EP1861592B1 - Small mattress-like glass fibre structure and method for its manufacture - Google Patents
Small mattress-like glass fibre structure and method for its manufacture Download PDFInfo
- Publication number
- EP1861592B1 EP1861592B1 EP06701623A EP06701623A EP1861592B1 EP 1861592 B1 EP1861592 B1 EP 1861592B1 EP 06701623 A EP06701623 A EP 06701623A EP 06701623 A EP06701623 A EP 06701623A EP 1861592 B1 EP1861592 B1 EP 1861592B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- glass fibre
- reel
- winder
- tube
- muffler
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000003365 glass fiber Substances 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title description 9
- 238000002485 combustion reaction Methods 0.000 claims abstract description 9
- 239000011358 absorbing material Substances 0.000 claims abstract description 7
- 238000000605 extraction Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 14
- 238000009958 sewing Methods 0.000 claims description 10
- 238000004804 winding Methods 0.000 claims description 8
- 230000000875 corresponding effect Effects 0.000 claims description 4
- 230000002596 correlated effect Effects 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims 1
- 239000000835 fiber Substances 0.000 abstract description 3
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 239000002657 fibrous material Substances 0.000 description 4
- 238000004026 adhesive bonding Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229920002748 Basalt fiber Polymers 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000003584 silencer Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
- F01N1/04—Silencing apparatus characterised by method of silencing by using resonance having sound-absorbing materials in resonance chambers
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/002—Inorganic yarns or filaments
- D04H3/004—Glass yarns or filaments
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/02—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments
- D04H3/07—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments otherwise than in a plane, e.g. in a tubular way
- D04H3/073—Hollow cylinder shaped
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/18—Construction facilitating manufacture, assembly, or disassembly
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2310/00—Selection of sound absorbing or insulating material
- F01N2310/02—Mineral wool, e.g. glass wool, rock wool, asbestos or the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
- F01N2450/06—Inserting sound absorbing material into a chamber
Definitions
- the present invention relates to the field of mufflers, specifically to mufflers for internal combustion engines.
- the second method consists in the application of a semi-rigid, sound absorbing, and adequately pre-moulded mass, within the muffler, before the latter is hermetically closed.
- both techniques have some drawbacks.
- the first one is not easily carried out due to the complexity of the blowing operation and to the time required for filling the body of the muffler.
- the second technique is decisively more expensive and therefore it is economically disadvantageous.
- EP 0 074 220 discloses an insert for silencers, consisting of a central cylindrical former, an outer portion (surrounding said former) formed of a fibrous material in which the fibres are preferably basalt fibres, and an outer covering of sheet or scrim material.
- the former is formed from glass fibres mixed with an adhesive binder such as phenol (see EP 0 074 220 , page 5, lines 27-29).
- the insert is formed by inserting a length of the fibrous material loosely around the former, placing the fibrous material and former into a loop of an endless belt, applying tension thereto, and rotating the endless belt to roll the fibrous material around the former and an outer covering of sheet or scrim material is then wrapped around the rolled insert to retain the shape thereof.
- this process differs from the present application in that some parts of the insert are not glass fibres, use of an adhesive is made, and the shape of the insert is retained by additional means, such as the sheet material.
- the purpose of the present application is to noticeably simplify the fabrication of a silencer.
- the object of the present invention is to propose a method of introducing a glass fibre inside a muffler of an internal combustion engine whose muffler has an internal structure defined as "multiple duct structure”.
- the inventive concept at the origin of the present invention is based on the principle of combining the advantages of the aforementioned techniques, without, however, be forced to accept their burdensome drawbacks. Therefore, the present invention intends to completely change the known techniques by providing a cheap product, that can be produced in large amounts with appropriate equipments and machines, and which further can be pre-packaged and is extremely easy to insert into the muffler before the latter is definitively closed.
- the sound absorbing material i.e. the glass fibre, instead of being slowly blown into the muffler, will be directly and rapidly prepared in the factory in accordance with the technique of the present invention.
