Bag forming device comprising vacuum pad

Abstract

According to one embodiment of the utility model, the bag forming device comprises a mold part with a forming groove; a pressing part facing the molding groove and configured to be relatively movable with respect to the molding groove so as to press the bag-shaped sheet mounted on the mold part toward the molding groove; a molding pad configured to be capable of moving relative to the pressing part in the molding groove to adjust the depth of the molding groove; and a vacuum pad which applies vacuum pressure to the molding groove so as to be closely attached to the bag-shaped sheet, the vacuum pad being disposed in at least one corner region of the molding pad. Thereby, the occurrence of cracks or fractures of the pouch-shaped sheet can be minimized, the tensile size of the pouch-shaped sheet can be maximized, and a pouch case capable of improving energy efficiency can be manufactured.

Description

TECHNICAL FIELD

[0001] The present utility model relates to a bag forming device including a vacuum pad. BACKGROUND

[0002] Unlike primary batteries, secondary batteries are attracting attention as power sources for various mobile devices and electric vehicles, etc. due to the convenience of being able to charge and discharge.

[0003] Such a secondary battery can include a battery cell in which an electrode assembly formed by stacking an anode plate, a cathode plate, and a separator or winding in a roll form is accommodated inside a case. The battery cell can be stacked in a predetermined direction in multiple numbers and accommodated in a battery module or a battery pack.

[0004] On the other hand, depending on the type of the case in which the electrode assembly is accommodated, the battery cell can be classified into a pouch type, a prismatic type, or a cylindrical type, etc.

[0005] Among them, the case of the pouch cell can be manufactured in a deep drawing method in which a pouch outer packaging material is stretched and formed by pressing with a press machine, with the pouch outer packaging material being pressed against a mold groove that is made in advance. Thereby, a cup-shaped portion in which the electrode assembly is accommodated can be formed.

[0006] However, when the pouch sheet is stretched in the mold groove beyond a certain depth, the pouch outer packaging material can have problems such as cracking, wrinkling, or tearing due to the limitation of the pouch outer packaging material itself. SUMMARY

[0007] TECHNICAL PROBLEM

[0008] According to an aspect of the present utility model, it is possible to provide a bag forming device capable of minimizing the occurrence of cracking or breaking of a pouch sheet.

[0009] According to an aspect of the present utility model, it is possible to provide a bag forming device capable of maximizing the stretching size of a pouch sheet.

[0010] According to an aspect of the present utility model, it is possible to provide a bag forming device capable of manufacturing a pouch case that can improve energy efficiency.

[0011] TECHNICAL SOLUTION

[0012] According to one embodiment of the present application, a bag forming device can be provided, including: a mold portion having a forming groove; a punch portion configured to be opposite to the forming groove and configured to be relatively movable with respect to the forming groove to press a bag-shaped sheet mounted on the mold portion toward the forming groove; a forming pad configured to be relatively movable with respect to the punch portion in the forming groove to adjust a depth of the forming groove; and a vacuum pad configured to apply vacuum pressure to the forming groove to be closely adhered to the bag-shaped sheet, the vacuum pad being configured in at least one corner region of the forming pad.

[0013] According to one embodiment, the forming pad includes a plurality of edge portions and at least one corner portion formed between the plurality of edge portions and configured in the corner region, and the vacuum pad can be configured adjacent to the at least one corner portion.

[0014] According to one embodiment, the forming pad divides the forming groove into a first space in which the bag-shaped sheet is introduced and formed, and a second space in which the bag-shaped sheet is not introduced, and the vacuum pad can provide vacuum pressure to the first space to be closely adhered to a corner region of the bag-shaped sheet corresponding to a corner region of the vacuum pad.

[0015] According to one embodiment, the vacuum pad and the forming pad each include an upper surface facing the punch portion to which the bag-shaped sheet can be mounted, and the upper surface of the vacuum pad can be configured side by side with the upper surface of the forming pad or configured lower than the upper surface of the forming pad.

[0016] According to one embodiment, the vacuum pad can be inserted into the forming pad to be exposed to the forming groove through the upper surface of the forming pad.

[0017] According to one embodiment, further including: a vacuum device configured outside the forming groove and forming vacuum pressure; and a vacuum line connecting the vacuum device and the vacuum pad to provide vacuum pressure to the vacuum pad, the vacuum line being capable of penetrating at least one of a forming lower surface or a forming side surface of the mold portion forming the forming groove to be connected to the vacuum device.

