US3673839A - Method of manufacturing a foil material embossed on both sides,a roll nip and a machine for carrying out the method - Google Patents

Method of manufacturing a foil material embossed on both sides,a roll nip and a machine for carrying out the method Download PDF

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Publication number
US3673839A
US3673839A US62850A US3673839DA US3673839A US 3673839 A US3673839 A US 3673839A US 62850 A US62850 A US 62850A US 3673839D A US3673839D A US 3673839DA US 3673839 A US3673839 A US 3673839A
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United States
Prior art keywords
roll
projections
projection
rolls
foil material
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Expired - Lifetime
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US62850A
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English (en)
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Ole Nielsen
Max Beidil
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/18—Thermoforming apparatus
    • B29C51/20—Thermoforming apparatus having movable moulds or mould parts
    • B29C51/22—Thermoforming apparatus having movable moulds or mould parts rotatable about an axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/07—Embossing, i.e. producing impressions formed by locally deep-drawing, e.g. using rolls provided with complementary profiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/08—Deep drawing or matched-mould forming, i.e. using mechanical means only
    • B29C51/082—Deep drawing or matched-mould forming, i.e. using mechanical means only by shaping between complementary mould parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00—Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07—Embossing
    • B31F2201/0707—Embossing by tools working continuously
    • B31F2201/0715—The tools being rollers
    • B31F2201/0723—Characteristics of the rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00—Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07—Embossing
    • B31F2201/0707—Embossing by tools working continuously
    • B31F2201/0715—The tools being rollers
    • B31F2201/0723—Characteristics of the rollers
    • B31F2201/0733—Pattern
    • B31F2201/0735—Pattern inclined with respect to the axis of the roller
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00—Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07—Embossing
    • B31F2201/0707—Embossing by tools working continuously
    • B31F2201/0715—The tools being rollers
    • B31F2201/0723—Characteristics of the rollers
    • B31F2201/0738—Cross sectional profile of the embossments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00—Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07—Embossing
    • B31F2201/0707—Embossing by tools working continuously
    • B31F2201/0715—The tools being rollers
    • B31F2201/0741—Roller cooperating with a non-even counter roller
    • B31F2201/0743—Roller cooperating with a non-even counter roller having a matching profile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00—Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07—Embossing
    • B31F2201/0707—Embossing by tools working continuously
    • B31F2201/0715—The tools being rollers
    • B31F2201/0753—Roller supporting, positioning, driving means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00—Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07—Embossing
    • B31F2201/0782—Layout of the complete embossing machine, of the embossing line

