WO2009027989A1

WO2009027989A1 - Builder's bags

Info

Publication number: WO2009027989A1
Application number: PCT/IN2007/000474
Authority: WO
Inventors: Saurabh Kalani
Original assignee: Flexituff International Limited
Priority date: 2007-08-24
Filing date: 2007-10-10
Publication date: 2009-03-05

Abstract

A builder's bag (100) for carrying building material is disclosed. The bag (100) has side panels (102,102A) on which are stitched loops (106) which can be used both for lifting the bag by crane or by means of a fork lift truck. The loops (106) are made of shape retaining strips. Two opposite side panels (102A) are provided reinforcement strips (108).

Description

BUILDER'S BAGS

FIELD OF THE INVENTION:

This invention relates to flexible containers.

More particularly, this invention relates to bags used for storage and transportation of building materials like sand, gravel cement and the like.

INTRODUCTIONAND BACKGROUND:

Storage and transportation of bulk materials for industrial consumption i* unavoidable in the sense that various raw materials and or semi finished products required to sustain the industrial activity is never available in the immediate vicinity of the unit. This led to various types of containers and storage systems specially adapted to suit the requirements of a particular type of industry. For example, methods of transportation and storage used for iron ore from the mining area to the smelting plant will not be suitable for transportation of raw materials required for the production of chemical or pharmaceutical products.

In a manufacturing unit it is possible to build specific handling and storage facilities like conveyor belts, bucket elevators and storage silos to receive and store bulk materials as the quantum of consumption is clearly known and remains constant for a known rate of production. The situation however is very different in a building site. It is not feasible to provide permanent storage and handling facilities as the same would be of no use once the construction activities are completed and would have to be uprooted and shifted to another site, involving prohibitive cost. Also the quantum of storage of materials like sand, gravel and cement and the like vary widely through the various stages or completion of the building.

This has lead to the use of cheaper and flexible storage means and use of standard handling facilities like mobile cranes and fork-lift trucks. Builder bags are typically used for filling sand, aggregates and gravel. In some countries, typically, the U.K. these materials can not be dumped on ground and hence they are stored and transported in these bags. Each bag is typically of 1000 Kg. The use of flexible bags made of woven fabric with some reinforcement material PP/HDPE/LDPE/Metallic wires are known in the prior art.

A prior art builder bag is shown in figure 1 of the accompanying drawings. These bags are substantially square in open cross section and are provided with loops at the four top corners. The bag has a flat bottom suitably reinforced to with stand the designed load and four side walls. The loops are hooked to cranes lifting hook and used to lift and shift a loaded bag. These bags are invariably loaded on wooden or polymer pallets, as this facilitates lifting and shifting at a later stage, by using fork-lift trucks. Such bags are loaded on flatbed trucks along with pallets and are delivered to a building site where the unloading is done normally by fork-lift trucks. These pallets are expensive a:, they are provided with fork-lift tine entry access on at least two sides to facilitate easy handling and storage. The pallets are made of members having high cross sectional area to withstand storage loads and wear and tear encountered in rough and often careless handling, adding to their cost. Many of the pallets are also damaged and at times not returned to the original owner. The cost of a pallet is many times higher than the cost of a builder bag.

This led to the development of Tunnel lift bags as these bags could be transported without pallets in a truck and unloaded at the site by using standard fork-lift trucks. Tunnel lift bags were designed as seen in figure 2 of the accompanying drawings.

In case of tunnel lift bag, the bag has tunnels made of fabrics on two sides of the bag in addition to the four loops on the top corners. These loops are slung on to mobile crane hook and used for lifting where as the side tunnels are used by a fork lift truck, as a tine entry access for handling the bags.

This design eliminates the use of pallets for fork lift handling but the problem L; that the tunnel has reinforcement only at the edges and the center of the tunnel is not strong enough. This results in tearing off the tunnels when the fork lift tine is entering the tunnels as the tunnel flap is not in a fully open position and may accidentally tear off in the middle.

Another problem is that in windy conditions and or if two bags are positioned close to each other the tunnel flaps does not open out fully to permit easy entry of the fork lift tine into the tunnel requiring another workman to open the tunnel so that the fork lift driver can guide the tine into the tunnel. These bags are normally stored in two or three tier stacks and the use of additional workman not only adds to the cost of handling but also has other inherent short comings from a safety angle as the workman, has to climb up the stack to hold the flap in open position and accidents while assisting in insertion of the tine into the tunnel cannot be avoided.

