MXPA97006540A - Packing container made of a car containment preform - Google Patents

Abstract

A lower end closure of a cardboard package to be heat and pressure sealed has four substantially rectangular sections of which the sections are divided by the marked lines in the interior, triangular reactions and the triangular exterior subsections and have central lugs formed by pairs of small, rectangular subsections that provide gas tightness in pencils A1 and A2 in the sealed closure, the marked lines provide lines of weakness through the full widths of the roots of the central handles, so that the handles when each is folded on itself, it can be adjusted to the orientation of a section bent outward during the fold of the section inwards of the lugs, which are interspersed between the sections, in the preform, the lugs and the sections are dimensioned so that they can be interlaced with the corresponding handles and section Ions of the lower parts of a row of identical preforms, the edge sections of the projecting portions of the section begin adjacent and parallel to the vertical edges of the section and continue convexly curved towards the section, to operate in conjunction with the folds between the section, on the other hand, and the subsections, on the other hand, to improve the production and maintenance of the proper alignment of the

Description

PACKING CONTAINER MADE OF A CARTON CONTAINER PREFORM DESCRIPTIVE MEMORY This invention relates to a container for packaging of sheet material and a preform from which the container can be made. The preforms and the cartons according to, or virtually in accordance with, the present Figures 1 and 2 are conventional. US-A4, 192,446 discloses preforms and carton packs according to the present Figures 3 and 4. GB 0-2,176,676 discloses preforms and cartons according to the present Figures 5 to 7. According to one aspect of the present invention, there is provided a sheet material preform from which a container for packaging can be made, comprising: a row of body sections comprised of the first, second, third and fourth sections, and a row of end closing sections, substantially rectangular, extending substantially parallel to said row of body sections and constituted by the first, second, third and fourth final closing sections of which each of the closing sections final first and third have the oblique lines of first and second weakness that divide their section into a central subsection of substantially isosceles triangle form and two subseccio end frames of substantially triangular shape, with each of the first and third end closure sections including a central handle projecting centrally outwards with respect to its section thus skirting the respective cavities in the outermost area of the edge of its section, including the second final closing section a central handle projecting centrally outward with respect to its section, the handles protruding from the first, second and third final closing sections of the longitudinal centerline of said row of body sections substantially in the same extent the one and the other, and projecting the fourth closing section of said central line at least to the same extent as said handles, characterized in that said central handle of said second final closing section borders the respective cavities in the outermost region of the edge of its section, being bordered those cavi also by the respective edges of said second final closing section extending in the same general direction as said row of body sections, and in that said handles of the first, second and third final closing sections and the edge area of said fourth final closing section which is the furthest from said longitudinal centerline are digested so that such lugs and such edge areas of a first row of preforms identical to said preform may be interlaced with corresponding lugs and corresponding edge areas of a second row of preformed sheets each identical to said preform. Due to this aspect of the invention, it is possible to significantly reduce the amounts of waste material produced during the production of said preforms, while still providing gas tightness to the final closure. According to a second aspect of the present invention, there is provided a preform of sheet material from which a container is to be made, comprising: a row of body sections constituted of the first, second, third body sections and fourth, and a row of end closing sections, substantially rectilinear, extending substantially parallel to said row of body sections and consisting of the first, second, third and fourth final closure sections of which each of the first and third final closure sections has oblique lines of first and second weakness that divide their section into a central subsection of substantially isosceles triangle shape and two extreme subsections of substantially triangular shapeeach of said first and third final closing sections including a central handle projecting centrally outward with respect to its section and thus skirting the respective cavities in the outermost area of the edge of its section, including the second final closing section a central handle projecting centrally outwardly with respect to its section, and portions protruding outwardly on the respective opposite sides of said central handle of said second final closing section to project beyond the respective adjacent free edges of said sections of final closure first and third, the handles protruding from the first, second and third final closing sections of the longitudinal center line of said row of body sections substantially in the same extent as both, and projecting the fourth final closing section of said central line at least in the same extended n that said lugs, further characterized in that said outward projecting portions have the respective edges that start substantially perpendicular to said central line of said row of body sections and continue towards said central lug. According to a third aspect of the present invention, a container for packaging of sheet material is provided, which includes: a succession of body portions constituted of the first, second, third and fourth body portions, and a final closure that includes the substantially rectangular inner and outer wall portions, extending from the respective edges of the first and third body portions, the outer portion overlapping the inner portion externally of said inner portion, also including the first and second groups of substantially triangular wall portions, the first and second groups of the substantially triangular wall portions comprising respective, substantially triangular, inner wall portions extending from the second and fourth body portions, respectively, to the respective apices adjacent to each other, and the respective pairs of portions of outer walls, substantially triangular, extending from the respective substantially triangular interior wall portions, and from the substantially rectangular inner and outer wall portions, the first and second handrails extending substantially parallel to each other. another from the respective pairs of outer wall portions, substantially triangular, in the areas of said respective apices and bent each on itself, including the substantially rectangular inner wall portion, which includes a third handle that projects centrally with with respect to the remainder of that portion of wall and bent back face to face on said rest and sandwiched between said remainder and said outer wall portion, substantially rectangular, with interposition of said first and second lugs between said third lug and said wall portion outside, substantially rectangular, and also including the portion of inner wall, substantially rectangular, protruding portions on the respective opposite sides of said third handle and directed from said third handle, characterized in that said protruding portions are interspersed between said portion of outer wall, substantially rectangular, on the other hand, and the respective of said outer portions, substantially triangular, on the other hand, and have the respective lateral edges starting immediately adjacent and substantially parallel to the respective fold lines between said outer wall portion, substantially rectangular, on the other hand, and said respective said outer wall portions, substantially triangular, on the other hand, and continue towards said third handle.

