EP0077772A1 - Procede et appareil de formation d'un element de fermeture solidaire pour un conteneur thermoplastique - Google Patents

Procede et appareil de formation d'un element de fermeture solidaire pour un conteneur thermoplastique

Info

Publication number
EP0077772A1
EP0077772A1 EP81901627A EP81901627A EP0077772A1 EP 0077772 A1 EP0077772 A1 EP 0077772A1 EP 81901627 A EP81901627 A EP 81901627A EP 81901627 A EP81901627 A EP 81901627A EP 0077772 A1 EP0077772 A1 EP 0077772A1
Authority
EP
European Patent Office
Prior art keywords
die
film
fastening element
base
forming
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.)
Withdrawn
Application number
EP81901627A
Other languages
German (de)
English (en)
Inventor
Thomas Albert Sutrina
Raymond Douglas Behr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dow Chemical Co
Original Assignee
Dow Chemical Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dow Chemical Co filed Critical Dow Chemical Co
Publication of EP0077772A1 publication Critical patent/EP0077772A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D5/00—Producing elements of slide fasteners; Combined making and attaching of elements of slide fasteners
    • B29D5/10—Producing elements of slide fasteners; Combined making and attaching of elements of slide fasteners the interlocking members being formed by continuous profiled strip
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/345—Extrusion nozzles comprising two or more adjacently arranged ports, for simultaneously extruding multiple strands, e.g. for pelletising
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting

Definitions

  • This invention relates to a high speed cast process and apparatus for making an improved film or sheet product with integral fastening elements.
  • this invention relates to a method and apparatus of in-line forming of integral fastening elements with film or sheet stock to be made into bags or other containers which are closable by the fastening elements.
  • bags with integral fastening elements have been made by the blown film process similar to that taught in U.S. Patent No. 3,340,116, for example.
  • the fastening elements are extruded from the same polymer melt streams through an annular die containing extrusion orifices.
  • Another technique for manufacturing integral fastening elements is taught, for example, in U.S. Patent No. 3,462,332. That patent discloses a cast film process wherein the fastening elements are extruded separately from the film and are thereafter joined with the film by being brought together against a rotating cooling roll while
  • the film and fastening elements are still in a fusible state.
  • the invention leads to flexibility and hardware and product improvements heretofore unknown to the art.
  • the present invention permits forming of a thickened base for the fastening elements in order to permit more erect elements which do not bend or rotate out of alignment when it is desired to interlock or disengage the same.
  • extra base strips are extruded together with the fastening elements and are joined to a separately extruded film or sheet close to their die exits.
  • the base strips and fastening elements are joined to a separately extruded film or sheet within the sheeting or film die and before the base strips, fastening elements and film or sheet exit from the die slot.
  • the fastening elements with their integral bases are joined to the film or sheet stock externally of or within the sheeting die to 5 permit ready fusing of the thickened bases to the film or sheet stock which is, in turn, formed into bags or containers.
  • the location and width of the base strips on the fastening elements can be changed without affecting the film or sheet extrusion.
  • the thickness of the base strips extruded with the fastening elements are independent of the film or sheet stock thickness.
  • the present invention also permits the production of two or more bags or containers of varying size from the same film extrusion since the
  • 15 thickened base strips can be a base for a plurality of fastening elements varyingly spaced apart.
  • the sheet or film die lips can remain wide and therefore less susceptible to damage and still not interfere with adhesion between the fastening elements and the film or
  • the invention resides in a method for forming an integral thermoplastic fastening element on a thermo ⁇ plastic film or sheet extruded from a film die comprising the steps of extruding at least one fastening element
  • the invention further resides in an apparatus for forming an integral thermoplastic fastening element on a thermoplastic film or sheet, including a forming die for extruding the film through a forming slot in said die, a die plate positioned adjacent to the forming for extruding said fastening element at a predetermined angle with respect to the extruded film for joining said fastening element to the film, a chill roll for cooling the combined film and fastening element, said chill roll being positioned with respect to the forming die to provide a predetermined distance (h) between a horizontal line extending tangentially of an outer circumferential surface of the chill roll and a die lip on the forming die and a predetermined distance (d). between a vertical line extending from the die lip to said outer circumferential and tangential surface of the chill roll.
  • a forming die for extruding the film through a forming slot in said die
  • a die plate positioned adjacent to the forming for extruding said fastening element at a pre
  • the invention further resides in an apparatus for forming an integral thermoplastic fastening element on a thermoplastic film or sheet, said apparatus com ⁇ prising an extrusion die having a film forming slot ending, in an extrusion die lip, said die having an angularly disposed surface extending toward said film forming slot and die lip, a die plate positioned adjacent to said die slot and forming an extrusion channel for the fastening element which is arranged in an angular relationship with respect to the film forming slot to increase the acuteness of the angle of the extrudate issuing from the die plate channel with respect to the extrudate issuing from said film forming slot, and cooling means located below said extrusion die and die plate.
  • the invention further resides in a cast, relatively unoriented film or sheet having integral relatively stiff male and female fastening members, each of said fastening members having a base strip secured to said film or sheet over at least 90 percent of the width of each base whereby said base provides sufficient rigidity for the fastening members during each opening and closing of the fastening members for said relatively unoriented cast film.
  • Figure 1 is a schematic elevational view showing an extrusion apparatus for integrally forming fastening elements on film or sheet;
  • Figure 2 is an enlarged schematic elevational view of a sheeting die and fastening element, die block and plate as illustrated as part of the extrusion apparatus of Figure 1;
  • Figure 2A is a frontal view of the die block of Figure 2 showing a mechanism for adjusting the die block location;
  • Figure 3 is an enlarged schematic bottom view looking in the direction of line 3-3 of Figure 2 showing a plurality of die blocks and plates as associated with the film or sheeting die and particularly illustrating the fastening element die slots and the sheeting die orifice;
  • Figure 4 is an enlarged cross-sectional view of the film or sheeting die and fastening element die plate taken along section 4-4 of Figure 3 illustrating the extrusion of the film or sheeting stock as it is combined with a fastening element and its base, a modified arrangement of a die plate being shown in dotted lines;
  • Figure 5 is a view like Figure 4 showing the die plate spaced from the film or sheet die by an intervening shim;
  • Figures 6 and 7 are similar to Figure 5 with the location of the die plate changed.
  • Figures 4P, 5P, 6P and 7P are enlarged schematic cross-sectional views of representative female profiles formed by positioning the dies as illustrated in Figures 4, 5, 6 and 7, respectively.
