WO2020153910A1

WO2020153910A1 - Perforated bag for construction materials

Info

Publication number: WO2020153910A1
Application number: PCT/TH2019/000003
Authority: WO
Inventors: Nuttawat SUPHANTARIDA
Original assignee: Suphantarida Nuttawat
Priority date: 2019-01-21
Filing date: 2019-01-21
Publication date: 2020-07-30

Abstract

The present invention relates to a perforated bag for receiving construction materials, with good recyclability, in which moisture resistant, is improved while ventilation capability and mechanical strength is maintained or improved. The perforated bag for construction materials comprises: - a bag body formed by a first sheet, including: a tubular main body portion formed by securing a first end of the first sheet to the second opposite end of the first sheet; a proximal end, into which construction materials are filled, formed by using a plurality of portions of a third end of the first sheet; a distal end, opposite the proximal end, formed using a plurality of portions of the fourth end of the first sheet; wherein a cavity capable of receiving construction materials is formed by securing the tubular main body portion, the proximal end, and the distal end together: and - at least one perforation area formed by perforation vents on the first sheet comprising a second sheet attached thereon inside the bag body, where the size of the second sheet is equal to or greater than the perforation area; wherein the perforation area located on the first sheet, except on the securing area of the first end and the second end, has a total area in the range of 0.1-50% of the tubular main body portion of the bag body.

Description

PERFORATED BAG FOR CONSTRUCTION MATERIALS Technical Field

The present invention relates to a bag for construction materials, in particular, bags having a perforation area.

Background

Generally, there are many types of bags (or sacks) for receiving bulk construction materials (e.g. cement, mortar, chemicals, feeds or particulate materials) including paper-based, woven polypropylene (WPP)-based, and paper/WPP laminated bags, In order to allow efficient de-aeration of the bag during the filling process, the bag needs to be perforated. The larger the perforation area, the greater the airflow, however, the perforated bag is prone to have high moisture, especially around the perforation area. It is desirable to develop the perforated bag for receiving bulk construction materials so as to be more resistant to moisture, while maintaining or improving ventilation capability and mechanical strength.

US 2007/0181459 A 1 describes the bag aa having a venting region on the longitudinal lap seam. The bag comprises at least two layers, including an inner layer and an outer layer. The perforation is performed on the overlapping region of the outer veil of an air-impermeable material To prevent moisture build up, an air-permeable material is used for the inner layer. The choice of air-permeable inner layer material can be selected from paper, or woven and non- woven fabrics. The inner layer material can protect against moisture outside of the bag, and also prevent leakage of the filling material. The overlapping perforation area requires at least force layers of material, and the larger the perforation area the more layers will be required, increasing the cost of the bag.

US 7543708 B2 describes the polyethylene bag as having microperforation, with the range of the perforation diameter in microscale (60-100 mm). Given the small size of the perforation diameter, the bag can be filled with fine powder such as cement and gypsum. After the bag is filled with the materials, a UV-curablc resin is used to coat the perforation area, creating sufficient film strength to cover the microperforalions and maintain film integrity until it hardens. US 8790010 B2 describes the cement bag having a nonwoven fabric layer supporting the perforation area. The bag is made of laminate film comprising two layers, fused together by heat. An inner layer is formed of a film .material and an outer layer is formed of a nonwoven venal. In order to provide ventilation, the laminate has cone-shaped perforations, penetrating the film material into the nonwoven material, allowing tins nonwoven fibers to stabilize the configuration created by the perforation. the maximum perforation hole diameter is in tire range of 0.4 to 2 mm. This bag is able to hold between at least 15 to 50 kg of construction materials. Since only two layers of materials can be fused together, the bag strength is limited to select materials, resulting in limitation of the perforation density.