Due to these two aspects of the invention, it is possible to improve the production and maintenance of said proper alignment of the final closure, among which the hermeticity to the gases thereof is still provided. According to a fourth aspect of the present invention, a preform of sheet material is provided from which a packaging container is to be made, comprising: a row of body sections constituted of the first, second body sections , third and fourth, and a row of end closing sections, substantially rectangular, extending substantially parallel to said row of body sections and constituted of the first, second, third and fourth final closing section of which each one of the first and third final closing sections have the oblique lines of first and second weakness that divide their section into a central subsection substantially of isosceles triangle and two extreme subsections of substantially triangular shape, including in each of said sections of final closure first and third a central handle protruding centrally outward with respect to its section and thus skirting the respective cavities in the outermost area of the edge of its section, projecting outward the second final closing section, characterized in that the respective lines of weakness extend to the full widths of the roots of the central lugs. According to a fifth aspect of the present invention, a container for packaging of sheet material is provided, which includes: a succession of body portions constituted of the first, second, third and fourth body portions, and a final closure that includes the substantially rectangular inner and outer wall portions, which extend from the respective edges of the first and third body portions, overlapping the outer portion of the inner portion externally of said inner portion, & also including the first and second groups of the substantially triangular wall portions, the first and second groups of the substantially triangular wall portions comprising respective, substantially triangular, inner wall portions extending from the second body portions and fourth, respectively, to the respective apexes adjacent to each other and respective pairs of substantially triangular outer wall portions, extending from the respective substantially triangular interior wall portions, and from the interior wall portions and external, substantially rectangular, the first and second lugs extending substantially parallel to each other from the respective pairs of the outer wall portions, substantially triangular, in the areas of said respective apices and bent each on itself, It includes The interior wall portion, substantially rectangular, a third handle bent back face to face over the remainder of that wall portion sandwiched between said remainder and said outer wall portion, substantially rectangular, with the interposition of said first and second handholds between said third handle and said outer wall portion, substantially rectangular, characterized in that the respective lines of weakness, each folded on itself, extend over the full widths and the roots of the first and second handles. Due to these two aspects of the invention, it is possible to reduce the risk of malformation of the middle part of the final closure. In order that the invention can be clearly understood and easily carried out, reference will now be made, by way of example, to the accompanying drawings, in which: Figure 1 is a plan view of the interior part of the invention; known preform from which a carton must be made p >To pack liquids, Figure 2 is a fragmentary, bottom, perspective view of the lower end closure of the known carton in folded condition prior to pressure sealing, Figure 3 is a plan view of the inside of another preform. known from which a known carton is made to pack liquids, Figure 4 is a view similar to Figure 2, but from that other known carton, Figure 5 is a fragmentary plan view of the outer side of another known preform from which another known cardboard package for packaging liquids has to be made, Figure 6 is a view similar to Figure 2, but from that other known carton, Figure 7 is a similar view to the Figure 5, but from a modified version of that other known preform, Figure 8 is a fragmentary plan view of the inside of a first embodiment of a preform according to the invention, Figure 9 is a plan view of the inner parts of six preforms each according to Figure 8, as they are formed by cutting and marking from a continuous sheet, Figure 10 is a plan view of the outer part of the closure sections of a second embodiment of a p »reform according to the invention, and which particularly identifies the sections, Figure .1.1 is the same as Figure 10, which however identifies in particular the marked lines, Figure 12 is the same Figure 10, which however identifies particularly the edges of the preform, Figure 13 is a fragmentary perspective view of a carton pack sleeve of the second embodiment of the invention, Figure 14 is a view similar to the figure 2, but of the lower end closure of the carton of the second embodiment of the invention, Figure 15 is a bottom plan view of the lower end seal sealed to heat and pressure of the container of cardboard of the second embodiment of the invention, Figure ld is a top plan view of the final closure of figure 15, and figure 17 is a view corresponding to figure 9, which nevertheless shows six preforms each according to with figure 10. Figures 1 and 2 illustrate a conventional preform and carton used for products with respect to which the penetration of gas through the carton inwards or outwards is of minor importance, for example products that have to be consumed shortly after packing. The preform and the carton can be made of cardboard type polyethylene to pack. The preform comprises a row of body sections Pl a P5 and a parallel row of lower end closing sections. The latter consist of four substantially rectangular sections PB; P7 / P9; P12; and P14 / P16 connected to the respective sections Pl to P4 for respective lines marked SI, 58, Sil and 518 parallel to the longitudinal centerline of the preform. Sections P7 / P9 and P14 / P16 comprise two groups of triangular subsections P7 to P9 and P1 to P16 of which the central subsections P8 and P15 are