DE2644630A1 - PIPE TO ACCOMMODATE A SEAL WITH AN IMPROVED SEAL TO DELAY AIR PASSAGE - Google Patents

Description

Tube for receiving a sealant with an improved seal to delay the passage of air

The present invention relates to an improved pipe for receiving a sealant - hereinafter referred to as "sealing pipe" for short. called - and it relates in particular to a sealing pipe with an improved seal over the Passage of air and moisture at the point where the piston in contact with the rear end of the sealing pipe body comes.

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Sealing pipes are known. There are many forms of it on the Market. Generally, such a sealing tube comprises a tubular one Body, a plate fastened to one end piece thereof with an opening therein, to which a protruding sealed plate Nozzle is attached. After the tube is filled, the rear end of the tubular body is used to seal the Tube inserted a piston part.

In order to use the caulking tube, the tube is generally inserted into a caulking gun and the tip sealed the nozzle is opened one way or another by cutting. Then the plunger of the sealing cannon acts on the piston and pushes out the material contained in the sealing tube the now open nozzle.

Such sealing pipes are usually used for packaging Materials and more used in particular waterproofing agents in an anhydrous state and to prevent them from getting with the Come into contact with humidity. Most of the materials that are packaged in such caulking pipes harden into one hard, solid state when exposed to air or humidity.

It is therefore very important when packing such materials in sealing pipes that these sealing pipes dei. Passage from Are as impermeable to air as possible so that the material packaged therein has a long useful life.

One of the waterproofing materials that are packed in waterproofing pipes and which must be kept in an anhydrous state before curing are cold-curing silicone rubber compounds. Such Compounds remain uncured in an anhydrous state, but they cure to a solid silicone elastomer when exposed to humidity suspends. It is therefore highly desirable to have such cold-setting silicone rubber compositions in sealing pipes in this way to pack so that the sealing pipes are as airtight as possible without unduly increasing the cost of the pipe.

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A particularly difficult problem in manufacturing and packaging such materials as cold-curing silicone rubber compounds or other sealing agent, in sealing pipes that was Create an airtight seal with the piston part. Although the piston part is usually a few hundredths of a millimeter is larger than the sealing tube and he is in the rear end of the sealing pipe is pressed in to create as tight a seal as possible, it was found that despite of these measures in most cases an airtight seal was not obtained.

Various methods have therefore been tried to address this problem to solve. So were z. B. aluminum and metal foil caps sealed under the action of heat at the rear end of the sealing tube applied over the piston. The difficulty such metal foil caps are such that they unduly increase the price of the sealing pipe and are also lightweight damaged or punctured. Plastic end caps have also been tried, but these have the same night - .. ile like the aluminum foil cap and they also turned out to be not airtight.

Some manufacturers have applied adhesives or glue to the rear end of the sealing tube after the piston was inserted was to achieve an airtight seal of the piston part with the rear end piece of the sealing ^ tube. the The difficulty with this is that there is a difficult manufacturing practice for filling the caulking tube with The method to be used is the sealing material. As a result, further difficulties arose for the users of the sealing pipe the sticking of the piston to the inner side of the sealing tube because of the adhesive present there.

A more advanced approach has been to use different ones non-adhesive coatings applied to the rear end of the piston and sealing tube after the piston was inserted into the tube. While

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proved this approach as a cheaper and less trouble to the user causing _s has been found, however, that even in these cases, not always airtight seals were achieved. One reason for this is that when certain materials are packaged in sealing tubes, those materials are poured into the sealing tubes at elevated temperatures and then the piston is inserted. If the material in the sealing tube cools _s is pulled, the piston inwardly thereby breaking a seal that may be _s formed by such outer coatings. It has been found that a _s to coat the inside of the rear end of the sealing tube with certain materials allows an excellent airtight seal with a piston to increase the cost of the seal without unduly tube "

The present invention provides a caulking tube with an improved seal for retarding ingress created by air and moisture in the tube which comprises a tubular body with a first and a second end piece, an end plate with an opening therein which is connected to the inherited end piece of the tubular member, and one protruding tubular nozzle with a sealed tip at one end and an opening at the other end that connects to the open End over the opening in the end plate with this plate is connected, the improvement according to the present invention being that the inner surface of the tubular Part with a moisture-proof adhesive inorganic or organic material coated to a thickness of at least 0.025 mm for at least 1 cm from the second land µm the entire circumference of the second end of the tubular part is applied.