OBJECTS OF THIS INVENTION:

One of the objects of this invention is to provide a flexible lift bag that does not require a pallet for storing and handling.

Yet another object of this invention is to provide a flexible lift bag that has a set of lifting loops or webbings suitable for use either with a crane or a fork lift truck.

Yet another object of this invention is to provide a flexible lift bag that has a set of loops or webbings which are easily hooked to a crane hook and to a fork lift tine.

Yet another object of this invention is to provide a flexible lift bag that can be lifted and positioned by a fork lift truck operator without the use of additional man power.

Yet another object of this invention is to provide a flexible lift bag that is simple in construction.

Yet another object of this invention is to provide a flexible lift bag that is robust. Yet another object of this invention is to provide a flexible lift bag that is easily storable when empty.

Yet another object of this invention is to provide a flexible lift bag that reduces the turn around time of a truck by improving the efficiency of loading and unloading operations.

Yet another object of this invention is to provide a flexible lift bag that circumvents the problems encountered in opening of a closed up side tunnel.

To eliminate the problems of the loop and the tunnel lift bags of the prior art a builder bag has been envisaged in accordance with this invention which is illustrated in figure 3 of the accompanying drawings.

SUMMARY OF THE INVENTION:

According to the present invention there is provided a builder bag for carrying building material said bag comprising

four side wall panels and a base panel of woven polymeric fabric, selected from polypropylene, high density polyethylene or a combination thereof, of mass in the range of 130 to 160 gsm and having strength in the range of 1300 to 2100 Newton and defining a hollow having an approximate square mouth opening; at least two fabric strips of reinforcement having strength of 2500 to 3500 Newton in the warp direction, said strips being spaced apart from each other provided on each of two opposite side panels; aid strips being approximately perpendicular to the base and running along the side panels between the edge of the side panels defining the mouth to the edge of the side panels defining the base, at least four loops made of shape retaining strips of reinforced fabric having strength in the range of 11,000 to 15,000 Newton, a portion of each of which is secured onto said fabric strips along their length in manner that in a first operative closed configuration of the loops the loops extend above the mouth to define lifting formations for raising and lowering said bag; and in a second operative open configuration the loops define tunnels through which tines of a fork lift device can be inserted for displacing said bag.

Typically the fabric of the panels has a strength of between 1400 Newton and 2100 Newton in the warp direction of the fabric and between 1300 Newton and 1900 Newton in the weft direction of the fabric.

Typically the two of the side panels and the base are integral in the form of a I ^τ and two side panels are stitched to the U to form the bag.

Alternatively the side panels and the base panels are discrete panels stitched to each other to form the bag.

Further alternatively the side panels are in the form of a tubular woven sleeve and the base panel is stitched to one end of the sleeve to form the bag.

Typically the fabric strips are integral with the fabric and are woven in the fabric of the side panels during the weaving of said fabric.

Alternatively the strips of reinforcement are stitched to the side panels. Preferably the fabric strips extend into the base panel.

Typically the fabric strips have a mass of 35 to 60 grams per meter.

Typically the loops are made of strips of polymeric fabric of width less than the width of the reinforcement strips and the strips of the loops is reinforced with strands of selected from a group of material consisting of Polypropylene, High density polyethylene, Low density polyethylene LLDPE / Linear Low Density Polyethylene, Nylon and Metallic Wires.

Typically the loops are reinforced with 40 to 100 strands of reinforcing elements of denier ranging between 2000 to 3000.

Typically the reinforcement strands are woven into the fabric of the strips forming the loops.

Alternatively the reinforcement strands are stitched above or below or both above and below the strips of the loop to provide the strips of the loop with the desired stiffness.

BRIEF DESCRIPTION OF THE DRAWINGS:

All the aspects and advantages of the invention will become apparent with the description of the preferred, non-limiting embodiment, when read together with the accompanying drawings in which:

Figure 1 is the perspective view of a loop lift bag of the prior art conventionally used in conjunction with a pallet; Figure 2 is the perspective view of a loop lift bag of the prior art provided with side tunnels suitable for fork lift truck handling with out the use of pallets;

Figure 3 is the perspective view of the builder bag in accordance to this invention;

Figure 4 is the perspective view of the builder bag of Figure 3 depicting details of a typical lifting attachment for use with a crane;

Figure 5 is the perspective view of the builder bag of Figure 3 depicting method of lifting the bag using a fork lift truck; and

Figure 6 is the perspective view of an alternative embodiment of builder bag of

Figure 3 with additional lift tunnels.

