Plastic bag

Abstract

This utility model relates to packaging, specifically bags made of flexible sheet material for the placement, storage, transportation, and shipping of goods, primarily individual, textile, soft, or partially compressible goods. The technical result consists of reducing the overall rectangular size of the filled bag, as determined by the outermost points of the outer contour, while maintaining the product placement area. It also reduces the risk of snagging, bending, and damage to free corner areas during transportation and warehouse handling.The technical result is achieved in a package made from a flexible sheet material and containing walls connected to each other along the periphery to form an internal cavity, as well as a means for closing the package, wherein the package in a flat laid out state has a rectangular contour of width W and height H, formed by straight lines passing along the width and height of the package, wherein four corner sections of the package are made beveled, wherein each beveled corner section connects points of adjacent sides of the rectangular contour, located from the corresponding vertex of the said rectangular contour at distances λ1W and λ2H, where λ1 and λ2 are from 0.03 to 0.20. 7 c.p. phyl., 5 fig.

Description

[0001] This utility model relates to packaging, specifically to bags made of flexible sheet material for the placement, storage, transportation, and shipment of goods, primarily individual, textile, soft, or partially compressible goods. The utility model can be used in the manufacture of packaging bags with reclosable closures, including zip-locks or adhesive flaps, as well as in other consumer, transport, and warehouse packaging for which the dimensions of the filled bag, determined by the outermost points of the outer contour, are essential.

[0002] Flexible rectangular packaging bags are known. They are made of polymer film and contain two walls joined together along the periphery to form an internal cavity for product placement. These bags may have a closure in the form of an adhesive flap, a zip fastener, a profile lock, or other reclosable element. A disadvantage of conventional rectangular bags is that when bulky products are placed, the central portion of the bag expands, while the free corner areas remain as protruding zones. When measuring the filled bag at the outermost points of the outer contour, these protruding free corner areas can increase the overall rectangular size of the filled bag, although they do not actually contribute to the product placement.

[0003] RU2013130652A / RU2669741C1, a package with curved rounded corners. This family of solutions discloses a flexible package made of film material, in which the fastening area forms the corner portion of the container, including a curved fastening and rounded corners. Common features with the claimed utility model include the packaging being made of flexible sheet material, the presence of walls, peripheral joints, and modified corner sections. This prior art solution is primarily aimed at reducing the risk of damage or puncturing of the package corners. This prior art solution does not disclose the relationship between the corner shape and the reduction in the overall rectangular shape of the filled package while maintaining the product placement area. A disadvantage of this solution, as applied to the problem under consideration, is the lack of parametric binding of the corner section to the maximum width and maximum height of the package.

[0004] WO2019084745A1. A folded flexible pouch is known, which can be flat when empty, but when filled, gains volume due to the side folds. The common features of the pouch include a flexible design, walls, peripheral joints, and internal cavities for product storage. This known solution is aimed at increasing the strength and stability of the folded corner areas when dropped or under load, rather than reducing the protruding free corner areas in a flat pouch.

[0005] WO2016085522A1. This solution discloses a stick pack in which corner sections and seams can have rounded geometry to improve product flow and reduce product retention in the corners. Common features include flexible packaging, walls, joints, and modified corners. This prior art solution does not address the problem of reducing the overall rectangular shape of the filled package by removing free corner areas.

[0006] The closest analog chosen as the prototype is CN103298703B, as it discloses flexible packaging with modified corner geometry, in which adjacent edges form an obtuse angle. A drawback of this prototype is the lack of a structural connection between the corner section and the conventional rectangular contour formed by lines running along the maximum width and maximum height of the package, as well as the absence of the λ₁W and λ₂H parameters and the product placement area in the form of the largest inscribed rectangle. As a result, the prototype does not address the problem of reducing protruding free corner sections of a filled package while maintaining the product placement area.

[0007] As a context for application, it should be noted that in warehouse and marketplace logistics, the volumetric weight characteristics of goods are typically determined based on the product in its packaging, and measurements can be performed by automated devices. Specifically, Ozon's open reference materials link volumetric weight characteristics to the weight and dimensions of the product in its packaging (https: / / seller-edu.ozon.ru / work-with-goods / trebovaniya-k-kartochkam-tovarov / product-information / ovh), while Wildberries' materials specify that the product in its packaging is measured at its outermost points, taking into account protruding parts (https: / / seller.wildberries.ru / instructions / ru / ru / material / item-dimensions-measuring). This information does not constitute features of the claimed utility model, but it does confirm the practical significance of the task of reducing protruding parts of the packaging.

