US3627412A - Apparatus for decorating pressed tins - Google Patents

Apparatus for decorating pressed tins Download PDF

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Publication number
US3627412A
US3627412A US839384A US3627412DA US3627412A US 3627412 A US3627412 A US 3627412A US 839384 A US839384 A US 839384A US 3627412D A US3627412D A US 3627412DA US 3627412 A US3627412 A US 3627412A
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United States
Prior art keywords
tin
section
truncated cone
pressed
cross
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Expired - Lifetime
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US839384A
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English (en)
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Lucien Jean
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Cebal GP
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Cebal GP
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F17/00—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
    • B41F17/08—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on filamentary or elongated articles, or on articles with cylindrical surfaces
    • B41F17/14—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on filamentary or elongated articles, or on articles with cylindrical surfaces on articles of finite length
    • B41F17/18—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on filamentary or elongated articles, or on articles with cylindrical surfaces on articles of finite length on curved surfaces of articles of varying cross-section, e.g. bottles, lamp glasses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/08—Anamorphotic objectives

Definitions

  • the external wall of which is in the form of a truncated cone, the two bases of which are similar to the section of the internal cylinder and a correcting lens the contour of the correcting lens is geometrically similar to the cross section of the finished tin and provides distortions which are determined graphically from an experimental tin.
  • the present invention has as its object an apparatus for decorating pressed tins.
  • the invention applies to any pressed tins the cross section of which is a closed curve inside which there is at least one point such that any polar half-ray from this point meets the curve at only one point. It applies more particularly to cylindrical tins, the word cylindrical being taken in its most general geometrical sense.
  • Pressed tins such as tins for preserved food or for drink but also tins containing paint or more generally products intended for sale to the general public are generally decorated by printing either on a sheet of paper or plastics material which is wrapped round the sidewall of the cylinder or on the tin which has already been pressed.
  • the first process is expensive and not very elegant; the decorative sheet often tears 'either partly or completely, which looks untidy and makes a bad impression.
  • the second process is long and expensive and the possible motifs which can be used for printing in this way are limited.
  • the anamorphosis is obtained by means of an apparatus comprising, first, an anamorphic device including a luminous and translucent cylinder the cross section of which is geometrically similar to that of the finished pressed tin and which carries a transparent reproduction of the subject to be printed, and a truncated cone-shaped reflector which is mounted coaxially with the aforesaid cylinder and, second, a photographic apparatus for obtaining the distorted image.
  • This device has the disadvantage of requiring a transparent reproduction of the subject to be printed and it is difficult to produce with precision and preserve over any length of time since it requires a mirror which is perfect as regards its surface definition and the purityof the reflective metal deposit. If any deformation occurs, no repair is possible.
  • this device gives rises to a distorted image, on the one hand owing to the nonlinearity of the elongation of the metal which occurs in pressing, the layers of metal situated at different levels on the sidewall of the resulting tin not undergoing the same amount of deformation, and on the other hand because owing to the anisotropic character of the metal, the tin after pressing has at least four cusps situated in predetermined directions in relation to the direction of rolling of the sheet from which the blank has been cut out, these cusps in practice being frequently four in number situated in directions which form an angle of 50 with the direction of rolling of the sheet. These cusps obviously are cut during the final phase of production of the tin but the decoration on the side of the tin undergoes a corresponding distortion which remains.
  • the object of the invention is an apparatus for decorating pressed tins by printing on a blank which is to be pressed a distorted image which produces after pressing the subject which is to be printed on the tin, which will be inexpensive, durable and easy to touch up if spoiled and which avoids the distortion which is produced in the decoration of the sidewall of the tin as a result both of the nonlinearity of the distortion of the metal and of the anisotropic character of the metal.
  • FIG. 1 is a schematic view, partially in section, of an arrangement of elements making up the apparatus of this invention
  • FIG. 2 is a developmental view of the sidewalls of a tin to be decorated, which has been photographed to constitute the original;
  • FIG. 3 shown the distorted image provided by the apparatus, as reproduced on the blank to be pressed
