Reverse inner port sealing structure of valve port bag and manufacturing process thereof

Abstract

The application relates to the field of valve bags, in particular to a reverse inner port sealing structure of a valve bag and a manufacturing process thereof, which comprises a bag body top sealing part used for sealing the top of the valve bag; a valve port piece installed on the bag body top sealing part, the valve port piece being used for powder filling; and an expansion piece arranged on the inner side of the bag body top sealing part, one side of the expansion piece being provided with an expansion part used for expanding and plugging the powder inlet end of the valve port piece. The application has the effects of improving the powder leakage of the valve port and improving the sealing performance of the valve bag.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of valve bags, in particular to a reverse inner port sealing structure of a valve bag and a manufacturing process thereof. BACKGROUND

[0002] The valve bag, commonly known as the bottom bag, is an internationally popular packaging bag. It is filled from the top or bottom valve port, uses a special filling device, and is packed into a square shape after filling. It is neat and beautiful, and belongs to the environmental protection bag.

[0003] In the related art, the upper bottom of the valve bag body is provided with a filling port, the valve bag body is folded from an inner film layer and a paper outer layer, the upper bottom and the lower bottom of the valve bag body are both provided with a reinforcing layer, the filling sleeve is arranged on the reinforcing layer in the upper bottom, and a hot melt glue ring is arranged on the outer end of the filling port.

[0004] However, the related art has the following problems: when the valve bag of the related art is filled with powder, a pipeline for filling powder is inserted into the valve bag from the filling port for powder filling. When the filling is completed, the pipeline is pulled out for sealing. However, the side wall of the pipeline is easy to adhere to powder, and in the process of pulling out, the powder is easy to adhere to the inner wall of the filling port, so that the hot melt glue ring cannot be well sealed due to the influence of the powder in the process of sealing, and thus the filling port is cracked and powder leakage occurs during storage. SUMMARY

[0005] In order to improve the valve port powder leakage and improve the sealing performance of the valve bag, the present application provides a reverse inner port sealing structure of a valve bag and a manufacturing process thereof.

[0006] In a first aspect, the reverse inner port sealing structure of the valve bag provided by the present application adopts the following technical scheme:

[0007] A reverse inner port sealing structure of a valve bag, comprising a bag body top sealing part for sealing the top of the valve bag; a valve port piece mounted on the bag body top sealing part, the valve port piece being used for powder filling; an expansion piece arranged on the inner side of the bag body top sealing part, and the expansion piece being provided with an expansion part on the side facing the valve port piece, the expansion part being used for expanding and plugging the powder inlet end of the valve port piece.

[0008] By using the above technical scheme, in the process of filling powder, the expansion part of the expansion piece is expanded to expand and plug the powder inlet end of the valve port piece, so that the powder inlet end of the valve port piece can be plugged after the powder filling is completed, the sealing performance of the valve bag is improved, and the problem of powder leakage at the valve port position is improved.

[0009] Preferably, the inflation member is an inner mouth paper layer, the inflation portion is a powder storage portion, the powder storage portion is arranged on a side of the inner mouth paper layer facing the valve port member, and the powder storage portion is used for storing powder.

[0010] By adopting the above technical scheme, in the powder filling process, the powder storage portion can collect and store part of the powder, so that the powder storage portion is inflated until the powder filling is completed and the powder filling end of the valve port member is blocked, thereby realizing the function of the inflation portion for inflating and blocking the powder filling end of the valve port member.

[0011] Preferably, the inner mouth paper layer is provided with an inner folding line, and the inner mouth paper layer is folded along the inner folding line to form the powder storage portion.

[0012] By adopting the above technical scheme, in the process of manufacturing the valve port bag, the inner mouth paper layer is folded along the inner folding line to form the powder storage portion, thereby realizing the function of the powder storage portion for storing powder.

[0013] Preferably, the inner mouth paper layer is arranged along the width direction of the bag body top sealing portion, and the length of the arrangement of the inner mouth paper layer is greater than the width of the bag body top sealing portion.

[0014] By adopting the above technical scheme, the arrangement of the inner mouth paper layer can be folded in cooperation with the bag body top sealing portion in the process of manufacturing the valve port bag, thereby improving the stability of the arrangement of the inner mouth paper layer and being conducive to forming the powder storage portion.