[0018] According to one embodiment, the forming pad is configured to be vertically movable in the forming groove to change a relative distance from the punch portion, and the vacuum pad can be configured to be closely adhered to a corner region of the bag-shaped sheet corresponding to a corner region of the forming pad.

[0019] According to one embodiment, the forming pad can be configured to stretch a corner region of the bag-shaped sheet while moving in a direction in which the relative distance from the punch portion is further apart, in a state in which the corner region of the bag-shaped sheet is closely adhered to the vacuum pad.

[0020] According to one embodiment, the punch portion is configured to tightly fit the bag-shaped sheet to the forming pad while moving in a direction in which the relative distance to the forming pad becomes closer, in a state in which the corner region of the bag-shaped sheet is stretched, and the vacuum pad can be configured to be able to continuously provide a vacuum pressure to tightly fit the corner region of the bag-shaped sheet.

[0021] In addition, according to another embodiment of the present application, there is provided a bag forming apparatus including: a die portion having a forming groove and to which a bag-shaped sheet can be mounted; a punch portion configured to be able to relatively move with respect to the forming groove to cause at least a portion of the punch portion to be inserted into the forming groove; a forming pad configured to be able to be raised and lowered within the forming groove to divide the forming groove into a first space into which the bag-shaped sheet is introduced and formed and a second space into which the bag-shaped sheet is not introduced, and to provide a lower surface of the first space; and a vacuum pad to apply a vacuum pressure to the first space to cause the bag-shaped sheet to be introduced into the first space and tightly fit; the vacuum pad being configured at a corner region of the forming pad to cause the bag-shaped sheet to tightly fit to the corner region of the forming pad, and the forming pad can be configured to be able to stretch the bag-shaped sheet while moving in a direction in which the depth of the first space increases, in a state in which the bag-shaped sheet tightly fits to the corner region of the forming pad.

[0022] The above describes the solution according to the present application, but this is exemplary, and even if other configurations not mentioned are added, it should be understood as belonging to the present application.

[0023] Effect of the Invention

[0024] The bag forming apparatus according to one embodiment of the present application can minimize the occurrence of cracks or breaks of the bag-shaped sheet.

[0025] The bag forming apparatus according to one embodiment of the present application can maximize the stretched size of the bag-shaped sheet.

[0026] The bag forming apparatus according to one embodiment of the present application can manufacture a bag housing that can improve energy efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a schematic view of a bag forming apparatus according to one embodiment of the present application.

[0028] Figure 2 is a brief exploded perspective view of a bag forming apparatus according to one embodiment of the present application.

[0029] Figure 3 is a plan view of a forming pad according to one embodiment of the present application.

[0030] Figure 4 and Figure 5is a diagram schematically showing a process of molding a bag-shaped sheet by a vacuum pad according to one embodiment of the present application.

[0031] Figure 6 is a diagram schematically showing a process of molding a bag-shaped sheet by a punch according to one embodiment of the present application. DETAILED DESCRIPTION

[0032] Before the embodiments are described in detail the following explanations and terms or words used in the technical solutions should not be limited to be interpreted in the usual meaning or dictionary meaning, the inventor bases on the principle that the terms can be properly defined in the concept of the terms to best explain its own utility model, and these terms or words should be interpreted in the meaning and concept in accordance with the technical idea of the present application.

[0033] The same reference numerals or symbols denoted in each drawing represent components or constituent elements performing substantially the same function. For the convenience of explanation and understanding, the same reference numerals or symbols can also be used for explanation in different embodiments.

[0034] In the following explanations, in the case where there is no obvious different meaning in the context, the singular expression includes the plural expression. It should be understood that the term "comprise" or "consist" and the like terms are intended to indicate the existence of the features, numbers, steps, operations, constituent elements, components or combinations thereof described in the specification, and are not intended to exclude the existence or additional possibility of one or more other features, numbers, steps, operations, constituent elements, components or combinations thereof.

[0035] In addition, it needs to be noted in advance that in the following explanations, the expressions of upper side, upper portion, lower side, lower portion, side surface, front surface, rear surface and the like are expressed based on the direction shown in the drawings, and if the direction of the corresponding object is changed, there can be different expressions.