  • FIG. 4 shows the tin obtained upon pressing
  • FIG. 5 is a view showing the baseline of a rectangular sardine tin with some of the generatrices indicated by reference numerals;
  • FIG. 6 is a graph for determining the correcting lens
  • FIG. 7 is a geometric drawing illustrating the calculation for the correcting lens
  • FIG. 8 and 9 are sectional views of the correcting lens along two generatrices referred to by numerals in FIG. 5;
  • FIG. 10 is a view of the appearance of curves at the level of the correcting lens of the tin shown in FIG. 5.
  • the apparatus comprises an anamorphic device and a photographic apparatus. It is characterized in that the anamorphic'device comprises, in combination, first, a truncated cone of very transparent optical material which is perforated along an internal wall in the form of a cylinder, the cross section of which is geometrically similar to the cross section of the tin which is to be formed, and the external wall of which is in the form of a truncated cone the two bases of which are similar to the section of the internal cylinder, and, second, a correcting lens the contour of which is geometrically similar to the cross section of the finished tin and which provides distortions which are determined. graphically from an experimental tin.
  • the apparatus shown in FIG. 1 comprises an anamorphic device comprising a truncated cone 2 and a correcting lens 4, both made of very transparent optical material, and a photographic apparatus 3.
  • the truncated cone 2 is formed with a central passage defined by an internal wall 22 to form a cylinder the cross section of which is geometrically similar to the cross section of the can to be produced.
  • This cross section is represented as being circular but it may be in the form of any closed curve which has a point preferably situated in its central region, which point will hereinafter be referred to as center", such that any polar half-ray from this point meets the curve at only one point, such as a square, a rectangle, a triangle, an ellipse or any combination of these figures.
  • the external wall 21 of the block 2 is in the form of a truncated cone the two bases of which are similar to the section of the internal cylinder.
  • the two walls 21 and 22 lie on the same axis 300.
  • the correcting lens 4 has a zone 41 in the region of its axis 300 which consists of a strip with parallel surfaces corresponding to the base of the tin, and around this central zone is a peripheral zone 42 the determination of which is described hereinafter.
  • the original 100 that is to say the sidewall of the tin to be formed, which is reproduced photographically, is applied against the internal wall 22 of the truncated cone 2 and then photographed through the correcting lens 4 by the photographic apparatus 3.
  • a negative is obtained which can now be used, if necessary, together with an undistorted negative 120, to represent the decoration of the base of the tin by any known process such as photogravure, offset printing, zerography or any other.
  • the position of the original in the truncated cone, the enlargement of the photographic apparatus and the distance of the correcting lens are obviously so arranged that a negative 110 of the required dimensions is obtained.
  • FIG. 1 shows a circular blank for a tin of circular cross section.
  • FIG. 2 represents the original 100, that is to say the sidewall of the tin to be formed, reproduced photographically.
  • the surface has been checkered so that one can more easily understand how this figure will be distorted.
  • FIG. 3 is obtained: the horizontal lines 101, 102 and 103 are transformed into concentric curves 111, 112, 113 and the vertical lines 104, 105, 106 become straight lines passing through the center 301, namely 114, and 116.
  • a straight line such as 114 passing through the center 301 cuts the curves 111 and 112 at points the distance of which is obtained by multiplying the height of the tin by the inverse ratio of the elongation produced by pressing.
  • the concentric circles 1 11 to 113 are not equidistant, which is due to the correction of the nonlinearity of the distortion of the metal, and that they are distorted, which is due to the correction of the efiect of the cusps.
  • FIG. 3 The drawing shown in FIG. 3 is then applied to the blank which is then pressed (FIG. 4).
  • the drawing on the sidewall takes on the form shown in FIG. 2, which is assumed to be wrapped round the cylindrical wall of the tin.
  • the material used for the truncated cone 2 preferably has a high-refractive index.
  • a polymer based on methyl methacrylate which has a transmission power of 92 percent in the visible spectrum and a refractive index of L493 for the D line of sodium at 20 C.
  • the truncated cone 2 may be lit up either from the outside or by a source of light placed inside its cylindrical cavity.
  • the distribution of light energy between the reflected rays and the emergent refracted rays depends on the polarization of the light but there is always one ray which is reflected by the truncated cone surface 21 and emerges from the base of the block.
  • the exposure times are very short, in fact less than 30 seconds, there is no difficulty in taking into account a reduction in the light energy of the emergent reflected ray when the incident angle of the rays decreases since all that is necessary is to increase the exposure time accordingly.