Given the limitations of the above-mentioned products, this invention aims to provide a perforated bag for receiving construction materials, with good recyclability, and in which moisture resistance is improved while ventilation capability and mechanical strength are maintained or improved. Brief Summary

The present invention relates to a peribrated bag for receiving construction materials with good recyclability and in which moisture resistant is improved while ventilation capability and mechanical strength is maintained or improved. The perforated bag for construction materials comprises: a bag body formed by a first sheet, including: a tubular main body portion formed by securing the first end of the first sheet to the second opposite end of the first sheet: a proximal end, into which construction materials arc filled, formed by using a plurality of portions of the third end of the first sheet; a distal end, opposite the proximal end, formed using a plurality of portions of the fourth end of the first sheet; wherein a cavity capable of receiving construction materials is formed by securing the tubular main b ody portion, the proximal end, and the distal end together; and at least one perforation area formed by perforation vents on the first sheet comprising a second sheet attached thereon inside the bog body, where the size of the second sheet is equal to or greater than the perforation area; wherein the perforation area located on the first sheet, except on the securing area of the first end and the second end, has a total area in the range of 0.1-50% of the tubular main body portion of the bag body. Brief Description of the Drawings

For a more complete understanding of the present invention, example embodiments, end their advantages, reference is made to the following description taken in conjunction with the accompanying drawings, in which like reference numbers indicate like features The following figures show perspective views of the example embodiments.

Fig. 1A is the first sheet forming the bag body, in combination with additional valve and patch sheets.

Fig. 1B is a unperformed bag made of the first sheet and the additional valve and patch sheets.

Fig. 2A is a perforated bag with one longitudinal strip of perforation area along the bag body.

Fig. 2B is an example embodiment of a perforated bag with two longitudinal strips of perforation area along the bag body.

Fig. 2C is an example embodiment of a perforated bag with one latitudinal atrip of perforation area located on the proximal end of the bag body

Fig. 3A is an example embodiment of a perforated bag with one perforation vent in a cross shape located on the proximal end of the bag body.

Fig. 3B is an example embodiment of a perforated bag with one perforation vent in a Li- shape located on the proximal end of the bag body.

Fig. 3C shows a perforation area of the second sheet, located on the distal end, inside the bag according to Figs. 3 A and 3B. Pig. 4A is the second sheet comprising two layers supporting the perforation area of the first sheet

Fig. 4B is the second sheet comprising five layers supporting the perforation area of the first sheet such that the perforation vents are partially overlaid.

Fig. 5 is the perforated bag formed by the fust sheet and the second sheet, where the second sheet is configurable to be substantially tubular in shape to form a channel.

Although similar reference numbers may be uaed to refer to similar elements in the figures for convenience, each of the various example embodiments may by considered to be distinct variations.

Detailed Description

The present invention relates to the perforated bag for receiving construction materials with good recyclability in which moisture resistant is improved while ventilation capability and mechanical strength is maintained or improved, as described in the following embodiments.

Any aspect shown herein is meant to include its application to other aspects of this invention unless stated otherwise.

Technical terms or scientific terms used herein have definitions as known to an ordinary person skilled in the art unless stated otherwise.

Any tools, equipment, methods, or chemicals named herein mean tools, equipment, methods, or chemicals being used commonly by an ordinary person skilled in the art unless expressly stated that they are tools, equipment, methods, or chemicals specific only to this invention.

Use of a singular noun or pronoun with“comprising" in claims or specification means “one" but may also refer to“one or more,"“at least one,” and“one or more than one.^"

All components and/or methods disclosed and claims in this application aim to cover embodiments from any action, performance,modification, or adjustment without any experiment that significantly differs from this invention, which would result in creation of an object with the same utility or which would be deemed substantially similar to the present embodiment according to an ordinary person skilled in the art, whether or not such variation is specifically stated iu claims. Therefore, objects that are similar or which may be substitutable for the present embodiment, including those with minor modifications or adjustments tlia! may be clearly devised by an ordinary person skilled in the art should be construed as being within the spirit, scope, and concept of invention as appeared in the appended claims.

Throughout this application, the term“about'’ means any number referenced herein that could be varied or deviated from any enor of equipment, method, or personal using said equipment or method.

Example aspects will now be described with reference to the accompanying drawings, which form a part of the present disclosure and which illustrate example embodiments which may be used. As used in the present disclosure and the appended claims, the terms "example embodiment," "exemplary embodiment," and "present embodiment" do not necessarily refer to a single embodiment, although they may, and various example embodiments may be readily combined and/or interchanged without departing from the scope or spirit of example embodiments. Furthermore, the terminology as used in the present disclosure and the appended claims is for the purpose of describing example embodiments only and is not intended to limit interpretation. In this respect, as used in the present disclosure and the appended claims, the term

"in" may include "in" and "on,” and the terms "a, " " an," and "the* may each refer to the singular and plural. Furthermore, as used in the present disclosure and the appended claims, the term "by" may also mean "from," depending on the context; the term "if may also mean "when* or "upon”, depending on the context; and the term "and/or" may refer to and encompass any and all possible combinations of one or more of the associated listed items.