DETAILED DESCRIPTION OF THE DRAWINGS:

Referring to the accompanying drawings the loop type builder bag of the prior ail is indicated generally by the reference numeral 10 as seen in figure 1 of the accompanying drawings.

Referring to Figure 1 the builder bag 10 in accordance with the prior art is provided with four side wall panels 12, one base panel 14 and four lifting loops 16 positioned at the top four corners of the bag. The loops 16 are used for lifting or lowering the bag 10. For transporting the filled bags, the bags 10 have to be supported on pallets [not shown]. The disadvantage of the use of these pallets has already been discussed hereinabove.

Referring to Figure 2, there is shown a loop and tunnel type builder bag of an alternative prior art indicated generally by the reference numeral 50. The loop and tunnel type builder bags are provided with four side wall panels 52, one base panel 54, four lifting loops 56 positioned at the top four corners of the ba^ and two tunnels 58 are provided on two of the side walls of the bag. This bag was developed to remove the disadvantage of the use of the bags shown figure 1. These bags 50 can be transported without pallets as the tunnels 58 can be used by the tines of a fork lift truck. Although the bag 50 can be transported by a fork lift truck without the support of pallets, these bags need the additional requirement of a workman to keep the tunnels open as has been discussed also herein above.

Referring to Figure 3 the builder bag of this invention is indicated generally by the reference numeral 100.

The builder bag 100 for carrying building materials comprises four side wall panels 102 and a base panel 104 of woven polymeric fabric, selected from polypropylene, high density polyethylene or a combination thereof, of mass in the range of 130 to 160 gsm and having strength in the range of 1300 to 2100 Newton and defining a hollow 107 having an approximate square mouth opening 109; at least two fabric strips of reinforcement 108 having strength of 2500 to 3500 Newton in the warp direction, said strips being spaced apart from each other provided on each of two opposite side panels 102A; said strips 108 being approximately perpendicular to the base 104 and running along the side panels 102 A between the edge of the side panels defining the mouth 109 to the edge of the side panels defining the base 104, at least four loops 106 made of shape retaining strips of reinforced fabric having strength in the range of 11,000 to 15,000 Newton, a portion of each of which is secured onto said fabric strips 108 along their length in a manner that in a first operative closed configuration of the loops as seen in figure 4, the loops 106 extend above the mouth to define lifting formations for raising and lowering said bag 100; and in a second operative open configuration as seen in figure 5 the loops 106 define tunnels through which tines 1 12 [as particularly seen in figure 5] of a fork lift device can be inserted for displacing said bag 100.

The fabric of the panels 102 and 104 has a strength of between 1400 Newton and 2100 Newton in the warp direction of the fabric and between 1300 Newton and 1900 Newton in the weft direction of the fabric.

In one embodiment of the invention, two side panels typically 102A and the base 104 can be integral in the form of a U and the remaining two side panels are stitched to the U to form the bag 100. Alternatively, the side panels 102 and the base panel 104 are discrete panels stitched to each other to form the bag 100. Still further, the side panels 102 are in the form of a tubular woven sleeve and the base panel 104 is stitched to one end of the sleeve to form the bag 100.

Typically the fabric strips 108 are integral with the fabric and are woven in the fabric of the side panels 102A during the weaving of said fabric.

Alternatively, the strips of reinforcement 108 are stitched to the side panels 102A.

Preferably, the fabric strips 108 extend into the base panel 104.

Typically the fabric strips 108 have a mass of 35 to 60 grams per meter.

Typically the loops 106 are made of strips of polymeric fabric of width less than the width of the reinforcement strips 108 and the strips of the loops 106 is reinforced with strands selected from a group of material consisting of Polypropylene High density polyethylene, Low density polyethylene DPE / Linear Low Density Polyethylene and Metallic Wires. The loops in the operative configuration form semi-rigid triangular part length tunnels. In an operative configuration seen in figure 4 , for easy lifting of a loaded builder bag 100 a hook stand attachment 1 10 may be used in conjunction with a crane. Lifting of a loaded builder bag 100 in accordance with this invention with a fork lift truck is very easy (Refer Figure 5) as the tines 1 12 of the fork lift enter the semi-rigid triangular tunnels without any hindrance and assistance from a workman.