[0036] In addition, for the distinction between the constituent elements in the following explanations and technical solutions, terms containing ordinal numbers such as "first", "second" and the like can be used. Such ordinal numbers are used to distinguish the same or similar constituent elements, and the meaning of the terms should not be limited by the numbers. For example, the constituent elements combined with such ordinal numbers should not be interpreted as being limited by the order of use or placement. These ordinal numbers can be used alternately as needed.

[0037] The bag molding device according to one embodiment of the present application will be described below with reference to the drawings.

[0038] Figure 1 is a schematic view of a bag molding device according to one embodiment of the present application, Figure 2is a brief exploded oblique view of a bag forming device according to one embodiment of the present application. On the other hand, although a bag-shaped sheet P used in the present application is also shown together in the drawing, this is shown together only for the sake of convenience in understanding, and the bag forming device of the present application can not include the bag-shaped sheet P.

[0039] Referring to Figure 1 and Figure 2 , the bag forming device according to one embodiment of the present application can include: a mold portion 10 having a forming groove S; a punch portion 20 configured to be opposite to the mold portion 10, and to introduce the bag-shaped sheet P into the forming groove S while relatively moving toward the forming groove S; a forming support portion 30 configured to be provided in the forming groove S, and to support the punch portion 20 including a forming pad 31; and a vacuum forming portion 35 forming a vacuum in the forming groove S.

[0040] In addition, according to one embodiment, a vacuum device 38 communicating with the vacuum forming portion 35, and a control portion 50 connected to at least one of the mold portion 10, the forming pad 31, or the vacuum forming portion 35 and controlling them can be included. In addition, according to one embodiment, a pressing strip 40 fixing the bag-shaped sheet P to the mounting surface 13 can be included.

[0041] The bag-shaped sheet P can be an outer packaging material forming a case of a secondary battery, i.e., a battery cell. The bag-shaped sheet P can be formed in a predetermined shape corresponding to the forming groove S, forming a cup-shaped portion which can accommodate an electrode assembly. As the depth of the cup-shaped portion increases while the bag-shaped sheet P is formed, the inner bag case can accommodate a larger electrode assembly, and thus the energy efficiency of the battery cell can be improved. However, as the depth of the cup-shaped portion increases, the stretching size of the bag-shaped sheet P as the outer packaging material of the case also increases, and there are limitations in increasing the stretching size of the bag-shaped sheet P, such as cracks. According to the present application, the stretching size of the bag-shaped sheet P can be further increased while the bag-shaped sheet P is formed, and as a result, a battery cell case having a larger capacity can be provided.

[0042] The mold portion 10 can include a forming inner surface 11, 12 forming the forming groove S, and a mounting surface 13 provided around the forming groove S to mount the bag-shaped sheet P. In Figure 2 , the forming groove S is illustrated as a plurality of forming grooves S, and it is illustrated that a plurality of cup-shaped portions can be formed with one bag-shaped sheet P, but this is only for the sake of convenience in understanding, and the present application is not limited thereto. That is, even if only at least one forming groove S is formed, it should be considered to belong to the scope of the present application.

[0043] The molding groove S can refer to a space formed by the molding lower surface 11 and the molding side surface 12, in which the mold part 10 is recessed inward. The pouch sheet P can be introduced into the molding groove S and molded by the punch part 20 or the vacuum forming part 35 to be mentioned later.

[0044] The installation surface 13 can refer to an upper surface of the mold part 10 extending from the molding side surface 12 to the edge of the molding groove S. The installation surface 13 can provide a space to install or place the pouch sheet P. The pressing bar 40 is disposed opposite to the installation surface 13.

[0045] The pressing bar 40 can fix at least a portion of the pouch sheet P opposite to the molding pad 31 by applying pressure to the pouch sheet P toward the installation surface 13, so that the pouch sheet P is introduced into the molding groove S.

[0046] The punch part 20 is disposed opposite to the molding groove S and is capable of moving in a direction in which the distance opposite to the molding groove S is changed. The punch part 20 has a shape corresponding to the molding groove S, at least a portion of which can be moved to be inserted into the inside of the molding groove S (refer to Figure 6 ).

[0047] The punch part 20 can press the pouch sheet P installed on the mold part 10 toward the molding groove S, so that at least a portion of the pouch sheet P can be introduced into the molding groove S.