connected, substantially of isosceles triangle, to the respective sections P2 and P4 through of the lines marked S8 and 518. Connected to subsection P8 through the respective oblique lines marked 53 and S7 is a pair of triangular subsections P7 and P9 connected themselves to subsections P6 and P12 through the respective lines marked S2 and S9 perpendicular to the longitudinal center line of the preform. The triangular subsection P15 is connected, through the respective oblique marked lines S13 and S17, to the respective triangular subsections P14 and P16, which are themselves connected to the subsection P12 and a substantially rectangular section P19 through the respective marked lines S12 and 519 perpendicular to the longitudinal centerline of the preform. Also connected to the sections Pl to P5 are the respective upper closing sections P30 to P41 of the final closure and the upper sealing sections P50 to P56 of the final closure. As is well known, in the formation of a filled and sealed carton from the preform, sections P5, P19, P40, P41 and P56 are sealed by heat and pressure to the area on the right-hand end of the sections Pl, PB, P30, P31 and P50, respectively, to form a cardboard package sleeve with a side joint. The sleeve of the carton is placed on a mandrel, the lower end sections protruding axially from an axial end face of the mandrel, then the marked lines 51, 53, 57, S8, Sil, S13, S17 and 518 are cut making turn the sections and subsections P6 to P19 relative to one another, then heat the appropriate sections of the sections and subsections PB to P19 to make them sticky, then the sections and subsections PB, P8, P12 and P15 are folded in an appropriate sequence to produce approximately the condition shown in Figure 2; then a pressure plate is applied to the substantially rectangular section P12 and the substantially rectangular inner section P6 to press them against the triangular subsections P7 to P9 and P14 to P13 and to press all the lower end closing sections to the subsections P6 to P19 between the pressure plate and the mandrel, to seal them together under pressure. The closed carton is then advanced through its lower part to an upper pre-cut station, where the marked lines of the upper end closure are pre-cut, and then one or more filling stations are advanced where the carton it is filled with the product, for example liquid. The filled carton is then advanced to the upper heating station, where appropriate portions of sections P50 to P56 are heated and thus made sticky, after which the upper closing sections P30 to P41 and P50 to P56 are bent inward and sections P50 and P56 are press-sealed against each other to form a sealing burr. The sections and subsections P6, P7, P9, P12, P14 and P16 have the free edges E30 to E35, respectively, extending parallel to each other and to the longitudinal centerline of the preform. The section P6 also has the chamfered edges E36 and E37 which diverge inwardly from between the respective ends of the edge E30 and ending in the free edges E38 and E39 which extend parallel to each other but perpendicular to the longitudinal center line of the preform The section P12 has an oblique free edge E40 extending from one end of the edge E33 to the adjacent end of the line marked 12. It will be noted that the edges E30 and E33 protrude beyond the edges E31, E32, E34 and E35, which They are colinealee with each other. The dimensions of the sections and subsections P6 to P19 are such that the handle of the section PB bordered by the edges E30 and E36 to E39 may enter between section P12, on the other hand, and subsections P9 and P14, on the other hand and that, when the sections and subsections PB to P19 have been pressed between the pressure plate and the mandrel, the edges E31 and E32 are adjacent to one another over their lengths, as are the edges E34 and E35. As the handle bordered by the lines marked E30 and E36 to E39 enters between the section P19 and the subsections P9 and P14, at least one of the chamfered edges E36 and E37 serves as an entrance for the handle, in relation to the folds in the frames. lines marked 539 and 519, to give the proper alignment of the closure. This self-alignment is improved by the edges E31 and E32, and the edges E34 and E35, being subsequently adjacent to each other. While the preform and the carton package described with reference to Figures 1 and 2 provide good proper alignment of the lower end closure, which favors the diesensively correct sealing of the lower end closure and also favors the production of a carton dimensionally correct, the middle part of the edge E30 and those portions of the edges E31 and E32 at the apex Al and the edges E34 and E35 at the apex A2 are exposed to the product and, since they are cut edges, the porous board is also exposed to the product. This has the disadvantage that, in those places, gases and possibly liquids can penetrate through the carton. In order to provide a carton pack having a lower end seal which is gas tight with respect to the lower end closure of the carton of Figures 1 and 2, it is known from document US-A-4192446 about the provision of a preform and a carton according to Figures 3 and 4. In the preform shown in Figure 3, subsections P7, P9, P14 and P16 have been prolonged only in the respective areas of the apices Al and A2 for provide two central handles that include the respective small subsections, rectangular PÍO and P18 respectively bordered by the marked lines S5 and 515 that extend centrally of the respective handles from the apices 01 and R2 and bordering the marked lines S4 and S16 respectively the subsections P7 and P1B. Formed symmetrically at the edge E33 of section P12 are the two grooves NI and N2 that leave between them a central handle in the form of a section P13 bordered by a marked line S16 extending between the apices of the grooves NI and N2 and which leave beyond them two outer projecting portions bordered by the respective chamfered edges E41 and E42. The central handle in the shape of section P13 is at least the width of each of the other two central handles. A conventional thinner strip is formed by subsections P40a, P5a and P19a in Figure 3. As indicated in Figure 4, when the lower end closure is folded inward, section