WO2002090803A1 - Stopfbuchspackung und verfahren zu ihrer herstellung - Google Patents
Stopfbuchspackung und verfahren zu ihrer herstellung Download PDFInfo
- Publication number
- WO2002090803A1 WO2002090803A1 PCT/EP2002/002679 EP0202679W WO02090803A1 WO 2002090803 A1 WO2002090803 A1 WO 2002090803A1 EP 0202679 W EP0202679 W EP 0202679W WO 02090803 A1 WO02090803 A1 WO 02090803A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sealing element
- active ingredient
- nonwoven
- stuffing box
- impregnated
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/18—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings
- F16J15/20—Packing materials therefor
- F16J15/22—Packing materials therefor shaped as strands, ropes, threads, ribbons, or the like
Definitions
- the invention relates to a stuffing box packing made of a nonwoven fabric impregnated with an active ingredient, in particular PTFE, as a press-in sealing element in an annular gap between a stationary and a moving machine part, and a method for producing such a stuffing box packing.
- an active ingredient in particular PTFE
- Stuffing boxes often consist of special cord or braid rings, extruded rings or pressed rings.
- Graphite, PTFE, fiber materials, carbon, metal or corresponding combinations thereof are mostly used as packing materials.
- the fiber materials can also be provided with special impregnations.
- PTFE has established itself as a material for stuffing box packings that require high chemical resistance in combination with good sealing and friction properties at high temperatures.
- the production of the PTFE stuffing box packing is relatively complex, especially when PTFE game is braided into a packing strand.
- the invention has for its object to provide a stuffing box packing which has a high sealing behavior with very good friction properties.
- the sealing element consists of at least two radially wrapped and compressed layers of a nonwoven fabric impregnated with the active ingredient.
- a nonwoven band is consequently used according to the invention, which is wound into several layers in the radial direction and then pressed.
- the beginning of the winding of the first layer and the end of the winding of the last layer of the nonwoven tape lie one above the other with their cut edges, so that no thickening or the like occurs in the finished pressed sealing element. It is particularly advantageous if the cut edges are provided with sloping edges and in this way a uniform thickness is already present on the entire circumference of the sealing element during the winding process.
- the number of layers can vary from a minimum of 2 to a maximum of 200.
- the nonwoven fabric has a high degree of openness and porosity.
- the nonwoven is a mechanically bonded nonwoven made of aramid fibers, with a fiber length of 3 to 20 mm and a basis weight of 20 to 200 g / m 2 .
- the short fiber length leads to strong porosity.
- the aramid fibers are particularly suitable for use at high temperatures.
- the nonwoven fabric is bound mechanically, eg by hydroentangling or needles. Mechanical strengthening is important in that, in contrast to a chemical bond, it has high stability even at high temperatures.
- a method is used in which a mechanically bonded nonwoven web made of fibers with a fiber length of 3 to 100 mm with an active ingredient impregnated and then dried and then cut into individual cut nonwoven strips, the width of which is 1.5 to 5 times the predetermined height of the sealing element and in which the nonwoven strips are individually wound onto a mandrel and pressed to the sealing element in a pressing device become.
- the width of the nonwoven strips depends on the later circumstances, in particular on the hardness of the sealing element of the stuffing box packing.
- the pressing pressure in the pressing device also depends on this. The higher the desired hardness of the sealing element, the higher the pressure is chosen and the larger the width of the nonwoven strips.
- the nonwoven web itself has a thickness of ⁇ 2.5 mm, preferably from 0.5 to 1.25 mm.
- the length of time in the impregnation bath depends on the desired degree of impregnation and the active ingredient used.
- the active ingredient preferably consists of an aqueous PTFE dispersion or an aqueous PTFE dispersion with fillers.
- the impregnated nonwoven web is preferably dried in a continuous oven at a temperature of about 30 to 300.degree.
- the nonwoven web is usually soaked to the maximum degree of saturation, ie up to approximately 95-98% active ingredient.
- the impregnation can be partially pressed out of the nonwoven web in a downstream stripping section between two rollers.