Definitions

  • the invention relates to a method of manufacturing a foil material embossed on both sides by inserting the original foil material in the roll nip between two rolls, the surfaces of the latter being provided with projections in such a manner that a projection on each of the rolls is, in the roll nip, surrounded on all sides by projections of the other roll, and where each of the projections on a roll is axially displaced relative to the peripherally adjacent projections on the same roll, and where projections on one roll together with alternating corresponding projections on the other roll from straight lines substantially parallel to the axes of the rolls.
  • a method of the type hereinbefore referred to is known from Danish Pat. No. 61292.
  • the projections are approximately hemispherical, and in the spaces between them there are provided hemispherical hollows.
  • the foil material is inserted in the roll nip between the two rolls it is caused to pass between a considerable number of roll couples having peripheral ridges and grooves whereby the material becomes grooved and its width is reduced.
  • the material is clamped between the peak of a projection and the bottom of a corresponding hollow and bulges are formed on both sides of the foil material. In this process no stretching of the original material takes place. Thereby there is obtained a material which may be expanded in all directions.
  • the object of the invention is to provide a method of the type hereinbefore referred to by means of which a cheaper and simpler machine may be employed.
  • the characterizing features of the method according to the invention are that the embossing is carried out by stretching the foil material from each projection peak on each roll to the surrounding projection peaks on the other roll.
  • This method may be carried out by means of only one roll couple and, accordingly, by means of a very cheap and simple machine.
  • the method may be carried out entirely without any special preliminary treatment such as moistening of paper material.
  • By means of the stretching there may, furthermore, be obtained such a distribution of material that the material has become thinner in the vicinity of the peaks while it completely or essentially has retained its thickness at the middle of the stretch between the peaks at both sides so that a relatively large strength and impact absorption capacity is obtained.
  • the method is carried out with paper or some other fibrebased material, there may be obtained a soft, textile-like texture.
  • the embossing may be carried out in such a manner that the foil material abutting each projection peak is not touched by the other roll.
  • the material abutting the projection peaks may move and be stretched.
  • the stretched peaks projecting to both sides will have a good moisture absorption capacity so that the material will be well-suited as napkins or for similar purposes.
  • the invention furthermore relates to a roll couple for carrying out the method, and the characterizing features of the roll couple according to the invention are that the projections have an essentially flat top surface and a well defined, though rounded transition region to the projections lateral surface.
  • the projections have an essentially flat top surface and a well defined, though rounded transition region to the projections lateral surface.
  • the top surface does not have to be completely plane, or rather a part of a cylinder surface, namely a portion of the rolls surface before it is machined so as to provide the projections: said top surface may to the contrary advantageously be slightly vaulted upward although having a larger radius of curvature than the transition area to the lateral surface of the projection.
  • the angle between the top surface and at least the upper portion of the lateral surface of the projections may be larger than During the embossing operation there is hereby obtained a support of the material in the oblique direction from one peak on one side to another peak at the other side so that intensive embossing may be carried out without tearing the material apart.
  • the lateral surface of the projections may, at least on their upper portions, be shaped approximately like an involute.
  • the projections will cooperate in a manner similar to involute cogs of a cog wheel.
  • There is obtained a gentle treatment of the material so that an intensive embossing may be carried out without ripping the material apart.
  • the two rolls may be arranged in such a manner relative to each other that there is obtained a rollingofi' under pressure downwards from each projection peak whereby there is obtained a gentle treatment of the opposite side of the material projection when the roll projections engage each other at this point.
  • the lateral surface may, according to the invention, be shaped, at least at its upper part, as the lateral surface of a cog with an angle of engagement of 20. It has turned out that it is particularly advantageous to employ rolls with such projections.
  • At least one of said directions may, according to the invention, be oblique.
  • both directions should be oblique and preferably have the same angle of inclination.
  • the angle between each of the two directions and the axial direction may be less than 45. It has turned out that thereby there is obtained a more gentle treatment than with an angle of 45. According to the invention said angle may be in the range of 38 to 41, preferably 38.5.
  • the extent of the peak of the projection may be smaller than the height of the projection.
  • the extent of the peak in relation to the height of the projection may advantageously be the same as in ordinary cog wheels.
  • the rolls may, according to the invention, have the same diameter. Hereby is obtained an advantageously regular engagement from both sides.