P13 is rotated about the line marked SIO toward back and outwardly on the outer surface of section P12, so that there is no longer a cut edge exposed to the product in the middle part of the outer edge of section P12. In addition, the small rectangular subsections PÍO and P18 are bent backwards on the outer parts of the extensions of subsections P9 and P14, so that, at the apices Al and 02 formed by the respective groups of subsections P7 to PÍO and P14 a P18, there are no cut edges that have to be exposed to the product in the carton. The two bent central handles that include the PIO and P18 subsections come to overlap the section P13 on its outer side and the outermost area of the edge of the section PB becomes located on these two handles. The two projecting portions surrounded by the edges E41 and E42 and the notches NI and N2 are inserted between the sections PB and P9 and the sections P14 and P15, respectively, and the lower end seal is sealed. However, in this final closure there is virtually no proper alignment interaction between sections PB and P12. As a result, the sealing of the lower end closure too often is miscalculated and the open top carton thus produced is also very often incorrectly sized, although, compared to the final closure of the carton of Figures 1 and 2, a relatively good gas-tight seal of the lower final closure is obtained, provided that the seal is not dimensioned incorrectly. Still, as section P13 is bent backwards it folds inwardly from the two bent handles, those handles must be able to adjust their orientation to that of section P13; however, the two extensions of subsections P9 and P14 are resistant to rotation with respect to the remains of their sections P9 and P1, with the result that sometimes the malformation of the central part of the lower end closure takes place. In addition, in the preform, the dimensions of these two handles, the notched zone outside the edge of the section P12 and the outermost edge area of the section P6 are such that they can not be interlaced with the corresponding elements of one or more identical preforms (not even with the protruding portions of sections P52 and P53). Again, in order to provide a carton pack having a lower end seal that is gas tight with respect to the lower end closure and the carton of Figures 1 and 2, it is known from GB-A-2176767 about of the provision of a preform and a carton according to Figures 5 and 6, or a preform and a carton from which the preform is in accordance with Figure 7. In the preform shown in Figure 5, the section P12 protrudes only to the same extent as subsections P9 and P14, but from section P12 a section P13 in the form of a tongue connected to section P12 again protrudes through a line marked SIO parallel to the line marked Sil, while cuts are formed in section P12 at the respective ends of section P13 to provide the cut, free edges E12 and E16 obliquely to the line marked SIO. In addition, subsections P7 and P16 are arranged to project outwardly beyond the respective subsections P9 and P14. The projecting portions of the subsections P7 and P16 are connected to the respective subsections P9 and P14 through the small rectangular subsections Pll and P17, which are connected to the subsections P7 and P16 through the lines marked 55 and S15, respectively, and subsections P9 and P14 through the lines marked S6 and S14. As indicated in Figure 6, when the lower end closure is folded inward, the section P13 is rotated around the line 510 marked backward and outward on the outer side surface of section P12, so that there is no longer a cut edge exposed to the product and the middle part of the outer edge of section P12. In addition, the small rectangular subsections Pll and P17 are bent backwards on the outer sides of the extensions of subsections P7 and P16, so that, at the apexes 01 and 02 formed by respective groups of the subelections P7 to Pll and P14 to P17, there are no cut edges that have been exposed to the product in the carton. However, in this final closure, subsection P6 becomes located on the subelections P7 and P16, which become located on the sections P12 and P13, and the section P12 becomes located on the subsections P8 and P15. This has the disadvantage that there is practically no proper alignment interaction between sections P6 and P12 and between subsections P14 and P1B and subsections P7 and P9, respectively. As a result, the lower end closure seal is often incorrectly dimensioned and the carton with the top part thus opened too often too poorly sized, although, compared to the final closure of the carton of Figures 1 and 2, a relatively good gas-tight seal of the lower final closure is obtained as long as the seal is not incorrectly dimensioned. Still, as the backward-bent section P13 is folding into sections Pll and P17, supported by the outermost edge areas of the subelections P7 and P16, those elements must be able to adjust their orientation to that of the section. P13; however, the two positions of subsections P7 and P16 are resistant to rotation with respect to the remains of subsections P7 and P16, with the result that malformation of the central part of the lower final closure sometimes takes place. rtheless, in the preform, the dimensions of the outermost zones of the edge of the sections P7 and P16 extended by the subsections Pll and P17, the outermost zone of the edge of the section PB, and the section P13, are such that they do not they can be interlaced with the corresponding elements of one or more identical preforms. Figure 7 shows a different arrangement of the parts of the lower closure of the side sealing strip P5, P19, etc. In spite of this, the same lower structure is formed after folding as in Figure 6. Referring to Figure 8, in order to retain the relatively good gas-tight property of the lower final closure of Figure 4, the central handles of the substantially rectangular sections P7-P9 and P14-P16 have been retained, but the lines marked S4 and S16 have been extended as the respective lines marked 56 and 514 to form the lines of weakness S4, S6 and S14, S16 through all the widths of the roots of those two central handles, leaving the respective small rectangular subsections Pll and P17 connected to the subsections PÍO and