  • Figure 8 is an enlarged cross-sectional view of an alternative embodiment of a film or sheeting die and die plate, similar to the die illustrated in Figure 4.
  • Figure 9 is a planar view of the die plate or profile plate taken along section line 9-9 of Figure 8.
  • Apparatus 10 illustrated in Figure 1 comprises a conventional screw extruder 12.
  • Extending outwardly from extruder 12 is an extruder pipeline 14 for feeding a synthetic resin to a main sheeting or film die 16.
  • die 16 will hereinafter be called film die even though it is capable of extruding either a film or a sheet usable in this invention.
  • Feeding from extruder pipeline 14 is a second extruder pipeline 18 which, through pump 20, supplies resin to a plurality of die blocks 22.
  • Each die block 22 and an associated die plate 52 provide an extrusion path for extruding fastening elements which combine with the film leaving the film die 16.
  • This apparatus permits the extrusion and fusion of fastening elements with strips of film at their base to a sheet or film extruded from the film
  • the fastening elements, base and film are represented by reference characters 48, 50, 46, respec ⁇ tively, as illustrated in Figures 1, 2 and 4P. These elements combine extremely close to the extrusion die lips, the joining locations illustrated in Figures 1 and 2 being exaggerated only to show that they extrude as separate components.
  • the apparatus is capable of making cast film with multiple sets of generally U-shaped and generally arrow-shaped fastening elements, shaped like those shown in U.S. Patent No. 3,340,116, for example, integrated with the thickened base strips of film later described in detail.
  • An air jet 24 and/or air knife 26 can be used to assure good contact of the film and fastening elements with a chill roll 28 while screens or shields (not shown) can optionally block air flow in front of each fastening element to prevent distortion of the malleable extrusion.
  • the air jets above the air knives pin the edges of the drawn film extrusion to the chill roll to reduce ⁇ narrowing of the film and thickening of the film edge.
  • Below air knife 26 preferably are located water jets 30 which are aligned with each of the fastening elements to cool the same. It may be desirable to add second water jets 32 located on the side of the chill roll opposite from the air knife to be certain that the fastening elements are fully cooled before the same are wound.
  • the combined film/fastening elements are taken off the chill roll and passed across a grooved roll 34, which can contain water suction means, and are then passed over a second take-off roll 36 which can contain a vacuum assist to hold the film closer thereto.
  • a grooved roll 34 which can contain water suction means
  • a second take-off roll 36 which can contain a vacuum assist to hold the film closer thereto.
  • an air jet mechanism 38 Located adjacent the roll 36 is an air jet mechanism 38 to remove any excess water remaining on the extruded film fastening elements after they leave roll 36.
  • the lower end of the air jet mechanism contains a flange or tongue 39 extending below the vertical tangent point of roll 36.
  • the air jet (see arrows) makes tangential contact with the extruded film/fastening element combination.
  • the air jet velocity between the tongue and roll atomizes the water which separates from the film along the path of the tongue.
  • the film/fastening element combination is taken to a wind-up roll (not shown) or to a mechanism (not shown) for actually forming containers from the film/fas ening element combination.
  • FIGs 2 to 4 show more detailed views of the sheeting die 16 and fastening element die block 22 illustrated in Figure 1.
  • Polymer entering channel 40 from pipeline 14 extrudes outwardly from film forming slot 56 past corners 42 of die lip 62 adjacent the lower end of the sheeting die 16.
  • Die block 22 is secured to the side of the film die 16 with bolts 25 extending through slot 23.
  • the die plate 52 is bolted to the bottom surface of die block 22.
  • a plurality of die bolt holes 27 allow for varying placement of the die blocks, and the slot 23 in each die block allows for adjustment of the die block with respect to each bolt.
  • Each die block 22 is placed so that a lower or leading edge 74 of the die plate 52 is below the die lip 62 of film die 16.
  • Resin from pipeline 18 passes through a channel 44 which is disposed angularly within the die block 22 and is extruded through profile orifices 68 and 70 in die plate 52 and meets with the film 46 immediately adjacent the lowermost extent of die lip 62 of the film die thereby joining the fastening elements 48 and base 50 to form the film/fastening element combination 46, 48 and 50.
  • the angular disposition of the exit of the channel 44 increases the acuteness of 5 the angularity of the extrudate issuing therefrom so as to increase the closeness of the joining of the film/- fastening element combination.
  • Die block 22 carries female die plates 52 and 52', having left and right hand female profile orifices
  • Figures 4 and 5 are enlarged detailed drawings of the arrangement of the film die 16 and die plate 52 schematically showing how closely it is believed the film/fastening element unites adjacent to the die lip 62. If film die 16 and die plate 52 are properly
  • a fundamental problem in extruding a fastening element on cast film is to obtain satisfactory adhesion of the element to the film. It has been discovered that the closer the fastening element can be joined to the film as the latter issues from the film die, the better the chances are that satisfactory adhesion will occur, particularly at high speed extrusion rates.
  • Figure 4 illustrates a particular arrangement which has been found to permit high speed extrusions, in excess of 200 feet per minute, while obtaining satisfactory film/fastening element adherence as typified by Figure 4P.
  • the distance "T" of the die lip As short as practical and to have the base 50 angularly disposed towards film 46.
  • the distance T should not be so short, however, that the die lip 62 forms a knife edge, which is easily subject to damage.
  • a relatively wide distance T of from about 0.0508 cm (0.020 inch) to 0.0762 cm (0.030 inch) has been found practical because of the angularity of extrusion built into the apparatus by this invention.