Preferably, the loops 106 are reinforced with 40 to 100 strands of reinforcing elements of denier ranging between 2000 to 3000.

Typically the reinforcement strands are woven into the fabric of the strips forming the loops 106.

Alternatively, the reinforcement strands are stitched above or below or both above and below the strips of the loop 106 to provide the strips of the loop 106 with the desired stiffness.

Figure 6 is an alternative embodiment of the builder bag of figure 3 provided with additional set of semi-rigid, triangular part length tunnels 1 14 formed on the side panels 102A.

Builder bag 100 of this invention with tunnel loops 106 and 1 14 is typically manufactured confirming to 80x80x98 cms size. Larger sizes can also be manufactured to suit different needs. The weight of a typical empty bag is between 1.1 to 1.5 kg., depending on the size and the fabric being used. The bag can be made in three different configurations. One configuration being two side panel and base panel in a single length of fabric with other two stitched to the side panels and the base panel to form the builder bag. This configuration is known as U plus two panel type. Alternatively it is possible to have the base panel and four separate side panel all stitched together form the bag. Third alternative is to form the bag out of tubular woven fabric.

Typically Polypropylene fabric of 86 cms, width is used. The fabric conforms to the following specifications:

Weight per sq. meter : 130 to 160 gsm.

Strength in warp direction : Should be between 1400 Newton and

2100 Newton Strength in weft direction : Should be between 1300 Newton and

1900 Newton

To attach the loop 106 to the side panels 102 A and increase the strength reinforcement strips 108 are provided as a backing for the loops. These reinforcement strips 108 typically have strength in the range of 11,000 to 15,000 Newton. These reinforcement strips 108 may be formed in the fabrics at the time of weaving, which is the preferred form of construction. Such reinforcement is typically done by increasing the strand density in the warp at the appropriate locations. Typically in the reinforcement area the density is doubled. In case such reinforcement is not done at the weaving stage the same can be stitched at the appropriate places at a later stage of manufacture.

l: Typically the fabric has two areas of reinforcement 108 woven along the length of the fabric. The width of the reinforcement area is 8 to 12 cms. The reinforcement area is normally woven at such a position where the loops 106 of the bags are stitched.

Following is a typical procedure for manufacturing the bag 100 of this invention in any of the above three configurations.

In the case of the U plus two panel design construction, fabric confirming to the above specification of 86 cms width is cut to a length of 278 cms for the U panel and two lengths of 104 cms are cut for the side panel. The edges of the fabric are hemmed on both sides to make the fabric width at 80 cms. Narrow woven fabric of 7 to 10 cms width confirming to a weight of 35 to 60 gsm per meter and strength of 11,000 to 15,000 Newton is used to form the loops 106 and 114.

Such woven fabric/loops have 60 to 100 ends of reinforcement material running along the length of the loop. The reinforcement material could be PP/HDPE / LDPE / LLDPE / Metallic Wires and the like, which is woven along the length of the loop or which could be stitched on top of the loop to make the loop stiff and retain shape.

Such woven narrow fabric loops are then cut to the size to make the loop to be stitched to the bags. The loops are cut to length measuring between 1.40 to 2 meters. The loops are then attached to the body of the bag in such a manner that the bottom leg of the loop is attached 25 cms to the body of the fabric in such a way that after attaching the complete loop, the loop extends 20 cms above the top end 109 of the bag 100. The second leg of the loop is attached on top of the first leg in such a manner that from the top of the bag 25 cms portion is unstitched, which will form the tunnel or the lifting mechanism and then the second leg is stitched for the balance of 40 cms on the top of the first leg.

Significant portion of the tunnel in its flattened form will extend beyond the edge of the bag to provide the loop formation for any cranes, hook or lifting device to lift the bag as particular seen in figure 4.

The loops are stitched by high tenacity 1300 polyester/nylon threads of 1 100 to 1500 denier having a tenacity of 60 to 90 Newton. The loops are stitched by thread by using Zuki lockstick machine or any other similar style machines.

In this manner, 2 loops are stitched onto one side panel 102 A of the body of the bag. Similarly, the other two loops are stitched onto the other side panels of the bag.

