Vacuum sealing bag

Abstract

The utility model discloses a vacuum sealing bag which comprises a bag body, and the bag body comprises a wall body made of a plastic film, a bag opening formed in the top of the wall body and a bag bottom axially opposite to the bag opening. The wall body is of a circumferentially-closed continuous surface structure, and a vacuum containing cavity is defined by the inner surface of the wall body. Functional concave-convex textures are arranged on the inner surface of the wall body and continuously extend to the bag bottom from the bag opening along the inner surface of the wall body to form a gas exhaust path. The bag opening can be sealed in a hot melting mode. The utility model has the beneficial effects that the cost is greatly reduced by simplifying the process and reducing the waste of leftover materials.

Description

Technical Field

[0001] This utility model relates to the field of vacuum packaging technology, and in particular to a circumferentially closed continuous surface structure vacuum sealing bag. Background Technology

[0002] Vacuum sealing machines achieve long-term preservation of items through two core processes: vacuuming and heat sealing. The workflow is as follows: Step 1, Vacuuming: Place the vacuum sealing bag in the sealing groove and start the vacuum pump to remove air from the bag to a preset pressure or time threshold; Step 2, Heat Sealing: Use heating elements to instantly fuse the double-layer film (such as PA / PE composite material) at the bag opening, forming an airtight seal.

[0003] To achieve effective air extraction, traditional vacuum sealing bags require a textured structure at the bag opening to prevent gas passage blockage caused by adhesion between film layers. The structure of existing sealing bags is as follows: Figure 1-3 As shown, it consists of the following parts:

[0004] Smooth plastic film layer 0111: Provides basic sealing and mechanical strength;

[0005] Textured plastic film layer 0112: The inner wall of the textured plastic film layer 0112 has textures 04, and the gaps between the textured plastic film layers 0112 form a gas exhaust path.

[0006] Fusion edge 06: The edges of two layers of film are bonded together by hot pressing to form the bag body;

[0007] The smooth plastic film layer 0111 and the textured plastic film layer 0112 are joined together by the fusion edge 06 to form a vacuum cavity 015.

[0008] Existing vacuum-sealed bags have defects:

[0009] 1. Complex step-by-step manufacturing process: It is necessary to prepare smooth film and textured film separately, and carry out multiple processes such as independent cutting, lamination and edge welding, resulting in high equipment investment and labor costs;

[0010] 2. Low material utilization: When two rolls of film are processed simultaneously, uneven tension can easily lead to an increase in edge waste.

[0011] The aforementioned problems have resulted in high production costs for traditional vacuum sealing bags, which has hampered market competitiveness, especially in large-scale production scenarios. Utility Model Content

[0012] To address the shortcomings of existing technologies, this utility model proposes a novel vacuum sealing bag structure that eliminates the need for slitting and stacking processes, significantly simplifying the production process and reducing manufacturing costs.

[0013] To achieve the above objectives, the present invention provides a vacuum sealing bag, comprising:

[0014] The bag body includes a wall made of plastic film, a bag opening formed at the top of the wall, and a bag bottom axially opposite to the bag opening;

[0015] The wall is a circumferentially closed continuous surface structure, and its inner surface encloses and forms a vacuum-containing cavity;

[0016] The inner surface of the wall has a functional textured surface that extends continuously from the bag opening along the inner surface of the wall to the bottom of the bag, forming a gas discharge path.

[0017] The bag opening is heat-sealed.

[0018] Furthermore, the bottom of the bag can have any of the following structures:

[0019] a) A closed bag bottom sealed with heat fusion;

[0020] b) Open the bottom of the pocket.

[0021] Furthermore, the wall is integrally formed using a blow molding process.

[0022] Furthermore, the raised shape of the textured surface can be any one or a combination of straight stripes, diagonal straight stripes, or wavy patterns.

[0023] Furthermore, the raised height of the textured surface is 0.1-0.5 mm.

[0024] Furthermore, the raised shape of the texture (14) is a straight stripe extending along the axial direction of the bag body.

[0025] Furthermore, the width of the straight stripes is 1-3mm, and the spacing between adjacent stripes is 2-5mm.

[0026] Furthermore, the distribution area of ​​the raised texture (14) is any of the following:

[0027] a) Covering the entire area of ​​the inner surface of the wall (11);

[0028] b) Cover 20%-90% of the inner surface of the wall (11), and the non-covered area is smooth.

[0029] Furthermore, the thickness of the plastic film is 10-300 μm.

[0030] Furthermore, the plastic film has a single-layer structure and is made of polyethylene or polypropylene.

