Reclosable paper packaging

Abstract

A bag includes a first panel having a pair of first panel lateral edges and a first panel interior-facing surface, a closure opposite the bottom, wherein the closure releasably connects the first panel to a second panel. The closure includes a first flexible corner. The first flexible corner includes a first interior portion interiorly joined to the first panel and a first exterior portion extending from the first interior portion and located exteriorly of the interior volume. The closure includes a repositionable pressure sensitive adhesive releasably joining the first exterior portion to a second panel interior-facing surface. A free flange extends from the first exterior portion. The free flange is free of the repositionable pressure sensitive adhesive. The first panel and the second panel have greater than about 80 percent by weight paper.

Description

Technical Field

[0001] Resealable paper packaging Background Technology

[0002] Consumers expect resealable, recyclable packaging. Rigid recyclable packaging made of cardboard, corrugated cardboard, glass, and plastic can meet this demand. For certain types of products, rigid packaging may not be desired for a variety of reasons.

[0003] Many products are packaged in flexible plastic film bags. Flexible plastic film bags can be lightweight, durable, and inexpensive. These bags may be equipped with mechanisms to reseal the bag after the initial opening. For example, bags for dried food are often resealable with cable ties. Some products, including soluble unit-dose laundry detergents and dishwashing products, are sold in flexible plastic film bags that include interlocking closures. Common interlocking closure mechanisms include sliding seals, where the sliding mechanism includes a plow-shaped component that pushes open a tongue-and-groove connector when opened and a guide that re-closes the connector. Pressure-sealing interlocking closure mechanisms that can be opened and closed directly by the user's fingers, such as VELCRO, tongue-and-groove connectors, and interlocking knobs, are also common. Similar to flexible plastic film bags, the closure mechanism is often made of a plastic material because plastic materials possess the necessary combination of flexibility to allow the interlocking mechanism to interlock and rigidity to resist accidental opening.

[0004] Some consumers may not have easy access to storage points in the plastic film bag recycling stream. Given this limitation, there remains an unresolved need for resealable bags that consumers can easily store in the recycling stream. Summary of the Invention

[0005] A bag includes: a first side panel having a pair of first side panel lateral edges and an inward-facing surface; a second side panel opposite the first side panel and having an inward-facing surface facing the inward-facing surface of the first side panel, wherein the second side panel is connected to the first side panel across the bottom of the bag and has a pair of second side panel lateral edges, wherein each of the first side panel lateral edges engages with an opposing second side panel lateral edge; and a closure opposite the bottom and extending along a longitudinal axis, wherein the closure detachably connects the first side panel and the second side panel, wherein the closure, a portion of the inward-facing surface of the first side panel, and a portion of the inward-facing surface of the second side panel are connected. The bottom defines an internal volume; wherein the closure includes: a first flexible corner member extending along the longitudinal axis, wherein the first flexible corner member includes a first internal portion joined to the first side sheet within the internal volume and a first external portion extending from the first internal portion and located outside the internal volume; a repositionable pressure-sensitive adhesive that peelably bonds the first external portion directly or indirectly to the inward-facing surface of the second side sheet; a free flange extending from the first external portion and along at least a portion of the longitudinal axis, wherein the free flange does not have the repositionable pressure-sensitive adhesive; wherein the first side sheet and the second side sheet have more than about 80% by weight of paper. Optionally, the bag further includes a second flexible corner piece extending along the longitudinal axis, wherein the second flexible corner piece includes a second outer portion joined to the inward-facing surface of the second side piece outside the inner volume and a second inner portion extending from the second outer portion and located inside the inner volume, wherein the repositionable pressure-sensitive adhesive peelably joins the first outer portion to the second inner portion to peelably and indirectly join the first outer portion to the inward-facing surface of the second side piece through the second inner portion, and wherein the second inner portion has a second inner portion distal end oriented toward the inner volume. Attached Figure Description

[0006] Figure 1 This is a perspective view of the bag.

[0007] Figure 2 This is a perspective view of the cross-section of the top part of the bag.

[0008] Figure 3 This is a perspective view of the cross-section of the top part of the bag.

[0009] Figure 4 It is the cross-section of the bag containing the product in an inverted position.

[0010] Figure 5This is a perspective view of a bag with removable tear strips.

[0011] Figure 6 It is a cross-section of a portion of the bag, where the adhesive is located on the backing layer that is bonded to the second inner portion.

[0012] Figure 7 It is a cross-section of a portion of the bag, with some adhesives located on the backing layer bonded to the second inner portion and some adhesives located on the backing layer bonded to the first outer portion.

[0013] Figure 8 It is a cross-section of a part of the bag.

[0014] Figure 9 This is a side view of the first side panel, wherein the inward-facing surface of the first side panel is oriented toward the observer, and shows the first flexible flange, the peeling area, and the repositionable pressure-sensitive adhesive. Detailed Implementation

[0015] The term "joined to" encompasses configurations in which an element is directly fixed to another element by attaching it directly to another element; configurations in which an element is indirectly fixed to another element by attaching it to an intermediate member and then to another element; and configurations in which one element is integral with another element, i.e., one element is a fundamental part of the other element. The term "joined to" also encompasses configurations in which an element is fixed to another element at a selected location, and configurations in which an element is completely fixed to another element across the entire surface of one of the elements. The term "joined to" includes any known manner in which an element can be fixed.

[0016] Many consumers have easy access to recycling streams for paper products. Therefore, paper packaging can be conveniently stored in these streams by consumers. Many consumers consider bags to be the preferred packaging for consumer goods. Bags offer many advantages over rigid packaging, including but not limited to being lightweight, durable, and inexpensive. In particular, paper bags offer an opportunity to meet an unmet consumer need: the ability to store paper bags in paper recycling streams.

[0017] For many products packaged in bags, consumers and manufacturers desire closure mechanisms that allow for easy opening and secure sealing. This is especially true for bags that hold multiple disposable products, where consumers occasionally remove the disposable items for use, and the remaining disposable items are stored in the bag for future use.

[0018] Bag 10 is shown Figure 1The bag 10 may include a first side panel 20, a second side panel 30, and a closure 40. The second side panel 30 may be connected to the first side panel 20 across the bottom 60 of the bag 10. The first side panel 20 and the second side panel 30 may be separate pieces joined to each other at the bottom 60 of the bag 10. Optionally, the first side panel 20 and the second side panel 30 may be continuous. For example, the first side panel 20 and the second side panel 30 may be formed from a single base folded at the bottom 60. A portion of the first side panel 20, a portion of the second side panel 30, and the closure 40 together may define an internal volume 50. The internal volume 50 may accommodate a plurality of articles 2. The first side panel 20 may be connected to the second side panel 30 across the bottom 60 of the bag 10.

[0019] The first side panel 20 may have a pair of first side panel lateral edges 70 and a first side panel inward-facing surface 80. The second side panel 30 may be opposite the first side panel 20 and may have a second side panel inward-facing surface 90 facing the first side panel inward-facing surface 80. The second side panel 30 may have a pair of second side panel lateral edges 100. Each of the first side panel lateral edges 70 may be engaged with the opposite second side panel lateral edge 100.

[0020] The first side piece 20 may have a first side piece outer surface 82 opposite to the first side piece inner surface 80. Similarly, the second side piece may have a second side piece outer surface 92 opposite to the second side piece inner surface 90.

[0021] The bottom 60 of the bag 10 can be constructed in various ways. For example, the bottom 60 can be formed by joining the first side panel 20 and the second side panel 30 at the bottom. The first side panel 20 and the second side panel 30 can be formed from a single continuous base folded twice at the bottom 60 to form the flat bottom 60 of the bag 10. A gusset and a seal can be used in one or both of the first side panel 20 and the second side panel 30 to provide the desired shape of the bottom 60 of the bag 10. Furthermore, a gusset and a seal can be used at the lateral edges of the first side panel 20 and the second side panel 30 near the bottom 60 to provide the desired shape of the bottom 60 of the bag 10. Similarly, a gusset and a seal can be used at other locations along the lateral edges of the first side panel 20 and the second side panel 30 to provide the desired shape of the lateral edges of the bag 10 when it is filled.

[0022] Closure 40 may be opposite to bottom 60 and extend along longitudinal axis L. Longitudinal axis L may extend from a first side panel lateral edge 70 and a second side panel lateral edge 100 to opposite first side panel lateral edges 70 and 100. Closure 40 may detachably connect first side panel 20 and second side panel 30. Closure 40 may include a first flexible corner member 120 extending along longitudinal axis L. Figure 2The first flexible angle member 120 may include a first inner portion 130 engaged to the first side panel 20 within the inner volume 50. The first flexible angle member 120 may include a first inner portion 130 engaged to the inward-facing surface 80 of the first side panel. The first flexible angle member 120 may include a first outer portion 140 extending from the first inner portion 130 and located outside the inner volume 50. The position of the first flexible angle member 120 extending from the first inner portion 130 about the first outer portion 140 may be flexible. The first outer portion 140 may pivot about the position of the first outer portion 140 extending from the first inner portion 130. The first inner portion 130 is the portion of the first flexible angle member 120 engaged to the inward-facing surface 80 of the first side panel. The first outer portion 140 is referred to as the outer portion because it is located outside the inner volume 50, and the contents of the bag 10 may not contact the first outer portion 140 when the closure 40 of the bag 10 is closed.

[0023] The closure 40 may include a repositionable pressure-sensitive adhesive 150 that peelably bonds the first outer portion 140 to the inward-facing surface 90 of the second side panel. In this arrangement, the internal volume 50 of the bag 10 is isolated from the external environment, and the bag can be opened by separating the first outer portion 140 from the inward-facing surface 90 of the second side panel (e.g., by peeling). Figure 2 In the arrangement shown, the internal volume 50 is defined by a portion of the first side panel 20, a portion of the second side panel 30, and a first internal portion 130. The first internal portion 130 is referred to as the interior because it defines a portion of the internal volume 50, and the contents of the bag 10 are accessible to the first internal portion 130 when the bag 10 is not opened. A repositionable pressure-sensitive adhesive 150 can be peelably bonded to one of the inward-facing surface 90 of the second side panel and the first external portion 140. Optionally, the adhesive 150 can be applied to both the inward-facing surface 90 of the second side panel and the first external portion 140 oriented toward the inward-facing surface 90 of the second side panel.