[0048] The molding support part 30 can include the molding pad 31 disposed opposite to the punch part 20 capable of moving relative to the molding groove S, and the pad support part 32 supporting the molding pad 31.

[0049] The molding pad 31 can support molding of the pouch sheet P. That is, the pouch sheet P can be placed on the upper surface (a surface facing the punch part 20) of the molding pad 31 and molding can be achieved. The upper surface of the molding pad 31 can form a lower surface of the first space S1 to be mentioned later.

[0050] In other words, the shape of the upper surface of the molding pad 31 can determine the shape of the cup-shaped portion when the pouch sheet P is molded. In the drawing, the molding pad 31 is illustrated in a rectangular parallelepiped shape aligned with the molding lower surface 11, but of course can be formed in various ways according to the shape of the cup-shaped portion required.

[0051] The molding pad 31 can support the punch part 20 when the punch part 20 is introduced into the molding groove S, so that the pouch sheet P is pressed (refer to Figure 6 ). In addition, the vacuum pad 36 to be mentioned later is disposed on the molding pad 31, and the pouch sheet P can be concentrated to be closely attached to the corner 31c of the molding pad 31 (refer to Figure 3 ). This will be described later.

[0052] In addition, the molding pad 31 can divide the molding groove S into the first space S1 and the second space S2 (refer toFigure 5 ). In the first space S1 of the forming groove S, the forming of the bag-like sheet P can be achieved by introducing the bag-like sheet P and at least a portion of the punch portion 20. In the second space S2, the cushion support portion 32 and a vacuum pipe 37 to be mentioned later can be arranged. Here, the introduction can mean that the bag-like sheet P can be arranged in the first space S1.

[0053] The first space S1 is a space in which the bag-like sheet P is introduced and in which the stretching or forming of the bag-like sheet P occurs, and can be referred to as an "upper space", and the second space S2 is a space in which the bag-like sheet P is not introduced and in which the cushion support portion 32 can be arranged, and can be referred to as a "lower space".

[0054] In addition, here, the "dividing the forming groove S into the first space S1 and the second space S2" does not necessarily mean physically strictly separating or blocking the two spaces, but can mean functionally dividing the forming groove S into a space in which the bag-like sheet P is introduced and a space in which the bag-like sheet P is not introduced.

[0055] In other words, a space formed by the upper surface of the forming cushion 31 and the forming side surface 12 can be referred to as the first space S1, and a space formed by the lower surface of the forming cushion 31 and the forming lower surface 11 and the forming side surface 12 can be referred to as the second space S2.

[0056] In addition, the forming cushion 31 is arranged to be able to be raised and lowered in the forming groove S by the cushion support portion 32 to be mentioned later, so that the depth of the forming groove S, specifically the depth of the first space S1 in which the bag-like sheet P is introduced and formed, can be adjusted.

[0057] The cushion support portion 32 can be arranged in the second space S2 of the forming groove S to support the forming cushion 31. In one embodiment, one side of the cushion support portion 32 is connected to the lower surface (a surface facing the forming lower surface 11) of the forming cushion 31, and the other side is connected to the forming lower surface 11, thereby supporting the forming cushion 31.

[0058] In addition, the cushion support portion 32 can relatively move the forming cushion 31 with respect to the punch portion 20. In other words, the cushion support portion 32 can raise and lower the forming cushion 31 in the forming groove S.

[0059] When the forming cushion 31 is raised and lowered, the depth of the first space S1 and the depth of the second space S2 of the forming groove S can change. Specifically, when the cushion support portion 32 lowers the forming cushion 31, the depth of the first space S1 can increase and the depth of the second space S2 can decrease. Conversely, when the cushion support portion 32 raises the forming cushion 31, the depth of the first space can decrease and the depth of the second space can accordingly increase.

[0060] As described above, the pad support portion 32 can change the depth of the forming groove S (specifically, the space in which forming is performed, i.e., the first space S1) by the forming pad 31. The lifting distance or speed of the forming pad 31 of the pad support portion 32 can be controlled by the control portion 50.

[0061] In addition, before the bag-shaped sheet P is formed, the forming pad 31 can be arranged side by side with the mounting surface 13 of the mold portion 10. That is, it can be arranged such that the depth of the second space S2 is substantially equal to the depth of the forming groove S (refer to FIG. 2). Figure 4 As mentioned later, in this state, the vacuum pad 36 can make the bag-shaped sheet P closely adhere to the corner portion 31c of the forming pad 31. However, the present application is not limited thereto.