- a first phase of the method consists in winding, around a rotating tube or a reel-winder with a specific shape, the thread of glass fibre which will form the fmal hank (skein) 1 to be introduced into the muffler.
- Said tube or reel-winder set in rotation around its axis by an electric motor, will give rise to a reel of glass fibre thread, and the diameter of this reel will be correlated to the distance between the internal baffles of the muffler that contain the discharge gas ducts.
- the length of the tube or reel-winder will be similar to the circumference of the total number of said (gas discharge) ducts to be soundproofed.
- said squeezing of the sound-deadening mass is performed in order to allow an industrial sewing machine, of a type similar to the one used by shoemakers, to sew it in one or more parts, so that said mass will finally assume a substantially prismatic shape.
- the object of this central sewing is to permit the handling of the glass fibre, by preventing the individual threads from falling down or getting entangled in an irregular manner before their introduction into the muffler and after their extraction from the tube on which they have been wound.
- the product, sewed in this manner is ready to be introduced manually within the muffler, and it has a width and a length which are perfectly adapted to the space existing within the muffler to be soundproofed.
- the muffler can be simply closed and this can be done indifferently using a covering or an embedding technique, both for moulded or rolled muffler types. This can be done because the sound absorbing material processed according to the present invention does not at all protrude from the outer contour of the baffles.
- the present invention has the object to indicate a new, extremely practical, cheap and quick method of filling the mufflers of internal combustion engines with the sound deadening material.
- Said sound-deadening material is formed exclusively of glass fibre, without any addition of adhesives, additives, or other polymers used for welding or sewing purposes, or for gluing purposes, in order to facilitate the handling of the material before its insertion in place. These substances could in fact possibly give rise to toxic fumes at the elevated operation temperatures of the mufflers, or could require more complex manual operations in order to obtain a mattress-like structure of glass fibre to be introduced into the muffler.
- the present invention in the form of its second embodiment, further improves the first embodiment by allowing the realisation of manufactured articles made of glass fibre, which are rapidly obtained and do not require any addition of other polymers or adhesives to render them handy before their introduction inside the muffler to be soundproofed.
- This new result is achieved by performing a movement with a compressed air jet, both in the vertical and the horizontal - or diagonal - direction, to obtain a continuous or discontinuous "seam" ("sewing line”) produced in the latter case by an intermittent air jet, this seam being obtained on the product after its extraction from the tube or reel-winder on which it was previously wound.
- this second embodiment of the present invention consists in a new method of manufacture of sound-absorbing mattress-like structures and it provides for various simple fabrication steps.
- the first of these steps is analogous to the corresponding one of the first embodiment and consists in winding a desired amount of glass fibre around a tube, or reel-winder, having a diameter equal to the distance between the baffles to be soundproofed.
- the aforesaid tube, or reel-winder which will be completely wrapped by the glass fibre mass, due to the rotation imparted to it in a conventional manner by any kind of motor (not shown), will have a length equal to the total circumference of the ducts to be soundproofed.
- the extraction ("unthreading") of the glass fibre mass thus wound around the tube or reel-winder will be facilitated by providing one or more slits on the tube, or by a superposition of lamellae or annular elements modifying (increasing) the diameter of the original tube.
- the extraction operation could also be facilitated by realizing the reel-winder with a slight taper.
- the second, innovative processing step which characterises the second embodiment and thereby renders it different from the first embodiment, consists in squeezing (compressing) the so obtained article of glass fibre while forcing the same to pass beneath one or more compressed air jets whose air pressure is within the region from 1 to 12 atmospheres (atm); the appropriate, selected value of pressure, depends on the Tex of the glass fibre which is comprised between 200 and 9600 Tex, and on the density of the fibre, all of which may vary according to the values specified by the customer.
- the number of compressed air jets and their position is directly related to the size of the "small mattress" to be packaged, and as a general rule it may be stated that the greater its size, the greater will be the number of air jets required.