[0031] The beneficial effects of this utility model are that it can significantly reduce costs through the following methods:

[0032] 1. Simplified process flow: The vacuum sealing bag structure of this utility model can improve the existing process by making multiple steps such as preparing smooth film and textured film separately, cutting, stacking and edge welding, into one-piece molding through blow molding, thus simplifying the process;

[0033] 2. Reduce waste of scrap materials: This process eliminates the need for cutting scrap materials, thus improving material utilization and reducing waste. Attached Figure Description

[0034] Figure 1 : Front view of a prior art vacuum-sealed bag;

[0035] Figure 2 Perspective view of a vacuum-sealed bag from existing technology;

[0036] Figure 3 : A schematic diagram of the cross-section of a vacuum sealing bag (AA section) in existing technology;

[0037] Figure 4 : Schematic diagram of the vacuum sealing bag structure of Embodiment 1 of this utility model;

[0038] Figure 5 Perspective view of the vacuum sealing bag of Embodiment 1 of this utility model;

[0039] Figure 6 : A schematic diagram of the cross-section of the vacuum sealing bag AA in Embodiment 1 of this utility model;

[0040] Figure 7 : A schematic diagram of the cross-section of the vacuum sealing bag BB in Embodiment 1 of this utility model;

[0041] Figure 8 This utility model embodiment 2 illustrates the intention of using a partial oblique linear stripe covering method on the inner surface of the vacuum sealing bag wall;

[0042] Figure 9 This utility model embodiment 4 illustrates the intention of using a partial wavy textured pattern to cover the inner surface of the vacuum sealing bag wall.

[0043] Figure 10 Perspective view of the unfolded state of the vacuum sealing bag in Embodiment 5 of this utility model;

[0044] Figure 11 : Embodiment 5 of this utility model: structural diagram of the vacuum sealing bag roll material.

[0045] Figure 12 Comparison diagrams of the fused edge structure of the vacuum sealing bag of the present invention and existing technology (12a is the prior art, 12b is Example 1, 12c is Example 5).

[0046] Figure 13 Flowchart of blown film process;

[0047] Explanation of reference numerals in the attached figures:

[0048] Figure 1-3 Existing technical illustrations: smooth plastic film layer 0111, textured plastic film layer 0112, textured surface 04, fused edge 06

[0049] Figure 4-12 The illustration of this utility model shows: bag body 10, wall 11, bag opening 12, bag bottom 13, textured surface 14, and vacuum chamber 15. Detailed Implementation

[0050] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model, but this does not constitute a limitation on the scope of protection of the present utility model.

[0051] In this utility model, for clearer description, the following explanation is provided: The observer faces the attached... Figure 2 When observing, the observer's left rear is designated as front, the observer's right front as rear, the observer's left front as right, the observer's right rear as left, the observer's top as up, and the observer's bottom as down. It should be noted that the terms "front side," "rear side," "upper side," "lower side," "inner," "above," and "below" in this text indicate the orientation or positional relationship based on the accompanying drawings. These are merely for the purpose of clearly describing the present invention and do not indicate or imply that the structure or component referred to must have a specific orientation or be constructed in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used only for the purpose of clarity or simplification of description and should not be construed as indicating or implying relative importance or quantity.

[0052] Example 1: Full-area linear textured closed vacuum sealing bag

[0053] 1. Product Structure

[0054] This embodiment provides a rectangular sheet-shaped vacuum sealing bag, such as Figure 4-7 As shown,

[0055] Includes bag body 10, which is integrally formed by blow molding of linear low-density polyethylene (LLDPE) and has an overall size of 300±5mm in length and 200±3mm in width.

[0056] The structure includes:

[0057] Wall 11: The thickness is 10μm, and the wall 11 is a circumferentially closed continuous surface structure;

[0058] Bag opening 12: formed at the top of wall 11;

[0059] Bag bottom 13: Opposite to the bag opening 12 in the axis, it is a closed bag bottom that is heat-sealed.

[0060] Vacuum containment cavity 15: The surface of the wall 11 encloses and forms a vacuum sealed bag containment cavity 15.

[0061] 2. Surface texture design

[0062] The inner surface of the wall 11 is provided with a functional texture 14, wherein the texture is a straight stripe extending along the axial direction of the bag body;

[0063] The dimensions of the straight stripes are any of the following:

[0064] a) Stripe protrusion height 0.1mm, stripe width 0.5mm, and spacing between adjacent stripes 0.5mm;

[0065] b) Stripe elevation height 0.5mm, stripe width 3mm, adjacent stripe spacing 5mm

[0066] Distribution: Covers the entire inner surface of the wall.

