Valve bag for automatic powder filling machine

Abstract

The utility model discloses a valve bag for an automatic powder filling machine, which comprises a bag body with a bag opening at the top and the bottom, the bag opening is formed by bending and sticking a first folding part and a second folding part, a reinforcing sealing strip is arranged below the bent bag opening, a valve opening with a double-layer structure is arranged below the reinforcing sealing strip at the top, and the valve opening is connected with the valve opening. And the peripheral surface of the valve port is fixedly bonded with the reinforcing sealing strip. Powder is prevented from leaking from a gap of a bag opening, cost is saved, the heating clamp is used for heating the outer layer paper, so that the inner layer paper at the heating position is fused at high temperature to form a sealing part, automatic packaging is achieved, and powder filling efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of valve bags, in particular to a valve bag used in an automatic powder filling machine. Background Art

[0002] Valve bags, commonly known as paste-bottom bags, are currently popular international packaging bags. They are fed from the top or bottom valve port and use special filling equipment. After filling the materials, they are packed into cubes. The bags are neatly stacked and beautiful. They are environmentally friendly bags. Valve bags are mainly used to package edible powder, chemical powder, fertilizer, synthetic materials, explosives, grain, salt, minerals and other powdered or granular solid materials and flexible items.

[0003] The existing valve port structure is separated from the valve bag body. The valve port is expanded into a circular shape by using the expander of the automatic filling machine. The conventional valve bag and the valve port structure are stacked in the placement area and are flat. Since the valve port structure is separated from the valve bag body, it is easy to cause unsmooth expansion and powder leakage. When filling leather powder, the powder is easy to spray out from the gaps at the four corners of the valve bag (especially the two gaps at the top), which will cause powder leakage and pollute the packaging environment. At the same time, the valve port cannot be automatically sealed. Utility Model Content

[0004] The purpose of the utility model is to provide a valve bag for an automatic powder filling machine, wherein a reinforced sealing strip and a valve mouth with a double-layer structure are arranged below the bag mouth, and the valve mouth is fixed to the bag body and the reinforced sealing strip of the valve bag by dispensing or spraying glue, thereby solving the above-mentioned problems existing in the prior art.

[0005] In order to solve the above technical problems, the utility model adopts the following solutions:

[0006] A valve bag for an automatic powder filling machine comprises a bag body with bag openings at the top and bottom, the bag openings being formed by bending and pasting a first folding portion and a second folding portion, a reinforcing sealing strip being provided below the bent bag opening, a valve opening of a double-layer structure being provided below the reinforcing sealing strip at the top, and an outer peripheral surface of the valve opening being fixedly bonded to the reinforcing sealing strip.

[0007] Preferably, the first folding portion is provided with a first folding line, the second folding portion is provided with a second folding line, and the width of the reinforced sealing strip is greater than the distance between the first folding line and the second folding line.

[0008] Preferably, the reinforced sealing strip comprises a third folding portion and a fourth folding portion, wherein the third folding portion and the fourth folding portion are provided with a third folding line and a fourth folding line respectively overlapping with the first folding portion and the second folding portion.

[0009] Preferably, the surface of the reinforced sealing strip is coated with environmentally friendly glue and is bonded and fixed to the first folding part and the second folding part.

[0010] Preferably, the valve port comprises an outer layer of paper and an inner layer of paper, the inner layer of paper is wound around the inner side of the outer layer of paper, the outer layer of paper is kraft paper, and the inner layer of paper is a cast polyethylene film.

[0011] Preferably, after the valve opening is heated, the top surface and the bottom surface of the inner paper are fused to form a sealing portion.

[0012] Preferably, the outer peripheral surface of the outer layer of paper is fixedly connected to the top of the bag body and the bottom surface of the reinforced sealing strip respectively by spraying or dispensing glue.

[0013] Preferably, the length of the overlapping portion formed by the outer layer of paper, the inner layer of paper and the top of the bag body is smaller than the length of the top of the bag body.

