Preparation method of cylindrical self-standing pouch

Abstract

The invention discloses a preparation method of a cylindrical self-standing pouch, which at least comprises the following steps of: continuously conveying a main film material required for preparing the cylindrical self-standing pouch, and setting a folding illusion line on the main film material along the conveying direction of the main film material; conveying a bottom film material for preparing the cylindrical doypack bottom film to the position above the folding illusion line of the main film material; the main film material provided with the negative film material is folded along the folding illusion line, the folded main film material forms an overlapping part, and the folded overlapping part of the main film material is subjected to hot pressing to form an edge seal; the main film material and the bottom film material are heat-sealed to form a cylindrical self-standing pouch body, and the heat-sealed cylindrical self-standing pouch body is cut to form an independent cylindrical self-standing pouch. According to the method of the technical scheme, the cylindrical self-standing pouch structure can be effectively prepared, inner edge sealing is formed at the edge sealing position of the self-standing pouch, the pouch body can be repeatedly used for multiple times through the structure capable of being directly covered with the sealing cover, and waste of resources is avoided.

Description

Technical Field

[0001] The present invention relates to the field of packaging, and particularly to a method for preparing a cylindrical stand-up bag. Background Art

[0002] A stand-up bag refers to a flexible packaging bag with a horizontal support structure at the bottom, which can stand by itself without relying on any support. With its relatively novel packaging form, the stand-up bag has advantages in many aspects such as enhancing the product grade, strengthening the visual effect on the shelf, being portable, convenient to use, fresh-keeping and sealable, and is widely used in products such as fruit juice beverages, sports drinks, bottled drinking water, squeezable jelly, seasonings, etc. In addition to the food industry, the application of some washing products, daily cosmetics, medical supplies and other products is also gradually increasing.

[0003] When preparing the existing stand-up bags, generally the bottom film material is inserted between the upper and lower layers of film materials, and then the upper and lower layers of film materials and the bottom film material therein are transported to the heat-sealing process for heat-sealing into bags. This traditional bag-making method cannot effectively prepare cylindrical stand-up bags.

[0004] Therefore, there is an urgent need to develop a method for preparing a cylindrical stand-up bag. Summary of the Invention

[0005] The purpose of the present invention is to overcome at least one defect of the prior art and provide a method for preparing a cylindrical stand-up bag.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions: The present invention provides a method for preparing a cylindrical stand-up bag, which at least has the following steps: Continuously transport the main film material required for preparing the cylindrical stand-up bag through a film material transport mechanism, and set a folding imaginary line on the main film material along its transport direction; Transport the negative film material for preparing the bottom film of the cylindrical stand-up bag to above the folding imaginary line of the main film material through a negative film material transport mechanism; Fold the main film material provided with the negative film material along the folding imaginary line, and the folded main film material forms an overlapping part. Press the overlapping part of the folded main film material to form a side seal; Heat-seal the main film material and the negative film material to form the main body of the cylindrical stand-up bag, and cut the heat-sealed main body of the cylindrical stand-up bag to form an independent cylindrical stand-up bag.

[0007] Further explanation, when setting the folding imaginary line on the main film material, the number of folding imaginary lines is set to two. The two folding imaginary lines are respectively located at positions close to one side edge and close to the middle of the main film material, and the two folding imaginary lines are parallel to each other; the distance between the two folding imaginary lines is the same as the width of the cylindrical stand-up bag in the flat state after bag formation.

[0008] For further description, a side seal area is formed between the folding imaginary line set near one side of the main film material and its adjacent side.

[0009] For further description, before the bottom film material is conveyed to the main film material, at least the following steps are included: The bottom film material is folded along the longitudinal center line thereof by a folding mechanism; Both sides of the folded bottom film material are heat-sealed to prevent leakage; Cutting is performed longitudinally along the heat-sealed parts on both sides of the bottom film material to form a bottom film sheet material with both sides heat-sealed. The bottom film sheet material is of a square structure to prepare the bottom film of a cylindrical self-standing bag; The bottom film sheet material is conveyed above the folding imaginary line set on the main film material by a conveying mechanism.