- the complete absence of seams (sewing lines) and of gluing operations, in this second embodiment, allows the mattress-like structure of glass fibre to be extended - by applying a simple traction thereto - to an additional length of about one third of its initial total length, thereby increasing the efficiency and standardisation of the product.
- a glass fibre is wound around a tube or reel-winder (not shown) of adequate diameter; this manufacturing step does not differ from the corresponding one of the second embodiment of the invention. Therefore, the glass fibre (which then forms a "tube of glass fibre") is taken (extracted or “unthreaded”) from the respective tube or reel-winder, and the "tube of glass fibre” is subsequently squeezed (flattened).
- the two embodiments (methods) according to the present invention differ from each other, because in one case (first embodiment), depending on the size of the squeezed small mattress of glass fibre, one or more seams (sewing lines) 4 (cf.
- Fig. 1-3 in which a single sewing line is present will be provided on the small mattress 1, while in the other case (i.e. the second embodiment; cf. Figs. 4 and 5 ), the small mattress 1' will be "welded" by means of compressed air (causing mutual entanglement between individual threads of the fibre along the line indicated by 4').
- the small mattress or structure 1 or 1' can in both cases be easily handled by an operator, in order to realise a muffler for a vehicle with internal combustion engine, by winding the mattress on the ducts 2 (the latter are three in the illustrative drawings of Figs. 1-3 and 5 ). Notice that the space between the baffles 3 is entirely filled up by the glass fibre 1 or 1':
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Textile Engineering (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Exhaust Silencers (AREA)
- Nonwoven Fabrics (AREA)
- Glass Compositions (AREA)
Abstract
Description
- The present invention relates to the field of mufflers, specifically to mufflers for internal combustion engines.
- Until today the interior of mufflers having metallic sound-deadening enclosures, with either single or multiple, e.g. double, triple or quadruple ducts, has been filled with sound-deadening materials by means of classical pre-moulding or blowing methods. These already known methods can be carried out by employing several techniques that can be globally subdivided into two different groups. The first amounts to blowing-in a sound-deadening mass, usually formed of a thread of glass fibre, through a hole obtained on the external housing (or enclosure) of the muffler. The sound-deadening material is blown-in through the hole and fills the whole space between the individual ducts and the external metallic housing that encloses them. The second method consists in the application of a semi-rigid, sound absorbing, and adequately pre-moulded mass, within the muffler, before the latter is hermetically closed. However, both techniques have some drawbacks. The first one is not easily carried out due to the complexity of the blowing operation and to the time required for filling the body of the muffler. On the other hand, the second technique is decisively more expensive and therefore it is economically disadvantageous.
-
EP 0 074 220 discloses an insert for silencers, consisting of a central cylindrical former, an outer portion (surrounding said former) formed of a fibrous material in which the fibres are preferably basalt fibres, and an outer covering of sheet or scrim material. The former is formed from glass fibres mixed with an adhesive binder such as phenol (seeEP 0 074 220 , page 5, lines 27-29). The insert is formed by inserting a length of the fibrous material loosely around the former, placing the fibrous material and former into a loop of an endless belt, applying tension thereto, and rotating the endless belt to roll the fibrous material around the former and an outer covering of sheet or scrim material is then wrapped around the rolled insert to retain the shape thereof. - As a matter of fact, this process differs from the present application in that some parts of the insert are not glass fibres, use of an adhesive is made, and the shape of the insert is retained by additional means, such as the sheet material.
- Instead, the purpose of the present application is to noticeably simplify the fabrication of a silencer.
- The object of the present invention is to propose a method of introducing a glass fibre inside a muffler of an internal combustion engine whose muffler has an internal structure defined as "multiple duct structure".