It is to be understood in the present disclosure that the terms "bag," "bag for construction materials," "bag for receiving particulate materials," "bag for receiving construction materials," and/or the like may be interchangeably used to refer to bags having one or more portions that are formed using different constructs (or sheets, compositions, or materials;.

It is also to be understood in the present disclosure that the twins "material," "construction materials," "particulate material, " "bulk materials," "filling material," and/or the like may be interchangeably used to refer to construction materials in particular form to be filled into the bag. Hereafter, invention embodiments are shown without any purpose to limit any scope of the invention.

The present invention relates to the perforated bag for receiving construction materials with good recyclability and in which moisture resistant is improved while ventilation capability and mechanical strength is maintained or improved. The perforation areafs) on the bag according to this invention is not necessarily formed on the seam area because a layer supporting the perforation is made of a separate sheet than that comprising the bag body. Said supporting layer also reinforces the mechanical strength of the bag. Moreover, using the separate sheet as the supporting layer increases the variety of forms available for the perforation area because the perforations can. be concentrrated in smaller areas. The method is also more cost effective since the supporting layer is provided only in the perforated area. Further advantageous improvements and forms of the invention are cited in the dependent claims.

Jn one embodiment of the invention, the perforated bag for receiving construction materials is described. The perforated bag comprises: a bag body formed by a first sheet, including: a tubular main body portion formed by securing the first end of the first sheet to the second opposite end of the first sheet; a proximal end, into which construction materials arc filled, formed by using a plurality of portions of the third end of the first sheet; a distal end, opposite the proximal end, formed using a plurality of portions of the fourth end of the first sheet; wherein a cavity capable of receiving construction materials is formed by securing the tubular mam body portion, the proximal end, and the distal end together; and at least one perforation area formed by perforation vents on the first sheet comprising a second sheet attached thereon inside the bag body, where the size of the second sheet is equal to or greater than the perforation area; wherein the perforation area located on the first sheet, except on the securing area of the first end and the second end, has a total area in the range of .1- % of the tubular main body portion of the bag body.

The bag comprises at least two sheets: a first sheet and a second sheet. A tubular bag body having a cavity capable of receiving construction materials is formed by the first sheet. The first sheet is a rectangular sheet having four ends. To form the tubular main body portion, a first end of the first sheet is secured with a second end of the first sheet. When the tubular main body is formed, the bag body comprises a proximal end and a distal end. The proximal end of the bag body, iinto which construction materials are filled, is formed by using a plurality of portions of the third end of the first sheet. The distal end of the bag body, opposite to the proximal end, is formed using a plurality of portions of a fourth end of the first sheet Together, the cavity capable of receiving the construction materials is formed by the tubular main body portion, the proximal end, and the distal end together. As it is an objective of the present invention to maintain or improve ventilation capability of the bag, at least one perforation area Ls formed by perforation vents on the first sheet. To prevent leakage and enhance the mechanical strength of the bag, a second sheet, of a size equal to or greater than the perforation area, Ls attached inside the bag body. The perforation areas are located on the first sheet, except on the scam or securing area of the first end and the second end. The total perforation area has a range of 0.1-50% of the tubular main body portion of the bag body.

In an exemplary embodiment, the perforated bag for receiving construction materials is described. The bag body is formed by a first sheet having three portions, including a tubular main body portion, a proximal end and, a distal end. The tubular main body portion is formed by securing a first end of the first sheet to the second opposite end of the first sheet. The proximal end, into which construction materials arc filled, is formed by using a plurality of portions of the third end of the first sheet. The distal end, opposite the proximal end, is formed using a plurality of portions, of the fourth end of the first sheet. The bag has a cavity capable of receiving construction materials, which is formed by securing the tubular main body portion, the proximal end, and the distal cud together.

In another exemplary embodiment, the perforated bag for receiving construction materials is described. The first sheet of the bag is a single ply sheet. The material of foe first sheet may be selected from woven polypropylene (PP), Kraft paper, woven polyethylene (PH), polyethylene terephthalale (PET), or bi-oriented polypropylene (BOPP) film. In another exemplary embodiment, the density of perforation in the perforation area is in a range of I to 500 vents/cm². Preferably, the density of perforation is in the range of 60 to 100 vents/cm².