[0015] Preferably, the powder storage portion is provided with a powder limiting position, and the powder limiting position is used for limiting the powder from separating from the powder storage portion.

[0016] By adopting the above technical scheme, the arrangement of the powder limiting position can limit the powder from separating from the powder storage portion, thereby improving the stability of the powder storage portion for storing powder, and further enabling the powder storage portion to stably inflate in the powder filling process.

[0017] Preferably, the powder storage portion is provided with a folding line, and the powder limiting position is formed by folding the powder storage portion along the folding line.

[0018] By adopting the above technical scheme, in the process of manufacturing the valve port bag, the powder limiting position is formed by folding along the folding line, thereby realizing the function of the powder limiting position for limiting the powder from separating from the powder storage portion.

[0019] In a second aspect, the application provides a manufacturing process of a reverse inner mouth sealing structure of a valve port bag, which adopts the following technical scheme:

[0020] A manufacturing process of a reverse inner mouth sealing structure of a valve port bag, comprising the following steps,

[0021] Step one: preparing raw material paper;

[0022] Step two: wrapping and bonding the raw material paper to form a valve port bag body with a rectangular cross section;

[0023] Step three: the top of the valve pocket body is provided with a pocket top sealing part, the pocket top sealing part is provided with a first sealing part, a second sealing part, a third sealing part and a fourth sealing part, and the first sealing part and the second sealing part are fixed by being folded opposite to each other;

[0024] Step four: a valve port piece and an expansion piece are respectively fixed at the positions of the first sealing part and the second sealing part;

[0025] Step five: the third sealing part and the fourth sealing part are fixed by being folded opposite to each other.

[0026] Preferably, in step four, the valve port piece is first fixed outside the first sealing part, and then the expansion piece is fixed inside the second sealing part, and the expansion part of the expansion piece is partially overlapped with the valve port piece.

[0027] Preferably, in step five, the fourth sealing part is first folded and fixed with the first sealing part and the second sealing part, and the expansion part is fixed with the fourth sealing part, and then the third sealing part is lap-fixed on the fourth sealing part, and the third sealing part is fixed with the fourth sealing part, the first sealing part and the second sealing part, and the expansion part is fixed with the third sealing part.

[0028] Preferably, in step five, an edge sealing layer is fixed at the top of the pocket top sealing part.

[0029] In summary, the present application has at least one of the following beneficial technical effects:

[0030] 1. In the process of filling, the expansion of the expansion part of the expansion piece can expand and block the powder inlet end of the valve port piece, so that the powder inlet end of the valve port piece can be blocked when the filling is completed, the sealing performance of the valve pocket is improved, and the problem of powder leakage at the valve port position is improved;

[0031] 2. The setting of the powder limiting position can limit the powder from separating from the powder storage part, so as to improve the stability of the powder storage part for storing powder, and further enable the powder storage part to stably expand during the filling process;

[0032] 3. The folding of the first sealing part, the second sealing part, the third sealing part and the fourth sealing part to fix the valve port piece and the expansion piece, so as to realize the structural setting of the pocket top sealing part, so that the powder inlet end of the valve port piece can be blocked when the filling is completed, the sealing performance of the valve pocket is improved, and the problem of powder leakage at the valve port position is improved. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is the state diagram of the pocket top sealing part after being opened in the present application.

[0034] Figure 2 isFigure 1 Enlarged view of part A.

[0035] Figure 3 is another embodiment structure diagram of the powder storage part of the present application.

[0036] Figure 4 is Figure 1 Enlarged view of part B.

[0037] Figure 5 is to show the specific layered structure in the third sealing part and the fourth sealing part of the present application.

[0038] Figure 6 is the state diagram of the bag top sealing part after sealing of the present application.

[0039] Reference signs: 1, bag top sealing part; 2, valve piece; 21, inner liner paper layer; 22, film layer; 23, outer folding line; 3, expansion piece; 31, expansion part; 32, inner folding line; 33, powder limiting position; 34, folding line; 4, first sealing part; 5, second sealing part; 6, third sealing part; 7, fourth sealing part; 8, first paper separation layer; 9, second paper separation layer; 10, third paper separation layer; 11, film separation layer; 12, edge sealing layer. DETAILED DESCRIPTION

[0040] The following will be described in detail with reference to the accompanying drawings. Figures 1-6 The present application will be further described in detail.