- The inventive concept at the origin of the present invention is based on the principle of combining the advantages of the aforementioned techniques, without, however, be forced to accept their burdensome drawbacks. Therefore, the present invention intends to completely change the known techniques by providing a cheap product, that can be produced in large amounts with appropriate equipments and machines, and which further can be pre-packaged and is extremely easy to insert into the muffler before the latter is definitively closed. The sound absorbing material, i.e. the glass fibre, instead of being slowly blown into the muffler, will be directly and rapidly prepared in the factory in accordance with the technique of the present invention. A first phase of the method consists in winding, around a rotating tube or a reel-winder with a specific shape, the thread of glass fibre which will form the fmal hank (skein) 1 to be introduced into the muffler. Said tube or reel-winder, set in rotation around its axis by an electric motor, will give rise to a reel of glass fibre thread, and the diameter of this reel will be correlated to the distance between the internal baffles of the muffler that contain the discharge gas ducts. On the other hand, the length of the tube or reel-winder will be similar to the circumference of the total number of said (gas discharge) ducts to be soundproofed. Once a structure made of glass fibre has been obtained in accordance with the desired type of muffler, said structure or mass is simply taken manually from the tube or reel-winder on which it was wound, and then it is squeezed.
- According to a first embodiment of the invention, said squeezing of the sound-deadening mass is performed in order to allow an industrial sewing machine, of a type similar to the one used by shoemakers, to sew it in one or more parts, so that said mass will finally assume a substantially prismatic shape. The object of this central sewing (central seam) is to permit the handling of the glass fibre, by preventing the individual threads from falling down or getting entangled in an irregular manner before their introduction into the muffler and after their extraction from the tube on which they have been wound. The product, sewed in this manner, is ready to be introduced manually within the muffler, and it has a width and a length which are perfectly adapted to the space existing within the muffler to be soundproofed. After the product has been put in place, by simply winding it around the ducts located between the two baffles, the muffler can be simply closed and this can be done indifferently using a covering or an embedding technique, both for moulded or rolled muffler types. This can be done because the sound absorbing material processed according to the present invention does not at all protrude from the outer contour of the baffles.
- Moreover, according to a second embodiment, the present invention has the object to indicate a new, extremely practical, cheap and quick method of filling the mufflers of internal combustion engines with the sound deadening material. Said sound-deadening material is formed exclusively of glass fibre, without any addition of adhesives, additives, or other polymers used for welding or sewing purposes, or for gluing purposes, in order to facilitate the handling of the material before its insertion in place. These substances could in fact possibly give rise to toxic fumes at the elevated operation temperatures of the mufflers, or could require more complex manual operations in order to obtain a mattress-like structure of glass fibre to be introduced into the muffler. The present invention, in the form of its second embodiment, further improves the first embodiment by allowing the realisation of manufactured articles made of glass fibre, which are rapidly obtained and do not require any addition of other polymers or adhesives to render them handy before their introduction inside the muffler to be soundproofed. This new result is achieved by performing a movement with a compressed air jet, both in the vertical and the horizontal - or diagonal - direction, to obtain a continuous or discontinuous "seam" ("sewing line") produced in the latter case by an intermittent air jet, this seam being obtained on the product after its extraction from the tube or reel-winder on which it was previously wound. Also this second embodiment of the present invention consists in a new method of manufacture of sound-absorbing mattress-like structures and it provides for various simple fabrication steps. The first of these steps is analogous to the corresponding one of the first embodiment and consists in winding a desired amount of glass fibre around a tube, or reel-winder, having a diameter equal to the distance between the baffles to be soundproofed. The aforesaid tube, or reel-winder, which will be completely wrapped by the glass fibre mass, due to the rotation imparted to it in a conventional manner by any kind of motor (not shown), will have a length equal to the total circumference of the ducts to be soundproofed. The extraction ("unthreading") of the glass fibre mass thus wound around the tube or reel-winder, will be facilitated by providing one or more slits on the tube, or by a superposition of lamellae or annular elements modifying (increasing) the diameter of the original tube. The extraction operation could also be facilitated by realizing the reel-winder with a slight taper. The second, innovative processing step, which characterises the second embodiment and thereby renders it different from the first embodiment, consists in squeezing (compressing) the so obtained article of glass fibre while forcing the same to pass beneath one or more compressed air jets whose air pressure is within the region from 1 to 12 atmospheres (atm); the appropriate, selected value of pressure, depends on the Tex of the glass fibre which is comprised between 200 and 9600 Tex, and on the density of the fibre, all of which may vary according to the values specified by the customer.