Two side panels are then attached on opposite edge of the ^ΛU' panel to form a box with chain stitch. Stitching is done by using polypropylene 1800 to 2500 denier threads. Once the box type bag is made, then the edges of the boxes are once again stitched using polypropylene thread of 2000 to 4000 denier on an overlook (Hiracle) stitching machine of Armstrong, Union Special, Orsan, New Long machines or similar machines.

In the case of the 4 Panel design, four side panels of length 104 cms are cut out of 86 cms wide fabric confirming to the specification and one piece of length of 86 cms for the bottom panel is also cut. The edges of the side panel fabric are hemmed on both sides to make the fabric width at 80 cms. Narrow woven fabric of 7 to 10 cms width with a weight of 35 to 60 gsm per meter and strength of 11 ,000 to 15,000 Newton is used to form the loops 106 and 1 14.

Such woven fabric/loops have 60 to 100 ends of reinforcement material running along the length of the loop. The reinforcement material could be PP/ HDPE / LDPE / LLDPE / Metallic Wires and the like, which could be woven along the length of the loop or which could be stitched on top of the loop to make the loop stiff and retain the shape.

The method of forming the loops and attaching the same to the bag is the same as described in the U plus two panel design. Significant portion of the tunnel in its flattened form will extend beyond the edge of the bag to provide the loop formation for any cranes, hook or in lifting device to lift the bag as particularly seen in figure 4.

Four side panels are then attached to form a box with chain stitch. Stitching is done by using polypropylene 1800 to 2500 denier threads. Once the box is made, then the edges of the boxes are once again stitched using polypropylene thread of 2000 to 4000 denier on an overlock (Hiracle) stitching machine of Armstrong, Union Special, Orsan, New Long machines or similar machines. Then bottom is attached to the box with chain stitch. Stitching is done by using polypropylene 1800 to 2500 denier thread. Then the bottom edge of the box are once again stitched using polypropylene thread of 2000 to 4000 denier on an overlock (Hiracle) stitching machine.

In the case of the tubular design, Fabric confirming to the above specification of 160 cms lay flat width is to cut in a length of 104 cms for the body fabric and c ⁿ size of 86 x 86 cms for the bottom panel. The edges of the body fabric are hemmed on one side to make the fabric length 101 cms. Narrow woven fabric of 7 to 10 cms width with a weight of 35 to 60 gsm per meter and strength of 11,000 to 15,000 Newton is used to form loops 106 and 114.

Such woven fabric/loop shall have 60 to 100 ends of reinforcement material running along the length of the loop. The reinforcement material could be PP/ HDPE / LDPE / LLDPE / Metallic Wires or any other kind of stiffness, which could be woven along the length of the loop or which could be stitched on top of the loop to make the loop stiff and retain the shape.

The loops are stitched by high tenacity 1300 polyester/nylon threads of 1100 to 1500 denier having a tenacity of 60 to 90 Newton. The loop is stitched by thread by using Zuki lockstick machine or any other similar style machines. Then bottom is attached to the body with chain stitch. Stitching is done by using polypropylene 1800 to 2500 denier threads. Then the bottom edge of the box are once again stitched using polypropylene threads of 2000 to 4000 denier on an overlook (Hiracle) stitching machine of Armstrong, Union Special, Orsan, New Long machines or similar machines.

Variant - 1

In the variant of the design, after the fabric panel is prepared, loops are stitched at the 2 edges of the panel with the chain stitching machine using 2000 denier thread. In this case, the first leg of the loop comes right to the bottom of the ba_o and the loop is attached in such a manner that a loop of 20 cms extends from the top of the bag. The second leg of the loop is stitched in such a manner that about 40 cms is unstitched from the top of the bag and the balance portion is stitched at the edge of the panel.

Variant - 2

In the second variant, there will be a loop as the original stiff loop in the centre of the bag together with the two loops stitched in the edges of the bag as explained in Variant 1. The manner of stitching of loop in the centre in variant 2 will be exactly the same in the manner as in variant- 1.

The specifications of the fabric, reinforcement materials, method of construction and dimensions of the typical builder bag of this invention are listed below:

Bag Dimension : 80 x 80 x 98 cms.

Weight : 1.20 Kg. to 1.50 Kgs. Construction : U panel + 2 Side Panel OR 4 Panel OR Tubular.

Fabric for Bag : 160 to 200 GSM

: (a) Ends /inch Warp /Weft 8 to 14 : (b) Denier Warp 1200 - 1800 Weft 1500 - 2200

: (c) Fabric Strength Warp 1500-2000 Kgf.

