or burn an empty cylinder;
working on our own; if the jet gets into the eyes, nose or mouth - run to the doctor;
be aware of the risk of explosion and do not smoke nearby.

Force Majeure

Now let's say that for some reason, timely flushing did not take place. The foam is tightly frozen inside, the trigger is not pressed. The main thing you should never do is put pressure on him. By brute force, you will only achieve the fact that you will break the mechanism. We act consistently and accurately.

First of all, the barrel is freed from the foam adhering to the outside. A knife is quite suitable for this purpose. Our task is not to scratch the piston.
The gun drops to the ground. At the very beginning, carefully, so that it does not get on other parts, a solvent is instilled.
Smoothly, without sharp insistence, the trigger is pressed. No rudeness - we act gently and without jerks, gradually. If the problem is small, thin foam will start to come out at this stage. No, move on to the next step.
An unyielding trigger indicates that the foam has jammed the main valve. Near the place where the cylinders are screwed on, there is a small ball. The next few drops of solvent go to him. After 10 minutes, a bottle with a wash is attached.
With careful pressing, we are trying to purge the tool. If this does not help, it is the turn of drastic measures.
The gun adheres to the bottom of the socket, the crown is carefully unscrewed. The valve is removed and set aside. The solvent is buried in the interior of the construction tool and in the nest. After waiting for 25 minutes, by pressing the ball, the parts are freed from foam clots.
The last stage - assembling the tool into working condition - is carried out in the reverse order.

Most neglected case

To put it bluntly: the actions described in previous section, are effective only in the case when the foam has begun to solidify, but has not yet turned into reinforced concrete. When she has clung to the parts of the gun with the same force with which she holds double-glazed windows in window openings, gentle procedures are ineffective. However, it's a shame to just give up.

If the chances of saying goodbye to the tool and going to the hardware store are still great, you can stop being silly. A hardened montage does not lend itself to any chemicals, it can only be affected physically, which is what you have to do.

Looking for a hard wire of the right diameter.
Spin the gun, removing everything that can be dismantled from it. In different designs, the set of such parts is different, but, I think, a real repairman is quite able to disassemble such a mechanism.
With a wire, digging ordinary acetone into the treated area, clean off all the observable shreds. You need to try not to damage anything, but there are no particularly thin and vulnerable parts in the mounting gun. Acetone softens the hardened foam quite well.
The last step is cleaning the muzzle. A little solvent is also poured in there. If the target is clogged all over, you will have to pick out the cork piece by piece.
When the wire comes out from the opposite end of the muzzle, the tool is assembled to its original state, a can of cleaner is connected to it, and the entire system is thoroughly washed.

The people say that the method is quite effective, although it takes a lot of time (no one succeeded in less than an hour) and extreme caution so as not to damage something vital for the further performance of the pistol.

The main drawback of the proposed method is that it is unlikely that you will be able to completely mechanically clean the foam from the inside of the barrel - and because of its round section, and due to the fact that it is not visible where the remains hid. So it is likely that there will be some reduction in foam pressure the next time you use it. And if you once again bring your weapon to such a disastrous state, the diameter of the barrel will narrow even more, even if you manage to clean it.

Hence the conclusion: in order not to invent ways to clean the gun from mounting foam in a frozen state, before using it, put a bottle of cleaner next to you - it will not let you forget about the need to use it.

As you know, mounting foam hardens quite quickly in the open air, which is good when it is applied to building structures. But if this happens inside the construction gun, then there will be no way to continue the work of filling the gaps or sealing the joints.
Is it really because of this that you will have to buy another tool, the price of which starts from 500 rubles? What if the same happens to the other? So on pistols for a short time and go broke.
But not everything is so gloomy. Firstly, there is a universal foam cleaner in cans, which costs about 300 rubles. Its contents can be enough for two or three cleanings, that is, each such procedure will cost you 100 rubles.
Is it possible to do without this expensive tool if it becomes necessary to clean the construction gun from the mounting foam that has dried inside it? Yes, there is such a possibility. You can make a very simple device yourself, which will cost you a total of 5 rubles and can be used as many times as you need.