Although a polyethylene-based microcrystalline wax is the most preferred material for forming the coating, other known materials can also be used, such as latices or fats. All that is required is that the material is in the specified Thickness at room temperature or elevated temperatures

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can be applied in a molten state that it is inert to the in learning sealing tube material to be packaged that it haftt on the inner sides of the sealing tube _s is it applied in the molten state, or otherwise, without it sticks necessarily that ambient temperatures without bursting or hairline cracking so that it can be applied moisture-proof ± 3t and easily without special procedures.

By the present invention, a method is provided for forming such a coating, which generally comprises the application of the coating to the sealing tube by wiping, brushing _s spraying, dipping or in some other known manner and allowed to dry the coating in which, if is required. Then, the i-.udientungsrohr is filled with the desired material _s and the piston is pressed into the rear end of iibdichtungsrohres to the point that the front face of the plunger does not extend beyond the farthest inwardly reaching edge of the coating. This must also be the case if the piston moves forward as a result of the cooling of the material in the sealing tube. It has been found that the contact of the piston with the coating on the rear end of the sealing tube forms an excellent seal against the passage of air and moisture.

The invention is illustrated below with reference to in the drawing Embodiments explained in more detail. Show in detail:

Figure 1 is a side view of an entire sealing pipe 3 with fragmentary views of the front and rear End of the pipe,

Figure 2 is a cross-sectional view of the rear end of the sealing ring with a fragmentary side view of the piston in the case of a beveled piston,

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Figure 3 is the same view of Figure 2 with the exception that the piston is not beveled,

FIG. M is a view similar to that in FIGS. 2 and 3, in which a cross-sectional side view of the rear end of the sealing tube is shown with another embodiment of the piston in which the piston is beveled, and FIG

Figure 5 is a view similar to Figure 4 except that the bottom of the piston has a different configuration than in Figure 4 and that the sides of the piston are not beveled.

The sealing tube shown in Figure 1 has a tubular body portion 10 which any desired wall strength can have, which is usually about 1 ₉ 25 mm. This tubular body can be completely cylindrical or it can be tapered from the front end 11 to the rear end 12 in such a way that its diameter becomes somewhat larger from the rear to the front end. However, this embodiment is not particularly advantageous because it leads to a waste of material by the user of the sealing pipe.

The front end portion of the tubular body is provided in known manner with a cap plate 13 having an opening lh. This cap plate, like the tubular body part, is made of a material which has been treated so that it is airtight, and this plate is sealed to the tubular body 10 in a known manner. A protruding nozzle 15 with a closed tip Ί6 is attached to the cap plate 13 via the opening I ^{1 J.}

In a new development, the tubular body 10 _9, the cap plate 13 and the protruding nozzle 15 can all be formed in one integral piece from any known plastic. The integral piece is then very un-

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permeable. If it is desired in such a case to pack material in the tube which is to be kept in an anhydrous state, it is not necessary to put a seal over the opening Ik if the body 10, cap 13 and nozzle 15 are formed in one piece. The cap plate 13 and the protruding nozzle 15 can also be formed from different materials in separate pieces and sealed together. The tubular body 10 and the cap plate 13 can be formed from cardboard covered with treated aluminum foil so that the material is airtight. In addition, the above nozzle 15, which is usually formed from polyethylene, can be connected in a sealed manner to the cap plate 13 by methods known for the production of sealing pipes.