  • the extrusion of film 46 can also be angled towards the extrusion of the base 50 by the relative location of the extrusion channel, as the film exits at end corners 42, with respect to the chill roll 28. For example, by locating the extrusion channel back a dis ⁇ tance "d" from a vertical tangent point of the chill roll 28, and a distance "h” from a horizontal tangent point of the chill roll 28 ( Figure 1), the angle ⁇ of the film extrudate 46 with respect to the vertical can be varied.
  • the die plate can slide up and down on the angular face 80 before being clamped in position, as shown in Figures 2 and 2A.
  • the lower or leading edge 74 of die plate 52 can be located at a desired position with respect to an adjacent film surface 76. This, therefore, determines not only the angular disposition of the base 50 with respect to the film 46, but also the closeness of the two when they engage.
  • the distance between the film surface 76, (shown extended by a dotted line in Figure 4) and die plate leading edge 74 is designated as distance "y".
  • the gap distance between the face 80 of the film die 16, at an edge 73 of die lip 62 from an inner face 84 of the channel 44 is designated ⁇ * x ** .
  • the bevel or angle a is the angular relationship between faces 80 and 84.
  • a run was made under the same conditions as Run 7 of Table 1 except that the gap dimension x was set at 0.0508 cm (0.020 inch), to provide the best chance for adhesion, but with the leading edge 74 of the die plate being flush with the die lip 62 of the film die.
  • bottom surface 81 of the die plate is angularly or horizontally disposed from edge 74.
  • the profile achieved with the run of Figure 5 is represented by Figure 5P, Figure 6 by Figure 6P and Figure 7 by Figure 7P.
  • the adhesion of base 50' to film 46 as shown in Figure 5P leaves large holes or unadhered sections and results in a clearly unsatisfactory profile.
  • the adhesion shown between base 50" and film 46 shown in Figure 6P is improved, at least on one side, but the profile still remains unacceptable because of the poor adhesion on the other side.
  • distance y is decreased in the Figure 6 run as compared to the Figure 5 run.
  • adhesion between base 50''' and film 46 becomes greatly improved.
  • the profile is satisfactory for commercial purposes as adhesion occurs over at least 90 percent of the base width. Additional runs where distance y was reduced further, even to a negative dimension, i.e., as shown in phantom in Figure 4, with all other conditions being the same as run Figure 7, found adequate adhesion and produced satisfactory profiles.
  • leading edge 74 of the die plate not only is below but is located laterally inwardly toward film surface 76 with respect to edge 73 of the film die for satisfactory adhesion to occur.
  • leading edge 74 is located outwardly of edge 73, as shown in Figure 5, or even directly below edge 73, as shown in Figure 6, unsat ⁇ isfactory adhesion occured (as illustrated in Figures 5P and 6P, respectively).
  • the leading edge 74 is located both below and inwardly of edge 73, the polymer stream through channel 44 is urged towards the die lip 62 and the film 46 to achieve early joining.
  • the film can be cut and sealed to form containers in the conventional manner.
  • the arrangement of Figure 3 makes it possible to form two containers or bags because the film is provided with two sets of male and female fastening elements. Other combinations of fastening elements and spacing on a single film can be achieved with the apparatus of • this invention.
  • the sheeting or film die 16a is provided with a film forming slot 56a for extrusion of the film or sheet.
  • the die is provided with a die lip 62a adjacent the terminal end of the slot 56a to form a die lip similar to the lip 62 illustrated in Figure 4.
  • the die of Figure 8 differs from the die of Figure 4 in that the die 16a is provided with an integral feed channel (44a) within the die body for feeding thermoplastic meterial through the internal channel 44a to a die plate or profile plate 52a posi ⁇ tioned within a terminal cut out portion (90) provided in the die lip (62a).
  • the plate 52a is illustrated in plan view in Figure 9 and shows an extrusion slot portion 92 for forming the male profile of a fastening element.
  • a base portion of the fastening element is integrally formed with the male profile when extruding the thermoplastic material through an open sided slot portion 94, which is cut into an inner edge surface 96 in the plate 52a.
  • the outer surface of the die plate 52a forms an extension of the die lip (62a).
  • the channel (44a) is positioned at an acute angle with respect to the film slot 56a such that the fastening element is formed by and extruded through the die plate at an acute angle with respect to the adjacent surface of the film extruded through the slot (56a).
  • the advantage of this modified die construction is that the base forming extrusion through slot portion 94 joins the main melt stream for the film within the die (16a) with the result that improved adhesion between the base of the fastening element and film are obtained.
  • This is a particular advantage where the overall thickened layer of the film and base decrease in thickness adjacent the extremities of the base.
  • a further advantage in the die construction of Figure 8 is that the combining of the (adhering) thermoplastic streams of the film and fastening element takes place within the die and before the streams pass the die lip (62a).
  • Additional advantages of the present invention are that it makes possible the forming of fastening elements on cast film at higher speeds than heretofore possible. It permits forming of a base for the fastening element in a cast process so as to present a more rigid, relatively non-rotatable element which greatly facilitates interlocking between the male and female elements. It permits the use of a relatively wide die lip so that the die lips are less subject to damage (than if they were of a knife edge or narrow configura ⁇ tion) without sacrificing adhesion between the fastening element and the film.
  • the invention allows for variations in the base and male and female pro iles. These may be formed from separate polymer sources, making it possible to form the fastening elements of different materials than the film itself.
  • the film or sheet stock and/or fastening elements can be made of various other synthetic resinous materials, the size, color and shape of the components can be varied, the number of fastening elements extruded onto a film or sheet can vary, the actual design and configuration of the container can vary, from flexible bags to rigid containers, and equivalent hardware can be substituted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