[0062] In addition, the pad support portion 32 can include an elastic body to provide elastic support to the forming pad 31. For example, the pad support portion 32 can include a substance having elasticity such as a spring to support the forming pad 31. However, the present application is not limited thereto, and any structure capable of supporting the forming pad 31 falls within the scope of the present application.

[0063] The vacuum forming portion 35 can form the bag-shaped sheet P by applying vacuum pressure to the forming groove S. The vacuum forming portion 35 can include a vacuum pad 36 arranged to be closely adhered to the bag-shaped sheet P and a vacuum line 37 to communicate the vacuum pad 36 and a vacuum device 38.

[0064] The vacuum pad 36 is arranged to be exposed on the upper surface of the forming pad 31, thereby being capable of applying vacuum pressure to the forming groove S, specifically, to the first space S1 of the forming groove S. Herein, "exposed" can mean a structure arranged to be capable of closely adhering the vacuum pad 36 to the bag-shaped sheet P.

[0065] For example, the vacuum pad 36 can be inserted into the forming pad 31 such that the upper surface of the vacuum pad 36 is arranged side by side with the upper surface of the forming pad 31, and the lower surface of the vacuum pad 36 can be arranged to communicate with the vacuum line 37 to be mentioned later, thereby being capable of receiving vacuum pressure. That is, as long as the vacuum pressure of the vacuum pad 36 is capable of closely adhering the bag-shaped sheet P to the vacuum pad 36, the structure can be deformed.

[0066] In addition, the upper surface of the vacuum pad 36 can be arranged substantially side by side with the upper surface of the forming pad 31, or lower than the upper surface of the forming pad 31. Specifically, if the upper surface of the vacuum pad 36 protrudes above the upper surface of the forming pad 31, the portion of the vacuum pad 36 can be deformed or broken by the punching portion 20 to be mentioned later (refer to FIG. 4). Figure 6 In addition, the upper surface of the vacuum pad 36 can be arranged substantially side by side with the upper surface of the forming pad 31, or lower than the upper surface of the forming pad 31. Specifically, if the upper surface of the vacuum pad 36 protrudes above the upper surface of the forming pad 31, the portion of the vacuum pad 36 can be deformed or broken by the punching portion 20 to be mentioned later (refer to FIG. 4).

[0067] On the other hand, the "vacuum pressure" referred to in the present application can refer to include negative pressure, because the vacuum pad 36 provides a lower pressure than the surrounding atmospheric pressure, enabling air and the like around the upper surface of the vacuum pad 36 to be sucked into the vacuum pad 36. In other words, the vacuum pad 36 can form a vacuum pressure in the molding groove S, enabling the bag-like sheet P to be sucked toward the vacuum pad 36 and closely adhere thereto.

[0068] In other words, the vacuum pad 36 can enable the bag-like sheet P to be closely adhered while being sucked. As described later Figure 4 and Figure 5 As mentioned above, in a state in which the bag-like sheet P is closely adhered to the vacuum pad 36 disposed in the vicinity of the corner portion 31c of the molding pad 31, as the molding pad 31 descends, the vicinity of the corner portion of the bag-like sheet P can be concentratedly stretched.

[0069] Further, the vacuum pad 36 can include a material having an elastic force that can improve the adhesion to the bag-like sheet P. For example, the vacuum pad 36 can include a rubber of an Ethylene Propylene Diene Monomer (EPDM) material.

[0070] The vacuum line 37 can be disposed outside the molding groove S, enabling the vacuum pad 36 and a vacuum device 38 that forms a vacuum pressure to communicate. The vacuum line 37 can be disposed in the second space S2, preventing interference with the bag-like sheet P. For example, one side of the vacuum line 37 can be connected to the vacuum pad 36 disposed on the molding pad 31, and the other side can penetrate the molding lower surface 11 or the molding side surface 12, and be connected to the vacuum device 38 disposed outside the molding groove S. In addition, the vacuum line 37 can be disposed to penetrate the molding pad 31 as shown, but the present application is not limited thereto.