Working on the Gun Flushing Tool

For its manufacture, you will need an old balloon from under the polyurethane foam, or rather, its upper part, which can be easily and accurately cut off with a carpenter's knife.

We clean it of old foam and remove the valve using the following simple manipulations.

We insert the rod into the hole and knock it with a hammer until it rests on the valve.

Then with reverse side, succumbing to the valve, we tear off with the help of pliers. Moreover, the lateral short tube that opened after the valve was removed should remain in place.

Next, we glue a 20 milliliter medical syringe, since it is he who fits tightly into the valve hole. A syringe in volume less than the specified one will hang out, and more will not enter.

After these manipulations, using a glue gun, fill the junction of the syringe and valve with epoxy or some other suitable agent. It is necessary to give some time for the glue to harden, after which the device is completely ready to work on flushing the construction gun from the mounting foam that has dried in it.

In principle, you can limit yourself to just sticking the tip of the syringe in the hole where it is inserted. But it will be more reliable to completely fill the connection with glue, since the device will have to be twisted and unscrewed, applying some effort. In addition, when flushing, quite large pressures arise in it.

The process of cleaning the gun from dried foam

Next, you need to unscrew the gun with the remaining and hardened mounting foam from the can as soon as possible, since the valve often does not work. Pour about one syringe of solvent into the can to clean the valve.
Then we install our device on a construction gun and wrap it until we hear a hiss, which indicates that the device is screwed to the end.

Pour the “646” solvent into the syringe using another syringe, insert the piston and start flushing the gun. To do this, pressing the piston, we press the trigger of the gun. Portionwise incoming solvent will gradually contribute to the removal of hardened foam from the gun channels, first diluting it. For complete cleaning tool, two refills of the syringe are enough.
Usually, after using our device, so that it is ready for use next time, it must be rinsed and finally filled with a syringe of water, and left until the next use.

Final remarks

Still, the syringe in the lid must be filled with the same epoxy. Here, retention and tightness will be ensured by a large volume of glue. Otherwise, nothing will work out: it is practically impossible to glue plastic to plastic.
The experience of many craftsmen shows that if a can of mounting foam is screwed on correctly, then it does not harden during storage for months. A film may form only at the end of the tube, which must not be removed during storage. It is she who does not allow air to penetrate into the tool and protects the foam in the gun from hardening.

The procedure for removing the remnants of the old foam is not particularly difficult even for those who first picked up a tool for foaming the surface. Most manufacturers are detailed instructions how to clean a foam gun is the easiest way so that the cleaning process takes a minimum of time and does not become fatal for the tool itself. Unfortunately, the lost paper with the cherished instruction has to be looked for after the gun with dried foam finally stops working.

How to clean a pistol properly and effectively

Sooner or later, the gun for working with polyurethane foam starts to work unstably, jerkily, and at one moment stops the supply of foam. If such a situation has arisen, do not rush to press with all your might on the trigger, one excessive effort, and an expensive repair of the foam gun will be guaranteed. There can be two reasons for the mechanism to freeze:

Sealing with a polyurethane film the stem or needle that controls the valve on the barrel cut;
Sticking in the foam of a ball valve with a spring.

In both cases, force will not help to clean the cork, for example, to rip off a needle seized by mounting foam, a huge effort of several tens of kilograms will be required. On the other hand, using a branded flushing mixture, acetone or Dimexide, you can clean the channels without any effort, you only need a couple of keys and a bunch of wooden toothpicks and chips of different sizes. The choice of method for cleaning the foam gun depends on the model of the tool and the degree of neglect of the device.