[0067] 3. Production Process

[0068] like Figure 6 , 7 As shown, the manufacturing process of the vacuum sealing bag of this utility model includes the following steps:

[0069] Preform preparation: A mature blow molding process was employed, using linear low-density polyethylene as the raw material. A custom-designed annular die head was used to create a hollow and continuous vacuum-sealed bag preform through continuous blow molding. After flattening, the width of the preform remained stable within the range of 200±3mm.

[0070] Preform cutting: The prepared vacuum-sealed bag preform is cut into sections of 300±5mm in length to obtain sheet-like vacuum-sealed bag preforms with dimensions of 300±5mm in length and 200±3mm in width.

[0071] Bottom sealing and mouth forming: One end of the sheet-shaped vacuum sealing bag blank is heat-sealed to form a firm bottom 13; the other end remains open to form a convenient mouth 12.

[0072] 4. Performance test data

[0073] Performance testing showed that the vacuum sealing bag of this embodiment performed well in terms of heat sealing strength and tear resistance. The heat sealing strength met industry standards, and the tear resistance met the usage requirements, ensuring the reliability and durability of the sealing bag.

[0074] 5. Technical Effect Analysis

[0075] like Figure 12 As shown (12a is the prior art, 12b is the present embodiment), compared with the prior art, the vacuum sealing bag of the present invention reduces the number of fusion edges from 3 to 1, and the preform can be directly extruded into a film in one step.

[0076] a) Simplified process: The traditional process involves five steps: secondary film extrusion (smooth plastic film layer, textured plastic film layer) → slitting → lamination → heat sealing.

[0077] This utility model involves three processes: one-time film extrusion, slitting, and heat sealing.

[0078] b) Reduce waste of scrap materials:

[0079] Traditional processes generate approximately 10% scrap material during the slitting process.

[0080] This invention results in a scrap rate of approximately 0.

[0081] Example 2: Partially oblique straight-line striped closed vacuum sealing bag

[0082] 1. Product Structure

[0083] Except for the material being changed to polypropylene (PP), the wall thickness (11) of the vacuum sealing bag in this embodiment is 300μm, and the rest of the structure is the same as in Example 1. The bag body (10) is integrally formed by blow molding process, with a length of 300±5mm × width of 200±3mm. It is a circumferentially closed continuous surface structure, and the inner surface surrounds to form the vacuum sealing bag receiving cavity (15).

[0084] 2. Surface texture design

[0085] The inner surface of the wall (11) is provided with a functional raised texture (14), which adopts a diagonal straight stripe design and is composed of diagonal straight stripes. The diagonal straight stripe has one of two sizes:

[0086] a) Stripe protrusion height 0.1mm, stripe width 0.5mm, and spacing between adjacent stripes 0.5mm;

[0087] b) Stripe elevation height 0.5mm, stripe width 3mm, adjacent stripe spacing 5mm

[0088] like Figure 8 As shown, oblique straight stripes cover 20% of the inner surface of the wall, while the remaining area remains smooth.

[0089] 3. Production process

[0090] The production process is basically the same as in Example 1, but in the preform preparation stage, a special ring die head is customized according to the design requirements of the oblique straight stripes to ensure the accurate forming of the oblique straight stripes during blow molding. The preform cutting, bag bottom sealing, and bag mouth forming steps are the same as in Example 1.

[0091] 4. Performance test data

[0092] Performance testing showed that the vacuum sealing bag of this embodiment performed well in terms of heat sealing strength and tear resistance. The heat sealing strength met industry standards, and the tear resistance met the usage requirements, ensuring the reliability and durability of the sealing bag.

[0093] 5. Technical Effect Analysis

[0094] This embodiment, by employing polypropylene material and a diagonal linear stripe design, simplifies the process, reduces material waste, and optimizes the performance of the sealing bag. The heat resistance and chemical stability of polypropylene material ensure that the sealing bag maintains good performance in various environments, broadening the product's application range.

[0095] Example 3: Partially wavy textured closed vacuum sealing bag

[0096] 1. Product Structure

[0097] Except for the textured design, the vacuum sealing bag in this embodiment is identical to that in embodiment 2. The bag body (10) is made of polypropylene (PP) material and is integrally formed by blow molding. The dimensions are 300±5mm in length and 200±3mm in width. The wall (11) is 300μm thick and has a continuous circumferentially closed surface structure. The inner surface surrounds and forms the vacuum sealing bag cavity (15).