[0010] For further description, when conveying the bottom film sheet material, the folded opening is conveyed downward onto the main film material.

[0011] For further description, after the bottom film material is folded along the center line of its longitudinal part, the folding depth is less than or equal to half of the diameter of the bottom film of the cylindrical self-standing bag after bag formation, so as to form a circular bottom film structure of the cylindrical self-standing bag.

[0012] For further description, the transverse length of the bottom film sheet material formed after cutting the bottom film material is greater than the diameter of the bottom film of the cylindrical self-standing bag after bag formation. This enables the transverse two sides of the bottom film sheet material to protrude beyond the position between the two folding imaginary lines when being conveyed to the main film material, and two protruding parts are formed outside the two folding imaginary lines. One of the protruding parts is located above the side seal area.

[0013] For further description, the heat-sealed parts on both sides of the bottom film material are located at the two protruding parts of the bottom film sheet material.

[0014] For further description, forming the side seal includes at least the following steps: The main film material is folded along the folding imaginary line located in the middle. The main film material on the right side of the middle folding imaginary line is folded to the left along the folding imaginary line and covers the part above the left side of the main film material. And the part located between the two folding imaginary lines forms a double-layer structure; The side seal area on the left side of the folding imaginary line at the side of the main film material is folded to the right and covers the upper layer of the folded double-layer structure. And the side seal area is superimposed on the part located on the upper layer after the main film material is folded; The part where the side seal area is superimposed on the upper layer of the double-layer structure is hot-pressed by a hot-pressing mechanism, and the hot-pressed part forms the side seal.

[0015] For further illustration, when folding the main film material, the order of folding along the middle folding imaginary line and along the side folding imaginary line can be arbitrarily swapped.

[0016] For further illustration, the protrusions of the bottom film sheet at the side folding imaginary line are folded at the side seal and hot-pressed synchronously.

[0017] For further illustration, when hot-pressing and sealing the bottom film sheet and the main film material, triangular hot-sealing is used to form a circular bottom film structure.

[0018] Based on the above method for preparing a cylindrical self-standing bag, the following beneficial effects are achieved: The method of this technical solution can effectively prepare a cylindrical self-standing bag structure, enabling an inner side seal to be formed at the side seal of the self-standing bag. The structure that can directly cover and seal can realize multiple repeated uses of the bag body, avoiding waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figures 1-9 is a schematic structural diagram of the process for preparing a cylindrical self-standing bag; Figure 10 is a schematic three-dimensional structural diagram of the prepared cylindrical self-standing bag; Figure 11 is a schematic structural diagram of the three-dimensional structure of the cylindrical self-standing bag with a cover sealed; REFERENCE SIGNS: 1 - bag body, 10 - bottom film, 11 - side seal; 12 - bag mouth; 13 - top cover; 20 - main film material, 201 - side seal area, 21 - bottom film material, 210 - bottom film sheet, 211a - protrusion, 211b - protrusion, 212 - sealing edge part, 213 - hot-sealing part; A1 - middle folding imaginary line, A2 - side folding imaginary line, B - cutting line; The direction of the arrow in the drawings is the folding direction of the film material. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following embodiments given in conjunction with the drawings further illustrate the specific implementation manners of the method for preparing the cylindrical self-standing bag of the present invention. The method for preparing the cylindrical self-standing bag of the present invention is not limited to the description of the following embodiments.

[0021] The embodiments of the present invention are described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar components or components with the same or similar functions from beginning to end. The embodiments described by referring to the drawings below are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0022] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, a mechanical connection, an electrical connection, a direct connection, or an indirect connection through an intermediate medium. It can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0023] In the description of the present invention, unless otherwise clearly defined and limited, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which it is habitually placed during use. It is only for the convenience of description and does not indicate that the device or component referred to must have a specific orientation. Therefore, it should not be construed as a limitation on the present invention. The first feature being "above" or "below" the second feature may include the direct contact between the first feature and the second feature, or may include the situation where the first feature and the second feature are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is lower than that of the second feature.