[0041] In a first aspect, the embodiments of the present application disclose a reverse inner port sealing structure of a valve port bag. Referring to Figure 1 The reverse inner port sealing structure of the valve port bag comprises a bag top sealing part 1 for closing the top of the valve port bag; a valve piece 2, the valve piece 2 is installed on the bag top, and the valve piece 2 is used for powder filling; an expansion piece 3, the expansion piece 3 is arranged on the inner side of the bag top sealing part 1, and the expansion piece 3 is provided with an expansion part 31 on the side facing the valve piece 2, and the expansion part 31 is used for expanding and plugging the powder filling end of the valve piece 2.

[0042] Referring to Figure 1 The bag top sealing part 1 comprises a first sealing part 4, a second sealing part 5, a third sealing part 6 and a fourth sealing part 7. The first sealing part 4 and the second sealing part 5 are arranged opposite to each other, and the third sealing part 6 and the fourth sealing part 7 are arranged opposite to each other. The valve piece 2 is glued between the first sealing part 4, the third sealing part 6 and the fourth sealing part 7.

[0043] Referring to Figure 1 and Figure 2, the inflation part 3 is an inner opening paper layer, and the inflation part 31 is correspondingly arranged as a powder hiding part. The powder hiding part is arranged on the side of the inner opening paper layer facing the valve port part 2, and is used for hiding powder. Specifically, the inner opening paper layer is glued and fixed on the inner side of the second sealing part 5. The inner opening paper layer is provided with an inner folding line 32, and the inner opening paper layer is folded along the inner folding line 32 to form the powder hiding part.

[0044] In order to improve the setting stability of the valve port paper layer, the setting length of the inner opening paper layer along the width direction of the bag top sealing part 1 is greater than the width of the bag top sealing part 1. Specifically, the two ends of the inner opening paper layer along the width direction of the bag top sealing part 1 are arranged to extend into the third sealing part 6 and the fourth sealing part 7, respectively. In the process of making, by arranging the two ends of the inner opening paper layer to extend into the third sealing part 6 and the fourth sealing part 7, respectively, the two ends of the inner opening paper layer can be folded and fixed together in the process of folding the third sealing part 6 and the fourth sealing part 7, thereby improving the setting stability of the inner opening paper layer, and at the same time, cooperating with the folded powder hiding part, the setting stability of the powder hiding part is improved when the powder hiding part is formed.

[0045] Referring to Figure 1 and Figure 3 , in order to improve the stability of the powder hiding part in hiding powder, optionally, in the embodiment, the powder hiding part is provided with a powder limiting part 33, which is used for limiting the powder from leaving the powder hiding part. Specifically, the powder hiding part is provided with a folding line 34, and the powder hiding part is folded along the folding line 34 to form the powder limiting part 33.

[0046] In the process of filling powder, the inventor found that during the process of filling powder by using high-speed air pressure to pump the powder into the valve port bag, part of the airflow will flow into the powder hiding part to be retained, thereby realizing the effect of the powder hiding part being inflated by hiding powder. However, since the airflow will flow rapidly in the bag during the process of filling powder, in fact, the powder entering the powder hiding part will also flow away under the action of the airflow, resulting in the problem that the retention rate of the powder in the powder hiding part is not high, and further resulting in the problem that the sealing effect of the powder hiding part on the valve port part 2 is poor. Therefore, by arranging the powder limiting part 33, the rapidly flowing airflow can be intercepted, thereby using the powder limiting part 33 to flow part of the powder in the powder hiding part during the process of filling powder, and improving the powder hiding effect of the powder hiding part.

[0047] Optionally, the length of the powder limiting part 33 is half of the length of the powder hiding part, and in the process of filling powder, the powder limiting part 33 with a length of half of the powder hiding part can partially intercept the powder in advance, and will not cause the powder hiding part to complete the powder hiding action in advance, resulting in the situation that the powder hiding part seals the valve port part 2 before the bag is filled.

[0048] Referring to Figure 4The valve port piece 2 comprises an inner liner paper layer 21 and a film layer 22. The film layer 22 is arranged between the inner liner paper layer 21 and the bag top sealing part 1, and the setting length of the film layer 22 along the length direction of the bag top sealing part 1 is greater than the setting length of the inner liner paper layer 21 along the length direction of the bag top sealing part 1.

