WO2019232602A1

WO2019232602A1 - Constructive arrangement in paper bag

Info

Publication number: WO2019232602A1
Application number: PCT/BR2019/050201
Authority: WO
Inventors: Helio CORRÊA JUNIOR; Luiz Felipe BELLATO; Gustavo ESMÉRIO DA SILVA
Original assignee: Klabin S.A.
Priority date: 2018-06-05
Filing date: 2019-06-03
Publication date: 2019-12-12
Also published as: AR115748A4; BR202018011357U2

Abstract

The present disclosure relates to a constructive arrangement in paper bags comprising three layers separating the inside material from the external environment: an innermost paper layer (2) containing nano- perforations (6) and a laminated region (5) made of impermeable material absent from any perforation; an intermediate plastic layer (3) without nano-perforations (7) having a narrower side, creating a deaeration window (7a); and an outermost paper layer (4) also with nano-perforations, but in a delimited area (8); which layers are fixed through adhesive points (18).

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 protection from external contaminants and moisture, for storage of granular material. More specifically, it relates to paper bags comprising three layers of distinct materials, overlapping each other and nano-perforated, protecting and enhancing the expiration date of the inside material.

PRIOR ART

[0002] The choice of product package influences the health of the consumer. Bulk products are sold in packages with less concern about contamination and can be opened at any time for fractional sale. The poor conservation of the products inside these packages increases the risks of biological and chemical contamination, such as the proliferation of bacteria, viruses, and toxins.

[0003] Paper bags are used in various applications around the world, notably for the transportation and/or storage of products.

[0004] 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 product inside. Side grooves, which facilitate the folding of the paper and keep the bag collapsed until the moment of its use, are often also present.

[0005] 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.

[0006] 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 aperture are too great. This problem is of particular concern in the case of granular products, such as cement or seeds.

[0007] 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.

[0008] The problem with this construction is that during its opening, the paper fibers that are released, during the breaking-seal process or bag damage process, end up contaminating the product.

[0009] In light of the above-mentioned problem, some solutions have been proposed and can be seen in the prior art .

[0010] WO 2006/092335 discloses a paper bag containing an inner film and used for the bagging of bulk materials in the form of powder, such as cement, granules, animal feed, among others. The bag has a top filling region, an entire intermediate region composed of an inner paper layer, an outer paper layer and, therebetween, a plastic barrier. Such a barrier comprises an adhesive line connecting the inner paper layer to the outer paper layer, in addition to connecting the top region and the base region of the bag, so as to allow the air contained within to escape during the filling. Such a construct is brittle against moisture, since the paper has low water resistance, increasing the chances of contamination.

[0011] US 2007/248291 discloses a ventilated plastic bag for storage of powdered material. The bag contains a plurality of overlapping layers which form a flexible wall on one side of the bag. This wall further contains a first layer with a ventilation system containing several spaced perforations, and the last layer, overlapped on the ventilation layer, acting as a filter to retain any particles of the granular material. This construction, despite having a plastic barrier and the ability to use a filter of non- hygroscopic material, has a micrometric level retention system. Such retention invariably captures moisture in the air, increasing bag saturation and, consequently, increases the chances of contamination.

[0012] US 2007/181459 describes 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 construction provides a solution to the moisture problem only for already full bags, not considering the fact that stored bags can capture moisture .

[0013] 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 of nano-perforated layers and produced with different materials. Such a constructive arrangement ensures the breathing of the inside material without contamination by moisture or other external agents, which are retained in the perforated and/or laminated areas present in the three layers that separate the inside and the outside of the package .

OBJECTIVES OF THE UTILITY MODEL

[0014] One of the objectives of the present utility model is to provide a constructive arrangement in paper bags that protects the material inside the bag from external contaminants .

[0015] Another objective of the present utility model is to provide a constructive arrangement in paper bags which protects the material inside the bag from moisture.

[0016] A third objective of the present utility model is to provide a constructive arrangement in paper bags that protects the material inside the bag while facilitating the filling and transportation of the bag.

[0017] The present utility model presents a paper bag containing three layers between the inside material and the external environment, where the innermost layer is nano- perforated and made of paper, containing a laminated area of impermeable material such as plastic, and not perforated; the intermediate layer is entirely made of impermeable material and contains a deaeration window over the laminated area of the innermost layer; and the outermost layer is also made of paper and contains a delimited nano-perforated area located above the window of the intermediate layer. Such an arrangement protects the bag from external agents and moisture, in addition to providing good deaeration. The paper bag is still strong enough to be handled properly and contains a top region designed for easy filling.

SUMMARY OF THE UTILITY MODEL

[0018] 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.

[0019] These layers are made of paper with a plastic laminate area in the innermost layer; plastic in the intermediate layer, and, again, paper in the outermost layer.

[0020] Two of the three layers separating the material inside the bag from the external environment contain nano-perforations. The regions containing the perforations are not exactly the same so that the holes are not precisely overlapped. This enables the creation of airflow while increasing the chance of particle retention by one of the three layers.