PÍO by the lines marked 55 and S15, respectively, and connected to the subsections P9 and P14 through the lines marked SB and 514, respectively, with which those two central handles are cap >; aces of better way to adjust to the orientation of section P13 while the latter is folding inward of the two handles; even so, the characteristic of the absence of cut edges from the apexes Al and 02 is retained, and in addition the cut edges E4 and E9 of subsections P7 and P9 are adjacent to their lengths, as well as edges E19 and E24 of the subelections P14 and PIB, when the lower subsections of lower closing and the subsections PB and P19 are pressed together between the pressure plate and the mandrel, thus favoring the proper alignment of the lower final closure. Another advantage of providing only central handles as extensions of the sections P7-P9, P12 and P14-P1B is that the lower parts of the preforms can be sized to fit very closely, as shown in Figure 9, thereby reducing the cardboard cuts to pack. As shown in Figure 9, the narrow accommodation consists of the entanglement between the section P6; the pair of subsections PÍO and Pll; section P13; and the pair of subsections P17 and P18 of a preform and the pair of subsections P17 and P18; section P13; the pair of subsections PÍO Y Pll; and the PB section of another preform, in that order. The embodiment shown in Figures 10 to 17 differs from that shown in Figure 8 in that the portions of the Eli and E17 edges of the P12 section near the respective PIB and P7 subeections in the laterally bonded carton project beyond. the cut edges E24 and E4 of subsections P16 and P7, respectively. In the laterally attached carton, the portions of the edges Eli and E17 start immediately adjacent and parallel to the respective lines marked S19 and 512 and continue convexly curved towards the section P13. These two curved projecting parts operate in conjunction with the respective bends provided on the lines marked S2 and S9, respectively, between the section PB and subsection P14, and between section P6 and subsection P9, so that an entry of these occurs. protruding parts between the respective subsections P14 and P9 and the section PB just before the edges E4 and E9 and the edges E19 and E24 are adjacent to each other to provide a reinforcement between those folds once the edges E4 and E9 and the edges E19 and E24 have become adjacent to each other. These input and reinforcement effects therefore improve the production and maintenance of the proper alignment of the lower general closure. Figure 17 illustrates that the preforms according to Figures 10 to 12 can be closely fitted together from bottom to bottom, except that in this case the entanglement by any of the prefor e significantly overlaps two opposite preforms. Referring particularly to the version of Figures 10 to 17, the following advantages are obtained in the following ways: Advantage I - A lower final closure relatively gas-tight; this is obtained because the lower final closure is designed in such a way that there is no contact between the lower final closure board and the product. In this respect, the following features are of importance: (1) the thinned longitudinal edge of the sealing strip (2) the subsections PÍO, Pll, P17 and P18 protect the tips of the subelections P7, P9, P14 and P16. (3) Section P13 protects the edge of section P12. (4) The highest section P6 covers the edges of the other sections from below. (5) The lines marked S5 and S15 and the edges E4, E9, E10, E18, E19, E24 and E25 are positioned relative to the longitudinal center line of the preform in such a way as to cause stresses on the adjacent edges in the final closure. (6) The relative positions of the line marked SIO, on the other hand, and the lines marked S4, S6, S14 and S16, on the other hand, are adjusted depending on several properties of the preform, for example on the thickness of the cardboard . (7) The edge E25 is positioned in such a way that it causes tension against the edge E3 through the section P12 when the pressure seal takes place. Advantage II - a lower configuration of its own alignment. The following features are of importance: (1) This proper alignment in two directions perpendicular to each other and both contained in the plane of the closure. Such a proper alignment that is ensured by the boards that meet each other and locking in exact positions: in one direction: the edge E4 meets the edge E9, the edge E19 meets the edge E24, the folds of the lines marked S4 and S16 is found to be bent in the line marked SIO; in the other direction: the bend of the marked line S2 is directed outwardly by the edge Eli to come to rest on the edge El, the bend produced in the line marked S9 is directed by the edge E17 to rest on the edge E18; again, edge E25 is directed and pushed outward by edge E3 under pressure. (2) See feature 1 (5). (3) See feature 1 (6). Advantage III - It is easier to fold the lower sections together. Traits 11 (1) to 11 (4) are significant. Another significant feature is that the connected lines S6 and S14 favor the symmetrical fold. Advantage IV - cracking is discouraged, with bending or heat sealing and pressure of any barrier layer (eg aluminum or EVOH). The following features are of importance: (1) Section P19 is folded along flat section P12 and not folded section P7-P9 or P14-P16. (2) The distance between the marked lines S4 and S16 and the line marked SIO is in accordance with the bending angles and the properties of the preform, to ensure airtightness and bending on the center line of the lower configuration. (3) The widths and depths of the marked lines are appropriate for the bending angles and the properties of the preform. Advantage V - the marked lines reduce the cracking of the folds and promote the best sealing. The following features are significant: (1) The lines marked S6 and S14 serve to lighten the tension on the sequences P9 and Pll, and P14 and P17, in one direction. (2) The formation of the marked lines 56 and 514 stretches the material in those marked lines and in this way extends the subelections Pll and P17 when the pressure seal takes place, for the best sealing and compensation of the bend radius. Advantage VI - economic use of cardboard to pack.