[0008] The technical problem solved by the utility model consists of creating a package made of flexible sheet material that reduces protruding free corner areas after placing goods within the internal cavity without reducing the central area of ​​the package suitable for product placement. The technical result consists of reducing the overall rectangular shape of the filled package, defined by the outermost points of the outer contour, while maintaining the product placement area, as well as reducing the risk of snagging, bending, and damage to free corner areas during transportation and warehouse handling.

[0009] The technical result is achieved in a package made of a flexible sheet material and comprising walls interconnected along the periphery to form an internal cavity, as well as a means for closing the package. When laid flat, the package has a notional rectangular contour of width W and height H, formed by straight lines passing along the maximum width and maximum height of the package. At least two corner sections of the package are beveled. Each beveled corner section connects points of adjacent sides of the notional rectangular contour, located from the corresponding vertex of said notional rectangular contour at distances λ1W and λ2H, where λ1 and λ2 range from 0.03 to 0.20.

[0010] In this specific embodiment, four corner sections of the bag are beveled. Each beveled corner section can be designed as a straight section of the peripheral wall joint or as a curved section of the peripheral wall joint. The closure can be a zip fastener or an adhesive flap. The flexible sheet material can be a polymer film. The beveled corner sections can be located outside the product placement area, which is the largest inscribed rectangle whose sides are parallel to the sides of the conventional rectangular contour. The coefficients λ1 and λ2 can be selected to ensure a ratio of 0.33 ≤ λ1 / λ2 ≤ 3.

[0011] In this description, the conventional rectangular contour 7 is understood to be a rectangle formed by two pairs of mutually perpendicular lines passing along the maximum width W and maximum height H of package 1 in the flat-laid state. This contour 7 does not constitute an additional external gap outside package 1, but rather represents geometric lines passing through the outermost sections of package 1 in width and height. In the figures, contour 7 is shown as a dotted line coinciding with the lines of maximum width and maximum height of package 1.

[0012] The product placement zone 9 is understood to be the largest inscribed rectangle that can be constructed within the internal working area of ​​the package 1 so that its sides are parallel to the sides of the conventional rectangular contour 7. The specified zone 9 characterizes the part of the internal cavity 5 intended for placing the product without the product entering the zones of the beveled corner sections 8 and the peripheral connection of the walls 4.

[0013] Brief description of the drawings

[0014] Fig. 1 - general view of the package 1 with a zip fastener in a flat laid out state, which shows the internal cavity 5, the closing means 6, the conventional rectangular contour 7, the beveled corner sections 8, as well as the dimensions W, H and the distances λ1W and λ2H.

[0015] Fig. 2 - an enlarged fragment of a rectilinear beveled corner section 8 connecting the points of adjacent sides of a conditional rectangular contour 7, located from the corresponding vertex at distances λ1W and λ2H, with an indication of the ratio 0.33≤λ1 / λ2≤ 3.

[0016] Fig. 3 - general view of package 1, which shows the zone 9 for placing goods in the form of the largest inscribed rectangle, the sides of which are parallel to the sides of the conditional rectangular contour 7, with the beveled corner sections 8 located outside the specified zone 9 for placing goods.

[0017] Fig. 4 - an embodiment of a package 1, in which the closing means 6 is made in the form of an adhesive valve, wherein the package 1 contains a peripheral connection of walls 4, a conventional rectangular contour 7 and beveled corner sections 8.

[0018] Fig. 5 - enlarged fragment of a curved beveled corner section 8 connecting the points of adjacent sides of a conditional rectangular contour 7, located from the corresponding vertex at distances λ1W and λ2H.

[0019] Package 1 is made of a flexible sheet material, such as polymer film, laminated film, polyethylene, polypropylene, polyethylene terephthalate, or a combination of these. The material may be transparent, translucent, opaque, colored, antistatic, or biodegradable. The thickness of the material is selected based on the weight and shape of the packaged goods, seam strength requirements, and the closure method. In the most common embodiment, package 1 comprises first and second walls superimposed on each other and joined together along the periphery to form an internal cavity 5. The peripheral connection of walls 4 can be achieved by heat sealing, ultrasonic welding, adhesive bonding, welding with pre-cut corners, or another method suitable for joining flexible sheet material.