- These focalised (concentrated) compressed air jets cause a mutual entanglement between the individual threads of glass fibre, thereby rendering extremely handy the so obtained mattress-like structure of glass fibre. This new method according to the second embodiment, due to the velocity with which the glass fibre can be made to slide beneath the compressed air jet(s), further reduces the manpower required for the job. This reduction allows to save one half of the required production time and it also increases safety on the production site, since the simple use of compressed air - acting as "glue" - in place of needles and adhesives makes the whole production extremely rapid, harmless, and cheap, due to the fact that no additional material is directly utilised in the product, apart from the glass fibre and compressed air. The number of compressed air jets and their position is directly related to the size of the "small mattress" to be packaged, and as a general rule it may be stated that the greater its size, the greater will be the number of air jets required. The complete absence of seams (sewing lines) and of gluing operations, in this second embodiment, allows the mattress-like structure of glass fibre to be extended - by applying a simple traction thereto - to an additional length of about one third of its initial total length, thereby increasing the efficiency and standardisation of the product.
- A further advantage of the present invention consists in providing industry with a "small mattress" of sound absorbing material which is realized, in a proportion of 100%, of glass fibre alone. This is advantageous both under the ecological and the bureaucratic viewpoint, since it avoids to be forced to provide the technical specific parameters required by the rigorous European anti-pollution regulations with respect to the materials added to the glass fibre roving (= continuous thread of glass fibre).
- The present invention will now be explained with reference to the drawings, which show two embodiments thereof, wherein:
-
Fig. 1 shows a small mattress or mattress-like structure consisting of a glass fibre, processed according to the method corresponding to the first embodiment of the present invention, before its winding around the ducts of a muffler of an internal combustion engine; -
Fig. 2 shows a muffler with three ducts, of an internal combustion engine, wherein the glass fibre sewed according to the first embodiment of the invention is wound between the two baffles; the mass of glass fibre (small mattress) is first fitted in the space between the individual ducts and then it is wound around them; -
Fig. 3 shows a muffler of an internal combustion engine, on whose ducts there has been applied - so as to perfectly occupy the space between the two baffles - the glass fibre (small glass fibre mattress) processed according to the first embodiment of the present invention; -
Fig. 4 shows a small, sound-absorbing mattress, or mattress-like structure, made of glass fibre, processed according to the method of the second embodiment of the present invention (which does not include a sewing step), that is, subjecting the small mattress to the action of compressed air; -
Fig. 5 is a perspective view of the muffler surrounded by the sound-deadening material (small mattress of glass fibre) which is wound around the muffler and is processed according to the second embodiment of the present invention; the figure shows the glass fibre and the ducts, besides the baffles between which the glass fibre is wound, the latter having a "welding line formed by compressed air". - The objects, the features, and the advantages of the present invention have already been illustrated in detail above.
- In substance, in the first embodiment of the invention, a glass fibre is wound around a tube or reel-winder (not shown) of adequate diameter; this manufacturing step does not differ from the corresponding one of the second embodiment of the invention. Therefore, the glass fibre (which then forms a "tube of glass fibre") is taken (extracted or "unthreaded") from the respective tube or reel-winder, and the "tube of glass fibre" is subsequently squeezed (flattened).
- From now on, the two embodiments (methods) according to the present invention differ from each other, because in one case (first embodiment), depending on the size of the squeezed small mattress of glass fibre, one or more seams (sewing lines) 4 (cf.