How to Maintain a Foaming Gun Properly

In theory, you can clean any gun, even those models that are considered disposable and non-separable. best pistol of all times of the Hilti trademark, which is considered non-separable, is also cleaned with the transition to new type mounting foam or after storage for more than one year with the cylinder installed.

A tool that works with such a complex adhesive mass as polyurethane foam must be cleaned regularly and carefully remove residues, especially from parts of valve systems. Most users forget that polyurethane foam is polyurethane foam, in fact, adhesive foam. If you clean the gun with the first solvent that comes to hand, then the resulting solution of the polymer in the solvent can turn into a thick film, hard as a stone. Cutting off a glue bump even with a knife is very difficult, not to mention cleaning the gun chamber with an alcohol-acetone mixture or solvent.

The easiest way is to use a ready-made branded cleaner for a foam gun. In composition, it almost does not differ from acetone, contains a foam setting retarder and an inhibitor that protects rubber gaskets from drying out. If you clean the gun for a year with one acetone, then the mounting foam in the form of a dense adhesive mass will siphon through the butyl-styrene gaskets that have lost their elasticity.

For your information! Most finishers who constantly work with foam find that instead of cleaning the tool, it is best to store it with a new can of foam.

This decision is justified if the gun is used every day. If the tool is used every three to four months, it is best to rinse it immediately after use with any available foam gun rinse, then clean with a solvent and dry.

Intermediate cleaning, how to properly clean the tool in the process

The organization of instrument maintenance, its preparation for storage is fundamentally different for professional finishers and ordinary users. The pros are more practical:

Leave the old cylinder, even if it is almost empty. This allows you to protect against the access of water vapor in the air. You just need to clean the nozzle on the extension, this will require an ordinary match, cut obliquely with a knife, and a few drops of acetone;
If a new foam bottle is installed, the procedure is the same. It is necessary to squeeze out a small amount of the mass, after which, with a toothpick, a cloth moistened with acetone, and a knife, traces of polyurethane foam are removed from the nozzle of the tool and nozzle.

It makes no sense to lick the tool and try to clean it to a shine, if in the near future the gun will need to be put into action again. The cylinder mounted on the gun will block the access of air and thereby protect the internal valve from the hardening foam mass. Mounting foam without contact with air water vapor remains in a liquid state for a long time.

The outer needle valve on the barrel must always be washed and cleaned after work from the polyurethane film, into which the remains of the mounting foam turn. If there is no time to clean the gun from the remnants of the mounting mass, you can tie the nose with a rag soaked in a common nitro-based solvent or Dimexide.

Advice! Do not attempt to clean the gun with anything other than wood chips or toothpicks.

Aluminum or steel wire leaves marks on the inner surface of the needle valve, as a result of which the uniformity and stability of the spray foam is disturbed. Due to poor tightness, the foamed polyurethane inside the gun with a worn needle and seat hardens in a few hours, while on a new, even the most budgetary product, the setting time is at least three days.

How to clean a week old foam gun

With a large amount of finishing work, there is simply not enough time to put in order or clean the gun. When the hands finally reach the tool with the mounting foam remaining in the barrel, it turns out that the trigger with a significantly increased effort, but you can still press it, but instead of a torch, only small drops of foamed polyurethane fly out.

The recovery problem can be solved in three ways:

If there is no time for a thorough cleaning, then the easiest way to try to clean the valves is with a small injection of acetone. To clean the pistol valve, you need to lightly press the trigger and use a five-cc medical syringe with acetone or solvent to quickly squeeze the contents into the barrel. In a similar way, you need to clean the ball valve.

Important! The force required to turn the knob is the best indicator of the degree of polymerization of the foam. Instead of pressing the trigger, you can turn the locking needle several times to restore its mobility.

Before cleaning the gun from the mounting foam, perform the procedure for turning the stem. It remains only to install a fresh bottle and squeeze out the dissolved films with the pressure of fresh foam.