[0024] The closure 40 may also include a free flange 160 extending at least a portion or entirely along the longitudinal axis L from the first outer portion 140. The free flange 160 may be without a repositionable pressure-sensitive adhesive 150. Arranged in such a way that the free flange 160 provides a longitudinally extending flange that a user of the bag 10 can clamp against the inward-facing surface 80 of the first side panel with the thumb and forefinger of one hand to peel the first outer portion 140 and the second side panel 30 apart by grasping the second side panel 30 with the other hand. Optionally, the free flange can be peeled from the second side panel by pulling the free flange 160 or the second side panel 30, or both, away from the other, thereby peeling the free flange 160 and the second side panel 30 apart. The first side panel 20 may include a base thicker than the free flange 160, making the first side panel 20 more rigid than the free flange 160. This arrangement provides a more robust surface against which the free flange 160 is clamped, and the user's opposing fingers grip the first side panel 20 upwards. A repositionable pressure-sensitive adhesive 150 resists separation of the first outer portion 140 from the second side panel 30, causing the bag 10 to tend to remain closed unless force is deliberately applied to open it. The free flange 160 can be a flexible and / or smooth material that is difficult for a user to grip firmly with their thumb and forefinger. This reduces the likelihood of opening the bag 10 simply by grasping the free flange 160 and peeling the first outer portion 140 from the inward-facing surface 90 of the second side panel. The free flange 160 can be coated with a smooth coating so that it cannot be easily grasped or clamped against the inward-facing surface 80 of the first side panel.

[0025] The free flange 160, the first outer portion 140, and the first inner portion 130 can be a continuous substrate. That is, the free flange 160, the first outer portion 140, and the first inner portion 130 can be formed from a monolithic substrate. The portion of the substrate that is bonded to the first side piece 20 can be the first inner portion 130. The portion of the substrate extending from the first inner portion 130 that is bonded to the repositionable pressure-sensitive adhesive 150 can be the first outer portion 140. The free flange 160 can pivot back and forth about the position where the free flange 160 extends from the first outer portion 140.

[0026] The free flange 160 may be recessed relative to the top edge 11 of the first side panel 20 and the second side panel 30. The top edge 11 is opposite to the bottom 60. This may require the user of the bag 10 to locate the free flange 160 more carefully so that the bag 10 can be opened. The bag 10 is opened by grasping the free flange 160 in a certain way with one hand and applying a peeling force to the first outer portion 140, thereby peeling the first outer portion 140 from the repositionable pressure-sensitive adhesive 150 bonded to the second panel 30 (which can be held with the other hand). Optionally, the repositionable pressure-sensitive adhesive 150 may be bonded to the first outer portion 140, and the first outer portion 140 and the repositionable pressure-sensitive adhesive 150 may be peeled from the second panel 30 (which can be held with the other hand) with one hand. The repositionable pressure-sensitive adhesive 150 may be located on a surface selected from the second panel 30, the first outer portion 140, and combinations thereof.

[0027] The repositionable pressure-sensitive adhesive 150 may include a backing layer and an adhesive composition. The adhesive composition may be carried on the backing layer. The backing layer may be bonded to a first outer portion 140. In such an arrangement, the adhesive composition may be peelably bonded to a second side-faced inward surface 90. The backing layer may be bonded to the second side-faced inward surface 90. In such an arrangement, the adhesive composition may be peelably bonded to the first outer portion 140. Optionally, the repositionable pressure-sensitive adhesive 150 may be a mixture of adhesive compositions, some of which are carried on the backing layer bonded to the first outer portion 140, and some of which are carried on the backing layer bonded to the second side-faced inward surface 90. Such an arrangement is analogous to bonding two lengths of single-sided tape together, wherein the adhesive sides of each length of tape face each other.

[0028] In an arrangement where the first outer portion 140 directly engages with the inward-facing surface 90 of the second side panel, if the closed bag 10 is inverted, the closure 40 can prevent the contents of the bag 10 from spilling out through the peel resistance between the repositionable pressure-sensitive adhesive 150 and the elements on which the repositionable pressure-sensitive adhesive 150 is peelably bonded. The peel force can be generated by the lateral pressure of the contents of the bag 10 pressing outward onto the first side panel 20 and the second side panel 30, and the weight of the contents of the bag 10 on the closure 40.

[0029] The free flange 160 may have a free flange length along the longitudinal axis L. This free flange length may be less than or equal to the closure length. The closure length and the free flange length may be measured along the longitudinal axis L. The closure length and the free flange length are scalars. The closure length is a measure of the length of the portion of the closure 40 intended to be opened and reclosed. The free flange length is the length of the free flange along the longitudinal axis L. The closure length may be the length from one first side panel lateral edge 70 and the second side panel lateral edge 100 to the opposite first side panel lateral edge 70 and the second side panel lateral edge 100.

[0030] The length of the free flange can be the same as the length of the closure. In this arrangement, the user can grasp or clamp the free flange 160 at any point along the longitudinal axis L to open the package, for example by applying a peeling force to the free flange 160 with one hand to peel the first outer portion 140 from the inward-facing surface 90 of the second side piece held by the other hand. This makes the bag 10 easier to open compared to a shorter free flange 160. For example, the length of the free flange can be less than about 20%, optionally less than about 10%, optionally less than about 5% of the closure length. This arrangement presents a challenge for the user to locate the free flange 160 so that the bag 10 can be opened easily. The free flange 160 can be positioned at or near the midpoint of the closure 40 along the longitudinal axis L. Optionally, the free flange 160 can be positioned closer to the lateral edge of the bag 10 than the midpoint of the closure 40 along the longitudinal axis L. The free flange 160 may have a length of about 10 mm to about 40 mm, and optionally about 15 mm to about 30 mm, along the longitudinal axis L.

[0031] Optionally, the closure 40 may include two free flanges 160. Optionally, one of the free flanges 160 may be positioned closer to a set of lateral edges of the bag 10 than the midpoint of the closure 40 along the longitudinal axis L, and the other free flange 160 may be positioned closer to an opposite set of lateral edges of the bag 10 than the midpoint of the closure 40 along the longitudinal axis L. In this arrangement, the closure 40 may have two free flanges 160, each of which is closer to a set of lateral edges than the midpoint of the closure 40 along the longitudinal axis L. That is, the two free flanges 160 may be positioned toward, near, or adjacent to an opposite end of the closure 40. This arrangement allows the bag 10 to be opened with both hands because at least one free flange 160 is located at a set of lateral edges from which the user may tend to move away from their body orientation when opening the bag 10. Figure 2 Compared to the bag shown, bag 10 may include a second flexible corner piece 170 to provide a closure 40 with an additional mechanism to prevent opening when the closed bag 10 is inverted and lateral pressure is applied to the contents of the bag 10 on the first side piece 20 and the second side piece 30. Figure 3Similar to the first flexible corner piece 120, the second flexible corner piece 170 may extend along the longitudinal axis L. The second flexible corner piece 170 may include a second outer portion 180 that is bonded to the inward-facing surface 90 of the second side piece outside the inner volume 50. The second flexible corner piece 170 may include a second inner portion 190 extending from the second outer portion 180 and located inside the inner volume 50. A repositionable pressure-sensitive adhesive 150 may peelably bond the first outer portion 140 to the second inner portion 190 to peelably indirectly bond the first outer portion 140 to the inward-facing surface 90 of the second side piece through the second inner portion 190. The second inner portion 190 may have a distal end 200 oriented toward the inner volume 50. The second inner portion 190 is referred to as the inner portion because the second inner portion 190 may define or form a portion of the inner volume 50, and the contents of the bag 10 may contact the second inner portion 190 when the bag 10 is closed. Figure 3 The arrangement shown has an internal volume 50 defined by a portion of a first side panel 20, a portion of a second side panel 30, a first internal portion 130, and a second internal portion 190.

[0032] The second flexible angle member 170 may be flexible in its extension from the second outer portion 180 around the second inner portion 190. The second inner portion 190 may pivot about its extension from the second outer portion 180. The second outer portion 180 is the portion of the second flexible angle member 170 that is joined to the inward-facing surface 90 of the second sheet. The second flexible angle member 170 may be a continuous substrate. That is, the second flexible angle member 170 may be formed from a single substrate.

[0033] The repositionable pressure-sensitive adhesive 150 may include a backing layer and an adhesive composition. The adhesive composition may be carried on the backing layer. The backing layer may be bonded to a first outer portion 140. In such an arrangement, the adhesive composition may be peelably bonded to a second inner portion 190. The backing layer may be bonded to the second inner portion 190. In such an arrangement, the adhesive composition may be peelably bonded to the first outer portion 140. Optionally, the repositionable pressure-sensitive adhesive 150 may be a mixture of adhesive compositions 150, some of which are carried on the backing layer bonded to the first outer portion 140, and some of which are carried on the backing layer bonded to the second inner portion 190. Such an arrangement is analogous to bonding two lengths of single-sided tape together, wherein the adhesive sides of each length of tape face each other.

[0034] The repositionable pressure-sensitive adhesive 150 can be positioned on a surface selected from: a first outer portion 140 oriented toward the second inner portion 190, a second inner portion 190 oriented toward the first outer portion 140, and combinations thereof. The repositionable pressure-sensitive adhesive 150 can be disposed on a backing layer bonded to the corresponding portion.

[0035] In an arrangement including the second flexible angular member 170, the bag can be opened in a manner similar to that described above, wherein the free flange 160 is used to peel the first outer portion 140 and the inward-facing surfaces 90 of the second side piece apart from each other, the difference being that the free flange 160 is used to generate a peeling force to peel the first outer portion 140 and the second inner portion 190 apart from each other. Figure 3 In this arrangement, the free flange 160 has a free flange length shorter than the closure length. In such an arrangement, the free flange 160 can be a tab that a user can manipulate to apply the necessary force to peel open the closure 40. Providing a relatively short free flange 160 may require the user to expend considerable cognitive effort to identify the flange 160 and determine how to manipulate the flange 160 to open the closure 40.

[0036] At least a portion of the free flange 160 may be color-contrasting with the first outer portion 140. This arrangement helps the user locate the free flange 160 to open the closure. Providing the free flange 160 with a color that contrasts with the rest of the closure may be particularly useful if the free flange 160 has a short free flange length, since there may only be small tabs for the user to peel off the closure 40.

