Inner liner for container bag

Abstract

The present invention relates to a container bag equipped with an inner liner that maintains its rectangular shape and functions to stand upright, made of a material capable of waterproofing, for stacking a large number of container bags in a narrow space. In particular, the invention relates to an inner liner of a container bag that minimizes shrinkage deformation or failure of the sealing part during thermal bonding between the side wall of the inner liner and the reinforcing material, and improves tensile strength to minimize the phenomenon of noise caused by the load of contents.

Description

Technology Field

[0001] The present invention relates to a container bag equipped with an inner liner that maintains its rectangular shape and functions to stand upright, made of a material capable of waterproofing, for stacking a large number of container bags in a narrow space. In particular, the invention relates to an inner liner of a container bag that minimizes shrinkage deformation or failure of the sealing part during thermal bonding between the side wall of the inner liner and the reinforcing material, and improves tensile strength to minimize the phenomenon of noise caused by the load of contents. Background Technology

[0002] Generally, container bags are primarily used when transporting large quantities of chemical raw materials such as resin, powdered materials such as cement, or granular materials such as grains by land or sea.

[0003] An example of such a container bag is disclosed in Korean Patent Registration No. 10-2006704. This is provided with a main body (10) (outer bag) woven from a fiber material or a synthetic resin material to maintain the shape of the container bag while maintaining strength, and an inner liner (20) (inner bag) formed to fit with the inner surface of the main body (10), and the inner liner (20) is inserted into the main body (10) for use.

[0004] Meanwhile, the inner liner (20) can be separated from the main body (10), and contents are stored in the inner liner (20).

[0005] Looking at the shape configuration of the above container bag, a bag body (10) is formed, and an upper surface (11) is formed on the upper part of the bag body (10), and a lower surface (13) is formed on the lower part of the body (10), and these upper surface (11) and lower surface (13) are each open.

[0006] And, a carrying strap (17) is fitted around the upper circumference of the above-mentioned bag body (10).

[0007] In addition, the inner liner (20) has a shape with the upper and lower ends open, similar to the main body (10).

[0008] Since the reinforcing material (30) is joined between the sides (21) of the inner liner (20), the length between the joints (31) joined to the sides (21) does not increase beyond the elongation due to the elasticity of the material forming the reinforcing material (30), thereby limiting the side (21) from swelling outward due to the load of the bulk cargo by supporting the tensile force (arrow F) in the width direction of the reinforcing material (30).

[0009] By supporting the load of such bulk cargo with the reinforcing material (30), the phenomenon of the inner liner (20) and the side (12, 21) of the main body (10) swelling outward is suppressed, so that the container bag maintains an overall rectangular shape.

[0011] However, if both the inner liner (20) and the reinforcing material (30) are made of low-density polyethylene (PE) with a density of 0.92 g / cm³ or less, the sealing portion between the side (21) of the inner liner (20) and the reinforcing material (30) undergoes severe shrinkage, deformation, and fracture, resulting in very unstable moldability and a problem of weak tensile strength (approx. 35 MPa).

[0012] Accordingly, in the case of inner liners made of low-density polyethylene, they cannot practically maintain a rectangular shape when filled with contents.

[0013] In addition, when made of high-density polyethylene (HDPE) with a density of 0.95 g / cm³ or higher, the film lacks elasticity and is vulnerable to sudden impacts. Furthermore, due to the very hard texture after molding, on-site work is impossible, so it is not typically used as a raw material for film products, and in particular, there is a problem that it cannot be applied as an inner liner of the present invention. Prior art literature

[0014] Korean Patent Registration No. 10-2006704 The problem to be solved

[0015] The present invention was created to solve the aforementioned problems, and aims to provide an inner liner for a container bag that minimizes shrinkage deformation or failure of the sealing portion during thermal bonding of the inner liner's side wall and the reinforcing material, and improves tensile strength to minimize swelling caused by the load of contents. means of solving the problem

[0016] The present invention for achieving the above objective comprises a container bag having an outer bag woven from a synthetic resin material to maintain the shape of the container bag while maintaining strength, and an inner liner fitted to the inner surface of the outer bag and accommodating contents.

[0017] The inner liner comprises a main body having four side walls and a reinforcing member connecting the mutually adjacent side walls by thermal bonding.

[0018] The above reinforcing member connects both ends of adjacent reinforcing members and forms a second side wall that is thermally joined to the side wall of the main body, and

[0019] The above main body is formed of polyethylene (LDPE) with a density of 0.92 g / cm³ or less, and the above reinforcing member is formed of polyethylene (PE) with a density of 0.925 to 0.94 g / cm³ and a melt index of 0.40 to 0.95 g / 10 min. Effects of the invention

[0020] First, by forming the reinforcing member (20) of the inner liner (100) with polyethylene (PE) having a density of 0.925 to 0.94 g / cm³ and a melt index of 0.40 to 0.95 g / 10 min, the tensile strength and tear strength of the reinforcing member (20) are strengthened compared to general PE, thereby significantly reducing swelling due to the load in the width direction of the contained contents, and also having the effect of minimizing shrinkage deformation or destruction of the sealing part at the heat-bonded portion between the main body (10) and the reinforcing member (20).