The following features are significant: (1) The configuration of the lower edge makes it possible to interlace the lower edges of the preforms, as shown in figures 7 and 14, and thus reduce the cuts. (2) The proper alignment of the lower sections folded to exactly the same position and configuration once brings back avoids having lower sections too large to ensure airtightness. (3) The proper alignment of the closure allows the use of simpler mechanisms to bend the lower sections. (4) The overlap of the lower sections may occur when adjusted sufficiently to ensure bending, control of the lower final closure configuration and gas tightness. Advantage VII - good stability of the carton.

The feature VI (4) is significant because it allows the lower end closure to be pressurized so that it is flat on its outside side.

Claims (12)

NOVELTY OF THE INVENTION CLAIMS

1. A preformed material in sheet to p > a container to be packed, comprising: a row of body sections (P1-P4) consisting of the first, second, third and fourth body sections (P1-P4), and a row of sections of final closure, substantially rectangular, (P6-P18) extending substantially parallel to said row of body sections (P1-P4) and consisting of the first, second, third and fourth final closure sections (P6-P18) ) of which each of the sections of final closing first (P7-P9) and third (P14-P16) have the oblique lines of weakness first and second (S3, S7, S13, S17) that divide their section into a subsection central (P8-P15) substantially of isosceles triangle and two extreme subsections (P7, P9, P14, P16) of substantially triangular shape, including each of said first closing sections (P7-P9? and third (P14-) P1B) a central handle (P10, P11, P17, P18) that projects centrally towards outside with respect to its section (P7-P9, P14-P16) and thus skirting the respective cavities (E4, E9, E19, E24) in the outermost area of the edge of its section (P7-P9, P14-P16), the second end closing section (P12) including a central handle (P13) projecting centrally outwards with respect to its section (P12) projecting the handles (P10, P11, P13, P17, P18) of the first closing sections , second and third (P7-P18) of the longitudinal center line of said row of body sections (P1-P4) subetancially to the same extent as both, and overlying in the fourth final closing section (PB) of said central line at least to the same extent as the handles (P10, P11, P13, P17, P18), further characterized in that said central handle (P13) of said final closing section (P12) borders the respective cavities (E12, E16) in the outermost area of the edge of its section (P12), those cavities also being bordered by s respective edges (E12, E16) of said second final closing section (E12) extending in the same general direction as said row of body sections (P1-P4), and perqué said lugs (P10, P11, P13- P17, P18) of the first, second and third final closing sections (P7-P18) and the edge area of said fourth final closing section (P6) which is furthest from said longitudinal centerline are dimensioned in such a way that the handles (P10, P11, P13, P17, P18) and such edge zones of a first row of preforms identical to said preform can be interlaced with the corresponding handles (P10, P11, P13, P17, P18) and the corresponding ones of those of the edges of a second row of preforms each identical to said prsform.

2. A preform of sheet material according to claim 1, further characterized in that said second final closing section (P12) includes outward projecting portions (Eli, E12, E16, E17) on the respective opposite sides of said central handle (P13) of said second final closing section (P12) to project beyond the adjacent adjacent free edges (E9, E19, E4, E24) of said first closing sections (P7 - P9) and third ( P14-P16), because said protruding outward portions (E11, E12, E16, E17) have the respective edges (E11, E17) that start substantially perpendicular to said central line of said row of body sections (P1- P4) and continue to said central handle (P13).