In another exemplary embodiment the perforation area of the first sheet comprises at least one longitudinal strip along the bag body.

In another exemplary embodiment, the perforation area of the first sheet comprises at least one latitudinal strip across the bag body.

In another exemplary embodiment, the perforation area of the first sheet is located on the proximal end of the bag body.

In another exemplary embodiment, the perforation vents have a geometric shape. The geometric shape of the perforation vents may be selected from a circle, triangle, square, pentagon, hexagon, cross, star, balf circle, C-shapc, V -shape or U-shape, linear slit, or multiple shapes thereof.

In a preferred exemplary embodiment, the perforation vents have a circle shape in the diameter range of 1 mm to 5 cm, and more preferably 1 mm to 1 mm.

In another preferred exemplary embodiment, the perforation vents arc linear slits, tiach slit length is in the range of 1 to 10 cm, and more preferably 1 to 3 cm.

In another preferred exemplary embodiment, the distance between each slit is in the range of 3 mm to 14 cm, and more preferably 5 to 10 mm.

In another exemplary embodiment, the perforation vents have a cross shape, C-shapc, V- shape or U-shape. Preferably, the area of perforation vents are in the range of 1 to 225 cm², and more preferably 9 to 100 cm².

In another exemplary embodiment, the second sheet is removable from the first sheet

In another exemplary embodiment, the second sheet comprises 1 tt 5 layers.

In another exemplary embodiment, the second sheet is laminated. In a preferred exemplary embodiment, at least one layer of the .second sheet is perforated. More preferably, the perforation vents of each layer of the second sheet may be partially overlaid, and even more preferably, the perforation vents of the first sheet and the second sheet are partially overlaid.

In another preferred exemplary embodilment, if the perforation area is located on the proximal end of the bag body, the second sheet which has a greater size than the first sheet is perforated on the distal end of the bag body.

In another exemplary embodiment, a material of the second sheet may he selected from coaled or uncoated woven polypropylene (PP), nonwoven PP, perforated Kraft paper, air- permeable Kraft paper, coated or uncoated woven polyethylene (PE) film, nonwoven PE, polyethylene terepbthalate (PET) film, metalized polyethylene lerephthalate (M-RET), metalized bi-oriented polypropylene (M-BOPP). Preferably, the second sheet made of two layers of a perforated high-densily PE (HDPB) and a hydrophobic spanbond non- woven polypropylene fabric. More preferably, the second sheer is made of at least one layer of M-PET and at least one layer of M-BOPP. Most preferably, the material of the second sheet is selected from a laminated woven PP with M-PET or a laminated woven PP with M-BOPP.

In another exemplary embodiment, the second sheet comprises a single-ply layer forming a tubular shape by securing a first end and second end of the second sheet.

In another preferred exemplary embodiment, the tubular-shaped second sheet comprises at least two longitudinal perforated strips attached to the first sheet, wherein at least one longitudinal perforated strip of the second sheet and the perforation area of the first sheet are partially overlaid.

In another exemplary embodiment, the bag comprises a valve section, formed by a third sheet secured to tire proximal end of the bag body in order to enable construction materials to be received into the cavity, wherein the valve section includes a top wall and a bottom wall formed between folded portions of the proximal end of the bag body.

In any exemplary embodiment, the bag comprises a patch section formed by a fourth sheet secured to the proximal end of the bag body, the distal end of the bag body, or both. These example embodiments will now be described below with reference to the accompanying drawings, which form a part of the present disclosure.

