WO2019232603A1

WO2019232603A1 - Constructive arrangement in paper bag

Info

Publication number: WO2019232603A1
Application number: PCT/BR2019/050202
Authority: WO
Inventors: Luiz Felipe BELLATO; Helio CORRÊA JUNIOR
Original assignee: Klabin S.A.
Priority date: 2018-06-05
Filing date: 2019-06-03
Publication date: 2019-12-12
Also published as: AR120627A4; BR202018011387U2; BR202018011387Y1

Abstract

The present utility model relates to a constructive arrangement in paper bags comprising three layers separating the inside material from the external environment: an innermost paper layer (2), an intermediate plastic layer (3) and an outermost paper layer (4), which layers are fixed through an adhesive point (5); in addition to a top closure mechanism (6) comprising a deaeration window (16) located under a sheet (14) so as to create an air ducting channel (15) between the interior of the bag (1) and the external environment.

Description

" CONSTRUCTIVE ARRANGEMENT IN PAPER BAG"

TECHNICAL FIELD OF THE UTILITY MODEL

[0001] The present utility model relates to a constructive arrangement in paper bags comprising a deaeration window and an area of resistance to moisture and external contaminants for storage of granular material. More specifically, the present utility model relates to paper bags comprising three overlapped layers of distinct materials, and an aperture for the external environment containing a nano-perforated area and an air conduction channel, in addition to a detachable area of easy opening, protecting and enhancing the expiration date of the inside material and allowing easy handling.

PRIOR ART

[0002] Bulk products packages capable in support large quantities need not only ensure the safety of the product in its interior against contamination of external agents but also to interfere with the final weight of the packaged product as little as possible, since the price paid by the consumer is also related to the package.

[0003] One of the problems faced by both consumers and producers of bulk packages is the percentage of packaged air. Since, during the filling of the package, air is also added inside the package, when sealed, the package retains that air, generating weight differences and, consequently, price differences.

[0004] Paper bags are used in various applications around the world, notably for the transportation and/or storage of bulk products.

[0005] A classic presentation of paper bags used in transportation is the one that has a top aperture while the bottom remains sealed to support the inside product. Side grooves, which facilitate the folding of the paper and keep the bag collapsed until the moment of its use, are often also present.

[0006] This construction not only allows the paper bag to be easily opened to receive the product in its interior but also allows the easy insertion of that product since the bag has a fixed aperture, besides allowing the manual closure and the quick escape of the air contained inside .

[0007] The existing problem with this construction is that its easy handling also allows easy contamination or loss of the product inside. If the product to be placed inside the paper bag does not have a protective packaging, the chances of contamination or loss through the top opening are too great. This problem is of particular concern in the case of granular products, such as cement or seeds.

[0008] The second presentation of paper bags is common for bulk products where the bag has all of its apertures sealed after filling and may optionally have an aperture for the filling pipe or hose, which is also sealed after use.

[0009] The problem with this construction is that the air that is displaced during the filling of the bag remains inside after the sealing of the apertures. This air occupies regions that should be occupied by the product and generate weight differences between batches. Vacuum bag filling is a solution to this problem but generates a higher production cost due to the controlled environment.

[0010] In light of the above-mentioned problem, some solutions have been proposed and can be seen in the prior art .

[0011] WO 2015/003782 discloses a paper bag containing a top region equipped with a bag filler valve. This valve is produced using intimately bonded thermal material and support material. The valve also has an adhesive region and a recess. This recess provides a fold region, where it is possible to remove the adhesive portion during the filling step. Such a construction has a valve for contact with the external environment but does not describe improvements regarding the inner air escape or the protection from external contaminants.

[0012] US 5,493,844 discloses a container for storing bulk material, container produced with thermoplastic polyethylene layers, being moisture resistant, and containing a top region with a filling area and a ventilation area. The filling area comprises an overlay sub-area of the thermoplastic layers, which contains an inner layer containing micro-perforations and a continuous outer layer, fixed to the inner layer by the application of a coating in the form of a thermally activatable adhesive strip (hot- melt) . The proposed ventilation area contains micro perforations in the thermoplastic layer and remains open for the entire period of filling of the bag, being subsequently sealed by the application of heat. This construction, despite having a valve for contact with the external environment, is entirely made of plastic, which increases the cost, and has a closure mechanism instead of a communication mechanism.

[0013] US 2007/181459 discloses a multilayer package for porous materials, in particular, moisture sensitive materials or soluble powders. The proposed package has a top region with a filling valve, in addition to an outer layer made of impermeable material such as a plastic, an inner layer made of a permeable material such as paper, and an overlapping region of the two layers, wherein the internal and external surfaces of the outer layer are also perforated. These layers are joined on the sides of the overlapping region through a seam, solder or adhesive region, creating a ventilation channel for the rest of the package. This construction is preferably elaborated on only one side since, during the storage of the filled bags, the aperture in the overlapping region is closed by the inherent weight of the filled package. However, this solution provides a detachable area for communication with the external environment.