- the axial pressing pressure in the pressing device is 5 to 50 MPa. Tests have shown that this pressure leads to a good internal compression of the packing material and at the same time good material-related cohesion of the impregnated nonwoven strips is achieved. Depending on the desired degree of compaction, the pressing time is a few seconds up to 2 min. Higher compression pressures generally lead to very hard sealing elements, which require very high stuffing box forces for sealing when later being installed in the stuffing box.
- the pressed sealing element is subjected to a sintering treatment at elevated temperature and pressure.
- Fig. 2 shows the sealing element of FIG. 1 in cross section
- Fig. 3 shows the pressing device with inserted sealing element in section.
- the sealing element 1 serving as a stuffing box packing is shown in plan view.
- the sealing element 1 consists of three layers 2, 3 and 4, which are wound radially around one another, from a nonwoven web impregnated with an active ingredient.
- the start of winding 10 of the first layer 2 and the end of winding 11 of the last layer 4 of the nonwoven web lie with their cut edges 12 and 13 one above the other.
- the cut edges 12 and 13 are provided with sloping edges.
- 14 shows a sectional area through the sealing element 1.
- the sealing element 1 is divided in the axial direction in order to facilitate its lateral attachment to the shaft to be sealed, in which the sealing element 1 can be bent apart here.
- FIG. 2 shows a cross section through the sealing element 1 according to AA of FIG. 1.
- the individual layers 2 to 4 are visible in their radial alignment.
- 3 shows the pressing device 20 in which the impregnated, prepared sealing element 1 is pressed.
- the pressing device 20 consists of the die 21 with the core 22 and the jacket 23 and the punch 24.
- the sealing element 1 consisting of layers 2 to 8 is inserted in the present case , as shown on the left side of the figure.
- the stamp 24 is pressed axially into the opening 25. This results in the sealing element 1 being compressed, as shown on the right-hand side of the figure.
- the axial pressure causes the inner layer 2 and the outer layer 8 of the sealing element 1 to have a particularly smooth structure on their inner and outer surfaces. This is important for the subsequent sealing process as a stuffing box packing. At the same time, as is shown in the drawing by the zigzag-shaped configuration of the layers 3 to 7, good interlocking of the layers with one another is achieved.
- the sealing element 1 is removed from the pressing device 20 and can be used as a stuffing box packing.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Devices (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002446268A CA2446268C (en) | 2001-05-07 | 2002-03-12 | Gland packing and method for its manufacture |
EP02722205A EP1386101A1 (de) | 2001-05-07 | 2002-03-12 | Stopfbuchspackung und verfahren zu ihrer herstellung |
JP2002587832A JP4310110B2 (ja) | 2001-05-07 | 2002-03-12 | グランドパッキン及びその製造方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2001122094 DE10122094B4 (de) | 2001-05-07 | 2001-05-07 | Stopfbuchspackung aus einem Dichtelement und Verfahren zu seiner Herstellung |
DE10122094.4 | 2001-05-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002090803A1 true WO2002090803A1 (de) | 2002-11-14 |
Family
ID=7683876
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2002/002679 WO2002090803A1 (de) | 2001-05-07 | 2002-03-12 | Stopfbuchspackung und verfahren zu ihrer herstellung |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1386101A1 (de) |
JP (1) | JP4310110B2 (de) |
CN (1) | CN100339615C (de) |
CA (1) | CA2446268C (de) |