[0020] The closing means 6 is intended for closing the internal cavity 5 after the goods have been placed. In the embodiment shown in Fig. 1, the closing means 6 is implemented in the form of a zip fastener, which may include interacting profile elements, a slider, or a section for manual opening and closing. In the embodiment shown in Fig. 4, the closing means 6 is implemented in the form of an adhesive flap, which may contain a folding adhesive strip, a protective removable tape, and a flap fold line. The specified embodiments of the closing means 6 are alternative and do not change the general principle of the utility model, since the technical result is achieved primarily due to the geometry of the beveled corner sections 8 relative to the conventional rectangular contour 7.

[0021] When laid out flat, package 1 has a conditional rectangular contour 7 of width W and height H. Conditional rectangular contour 7 is formed by straight lines passing along the maximum width and maximum height of package 1. When practically determining the specified parameters, package 1 is placed on a flat surface without stretching the material, after which the maximum distance between the left and right outer sections of package 1 and the maximum distance between the upper and lower outer sections of package 1 are determined. These distances are taken as W and H, respectively. The dotted line of contour 7 in the figures does not mean the presence of a structural element protruding beyond package 1, but serves to designate geometric straight lines passing along the maximum width and maximum height of package 1.

[0022] Each beveled corner section 8 connects the points of adjacent sides of the conventional rectangular contour 7. If we consider, for example, the upper left corner of package 1, the first point is located on the upper side of the conventional rectangular contour 7 at a distance of λ1W from the corresponding vertex, and the second point is located on the left side of the conventional rectangular contour 7 at a distance of λ2H from the same vertex. The connection of these points forms a beveled corner section 8. The upper right, lower left, and lower right corner sections can be realized in a similar manner. The variant with four beveled corner sections 8 is preferable for symmetrically reducing the free corner zones of package 1; however, at least two beveled corner sections 8 also ensure a reduction in the protruding zones in the corresponding corners.

[0023] Coefficients λ1 and λ2 are dimensionless coefficients linking the dimensions of the beveled corner section 8 to the overall dimensions of package 1 when laid out flat. Using these coefficients allows for scaling the geometry of the beveled corner sections 8 for packages of different sizes. If the bevel dimensions are specified only in millimeters, the same absolute bevel may be excessive for a small package and insufficient for a large package. In the proposed solution, distances λ1W and λ2H vary proportionally to the width W and height H of the conventional rectangular contour 7, thereby preserving the design concept of reducing the free corner sections for different sizes of package 1.

[0024] The range of λ1 and λ2, from 0.03 to 0.20, was selected taking into account the need to remove a significant portion of the free corner zone without unacceptably reducing the product placement zone 9. When λ1 and λ2 are less than 0.03, the beveled corner section 8 becomes too small and removes only a small portion of the corner zone, as a result of which pronounced protruding corner sections may remain after bag 1 is filled. When λ1 and λ2 are greater than 0.20, the bevel may approach the product placement zone 9 excessively, reducing the internal cavity 5, reducing the strength of the peripheral connection of walls 4 in the corner area, and impairing the ease of closing bag 1.

[0025] The ratio of 0.33≤λ1 / λ2≤3 was selected to maintain the functional geometry of the beveled corner section 8 for different aspect ratios of the package 1 and for different embodiments of such a section. The lower limit of 0.33 allows for the production of a beveled corner section 8 whose horizontal dimension is approximately three times smaller than its vertical dimension. This is acceptable for elongated packages and especially for the curved beveled corner section 8, since the smooth curvilinear shape ensures a gradual conjugation of the adjacent sides of the conventional rectangular contour 7, and such a difference has virtually no detrimental effect on the appearance, the strength of the peripheral connection of the walls 4, or the ability to reduce the free corner section.The upper limit 3 allows for the reverse situation, in which the size of the beveled corner section 8 in the horizontal direction is approximately three times greater than its size in the vertical direction; this option may be appropriate for wide packages, as well as for the upper corner sections when the closing means 6 is implemented along a curved trajectory from one side wall to the other. When the ratio λ1 / λ2 is less than 0.33 or greater than 3, the beveled corner section 8 becomes excessively elongated along one side of the conventional rectangular contour 7 and effectively turns into a nearly one-sided undercut, as a result of which a protruding free corner section of the filled package 1 may remain in the other direction, or the ease of inserting the goods through the inlet may be impaired.In the specified range, while maintaining individual values ​​of λ1 and λ2 from 0.03 to 0.20, the removal of the free corner zone in two adjacent directions is ensured without an unacceptable reduction in the zone 9 for placing goods.