[0037] The bag 10, including a closure 40, is adapted to retain the contents of the bag 10 when it is inverted. The closure includes a first flexible corner piece 120 and a second flexible corner piece 170. When the bag 10 is in an upright position and the closure 40 is oriented upwards, the first outer portion 140 and the second inner portion 190 will tend to be vertically aligned, although minor variations in orientation may occur due to the protrusions and wrinkles of the bag 10 and the accompanying deformation of the closure 40. When the bag 10 is inverted, the contents of the bag 10 will rest on the closure 40, and the lateral pressure of the contents of the bag 10 will tend to separate the first side piece 20 and the second side piece 30. Figure 4Through the first flexible angle member 120 and the second flexible angle member 170, the first outer portion 140 and the second inner portion 190 will tend to rotate in opposite directions relative to the first inner portion 130 and the second outer portion 180, respectively, and are connected by a slightly straight or drooping line. That is, the first outer portion 140 can pivot about a position where it extends from the first inner portion 120, and the second inner portion 190 can pivot about a position where it extends from the second outer portion 180.

[0038] When the bag 10 is inverted, the closure 40 is maintained closed by the connection between the first outer portion 140 and the second inner portion 190 provided by the repositionable pressure-sensitive adhesive 150. The shear strength of the repositionable pressure-sensitive adhesive 150 and the shear strength of the connection between the repositionable pressure-sensitive adhesive 150 and the surfaces on which it is peelably bonded or opposite to the repositionable pressure-sensitive adhesive 150 resist separation of the two portions by shear movement of the first outer portion 140 and the second inner portion 190 relative to each other.

[0039] Typically, repositionable pressure-sensitive adhesives 150 tend to be stronger when pure normal or pure shear forces are applied compared to peel forces. Peel forces are applied locally at the peel interface and therefore tend to generate locally higher normal and / or shear stresses at the peel interface. Pure normal and pure shear forces are applied over a larger area than peel forces and therefore tend to generate relatively lower normal and shear stresses. In the separation peel mode, most (if not all) of the force is applied at or near the peel interface, which has a finite area or volume, and the force can be transferred as stress to or through that area or volume, thereby generating locally higher normal and / or shear stresses.

[0040] like Figure 3 As shown, when the bag 10, including the closure 40, is in an upright position, the user can grasp the free flange 160 to apply a peel force at the interface of the first outer portion 140 and the second inner portion 190, the closure including a first flexible corner member 120 and a second flexible corner member 170. The peel strength of the repositionable pressure-sensitive adhesive 150 determines how easy or difficult it is for the user to peel the first outer portion 140 and the second inner portion 190 apart.

[0041] like Figure 4As shown, when the closed bag 10 is inverted, the repositionable pressure-sensitive adhesive 150 connecting the first outer portion 140 and the second inner portion 190 primarily bears the shear load. Thus, the first outer portion 140 and the second inner portion 190 are securely connected to each other, and the article 2 in the internal volume 50 of the bag 10 may not spill out of the bag 10.

[0042] Bag 10 may have a removable tear strip 210 to provide a structure that protects the closure 40, preventing accidental opening of bag 10 once it is sealed in the packaging facility until the user wishes to obtain article 2. Figure 5 The removable tear strip 210 may be a predetermined weak line near the top of the bag. The removable tear strip 210 can bond the first side panel 20 to the second side panel 30. The weak line may be a series of through perforations, through slits, partial perforations, notches, or other structural weakening of one or both of the first side panel 20 and the second side panel 30. The weak line may be a discontinuous cut and formed by laser. The removable tear strip 210 may have a starting end 215 to concentrate and guide the tearing force applied by the user toward the removable tear strip 210.

[0043] The first side panel 20 and the second side panel 30 may be joined to each other at the first side panel lateral edge 70 and the second side panel lateral edge 100, top 65 and / or bottom 60 by heat sealing, glue, adhesive, stitching, etc. Optionally, the first side panel 20 and the second side panel 30 may be connected to each other across any one of the first side panel lateral edge 70 and the second side panel lateral edge 100, top 65 or bottom 60 as described herein. One or both of the first side panel inward-facing surface 80 and the second side panel inward-facing surface 90 may be coated with a heat-sealable composition.

[0044] The repositionable pressure-sensitive adhesive 150 can be carried on the backing layer 155. Figure 6 The backing layer 155 can be bonded to the second inner portion 190 or the first outer portion 140. The backing layer 155 can be bonded to the second inner portion 190 or the first outer portion 140 by heat sealing, glue, adhesive, sewing, etc. The adhesive to which the backing layer 155 is bonded is stronger in terms of shear force, normal force, and peel force than the repositionable pressure-sensitive adhesive 150 itself, such that when the bag 10 and its contents are inverted, the backing layer 155 does not separate from the portion to which it is bonded.

[0045] The first inner portion 130 of the first flexible angle member 120 can be joined to the first side piece 20 by heat sealing, glue, adhesive, sewing, etc. Similarly, the second outer portion 180 of the second flexible angle member 170 can be joined to the second side piece 30 by heat sealing, glue, adhesive, sewing, etc.

[0046] Bag 10 may have more than about 80% by weight, optionally more than about 90% by weight, and optionally more than about 95% by weight of paper. The greater the weight fraction of paper, the easier bag 10 is to recycle.

[0047] Bag 10 can be a four-side sealed bag, a corner gusseted bag, a back-sealed bag, a three-side sealed bag, a K-sealed stand-up bag, a round sealed stand-up bag, or a regular sealed stand-up bag.

[0048] A repositionable pressure-sensitive adhesive 150 may be disposed on both the second inner portion 190 and the first outer portion 140. For example, as a non-limiting example, a portion of the repositionable pressure-sensitive adhesive 150 may be carried on a backing layer 155 bonded to the second inner portion 190, and another portion of the repositionable pressure-sensitive adhesive 150 may be carried on a backing layer 155 bonded to the first outer portion 140, such as... Figure 7 As shown. In this arrangement, bag 10 can be opened by pulling open the first outer portion 140 with one hand and the second inner portion 190 with the other hand, and some adhesive 150 remains on the backing layer 155 bonded to the first outer portion 140, and some adhesive 150 remains on the backing layer 155 bonded to the second inner portion 190. This arrangement can provide mechanical properties similar to those when the adhesive sides of two lengths of tape are brought face to face along their lengths and then peeled off, similar in that the width of the tape peeled off in this manner is relatively wide.

[0049] Bag 10 can be opened by a method involving multiple steps. The second side panel 30 can be grasped with one hand at its top edge 11, which is opposite to the bottom 60 and located outside the inner volume 50. The free flange 160 can also be grasped with the other hand. The free flange 160 and the second side panel 30 can be peeled off from each other to separate the first outer portion 140 and the second inner portion 190 along a repositionable pressure-sensitive adhesive 150, thereby opening bag 10. Optionally, the first outer portion 140 and the second inner portion 190 can be re-engaged with each other along the repositionable pressure-sensitive adhesive 150 to close bag 10.

[0050] Optionally, the method of opening bag 10 may include multiple steps. The second side panel 30 may be grasped with one hand at its top edge 11. Alternatively, the free flange 160 may be grasped with the other hand. The free flange 160 and the second side panel 30 may be peeled apart from each other along a repositionable pressure-sensitive adhesive 150 to open bag 10. Optionally, the method may include the step of re-engaging the first outer portion 140 and the second side panel 30 together along the repositionable pressure-sensitive adhesive 150 to close bag 10.

[0051] Substrate

[0052] Paper is a cellulose fiber web, optionally containing small amounts of additional components. To provide recyclability of bag 10, bag 10 may be primarily composed of a paper base. The paper base has more than 80% by weight of cellulose fibers. The paper base may contain various coatings, varnishes, inks, etc., which are typical for paper packaging, and such materials are considered part of the paper base. For technical benefits, the cellulose fiber web constituting the paper base may also contain small amounts of other additives and fillers, which are also considered part of the paper base. The first side sheet 20 and the second side sheet 30 may have more than about 80% by weight of paper, optionally more than about 90% by weight of paper, and optionally more than about 95% by weight of paper. The weight of each of the first side sheet 20 and the second side sheet 30 includes coatings, varnishes, inks, additives, and fillers.

[0053] The first side panel 20 and the second side panel 30 may be paper-based. One or both of the inward-facing surface 80 of the first side panel and the inward-facing surface 90 of the second side panel may be coated or partially coated with a thermoplastic material only when necessary to facilitate the joining of the first side panel 20 and the second side panel 30. The coating on the inward-facing surface 80 of the first side panel may also facilitate the joining of the first flexible corner piece 120 to the first side panel 20. The coating on the inward-facing surface 90 of the second side panel may also facilitate the joining of the second flexible corner piece 170 to the second side panel 30. The bag 10 may be formed by folding a paper base across the bottom 60 of the bag 10, and the first side panel 20 and the second side panel 30 may be heat-sealed to each other to form a heat seal at the junction of the first side panel lateral edge 70 and the second side panel lateral edge 100.

[0054] Furthermore, the inward-facing surfaces 80 of the first side panel and 90 of the second side panel may be coated with a polymer material to prevent oxygen, water, and / or water vapor from permeating the respective panels. Similarly, the outward-facing surfaces of the first side panel 20 and the second side panel 30 may include coatings, varnishes, or inks to provide the bag 10 with the desired overall aesthetics, high-quality printing, and / or technical performance.