DE (1) | DE10122094B4 (de) |
WO (1) | WO2002090803A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1473493A2 (de) * | 2003-04-30 | 2004-11-03 | Carl Freudenberg KG | Dichtungsanordnung |
WO2019183631A1 (en) * | 2018-03-23 | 2019-09-26 | A.W. Chesterton Company | Packing material cartridge |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10250264B4 (de) * | 2002-10-28 | 2005-07-28 | Carl Freudenberg Kg | Dichtungsmaterial für Stopfbuchspackungen |
DE10315333B4 (de) * | 2003-04-03 | 2005-10-27 | Carl Freudenberg Kg | Dichtung |
DE10349414B4 (de) * | 2003-10-21 | 2006-03-23 | Carl Freudenberg Kg | Verfahren zur Herstellung von Formkörpern aus vliesstoffverstärktem PTFE |
CA2788086A1 (en) * | 2010-01-14 | 2011-07-21 | List Holding Ag | A vacuum devolatilizer |
CN101881333B (zh) * | 2010-06-23 | 2013-11-20 | 西峡县金方圆密封材料有限责任公司 | 一种无接口编织密封环及其生产方法、专用设备 |
CN104847894A (zh) * | 2014-07-15 | 2015-08-19 | 北汽福田汽车股份有限公司 | 一种平面密封方法 |
CN109282037A (zh) * | 2018-12-03 | 2019-01-29 | 合盛硅业股份有限公司 | 一种用于真空密炼机的轴封装置 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US326593A (en) * | 1885-09-22 | William t | ||
US3890183A (en) * | 1969-07-09 | 1975-06-17 | Farnam Co F D | Method of making gaskets and products formed thereby |
EP0517088A1 (de) * | 1991-06-05 | 1992-12-09 | Ditec Marketing Ag | Verfahren zur Herstellung von Ringen aus Reingraphitfolien und nach dem Verfahren hergestellte Ringe |
DE4423043A1 (de) | 1994-07-01 | 1996-01-11 | Inst Textil & Verfahrenstech | Stopfbuchspackung |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB760446A (en) * | 1953-08-25 | 1956-10-31 | Paul Kind | Improvements in or relating to stuffing box packing |
DE2444502A1 (de) * | 1974-09-18 | 1976-04-01 | Freudenberg Carl Fa | Dichtung |
CN87200526U (zh) * | 1987-01-22 | 1987-11-04 | 北京化工学院 | 釜用耐腐蚀机械密封 |
CN2173251Y (zh) * | 1993-11-15 | 1994-08-03 | 慈溪市高能密封件研究所 | 填充四氟线 |
CN1033648C (zh) * | 1994-08-16 | 1996-12-25 | 于建立 | 一种密封材料及其制备方法 |
-
2001
- 2001-05-07 DE DE2001122094 patent/DE10122094B4/de not_active Expired - Lifetime
-
2002
- 2002-03-12 CN CNB028094743A patent/CN100339615C/zh not_active Expired - Lifetime
- 2002-03-12 EP EP02722205A patent/EP1386101A1/de not_active Withdrawn
- 2002-03-12 WO PCT/EP2002/002679 patent/WO2002090803A1/de active Application Filing
- 2002-03-12 JP JP2002587832A patent/JP4310110B2/ja not_active Expired - Fee Related
- 2002-03-12 CA CA002446268A patent/CA2446268C/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US326593A (en) * | 1885-09-22 | William t | ||
US3890183A (en) * | 1969-07-09 | 1975-06-17 | Farnam Co F D | Method of making gaskets and products formed thereby |
EP0517088A1 (de) * | 1991-06-05 | 1992-12-09 | Ditec Marketing Ag | Verfahren zur Herstellung von Ringen aus Reingraphitfolien und nach dem Verfahren hergestellte Ringe |
DE4423043A1 (de) | 1994-07-01 | 1996-01-11 | Inst Textil & Verfahrenstech | Stopfbuchspackung |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1473493A2 (de) * | 2003-04-30 | 2004-11-03 | Carl Freudenberg KG | Dichtungsanordnung |
EP1473493A3 (de) * | 2003-04-30 | 2004-12-01 | Carl Freudenberg KG | Dichtungsanordnung |
WO2019183631A1 (en) * | 2018-03-23 | 2019-09-26 | A.W. Chesterton Company | Packing material cartridge |
EP3768997A4 (de) * | 2018-03-23 | 2021-12-22 | A.W. Chesterton Company | Verpackungsmaterialpatrone |
Also Published As
Publication number | Publication date |
---|---|
CN100339615C (zh) | 2007-09-26 |
JP2004525320A (ja) | 2004-08-19 |
CA2446268C (en) | 2008-12-09 |
CA2446268A1 (en) | 2002-11-14 |
JP4310110B2 (ja) | 2009-08-05 |
DE10122094A1 (de) | 2002-12-19 |
EP1386101A1 (de) | 2004-02-04 |
DE10122094B4 (de) | 2006-04-27 |
CN1507545A (zh) | 2004-06-23 |
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