[0026] Product placement zone 9 is the largest inscribed rectangle whose sides are parallel to the sides of the conventional rectangular outline 7. This definition allows for the objective establishment of the boundaries of zone 9 in a real product. To do this, bag 1 is laid out on a flat surface, the internal boundaries of the peripheral wall joint 4, the internal boundary of the closure 6, and the beveled corner sections 8 are determined, and then the largest rectangle is constructed within the available work area, the sides of which are parallel to the sides of the conventional rectangular outline 7. The location of the beveled corner sections 8 outside product placement zone 9 means that the bevels primarily remove those parts of bag 1 that are not involved in the placement of a product of a given size, but in a conventional rectangular bag they form free corner projections.

[0027] The relationship between the features and the technical result is as follows. When a bulky product is placed in the internal cavity 5 of a flexible bag 1, the central portion of bag 1 is deformed and acquires a volume corresponding to the shape of the product. The corner areas not occupied by the product in a conventional rectangular bag remain free and protrude beyond the main bulk. In the claimed bag 1, these free areas are reduced by the inclusion of beveled corner sections 8. Since the position of each beveled corner section 8 is determined relative to the maximum width W and maximum height H of bag 1, the removal of the free corner area is consistent with the standard size of bag 1. As a result, the filled bag 1 has a smaller overall rectangular shape at the extreme points of the outer contour while maintaining the product placement area 9.

[0028] As a geometric explanation, one corner section of a conventional rectangular contour 7 can be considered. If the distance from the vertex to the first bevel point in the horizontal direction is equal to a, and the distance from the same vertex to the second bevel point in the vertical direction is equal to b, then for the claimed solution a=λ1W, b=λ2H. With a rectilinear execution of the beveled corner section 8, the removed corner zone in a flat state can be approximately considered as a right triangle with an area of ​​a×b / 2. When four identical beveled sections are executed, the total removed area of ​​the free corner zones is approximately 2ab. This geometric relationship shows that an increase in λ1 and λ2 within the declared range leads to a decrease in the area of ​​the free corner zones, but at the same time, the location of the beveled corner sections 8 outside the zone 9 for placing the goods allows preserving the useful area for the goods.

[0029] In one embodiment, bag 1 is intended for packaging a textile product, such as a T-shirt or a soft accessory. Bag 1 is made of transparent polymer film and has a zip fastener 6 as a closure means and four straight, beveled corner sections 8. With a width W of 300 mm and a height H of 400 mm, the coefficients λ1 and λ2 can be, for example, 0.08. In this case, the distances from the apex of the conventional rectangular contour 7 to the ends of the beveled corner section 8 are 24 mm in width and 32 mm in height, respectively. Such bevels remove corner sections not occupied by the product and reduce the likelihood of protruding, loose "ears" forming after bag 1 is filled.

[0030] In another embodiment, bag 1 has a closure means 6 in the form of an adhesive flap. A flexible sheet material forms the front and rear walls, joined along the periphery to form an internal cavity 5. The upper portion of bag 1 comprises a flap with an adhesive strip and a protective tape. Beveled corner sections 8 are provided at least in the lower corners and may additionally be provided in the upper corners. This design is suitable for shipping bags in which the goods are closed with the flap after placement and transported in flexible packaging. Beveled corner sections 8 reduce free protruding areas, and the flap ensures closure of the internal cavity 5.

[0031] The embodiment shown in Fig. 5 provides for a curved, beveled corner section 8. In this case, the beveled corner section 8 also connects the points of adjacent sides of the conventional rectangular contour 7, located at distances λ1W and λ2H from the corresponding vertex. The curvilinear shape can be used to reduce stress concentration in the corner region, improve welding processability, or improve the appearance of the package 1. Moreover, the curvilinear design maintains the same principle of placement of the ends of the beveled corner section 8 and therefore ensures the same technical result.

[0032] Package 1 can be manufactured from a roll of material by feeding the web, forming two walls, installing or forming a closure 6, peripherally joining the walls 4, and punching or welding the corner sections along a predetermined path. Beveled corner sections 8 can be formed by cutting the blank before welding, punching after welding, welding along a beveled contour and then removing excess material, or simultaneous welding and cutting. The manufacturing technology is selected such that the beveled corner sections 8 of the first and second walls coincide, and the peripheral connection of the walls 4 ensures strength and tightness sufficient for the intended use of package 1.