[0024] A method for preparing a cylindrical self-standing bag shown in this embodiment at least has the following steps: Continuously convey the main film material required for preparing the cylindrical self-standing bag through a film material conveying mechanism, and set a folding imaginary line on the main film material along its conveying direction; Convey the negative film material for preparing the bottom film of the cylindrical self-standing bag to above the folding imaginary line of the main film material through a negative film material conveying mechanism; Fold the main film material provided with the negative film material along the folding imaginary line. After folding, the main film material forms an overlapping part, and hot-press the overlapping part of the main film material after folding to form a side seal; Hot-seal the main film material and the negative film material to form the main body of the cylindrical self-standing bag, and cut the main body of the cylindrical self-standing bag after hot-sealing to form an independent cylindrical self-standing bag.

[0025] Combined with the attached Figures 1-11 For a more specific description.

[0026] Such as Figure 10As shown, it is the cylindrical self-standing bag structure to be prepared in the embodiment of the present invention. The cylindrical self-standing bag includes a bag body 1 and a bottom film 10. The bottom film 10 is arranged at the bottom of the bag body 1 to form a self-standing structure. The bag body 1 is a one-piece film material structure, and a side seal 11 is provided at the closed part of the one-piece structure of the bag body 1. After forming the bag, the bottom film 10 of the self-standing bag is a circular structure; the side seal 11 is a stacked structure of two inner and outer layers.

[0027] The following operations need to be carried out to prepare the above-mentioned cylindrical self-standing bag structure: First, prepare the film material of the bottom film 10 of the cylindrical self-standing bag: As Figure 1 shown, the negative film material 21 is folded along the median line in its longitudinal direction (the b-line direction as shown in the figure), and the folding depth is less than or equal to half of the diameter of the bottom film 10 of the cylindrical self-standing bag after forming the bag. It should be noted here that since a heat-sealing process needs to be carried out on the bottom film 10 part during the final bag forming, the heat-sealed part itself has a certain width. Therefore, there is a certain ratio between the folding depth of the negative film material 21 and the diameter of the bottom film 10 after forming the bag, and this ratio is less than or equal to one-half.

[0028] After folding the negative film material 21, the two sides of the folded negative film material 21 need to be heat-sealed as Figure 2 shown in the process, and the heat-sealed part forms a sealing edge part 212. The sealing edge part 212 can effectively prevent leakage at the bottom after forming the bag; After the heat-sealing process of the negative film material 21 is completed, as Figure 3 shown, it is cut along the longitudinal direction (the b-line direction as shown in the figure) of the sealing edge part 212 to form a bottom film sheet 210 with both sides heat-sealed to prepare the bottom film 10 of the cylindrical self-standing bag. The cutting here can be carried out with the longitudinal median line of the sealing edge part 212 as the cutting line B, or with the longitudinal outer edge line of the sealing edge part 212 as the cutting line B, as long as it is ensured that part or all of the two sealing edge parts 212 are located on the bottom film sheet 210 after cutting; the cut bottom film sheet 210 is a square structure.

[0029] Secondly, for the main film material 20 of the bag body 1, during its continuous transportation, as Figure 3 shown, two folding imaginary lines (A1, A2) are set on it for folding the main film material 20 along the two folding imaginary lines (A1, A2) during the process of preparing the self-standing bag; Two folding virtual lines (A1, A2) are respectively the side folding virtual line A2 located near one side of the main film material and the middle folding virtual line A1 located near the middle position. The two folding virtual lines (A1, A2) are parallel to each other, and their extending direction is consistent with the conveying direction of the main film material 20; the distance c between the two folding virtual lines (A1, A2) is the same as the width of the cylindrical self-standing bag in the flat state after bag forming. In this process, an edge sealing area 201 is formed between the set side folding virtual line A2 and the side of the main film material 20 adjacent thereto. The edge sealing area 201 is used to form the edge seal 11 of the cylindrical self-standing bag.