  • the total transmission factor can also be considerably improved by improving the transmission of light at the entrance of the image in the truncated cone by immersion, that is to say interposing a liquid between the original 100 and the internal surface 22 of the truncated cone so as to ensure total contact.
  • the reflected light'ray may be considered to constitute a parallel beam of light, and under these conditions there is no alteration of the image.
  • An object lens of long focal distance is used with a small aperture.
  • the use of the truncated cone 2 has the following advantages: the possibility of using either a transparent or an opaque original 100 glued to the' cylindrical wall 22. Only the exposure time, which results from integration of the quantity of reflected light, is different and translates the change of origin of the light and the difference of the path of the light rays into the truncated cone; however, if a transparent original is used the source of light must be situated inside the original whereas if an opaque original is used the source must be placed outside; in either case, a diffuser must be used to prevent the shadows which a direct light could produce; in the case of a transparent original, it can be useful to cover the outside surface 21 of the truncated cone 2 with a thin metallic layer.
  • the correcting lens is set up as explained below.
  • An experimental tin is first produced by pressing from a blank contour of which is homothetic with the stated curve: baseline which defines the base of the tin and which is checkered in millimeters, on the generatrices perpendicular to this baseling.
  • baseline which defines the base of the tin and which is checkered in millimeters
  • FIG. shows the generatrices 117 and 118 in the case of a rectangular tin such as a sardine tin, and in FIG. 6 the lower right-hand curve is the theoretical curve of zero elongation and the upper curve represents the observed elongation, the difference between the ordinates of these two curves being indicated by H which in fact indicates the correction to be made.
  • the correcting lens 4 is removed and a prism of small angle A and refractive index n is placed on the optical ray which joins a given point of the image provided by the truncated cone 2 to the object lens and at a distance L from this image, this ray will be deviated by an angle.
  • the correcting lens constitutes a continuous collection of such prisms, the angle A representing the local inclination of the surface of the lens.
  • FIG. 8 shows the appearance of the section of the correcting lens along the generatrix 117
  • FIG. 9 shows the same section for the generatrix 118.
  • the differences in thickness in relation to a strip with parallel surfaces are 0.4 mm. for a height of 20 mm. for the generatrix I17 and 1 mm. for the same height for the generatrix I18 situated at a cusp.
  • FIG. 10 shows the curves at the level of the correcting lens for the same tin.
  • the correcting lens described may be made in the form of two elements which may or may not be joined together, one of which provides the anisotropic correction and the other the correction for the nonlinearity of the elongation.
  • An apparatus for decorating pressed tine by printing a distorted image on a blank which is to be pressed but avoids the distortion of the decoration on the sidewall of the tin which may result from nonlinearity of the distortion of the metal and from the anisotropic character of the metal comprising an anamorphic device and a photographic apparatus in which the anamorphic device comprises in combination a truncated cone of transparent optical material having a perforation along an internal wall in the form of a cylinder, the cross section of which is geometrically similar to the cross section of the tin which is to be formed, and an external wall which is in the form of a truncated cone, the two bases of which are similar to the section of the internal cylinder and a correcting lens, the contour of which is geometrically similar to the cross section of the tin to be formed and which provides distortions which correspond to the distortions of the tin to be formed.
  • An apparatus for decorating pressed tins by printing a distorted image on a blank which is to be pressed but avoids the distortion of the decoration on the sidewall of the tin which mayresult from.nonlinearity of the distortion of the metal and from the anisotropic character of the metal comprising an anamorphic device and a photographic apparatus in which the anamorphic device comprises in combination a truncated cone of transparent optical material having a perforation along an internal wall in the form of a cylinder, the cross section of which is geometrically similar to the cross section of the tin which is to be formed, and an external wall which is in the form of a truncated cone, the two bases of which are similar to the section of the internal cylinder and a correcting lens having a central zone formed of a strip with parallel surfaces geometrically similar to the shape of the tin to be formed and a peripheral zone obtained by pressing an experimental tin from a blank on which a checkered design is drawn, said tin enabling the curve
  • L is the distance of the given point on the correcting lens from the corresponding point of the image given by the truncated cone.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Printing Methods (AREA)
  • Preparing Plates And Mask In Photomechanical Process (AREA)
  • Image Processing (AREA)
  • Lenses (AREA)
US839384A 1968-07-12 1969-07-07 Apparatus for decorating pressed tins Expired - Lifetime US3627412A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR158928 1968-07-12