If the tubular body 10, cap plate 13 and protruding nozzle 15 are formed as separate pieces and assembled into a unit with one another, then it is often necessary to ^{seal the opening I 1} I with an aluminum foil, since the nozzles made of a low-density material have a certain tendency have to let the humidity penetrate.

If the tubular body 10, cap plate 13 and protruding nozzle 15 are all formed as an integral piece of plastic, such as high-density polyethylene, polypropylene or an ethylene / propylene copolymer, then it is not necessary to place a metal foil over the opening lh , as the Plastic, when used of sufficient dimensions, is impervious to the passage of air moisture through the nozzle 15 or any part of the tubular body 10. The parts of the sealing tube which are impermeable to the air passage are known and do not form part of the present invention.

That of tubular body 10, cap plate 13 and protruding Nozzle 15 is assembled sealing tube, so assembled and, regardless of the method of manufacture, normally impervious to air for extended periods of time. The sealing pipes are then placed on an appropriate device with materials

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filled like sealants. After filling with the sealing means and in particular with cold-curing Silikonka .tschukmassen at a temperature of 10-38 ⁰ C., a piston 17 pressed by a front surface 17a and a rear surface 17b in the rear end of the tubular body 10 degrees. As the cold-setting silicone rubber mass cools to room temperature, the piston 17 is drawn further into the tubular body 10 so that air passages are formed between the side 18 of the piston 17 and the side 19 of the tubular body 10, which prevents air from penetrating the sealant allow, which is packed in the sealing pipe. This was noted even for materials that were at ambient temperature when they were packaged and although the diameter of the piston member was larger than the inner diameter of the tubular body 10 and therefore the packaged material did not cool down and further retract the piston in the rear portion of the tubular body. Even so, air leaks or openings formed between side 18 of the piston and side 19 of tubular body 10, resulting in premature curing of the cold-setting silicone rubber compound packaged in the sealing tube.

The inner and rear ends of the tubular body 10, and in particular the side 19, is therefore made in accordance with the present invention with a thin coating 21 made of a moisture-proof Material provided. This coating must be at least 0.025 mm thick in order to seal sufficiently. In general, the coating thickness can be vary between about 0.025 and 0.38 mm, and preferably between 0.025 and 0.25 mm. Is the coating thinner than 0.025 mm, an adequate seal will not be formed. If the coating has a thickness of more than 0.38 mm, then result Difficulties in pressing the piston into the rear end of the tubular body 10 arise.

The upper limit for the thickness of the coating naturally depends on the diameter of the piston part 17, compared with the inner diameter.

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knife of the tubular body 10 from. In general, the Sides of the piston 20 may be beveled from the front surface 22 in such a way that the front surface is smaller than the rear Surface 23, as shown in FIG. In such beveled pistons, it is therefore only necessary that in one certain point of the side 20a before reaching the rear surface 23, the side 20a has a diameter which is at least 0.25 mm larger than the inner diameter of the rear End of the tubular body 10 so that a proper seal is formed. The diameter of the piston part 20a before reaching the rear surface 23 is preferably 0.25 to 2 mm larger than the rear diameter of the tubular Body 10 at the point at which the piston 17 or 20 is inserted, and at the point in the tubular body 10 at which the piston come to a standstill.

According to the above, the thickness of the coating depends on the outside diameter of the piston, both in the case of a cylindrical one as well as in the case of a beveled piston. The dimensions given above are therefore correct and in every case a coating with a thickness of at least 0.025 mm is required. The side surface 18 of the piston 17 is straight, while the side surface of the piston part 20a of the piston 20 is inclined.

Both the piston 17 and the piston 20 have a cavity 17c and 17c between the front surface and the rear surface. 24 on. These cavities are necessary and not only bring a material saving with them, but they are also useful as an area in which the area of the pressure rod .; a sealing gun can be inserted to operate the sealing tube so that the material packed therein can be dispensed can.