[0030] Again, as Figure 3 shown, the bottom film sheet 210 is conveyed by a conveying mechanism above the two set folding virtual lines (A1, A2) of the main film material 20 and covers the two folding virtual lines (A1, A2).

[0031] It should be noted in this process that when conveying the bottom film sheet 210, the opening of the bottom film sheet 210 after being turned over is conveyed downward onto the main film material 20.

[0032] In this process, the transverse length (i.e., the a direction shown in the figure) of the bottom film sheet 210 is greater than the diameter of the bottom film 10 of the cylindrical self-standing bag after bag forming. This enables the two transverse sides of the bottom film sheet 210 to protrude from the position between the two folding virtual lines (A1, A2) when the bottom film sheet 210 is conveyed onto the main film material 20, and two protruding parts (211a, 211b) are formed outside the two folding virtual lines (A1, A2). The sealing edge parts 212 on both sides of the bottom film sheet 210 are located at the two protruding parts (211a, 211b) of the bottom film sheet 210, and the protruding part 211b located at the side is above the edge sealing area 201.

[0033] Fourth, the edge seal 11 is prepared for the main film material 20 provided with the bottom film sheet 210. The preparation of the edge seal 11 has at least the process as Figures 4-7 shown: The main film material 20 is folded along the middle folding virtual line A1. The main film material 20 on the right side of the middle folding virtual line A1 is folded along the folding virtual line A1 in the direction of the left arrow and covers the part on the left side of the main film material 20, and the part between the two folding virtual lines (A1, A2) forms a double-layer structure. The edge sealing area 201 on the left side of the side folding virtual line A2 on the main film material 20 is folded to the right along the arrow direction and covers the upper layer of the folded double-layer structure, and the edge sealing area 201 is stacked with the part on the upper layer after the main film material 20 is folded; at this time, the protruding part 211b and the sealing edge part 212 of the bottom film sheet 210 are both located between the two-layer structure where the upper layer after the main film material 20 is folded and the edge sealing area 201 are stacked.

[0034] It should be noted that when the main film material 20 is folded, the folding order along the middle folding imaginary line A1 and along the side folding imaginary line A2 can be arbitrarily swapped.

[0035] Fifth, after the above two folds, as Figure 8 shown, the parts of the side seal area and the upper layer of the double-layer structure that are stacked are thermocompressed respectively by the thermocompression mechanism, and the thermocompressed parts form the side seal 11. The protruding part 211b of the bottom film sheet 210 located at the side folding imaginary line A2 is folded at the side seal 11, and thermocompression is carried out synchronously; and the bottom film sheet 210 and the main film material 20 are thermocompressed to form a thermosealed part 213. When thermocompressing and thermosealing the bottom film sheet 210 and the main film material 20, triangular thermosealing is adopted to form a circular bottom film structure.

[0036] Finally, the structure after the above thermosealing is cut along the cutting line B in the length direction of the cylindrical self-standing bag according to the required height, and finally a self-standing bag structure as Figure 10 shown is formed.

[0037] In this embodiment, the thermocompression and thermosealing process and the cutting process are involved. Since the thermocompression structure and its process, and the cutting structure and its process are all prior arts, the existing thermocompression structure and process flow, and the cutting structure and its process flow can all be completed, and no more details will be described here.

[0038] Combined with Figure 11 shown, a schematic diagram of a top cover provided on the cylindrical self-standing bag of this embodiment. An open bag mouth 12 is formed above the cylindrical self-standing bag, and the top cover 13 is buckled on the bag mouth 12; the top cover 13 has a cover top and a cover edge surrounding below the cover top; the cover edge of the top cover is of an inlaid type or an outer wrapping type. As shown in the figure, it is of the inlaid type, that is, the bag mouth 12 is wrapped outside the cover edge; in other embodiments, the cover edge can also be wrapped outside the bag mouth 12, and it can be selected according to needs in actual use.