[0014] The utility model has the beneficial effects:

[0015] In the utility model, a reinforced sealing strip is arranged below the top bag opening, which is used to seal the overlapping part of the first folding part and the second folding part, so as to prevent the powder from leaking from the gap of the bag opening during filling, thereby saving costs; and a valve opening of a double-layer structure is arranged, the outer layer of paper is fixedly connected with the bag body and the reinforced sealing strip by spraying or dispensing glue, and the inner layer of paper adopts a cast polyethylene film. After the powder filling is completed, a heating fixture is used to heat the outer layer of paper, so that the inner layer of paper at the heated position is fused at high temperature to form a sealing part, thereby realizing automatic packaging and high powder filling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 It is a schematic diagram of the folding and unfolding structure of the utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the valve port of the utility model when the outer layer of paper is unfolded;

[0019] Figure 4 This is a cross-sectional view of the sealing portion formed after heating of the utility model;

[0020] Figure 5 The utility model is a schematic diagram of the bonding structure between the reinforced sealing strip and the bag opening.

[0021] Figure markings: 1-bag body, 10-bag opening, 2-first folding part, 3-second folding part, 4-reinforced sealing strip, 40-third folding part, 41-fourth folding part, 5-valve mouth, 50-outer layer of paper, 51-inner layer of paper, 52-sealing part, 6-first fold line, 7-second fold line, 8-third fold line, 9-fourth fold line. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below in conjunction with the embodiments and drawings, but the implementation manner of the present invention is not limited thereto.

[0023] In the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inside", "outside", "front", "back", "top", "bottom", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model.

[0024] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "open", "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Example 1

[0026] Embodiment 1 of the utility model is a valve bag for an automatic powder filling machine, comprising a bag body 1 with bag openings 10 at the top and bottom, the bag opening 10 being formed by bending and pasting a first folding portion 2 and a second folding portion 3, a reinforcing sealing strip 4 being provided below the bent bag opening 10, a double-layer valve opening 5 being provided below the reinforcing sealing strip 4 at the top, and the outer peripheral surface of the valve opening 5 being fixedly bonded to the reinforcing sealing strip 4.

[0027] The valve port 5 bag of the utility model is made of kraft paper as a whole, and the top and bottom thereof are both bag openings 10. The bag opening 10 at the top is selected for filling powdered materials, and the bag opening 10 at the bottom is used to cover the bottom, so as to prevent the powdered leather material from leaking from the bottom bag opening 10 when filling through the top bag opening 10. The bag opening 10 is mainly composed of a first folding portion 2 and a second folding portion 3, and the first folding portion 2 and the second folding portion 3 are integrally formed with the bag body 1 and are formed by bending. Therefore, there is no gap in the connection between the first folding portion 2, the second folding portion 3 and the longitudinal surface of the bag body 1, so as to prevent the powder from leaking here during filling.

[0028] Specifically, a reinforced sealing strip 4 and a valve mouth 5 with a double-layer structure are sequentially arranged below the bag opening 10. The second folding portion 3 is first bent on the surface of the reinforced sealing strip 4, and then the first folding portion 2 is bent, and they are bonded to each other, so that the overlapping portion between the first folding portion 2 and the second folding portion 3 is sealed under the action of the reinforced sealing strip 4. The outer peripheral surface of the double-layer valve mouth 5 is fixedly connected to the bag body 1 and the reinforced sealing strip 4, so that when the leather powder is filled through the valve mouth 5, it enters the interior of the bag body 1. The reinforced sealing strip 4 effectively prevents the powder from leaking from the overlapping portion of the first folding portion 2 and the second folding portion 3, which is beneficial to cost saving and is beneficial to the expansion of the valve mouth 5.

[0029] In some preferred embodiments, the first folding portion 2 is provided with a first folding line 6 , the second folding portion 3 is provided with a second folding line 7 , and the width of the reinforced sealing strip 4 is greater than the distance between the first folding line 6 and the second folding line 7 .

[0030] The first fold line 6 and the second fold line 7 are used to assist in the bending of the first folding portion 2 and the second folding portion 3 to form a seal on the surface of the bag opening 10. The width of the reinforcing sealing strip 4 mainly depends on the distance between the first fold line 6 and the second fold line 7. The width of the reinforcing sealing strip 4 is always greater than the distance between the two. During bonding, the surface of the reinforcing sealing strip 4 always seals the first folding portion 2, the second folding portion 3 and the overlapping portion therebetween to avoid powder leakage.