How to clean the gun according to the instructions

Modern models of pistols allow you to remove the barrel even with the cylinder installed, you just need to pre-wrap the foam flow regulator to a minimum and put the tool on the fuse. The foam still remains in the barrel, but when the pressure is blocked, it will not splash out on hands or clothes.

If the degree of polymerization of the mounting foam is low, then the easiest way is to clean the gun with a proprietary mixture. To do this, you just need to remove the old cylinder and install a container of acetone. For professional pistols, it is necessary to open the regulator and press the trigger several times, after 25-30 minutes repeat the procedure until the dissolved assembly mixture is completely gone. For example, clean the foam gun, as shown in the video https://www.youtube.com/watch?v=kKeJgYBYreU.

The cheapest models are best cleaned mechanically, by hand and with a tool. If there is a need to clean and rinse a cheap model of the gun, you need to fill the gun with a cleaner for 5-7 minutes and, after the final cleaning, rinse the insides with solvent 647 with a small addition of Galosha gasoline. In this way, it is possible to protect the rubber seals from swelling and premature wear.

We clean the gun with old polyurethane foam

If the tool was stored with the cylinder connected for more than two months, or open for a couple of weeks, there is nothing left to do but mechanically clean the gun from the hardened mounting foam. Just take it apart to the screw and clean it with a piece of wood and a little acetone.

How to disassemble the device

Within a month, the mounting foam inside the gun turns into a fairly viscous or solid substance. The polyurethane mass behaves like glue, it adheres perfectly even to the polished walls of the barrel, and cleaning it with a scraper is not as easy as it might seem at first glance.

Before you disassemble the gun for mounting foam, you must definitely get acquainted with the scheme of the tool. This will help not to break the parts when disassembling the device. Often, threaded connections were firmly glued together with a polyurethane film, and in order to unscrew, for example, a flange for installing a cylinder, one has to exert efforts bordering on breakage of parts.

In order to clean the device, it is necessary to remove:

The nose nozzle on the barrel of the gun, in order to clean the part, you need to send it to a cup of acetone for 10 minutes;
The flow regulator simply unscrews the thread from the stem;
The sealing nut of the needle valve stem is unscrewed with a wrench by 8-10 mm;
The landing flange for a cylinder with polyurethane foam is unscrewed with a conventional screwdriver, inserting its tip between the side drains.

The day before, all threaded connections can be sprayed with Dimexide and left for two to three hours, after which the reagent must be wiped off with a cloth moistened with a solvent. Acetone is added inside the ball valve and barrel.

The process of cleaning the parts of the gun for polyurethane foam

The first step is to remove the central rod of the needle. After removing the regulator screw, a short piece of current will remain free, which must be wrapped with thick paper and, grabbing it with pliers, you can pull out the entire stem with force. An empty barrel can be cleaned with a knitting needle or simply punch a foam cork with a wooden stick of a suitable diameter.

The most difficult step is cleaning the mounting flange with the valve. The foam sticking out from above can be cut off with a sharp knife, in order to clean the valve with a ball and spring, you will have to fill it with acetone. After softening, the spring is slowly unscrewed from the cavity.

In addition to metal and plastic parts, it is necessary to remove the rubber gaskets, wipe them with a cloth moistened with acetone, lubricate them with grease, such as grease, and reinstall.

Conclusion

Before assembling the gun, it must be cleaned of polyurethane foam and washed with a solvent. All parts are installed on the gun for polyurethane foam only in dry and pure form. Cleaning the machine mechanically requires a large number time, but you can clean the gun without the risk of dissolving body parts and gaskets. The best way to remove polyurethane is a mixture vinegar essence and acetone, while the mixture is non-toxic and safe enough for human health.

The main difficulty in operating the gun is to clean the structure after applying the mounting foam. Despite the convenient scheme of use and the advantageous advantages of the tool over household cylinders with a conventional applicator, the design has an inconvenient structure for trouble-free cleaning.