The width of the coating 21 depends on how far the piston 17 extends into the rear end of the tubular body 10 moves before it comes to a standstill. In one case the sealing material is packaged at room temperature, and in one

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In the second case, the material can be packed in the tubular body 10 at an elevated temperature, which may lead to the piston 17 or 20 is drawn further into the tubular body 10 after the material has cooled down. It is only necessary in both cases that the coating 21 to the inner circumference of the side 19 is applied in such a way that the front surface 17a of the piston 17 or 22 of the piston 20 is not over the innermost edge 25 in Figure 1 and 26 in Figure 2 of the Coating 21 protrudes when the piston finally comes to a standstill. The piston 17 has straight sides, and in the case of a beveled piston 20, it is only necessary that the side 20a of the piston 20 which is in contact with the Inner side 19 of the tubular body 42a, does not extend over the innermost edge of the coating 26 in FIG Body 10 extends. While pistons I7 and 20 both have one Have a cavity, the piston can also be made of a thin plate without any cavity. In these cases the cover 21 then only needs to move into the interior of the rear end of the page 19 for a short section to extend to the front end piece 11 of the sealing tube, and in the special case the coating then only needs for extend at least about 3 cm evenly around the rearward end of the interior of side 19 of tubular body 10. Preferably, such a coating 21 extends uniformly for 2.5 to 7 »5 cm around the inner side 19 of the tubular body 10. The coating can expand any distance within the tubular body 10, and indeed the entire inside of the tubular body 10 can be covered with the coating 21. However, this has been used to produce a Good sealing with the piston part 17 has proven not to be necessary and therefore only leads to an unnecessary waste of material.

1 shows the piston member 17 after being inserted into the sealing tube, which is filled with a sealing material 27 that a cold-curing silicone Rubberized | is mass that when filling in the tubular body to a temperature of 2 ^I \ ⁰ C

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and which has drawn the piston 17 further into the tubular body 10 during cooling, so that there is a distance of about 1.5 mm between the rear surface 17b and the rear end 12 of the tubular body 10. In any case, the foremost edge 25 of the coating 21 extends for a certain distance, such as 3 to 13 mm, over the front surface 17a of the piston part H ₃ when the piston part 17 finally comes to a standstill.

Any inert stable, Moisture-proof coating material can be used. So the coating can consist of a chemical compound or mass, which is moisture-proof, does not break at room temperature or gets hairline cracks and adheres to the inner surface of the tubular body 10, although it is not intended to be an adhesive. Furthermore, the material of the cover must be inert to the material packaged in the tubular body part 10 and in particular compared to cold-curing silicone rubber compounds. For economic reasons, the material must be light without any special application technique can be applied. Heavy Lead materials to be applied with the above properties to an increase in the cost of manufacturing the sealing pipe.

Preferred compounds for making such coatings are waxes, and more particularly, polyethylene-based microcrystalline waxes such as those sold under the trade names Derex 10, Derex 12, Derex 22 and Derex kk by Dewey and Almy Co., a subsidiary of WR Grace Co. in Massachusetts. Other preferred materials for producing the coating are fats, latices, silicone fats and certain cold-curing silicone rubber compounds or silane compositions. When the filled into a sealing tube material is one cold-curing silicone rubber composition which is maximally pressed at temperatures of about 50 to about 70 ⁰ C in the sealing tubes, then the material for the coating must have a melting point above about 70 ⁰ C. This is the case with the aforementioned microcrystalline

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linen waxes of the PaIl ₃ , which are sold under the trade name Derex.

The piston part 20 of FIG. 2 has a reinforcing rib 28. Such reinforcing ribs are not necessary, but are in some cases provided in the piston _{s to} give it a special strength _s so that it can withstand the forces of the pressure rod of the sealing gun acting on the piston.