[0031] In some preferred embodiments, the reinforcing sealing strip 4 includes a third folding portion 40 and a fourth folding portion 41, and the third folding portion 40 and the fourth folding portion 41 are provided with a third folding line 8 and a fourth folding line 9 respectively overlapping with the first folding portion 2 and the second folding portion 3. The surface of the reinforcing sealing strip 4 is coated with environmentally friendly glue to be bonded and fixed to the first folding portion 2 and the second folding portion 3.

[0032] Specifically, refer to Figure 5 The reinforcing sealing strip 4 is bent through the third fold line 8 and the fourth fold line 9. During the bending process, it overlaps with the first folding part 2 and the second folding part 3. Environmentally friendly glue is applied to the area where the reinforcing sealing strip 4 contacts the first folding part 2 and the second folding part 3. At the same time, environmentally friendly glue is applied to the area where the third folding part 40 and the fourth folding part 41 after bending contact with the first folding part 2 and the second folding part 3, so that the overlapping part between the first folding part 2 and the second folding part 3 forms a completely closed area with the reinforcing sealing strip 4, thereby preventing powder leakage from the gap in the overlapping part of the first folding part 2 and the second folding part 3 when feeding powder.

[0033] Example 2

[0034] Embodiment 2 of the present invention is implemented on the basis of embodiment 1, the valve port 5 comprises an outer paper 50 and an inner paper 51, the inner paper 51 is wound around the inner side of the outer paper 50, the outer paper 50 is kraft paper, and the inner paper 51 is a cast polyethylene film. After the valve port 5 is heated, the top surface and the bottom surface of the inner paper 51 are fused to form a sealing portion 52.

[0035] In the present application, the existing single valve port 54 is designed as a double-layer structure valve port 54, and the double-layer structure includes an outer layer of paper 5040 and an inner layer of paper 5141, wherein the inner layer of paper 5141 is wrapped around the inner side of the inner layer of paper 5141 and serves as the main feeding channel. At the same time, the outer layer of paper 5040 surrounds the inner layer of paper 5141 and is located below the bag opening 1010 for fixed connection. The fixed connection can be achieved by gluing or other methods, which can be selected according to actual conditions, so as to avoid leakage of powder from the valve port 54 to the bag opening 1010 during the feeding process.

[0036] At the same time, since the inner paper 51 is specifically a cast polyethylene film, i.e., CPP film, it has the characteristics of light weight, high transparency, good flatness, good rigidity, strong mechanical adaptability, excellent heat sealing, moisture resistance and heat resistance, good smoothness, high film-making speed, uniform thickness, moisture resistance, oil resistance, heat resistance and cold resistance, easy heat sealing, etc. After the leather powder is added, according to the characteristics of the cast polyethylene film itself, the upper and lower surfaces of the outer film are heated, so that the top and bottom surfaces of the inner paper 51 are fused due to the high temperature, and finally the packaging here is completed, realizing automatic packaging without re-packaging; and the cast polyethylene film has better moisture resistance, which prevents the leather powder in the bag body 1 from getting damp.

[0037] According to actual needs, multiple packaging lines (not shown in the figure) can be set on the outer peripheral surface after the outer layer of paper 50 is enclosed, and the placement of the heating clamp is assisted according to the packaging lines, so that the inner layer of paper 51 forms a sealing part 52 according to the packaging lines, so that the position of the sealing part 52 is unified.

[0038] In some preferred embodiments, the outer peripheral surface of the outer paper 50 is fixedly connected to the top of the bag body 1 and the bottom surface of the reinforcing sealing strip 4 respectively by spraying or dispensing glue.

[0039] By spraying or dispensing glue on the outer peripheral surface formed by the outer layer of paper 50 to fix the bag body 1 and the reinforcing sealing strip 4, the valve port 5 can be expanded smoothly before filling, saving expansion time and improving work efficiency.

[0040] In some preferred embodiments, the length of the overlapping portion formed by the outer paper 50 and the inner paper 51 and the top of the bag body 1 is smaller than the length of the top of the bag body 1 .