[0039] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. A method for preparing a cylindrical self-standing bag, characterized in that, It has at least the following steps: Continuously convey the main film material required for preparing the cylindrical stand-up bag through the film material conveying mechanism, and set folding virtual lines on the main film material along its conveying direction; Convey the bottom film material for preparing the bottom film of the cylindrical stand-up bag to above the folding virtual line of the main film material through the bottom film material conveying mechanism; Fold the main film material provided with the bottom film material along the folding virtual line, and the folded main film material forms an overlapping part, and hot-press the overlapping part of the folded main film material to form a side seal; Hot-seal the main film material and the bottom film material to form the main body of the cylindrical stand-up bag, and cut the hot-sealed main body of the cylindrical stand-up bag to form independent cylindrical stand-up bags.

2. The method for preparing a cylindrical self-standing bag according to claim 1, characterized in that, When setting the folding virtual lines on the main film material, the number of folding virtual lines is set to two. The two folding virtual lines are respectively located at positions close to one side and close to the middle of the main film material, and the two folding virtual lines are parallel to each other; the distance between the two folding virtual lines is the same as the width of the cylindrical stand-up bag in the flat state after bag formation.

3. The method for preparing a cylindrical self-standing bag according to claim 2, characterized in that, A side seal area is formed between the folding virtual line set on the main film material close to one side and its adjacent side.

4. The method for preparing a cylindrical self-standing bag according to claim 2, characterized in that, Before the bottom film material is conveyed to the main film material, it has at least the following steps: Fold the bottom film material along its longitudinal center line through a folding mechanism; Hot-seal both sides of the folded bottom film material to prevent leakage; Cut longitudinally along the hot-sealed parts on both sides of the bottom film material to form a bottom film sheet material with both sides hot-sealed. The bottom film sheet material is a square structure to prepare the bottom film of the cylindrical stand-up bag; Convey the bottom film sheet material to above the folding virtual line set on the main film material through a conveying mechanism.

5. The method for preparing a cylindrical self-standing bag according to claim 4, characterized in that, When conveying the bottom film sheet material, the folded opening is conveyed downward onto the main film material.

6. The method for preparing a cylindrical self-standing bag according to claim 5, characterized in that, After the bottom film material is folded along the center line of its longitudinal part, the folding depth is less than or equal to half of the diameter of the bottom film of the cylindrical stand-up bag after bag formation to form the circular bottom film structure of the cylindrical stand-up bag.

7. The method for preparing a cylindrical self-standing bag according to claim 6, characterized in that, The transverse length of the bottom film sheet material formed after cutting the bottom film material is greater than the diameter of the bottom film of the cylindrical stand-up bag after bag formation, which makes the transverse sides of the bottom film sheet material protrude from the position between the two folding virtual lines when it is conveyed to the main film material, and two protruding parts are formed outside the two folding virtual lines, and one of the protruding parts is located above the side seal area.

8. The method for preparing a cylindrical self-standing bag according to claim 7, characterized in that, The hot-sealed parts on both sides of the bottom film material are located at the two protruding parts of the bottom film sheet material.

9. The method for preparing a cylindrical self-standing bag according to claim 3, characterized in that, Forming the side seal has at least the following steps: Fold the main film material along the folding virtual line located in the middle. The main film material on the right side of the folding virtual line in the middle is folded to the left along the folding virtual line and covers the part on the left side of the main film material, and the part between the two folding virtual lines forms a double-layer structure; Fold the side seal area on the left side of the folding virtual line on the side of the main film material to the right, covering the upper layer of the folded double-layer structure, and the side seal area is superimposed on the part of the main film material located on the upper layer after folding; Hot-press the superimposed part of the side seal area and the upper layer of the double-layer structure through a hot-pressing mechanism, and the hot-pressed part forms a side seal; When folding the main film material, the order of folding along the middle folding virtual line and folding along the side folding virtual line can be arbitrarily switched.

10. The method for preparing a cylindrical self-standing bag according to claim 9, characterized in that, When hot pressing and sealing the negative film material and the main film material, triangular hot sealing is used to form a circular bottom film structure.

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