3. A preform of sheet material according to claim 2, further characterized in that said respective edges (E11, E17) of said protruding outward portions (E11, E12, E1B, E17) continue convexly curved toward said central handle (P13).

4. A preform of sheet material according to claim 1, 2 or 3, further characterized by the respective lines of weakness (S4), SB, S14, S16) extend over the entire widths of the roots of the central lugs (PÍO, Pll, P17, P1B) of the final closing sections first (P7-P9) and third (P14-P16).

5. A preform of sheet material from which a container for packaging has to be made, comprising: a row of body sections (P1-P4) constituted of the first, second, third and fourth body sections ( P1-P4), and a row of end closure sections, substantially rectangular (P6-P18) extending substantially parallel to said row of body sections (P1-P4) and constituted of the first end closure sections, second, third and fourth (P6-P18) of which each of the sections of final closing first (P7-P9) and third (P14-P16) has the oblique lines of weakness first and second (53,57,513,517) that divide the section in a central subsection (E8, E15) substantially of isosceles triangle and two extreme successions (P7, P9, P14, P16) of substantially triangular shape, including each of said first end closure sections (P7-P9) ) and third (P14-P16) a central handle (PÍO, Pll, P 17, P18) projecting centrally outward with respect to its section (P7-P9, P14 ~ P16) and thus skirting the respective cavities (E4, E9, E19, E24) in the outermost area of the succession border (P7- P9, P14-P16), including the second final closing section (P12) a central handle (P13) projecting centrally outward with respect to succession (P12), and the portions that overhang outwards (E11, E12, E18, E17) on the respective opposite sides of said central handle (P13) of said second closing closing section (P12) to project beyond the respective adjacent free edges (E9, E19, E4, E24) of said first closing sections. (P7-P9) and third (P14-P16), the handles protruding (P10, P11, P13, P17, P18) in the first, second and third final closing sections (P7-P18) of the longitudinal centerline of said row of body sections (P1-P4) substantially in the same station as both, and projecting fourth section d final closing (PB) of said central line at least to the same extent as the handles (P10, P11, P13, P17, P18), further characterized because said portions protruding outwards (E11, E12, E16, E17) they have the respective edges (E11, E17) which start substantially perpendicular to said central line of said row of body sections (P1-P4) and continue towards said central handle (P13).

6. A preform of sheet material according to claim 5, further characterized in that said respective edges "(E11, E17) of said protruding outward portions (E11, E12, E16, E17) continue to" convexly " curved towards said central handle (P13).

7. A container for packaging of sheet material, which includes: a succession of body portions (P1-P4) constituted of the first, second, third and fourth body portions (P1-P4), and? N final closure which includes the substantially rectangular inner and outer wall portions (P12-P6) that extend from the respective edges (Sil, SI) of the first and third body portions (P3, P1); P1, P3), the outer portion CP6) overlapping the inner portion (P12) of said inner portion (P12), also including the first and second groups of the substantially triangular wall portions (P7-P9, P14- P16), also including the first and second groups of the substantially triangular wall portions (P7-P9, P14-P16) the respective, substantially triangular, inner wall portions (P8, P15) that extend from the body portions second and fourth (P2, P4), respectively to the respective apices, Al, 02 adjacent to each other, and the respective pairs of outer, substantially triangular wall portions (P7, P9, P14, P1B) extending from the respective interior, substantially triangular wall portions (P8, P15), and from the substantially rectangular inner and outer wall portions (P12, P6), the first and second grab handles (P10, P11, P17, P18) extending from ma This sub-section is substantially parallel to each other starting from the respective pairs of external, substantially triangular wall portions (P7, P9, P14, P16) in the respective zones, apexes 01, A2 and each one folded on itself, the inner, substantially rectangular wall portion (P12) including a third handle (P13) which overlies centrally with respect to the remainder of that portion of p > ared (P12) and bent back face to face on said rest sandwiched between said remainder and said outer wall portion, substantially rectangular (P6), with the interposition of said first and second handholds (P10, P11, P17, P18) between said third seizes "Jera (P13) and said outer wall portion, substantially rectangular (P6), also including the inner, substantially rectangular wall portion (P12) the projecting portions (E11, E12, E16, E17) on the respective sides opposite said third handle (P13) and directed from said third handle (P13), further characterized in that said projecting portions (E11, E12, E16, E17) are interposed between said outer, substantially rectangular wall portion (PB), on the one hand, and the respective ones (P7, P16) of said outer wall portions, subetancialmente rectangular (P7, P9, P14, P16), on the other hand, and has the respective lateral edges (E11, E17) that begin immediately "Jyacentes and substantially parallel to the respective lines of Joblez between the portion of external wall, substantially rectangular (P6), on the other hand, and said respective (P7, P16) of said portions of external wall, substantially triangular (P7, P9, P14, P16), on the other hand, and continue towards said third handle (P13).