[0041] A portion of the whole formed by the outer paper 50 and the inner paper 51 is located inside the top of the bag body 1, and is used to transfer the powder in the filling machine to the inside of the bag body 1, and a portion is located outside the top of the bag body 1, and is used to connect with the filling machine. Therefore, the portion of the whole formed by the outer paper 50 and the inner paper 51 that overlaps with the top of the bag body 1 is smaller than the length of the top of the bag body 1 itself, and the center position is optimal, which facilitates the powder inside the valve port 5 to be filled from the middle position of the top of the valve body and directly fall to the inner bottom of the bag body 1.

[0042] When the utility model is used, a reinforced sealing strip 4 is provided below the top bag opening 10 to block the overlapping portion of the first folding portion 2 and the second folding portion 3, so as to prevent powder from leaking from the gap of the bag opening 10 during filling, thereby saving costs; and a double-layer structured valve opening 5 is provided, and the outer layer of paper 50 is fixedly connected to the bag body 1 and the reinforced sealing strip 4 by spraying or dispensing glue, and the inner layer of paper 51 is made of cast polyethylene film. After the powder filling is completed, a heating fixture is used to heat the outer layer of paper 50, so that the inner layer of paper 51 at the heated position is fused at high temperature to form a sealing portion 52, thereby realizing automatic packaging and high powder filling efficiency.

[0043] The above is only a preferred embodiment of the utility model and does not limit the utility model in any form. According to the technical essence of the utility model, within the spirit and principles of the utility model, any simple modification, equivalent replacement and improvement made to the above embodiment still falls within the protection scope of the technical solution of the utility model.

Claims

1. A valve bag for automatic powder filling machine, characterized in that: The invention comprises a bag body (1) with bag openings (10) at the top and bottom, wherein the bag opening (10) is formed by bending and pasting a first folding portion (2) and a second folding portion (3), a reinforcing sealing strip (4) is provided below the bent bag opening (10), a valve opening (5) with a double-layer structure is provided below the reinforcing sealing strip (4) at the top, and the outer peripheral surface of the valve opening (5) is fixedly bonded to the reinforcing sealing strip (4).

2. The valve bag for the automatic powder filling machine according to claim 1, characterized in that: The first folding portion (2) is provided with a first folding line (6), the second folding portion (3) is provided with a second folding line (7), and the width of the reinforced sealing strip (4) is greater than the distance between the first folding line (6) and the second folding line (7).

3. The valve bag for the automatic powder filling machine according to claim 1, characterized in that: The reinforced sealing strip (4) comprises a third folding portion (40) and a fourth folding portion (41), wherein the third folding portion (40) and the fourth folding portion (41) are provided with a third folding line (8) and a fourth folding line (9) which respectively overlap with the first folding portion (2) and the second folding portion (3).

4. The valve bag for the automatic powder filling machine according to claim 1, characterized in that: The surface of the reinforcing sealing strip (4) is coated with environmentally friendly glue and is bonded and fixed to the first folding portion (2) and the second folding portion (3).

5. The valve bag for the automatic powder filling machine according to claim 1, characterized in that: The valve port (5) comprises an outer layer of paper (50) and an inner layer of paper (51), wherein the inner layer of paper (51) is wound around the inner side of the outer layer of paper (50), the outer layer of paper (50) is kraft paper, and the inner layer of paper (51) is a cast polyethylene film.

6. The valve bag for the automatic powder filling machine according to claim 5, characterized in that: After the valve port (5) is heated, the top surface and the bottom surface of the inner paper (51) are fused to form a sealing portion (52).

7. The valve bag for the automatic powder filling machine according to claim 5, characterized in that: The outer peripheral surface of the outer layer of paper (50) is fixedly connected to the top of the bag body (1) and the bottom surface of the reinforcing sealing strip (4) respectively by spraying or dispensing glue.

8. The valve bag for the automatic powder filling machine according to claim 5, characterized in that: The length of the overlapping portion formed by the outer layer of paper (50) and the inner layer of paper (51) and the top of the bag body (1) is smaller than the length of the top of the bag body (1).

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