[0055] The inward-facing surfaces 80 of the first side panel and 90 of the second side panel may be coated with a thin layer of polymer coating. As a non-limiting example, the coating may be selected from low-density polyethylene, linear low-density polyethylene, high-density polyethylene, polypropylene, polyacrylamide, linear polyacrylamide, styrene-butadiene copolymer, and combinations thereof. The coating may be applied by tank coating, spraying, extrusion coating, dispersion, or printing onto the skeleton of a paper substrate. Optionally, the coating may be applied as a powder, which is heated and / or compressed to form the coating. The coating on the inward-facing surfaces 80 of the first side panel and / or 90 of the second side panel may facilitate heat-sealing, acoustic-sealing, or heat-melting the inward-facing surface 80 of the first side panel to the inward-facing surface 90 of the second side panel along the lateral edges 70 and 100 of the first and second side panels. The inward-facing surfaces may be coated at and near the locations where heat sealing is used to join the elements of the bag 10. That is, portions of the inward-facing surfaces may be uncoated. Optionally, portions of the inward-facing surfaces may be uncoated, exposing the contents of the bag 10 to the paper. Paper can help absorb moisture from the contents or air space within bag 10. This may be useful if the contents are soluble unit-dose laundry detergent products, as excess moisture may create pinholes in the product or cause the products to stick together. The inward-facing surface may be uncoated, which may be useful if glue or other adhesives are used to join the elements of bag 10. Optionally, the outward-facing surface may be coated with a thin layer of polymer coating to limit or prevent moisture from entering bag 10. Optionally, the first side panel 20 and the second side panel 30 may be paper laminates, wherein the inner layer is a polymer material layer that can limit or prevent moisture from entering bag 10 and expose the paper material to the internal volume 50 of bag 10. The paper substrate forming the first side panel 20 and the second side panel 30, and optionally the flexible corner piece described herein, may have a density of about 20 g / m³. 2 Approximately 500g / m 2 Optional, approximately 20g / m 2 Approximately 300g / m 2 Optional, approximately 30g / m 2 Approximately 150g / m 2The basis weight includes coatings, varnishes, inks, additives, and fillers. The outer surface 82 of the first side sheet and the outer surface 92 of the second side sheet may be discontinuously coated or uncoated. Less than about 10%, optionally less than about 5%, of the area of ​​the outer surface 82 of the first side sheet and the outer surface 92 of the second side sheet may be coated. To improve recyclability, it may be advantageous that at least one surface of each sheet is discontinuously coated, uncoated, or only a small portion is coated, so that the paper constituting such sheets can be easily separated from any coatings used. Furthermore, uncoated, discontinuously coated, or substantially uncoated (e.g., less than about 10% of the outer surface 82 of the first side sheet and the outer surface 92 of the second side sheet, or a smaller percentage as described above) outer-facing surfaces 82 make it clear to the user of bag 10 that bag 10 is intended for recycling in the paper recycling stream. As a non-limiting example, the paper substrate used for the side panels and flexible corner pieces may be MONDI AEGIS 84 g / m² white paper or MONDI AEGIS 136 g / m² brown paper purchased from Mondi, PLC (Addlestone, Surrey, United Kingdom).

[0056] The first flexible corner piece 120 and the second flexible corner piece 170 may also be paper-based and further incorporated with coatings, varnishes, inks, additives, and fillers. The coating may be polymer coating 225 or partially polymer coating 225, as described above with respect to the first side piece 20 and the second side piece 30, to obtain the same benefits. Figure 8 The first flexible corner piece 120 and the second flexible corner piece 170 may each have an outward-facing surface 220. The outward-facing surfaces 220 may be oriented away from each other. At least a portion of the inward-facing surface 80 of the first side piece, the inward-facing surface 90 of the second side piece, and each outward-facing surface 220 may be coated or partially coated with a polymer coating 225. The outward-facing surface 220 of the first flexible corner piece 120 may be heat-sealed 230 to the inward-facing surface 80 of the first side piece by the polymer coating 225. The outward-facing surface 220 of the second flexible corner piece 170 may be heat-sealed 230 to the inward-facing surface 90 of the second side piece by the polymer coating 225. The polymer coating 225 may have a thickness of about 2 μm to about 50 μm, optionally about 4 μm to about 30 μm, optionally about 6 μm to about 20 μm. The polymer coating 225 may be polyethylene.

[0057] Each of the first flexible corner piece 120 (including the free flange 160) and the second flexible corner piece 170 may have more than about 80% by weight of paper, optionally more than about 90% by weight of paper, and optionally more than about 95% by weight of paper. The weight of each of the first flexible corner piece 120 (including the free flange 160) and the second flexible corner piece 170 includes coatings, varnishes, inks, additives, and fillers (if present in or on the respective flexible corner piece).

[0058] Optionally, the first flexible corner piece 120 and / or the second flexible corner piece 170 may be a polymer film. If these components are polymer films, it is desirable that these components constitute less than about 20% by weight, or even less than about 15% by weight, or even less than about 10% by weight of the bag 10, so that the bag 10 can be recycled in a typical recycling stream. The first flexible corner piece 120 may be joined to the first side piece 20 by heat sealing, glue, adhesive, sewing, etc. The second flexible corner piece 170 may be joined to the second side piece 30 by heat sealing, glue, adhesive, sewing, etc.

[0059] Any portion of the substrate from which the repositionable pressure-sensitive adhesive 150 can be peeled may be surface-treated or include a release layer, such that the repositionable pressure-sensitive adhesive 150 can be cleanly peeled from that portion. For example, the surface may be treated with a silicone release coating or wax. Optionally, the release layer may be a thin layer of low-density polyethylene, linear low-density polyethylene, high-density polyethylene, polypropylene, polyacrylamide, linear polyacrylamide, or a similar thermoplastic polymer.

[0060] Repositionable pressure sensitive adhesive and backing layer

[0061] The repositionable pressure-sensitive adhesive 150 provides the ability to reseal the bag 10 after the closure 40 has been opened. The repositionable pressure-sensitive adhesive 150 is an adhesive bonded to a substrate by applying pressure. The pressure-sensitive adhesive 150 may have an average peak tack force measured according to ASTM D6195-03 (re-approved in 2019) Test Method A (using a tensile tester), which decreases by less than 80%, optionally less than 60%, optionally less than 50%, and optionally less than 20% after 80 cycles of opening and closing of the pressure-sensitive adhesive 150 against the surfaces joined in the bag 10. Since a user may remove some contents from the bag 10 each time it is opened and closed, this tends to reduce the strength of the closure 40 required to maintain the closure of the bag 10 when it is inverted; therefore, the peak tack force decreasing to a certain level with each cycle may not excessively weaken the sealing function. The repositionable pressure-sensitive adhesive 150 can be repositioned from approximately 10 to approximately 200 times. The repositionable pressure-sensitive adhesive 150 can be repositioned from approximately 1 month to approximately 24 months. Bond strength can be affected by the amount of pressure applied and the properties of the substrate, such as smoothness and surface energy. The repositionable pressure-sensitive adhesive 150 tends to exhibit viscoelastic properties. The repositionable pressure-sensitive adhesive 150 forms a bond with the substrate by flowing through the adhesive and wetting it. The integrity of the bond is maintained by the cohesive strength of the repositionable pressure-sensitive adhesive 150 and the intermolecular interactions between the adhesive and the substrate. The repositionable pressure-sensitive adhesive 150 can form a viscoelastic bond that permanently bonds and adheres when pressure is applied manually and activation (e.g., water, solvent, or heat) is not required.

[0062] The repositionable pressure-sensitive adhesive 150 may include a variety of compositions and may be composed of elastomeric polymers with or without tackifiers. The repositionable pressure-sensitive adhesive 150 may be selected from acrylate and methacrylate homopolymers or copolymers, butyl rubber-based systems, silicones, nitrile, styrene block copolymers, ethylene vinyl acetate, polyurethanes, vinyl esters and amides, olefin copolymer materials, natural or synthetic rubbers, and mixtures thereof. The repositionable pressure-sensitive adhesive 150 may be selected from rubber adhesives, acrylic adhesives, modified acrylic adhesives, silicone adhesives, and combinations thereof. The performance of rubber or rubber-based repositionable pressure-sensitive adhesives 150 may be inferior to other repositionable pressure-sensitive adhesives 150.

[0063] The repositionable pressure-sensitive adhesive 150 is a removable and repositionable pressure-sensitive adhesive 150 because it can be separated from the substrate without damaging the repositionable pressure-sensitive adhesive 150 itself or the substrate. The repositionable pressure-sensitive adhesive 150 can provide approximately 10 to 200 opening and resealing cycles for the closure 40. The repositionable pressure-sensitive adhesive 150 can be AR101, SR106, R1490M, or SR692N, available from AVERY DENNISON (Glendale, California, United States of America).

[0064] The repositionable pressure-sensitive adhesive 150 can be applied directly to a substrate or carried on a backing layer 155 bonded to the substrate, such that the backing layer 155 is located between the repositionable pressure-sensitive adhesive 150 and the substrate. The backing layer can be paper, film, or foil. Suitable backing layers 155 include polymers, including but not limited to polyethylene terephthalate, polyethylene, polypropylene, copolymers such as polyethylene-propylene, polyethylene-octene, olefin block copolymers, and polystyrene films. The backing layer 155 can be selected from polyesters, polypropylene, polyethylene, polyethylene / polypropylene copolymers, UHMS-PE, polyvinyl chloride, polyimide, polyamide, polytetrafluoroethylene, polyvinyl alcohol, polyurethane, polyvinyl fluoride, and combinations thereof. The backing layer 155 can be selected from crepe paper, flatback paper, kraft paper, glossy uncoated kraft paper, mechanically glossy uncoated kraft paper, parchment, supercalendered kraft paper, clay-coated kraft paper, poly-coated kraft paper, cellophane, and combinations thereof. The backing layer 155 can be selected from cotton, glass cloth, vinyl cloth, and combinations thereof. The backing layer 155 can be made of fiber. The backing layer 155 can be made of aluminum, copper, lead, stainless steel, and combinations thereof. The backing layer 155 can be neoprene rubber. The backing layer 155 can have a strength of approximately 50 g / m². 2 Approximately 400g / m 2 Optional, approximately 80g / m 2 Approximately 300g / m 2 Optional, approximately 100g / m 2 Approximately 200g / m 2 The basis weight. The paper backing layer 155 can help improve the recyclability of bag 10.

[0065] The backing layer 155 can be bonded to the substrate by heat sealing, adhesive, bonding agent, stitching, etc. The repositionable pressure-sensitive adhesive 150 can be a continuous coating on one side of the backing layer 155. Optionally, the repositionable pressure-sensitive adhesive 150 can be applied to a portion of one side of the backing layer 155. The repositionable pressure-sensitive adhesive 150 can be a discontinuous coating on one side of the backing layer 155, such as islands of the repositionable pressure-sensitive adhesive 150. The repositionable pressure-sensitive adhesive 150 can have a thickness of about 5 micrometers to about 500 micrometers.