  • FIG. 1 shows a machine for carrying out the method according to the invention, seen schematically along a longitudinal section
  • FIG. 2 a vertical cross section of same
  • FIG. 3 the segment of the roll indicated in FIG. 1, shown in larger scale and folded out
  • FIG. 4 a schematic illustration of the engagement between the two rolls in FIG. 1,
  • FIG. a section through the roll nip of the two rolls.
  • the machine shown in FIG. 1 and 2 has two rolls 1 and 2 which are identical and in their longitudinal direction are subdivided into 5 sections which are untumably retained on two shafts 3 and 4.
  • the latter at one end have a cog wheel 5 and 6, the cog wheel 6 being subdivided into two portions which may be rotatably set in relation to each other so as to eliminate any play.
  • the shaft 3 is joumalled in a frame 7 and is connected to a gear motor 11 by means of a sprocket wheel 8, a chain 9 and a sprocket wheel 10.
  • the shaft 4 is joumalled in slides 12 and 13 which are displaceable up and down on columns of the frame.
  • Each of the slides 12 and 13 have an upwardly projecting spindle 14 which engages a nut 15, and said nuts have extemal worm gear teeth which engage a spindle 16 which is joumalled in the frame and carries a manually operatable wheel 17 by means of which the spindle 16 may be turned so as to turn the nuts which are arranged undisplaceably and therefore move the spindles 14 and, accordingly, the slides 12 and 13 up and down when they are turned.
  • the roll 2 may be adjusted in relation to the fixedly joumalled roll 1.
  • FIG. 1 there is indicated a surface portion of the roll 2. This portion is shown in FIG. 2. in larger scale and folded out, it being noted that preferably the entire surface is designed in this manner, and that goes for the roll 1 also.
  • the rolls are manufactured from cylindrical work pieces by machining grooves at angles of 38.5" and having a shape corresponding to the shape of helical cog wheels.
  • approximately pyramidical projections are formed, the sides of which preferably are shaped like involute teeth with an angle of engagement of 20.
  • the transition between the approximately plane top surface and the lateral surfaces is rounded as indicated in FIG. 5. Furthermore, the edges between the four lateral surfaces may be rounded.
  • each projection on one roll, in the roll nip between the rolls, is placed between four projections of the other roll with its corners close to the corresponding comer of each of the four projections.
  • the rolls are caused to rotate, and plane strip material is inserted in the roll nip between the rolls. Thereby there is obtained an engagement as indicated in FIG. 5.
  • all the teeth are identical, but the height and shape of the teeth may just as well vary, for instance so as to obtain a particular patterned efiect. For instance it will be possible to make some of the projections with a relatively largesurface, which may be of importance when the embossed product is to be glued to a flat sheet.
  • the material may consist of paper, fibrous material, metal or thermoplastic material.
  • the two sets of grooves are arranged with the same angle of inclination, but they may just as well have different angles of inclination. Possibly, one of the sets of grooves may extend in the axial direction while the other set extends in an oblique direction.
  • the projections on one roll together with alternating corresponding projections on the other roll forming straight lines substantially parallel to the axes of the rolls, the projections on each roll being defined by a peak surface from which extend lateral oblique surfaces, at least the upper portions of which are of substantially involute shape, securing the foil material at said involute oblique surfaces of mating projections while leaving free for stretching the material at the peak surfaces of each projection, and stretching, as an incidence of the embossing operation, said material substantially only at said peak surfaces of said projections while securing said material against movement at said involuted surfaces.
  • Apparatus for embossing a foil material comprising a pair of rolls defining a nip within which said material is adapted to be fed, each roll being provided with a plurality of projections, a projection on each roll, during operation of said rolls, being surrounded on all sides by projections on the other roll, and each projection on a roll being axially offset relative to the peripherally adjacent projections on the same roll, the projections on one roll together with alternating corresponding projections on the other roll forming straight lines substantially parallel to the axes of the rolls, each projection on each roll being defined by a peak surface from which extend lateral oblique surfaces at an angle with respect thereto greater than at least the upper portion of said oblique surfaces of each projection on each roll being involuted for engagement of complementary mating involuted surfaces of said projections on said rolls, the peak surface of each projection on each roll being of smaller extent than the lateral oblique surfaces.
  • each projection is essentially flat, there being a well defined and rounded transition from said peak surface to said lateral oblique surfaces of each projection.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
  • Treatment Of Fiber Materials (AREA)
US62850A 1969-08-13 1970-08-11 Method of manufacturing a foil material embossed on both sides,a roll nip and a machine for carrying out the method Expired - Lifetime US3673839A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK434469AA DK131333B (da) 1969-08-13 1969-08-13 Tosidigt præget folie, valsepar til fremstilling af dette folie og en fremgangsmåde til fremstilling af dette folie.

