US3825412A - Production of pipe bend sheaths - Google Patents

Production of pipe bend sheaths Download PDF

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Publication number
US3825412A
US3825412A US00224736A US22473672A US3825412A US 3825412 A US3825412 A US 3825412A US 00224736 A US00224736 A US 00224736A US 22473672 A US22473672 A US 22473672A US 3825412 A US3825412 A US 3825412A
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United States
Prior art keywords
sheaths
longitudinal
pipe bend
sheet
hills
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.)
Expired - Lifetime
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US00224736A
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English (en)
Inventor
G Mullender
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Individual
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Individual
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Filing date
Publication date
Priority claimed from DE19712107068 external-priority patent/DE2107068C/de
Application filed by Individual filed Critical Individual
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Publication of US3825412A publication Critical patent/US3825412A/en
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Expired - Lifetime legal-status Critical Current

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    • 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
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
    • F16L59/10—Bandages or covers for the protection of the insulation, e.g. against the influence of the environment or against mechanical damage
    • F16L59/11—Rigid covers for elbows
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4935—Heat exchanger or boiler making
    • Y10T29/49391—Tube making or reforming
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49789—Obtaining plural product pieces from unitary workpiece
    • Y10T29/49794—Dividing on common outline
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12188—All metal or with adjacent metals having marginal feature for indexing or weakened portion for severing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12229—Intermediate article [e.g., blank, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/1241—Nonplanar uniform thickness or nonlinear uniform diameter [e.g., L-shape]
    • Y10T428/12417—Intersecting corrugating or dimples not in a single line [e.g., waffle form, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24628—Nonplanar uniform thickness material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24628—Nonplanar uniform thickness material
    • Y10T428/24669—Aligned or parallel nonplanarities
    • Y10T428/24686—Pleats or otherwise parallel adjacent folds
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24628—Nonplanar uniform thickness material
    • Y10T428/24669—Aligned or parallel nonplanarities
    • Y10T428/24694—Parallel corrugations