[0066] The repositionable pressure-sensitive adhesive 150 can be located on a surface selected from the first outer portion 20, the inner-facing surface 90 of the second side sheet, and combinations thereof.

[0067] The repositionable pressure-sensitive adhesive 150 can be a water-based acrylic repositionable pressure-sensitive adhesive. The repositionable pressure-sensitive adhesive 150 can be a water-based styrene-butadiene copolymer latex. The repositionable pressure-sensitive adhesive 150 can be a rubber-based repositionable pressure-sensitive adhesive in a solvent solution. The repositionable pressure-sensitive adhesive 150 can be a polyurethane elastomer-based adhesive. The repositionable pressure-sensitive adhesive 150 can be Ivy Grap Tape, purchased from HONGXIN-SHOP on March 26, 2021 via www.amazon.com. The repositionable pressure-sensitive adhesive 150 can be a hot melt adhesive. Hot melt repositionable pressure-sensitive adhesives 150 can offer greater flexibility in the formulation chemistry of such hot melts.

[0068] As a non-limiting example, the repositionable pressure-sensitive adhesive 150 may be TACKWHITE NA 55, TACKWHITE AMC 20, TACKWHITE AMC 3D, TACKWHITE AMC 24, TACKWHITE AMC 4D, TACKWHITE AP 5M, TACKWHITE SB4 B2, TACKWHITE SB5 SL5, SOLACRIL SPR 12M3, SOLACRIL WS 33, SOLACRIL 44, SOLACRIL WS 60, SOLACRIL WS 40N, SOLACRIL 206, SOLACRIL 306, SOLACRIL 203, SOLACRIL 303, or TACKMELT R 008, purchased from ICHEMCO (Milan, Italy). Repositionable pressure-sensitive adhesives may be ROBOND PS-9260, ROBOND PS-8120HV, or ROBOND PS-8942, available from Dow, Inc. (Midland, Michigan, United States of America). Repositionable pressure-sensitive adhesives may be styrene-isoprene-styrene copolymers (SIS). Repositionable pressure-sensitive adhesive 150 may be SAVARE PL501ZK, available from SAVARE ICsrl (Milano, Italy). Repositionable pressure-sensitive adhesive 150 may be a mixture of ethylene-vinyl acetate and styrene block copolymers, such as decorative tapes, such as FASHION TAPE sold at www.hollywoodfashionsecrets.com. Repositionable pressure-sensitive adhesive 150 may have a failure load of approximately 0.05 MPa to approximately 0.5 MPa according to ASTM D3165-07 (2014). The repositionable pressure-sensitive adhesive 150 may have an average T-peel strength of about 0.01 N / mm to about 0.5 N / mm according to ASTM D903-98 (2017).

[0069] The first outer portion 140 can be peelably bonded to the second inner portion 190 on the peel area 152 by a repositionable pressure-sensitive adhesive 150. Figure 9 The stripping zone 152 may have approximately 100 mm. 2 Approximately 21000 mm 2The peel area is a scalar measurement of the area of ​​the peel region 152. The peel region 152 is the location where the first outer portion 140 and the second inner portion 190 are peelably joined. The repositionable pressure-sensitive adhesive 150 is the material by which the first outer portion 140 and the second inner portion 190 are peelably joined to each other. The peel region 152 can be a continuous area (such as a continuous trench coating area) and can have islands of unjoined portions of the first outer portion 140 and the second inner portion 190 that are not part of the peel region and are not included in the area of ​​the peel region. The peel region 152 can also be a discontinuous area, such as islands, strips, loops, etc. of the repositionable pressure-sensitive adhesive.

[0070] The closure length is a measure of the length of the portion of the closure 40 intended to be opened and reclosed along the longitudinal axis L, and can be from about 100 mm to about 420 mm. The closure height is a measure of the height of the portion of the closure 40 intended to be opened and reclosed (i.e., the repositionable pressure-sensitive adhesive 150), and is measured orthogonally to the longitudinal axis L, and can be from about 1 mm to about 50 mm, optionally from about 5 mm to about 50 mm, optionally from about 5 mm to about 30 mm, optionally from about 10 mm to about 25 mm. Closure heights less than 1 mm or even 5 mm can be challenging for the user to properly reclose the closure, as the user may have to carefully identify and position the repositionable pressure-sensitive adhesive 150 and properly engage it with the surfaces to be joined. Closure heights greater than 50 mm can be difficult for the user to operate. When the closure 40 is opened, a closure height greater than 50 mm may uncontrollably fold or wrinkle, and adjacent portions of the repositionable pressure-sensitive adhesive 150 may adhere to each other, making it difficult to properly reseal the closure 40. Furthermore, a large closure may increase the non-paper portion of the bag 10 because a larger amount of repositionable pressure-sensitive adhesive 150 may be used. Repeated opening and resealing of the closure 40 may contaminate the pressure-sensitive adhesive 150 or the surfaces it adheres to. As a non-limiting example, sources of contamination may include dust from the air, dust from the contents of the bag 10, oil or other substances transferred from the user's fingers, water, or other substances that the closure 40 is exposed to when it is opened. The greater the closure height, the less sensitive the closure 40 may be to contamination. A closure height less than 1 mm may be more sensitive to contamination than desired.

[0071] Bag 10 can hold approximately 10g to approximately 5000g of product 2. Bag 10 can hold approximately 100g to approximately 2500g of product 2. Bag 10 can hold approximately 400g to approximately 1800g of product 2. The ratio of the peel area to the mass of the product 2 contained in bag 10 can be approximately 80mm². 2 / 100g to approximately 1250mm 2 / 100g, optional area approximately 250mm 2 / 100g to approximately 1000mm 2 / 100g, approximately 300mm (optional) 2 / 100g to approximately 800mm 2 / 100g.

[0072] For a bag 10 comprising a first flexible corner piece 120 and a second flexible corner piece 170 as described herein and containing articles 2 in a consistent unit, the product of the failure load of the repositionable pressure-sensitive adhesive 150 according to ASTM D3165-07 (2014) and the peel area may be approximately 2 to approximately 500 times, optionally approximately 20 to approximately 300 times, optionally approximately 50 to approximately 200 times, and optionally approximately 80 to 180 times the cumulative weight of the articles 2 contained in the bag 10. The failure load according to ASTM D3165-07 (2014) is reported in megapascals. In the above relationship, the conversion of the failure load according to ASTM D3165-07 (2014) can be avoided by providing the peel area in square meters and the force caused by the weight of the articles 2 in the bag 10 in meganewtons. Unbound by theory, it is considered that by providing a failure load of the repositionable pressure-sensitive adhesive 150 according to ASTM D3165-07 (2014) and the product of the peel area within the range of approximately 2 to approximately 500 times, optionally approximately 5 to approximately 300 times, optionally approximately 5 to approximately 100 times, optionally approximately 2 to approximately 50 times, and optionally approximately 2 to approximately 20 times the weight of the article 2 contained in the bag 10, the likelihood of viscoelastic failure of the adhesive 150 under expected use during the expected life cycle of the bag 10 and the article 2 contained therein, it is sufficient to limit the likelihood of viscoelastic failure of the adhesive 150 under expected use during the expected life cycle of the bag 10 and the article 2 contained therein.

[0073] Example 1 of bag 10 is constructed as follows. The length of bag 10 along the longitudinal axis L is 320 mm. The height of bag 10, measured orthogonally to the longitudinal axis, is 300 mm. The first side panel 20 and the second side panel 30 are 130 g / m². 2The paper has a 6μm polyethylene coating on the inward-facing surface 80 of the first side panel and the inward-facing surface 90 of the second side panel. The first flexible corner piece 120 consists of two layers of 3M SCOTCH 244 yellow masking paper tape, each 50mm wide, assembled uniformly with their adhesive sides facing each other. The second flexible corner piece 170 consists of two layers of 3M SCOTCH 244 yellow masking paper tape, cut to 40mm wide and assembled uniformly with their adhesive sides facing each other. The first flexible corner piece 120 and the second flexible corner piece 170 are attached to their respective side panels using double-sided adhesive tape (TESA FIX 4970 12mm). A 12.5mm wide fashion tape purchased from Hollywood Fashion Secrets was used as the repositionable pressure-sensitive adhesive 150 and adhered to the exposed adhesive of the 3MSCOTCH 244 yellow masking tape forming the first outer portion 140 of the first flexible corner piece 170, and then bonded to the second inner portion 190. The bag 10 was constructed in a conditioning chamber at 23°C and 50% relative humidity. The tape and repositionable pressure-sensitive adhesive 150 of Example 1 were bonded using a FINAT 2kg roller. The first side panel 20 and the second side panel 30 were not bonded at the bottom 60 of the bag. The overall structure of Example 1 is similar. Figure 4 The structure shown.

[0074] Example 2 of bag 10 is constructed as follows. The length of bag 10 along the longitudinal axis L is 320 mm. The height of bag 10, measured orthogonally to the longitudinal axis, is 300 mm. The first side panel 20 and the second side panel 30 are 130 g / m². 2The first side panel has an inward-facing surface 80 and an inward-facing surface 90 with a 6 μm polyethylene coating. The first flexible corner piece 120 consists of two layers of 3M SCOTCH 244 yellow masking paper tape, each 50 mm wide, assembled uniformly with their adhesive sides facing each other. The second flexible corner piece 170 consists of two layers of 3M SCOTCH 244 yellow masking paper tape, cut to 40 mm wide and assembled uniformly with their adhesive sides facing each other. Unlike Embodiment 1 described above, for the first flexible corner piece 120, the first outer portion 140 and the first inner portion 130 are attached together to the first side panel 20 using 25 mm wide double-sided tape TESA FIX 4970. Similarly, unlike Embodiment 1 described above, for the second flexible corner piece 170, the second inner portion 190 and the second outer portion 180 are attached together to the second side panel 30 using 25 mm wide double-sided tape TESA FIX 4970. A 12.5mm wide fashion tape purchased from Hollywood Fashion Secrets was used as the repositionable pressure-sensitive adhesive 150 and attached to the exposed adhesive of the 3M Scotch 244 yellow masking tape forming the first outer portion 140 of the first flexible corner piece 170, and then bonded to the second inner portion 190. Example 2 illustrates a closure in which the first flexible corner piece 120 and the second flexible corner piece 170 are respectively attached to the first side piece 20 and the second side piece 30. The bag 10 was constructed in a conditioning chamber at 23°C and 50% relative humidity. The tape and the repositionable pressure-sensitive adhesive 150 of Example 1 were bonded using a FINAT 2kg roller. The first side piece 20 and the second side piece 30 were not bonded at the bottom 60 of the bag.