-
Fig. 1-3 , in which a single sewing line is present) will be provided on thesmall mattress 1, while in the other case (i.e. the second embodiment; cf.Figs. 4 and5 ), the small mattress 1' will be "welded" by means of compressed air (causing mutual entanglement between individual threads of the fibre along the line indicated by 4'). Thus, the small mattress orstructure 1 or 1' can in both cases be easily handled by an operator, in order to realise a muffler for a vehicle with internal combustion engine, by winding the mattress on the ducts 2 (the latter are three in the illustrative drawings ofFigs. 1-3 and5 ). Notice that the space between thebaffles 3 is entirely filled up by theglass fibre 1 or 1': - Although the second embodiment further speeds up and facilitates the manufacturing process with respect to the background art, a particular advantage, shared by both embodiments, is that the mass of glass fibre (1 or 1') does not include additional materials other than a glass fibre. In fact, preferably, the
sewing 4 of the first embodiment is entirely performed with glass fibre threads.
Claims (8)
- A method for filling with sound-deadening material the mufflers of internal combustion engines, said sound-deadening, or sound-absorbing material, being formed of glass fibre, wherein the method is characterized by including the following steps:- a thread of glass fibre is wound around a tube or a reel winder, in order to form a tubular mass of glass fibre, said tubular mass having a desired diameter correlated with, and similar to the distance between two baffles (3) confining the duct(s) to be soundproofed, and the length of said tubular mass of glass fibre being substantially equal to the length of the tube or reel-winder on which it is wound, and the latter length being in turn correlated to the total circumference of the duct(s) (2) to be wrapped; wherein, moreover, the amount of glass fibre used is specified according to the volume of the muffler to be filled up;- extraction of the tubular mass of glass fibre from the reel-winder or tube around which the respective thread of glass fibre was wound;- squeezing, that is flattening, of said tubular mass of glass fibre;- creation of one or more lines (4; 4') of irreversibly entangled or united glass fibres, these lines being obtained by sewing, or by ejecting compressed air jets through one or more nozzles, so as to produce a prefabricated mattress (1; 1') made of glass fibre, which is easy to handle, to transport, and is ready to be introduced into a muffler for its soundproofing;- winding of said mattress of glass fibre (1; 1') around the duct(s) (2) of the muffler;- closing of the muffler.
- A method according to claim 1, wherein said tube or reel-winder, on which the thread of glass fibre is wound, has means for facilitating the extraction or separation of the tubular, glass fibre mass, said means being for instance formed by a slit extending for example along about 2/3 of the length of said tube or reel-winder, the latter having a diameter equal to the distance between the inner baffles of the muffler and a length equal to the total circumference of the ducts (2) to be soundproofed.
- A method according to claim 1 or 2, characterised in that compressed air comes out of the duct(s) at a pressure not exceeding 12 atmospheres.
- A method according to claim 3, wherein the pressure of the compressed air coming out of at least one duct is comprised in the interval from 6 to 8 atmospheres.
- A method according to claim 3 or 4, wherein the compressed air jets come out of one or more ducts continuously or intermittently.
- A method according to any of the preceding claims, wherein the mattress of glass fibre (1') whose lines (4') of entanglement are obtained through compressed air jets, has the property of being extensible by no less than one third of its total length.
- A method according to any of the preceding claims, wherein the tube or reel-winder can be manually rotated around its own axis, or it can be driven by an electric motor, thereby speeding up the rotation and noticeably increasing the winding speed of the glass fibre.