Publications (1)

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US3627412A true US3627412A (en) 1971-12-14

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US839384A Expired - Lifetime US3627412A (en) 1968-07-12 1969-07-07 Apparatus for decorating pressed tins

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US (1) US3627412A (enrdf_load_stackoverflow)
JP (1) JPS4823455B1 (enrdf_load_stackoverflow)
AT (1) AT294538B (enrdf_load_stackoverflow)
BE (1) BE736002A (enrdf_load_stackoverflow)
CH (1) CH500784A (enrdf_load_stackoverflow)
DE (1) DE1935422A1 (enrdf_load_stackoverflow)
DK (1) DK124500B (enrdf_load_stackoverflow)
ES (1) ES369420A1 (enrdf_load_stackoverflow)
FI (1) FI49087C (enrdf_load_stackoverflow)
FR (1) FR1590126A (enrdf_load_stackoverflow)
GB (1) GB1280345A (enrdf_load_stackoverflow)
IL (1) IL32602A (enrdf_load_stackoverflow)
LU (1) LU59083A1 (enrdf_load_stackoverflow)
NL (1) NL164135C (enrdf_load_stackoverflow)
NO (1) NO123011B (enrdf_load_stackoverflow)
OA (1) OA03096A (enrdf_load_stackoverflow)
SE (1) SE350619B (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981002346A1 (en) * 1980-02-18 1981-08-20 H Kurpershoek Flexographic printing camera and method of operation
FR2535858A1 (fr) * 1982-11-10 1984-05-11 Cebal Perfectionnement aux dispositifs optiques d'impression de flans destines a l'emboutissage
US4935774A (en) * 1988-04-23 1990-06-19 Ricoh Company, Ltd. Method and an apparatus for performing three-dimensional exposure
US4956906A (en) * 1988-12-01 1990-09-18 Cebal Method of preparing pre-distorted images for decorating a shaped blank
EP0215718B1 (fr) * 1985-09-09 1991-03-20 Giuseppe Paccagnella Appareil mécanique pour relever les déformations de l'image qui se produisent dans l'impression en couleurs de boîtes métalliques embouties et pour tracer les courbes de correction correspondantes
US20050044760A1 (en) * 2003-09-03 2005-03-03 Orb Packaging Uk Limited Displaying graphics on a container