[0098] 2. Surface texture design

[0099] The inner surface of the wall (11) is provided with a functional textured surface (14), which adopts a wave-shaped pattern design. The parameters of the wave-shaped pattern are as follows:

[0100] a) The height of the wavy pattern is 0.1 mm, the width of the wavy pattern is 0.5 mm, the wavy patterns are arranged in parallel, and the center-to-center distance between adjacent wavy patterns is 0.5 mm;

[0101] b) The height of the wavy pattern is 0.5mm, the width of the wavy pattern is 3mm, the wavy patterns are arranged in parallel, and the center-to-center distance between adjacent wavy patterns is 5mm.

[0102] like Figure 9 As shown, the wavy texture covers 90% of the inner surface of the wall, while the remaining 10% remains smooth.

[0103] 3. Production process

[0104] The production process is basically the same as in Example 2, but in the preform preparation stage, a special ring die head is customized according to the design requirements of the wavy texture to ensure the precise forming of the wavy texture during blow molding. The preform cutting, bag bottom sealing, and bag mouth forming steps are the same as in Example 2.

[0105] 4. Performance test data

[0106] Performance testing showed that the vacuum sealing bag of this embodiment performed well in terms of heat sealing strength and tear resistance. The heat sealing strength met industry standards, and the tear resistance met the usage requirements, ensuring the reliability and durability of the sealing bag.

[0107] 5. Technical Effect Analysis

[0108] This embodiment utilizes a wavy texture design, which simplifies the process and reduces material waste while further optimizing the performance of the sealing bag. The wavy texture enhances the bag's flexibility and pressure resistance.

[0109] Example 4: Roll-type vacuum sealing bag

[0110] 1. Product Structure

[0111] like Figure 10-11 As shown, the main difference between the vacuum sealing bag in this embodiment and that in Embodiment 1 is:

[0112] Featuring an open-pocket bottom design, the length can be flexibly set according to the user's actual needs, without being limited by a fixed size.

[0113] The bag body (10) is integrally formed by blow molding of linear low-density polyethylene (LLDPE), and the whole is in the form of a roll with a width of 200±3mm.

[0114] 2. Surface texture design

[0115] The inner surface of the wall (11) is provided with a functional raised texture (14), which adopts a straight stripe design. The stripe parameters are:

[0116] The dimensions of the straight stripes are any of the following:

[0117] a) Stripe protrusion height 0.1mm, stripe width 0.5mm, and spacing between adjacent stripes 0.5mm;

[0118] b) Stripe elevation height 0.5mm, stripe width 3mm, adjacent stripe spacing 5mm

[0119] 3. Production process

[0120] Compared with Example 1, the production process differs in the following ways:

[0121] Preform preparation: Using mature blow molding technology and linear low-density polyethylene as raw material, a custom-designed annular die head was used to produce a hollow and continuous vacuum-sealed bag preform through continuous blow molding. After flattening, the width of the preform stabilized within the range of 200±3mm.

[0122] Preform forming: The preform is continuously extruded and cooled to form a roll material without the need for slitting and fusion.

[0123] Roll winding: The formed blank is wound into a roll of material to the required length for easy storage and transportation.

[0124] 4. Performance test data

[0125] Performance testing showed that the roll-type double-opening vacuum sealing bag of this embodiment exhibits excellent heat-sealing strength and tear resistance. The heat-sealing strength meets industry standards, and the tear resistance satisfies usage requirements, ensuring the reliability and durability of the sealing bag.

[0126] 5. Technical Effect Analysis

[0127] like Figure 12 As shown (12a is the prior art, 12c is this embodiment), compared with the prior art, the vacuum sealing bag of this utility model reduces the number of fusion edges from 3 to 0, and the preform can be directly extruded into a film in one step.

[0128] This embodiment, by employing a roll design and an open-bottom bag, simplifies the process, reduces material waste, and improves production efficiency and product applicability. The roll form facilitates large-scale production and continuous processing, while the open-bottom bag design meets the needs for quick access and flexible length in specific scenarios. Compared to Embodiment 1, this embodiment further optimizes the function and performance of the sealing bag while maintaining the advantages of material utilization and process simplification, thus expanding the product's application range.

[0129] Example 5: A blown film process for vacuum-sealed bags

[0130] 1. Process Overview

[0131] like Figure 13 As shown, the embodiment describes in detail a blown film process for vacuum sealing bags. This process is based on the design parameters of Embodiment 1 and ensures that the produced vacuum sealing bags have high quality and stable performance by precisely controlling each process step.

[0132] 2. Process parameters and steps

[0133] (a) Raw material preparation

[0134] Linear low-density polyethylene (LLDPE) is selected as the raw material, which has good flexibility, strength and processing performance, and can meet the performance requirements of vacuum sealing bags.