[0021] The proposed constructive arrangement thus presents a paper bag containing three layers made of distinct materials, separating the inside product from the external environment. The innermost paper layer contains an area with an impermeable plastic, the intermediate layer is entirely made of plastic and the outermost layer is also made of paper, the three overlapping layers being provided with sufficient flexibility for easy handling of the bag. Two of the three layers also contain not precisely overlapping nano- perforated regions in order to allow good airflow and high retention of internal particles. The impermeable regions can still retain moisture, keeping the inside material free of contaminants and moisture absorption.

DESCRIPTION OF THE DRAWINGS

[0022] In the following, the present utility model is described in more detail with reference to the accompanying drawings, where:

[0023] Figure 1 is a front left top side perspective view of the paper bag, showing its three layers.

[0024] Figure 2 is a schematic representation of the overlapping of the three layers of the paper bag.

[0025] Figure 3 is a side view of a section of the top closure mechanism of the paper bag, showing the overlapping flaps.

[0026] Figure 4 is a front right top side perspective view of the paper bag, showing the nano-perforated area of the outermost layer, as well as the adhesive points between the layers and the integral parts of the top closure mechanism of the paper bag.

[0027] Figure 5 is a front right top side perspective view of the paper bag, showing the nano-perforated area of the outermost layer, as well as the adhesive points between the layers and the operation of the integral parts of the top closure mechanism.

[0028] Figure 6 is a front right top side perspective view of the paper bag, showing the nano-perforated area of the outermost layer, as well as the adhesive points between the layers and the top closure mechanism partially closed.

[0029] Figure 7 is a front right top side perspective view of the paper bag, showing the nano-perforated area of the outermost layer, as well as the adhesive points between the layers and the top closure mechanism fully closed.

[0030] Figure 8 is a rear right top side perspective view of the paper bag, showing the top closure mechanism fully closed.

DETAILED DESCRIPTION OF UTILITY MODEL

[0031] 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.

[0032] Referring to the above-mentioned drawings and according to Figure 1, the present utility model is 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 ) .

[0033] According to Figures 1 and 2, the innermost layer (2) of the paper bag (1) contains a laminated region (5) made of impermeable material such as plastic, and absent of any perforation. The entire area of the inner layer without lamination has nano-perforations (2) . The intermediate layer (3) does not contain nano-perforations (7), the film is narrower on one side, forming a deaeration window (7a) located immediately above the laminated region (5) of the innermost layer (2) . Finally, the outermost layer (4) has a region containing nano-perforations (8), also located on the deaeration window (7a) of the intermediate layer (3) and on the laminated area (5) of the innermost layer (2) . The nano-perforations (6, 7 and 8) located in these layers are not precisely overlapped, so as to allow airflow and good filtering of particles. The laminate area (5) and the intermediate layer (3) made of plastic maintain control of the moisture inside the bag (1) . Finally, the three layers remain attached due to the adhesive points (18), avoiding that the displacement of the bag moves too much the layers (2, 3 and 4) .

[0034] Figure 3 shows a side section of the integral parts of the top closure mechanism (9), while Figure 4 shows the bag (1) fully opened with the nano-perforated area (8) and the adhesive points (18) that fix the three layers. Initially, the smaller top flaps (11 and 12) are folded inwardly so as to generate support of the filling nozzle holder (13) . This holder has two folds (14a and 14b) upwards, creating a flow channel.

[0035] According to Figure 5, one of the larger top flaps (10a) is folded so that it is above one of the folds (14a) of the filling nozzle holder (13), and also above the second fold (14b) . This creates an extremely efficient fastening mechanism without the use of chemical adhesives inside the paper folds (14a and 14b) of the filling nozzle holder (13) . It should be highlighted that the filling nozzle holder (13) does not have the same size as the larger top flaps (10a and 10b) in order to allow a good flow of the nozzle material into the bag.

[0036] It is possible to visualize, in Figure 6, the larger top flap (10b) overlapping the assembly, as well as the folds (14a and 14b) of the filling nozzle holder (13) under the flap (10b) creating a flow channel into the bag. A sheet (15) is overlapped on the whole assembly and fixed with adhesive to the flaps (10a and 10b) .

[0037] Finally, it is possible to see the fold sites of the bag (1) in Figures 7 and 8, which facilitate handling and storage. It is still possible to see the bag (1) completely closed, wherein the only structures shown are the folds (14a and 14b) of the filling nozzle holder (13), whereby the bag will be filled, and the overlapped sheet (15) .

[0038] In light of the foregoing, the present utility model provides a new arrangement for paper bags with optimum protection of the inside material from external contaminants and moisture, as well as a closure mechanism that ensures an easy filling without the use of adhesives.

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) containing nano-perforations (6) and a laminated region (5) made of impermeable material and absent from any perforation; an intermediate plastic layer (3) without nano-perforations (7) having a narrower side, creating a deaeration window (7a) located immediately above the laminated region (5) of the innermost layer (2); and an outermost paper layer (4) also containing nano-perforations (8), these being located only on the deaeration window (7a) of the intermediate layer (3) and on the laminated area (5) of the innermost layer (2); which layers are fixed through adhesive points (18); as well as an top closure mechanism where the smaller top flaps (11 and 12) are folded inwardly, holding the filling nozzle holder (13) with its two folds (14a and 14b) outwardly, wherein one of the larger top flaps (10a) is folded so as to lie over the folds (14a and 14b) of the filling nozzle holder (13), and under an overlapped sheet (15), attached to the whole assembly with an adhesive.