[0075] Invert the bags from Examples 1 and 2 and fill them with approximately 1700g of ARIEL 3-in-1 laundry pods (soluble unit dose detergent product).

[0076] Static load tests were performed on Examples 1 and 2 by suspending each bag containing its contents upside down, so that the closure 40 was subjected to a load. The bags 10 were suspended by a 50mm wide PET strap extending from the center of the top edge 11 to a vertical extent of 150mm beyond each side panel. The time taken for the closure 40 of each bag 10 to open under the load of its contents was recorded.

[0077] Dynamic load testing was also performed by clamping the filled and inverted bag 10 to be tested onto a 250N force sensor. The bag 10 was lifted 15cm and then dropped. The filled bag 10 was allowed to fall freely for 15cm until it was caught by the suspension strap. The impact energy of the freely falling bag 10 was recorded by the force sensor as a peak force in Newtons.

[0078] The results of static and dynamic load tests for Examples 1 and 2 are shown in Table 1 below. Example 1 is a similar example... Figure 4 The bag shown has a general construction, in which a first flexible corner piece 120 and a second flexible corner piece 170 are provided, and a first outer portion 140 and a second inner portion 190 are respectively capable of rotating in opposite directions relative to a first inner portion 130 and a second outer portion 180. Embodiment 2 is a bag 10, in which the first outer portion 140 is attached to a first side panel 20, and the second inner portion 190 is attached to a second side panel 30. In Embodiment 2, the flexible corner pieces cannot be arranged as shown... Figure 4 The rotation is reversed as shown, thereby applying a peeling load primarily to the closure 40.

[0079] Table 1. Static load testing and dynamic load testing of Example 1 and Example 2 .

[0080]

[0081] Based on the test results shown in Table 1, compared to a bag 10 in which the first outer portion 140 and the second outer portion 190 are respectively attached to the first side panel 20 and the second side panel 30, the bag 10 with the first flexible corner piece 120 and the second flexible corner piece 170 (where the first outer portion 140 and the second inner portion 190 can rotate in opposite directions relative to the first inner portion 130 and the second outer portion 180, respectively) exhibits better performance under static and dynamic load tests. The bag 10 of Embodiment 2 is expected to demonstrate the performance of a simple construction, where the closure 40 is merely a repositionable pressure-sensitive adhesive 150 that engages the first side panel 20 and the second side panel 30. In this type of bag 10, the repositionable pressure-sensitive adhesive 150 is expected to primarily bear peel forces when closed and inverted. In the bag 10 of Embodiment 1, the repositionable pressure-sensitive adhesive 150 tends to primarily bear shear loads.

[0082] Example 3 is a variation of Example 1. The difference between Example 3 and Example 1 is that the first flexible corner piece 120 is composed of two layers of 3M SCOTCH 3434 blue masking tape, each 50 mm wide, assembled uniformly with their adhesive sides facing each other. A repositionable pressure-sensitive adhesive 150 is a 25.4 mm wide portion of the exposed 3M SCOTCH 3434 blue masking tape, which is then bonded to the second inner portion 190.

[0083] Example 4 is a variation of Example 3. The difference between Example 4 and Example 3 is that, for the first flexible angle member 120, the first outer portion 140 and the first inner portion 130 are attached together to the first side piece 20 using 25mm wide double-sided adhesive tape TESA FIX 4970. Similarly, unlike Example 3, for the second flexible angle member 170, the second inner portion 190 and the second outer portion 180 are attached together to the second side piece 30 using 25mm wide double-sided adhesive tape TESA FIX 4970.

[0084] Examples 3 and 4 were constructed such that the repositionable pressure-sensitive adhesive 150 in Examples 3 and 4 was a 3M SCOTCH 3434 repositionable pressure-sensitive adhesive 150, in contrast to the 12.5 mm wide fashion tape purchased from HOLLYWOOD FASHION SECRETS used in Examples 1 and 2.

[0085] The results of static and dynamic load tests for Examples 3 and 4 are shown in Table 2 below. Example 3 is a similar example... Figure 4 The bag shown has a general construction, in which a first flexible corner piece 120 and a second flexible corner piece 170 are provided, and a first outer portion 140 and a second inner portion 190 are respectively capable of rotating in opposite directions relative to a first inner portion 130 and a second outer portion 180. Embodiment 4 is a bag 10, in which the first outer portion 140 is attached to a first side panel 20, and the second inner portion 190 is attached to a second side panel 30. In Embodiment 4, the flexible corner pieces cannot be positioned as shown... Figure 4 The rotation is reversed as shown, thereby applying a peeling load primarily to the closure 40.

[0086] Table 2. Static load testing and dynamic load testing of Example 3 and Example 4 .

[0087]

[0088] Based on the test results shown in Table 1, compared to a bag 10 in which the first outer portion 140 and the second outer portion 190 are respectively attached to the first side panel 20 and the second side panel 30, the bag 10 with the first flexible corner piece 120 and the second flexible corner piece 170 (where the first outer portion 140 and the second inner portion 190 can rotate in opposite directions relative to the first inner portion 130 and the second outer portion 180, respectively) exhibits better performance under static and dynamic load tests. The bag 10 of Embodiment 4 is expected to demonstrate the performance of a simple construction, where the closure 40 is merely a repositionable pressure-sensitive adhesive 150 that engages the first side panel 20 and the second side panel 30. In this type of bag 10, the repositionable pressure-sensitive adhesive 150 is expected to primarily bear peel forces when closed and inverted. In the bag 10 of Embodiment 3, the repositionable pressure-sensitive adhesive 150 tends to bear shear loads. The repositionable pressure-sensitive adhesive 150 used in Example 3 performed better than the repositionable pressure-sensitive adhesive 150 used in Example 1 in terms of static load test opening time measurement. The repositionable pressure-sensitive adhesive 150 used in Example 4 performed better than the repositionable pressure-sensitive adhesive 150 used in Example 2 in both static load test opening time measurement and dynamic load test measurement.

[0089] Contents of the bag

[0090] Bag 10 can contain dried food products. These dried food products can be for animal consumption, including human consumption. As a non-limiting example, dried food products can be food pellets, cereal products, ground cereal products, hops, powders, flakes, fruits, dried fruits, dried mushrooms, beans, coffee, sugar, corn products, tea, salt, spices, etc. Bag 10 can also contain fibrous, water-soluble products, such as nonwoven fiber webs carrying water-soluble fibers containing fabric care active substances, oral care active substances, hair care active substances, or skin care or cleaning active substances, hard surface care active substances, etc. As a non-limiting example, bag 10 may contain disposable absorbent products, incontinence clothing, bibs, diapers, sanitary napkins, panty liners, tampons, training pants, wipes, hand soap, oral care appliances, hair care products, skin care products, personal hygiene products, oral products, fabric and clothing conditioning products, fabric or clothing care and / or detergent products, dishwashing products, cleaning products, hard surface cleaning products, oral care products, tablets, topical or oral pain relievers, nutritional supplements, vitamins, probiotics, dietary fiber, dietary minerals, pet food, razors, grooming tools, food products for human consumption, food products for domesticated animals, food products for wild animals, etc.

[0091] Bag 10 may contain a liquid composition, gel composition, paste, dispersion, solid composition, or multiple articles 2. As a non-limiting example, the liquid composition, gel composition, paste, dispersion, solid composition, or multiple articles 2 may be a detergent composition, a fabric softener for laundry, a fragrance additive for laundry, or a laundry care additive. As a non-limiting example, the liquid composition, gel composition, paste, dispersion, solid composition, or multiple articles 2 may be an automatic dishwashing detergent or a hard surface treatment composition. As a non-limiting example, the solid composition may be a blown powder, crystals, coated crystals, melt-molded body, extruded granules, spherical granules, molded granules, tablets, etc. As a non-limiting example, the solid composition may be free-flowing or compacted.

[0092] Product 2 may be a water-soluble unit-dose product 2. The water-soluble unit-dose product 2 may be a water-soluble pouch containing a single dose of the composition, with a volume sufficient to provide benefit in the final application. Pouch 10 may hold approximately 1 to approximately 100 water-soluble unit-dose products 2.

[0093] The water-soluble unit-dose article 2 may include at least one water-soluble membrane shaped such that the unit-dose article includes at least one internal compartment surrounded by the water-soluble membrane. The at least one compartment may include a detergent composition. The water-soluble membrane may be sealed such that the detergent composition does not leak out of the compartment during storage. When the water-soluble unit-dose article is added to water, the water-soluble membrane may dissolve, releasing the contents of the internal compartment into the washing liquid. The detergent composition may be liquid or solid.

[0094] The unit-dose article 2 may include more than one compartment, or even at least two compartments, or even at least three compartments, or even at least four compartments, or even at least five compartments. The compartments may be arranged in a superimposed orientation, i.e., one positioned on top of another. Alternatively, the compartments may be positioned side-by-side, i.e., one immediately adjacent to another. The compartments may even be arranged in a "tire and rim" orientation, i.e., the first compartment is positioned close to the second compartment, but the first compartment at least partially surrounds the second compartment, but does not completely enclose the second compartment. Alternatively, one compartment may be completely enclosed within another compartment.

[0095] Each individual unit dose product 2 may have a weight between 10g and 40g, or even between 15g and 35g.

[0096] The water-soluble film of the unit dose product 2 is soluble in or dispersible in water. Before forming the unit dose product 2, the water-soluble film may have a thickness of 20 micrometers to 150 micrometers.