8. A container for packaging according to claim 7, further characterized in that the respective edges (E31, E32, E34, E35) of the substantially triangular wall portions (P7, P9, P14, P15) of each portion pair of external, substantially triangular walls are subetanially adjacent to each other.

9. A container for packaging according to claim 7 or 8, further characterized in that said respective side edges (E11, E17) continue to be convexly curved to said third handle (P13).

10. A container for packaging according to claim 7, 8 or 9, further characterized in that the respective lines of weakness (S4, S6, S14, S16) folded each on itself, extend over the full widths in the roots of the first and second handles (PÍO, Pll, P17, PIB).

11. A preform of sheet material from which a container for packaging has to be made, which incl: a row of body sections (P1-P4) made up of the sections "Je body first, second, third and fourth" (P1-P4), and a row of end closing sections, substantially rectangular (P6-P18) extending substantially parallel to said row "Je sections" Je body (P1-P4) and constituted of the closing sections final first, according to «Ja, third and fourth (P6-P18) of which each of the final closing sections first (P7-P9) and third (P14-P16) has oblique lines of first and second weakness (S3, S7, S13, S17) that divide their section into a central section (P8-P15) in a subetancial manner of an isosceles triangle and two final sub-sections (P7, P9, P14, P16) in an eubstantially triangular manner, including each of said final closing sections first (P7-P9) and third (P14-P16) a central handle (P10, P11, P17, P18) projecting centrally outwards with respect to its section (P7-P9, P14-P16) and thus skirting the respective cavities (E4, E9, E19, E24) in the outermost area of the edge of its section (P7-P9, P14-P16), "Jo outwards the second final closing section (P12), also characterized because the respective lines <The weakness (S4, S6, S14, S16) extend over the full widths of the central lae claraceae root (P10, P11, P17, P18).

12. A container for packing of material in sheet, which includes: a succession of portions "Je body (Pl-P4) consisting of the portions of first, second, third and fourth body (P1-P4), and a final closure which includes the substantially rectangular inner and outer wall portions (P12, P6) that extend from the respective edges (Sil, SI) of the first and third body portions (P3, P1; P1, P3) overlapping the outer portion (P6) the inner portion (P12) externally of said inner portion (P12), also including the first and second groups of the substantially triangular wall portions (P7-P9, P14-P16), comprising the first and second groups of the substantially triangular wall portions (P7-P9, P14 ~ PIB) the respective, substantially triangular, inner wall portions (P8, P15) extending from the second and fourth body portions (P2, P4), respectively , in the respective apices Al, A2 adjacent to each other and the respective pairs of substantially triangular, outer wall portions (P7, P9, P14, P16) extending from the respective substantially triangular interior wall portions (P8, P159, and from the inner and outer wall portions, subetanially rectangular (P12, P6), the first and second lugs (P10, P11, P17, P18) extending substantially parallel to one another from the respective pairs of outer wall portions , sub-triangularly triangular (P7, P9, P14, P16) in the areas of said respective apices and each folded on itself, including the substantially rectangular inner wall portion (P12) a third handle (P13) bent backwards facing face on the remainder of that portion of wall (P12) sandwiched between said remainder and said portion "Je exterior wall, substantially rectangular (PB), with the interposition of said first handholds and second (P10, P11, P17, P18) between said third grip "Jera (P13) and said portion of outer wall, substantially rectangular (P6), further characterized because the respective lines" Je weakness (S4, S6, S14, S1B ), each folded on itself, extend over the full widths of the roots of the first and second handholds (P10, P11, P17, P18). SUMMARY OF THE INVENTION A lower end closure of a cardboard package to be heat sealed and pressurized has four substantially rectangular sections of which the sections are divided by the lines marked in the interior, triangular reactions and the exterior triangular subsections and have formed central grips. in pairs "Je small, rectangular subsections that provide gas tightness at the apices Al and A2 in the sealed closure; the marked lines provide lines of weakness through the full widths of the roots of the central handles, so that the handles, when the object is folded over itself, can be adjusted to the orientation of a folded section. outward during the fold of the inward part of the handles, which are interspersed between the sections; in the preform, the lugs and the sections are divided so that they can be interlaced with the corresponding lugs and sections of the lower parts of a row of identical preforms; the edge portions of the projecting parts of the section begin at and parallel to the vertical edges of the section and continue to be convexly curved toward the section, to operate in conjunction with the sections between the section, on the other hand, and the sections. subsections, on the other hand, to improve the production and maintenance of the closure's own alignment. 6C / amm * elt * apm * lprn * lse P97 / 847F