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Publication Number Publication Date
US3673839A true US3673839A (en) 1972-07-04

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US62850A Expired - Lifetime US3673839A (en) 1969-08-13 1970-08-11 Method of manufacturing a foil material embossed on both sides,a roll nip and a machine for carrying out the method

Country Status (11)

Country Link
US (1) US3673839A (de)
AT (1) AT320422B (de)
BE (1) BE754620A (de)
CA (1) CA919967A (de)
CH (1) CH509886A (de)
DE (1) DE2040042A1 (de)
DK (1) DK131333B (de)
FR (1) FR2058248B1 (de)
GB (1) GB1312359A (de)
NL (1) NL7011674A (de)
SE (1) SE365460B (de)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4153664A (en) * 1976-07-30 1979-05-08 Sabee Reinhardt N Process for pattern drawing of webs
US4248822A (en) * 1978-02-15 1981-02-03 Lever Brothers Company Process and apparatus for producing a moisture-permeable film
US5007271A (en) * 1983-10-21 1991-04-16 Karl Boegli Device and a method for embossing a metal foil
EP1181152A1 (de) 1999-05-17 2002-02-27 Boegli-Gravures S.A. Vorrichtung zum prägen oder satinieren von flachmaterial
US20040011107A1 (en) * 2000-10-13 2004-01-22 Charles Boegli Device for embossing and/or satin-finishing a flat material
AU772613B2 (en) * 1999-05-06 2004-05-06 Boegli-Gravures S.A. Device for embossing a foil, application of the device, method for its manufacture, and method for the operation of the device
US20050132905A1 (en) * 2003-12-23 2005-06-23 Papadopoulos Jeremy J.M. Interchangeable embossing plates for mounting on an embossing roll
US20080116610A1 (en) * 2006-11-22 2008-05-22 Boegli-Gravures S.A. Device for satinizing and embossing packaging foils
CN102485492A (zh) * 2010-12-06 2012-06-06 上海华虹计通智能系统股份有限公司 凹凸字符自动压印机构
CN102756597A (zh) * 2012-07-06 2012-10-31 芜湖美亚特新型建材有限公司 具有间隙调节机构的板材压纹机
US11298911B2 (en) 2017-06-14 2022-04-12 Boegli-Gravures Sa Method and embossing structure using high density pressure for creating shadowed or curved highly reflective areas on rotationally embossed foils
US11453190B2 (en) 2016-12-20 2022-09-27 Boegli-Gravures Sa Method and embossing structure for maximizing pressure buildup at rotational embossing of foils
US11819894B2 (en) 2018-06-26 2023-11-21 Boegli-Gravures Sa Method and device for embossing relief structures
WO2026047570A1 (en) * 2024-08-28 2026-03-05 Boegli-Gravures Sa Method and system for producing an increased surface area of a metallic foil by embossing

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5158523A (en) * 1990-09-17 1992-10-27 James River Corporation Of Virginia Apparatus for enhanced emboss bonding of multi-ply tissue products
DE59800229D1 (de) 1997-12-19 2000-09-14 Boegli Gravures Sa Vorrichtung zum Satinieren einer Folie, Anwendung dieser Vorrichtung und Verfahren zum Betrieb der Vorrichtung
CN102756411A (zh) * 2012-07-06 2012-10-31 芜湖美亚特新型建材有限公司 板材压纹机
CN103802191B (zh) * 2014-02-19 2015-09-23 江阴市赛英电子有限公司 使用夹紧头限位传感器并能喷涂涂层材料的板材加工方法
CN103786221B (zh) * 2014-02-19 2015-09-30 江阴市中强科技有限公司 使用夹紧头限位传感器和左右移动丝杠的板材加工方法
CN103802190B (zh) * 2014-02-19 2015-09-16 海安江理工技术转移中心有限公司 使用真空吸盘和左、右限位传感器的板材加工方法
CN103786217B (zh) * 2014-02-19 2015-10-07 江阴市中强科技有限公司 能压制纹路并能喷涂涂层材料的板材加工方法