[0071] As described above, the connection structure of the vacuum line 37 and the vacuum device 38 of the present application is only one example, and if it is a structure that can provide a vacuum pressure to the vacuum pad 36, it can be variously modified.

[0072] Figure 3 A plan view of the molding pad 31 according to one embodiment of the present application is a view showing the upper surface of the molding pad 31 and a view partially enlarging a corner area of the molding pad 31.

[0073] Referring to Figure 3 , the molding pad 31 has a substantially quadrangular shape, and can include four edge portions 13b and four corner portions 13c in correspondence with the shape of the molding groove S. The corner portion 13c can be disposed in a corner area of the molding pad 31 (refer toFigure 3 a partial enlarged view of FIG. 1).

[0074] In another aspect, the part adjacent to the edge portion 31b and the corner portion 31c of the formed pad 31 can be referred to as a peripheral area of the formed pad 31, and the part of the non-peripheral area can be referred to as a central area of the formed pad 31.

[0075] In other words, the formed pad 31 can include a central area in which the edge portion 31b and the corner portion 31c are not provided, and a peripheral area in which the edge portion 31b and the corner portion 31c are provided. The peripheral area can include a corner area (refer to Figure 3 a partial enlarged view of FIG. 1) in which the corner portion 31c is disposed, and an edge area in which the corner portion 31c is not disposed but only the edge portion 31b is disposed.

[0076] On the upper surface of the formed pad 31, the bag-shaped sheet P is closely adhered by the punch portion 20 so that the bag-shaping process can be performed (refer to Figure 6 In this process, concentrated stretching of the bag-shaped sheet P can occur in a part corresponding to the peripheral area of the formed pad 31. In particular, in the peripheral area, concentrated stretching of the bag-shaped sheet P can occur more in the corner area (refer to Figure 3 a partial enlarged view of FIG. 1) in which the corner portion 31c is disposed, resulting in cracking or breaking of the bag-shaped sheet P.

[0077] In this regard, the present application pre-concentrates the corner area of the bag-shaped sheet P corresponding to the corner area of the formed pad 31 by the vacuum pad 36 before the forming process by the punch portion 20, thereby minimizing the occurrence of cracking or breaking of the corner area of the bag-shaped sheet P when the bag-shaped sheet P is secondarily stretched by the punch portion 20.

[0078] According to an embodiment of the present application, the vacuum pad 36 can be disposed in the corner area of the formed pad 31 (refer to Figure 3 a partial enlarged view of FIG. 1). The vacuum pad 36 can be disposed adjacent to the corner portion 31c of the corner area.

[0079] Here, the meaning of being disposed adjacent to can mean that the distance d (hereinafter referred to as "the shortest distance between the corner portion 31c and the vacuum pad 36") between the corner portion 31c of the formed pad 31 and the nearest part of the vacuum pad 36 satisfies a predetermined range.

[0080] For example, the shortest distance between the corner portion 31c and the vacuum pad 36 can be 1 mm to 10 mm. However, such a numerical value is merely an example for easy understanding, and the present application is not limited thereto since such a numerical value can vary depending on the shape size of the molded pad 31 and the vacuum pad 36, the size of the bag-shaped sheet P, and the like.

[0081] Further, the "vacuum pad 36 is disposed adjacent to the corner portion 31c" can mean that the vacuum pad 36 is disposed adjacent to both of the edge portions 31b forming the corner portion 31c. For example, as shown in a partial enlarged view (corner region) of FIG. 6, the vacuum pad 36 can be disposed adjacent to both of the edge portion 31b disposed above and the edge portion 31b disposed on the right with reference to the drawing surface of the vacuum pad 36. Figure 3

[0082] On the other hand, according to another embodiment of the present application, although not shown in the drawings, the vacuum pad 36 can be a corner region. That is, the molded pad 31 and the molded side surface 12 can have a shape in which the vacuum pad 36 is disposed therebetween. In other words, as long as it is a structure for locally applying negative pressure to the corner region of the bag-shaped sheet P, it should be understood to belong to the present application.

[0083] On the other hand, the center region, the peripheral region, the corner region, and the edge region of the molded pad 31 described above can be hypothetical regions for explaining the disposition position of the vacuum pad 36. Therefore, as long as it is a structure for concentrating vacuum pressure on the corner region of the bag-shaped sheet P, the present application is not particularly limited thereto.