Foam cleaning is carried out immediately after application, until the sealant has had time to dry completely. But if the material has hardened, there are methods to get rid of contaminants.

Gun design

In no case should you wash off the foam with water, because it is a kind of catalyst that enhances the polymerization process of this material.

To avoid unforeseen situations, you should get a cleaner in advance to remove traces of mounting foam. On the part of specialists, it is recommended to purchase a product of the same brand as the sealant used in the work.

This requirement is due to the fact that manufacturers create cleaners based on their own formulas for the manufacture of mounting foam. The use of products of the same brand leads to an effective result.

The system for using the foam remover:

After applying the mounting sealant to the appropriate areas, the can is removed.
The cleaner bottle is screwed into place.
The trigger is pressed until the jet from the gun is without traces of mounting foam.

This completes the cleaning of the device. It remains to check the design for the absence of sealant residues. If further use of the suture filler balloon is intended, the cap is returned to its place until the next use.

Purifier device

Any cleaners, in fact, solvents. All of them can be harmful to health. Therefore, they follow the safety rules.

Protective measures:

The product is not stored in direct sunlight or near objects with high temperatures;
Empty cylinders after use must not be burned, opened;
The tool in the process of work is directed “away from you”. Contact with the material in the nose, eyes and mouth is unacceptable, if this happens, you should immediately seek medical help;
The product must not be stored near sources of open fire;
The room is recommended to be well ventilated.

How to remove hardened buildup of sealant

In cases where the cleaner flush is not completed in time and the foam has blocked the trigger, a different fouling control technique is used.

On a frozen trigger, do not press hard. If the mechanism does not lend itself to pressure when gently pressed, then the application of force will break it.

The scheme of actions in this case is as follows:

First, the tool barrel is freed from external contamination. Often foam sticks to the gun and a knife is used to remove it. The structure should be cleaned very carefully so as not to damage the piston.

External cleaning with a knife

After that, the device is lowered down. Using a special solvent designed to remove the cured sealant, treat the beginning of the structure with a small amount of the substance. At the same time, contact of the dissolving liquid with other components of the tool should be avoided. This leads to damage to the gun and damage.
After waiting a little, try to squeeze out the foam by gently pulling the trigger. This must be done without sudden movements and the use of force. If the situation is not too advanced, the liquefied sealant will gradually come out. Otherwise, you will need to change tactics.
A trigger tightly fixed in the gun indicates that the main valve is clogged with sealant. In the area where the cylinders are attached, there is a small ball, on which you need to pour a very small amount of dissolving liquid. After a ten-minute wait, a bottle with a cleaner is attached and cleaning is performed in the standard way.

And finally

Typically, following these steps will resolve the issue:

IN last resort more drastic measures are taken. The tool should be held in the lower part (under the socket) and unscrew the crown. Remove the valve from the structure and set aside.

Disassembled tool

Pour the solvent in a small amount (literally a few drops) into the inside and into the nest itself. The exposure time is at least a quarter of an hour. After that, by pressing the ball, all internal components should be cleared of foam.

Then proceed to assemble the tool. The procedure is carried out in reverse order. In no case should you pull the trigger of the gun if it does not have a bottle of sealant on it. This reduces the life of the device.

In contact with

A foam gun is useful if you decide to do repairs or construction yourself. It sparingly consumes foam, but quickly clogs. Therefore, it is important to know how to clean it from fresh foam, whether it is possible to remove the hardened substance.

Types of foam guns

Cylinders with polyurethane foam are professional and household. Professional ones require a special pistol, which is sold separately. The set of household models already has a plastic adapter with a tube put on it, through which foam comes out.

The design of all pistols is almost the same, but there are collapsible and solid models.

How to clean the nozzle on the cylinder

To remove any remaining foam, release the nipple on the canister itself (the place on the top of the canister where the nozzle is inserted) from the foam column.