Fig. 1A shows the perspective views of the first sheet 100 forming the bag body. The bag body, having a cavity capable of receiving construction materials, is formed by the first sheet 100, where the tubular main body portion 130 to formed. The first sheet 100 is a rectangular sheet having four ends. To form the tubular main body portion 130, a first end of the first sheet 101 is secured with a second end of the first sheet 102. As the tubular main body 130 is formed, the bag body also includes a proximal end 110 and a distal end 120. The proximal end 110 is where a construction materials are filled. By using a plurality of portions of a third end of the first sheet 103, the proximal end of the bag body 1 10 is formed. The distal end 120, opposite to the proximal end 110, is formed using a plurality of portions of a fourth end of the first sheet 104. Together, the cavity capable of receiving the construction materials to formed by the tabular main body portion 130, the proximal end 110, and the distal end 120. To facilitate the material - filling process, the bag may further comprise a valve section, formed by a third sheet 300 secured to the proximal end of lire bag body in order to enable construction materials to be received into the cavity. The valve section, which forms a channel through which the construction materials are filled via a nozzle, includes a top wall and a bottom wall funned between folded portions of the proximal end of the bag body. he valve section is configurable to be substantially tubular in shape to form the channel between the top and bottom walls, and configurable to be in a folded position such that the top wall is in contact with the bottom wall. To be more secure to the proximal end and/or the distal end of the bag body, the bag according to the present invention further comprises a patch section formed by a fourth sheet 401 secured to the proximal end of the bag body, a fourth sheet 402 secured to the distal end of the bag body, or both. When the construction materials are filled, the proximal end 110 is closed by forming a plurality of the portion as showed in Fig. 1B.

As it to an objective of the present invention to maintain or improve ventilation capability of the bog, at least one perforation area is formed by perforation vents on the first sheet. The perforation area is on at least one side of the hag body. Unlike other existing methods, where the whole bag must be covered with perforations, in the present invention the perforation area docs not need to cover the whole bag body, only enough so as in achieve the objective of releasing pressure during the filling process. The perforation area can be in various forms. Fig. 2A shows perspective views of a perforated bag with one longitudinal strip of perforation area 140 along the bag body. To prevent leakage and enhance the mechanical strength of the bag, the perforation area is attached by a second sheet 200 covering the perforation area inside the bag body. The perforation area 140 has a total area in the range of 0.1 -50% of the tubular main body portion of the bag body. Pig. 2B shows the perforated bag with two longitudinal strips of perforation area 140 along the bag body, supported by the second sheet 200 inside of the bag body. While the longitudinal strip of perforation area is able to ventilate the air throughout the filling process, the ventilation efficiency is gradually reduced as the filling material blocks the perforation vents. Fig. 2C shows the perforated bag with one latitudinal atrip of perforation area located on the proximal end of the bag body, supported by the second sheet 200 inside of the bag body. The perforation area located on like proximal end provides high ventilation efficiency during the filling process because turbulent flow will normally be high the proximal end. Thus, having the perforation area on the proximal end is an effective means of ventilation.

To better prevent material leakage, the perforation vents of the first sheet and the second sheet can be overlaid in different areas of the bag body. Fig. 3 shows a bag with one large perforation vent on the first sheet 100 in a cross shape (Fig. 3A), or in a C shape (Fig. 3B), located on the proximal end of the bag body. The bag is supported by a perforated second sheet 206, where the perforation area of the second sheet 140 is made on the distal end, except for the perforation area of the first sheet. Advantages of this example embodiment of the invention include easier removal by the user of the second sheet inside, allowing the perforation to be used as a way for material pouring, and easier recyclability of the second sheet material. Overlaying the perforation areas of the first sheet and the second sheet ensures effective ventilation while maintaining moisture protection. This example embodiment of the invention also effectively prevents leakage of the construction materials, therefore, the perforation vent of the first sheet can be a single large hole, resulting in smaller total perforation area.

The higher the density of perforations on the bag body, the weaker the bag's overall mechanical strength. However, when increasing perforation density to increase the ventilation opacity, additional layers of the second sheet can be used to offset the loss of mechanical strength and moisture protection. Fig. 4A shows a perspective view of two layers of the second sheet supporting the perforation area of the first sheet. the hydrophobic spunbond non-woven polypropylene fabric 201 and the perforated HDPE fabric 202 cover the perforated first sheet 100 from inside of the bag body. This bag provides good moisture protection at a reasonable coat. Fig. 4B shows five layers of the perforated M-PET fabric 203 and the perforated M-BOPP fabric 204 supporting the perforated first sheet, in a partially overlaid manner This bag is excellent for moisture protection.

Fig. 5 shows a perspective view of a perforated bag formed by the first sheet 100 and the second sheet 205. The bag according to this figure is configurable to be substantially tubular in shape to form a channel between the first awl second sheets. The second sheet 205 is perforated and secured to the first sheet 100, covering the perforated area of the first sheet 140. The second sheet 205 is secured to the first sheet 100 by spot adhesive 500, such that the perforation area of the second sheet is overlaid with the perforation area of the first sheet 140. In this embodiment, the air is able to ventilate via the tubular-shaped second sheet during the material filling process, preventing leakage of materials. The tubular form of the second sheet provides the large perforation area, and also provides the closing feature as the overlaid perforation vents would be substantially blocked by construction materials.