[0084] Hereinafter, with reference to FIGS. 1 to 8, Figures 4 to 6 a molding process of a bag-shaped sheet using the bag molding apparatus according to the present application will be described.

[0085] Figure 4 and Figure 5 is a drawing schematically showing a process of molding a bag-shaped sheet by a vacuum pad according to one embodiment of the present application, Figure 6 is a drawing schematically showing a process of molding a bag-shaped sheet by a punch according to one embodiment of the present application.

[0086] The bag molding apparatus according to the present application can mold the bag-shaped sheet P by a first molding process and a second molding process. By Figure 4 and Figure 5 a first molding process will be described, and by Figure 6 a second molding process will be described.

[0087] With reference to FIGS. 1 to 8, Figure 4 ​The bag forming device of the present application can apply vacuum pressure to the forming groove S through the vacuum forming portion 35. The vacuum pad 36 arranged at the corner area of the forming pad 31 can be tightly attached to the corner area of the bag-shaped sheet P while sucking the corner area of the bag-shaped sheet P. In other words, as long as the vacuum pad 36 is not attached to the central area of the bag-shaped sheet P but to the peripheral area, especially the corner area, the structure that can be tightly attached to the corner area is within the scope of the present application.

[0088] Referring to Figure 5 , in the state that the vacuum pad 36 is tightly attached to the bag-shaped sheet P, the forming pad 31 can be lowered in the forming groove S so that the relative distance from the punch portion 20 becomes larger. That is, as the forming pad 31 is lowered, the depth of the forming groove S, specifically the depth of the first space S1 in which the bag-shaped sheet P is formed, can be changed.

[0089] As described above, the forming pad 31 can be lowered in the state that the vacuum pad 36 is tightly attached to the corner area of the bag-shaped sheet P. In the central area and the peripheral area of the bag-shaped sheet P, the peripheral area, especially the corner area, can be concentratedly stretched.

[0090] In other words, in the first forming process, the bag-shaped sheet P is tightly attached to the forming pad 31 arranged inside the forming groove S, and at least a part of the bag-shaped sheet P can be stretched by lowering the forming pad 31. In addition, the first forming process can include a first stage in which the bag-shaped sheet P is tightly attached to the corner area of the forming pad 31 by the vacuum pad 36 and a second stage in which the bag-shaped sheet P is stretched while the forming pad 31 is moved (lowered) in a direction away from the punch portion 20.

[0091] Specifically, the first stage can be a stage in which the peripheral area of the forming pad 31, especially the corner area of the bag-shaped sheet P corresponding to the corner area of the forming pad 31, is tightly attached to the corner area of the forming pad 31 by the vacuum pad 36 (see Figure 4 ). In addition, the second stage can be a stage in which the corner area of the bag-shaped sheet P corresponding to the corner area of the forming pad 31 is stretched by lowering the forming pad 31 (see Figure 5 ).

[0092] Through this series of processes, the corner area can be concentratedly stretched in the peripheral area of the bag-shaped sheet P.

[0093] Referring to Figure 6 , in the second forming process, the punch portion 20 can be moved toward the forming groove S while the peripheral area and the central area of the bag-shaped sheet P are pushed and pressurized toward the upper surface of the forming pad 31. Through Figure 4 and Figure 5According to the first molding process described above, the corner regions of the bag-shaped sheet P are secondarily stretched by the punch portion 20 in a state where the corner regions are first stretched, and thus it is possible to maximize the stretching of the bag-shaped sheet P while preventing cracks or breaks from occurring in the corner regions of the bag-shaped sheet P.

[0094] On the other hand, according to one embodiment, the vacuum pad 36 can continuously adhere to the bag-shaped sheet P even during the process in which the punch portion 20 is inserted into the molding groove S in a direction close to the upper surface of the molding pad 31. That is, the vacuum pad 36 continuously adheres to the bag-shaped sheet P by Figures 4 to 6 According to the first molding process and the second molding process described above, the vacuum pressure or negative pressure is continuously applied during the processes, and thus it is possible to continuously adhere to the corner regions of the bag-shaped sheet P.

[0095] Although various embodiments of the present application have been described in detail above, the scope of the technical solution of the present application is not limited thereto, and various modifications and changes can be made within the scope of the technical idea of the present application described in the technical solution, which will be apparent to those having ordinary knowledge in the art. In the above-described embodiments, some of the constituent elements can be deleted to be implemented, and the embodiments can be combined with each other to be implemented.