After that, lightly press on the fitting: if you hear the hiss of escaping air, the cylinder is suitable for further use - the foam in it is under pressure.

Now we clean the nozzle itself:

To release the tube, lightly pinch it by squeezing with your fingers where the foam remains. The air bubbles remaining in the foam will come out and the column will decrease in volume.

If a professional gun is clogged: how to remove foam at home

It is better to clean the gun after each use. For this, there are special aerosol products produced by manufacturers of polyurethane foam. When buying foam, it makes sense to immediately buy a cleaner. This will always keep the tool in working order. It is recommended to use it in accordance with the instructions.

But even without cleaning the gun every time after use, you can avoid the foam from drying out if you leave the bottle with it in the gun and tighten the regulator until it stops. Air will not get inside and the foam will remain liquid. In this form, the tool will remain operational for up to six months.

If it doesn't move when you pull the trigger, the gun is clogged. Do not try to press the trigger in the hope that you will “break through” the blockage with an effort. This will not happen, and you will break the tool.

How to clean the tool from foam

Immediately after use, you can clean the gun of foam residues with acetone.

First, we will free the barrel from the outside of the dried foam. This can be done with a regular or utility knife. It's okay if you scratch the outside of the barrel, it won't affect the tool's performance.
We lower the gun to the ground and carefully dig a little acetone into the barrel hole near the trigger.
We wait a couple of minutes and gently press the trigger. If the trigger gave way and foam began to come out of the barrel, then the problem was solved. We install a can of cleaner on the gun and clean the tool as usual. If the trigger still won't budge, move on.
We check the main valve - a small ball near the installation site of the cylinder. We drip a little solvent on it and wait ten minutes. If, when pressed, the trigger began to move, we install a cylinder with a cleaner and try to clean it again. If this does not help, the gun will have to be disassembled.
Carefully holding, unscrew the adapter, remove the valve.
We drip the solvent inside the gun. After 20-25 minutes, press the ball with a wooden or plastic stick.
Then assemble the tool, rinse, wait until dry and use immediately or leave until the next use.

If this does not help, it is time for brute force - mechanical cleaning.

How to clean a gun mechanically

For mechanical cleaning we disassemble the tool completely.

We unscrew and take out everything that is possible. Detailed instructions for disassembly are in the instructions for the tool. Try not to break or strip anything when disassembling.
During disassembly, remove foam and wipe all removed parts with a clean rag. Remove the needle, clean the barrel. To do this, you will need an impromptu ramrod, such as wire or a knitting needle.
Pour some washing or acetone into the barrel, then clean it from the remnants of the substance with a wire. Repeat until it moves freely in the trunk and shows from the opposite end. If the foam in the barrel of the gun has hardened for a long time, it will not work to remove it with acetone.
Clean the barrel especially carefully, otherwise, during operation, the remaining foam flakes will interfere with the progress of the foam.
After cleaning the tool, lubricate its connecting nodes, assemble and rinse with a cleaner.
The tool is ready to work again.

How to properly clean a gun - video

Is it possible to wash the old foam that has long frozen

Mechanical cleaning of the gun is quite effective, but if the foam has long frozen inside the barrel, then it is unlikely to be completely removed. As a result, the next time you use the pressure of the foam will decrease, as it will be delayed by the remaining particles of the substance. The disadvantage of the method is the laboriousness and complexity of cleaning. Only help to solve the problem proper care behind the tool after use, i.e. regular and timely rinsing.

How to wash the tool after work - video

Do not try to save money by pumping acetone or other solvent into a used cleaner bottle. Is it dangerous! It is strictly forbidden to open a pressurized cylinder. Acetone is a corrosive and toxic liquid and must be handled with care.

The tool can be saved even with severe clogging, but you should not wait until the foam hardens. Long-dry material is difficult to clean. If you wash the foam gun in time after use, you will not have to resort to time-consuming cleaning methods.