The following sections summarize some of the important characteristics of the preferred exemplary embodiments.

The second sheet made of a coated or uncoated woven PP provides good strength support and recyclability at an acceptable cost

The second sheet made of a perforated Kraft paper provides a low cost.

The second sheet made of a breathable Kraft paper provides moderate moisture protection and strength support at an acceptable cost.

The second sheet made of a PE film provides moderate moisture protection, a nice appearance, and recyclability at a low cost.

The second sheet marie of a RET film provides good moisture protection, a moderately good appearance, and recyclability at a low cost

The second sheet made of a nonwoven fabric provides good recyclability and a good appearance with moderate moisture protection and strength support at an acceptable cost.

While various embodiments in accordance with the disclosed principles have been described above, it should be understood that they have been presented by way of example only, and are not limiting Thus, the breadth and scope of the example embodiments described in the present disclosure should not be limited by any of the above-described exemplary embodiments, but should be defined only in accordance with the claims and their equivalents issuing from this disclosure. Furthermore, the above advantages and features provided in the described embodiments shall not limit the application of such issued claims to processes and structures accomplishing any or all of the above advantages.

For example, "assembly," "apparatus," "portion," "segment," "member," "body," "section," or other similar terms should generally be construed broadly to include one part or more than one part attached or connected together.

Various terms used herein have special meanings within the present technical field.

Whether a particular term should be construed as a "term of art" depends on the context in which that term is used. For example, "connect," "connected," "connecting," "connectable," "attach," "attached," "attaching," "attachable,^** "secure," "secured," "securing," "securablc," "lock," "locked," "locking," "lockable," "in communication with," "communicating with," "associated with," "associating with," or other similar terms should generally be construed broadly to include situations where attachments and connections are direct between referenced elements, or through one or more intermediaries between the referenced elements. As another example, "un-connect," "un-connected ," "un-connecting,” "un-connectable," "un-attach," "un- attached," "un-attaching," "un-attachable," "un-secure," "un-sccured," "un-securing," "un- sccurable," "unlock," "unlocked," "unlocking," "unlockable," or other similar terms should generally be construed broadly to include situations where separation, removal, and detachment arc direct between referenced elements, or from one or more intermediaries between the referenced elements. These and other terms are to be construed in light of the context in which they are used in the present disclosure and as one of ordinary skill in the art would understand those terms in the disclosed context. The above definitions arc not exclusive of other meanings that might be imported to those terms based on Use disclosed context

Words of comparison, measurement, and timing such as "at the time," "equivalent," "during," "complete,* and the like should be understood to mean "substantially al the time," "substantially equivalent," "substantially during," "substantially complete," etc., where "substantially" means that such comparisons, measurements, and timings are practicable to accomplish the implicitly or expressly stated desired result

Claims

1. A perforated bag for construction materials comprises:

a bag body formed by a first sheet, including: a tubular main body portion formed by securing the first end of (he first sheet to the second opposite end of the first sheet; a proximal end, into which construction materials are filled, funned by using a plurality of portions of the third end of the first sheet; a distal end, opposite the proximal end, formed using a plurality of portions of the fourth end of the first sheet; wherein a cavity capable of receiving construction materials is formed by securing the tabular main body portion, the proximal end, and the distal end together, and at least one perforation area formed by perforation vents on the first sheet comprising a second sheet attached thereon inside the bag body, where the size of the second sheet is equal to or greater than the perforation area; wherein the perforation area located on the first sheet, except on the securing area of the first end and the second end, has a total area in the range of 0.1 50% of the tubular main body portion of the bag body.

2. The perforated bag according to Claim 1 , wherein the first sheet is a single ply sheet.

3. The perforated bag according to Claim 2, wherein a material of the first sheet is selected from woven polypropylene (PP), Kraft paper, woven polyethylene (PE), polyethylene terephthalate (PET), or bi -oriented polypropylene (BOPP) film.

4, The perforated bog according to Claim l, wherein the density of perforation in the perforation area is in the range of 1 to 500 vents/an''.

5. The perforated bog according to Claim 4, wherein the density of perforation in the perforation area is in the range of 60 to 100 vents/cm².