Definitions

  • This invention relates to the production of sheaths for objects having a generally pipe bend shaped outer surface defined by curved inner and outer bend sections, and more particularly to the production of pipe bend sheaths which are used for covering themial insulation, such as foam material, laid on pipes or tubes to be insulated, especially in central heating systems.
  • sheaths A particular form of such sheaths, and their production, is the subject of my co-pending application whereas the present application Ser. No. 224,889 is concerned with the production of a variety of sheaths, not limited to that particular form, and is based on an intermediate product, comprising a specially shaped sheet of flexible resiliently deformable material, such as a plastic or metal foil or film, from which sheaths can economically be divided.
  • a corrugated sheet for example, a corrugated sheet, for example, a corrugated sheet, for example, a corrugated sheet, for example, a corrugated sheet, for example, a corrugated sheet, for example, a corrugated sheet, for example, a corrugated sheet, for example, a corrugated sheet, for example, a corrugated sheet, for example, a corrugated sheet, for example, a corrugated sheet, for
  • each row of corrugations in the longitudinal direction having a regularly sinuous profile of substantially semicircular alternating hills and valleys, as seen from either face of the sheet, and each row of corrugations in the transverse direction having a form which, as seen from one face of the sheet, appears as substantially quadrantal hills altemating with V-shaped valleys and, as seen from the other face of the sheet, appears as substantially quadrantal valleys alternating with inverted or saddleback pass shaped hills.
  • the method in accordance with the invention of producing sheaths comprises cutting a corrugated sheet, as defined above, longitudinally and transversely into pieces each of which comprises in longitudinal extent substantially the equivalent of -a semicircular hill plus a semicircular valley so that each piece can be resiliently deformed into an annulus of pipe bend shape.
  • FIGS. la to 0 show in plan, longitudinal section and transverse section respectively a corrugated sheet in accordance with the invention
  • FIGS. 2a and b show in plan and side elevation respectively a longitudinal row of corrugations cut from the sheet of FIGS. la to c, and
  • FIGS. 3, 4, 5 and 6 are longitudinal sections of part of a row of corrugations, corresponding to part of FIG. lb or FIG. 2b, illustrating modifications.
  • FIG. la shows in plan an embossed corrugated sheet formed, by a pressing or other moulding process, from a plane sheet of foil.
  • This forming is carried out in such a way that there are produced transverse undulating corrugations 30, 32 and longitudinal undulating corrugations 31, 33 which succeed one another periodically and symmetrically in parallel rows which mutually intersect in the transverse and longitudinal directions.
  • the result is that, as seen from either face of the sheet, longitudinal rows of convex corrugation hills, 34 or 37, and concave corrugation valleys, 35 or 36, are produced, are all substantially semicircular as seen in longitudinal section and adjoin one another in continuous transition.
  • the semicircles correspond in diameter to the pipe diameter of the closed annulus form of the pipe bend sheaths to be produced. This diameter is substantially that of the pipe, including its insulation, to be covered.
  • the rows' of corrugation hills 34, 37 and corrugation valleys 35, 36 have the profile of quarter-circles interconnected by straight parts 42, 43 which correspond to the ends of the pipe bend shape, to connect with adjacent straight lengths of pipe sheathing.
  • the corrugation valleys 35,36 correspond, 'when eventually inverted, to the throats or inner sides of the bends of eventual sheaths and the corrugation hills 34, 37 eventually form the outer sides of the bends of eventual sheaths.
  • FIG. lb which is a section along the line II in FIG. la, there can be seen one side of one longitudinal row of corrugations.
  • FIG. 1c which is a section on the line IIH in FIG. la, there can be seen one side of a transverse row of corrugations.
  • FIG. lb Longitudinally, as shown by FIG. lb, altemately' convex and concave semicircles adjoin one another to form regular rows of hills and valleys as seen from either side of the sheet.
  • successively large and small quarter-circles are interconnected by straight parts 42, 43 so that each transverse row of corrugations appears, from one face of the sheet, as alternating quadrantal hills and V-shaped valleys and, from the other face, as alternating quadrantal valleys and inverted V or saddleback pass shaped hills.
  • each longitudinal strip of corrugations, having been cut, through 42 and 43, in mutuallyv perpendicular planes intersecting along the axis of the strip, consists of a quadrantal sector of a hollow body of: sinuous profile.
  • the individual sheaths are now separated from these rows of corrugations by cutting the strips across.
  • each intervening piece 72 constitutes a pipe bend sheath in an opened shape having the form of a quadrantal sector of a hollow body of open-ended hour-glass form as can be seen in FIG. 2a.
  • the convex ends are drawn towards one another so as. to invert the corrugation valley, or waist portion of the hour-glass shape, the ends closing together to form the outer side of the pipe bend and the corrugation valley or waist portion the throat thereof.
  • the sheath material Due to the embossing of the original sheet, the sheath material is stressed so that it is resiliently stable in both the opened, hour-glass, shape and in the closed, pipe-bend, shape into which it will snap automatically when the valley or waist portion is inverted.
  • This form of sheath is described in more detail in my above-mentioned co-pending application and need not be more fully described in this application which is concerned with the production of sheaths including, but not limited to, that form of sheath.
  • each intervening piece 75 has the shape somewhat of a helmet or Dutch bonnet. If the ends 80 and 81 of a piece 75 are then drawn together they will invert and meet or overlap to form the throat of a pipe bend sheath whilst the hill portion between them forms the outer side of the bend.
  • a' longitudinal strip as shown by FIGS. 2a and b can be cut across its hills or valleys into pieces each of which comprises in longitudinal extent substantially I the equivalent of a semicircular hill plus a semicircular valley so that each piece can be resiliently deformed into an annulus of pipe-bend shape.
  • the dividing cuts are so positioned that the ends of each piece produced will overlap in the closed shape, either at the outside of the bend for a piece such as 72 or at the throat of the bend for a piece such as 75.
  • the convex end portion of the piece 72 cut off at 71 is somewhat longer than the other end. Only a small difference is required and the positions of the cuts can change progressively along a row so that only occasionally a small longitudinal piece, of less than sheath length, need be discarded.
  • the corrugated strips may be cut obliquely, such as at 76 and 77, to produce sheath pieces, such as 78, of which the ends inversely vary in length transversely.
  • the oblique ends can, when the sheath is turned to closed shape, meet with an oblique butt joint or, by a slight helical conformation of the closed sheath, the oblique ends can be caused to overlap.
  • each corrugated strip will be divided into similar pieces by similarly located straightor oblique transverse cuts, with any slight variation to obtain overlap, so as to avoid waste by pieces of incomplete sheath size being left between adjacent cuts. It may however be possible to change from a series of cuts of one kind, such as 70, 71, to another kind, such as 73, 74, by progressive shift in longitudinal position of the cuts.
  • the embossed shape of the production sheet can be modified so as locally to increase the longitudinal dimensions of the eventual ends of sheaths and thus provide for overlap.
  • the necessary local dimensional increase can be provided by cusps in the curvature of the longitudinal hills or valleys at transverse dividing lines defined by transverse indentations or ridges respectively.
  • the crests or peaks of longitudinal hills, such as 34 in FIG. lb, are bulged slightly on either side of a transverse cusp 90 which crosses adjacent valleys, such as 35, which ap pear as hills from the other side of the sheet.
  • the cusp 90 may change from one face of the sheet to the other so as to appear as an indentation or as a ridge at the eventual dividing cut for the respective strip of corrugations.
  • the moulding may however be such that transverse ridges are formed across longitudinal valleys as shown by the cusp 91 in FIG. 4. If dividing cuts are made at ridges, such as at 91, the intervening-pieces are of helmet or Dutch bonnet shape and, when closed, overlap at the throats of their pipe sheath bends.
  • sheaths which are all of the same shape, i.e., all of the hour-glass shape such as 72 or all of the helmet shape such as 75, then only short transverse cusps need be formed transversely within each longitudinal row, i.e., eventual strip, of corrugations.
  • the cusps required for helmet-type pieces are shown at 92 and 93 in FIG. 5, and by corresponding thick chain lines in FIG. la, extending transversely within valleys 35' and 36 of adjacent longitudinal strip rows of corrugations from which will be cut sheaths which overlap their ends at the throats of bends.
  • transverse cusps 94 and 95 are made across the crests or peaks of hills 34' and 37 of adjacent longitudinal strip rows of corrugations from which will be cut sheaths which overlap their ends at the outer side of bends.
  • Sheets which are corrugated for division into pipe bend sheaths as described above may be moulded from any suitable flexible resiliently deformable material such as plastics foil or film or metal sheet or foil.
  • sheaths may be produced in a factory by successive sheet-forming and dividing operations or corrugated sheets may be produced as intermediate products manufactured as articles for sale to factors or other users who can divide the sheets into sheaths.
  • a corrugated sheet useful as an intermediary productin the production of sheaths for objects having a generally pipe bend shaped external surface defined by curved inner and outer. bend sections comprising:
  • a first plurality of elongated segments each being of a thin, flexible resiliently deformable material having an undulating configuration defining alternate quadrantal hills and substantially V-shaped valleys along a longitudinal axis and having a semicircular hill-shaped cross section in a direction transverse to the longitudinal axis;
  • a second plurality of elongated segments each being of a thin, flexible resiliently deformable material having an undulating configuration defining alternate quadrantal valleys and inverted V-shaped hills along a longitudinal axis and having a semicircular valley-shaped cross section in a direction transverse to the longitudinal axis;
  • V-shaped valleys and inverted V-shaped hills each having a curvature which is substantially equal to a curvature conforming to the inner bend section;
  • the quadrantal hills and quadrantal valleys each having a curvature which is substantially equal to a curvature conforming to the outer bend section;
  • said first and second pluralities of elongated segments being adjacently positioned with their longitudinal axis in a side-by-side parallel array in alternating fashion and being arranged such that the inverted V-shaped hills are centrally aligned with the having ends which will overlap when closed in pipe bend shape.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
US00224736A 1971-02-15 1972-02-09 Production of pipe bend sheaths Expired - Lifetime US3825412A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712107068 DE2107068C (de) 1971-02-15 Verfahren zum Herstellen von Folienbögen aus elastischem Material zum Umkleiden von Rohrkrümmern