Weft 1300-1800 Kgf. Loops : Width 7 to 10 cms.

: Weight 40-60 gms/meter.

: Warp 60-100 ends of PP tape 1800-2200 Denier and of 60-100 ends of PP monofilament strands of 2000- 2500 Denier. Strength 1200-1400 kgf. Loop attachment : Total length 2.00-2.40 Mtrs.

: Reinforced areas 0.10 - 0.30 Mtrs

: Attachment Length 40/40 cm. to 65/65 cms.

Typical 80x80x98 cms sized builder bags of this invention was manufactured in different possible fabric and reinforcement combination and tested for braking loads under destructive test conditions. The results are tabulated below. The results clearly indicate that the builder bag rated for 1000 kg load has a minimum factor of safety of 4 and going up to 6.5

While considerable emphasis has been placed herein on the particular features of "builder bag with semi-rigid, triangular part length tunnels" and the improvisation with regards to it, it will be appreciated that various modifications can be made, and that many changes can be made in the preferred embodiment without departing from the principles of the invention. These and other modifications in the nature of the invention or the preferred embodiments will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation.

Claims

Claims:

[I] A bag for carrying building material, said bag comprising four side wall panels and a base panel of woven polymeric fabric, selected from polypropylene, high density polyethylene or a combination thereof, of mass in the range of 130 to 160 gsm and having strength in the range of 1300 to 2100 Newton and defining a hollow having an approximate square mouth opening; at least two fabric strips of reinforcement having strength of 2500 to 3500 Newton rn the waip direction, said strips being spaced apart from each other provided on each of two opposite side panels; aid strips being approximately perpendicular to the base and running along the side panels between the edge of the side panels defining the mouth to the edge of the side panels defining the base, at least four loops made of shape retaining strips of reinforced fabric having strength in the range of 11,000 to 15,000 Newton, a portion of each of which is secured onto said fabric strips along their length in manner that in a first operative closed configuration of the loops the loops extend above the mouth to define lifting formations for raising and lowering said bag; and in a second operative open configuration the loops define tunnels through which tines of a fork lift device can be inserted for displacing said bag.

[2] A bag for carrying building material as claimed in claim 1 , as claimed in claim 1 , wherein the fabric of the panels has a strength of between 1400 Newton and 2100 Newton in the warp direction of the fabric and between 1300 Newton and 1900 Newton in the weft direction of the fabric.

[3] A bag for carrying building material as claimed in claim 1, as claimed in claim 1 , wherein the two of the side panels and the base are integral in the form of a U and two side panels are stitched to the U to form the bag.

[4] A bag for carrying building material as claimed in claim 1, wherein the side panels and the base panels are discrete panels stitched to each other to form the bag.

[5] A bag for carrying building material as claimed in claim 1 , as claimed in claim 1 , wherein the side panels are in the form of a tubular woven sleeve and the base panel is stitched to one end of the sleeve to form the bag.

[6] A bag for carrying building material as claimed in claim 1, as claimed in claim any one of the preceding claims, wherein the fabric strips are integral with the fabric and are woven in the fabric of the side panels during the weaving of said fabric.

[7] A bag for carrying building material as claimed in any one of the preceding claims, wherein strips of reinforcement are stitched to the side panels.

[8] A bag for carrying building material as claimed in claim any one of the preceding claims, wherein the fabric strips extend into the base panel.

[9] A bag for carrying building material as claimed in claim any one of the preceding claims, wherein the fabric strips have a mass of 35 to 60 grams per meter.

[10] A bag for carrying building material as claimed in claim any one of the preceding claims, wherein loops are made of strips of polymeric fabric of width less than the width of the reinforcement strips and the strips of the loops is reinforced with strands of selected from a group of material consisting of Polypropylene High density polyethylene, Low density polyethylene DPE / Linear Low Density Polyethylene and Metallic Wires.

[1 1] A bag for carrying building material as claimed in claim in any one of the preceding claims, wherein loops are reinforced with 40 to 100 strands of reinforcing elements of denier ranging between 2000 to 3000.

[12] A bag for carrying building material as claimed in claim any one of the preceding claims, wherein reinforcement strands are woven into the fabric of the strips forming the loops.

[13] A bag for carrying building material as claimed in claim any one of the preceding claims, wherein the reinforcement strands are stitched above or below or both above and below the strips of the loop to provide the strips of the loop with the desired stiffness.