[0021] Second, the reinforcing member (20) is formed with a structure having a second side wall (21) that connects both ends of adjacent reinforcing members (20) and is thermally joined to the side wall (11) of the main body (10), so that the side wall (11) and the second side wall (21) together support the widthwise load of the contained contents, thereby further preventing the bulging phenomenon. Brief explanation of the drawing

[0022] FIGS. 1 and FIGS. 2 are drawings showing a conventional container bag and inner liner, FIG. 3 is a perspective view showing an inner liner of one embodiment of the present invention, Fig. 4 is a cross-sectional view of Fig. 3, Figure 5 is a table showing the results of the physical property test. Specific details for implementing the invention

[0023] The inner liner of the embodiment of the present invention minimizes shrinkage deformation or failure of the sealing portion during thermal bonding between the side wall and the reinforcing material, and improves tensile strength to minimize swelling caused by the load of contents.

[0025] FIG. 3 is a perspective view showing an inner liner of a container bag of an embodiment of the present invention in a state where an upper surface (not shown) with an inlet formed and a lower surface (not shown) with an outlet formed are removed, and FIG. 4 is a cross-sectional view of FIG. 3.

[0026] The inner liner (100) has a main body (10) having four side walls (11) and a reinforcing member (20) that connects the mutually adjacent side walls (11) by thermal bonding.

[0028] In the embodiment of the present invention, the inner liner (100) is formed such that the main body (10) is formed of polyethylene with a density of 0.92 g / cm³ or less, and the reinforcing member (20) is formed of polyethylene with a density of 0.925 to 0.94 g / cm³ and a melt index of 0.40 to 0.95 g / 10 min.

[0029] In this case, the main body (10) and the reinforcing member (20) are composed of the same type of polyethylene so that mutual thermal bonding is stably achieved, thereby minimizing shrinkage deformation in the thermal bonding part or destruction of the sealing part. Additionally, by forming the reinforcing member (20) with polyethylene (PE) having a density of 0.925 to 0.94 g / cm³ and a melt index of 0.40 to 0.95 g / 10 min, the tensile strength is improved, thereby minimizing swelling caused by the load of contents, and the elongation is improved, thereby preventing the inner liner from breaking.

[0031] In addition, according to the applicant's experiments, when formed with a polyethylene (PE) film having a melt index of 0.39 g / 10 min or less, the heat bonding time is delayed and productivity is reduced, and when the melt index is 0.96 g / 10 min or more, there are problems such as sticking at the heat bonding part and quality degradation such as the occurrence of pinholes. However, as in the embodiment of the present invention, when a polyethylene (PE) film having a density of 0.925~0.94 g / cm³ and a melt index of 0.40~0.95 g / 10 min is applied to form the main body (10) or reinforcing member (20), the above problems can be solved.

[0033] According to the physical property test results of FIG. 5, by forming the reinforcing member (20) with polyethylene (PE) having a density of 0.925 to 0.94 g / cm³ and a melt index of 0.40 to 0.95 g / 10 min, the tensile strength and tear strength of the inner liner (100) of the present invention are reinforced compared to general PE, thereby significantly reducing swelling due to the load in the width direction of the contained contents, and also minimizing shrinkage deformation or destruction of the sealing part at the heat-bonded portion between the main body (10) and the reinforcing member (20).

[0034] Meanwhile, as shown in FIGS. 3 and 4, the reinforcing member (20) is formed with a structure having a second side wall (21) that connects both ends of adjacent reinforcing members (20) and is thermally joined to the side wall (11) of the main body (10), so that the side wall (11) and the second side wall (21) together support the widthwise load of the contained contents, thereby further preventing the bulging phenomenon. Explanation of the symbols

[0035] 10... (of the inner liner) main body 11...(the) side wall (of the main body) 20...reinforcement bar 21...Second side wall 22...connecting part 100...Inner liner

Claims

Claim 1 An inner liner for a container bag comprising an outer bag woven from a synthetic resin material to maintain the shape of the container bag while maintaining strength, and an inner liner fitted to the inner surface of the outer bag and containing contents, wherein the inner liner (100) comprises a main body (10) having four side walls and a reinforcing member (20) connecting mutually adjacent side walls by heat bonding them together, wherein the reinforcing member (20) has a second side wall (21) formed by connecting both ends of each adjacent reinforcing member (20) and heat-bonding it to the side wall (11) of the main body (10), wherein the main body (10) is formed of low-density polyethylene (LDPE) having a density of 0.92 g / cm³ or less, and the reinforcing member (20) is formed of medium-density polyethylene (PE) having a density of 0.925 to 0.94 g / cm³ and a melt index of 0.40 to 0.95 g / 10 min.

Images