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2453432A1 (fr) * 1979-04-05 1980-10-31 Ferembal Sa Dispositif pour la production d'une image intermediaire deformee servant a la fabrication d'une plaque d'impression d'un flan avant emboutissage
FR2554610B1 (fr) * 1983-11-08 1986-04-11 Carnaud Emballage Sa Procede d'anamorphose d'illustration d'emballage cylindrique embouti pour l'impression sur le flan avant emboutissage, et appareil mettant en oeuvre ce procede
EP0202928B1 (en) 1985-05-22 1993-01-07 Toyo Seikan Kaisha Limited Process for printed draw-formed body, and container formed by this process
US5282306A (en) * 1988-06-15 1994-02-01 Toyo Seikan Kaisha, Ltd. Process for the preparation of a draw-formed printed can
CN102145604B (zh) * 2010-02-09 2015-04-08 上海宝钢包装股份有限公司 浅冲两片罐uv变形印涂方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3073210A (en) * 1959-01-19 1963-01-15 Joseph W Packard Prismatic reflecting device
US3238909A (en) * 1964-06-15 1966-03-08 Reynolds Metals Co Distortion correction system
US3314329A (en) * 1964-10-06 1967-04-18 American Can Co Method of optical correction for preprinting drawn articles

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3073210A (en) * 1959-01-19 1963-01-15 Joseph W Packard Prismatic reflecting device
US3238909A (en) * 1964-06-15 1966-03-08 Reynolds Metals Co Distortion correction system
US3314329A (en) * 1964-10-06 1967-04-18 American Can Co Method of optical correction for preprinting drawn articles

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981002346A1 (en) * 1980-02-18 1981-08-20 H Kurpershoek Flexographic printing camera and method of operation
FR2535858A1 (fr) * 1982-11-10 1984-05-11 Cebal Perfectionnement aux dispositifs optiques d'impression de flans destines a l'emboutissage
WO1984002008A1 (fr) * 1982-11-10 1984-05-24 Cebal Perfectionnement aux dispositifs optiques d'impression de flans destines a l'emboutissage
JPS59501997A (ja) * 1982-11-10 1984-11-29 セバル 絞り成形用ブランクの光学的プリント装置の改良
US4556312A (en) * 1982-11-10 1985-12-03 Cebal Optical printing devices for printing on blanks which are intended for swaging
JPS6417510U (enrdf_load_stackoverflow) * 1982-11-10 1989-01-27
EP0215718B1 (fr) * 1985-09-09 1991-03-20 Giuseppe Paccagnella Appareil mécanique pour relever les déformations de l'image qui se produisent dans l'impression en couleurs de boîtes métalliques embouties et pour tracer les courbes de correction correspondantes
US4935774A (en) * 1988-04-23 1990-06-19 Ricoh Company, Ltd. Method and an apparatus for performing three-dimensional exposure
US4956906A (en) * 1988-12-01 1990-09-18 Cebal Method of preparing pre-distorted images for decorating a shaped blank
US5143793A (en) * 1988-12-01 1992-09-01 Cebal Decorated hollow element
US20050044760A1 (en) * 2003-09-03 2005-03-03 Orb Packaging Uk Limited Displaying graphics on a container

Also Published As

Publication number Publication date
IL32602A0 (en) 1969-09-25
IL32602A (en) 1972-12-29
DK124500B (da) 1972-10-23
DE1935422A1 (de) 1970-10-01
ES369420A1 (es) 1971-05-16
FI49087B (enrdf_load_stackoverflow) 1974-12-02
BE736002A (enrdf_load_stackoverflow) 1970-01-12
NL164135C (nl) 1980-11-17
CH500784A (fr) 1970-12-31
NL164135B (nl) 1980-06-16
SE350619B (enrdf_load_stackoverflow) 1972-10-30
AT294538B (de) 1971-11-25
FR1590126A (enrdf_load_stackoverflow) 1970-04-13
LU59083A1 (enrdf_load_stackoverflow) 1970-01-15
GB1280345A (en) 1972-07-05
FI49087C (fi) 1975-03-10
OA03096A (fr) 1970-12-15
JPS4823455B1 (enrdf_load_stackoverflow) 1973-07-13
NO123011B (enrdf_load_stackoverflow) 1971-09-13
NL6910678A (enrdf_load_stackoverflow) 1970-01-14

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