[0014] In light of the foregoing prior art available and the problems raised, the current utility model presents a constructive arrangement for paper bags containing the overlapping layers produced with different materials and an area of contact with the external environment, containing a nano-perforated region and a channel for conducting the air contained within the package. Such a constructive arrangement ensures the breathing of the inside material without contamination by external agents.

OBJECTIVES OF THE UTILITY MODEL

[0015] One of the objectives of the present utility model is to provide a constructive arrangement in paper bags that facilitates the escape of air contained within the bag during filling.

[0016] Another objective of the present utility model is to provide a constructive arrangement in paper bags that protects the material inside the bag from external agents contamination and moisture absorption.

[0017] A third objective of the present utility model is to provide a constructive arrangement in paper bags that is resistant and light enough to protect the material contained within the bag while facilitates transportation.

[0018] The present utility model provides a paper bag containing three layers of different materials between the inside product and external environment, where the innermost layer is made of paper, the intermediate layer is made of a plastic film with width equal to twice the face of the bag plus about 10 to 30 mm, and the outer layer is also made of paper. The top surface contains a nano-perforated paper sheet and an outer sheet bonded so as to allow the air contained with the package to be drawn to the external environment and to protect the inside material from contamination and moisture absorption. The paper bag still has sufficient strength to be handled and transported properly .

SUMMARY OF THE UTILITY MODEL

[0019] The objectives of the present utility model are achieved through a constructive arrangement for paper bags where three layers of distinct materials separate the inside material from the external environment, in addition to a communication window on the top surface of the bag.

[0020] The three layers are produced with different materials in order to protect the inside material from different contaminants, like foreign particles and moisture. The innermost and outermost layers are both made of paper, while the intermediate layer is made of a plastic film, with a width equal to twice the face of the bag plus about 10 to 30 mm.

[0021] On the top surface, the paper bag also has a communication window connecting the interior of the bag with the external environment. This window contains only one nano- perforated paper layer covered by a second paper strip bonded in such a way as to allow airflow from the inside out during the packaging process of the package.

[0022] Thus, the proposed constructive arrangement presents a paper bag containing three layers produced with distinct materials, separating the inside product from the external environment. The innermost layer is made of paper, the intermediate layer in an impermeable plastic film and the outermost layer is also made of paper, the three layers being provided with sufficient flexibility for easy handling of the bag. The top surface of the bag further comprises a communication window connecting the interior of the bag with the external environment, comprising only one nano- perforated paper layer covered by a second paper strip bonded in such a way as to allow airflow from the inside out during the process of filling the package. Such construction allows the inner air to escape to the external environment without complications at the time of filling the bag, while preventing external contaminants from coming into contact with the material inside the bag.

DESCRIPTION OF THE DRAWINGS

[0023] In the following, the present utility model is described in more detail with reference to the accompanying drawings, where:

[0024] Figure 1 is a front left top side perspective view of the paper bag, showing its three layers with its adhesive point and the channel that allows the air exchange.

[0025] Figure 2 is a schematic representation of the overlapping of the three layers of the paper bag.

[0026] Figure 3 is a side view of a section of the top closure mechanism of the paper bag, showing the overlapping flaps.

[0027] Figure 4 is a front right side perspective view of the paper bag, showing the adhesive point between the three layers and the integral parts of the top closure mechanism of the paper bag.

[0028] Figure 5 is a front right top side perspective view of the paper bag, showing the adhesive point between the layers and the operation of the integral parts of the top closure mechanism.

[0029] Figure 6 is a front right top side perspective view of the paper bag, showing the adhesive point between the layers and the top closure mechanism partially closed.

[0030] Figure 7 is a front right top side perspective view of the paper bag, showing the adhesive point between the layers and the aeration window partially assembled.

[0031] Figure 8 is a front right top side perspective view of the paper bag, showing the adhesive point between the layers and the aeration window fully assembled.

[0032] Figure 9 is a front right top side perspective view of the paper bag, showing the adhesive point between the layers and the top closure mechanism fully closed.

[0033] Figure 10 is a rear right bottom side perspective view of the paper bag, showing the integral parts of the bottom closure mechanism of the paper bag.

[0034] Figure 11 is a rear right bottom side perspective view of the paper bag, showing the operation of the integral parts of the bottom closure mechanism.

[0035] Figure 12 is a rear right bottom side perspective view of the paper bag, showing the bottom closure mechanism partially closed.

[0036] Figure 13 is a rear right bottom side perspective view of the paper bag, showing the bottom closure mechanism fully closed.

DETAILED DESCRIPTION OF UTILITY MODEL

[0037] The object of the present utility model is produced with different materials and endowed with flexibility and high durability, which allows ease of use and high maneuverability.

[0038] Referring to the above-mentioned drawings and, according to Figures 1 and 2, the present utility model consists of a paper bag (1) comprising three layers separating the inside material from the external environment: an innermost paper layer (2), an intermediate plastic layer (3) and an outermost paper layer (4) .

[0039] Figure 3 shows a side section of the integral parts of the top closure mechanism (6), while Figure 4 shows the bag (1) fully open with the adhesive point (5) (also seen in Figures 1 and 2) fixing the three layers and all the integral structures of the top closure mechanism (6) in exploded-view .