Procede ameliore de moulage a haute vitesse pour le fusionnement de dispositifs de fixation, avec des bandes de film a leur base, pour extruder separement du materiau brut en film ou en feuille pour la fabrication de conteneurs avec des moyens de fermeture solidaires. Le procede permet d'obtenir une multitude d'ensembles d'elements males et femelles de fixation, avec un espacement variable, dans une operation d'extrusion simple. L'appareil (10) est concu pour que l'adhesion entre les elements de fixation (48) et le film (46) ou la feuille se produise tres pres des levres de la matrice (62) avant qu'un refroidissement important du produit d'extrusion ne se produise. Des conteneurs avec des profils ameliores sont obtenus parce que la base permet aux profils de rester relativement rigides pendant la fermeture et l'ouverture.
EP81901627A 1981-04-20 1981-04-20 Procede et appareil de formation d'un element de fermeture solidaire pour un conteneur thermoplastique Withdrawn EP0077772A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1981/000515 WO1982003597A1 (fr) 1981-04-20 1981-04-20 Procede et appareil de formation d'un element de fermeture solidaire pour un conteneur thermoplastique

Publications (1)

Publication Number Publication Date
EP0077772A1 true EP0077772A1 (fr) 1983-05-04

Family

ID=22161192

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81901627A Withdrawn EP0077772A1 (fr) 1981-04-20 1981-04-20 Procede et appareil de formation d'un element de fermeture solidaire pour un conteneur thermoplastique

Country Status (3)

Country Link
EP (1) EP0077772A1 (fr)
AU (1) AU7324281A (fr)
WO (1) WO1982003597A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030106635A1 (en) * 2001-12-10 2003-06-12 Mladomir Tomic Method for manufacturing a resealable bag

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1084488A (fr) * 1952-09-30 1955-01-19 Dispositif d'attache
US3340116A (en) * 1960-04-11 1967-09-05 Seisan Nipponsha Kk Method and apparatus for manufacturing synthetic resin tubular film having occludentmeans in the inside surface thereof
GB994307A (en) * 1961-11-27 1965-06-02 Seisan Nipponsha Kk Material for forming plastics bags and bags made therefrom
US3338284A (en) * 1963-07-22 1967-08-29 Ausnit Steven Sheet with fastener structure
US3462332A (en) * 1965-03-05 1969-08-19 High Polymer Chem Ind Ltd Method of continuously providing a fastener on a thermoplastic film
US3579730A (en) * 1965-10-22 1971-05-25 Steven Ausnit Apparatus for making a web having integral interlocking rib and groove portions
US3403429A (en) * 1966-11-09 1968-10-01 Smith George Walter Henry Strip fastening means
US4259133A (en) * 1973-03-13 1981-03-31 Minigrip, Inc. Method and apparatus for making profile sheets
US3945403A (en) * 1973-04-19 1976-03-23 Minigrip, Inc. Tube construction for fastener profile strips

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8203597A1 *

Also Published As

Publication number Publication date
WO1982003597A1 (fr) 1982-10-28
AU7324281A (en) 1982-11-04

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