- A method according to any of the preceding claims, wherein the sound absorbing material, consisting of glass fibre, is wound around the reel-winder or tube according to the specific technical features of the muffler to be soundproofed, that is, said material may have a diameter, consistence, and winding tension corresponding exactly to the required technical properties.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000107A ITRM20050107A1 (en) | 2005-03-10 | 2005-03-10 | MATTER MADE ENTIRELY IN FIBERGLASS. |
PCT/IT2006/000013 WO2006095373A1 (en) | 2005-03-10 | 2006-01-12 | Small mattress-like glass fibre structure and method for its manufacture |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1861592A1 EP1861592A1 (en) | 2007-12-05 |
EP1861592B1 true EP1861592B1 (en) | 2010-03-10 |
Family
ID=36148700
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06701623A Active EP1861592B1 (en) | 2005-03-10 | 2006-01-12 | Small mattress-like glass fibre structure and method for its manufacture |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1861592B1 (en) |
AT (1) | ATE460569T1 (en) |
DE (1) | DE602006012814D1 (en) |
IT (1) | ITRM20050107A1 (en) |
WO (1) | WO2006095373A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104033212A (en) * | 2014-06-11 | 2014-09-10 | 成都科力夫科技有限公司 | Anti-carbon muffler device |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011012202B4 (en) * | 2011-02-23 | 2014-09-25 | Dbw Holding Gmbh | Silencer insert for motor vehicles and method for the manufacture thereof |
DE102011012156A1 (en) | 2011-02-23 | 2012-08-23 | Dbw Holding Gmbh | Process for the preparation of a molding material made of fiber materials and apparatus therefor |
PL2602370T5 (en) | 2011-12-07 | 2019-03-29 | So.La.Is Societa' Lavorazione Isolanti S.R.L. A Socio Unico | Method and machine for producing a sound-deadening insert for silencer of an exhaust-gas discharge system of an internal-combustion engine |
ES2757807T3 (en) | 2014-08-05 | 2020-04-30 | So La Is Soc Lavorazione Isolanti S R L Con Unico Socio | Method and machine for producing a structured insert to acoustically and thermally isolate parts of vehicle components |
EP2990623B1 (en) | 2014-09-01 | 2018-11-07 | ISOLITE GmbH | Acoustic absorber |
ITUA20161725A1 (en) * | 2016-03-16 | 2017-09-16 | So La Is Soc Lavorazione Isolanti S R L Con Unico Socio | METHOD FOR REALIZING A FIBER MATTRESS TO ACOUSTICALLY AND / OR THERMICALLY INSULATE A COMPONENT OF A MOTOR VEHICLE |
CN111434900A (en) * | 2019-01-14 | 2020-07-21 | 郑州宇通客车股份有限公司 | Detachable perforated silencer |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE517282A (en) * | 1952-01-30 | |||
GB2106591B (en) * | 1981-08-26 | 1985-09-11 | Lancaster Glass Fibre | Fibrous insert for an i c engine exhaust silencer |
JP3670732B2 (en) * | 1995-10-24 | 2005-07-13 | 大成建設株式会社 | Simple soundproof wall for construction site and sound insulation method |
DE29807858U1 (en) * | 1998-05-01 | 1998-08-27 | Goertz, Johannes Ulrich, 41334 Nettetal | Silencer inserts made of textured glass yarn |
JP2003106133A (en) * | 2001-09-28 | 2003-04-09 | Nippon Glass Fiber Kogyo Kk | Muffler of internal combustion engine |
-
2005
- 2005-03-10 IT IT000107A patent/ITRM20050107A1/en unknown
-
2006
- 2006-01-12 DE DE602006012814T patent/DE602006012814D1/en active Active
- 2006-01-12 AT AT06701623T patent/ATE460569T1/en not_active IP Right Cessation
- 2006-01-12 WO PCT/IT2006/000013 patent/WO2006095373A1/en not_active Application Discontinuation
- 2006-01-12 EP EP06701623A patent/EP1861592B1/en active Active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104033212A (en) * | 2014-06-11 | 2014-09-10 | 成都科力夫科技有限公司 | Anti-carbon muffler device |
Also Published As
Publication number | Publication date |
---|---|
EP1861592A1 (en) | 2007-12-05 |
DE602006012814D1 (en) | 2010-04-22 |
ITRM20050107A1 (en) | 2006-09-11 |
WO2006095373A1 (en) | 2006-09-14 |
ATE460569T1 (en) | 2010-03-15 |
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