[0049] Further, the inner liner paper layer 21 is provided with an outer folding line 23. The inner liner paper layer 21 is folded along the outer folding line 23 to form a protection part. The film layer 22 is folded outside along the outer folding line 23 of the inner liner paper layer 21. The folding of the inner liner paper layer 21 and the film layer 22 can increase the thickness of the inner liner paper layer 21 at the valve port position, thereby prolonging the service life of the inner liner paper layer 21 and protecting the film layer 22.

[0050] With reference to Figure 5 The bag top sealing part 1 comprises a first paper separation layer 8, a second paper separation layer 9, a third paper separation layer 10 and a film separation layer 11. The first paper separation layer 8, the film separation layer 11, the second paper separation layer 9 and the third paper separation layer 10 are sequentially arranged from inside to outside, thereby improving the overall strength of the bag and preventing the bag from being damaged during use or transportation. In addition, the film separation layer 11 can prevent water vapor from entering the bag, thereby preventing the powder in the bag from being damaged by water vapor.

[0051] With reference to Figure 5 The first paper separation layer 8, the second paper separation layer 9 and the third paper separation layer 10 in the third sealing part 6 are arranged in a stepped increasing staggered manner, and the film separation layer 11 in the third sealing part 6 is aligned and overlapped with the second paper separation layer 9. Correspondingly, the first paper separation layer 8 and the film separation layer 11 in the fourth sealing part 7 are arranged in a stepped decreasing staggered manner, and the film separation layer 11, the second paper separation layer 9 and the third paper separation layer 10 in the fourth sealing part 7 are aligned and overlapped.

[0052] Further, the third paper separation layer 10 in the third sealing part 6 extends an extension segment. When the third sealing part 6 is folded and overlapped on the fourth sealing part 7, the extension segment is pasted to the third paper separation layer 10 in the fourth sealing part 7, thereby further improving the bonding stability between the third sealing part 6 and the fourth sealing part 7, and improving the sealing stability of the bag top sealing part 1.

[0053] With reference to Figure 6 In order to improve the overall stability of the bag top sealing part 1, an edge sealing layer 12 is fixedly arranged at the top of the bag top sealing part 1. The edge sealing layer 12 is used to cover the top of the bag top sealing part 1, thereby protecting the structure of the bag top sealing part 1 and improving the overall structural stability of the bag top sealing part 1.

[0054] In a second aspect, the application discloses a manufacturing process of a reverse inner port sealing structure of a valve port bag.

[0055] Step one: prepare the raw material paper;

[0056] Prepare the first paper layer 8, the second paper layer 9, the third paper layer 10 and the film layer 11 respectively, wrap the film layer 11 outside the first paper layer 8, wrap the second paper layer 9 outside the film layer 11, and wrap the third paper layer 10 outside the second paper layer 9.

[0057] Step two: roll and bond the raw material paper to form a valve bag body with a rectangular cross section;

[0058] Use glue to fix the first paper layer 8, the second paper layer 9, the third paper layer 10 and the film layer 11.

[0059] Step three: set the top of the valve bag body as a bag top sealing part 1, the bag top sealing part 1 is provided with a first sealing part 4, a second sealing part 5, a third sealing part 6 and a fourth sealing part 7, and the first sealing part 4 and the second sealing part 5 are fixed by opposite folding;

[0060] Step four: fix the valve port 2 and the expansion piece 3 at the positions of the first sealing part 4 and the second sealing part 5 respectively;

[0061] In step four, the valve port 2 is first fixed and arranged outside the first sealing part 4, and then the expansion piece 3 is fixed and arranged inside the second sealing part 5, and the expansion part 31 of the expansion piece 3 is partially arranged at the valve port 2.

[0062] Step five: fold and fix the third sealing part 6 and the fourth sealing part 7 opposite to each other.

[0063] In step five, the fourth sealing part 7 is first folded and fixed with the first sealing part 4 and the second sealing part 5, and the expansion part 31 is fixed with the fourth sealing part 7, and then the third sealing part 6 is lap-jointed and fixed on the fourth sealing part 7, the third sealing part 6 is fixed with the fourth sealing part 7, the first sealing part 4 and the second sealing part 5, and the expansion part 31 is fixed with the third sealing part 6.