[0097] The membrane material can be a polymer material. The membrane material can be obtained, for example, by casting, blow molding, extrusion, or blow extrusion of the polymer material. Water-soluble membranes may comprise polyvinyl alcohol homopolymers or polyvinyl alcohol copolymers, optionally blends of polyvinyl alcohol polymers and / or polyvinyl alcohol copolymers, wherein the polyvinyl alcohol copolymer is optionally selected from sulfonated and carboxylated anionic polyvinyl alcohol copolymers, optionally carboxylated anionic polyvinyl alcohol copolymers, optionally blends of polyvinyl alcohol homopolymers and carboxylated anionic polyvinyl alcohol copolymers, or blends of polyvinyl alcohol homopolymers. Optionally, the water-soluble film may comprise a polymer, wherein the polymer may include homopolymers, copolymers, or mixtures of polyvinyl alcohol, polyvinylpyrrolidone, polyepoxides, acrylamide, acrylic acid, cellulose, cellulose ethers, cellulose esters, cellulose amides, polyvinyl acetate, polycarboxylic acids and salts, polyamino acids or peptides, polyamides, polyacrylamide, maleic acid / acrylic acid copolymers, polysaccharides including starch and gelatin, xanthan gum, carrageenan, or mixtures thereof, optionally polyvinyl alcohol homopolymers and / or anionic polyvinyl alcohol copolymers, optionally selected from sulfonated and carboxylated anionic polyvinyl alcohol copolymers, especially carboxylated anionic polyvinyl alcohol copolymers. The film may be those supplied by Monosol (Kuraray Division, Merrillville, Indiana, United States of America) under the trade names M8630, M8900, M8779, and M8310. The film may be opaque, transparent, or translucent. The film may include a printing area. The printing area may be achieved using standard techniques such as flexographic printing or inkjet printing. The membrane may contain an aversive agent, such as a bittering agent. Suitable bittering agents include, but are not limited to, naringin, sucrose octaacetate, quinine hydrochloride, benzyl dinatamide, or mixtures thereof. Any suitable amount of the aversive agent may be used in the membrane. Suitable amounts include, but are not limited to, 1 ppm to 5000 ppm.

[0098] A water-soluble film or a water-soluble unit dose product 2, or both, may be coated with a lubricant. Optionally, the lubricant may be selected from talc, zinc oxide, silica, siloxane, zeolite, silicic acid, alumina, sodium sulfate, potassium sulfate, calcium carbonate, magnesium carbonate, sodium citrate, sodium tripolyphosphate, potassium citrate, potassium tripolyphosphate, calcium stearate, zinc stearate, magnesium stearate, starch, modified starch, clay, kaolin, gypsum, cyclodextrin, or mixtures thereof.

[0099] Optionally, the detergent composition is a fragranced detergent composition. A fragranced detergent composition includes fragrances added to the detergent composition. "Unencapsulated fragrance" herein refers to fragrance compounds added directly to the detergent composition and not present on the encapsulation or carrier material. The composition may also contain a second fragrance source, such as fragrance capsules and / or pre-fragrances, such as fragrances combined with carrier material technology. Unencapsulated fragrances may be formulated into liquid laundry detergent compositions and provided as water-soluble unit-dose articles. The detergent composition may contain 0.01% to 10% of unencapsulated fragrance. In addition to unencapsulated fragrances, the detergent composition may also contain encapsulated fragrances or pre-fragrance technologies or mixtures thereof.

[0100] Laundry detergent compositions may contain non-soap surfactants, wherein the non-soap surfactants include anionic non-soap surfactants and nonionic surfactants. Optionally, the laundry detergent composition may contain between 10% and 60% of a non-soap surfactant by weight of the laundry detergent composition. The weight ratio of the non-soap anionic surfactant to the nonionic surfactant may be from 1:1 to 20:1. The non-soap anionic surfactant may contain linear alkylbenzene sulfonates, alkyl sulfates, or mixtures thereof. The weight ratio of the linear alkylbenzene sulfonate to the alkyl sulfate is from 1:2 to 9:1. An exemplary linear alkylbenzene sulfonate is C 10 -C 16 Alkylbenzenesulfonic acid, or C 11 -C 14 Alkylbenzene sulfonic acid. The term "straight-chain" means that the alkyl group is straight-chain. Alkyl sulfate anionic surfactants may comprise alkoxylated alkyl sulfates or non-alkoxylated alkyl sulfates or mixtures thereof. Alkoxylated alkyl sulfate anionic surfactants are optionally ethoxylated alkyl sulfate anionic surfactants. Alkyl sulfate anionic surfactants may comprise ethoxylated alkyl sulfate anionic surfactants, which optionally have a molar average degree of ethoxylation of 1 to 5. Alkyl sulfate anionic surfactants may comprise non-ethoxylated alkyl sulfates and ethoxylated alkyl sulfates, wherein the molar average degree of ethoxylation of the alkyl sulfate anionic surfactant is 1 to 5. The alkyl portion of the alkyl sulfate anionic surfactant may optionally be derived from fatty alcohols, carbonyl synthetic alcohols, Guerbert alcohols, or mixtures thereof. Optionally, nonionic surfactants may be selected from alcohol alkoxylates, carbonyl synthetic alcohol alkoxylates, Guerbert alcohol alkoxylates, alkylphenol alcohol alkoxylates, or mixtures thereof.

[0101] The laundry detergent composition may contain between 0.01% and 10% of a nonionic surfactant by weight of the laundry detergent composition.

[0102] Optionally, the laundry detergent composition may contain between 1.5% and 20% by weight of the laundry detergent composition, optionally a fatty acid salt, optionally an amine-neutralized fatty acid salt, wherein optionally, the amine is an alkanolamine optionally selected from monoethanolamine, diethanolamine, triethanolamine or mixtures thereof, more optionally monoethanolamine.

[0103] Optionally, the laundry detergent composition is a liquid laundry detergent composition, and optionally, the liquid laundry detergent composition contains less than 15% water by weight of the liquid laundry detergent composition.

[0104] Optionally, the laundry detergent composition is a liquid laundry detergent composition that may contain a non-aqueous solvent selected from 1,2-propanediol, dipropylene glycol, tripropylene glycol, glycerin, sorbitol, polyethylene glycol, or mixtures thereof. Optionally, the liquid laundry detergent composition may contain between 10% and 40% of a non-aqueous solvent by weight of the liquid laundry detergent composition.

[0105] Optionally, the laundry detergent composition comprises auxiliary ingredients selected from the following: enzyme-based detergents, citrates, bleaching agents, bleaching catalysts, dyes, tinting dyes, brighteners, cleaning polymers including alkoxylated polyamines and polyethyleneimine, detergency polymers, surfactants, solvents, dye transfer inhibitors, chelating agents, encapsulated fragrances, polycarboxylate esters, structural agents, pH adjusters, and mixtures thereof.

[0106] Optionally, the laundry detergent composition has a pH between 6 and 10, wherein the pH of the laundry detergent composition is measured in deionized water at a 10% product concentration at 20°C. When the laundry detergent composition is a liquid, it may be Newtonian or non-Newtonian. Optionally, the liquid laundry detergent composition is non-Newtonian.

[0107] Combination

[0108] The following is an example:

[0109] A. A bag (10), comprising:

[0110] A first side piece (20) having a pair of first side piece lateral edges (70) and a first side piece inward-facing surface (80);

[0111] A second side panel (30), the second side panel being opposite to the first side panel and having an inwardly facing surface (90) of the second side panel facing the inward surface of the first side panel, wherein the second side panel is connected to the first side panel across the bottom (60) of the bag and has a pair of second side panel lateral edges (100), wherein each of the first side panel lateral edges engages with an opposing second side panel lateral edge; and

[0112] A closure (40) is opposite to the bottom and extends along a longitudinal axis (L), wherein the closure peelably connects the first side piece and the second side piece, wherein the closure, a portion of the inward-facing surface of the first side piece, a portion of the inward-facing surface of the second side piece, and the bottom define an internal volume (50);

[0113] The closure element includes:

[0114] A first flexible corner piece (120) extends along the longitudinal axis, wherein the first flexible corner piece includes a first inner portion (130) that engages with the first side piece inside the inner volume and a first outer portion (140) that extends from the first inner portion and is located outside the inner volume.

[0115] A repositionable pressure-sensitive adhesive (150) that peelably bonds the first outer portion directly or indirectly to the inward-facing surface of the second side sheet; and

[0116] A free flange (160) extends from the first outer portion and along at least a portion of the longitudinal axis, wherein the free flange is without the repositionable pressure-sensitive adhesive.

[0117] The first and second side sheets have more than about 80% by weight of paper.

[0118] B. The bag according to paragraph A, wherein the closure has a closure length along the longitudinal axis, wherein the free flange has a free flange length along the longitudinal axis, and the free flange length is less than about 20% of the closure length.

[0119] C. The bag according to paragraph A or B, wherein at least a portion of the free flange contrasts in color with the first outer portion.

[0120] D. The bag according to any one of paragraphs A to C, wherein the second side panel is connected to the first side panel across the bottom of the bag.

[0121] E. The bag described in any of paragraphs A through D, wherein the bag has more than about 80% by weight of paper.

[0122] F. The bag according to any one of paragraphs A to E, wherein the inward-facing surfaces of the first side panel and the inward-facing surfaces of the second side panel are coated with a polymer coating.

[0123] G. The bag according to paragraph F, wherein the polymer coating comprises at least one material selected from the group consisting of: low-density polyethylene, linear low-density polyethylene, high-density polyethylene, polypropylene, polyacrylamide, linear polyacrylamide, styrene-butadiene copolymer, and combinations thereof.

[0124] H. The bag according to any one of paragraphs A to G, wherein the first side panel has a first side panel facing outward (82) opposite to the inward-facing surface of the first side panel, and the second side panel has a second side panel facing outward (92) opposite to the inward-facing surface of the second side panel, wherein the inward-facing surfaces of the first side panel and the inward-facing surfaces of the second side panel are discontinuously coated or uncoated.

[0125] I. The bag according to any one of paragraphs A to H, wherein the repositionable pressure-sensitive adhesive comprises at least one material selected from the group consisting of: acrylate and methacrylate homopolymers or copolymers, butyl rubber-based systems, silicone, nitrile, styrene block copolymers, ethylene vinyl acetate, polyurethane, vinyl esters and amides, olefin copolymer materials, natural or synthetic rubbers, and mixtures thereof.

[0126] J. The bag according to any one of paragraphs A to I, wherein the first side panel and the second side panel each have a top edge (11) located outside the internal volume, wherein the free flange is recessed relative to the top edge.