[0040] Still, according to Figure 4, initially a nano-perforated paper sheet (12), with a width equal to the larger flaps (9a and 9b), has its sides folded upwards, so that its length has a dimension equal to the distance between the shorter flaps (7 and 8) . In this context, the nano- perforated paper sheet (12) has an area equal to the upper area of the paper bag (1) . In addition, one of the shorter sides of the nano-perforated paper sheet (12) is folded downwards to generate a reinforcement point (13) of greater thickness. Similarly, a support area for the second reinforcement point (11), made of paper, also has its longer sides being folded upwardly, having a final width equal to the shorter flaps (7 and 8), and one of the shorter sides folded but downward, creating a second reinforcement point (11) having a thickness equal to the reinforcement point of the nano-perforated paper sheet (12) and joining the reinforcement point (13) .

[0041] According to Figure 5, the nano-perforated paper sheet (12) is introduced into the support area for the filling hose (10) (not visible) . In this context, the nano- perforated paper sheet (12) is located between the base of the support area for the second reinforcement point (11) (not visible) and its flaps.

[0042] According to Figures 6 and 7, the shorter top flaps (7 and 8) are folded inwardly so as to generate support to the nano-perforated paper sheet (12) . The shorter distal flap (7) has side flaps (7a and 7b) (visible in Figure 5) which will fold under the set of reinforcement points of the perforated sheet (13) (visible in Figure 4) and the second reinforcement point (11) . The shorter proximal flap (8) also has side flaps (8a and 8b) which will secure the nano- perforated paper sheet (12) in place. The assembly guarantees high resistance.

[0043] According to Figure 8, when the larger flaps (9a and 9b) are closed on the nano-perforated paper sheet (12) (not visible) and second reinforcement point (11), a deaeration window (16) is formed in accordance with a recess of said flaps, since they do not overlap. Thus, particles of the inner environment are retained in the nano-perforations of the nano-perforated paper sheet (12) (not visible), while air contained within the package, which is displaced during the filling of the bag (1), is able to exit to the external environment .

[0044] Still, according to Figures 8 and 9, an outer paper sheet (14) is partially bonded onto the deaeration window (16) . Such bonding is done in such a way that only the flaps (14a and 14b) of the outer paper sheet (14) are fixed, creating a ventilation channel (15), which conducts the air passing through the deaeration window (16) inside the bag (1) to the external environment. Therefore, the outer paper sheet (14) acts as an additional barrier against contamination of the stored material and reinforcement of the top closure of the package.

[0045] In addition, the bottom of the paper bag (1) also has a bottom closure mechanism which is different over the prior art, as shown in Figures 10 to 13.

[0046] In Figure 10, the paper bag (1) has the bottom surface highlighted and the bottom closure mechanism is seen in exploded-view.

[0047] The process of closing the bottom part of the bag (1) begins in Figure 11, where the smaller bottom flaps (17 and 18) close inwardly the bag (1) . It should be highlighted that these flaps also have side flaps (17a, 17b, 18a, and 18b) which will fold under the greater bottom flaps (19a and 19b) and provide greater and better engagement.

[0048] In Figures 11 and 12, it is possible to appreciate the closure of the greater bottom flaps (19a and 19b) , continuing the process of closing the bottom part of the bag (1) . It is also possible to realize that each of the greater bottom flaps (19a and 19b) has an extension (20), which overlaps, according to Figure 12, and are bonded.

[0049] Finally, Figure 13 shows the bag (1) completely closed, wherein a bottom detachable sheet (21) containing a handle point (22) is bonded over the larger bottom flaps (19a and 19b) and their extensions (20) also bonded. This constructive arrangement ensures good retention of the inside material.

[0050] In light of the foregoing, the present utility model presents a new arrangement for paper bags with optimum protection of the inside material from external contaminants and moisture, in addition to a closure mechanism which ensures easy filling without the use of adhesives, a efficient ventilation channel, which ensures air withdrawal from the bag during the filling step, and an easy and quick opening mechanism for the end user.

Claims

CLAIM

1. A constructive arrangement in paper bag, characterized in that it comprises three layers separating the inside material from the external environment: an innermost paper layer (2), an intermediate plastic layer (3) of size equal to at least twice the face of the paper bag (1) and an outermost paper layer (4), which layers are fixed through an adhesive point (5); in addition to a top closure mechanism (6) where the smaller top flaps (8) are folded inwardly, supporting the support set of the second reinforcement point (11) and nano-perforated paper sheet (12) with their respective reinforcement points (11 and 13), and wherein the larger top flaps (9a and 9b), when folded inwardly, form a deaeration window (16), located under a sheet (14) with its larger sides (14a and 14b) folded inwardly and bonded onto the support set of the second reinforcement point (11) and nano-perforated paper sheet (12) so as to create an air ducting channel (15); and in addition to a bottom closure mechanism, wherein the smaller bottom flaps (17 and 18) close inwardly the bag (1) and lie below the larger bottom flaps (19a and 19b) with their protuberances (20), which overlap and are bonded together, in addition to a bottom sheet (21) bonded over the larger bottom flaps (19a and 19b) and their protuberances (20) .