6. The perforated bag according to Claim 1 , wherein the perforation area comprises at least one longitudinal strip along the bag body

7. The perforated bag according to Claim 1 , wherein the perforation area comprises at least one latitudinal strip across the bag body.

8. The perforated bag according to Claim 1, wherein the perforation area is located on the proximal end of the bag body.

9. The perforated bag according to Claim 1, wherein the perforation vents have a geometric shape.

10. The perforated bag according to Claim 9, wherein the geometric shape of the perforation vents is a circle, triangle, square, pentagon, hexagon, cross, star, half circle, C-shape, V- shape or U-shape, linear slit, or multiple shapes thereof.

11. The perforated bag according to Claim 10 wherein the perforation vents have a circle shape.

12. The perforated bag according to Claim 11 , wherein the diameter of the perforation vems is in the range of 1 mm to 5 cm.

13. The perforated bag according to Claim 12, wherein the diameter of lire perforation vems is in the range of l mm to 1 mm.

14. The perforated bag according to Claim 9, wherein the perforation vents are linear slits.

15. ITie perforated bag according to Claim 14, wherein each slits length is in the range of l to 10 cm.

16. The perforated bag according to Claim 15, wherein each slits length is in the range of 1 to 3 cm.

17. The perforated bag according to any of Claims 14 to 16, wherein the distance between each slit is in the range of 3 mm to 14 cm.

18. The perforated bag according to Claim 17, wherein the distance between each slit is in the range of 5 to 10 mm.

19. The perforated bag according to Claim 9, wherein the perforation vents have a cross shape, C-shape, V -shape or U-shape.

20. The perforated bag according to Claim 1.9, wherein the area of the perforation vents are in the range of 1 to 225 cm².

21. The perforated bag according to Claim 20, wherein the area of the perforation vents are in the range of 9 to 100 cm*.

22. The perforated bag according to Claim 1 , wherein the second sheet is removable from the first sheet.

23. The perforated bag according to Claim 1 , wherein the second sheet comprises I to 5 layers.

24. The perforated bag according to Claim 23, wherein the second sheet is a laminated sheet.

25. The perforated bag according to Claim 23 or 24, wherein at least one layer of the second sheet is perforated.

26. The perforated bag according to Claim 25, wherein the perforation vents of each layer of the second sheet are partially overlaid.

27. The perforated bag according to Claim 26, wherein the perforation vents of the first sheet and the second sheet arc partially overlaid.

28. The perforated bag according to Claim 25, wherein if the perforation area is located on the proximal end of the bag body, the second sheet which has a greater size than the first sheet is perforated on the distal end of the bag body.

29. The perforated bag according to Claim 1 , wherein a material of the second sheet is selected from coated or uncoated woven polypropylene (PP), nonwuven PP, perforated Kraft paper, air-permeable Kraft paper, coaled or uncoated woven polyethylene (PE) film, nonwoven PE, polyethylene terephthalate (PET) film, metalized polyethylene lercphtbalate (M-REGT), and/or metalized bi-oriented polypropylene (M-BOPP) .

30. The perforated bag according to Claim 29, wherein the material of the second sheet comprises at least one layer of perforated PE and at least one layer of hydrophobic spuribond non· woven polypropylene fabric.

31. The perforated bag according to Claim 29, wherein the material of the second sheet comprises at least one layer of M-PET and at least one layer of M-BOPP.

32. The perforated bag according to Claim 29, wherein the material of the second sheet is selected from a laminate of the woven PP with M-PET or a laminate of the woven PP with M-BOPP.

33. Tire perforated bag according to Claim 1 , wherein the second sheet comprises a single layer forming a tubular shape by securing the first end and the second end of the second sheet.

34. The perforated bag according to Claim 33, wherein the tubular-shaped second sheet comprises at least two longitudinal perforated strips attached to the first sheet, wherein at least one longitudinal perforated ship of the second sheet and the perforation area of the first sheet are partially overlaid.

35. The perforated bag according to Claim 1, wherein the bag comprises a valve section, formed by a third sheet secured to the proximal end of the hag body in order to enable construction materials to be received into the cavity, wherein the valve section includes a top wall and a bottom wall formed between folded portions of the proximal end of the bag body.

36. The perforated bag according to Claim 1, wherein the bag comprises a patch section formed by a fourth sheett secured to the proximal end of the bag body, the distal end of the bag body, or both.