[0033] To verify the achievement of the technical result, bag 1 can be compared to a standard rectangular bag of the same size and product placement area 9. The same product or product imitation is placed in a standard rectangular bag and in bag 1 with beveled corner sections 8. After this, the filled bag's overall rectangular dimension is determined using the outermost points of the outer contour. Given the same product placement area 9 and the same thickness of the placed product, bag 1 with beveled corner sections 8 should exhibit a reduction in protruding free corner sections and a reduction in the measured overall rectangular dimension of the filled bag.

[0034] In this practical example, a 450x350 mm zip-lock bag was used. The product used was a terry cloth couch cover. In its initial state, when using a standard rectangular bag without beveled corners (8), the dimensions of the filled bag at the outermost points of the outer contour were 420x345x110 mm. The calculated volume of a parallelepiped inscribed within the outermost points of such a filled bag was 15.94 liters.

[0035] When creating beveled corner sections 8 with a distance from the apex of the conventional rectangular contour 7 to the bevel point of 20 mm in width and 30 mm in height at each corner, the dimensions of the filled package were 400 × 320 × 110 mm, and the calculated volume of the parallelepiped inscribed at the extreme points was 14.08 liters. The decrease in the calculated volume compared to the original rectangular package was approximately 11.7%. Moreover, the product was placed in the internal cavity 5 and removed from it without a noticeable deterioration in usability compared to a conventional package.

[0036] When the bevels were increased to 27 mm in width and 40 mm in height at each corner, the dimensions of the filled bag were 390 x 310 x 110 mm, and the calculated volume of the parallelepiped inscribed at the extreme points was 13.30 liters. The calculated volume decreased by approximately 16.6% compared to the original rectangular bag. However, with this bevel size, product placement became significantly more difficult due to the reduced width of the inlet. This example demonstrates that increasing λ1 and λ2 enhances the effect of reducing the overall rectangular dimension of the filled bag, but as it approaches the upper limit of the stated range, it must be consistent with the design of closure 6 and the shape of the inlet.

[0037] For bags 1 with increased bevels, especially in the upper corner sections, the closing means 6 can be designed not only along a straight section between the ends of the upper beveled sections 8, but also along a curved path from one side wall to the other. This design increases the effective length and width of the inlet, reduces the formation of a rigid sharp bend in the flexible sheet material during filling, and can improve the durability of the bag 1 in the closing area. Therefore, the curved beveled corner section 8 in Fig. 5 is preferable in embodiments where it is necessary to maintain the ease of inserting goods at relatively large distances λ1W and λ2H.

[0038] Package 1 can be manufactured from a roll of material by feeding the web, forming two walls of the installation or forming a closing means 6, performing a peripheral connection of the walls 4, and punching or welding the corner sections along a predetermined path. Beveled corner sections 8 can be formed by cutting the blank before welding, punching after welding, welding along a beveled contour and then removing excess material, or simultaneous welding and cutting. The manufacturing technology is selected such that the beveled corner sections 8 of the first and second walls coincide, and the peripheral connection of the walls 4 ensures strength and tightness sufficient for the intended use of package 1.

Claims

1. A package made from a flexible sheet material and containing walls connected to each other along the periphery to form an internal cavity, as well as a means for closing the package, wherein the package in a flat state has a rectangular contour of width W and height H, formed by straight lines running along the width and height of the package, characterized in that the four corner sections of the package are made beveled, and each beveled corner section connects the points of adjacent sides of the rectangular contour, located from the corresponding vertex of the said rectangular contour at distances W and H, where And range from 0.03 to 0.

20.

2. A package according to item 1, characterized in that each beveled corner section is made in the form of a straight section of the peripheral connection of the walls.

3. A package according to item 1, characterized in that each beveled corner section is made in the form of a curved section of the peripheral connection of the walls.

4. A package according to paragraph 1, characterized in that the closing means is made in the form of a zip fastener.

5. A package according to paragraph 1, characterized in that the closing means is made in the form of an adhesive valve.

6. A package according to paragraph 1, characterized in that the flexible sheet material is a polymer film.

7. A package according to paragraph 1, characterized in that the beveled corner sections are located outside the product placement area, which is the largest inscribed rectangle, the sides of which are parallel to the sides of the rectangular outline.

8. The package according to paragraph 1, characterized in that the coefficients And selected to ensure a ratio of 0.33 ≤ / ≤ 3.

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