Figure 3 is a view similar to Figure 2 _s the only difference is that the piston 29 has straight edges and, unlike the piston 17 _S contains a reinforcing rib 31st

Figures 4 and 5 are simple cross-sectional views 12 of the tubular body part 10 with fragmentary cross-sectional views of different types of pistons 4 shows a very popular piston member 32 is shown, the tapered sides 33 _s has the rear end for insertion into the tubular body portion 10 wherein the The front surface 34 of the piston part 32 has a protruding curvature 35 adjacent the sides 33 and a recess 3ü in the central part ₉ above which a reinforcing rib 37 is located. This particular shape of the front surface 34 of the piston 32 leads to a piston, the front surface 34 of which is extremely strong and can be easily grasped by the pressure rod of the sealing gun Forces piston evenly through the interior of tubular body 10 as the material packaged therein is applied.

The piston 38 of Figure 5 is similar to that of Figure 4 with df r * Except that it has straight side walls 39 and a simpler type of inwardly extending bulge in the Front surface 41, which serves the same purpose as the piston These different types of pistons, like the most preferred

Referring to Figure 4, have been shown to illustrate that the coating 21 on the tubular body can be used with any type of piston, regardless of its design.

For the tubular body 10, two different types of embodiment are shown in FIGS. The tubular body 10 in FIG. 2 consists, as in FIG. 1, of an integral plastic body. In Figure 3, the tubular body 42 is off Cardboard made of treated moisture-proof on both sides Aluminum foil 43 is occupied, to which the coating 21 is applied.

The above illustrates the two most reliable moisture-proof constructions of tubular bodies 10 used in the manufacture of caulking pipes. However, the present invention is applicable to tubular bodies made of any type of material. The improved sealing method of the present invention for making an impervious seal between the piston and the rearward end of the sealing tube is achieved in accordance with the disclosure above with a simple, effective process. . The tubular body portion with the front plate 13 and the projecting nozzle as are first prepared _s you know with d ^ i coating with dimensions in the frame de: * above limits in a simple and effective manner _s such as by dipping, spraying, brushing or Wipe. If microcrystalline wax is used for the coating, the wax is first melted and applied by some method to the interior of the tubular body part in the dimensions and depth as given above. The wax is then allowed to cool to room temperature, the desired coating 21 being formed on the inner surface of the tubular body portion 10. Then you can fill the tubes with the material to be packaged either by means of a device or by hand. In the case of cold-curing silicone rubber compounds, this material is automatically measured into the tubes by a machine and the piston 17 is pressed on. When the cold silicone rubber compound cools down, the piston moves further into the

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tubular body 10 drawn. It is only necessary that the front surface 17 a of the piston part 17 does not extend over the the furthest inward-reaching edge 25 of the cover 21 extends, after the mass in the tubular body part 10 has cooled. This distance is known from the experience and the width of the cover is dimensioned accordingly.

In this way, the present invention makes it airtight Sealing formed between the piston and the rear end of the sealing tube. That with the invention The method of sealing pipe produced by applying the coating has a storage time that is 25-50 ^ longer than that according to FIG the prior art sealed sealing pipes in which cold-curing silicone rubber masses were packaged. The storage time is about 2 years with a minimum amount of faulty sealing pipes.

To use the sealing tube, it is placed in a sealing cannon and the tip 16 of the nozzle 15 is cut off with a sharp instrument. Is there a slide in the opening 14, then this is made by sticking a nail in the tip 16 simply opened, the nail pulled out and the sealing cannon for applying the contained in the sealing tube Materials actuated.

An excellent advantage of the sealing tube sealed according to the invention is that an airtight seal between the piston and the inner sides of the rear end of the sealing tube is formed, while at the same time the piston when dispensing the sealant, e.g. B. the cold-curing Silicone rubber compound, can be easily moved through the sealing cannon.