Publications (1)

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US3825412A true US3825412A (en) 1974-07-23

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US00224736A Expired - Lifetime US3825412A (en) 1971-02-15 1972-02-09 Production of pipe bend sheaths

Country Status (11)

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US (1) US3825412A (enExample)
AT (1) AT319672B (enExample)
AU (1) AU461275B2 (enExample)
BE (1) BE778963A (enExample)
CA (1) CA952660A (enExample)
CH (1) CH547669A (enExample)
FR (1) FR2125284B1 (enExample)
GB (1) GB1380809A (enExample)
IT (1) IT947557B (enExample)
LU (1) LU64676A1 (enExample)
NL (1) NL7201987A (enExample)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4748838A (en) * 1987-05-18 1988-06-07 W. R. Grace & Co. Process for making obliquely corrugated thin metal strips
US20110042035A1 (en) * 2009-08-19 2011-02-24 Alstom Technology Ltd Heat transfer element for a rotary regenerative heat exchanger
US20140212629A1 (en) * 2013-01-28 2014-07-31 Yazaki Corporation Sheathing material
US10094626B2 (en) 2015-10-07 2018-10-09 Arvos Ljungstrom Llc Alternating notch configuration for spacing heat transfer sheets
US10175006B2 (en) 2013-11-25 2019-01-08 Arvos Ljungstrom Llc Heat transfer elements for a closed channel rotary regenerative air preheater
US10197337B2 (en) 2009-05-08 2019-02-05 Arvos Ljungstrom Llc Heat transfer sheet for rotary regenerative heat exchanger
US10378829B2 (en) 2012-08-23 2019-08-13 Arvos Ljungstrom Llc Heat transfer assembly for rotary regenerative preheater
US10914527B2 (en) 2006-01-23 2021-02-09 Arvos Gmbh Tube bundle heat exchanger
US12480160B2 (en) 2015-05-22 2025-11-25 Medicover Public Co Ltd Multiplexed parallel analysis of targeted genomic regions for non-invasive prenatal testing