[0064] In step five, the edge sealing layer 12 is fixed at the top of the bag top sealing part 1. In this embodiment, the edge sealing layer 12 is made of white kraft paper, which can not only seal the top of the bag top sealing part 1 as a whole to further improve the sealing performance of the top of the bag top sealing part 1, but also ensure the printing effect.

[0065] First, the first sealing part 4 and the second sealing part 5 are folded towards opposite directions; then the valve part 2 is pasted outside the first sealing part 4, the inner mouth paper layer is glued and fixed inside the second sealing part 5, and the two ends of the valve part 2 are respectively pasted inside the third sealing part 6 and the fourth sealing part 7 after being spread flat; finally, the third sealing part 6 and the fourth sealing part 7 are folded towards opposite directions, at this time, the two ends of the third sealing part 6 and the fourth sealing part 7 are respectively glued and fixed with the corresponding first sealing part 4 and the second sealing part 5, and the end of the third sealing part 6 is overlapped and fixed on the fourth sealing part 7 to seal the top of the bag. At the same time, the two ends of the valve part 2 are overlapped and fixed with the folding of the third sealing part 6 and the fourth sealing part 7 to provide a pipeline for powder filling.

[0066] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A reverse inner spout seal structure for a valve pocket, characterized by: The valve bag comprises a bag top sealing part (1) for sealing the top of the valve bag, a valve part (2) installed on the bag top sealing part (1), the valve part (2) is used for powder filling, an expansion part (3) arranged on the inner side of the bag top sealing part (1), and an expansion part (31) arranged on the side of the expansion part (3) facing the valve part (2), the expansion part (31) is used for expanding to block the powder inlet of the valve part (2). The expansion part (3) is an inner opening paper layer, the expansion part (31) is a powder hiding part, the powder hiding part is arranged on the side of the inner opening paper layer facing the valve part (2), and the powder hiding part is used for hiding powder. The setting length of the inner opening paper layer along the width direction of the bag top sealing part (1) is greater than the width of the bag top sealing part (1). The inner opening paper layer is provided with an inner folding line (32), and the inner opening paper layer is folded along the inner folding line (32) to form the powder hiding part. The powder hiding part is provided with a powder limiting part (33), and the powder limiting part (33) is used for limiting the powder from separating from the powder hiding part. The powder hiding part is provided with a folding line (34), and the powder hiding part is folded along the folding line (34) to form the powder limiting part (33). The length of the powder limiting part (33) is half of the length of the powder hiding part.

2. A manufacturing process of a reverse inner mouth seal structure of a valve port bag, applied to the reverse inner mouth seal structure of any one of claim 1, characterized in that: The method comprises the following steps: Step 1: preparing raw material paper; Step 2: wrapping and bonding the raw material paper to form a valve bag body with a rectangular cross section; Step 3: the top of the valve bag body is provided with a bag top sealing part (1), the bag top sealing part (1) is provided with a first sealing part (4), a second sealing part (5), a third sealing part (6) and a fourth sealing part (7), and the first sealing part (4) and the second sealing part (5) are fixed by being folded opposite to each other; Step 4: fixing the valve part (2) and the expansion part (3) at the positions of the first sealing part (4) and the second sealing part (5) respectively; Step 5: folding and fixing the third sealing part (6) and the fourth sealing part (7) opposite to each other.

3. The process of claim 2, wherein: In step 4, the valve part (2) is first fixed on the outer side of the first sealing part (4), and then the expansion part (3) is fixed on the inner side of the second sealing part (5), and the expansion part (31) of the expansion part (3) is partially overlapped with the valve part (2).

4. The process of claim 2, wherein: In step 5, the fourth sealing part (7) is first folded and fixed with the first sealing part (4) and the second sealing part (5), and the expansion part (31) is fixed with the fourth sealing part (7), and then the third sealing part (6) is overlapped and fixed on the fourth sealing part (7), and the third sealing part (6) is fixed with the fourth sealing part (7), the first sealing part (4) and the second sealing part (5), and the expansion part (31) is fixed with the third sealing part (6).

5. The process of claim 2, wherein: In step 5, an edge sealing layer (12) is fixed on the top of the bag top sealing part (1).

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