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Claims (1)

Patent claims Sealing tube with an improved seal to delay the penetration of air into the tube _y with a tubular body part having a first and a second end piece, an end plate with an opening therein which is connected to the first end piece of the tubular part, and a protruding one tubular nozzle part with a closed tip at one end and an opening at the other end. which is connected to the end plate via the open end and the opening in the plate _s characterized in that the inner surface of the tubular part with a moisture-proof adhesive inorganic or organic material is coated to a thickness of at least O ₂ O25 mm and for a distance of at least 6 mm from the second end piece around the entire circumference of the second end piece of the tubular member. ο sealing tube according to claim l _{s s} characterized in that the thickness of the coating varies from 0.075 to 0.25 mm. 3ο sealing tube according to claim 1, characterized in that said coating _s in a width from 2.5 to 7 * 5 cm from the second end portion around the entire circumference of the second end of the tubular member is applied. i} »Sealing _{pipe according to claim 1 s,} characterized in that the material for the coating is a microcrystalline wax based on polyethylene. ο in sealing tube because urch according to claim _{3 s} I that the material is selected for the coating of fats and latexes. - Q 6. sealing tube according to claim 1, characterized characterized in that the material for the coating is a silicone compound. 7. sealing tube according to claim 4, characterized in that the microcrystalline wax is liable in the molten state and is inert to cold-curing silicone rubber compositions and to not melt at a temperature of about 70 ⁰ C. Sealing pipe according to claim Ij characterized characterized in that the tubular part essentially completely with a cold-curing silicone rubber compound is filled. ο sealing tube according to claim 8 _S characterized ₉ that the edge of the piston part is inserted with a front surface and a rear surface in the second end of the tubular member to form a ^ airtight seal, wherein the front surface does not extend over the coating out. 10. Sealing tube according to claim 9 »thereby characterized in that part of the piston along its axis from up to the rear face, this but not including, has a diameter that is now at least 0.25 greater than the diameter of the second opening in the tubular part. 11. sealing tube according to claim 10, characterized characterized in that the diameter of said part of the piston part is larger by 0.25 to 2 mm as the diameter of the second end of the tubular part " 70981S / 03S9 12. A method for filling and sealing a sealing tube, which consists of a tubular body part with a front and a rear end piece, wherein an end plate is attached to the front end piece, on the one protruding nozzle with a closed tip is attached •, with the rear end of the sealing tube a has airtight seal, characterized by the following stages: (a) Applying a coating of a moisture-proof adhering inorganic or organic material in one Thickness of at least 0.25 now for a width of at least 6 mm from the rear end around the entire circumference of the inner part the rear end of the tubular part, (b) allowing the coating to harden, (c) filling most of the sealing pipe with a liquid material and (d) pressing a piston member into the rearward end of the tubular member. 13. Method according to claim 12, characterized in that the liquid material has a temperature of about 10 to about 38 ^° C when it is introduced into the sealing tube. Ik. Method according to Claim 12, characterized in that the coating is applied by brushing. 15. The method according to claim 12, characterized that the coating is applied by spraying . will. 16. The method according to claim 12, characterized in that the coating is applied by dipping will. 709815/0359 17. The method according to claim 12, characterized in that the thickness of the coating of 0.075
varies up to 0.25 mm. 18. The method according to claim 12, characterized that the coating is 2.5 to 7.5 cm wide from the rear end around the entire circumference of the rear end of the tubular body is applied. 19. The method according to claim 12, characterized in that the coating consists of a microcrystalline Polyethylene based wax. 20. The method according to claim 12, characterized in that the coating consists of a material which is selected from fats and latices. 21. The method according to claim 12, characterized in that the material for the coating a
Silicone mass is. 22. The method according to claim 19, characterized in that the microcrystalline wax adheres in the molten state and with respect to cold-curing
Silicone rubber compositions is inert. 23. The method according to claim 12, characterized in that the liquid material is a cold-curing one Silicone rubber composition is. 24. The method according to claim 12, characterized in that a part of the piston along its axis from its front surface to its rear
Area, but not including this, a diameter
which is at least 0.25 mm larger than the diameter
the rear opening of the tubular body. 709815/0359 25. The method according to claim 2 4, characterized that the diameter of said part of the piston is 0.25 to 2 mm larger than the diameter the rear opening of the tubular body. 789815/0359