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK44194A (da) * 1994-04-15 1995-10-16 Rasmussen Kann Ind As Deformerbart plademateriale, navnlig til taginddækningsformål, og fremgangsmåde til fremstilling af et sådant materiale
CN105065859B (zh) * 2015-07-27 2017-10-13 中国核动力研究设计院 一种核级设备及管道用金属反射型保温层

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US183926A (en) * 1876-10-31 Improvement in stove-pipe elbows
US229331A (en) * 1880-06-29 John w
US662567A (en) * 1900-04-25 1900-11-27 Isabella Von Lipowska Metal bearing-plate.
US1566768A (en) * 1925-12-22 Method of making elbows from sheet metal
US2003538A (en) * 1932-10-06 1935-06-04 Daniel W Hickey Pipe elbow
US2152297A (en) * 1937-01-07 1939-03-28 Lumasyne Inc Sheet metal stock for paneling and other purposes
US3003599A (en) * 1955-03-02 1961-10-10 Ind Dev Co Construction elements

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US183926A (en) * 1876-10-31 Improvement in stove-pipe elbows
US229331A (en) * 1880-06-29 John w
US1566768A (en) * 1925-12-22 Method of making elbows from sheet metal
US662567A (en) * 1900-04-25 1900-11-27 Isabella Von Lipowska Metal bearing-plate.
US2003538A (en) * 1932-10-06 1935-06-04 Daniel W Hickey Pipe elbow
US2152297A (en) * 1937-01-07 1939-03-28 Lumasyne Inc Sheet metal stock for paneling and other purposes
US3003599A (en) * 1955-03-02 1961-10-10 Ind Dev Co Construction elements

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4748838A (en) * 1987-05-18 1988-06-07 W. R. Grace & Co. Process for making obliquely corrugated thin metal strips
US10914527B2 (en) 2006-01-23 2021-02-09 Arvos Gmbh Tube bundle heat exchanger
US10982908B2 (en) 2009-05-08 2021-04-20 Arvos Ljungstrom Llc Heat transfer sheet for rotary regenerative heat exchanger
US10197337B2 (en) 2009-05-08 2019-02-05 Arvos Ljungstrom Llc Heat transfer sheet for rotary regenerative heat exchanger
US20110042035A1 (en) * 2009-08-19 2011-02-24 Alstom Technology Ltd Heat transfer element for a rotary regenerative heat exchanger
US8622115B2 (en) * 2009-08-19 2014-01-07 Alstom Technology Ltd Heat transfer element for a rotary regenerative heat exchanger
US9448015B2 (en) 2009-08-19 2016-09-20 Arvos Technology Limited Heat transfer element for a rotary regenerative heat exchanger
US10378829B2 (en) 2012-08-23 2019-08-13 Arvos Ljungstrom Llc Heat transfer assembly for rotary regenerative preheater
US11092387B2 (en) 2012-08-23 2021-08-17 Arvos Ljungstrom Llc Heat transfer assembly for rotary regenerative preheater
US20140212629A1 (en) * 2013-01-28 2014-07-31 Yazaki Corporation Sheathing material
US9106060B2 (en) * 2013-01-28 2015-08-11 Yazaki Corporation Sheathing material
US10175006B2 (en) 2013-11-25 2019-01-08 Arvos Ljungstrom Llc Heat transfer elements for a closed channel rotary regenerative air preheater
US12480160B2 (en) 2015-05-22 2025-11-25 Medicover Public Co Ltd Multiplexed parallel analysis of targeted genomic regions for non-invasive prenatal testing
US10094626B2 (en) 2015-10-07 2018-10-09 Arvos Ljungstrom Llc Alternating notch configuration for spacing heat transfer sheets

Also Published As

Publication number Publication date
AU3896172A (en) 1973-08-16
BE778963A (fr) 1972-08-03
AT319672B (de) 1975-01-10
DE2107068B2 (de) 1972-07-13
IT947557B (it) 1973-05-30
CH547669A (de) 1974-04-11
GB1380809A (en) 1975-01-15
LU64676A1 (enExample) 1972-06-26
CA952660A (en) 1974-08-13
NL7201987A (enExample) 1972-08-17
FR2125284B1 (enExample) 1973-06-29
DE2107068A1 (enExample) 1972-07-13
FR2125284A1 (enExample) 1972-09-29
AU461275B2 (en) 1975-05-22

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