[0127] K. The bag according to any one of paragraphs A to J, wherein the repositionable pressure-sensitive adhesive has a failure load of about 0.05 MPa to about 0.5 MPa according to ASTM D3165-07 (2014) and an average T-peel strength of about 0.01 N / mm to about 0.6 N / mm according to ASTM D903-98 (2017).

[0128] L. A bag according to any one of paragraphs A through K, wherein the bag contains a plurality of water-soluble unit dose products.

[0129] M. The bag according to any one of paragraphs A to L, wherein the repositionable pressure-sensitive adhesive has a closure height measured orthogonally to the longitudinal axis, wherein the closure height is from about 1 mm to about 50 mm.

[0130] N. The bag according to paragraph A, wherein the bag further comprises a second flexible corner piece (170) extending along the longitudinal axis, wherein the second flexible corner piece comprises a second outer portion (180) engaged outside the inner volume to the inward-facing surface of the second side piece and a second inner portion (190) extending from the second outer portion and located inside the inner volume, wherein the repositionable pressure-sensitive adhesive peelably bonds the first outer portion to the second inner portion to peelably and indirectly bond the first outer portion to the inward-facing surface of the second side piece through the second inner portion, and wherein the second inner portion has a second inner portion distal end oriented toward the inner volume.

[0131] O. The bag according to paragraph N, wherein the repositionable pressure-sensitive adhesive is on at least one surface selected from: the first outer portion and oriented toward the second inner portion, the second inner portion and oriented toward the first outer portion, and combinations thereof.

[0132] P. The bag according to paragraph N or O, wherein the first flexible corner piece and the second flexible corner piece have more than about 80% by weight of paper.

[0133] Q. Based on the bag described in any of paragraphs N through P:

[0134] The first flexible angle member and the second flexible angle member each have an outward-facing surface (220), wherein the outward-facing surfaces are oriented away from each other; wherein at least a portion of the inward-facing surface of the first side piece, the inward-facing surface of the second side piece, and each of the outward-facing surfaces is coated with or partially coated with a polymer coating (225); and

[0135] The outward-facing surface of the first flexible corner piece is joined to the inward-facing surface of the first side piece by a heat-sealing (230) of the polymer coating, and the outward-facing surface of the second flexible corner piece is joined to the inward-facing surface of the second side piece by a heat-sealing of the polymer coating.

[0136] R. A bag according to any one of paragraphs N to Q, wherein the first outer portion is peelably bonded to the second inner portion on a peel area (152) having a peel area by the repositionable pressure-sensitive adhesive, wherein the bag contains an article (2) of cumulative weight, wherein the repositionable pressure-sensitive adhesive has a failure load according to ASTM D3165-07 (2014), wherein the failure load according to ASTM D3165-07 (2014) multiplied by the peel area is about 2 to about 500 times, optionally about 5 times to about 300 times, optionally about 5 times to about 100 times the cumulative weight of the article.

[0137] S. A bag according to any one of paragraphs N to R, wherein the first outer portion is peelably bonded to the second inner portion on a peel area (152) having a peelable area by the repositionable pressure-sensitive adhesive, wherein the bag contains the cumulative weight of the article (2), wherein the peelable area and the mass of the article are approximately 125 mm apart. 2 / 100g to approximately 1250mm 2 Provided at a ratio of / 100g.

[0138] T. The bag according to any one of paragraphs N to S, wherein the repositionable pressure-sensitive adhesive has a closure height measured orthogonally to the longitudinal axis, wherein the closure height is from about 1 mm to about 50 mm.

[0139] U. A method for opening a bag as described in any one of paragraphs N to T, comprising the following steps:

[0140] Grasp the second side piece with one hand at its top edge (11), wherein the top edge is opposite to the bottom and is located outside the inner volume;

[0141] Grasp the free flange with your other hand; and

[0142] Peel the free flange and the second side piece from each other to peel the first outer portion from the second inner portion along the repositionable pressure-sensitive adhesive to open the bag; and

[0143] Optionally, the first outer portion and the second inner portion are re-bonded to each other along the repositionable pressure-sensitive adhesive to close the bag.

[0144] V. A method for opening a bag as described in any of paragraphs A through M, comprising the following steps:

[0145] Grasp the second side piece with one hand at its top edge (11), wherein the top edge is opposite to the bottom and is located outside the inner volume;

[0146] Grasp the free flange with your other hand; and

[0147] Peel the free flange from the second side panel along the repositionable pressure-sensitive adhesive to open the bag; and

[0148] Optionally, the first outer portion and the second side piece are re-bonded to each other along the repositionable pressure-sensitive adhesive to close the bag.

[0149] The dimensions and values ​​disclosed herein should not be construed as strictly limited to the precise numerical values ​​cited. Rather, unless otherwise specified, each such dimension is intended to represent the stated value and a range around which it is functionally equivalent. For example, a dimension disclosed as “40 mm” is intended to represent “approximately 40 mm”.

Claims

1. A bag (10), said bag comprising: The first side piece (20) has a pair of first side piece lateral edges (70) and a first side piece inward-facing surface (80). A second side panel (30), the second side panel being opposite to the first side panel and having an inwardly facing surface (90) of the second side panel facing the inward surface of the first side panel, wherein the second side panel is connected to the first side panel across the bottom (60) of the bag and has a pair of second side panel lateral edges (100), wherein each of the first side panel lateral edges engages with an opposing second side panel lateral edge; and A closure (40) is opposite to the bottom and extends along a longitudinal axis (L), wherein the closure peelably connects the first side piece and the second side piece, wherein the closure, a portion of the inward-facing surface of the first side piece, a portion of the inward-facing surface of the second side piece, and the bottom define an internal volume (50). The closure element includes: A first flexible corner piece (120) extends along the longitudinal axis, wherein the first flexible corner piece has more than 80% by weight of paper and includes a first inner portion (130) joined to the first side piece inside the inner volume and a first outer portion (140) extending from the first inner portion and located outside the inner volume, wherein the first outer portion is pivotable about the position of the first outer portion extending from the first inner portion; A repositionable pressure-sensitive adhesive (150) that peelably bonds the first outer portion directly or indirectly to the inward-facing surface of the second side sheet; and A free flange (160) extends from the first outer portion and along at least a portion of the longitudinal axis, wherein the free flange does not have the repositionable pressure-sensitive adhesive; The first side sheet and the second side sheet have more than 80% by weight of paper.

2. The bag according to claim 1, wherein the closure has a closure length along the longitudinal axis, wherein the free flange has a free flange length along the longitudinal axis, and the free flange length is less than 20% of the closure length.

3. The bag according to claim 1 or claim 2, wherein at least a portion of the free flange contrasts in color with the first outer portion.

4. The bag of claim 1, wherein the second side panel is connected to the first side panel across the bottom of the bag.

5. The bag according to claim 1, wherein the bag has more than 80% by weight of paper.

6. The bag according to claim 1, wherein the inward-facing surfaces of the first side panel and the inward-facing surfaces of the second side panel are coated with a polymer coating.

7. The bag of claim 1, wherein the repositionable pressure-sensitive adhesive comprises at least one material selected from the group consisting of: acrylate and methacrylate homopolymers or copolymers, butyl rubber-based systems, silicone, nitrile, styrene block copolymers, ethylene vinyl acetate, polyurethane, vinyl esters and amides, olefin copolymer materials, natural or synthetic rubbers, and mixtures thereof.

8. The bag according to claim 1, wherein the first side panel and the second side panel each have a top edge (11) located outside the inner volume, wherein the free flange is recessed relative to the top edge.

9. The bag of claim 1, wherein the repositionable pressure-sensitive adhesive has a failure load of 0.05 MPa to 0.5 MPa according to ASTM D3165-07 (2014) and an average T-peel strength of 0.01 N / mm to 0.6 N / mm according to ASTM D903-98 (2017).

10. The bag of claim 1, wherein the bag further comprises a second flexible corner piece (170) extending along the longitudinal axis, wherein the second flexible corner piece comprises a second outer portion (180) engaged outside the inner volume to the inward-facing surface of the second side piece and a second inner portion (190) extending from the second outer portion and located inside the inner volume, wherein the repositionable pressure-sensitive adhesive peelably bonds the first outer portion to the second inner portion to peelably and indirectly bond the first outer portion to the inward-facing surface of the second side piece through the second inner portion, and wherein the second inner portion has a second inner portion distal end oriented toward the inner volume.

11. The bag of claim 10, wherein the repositionable pressure-sensitive adhesive is on at least one surface selected from: the first outer portion oriented toward the second inner portion, the second inner portion oriented toward the first outer portion, and combinations thereof.

12. The bag according to claim 10 or 11, wherein the second flexible corner piece has more than 80% by weight of paper.

13. The bag according to claim 10: The first flexible angular member and the second flexible angular member each have an outward-facing surface (220), wherein the outward-facing surfaces are oriented away from each other; wherein at least a portion of the inward-facing surface of the first side piece, the inward-facing surface of the second side piece, and each of the outward-facing surfaces is coated with or partially coated with a polymer coating (225); and The outward-facing surface of the first flexible corner piece is joined to the inward-facing surface of the first side piece by a heat seal (230) of the polymer coating, and the outward-facing surface of the second flexible corner piece is joined to the inward-facing surface of the second side piece by a heat seal of the polymer coating.

14. A method for opening a bag according to any one of claims 10 to 13, the method comprising the steps of: Grasp the second side piece with one hand at its top edge (11), wherein the top edge is opposite to the bottom and is located outside the inner volume; Grasp the free flange with your other hand; as well as Peel the free flange and the second side piece from each other to peel the first outer portion from the second inner portion along the repositionable pressure-sensitive adhesive to open the bag.

15. The method of claim 14, further comprising the step of: The first outer portion and the second inner portion are re-bonded to each other along the repositionable pressure-sensitive adhesive to seal the bag.

16. A method for opening a bag according to any one of claims 1 to 9, the method comprising the steps of: Grasp the second side piece with one hand at its top edge (11), wherein the top edge is opposite to the bottom and is located outside the inner volume; Grasp the free flange with your other hand; as well as The free flange is peeled off from the second side panel along the repositionable pressure-sensitive adhesive to open the bag.

17. The method of claim 16, further comprising the step of: The first outer portion and the second side piece are re-bonded to each other along the repositionable pressure-sensitive adhesive to close the bag.

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