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4153664A (en) * 1976-07-30 1979-05-08 Sabee Reinhardt N Process for pattern drawing of webs
US4248822A (en) * 1978-02-15 1981-02-03 Lever Brothers Company Process and apparatus for producing a moisture-permeable film
US5007271A (en) * 1983-10-21 1991-04-16 Karl Boegli Device and a method for embossing a metal foil
AU772613B2 (en) * 1999-05-06 2004-05-06 Boegli-Gravures S.A. Device for embossing a foil, application of the device, method for its manufacture, and method for the operation of the device
EP1181152A1 (de) 1999-05-17 2002-02-27 Boegli-Gravures S.A. Vorrichtung zum prägen oder satinieren von flachmaterial
RU2375191C2 (ru) * 2000-10-13 2009-12-10 Боэгли-Гравюр С.А. Устройство для тиснения упаковочной фольги и металлизированная и/или отражающая упаковочная фольга
US20040011107A1 (en) * 2000-10-13 2004-01-22 Charles Boegli Device for embossing and/or satin-finishing a flat material
US7036347B2 (en) * 2000-10-13 2006-05-02 Boegli-Gravures Sa Device for embossing and/or satin-finishing a flat material
US20050132905A1 (en) * 2003-12-23 2005-06-23 Papadopoulos Jeremy J.M. Interchangeable embossing plates for mounting on an embossing roll
US20060054035A1 (en) * 2003-12-23 2006-03-16 Papadopoulos Jeremy J M Interchangeable embossing plates for mounting on an embossing roll
US7028612B2 (en) 2003-12-23 2006-04-18 Paper Converting Machine Company Interchangeable embossing plates for mounting on an embossing roll
US20080116610A1 (en) * 2006-11-22 2008-05-22 Boegli-Gravures S.A. Device for satinizing and embossing packaging foils
US8430663B2 (en) * 2006-11-22 2013-04-30 Boegli-Gravures S.A. Device for satinizing and embossing packaging foils
CN102485492A (zh) * 2010-12-06 2012-06-06 上海华虹计通智能系统股份有限公司 凹凸字符自动压印机构
CN102756597A (zh) * 2012-07-06 2012-10-31 芜湖美亚特新型建材有限公司 具有间隙调节机构的板材压纹机
US11453190B2 (en) 2016-12-20 2022-09-27 Boegli-Gravures Sa Method and embossing structure for maximizing pressure buildup at rotational embossing of foils
US11298911B2 (en) 2017-06-14 2022-04-12 Boegli-Gravures Sa Method and embossing structure using high density pressure for creating shadowed or curved highly reflective areas on rotationally embossed foils
US11819894B2 (en) 2018-06-26 2023-11-21 Boegli-Gravures Sa Method and device for embossing relief structures
US12194517B2 (en) 2018-06-26 2025-01-14 Boegli-Gravures Sa Method and device for embossing relief structures
WO2026047570A1 (en) * 2024-08-28 2026-03-05 Boegli-Gravures Sa Method and system for producing an increased surface area of a metallic foil by embossing
WO2026047373A1 (en) * 2024-08-28 2026-03-05 Boegli-Gravures Sa Method and system for producing an increased surface of a metallic foil by embossing

Also Published As

Publication number Publication date
DK131333C (de) 1975-11-24
FR2058248A1 (de) 1971-05-28
FR2058248B1 (de) 1973-01-12
DE2040042A1 (de) 1971-03-11
CA919967A (en) 1973-01-30
GB1312359A (en) 1973-04-04
SE365460B (de) 1974-03-25
CH509886A (de) 1971-07-15
NL7011674A (de) 1971-02-16
AT320422B (de) 1975-02-10
BE754620A (fr) 1971-01-18
DK131333B (da) 1975-06-30

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