[0096] The above-described contents are merely examples of applying the principle of the present application, and other constituents can be further included within the scope of the present application without departing from the scope of the present application.

[0097] Symbol Explanation

[0098] 10: mold portion; 20: punch portion;

[0099] 30: molding support portion; 40: pressing bar;

[0100] 50: control portion; S: molding groove;

[0101] S1: first space of the molding groove; S2: second space of the molding groove.

Claims

1. A bag forming apparatus, characterized in that, include: The mold section has a forming groove; The stamping section is configured to be opposite to the forming groove and to be movable relative to the forming groove in order to press the bag-shaped sheet mounted on the mold section toward the forming groove; A forming pad is configured to be movable relative to the stamping part within the forming groove to adjust the depth of the forming groove; and A vacuum pad applies vacuum pressure to the forming groove to ensure a tight fit with the bag-shaped sheet; The vacuum pad is disposed in at least one corner region of the molding pad.

2. The bag forming apparatus according to claim 1, characterized in that, The molding pad includes a plurality of edge portions and at least one corner portion formed between the plurality of edge portions and disposed in the corner region. The vacuum pad is configured to be adjacent to the at least one corner.

3. The bag forming apparatus according to claim 1 or 2, characterized in that, The forming pad divides the forming groove into a first space for configuring the bag-shaped sheet and a second space for not configuring the bag-shaped sheet. The vacuum pad provides vacuum pressure to the first space to tightly fit the corner area of ​​the bag-shaped sheet corresponding to the corner area of ​​the vacuum pad.

4. The bag forming apparatus according to claim 1 or 2, characterized in that, The vacuum pad and the molding pad each include an upper surface facing the stamping part, on which the bag-shaped sheet can be mounted. The upper surface of the vacuum pad is arranged side by side with the upper surface of the molding pad or is arranged below the upper surface of the molding pad.

5. The bag forming apparatus according to claim 4, characterized in that, The vacuum pad is inserted into the molding pad so that it is exposed through the molding groove via the upper surface of the molding pad.

6. The bag forming apparatus according to claim 1 or 2, characterized in that, Also includes: A vacuum device is disposed outside the forming tank to create vacuum pressure; and A vacuum line connects the vacuum device and the vacuum pad to provide vacuum pressure to the vacuum pad; The vacuum line penetrates at least one of the lower molding surface or the side molding surface of the mold portion forming the molding groove to connect with the vacuum device.

7. The bag forming apparatus according to claim 1 or 2, characterized in that, The forming pad is configured to move up and down within the forming groove to change its relative distance to the stamping section. The vacuum pad is configured to fit tightly against the corner region of the bag-shaped sheet corresponding to the corner region of the molding pad.

8. The bag forming apparatus according to claim 7, characterized in that, The forming pad is configured such that, while the vacuum pad and the corner region of the bag-shaped sheet are in close contact, the corner region of the bag-shaped sheet can be stretched while moving in a direction that increases in relative distance from the stamping part.

9. The bag forming apparatus according to claim 7, characterized in that, While the corner region of the bag-shaped sheet is stretched, the stamping part moves in a direction that brings it closer to the forming pad, causing the bag-shaped sheet to fit tightly against the forming pad. The vacuum pad is configured to continuously provide vacuum pressure to fit tightly against the corner regions of the bag-shaped sheet.

10. A bag forming apparatus, characterized in that, include: The mold section has a forming groove and can accommodate bag-shaped sheets; The stamping section is configured to be movable relative to the forming groove so that at least a portion is inserted into the forming groove; A forming pad is configured to be able to move up and down within the forming groove, dividing the forming groove into a first space in which the bag-shaped sheet is introduced and formed and a second space in which the bag-shaped sheet is not introduced, and providing a lower surface of the first space; and A vacuum pad applies vacuum pressure to the first space, causing the bag-shaped sheet to be introduced into the first space and fit tightly. The vacuum pad is positioned at the corner region of the molding pad so that the bag-shaped sheet fits tightly against the corner region of the molding pad. The molding pad is configured such that, while the bag-shaped sheet is tightly fitted to the corner region of the molding pad, the bag-shaped sheet can be stretched while moving in the direction of increasing depth of the first space.

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