[0135] (b) Die head design

[0136] A ring-shaped die head was customized according to the design requirements for straight stripes in Example 1. The die head design should ensure the formation of continuous and uniform straight stripe textures during the blown film process. Specific parameters are as follows:

[0137] Stripe elevation height: 0.1mm

[0138] Stripe width: 0.5mm

[0139] Spacing between adjacent stripes: 0.5mm

[0140] (c) Extrusion and blow-up

[0141] The raw material is heated to a suitable temperature through a screw extruder to melt and plasticize it.

[0142] Molten plastic is extruded through a die to form a hollow tubular preform.

[0143] During the extrusion process, compressed air is used to inflate the preform, causing it to expand and cool to set.

[0144] (d) Cooling and traction

[0145] The embryo is cooled by a cooling device, usually a fan ring, to rapidly cool it to room temperature.

[0146] After cooling, the embryo is pulled by a traction device to control its movement speed and ensure uniform cooling and shaping.

[0147] (e) Roll up

[0148] After cooling and setting, the preform is rolled into a roll for easy subsequent slitting and processing. During the rolling process, care should be taken to maintain the flatness and uniform tension of the preform to avoid wrinkles or loosening.

[0149] 3. Key Points of Quality Control

[0150] Raw material quality: Ensure that the purity and performance of linear low-density polyethylene raw materials meet the requirements, and avoid the impact of impurities and inferior raw materials on product quality.

[0151] Temperature control: Precisely control the temperature of the extruder and die to ensure the fluidity and processing performance of the plastic melt.

[0152] Inflation ratio: By properly controlling the inflation ratio, the embryo can be fully expanded during the inflation process and form a uniform wall thickness.

[0153] Cooling effect: Ensure that the air volume and air speed of the cooling device are uniform, so that the blank can be cooled quickly and evenly, avoiding performance degradation due to insufficient cooling.

[0154] Traction speed: Adjust the traction speed appropriately according to the cooling and shaping of the embryo to ensure the dimensional stability and appearance quality of the embryo.

[0155] 4. Performance Testing and Application Verification

[0156] The vacuum bags produced are subjected to performance tests, including heat seal strength, tear resistance, and gas barrier properties, to ensure that they meet relevant standards and usage requirements.

[0157] In practical applications, the performance of the sealing bag is verified, including vacuuming and heat sealing operations on a vacuum packaging machine to check its sealing effect and reliability.

[0158] The blown film process described above can produce vacuum-sealed bags that meet the design requirements of Example 1. These bags have good sealing performance, mechanical strength, and gas barrier properties, and are suitable for vacuum packaging of food, medicine, and other items.

Claims

1. A vacuum sealing bag, characterized in that, include: The bag body (10) includes a wall (11) made of plastic film, a bag opening (12) formed on the top of the wall (11) and a bag bottom (13) axially opposite to the bag opening (12). The wall (11) is a circumferentially closed continuous surface structure, and its inner surface encloses a vacuum-containing cavity (15). The inner surface of the wall (11) has a functional textured surface (14), which extends continuously from the bag opening (12) along the inner surface of the wall (11) to the bottom of the bag (13), forming a gas discharge path. The bag opening (12) is a heat-sealed bag opening; The bottom of the bag (13) is an open bag bottom; The bag body (10) is in the form of a continuous roll.

2. The vacuum sealing bag according to claim 1, characterized in that, The wall (11) is integrally formed by blow molding.

3. The vacuum sealing bag according to claim 1, characterized in that, The raised shape of the texture (14) is any one or a combination of straight stripes, oblique straight stripes or wavy patterns.

4. The vacuum sealing bag according to claim 3, characterized in that, The raised height of the texture (14) is 0.1-0.5mm.

5. The vacuum sealing bag according to claim 4, characterized in that, The raised shape of the texture (14) is a straight stripe extending along the axial direction of the bag body.

6. The vacuum sealing bag according to claim 5, characterized in that, The width of the straight stripes is 0.5-3mm, and the spacing between adjacent stripes is 0.5-5mm.

7. The vacuum sealing bag according to claim 1, characterized in that, The distribution area of ​​the raised texture (14) is any one of the following: a) Covering the entire area of ​​the inner surface of the wall (11); b) Cover 20%-90% of the inner surface of the wall (11), and the non-covered area is smooth.

8. The vacuum-sealed bag according to any one of claims 1-2, characterized in that, The thickness of the plastic film is 10-300 μm.

9. The vacuum sealing bag according to claim 1, characterized in that, The plastic film has a single-layer structure and is made of polyethylene or polypropylene.

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