A double-layered structure packaging bag with invisible tear line and a method for manufacturing the same

Abstract

The application discloses a double-layer structure and a packaging bag with invisible tear lines and a preparation method thereof, wherein the double-layer structure and the packaging bag with invisible tear lines comprise a bag body; one end of the bag body is sealed, the other end is open, and the bag body is provided with a first film layer and a second film layer; wherein an intermittent discontinuous tear line is arranged on the first film layer or the second film layer to form a tear strip; the double-layer bag body is formed by gluing and compounding the first film layer and the second film layer, the tear line is arranged on one of the film layers to form the tear strip, the tear line is covered by the other film layer, the tear line appears in an invisible state from the outside of the packaging bag, no hole directly connected with the outside is formed on the bag body, dust, bacteria, pests and the like in the outside are effectively prevented from entering the bag body, the sanitary safety of the packaging is improved, and the anti-burst performance and the overall sealing performance of the packaging bag are obviously improved.

Description

Technical Field

[0001] This invention relates to the field of packaging bag technology, specifically to a double-layered packaging bag with an invisible tear line and its preparation method. Background Technology

[0002] Currently, most personal care products such as sanitary napkins use single-layer film bags for packaging. To make it easier for users to remove the contents, these bags usually have tear lines on the bag body, allowing users to directly tear open the bag along the tear lines and remove the sanitary napkins inside.

[0003] However, the above-mentioned single-layer packaging bags with tear lines have obvious shortcomings: on the one hand, the tear lines will form holes or weak points on the bag body that are easy to crack, resulting in a decrease in the sealing performance of the packaging bag. Dust, bacteria, pests and other external factors can easily enter the bag body through the tear lines, contaminating sanitary napkins and other products and affecting their hygiene and safety; on the other hand, when this type of packaging bag is inflated and opened by automated packaging, the weak structure at the tear lines is prone to rupture due to the internal air pressure, causing the packaging bag to burst, affecting the integrity and aesthetics of the packaging, and also causing inconvenience to production.

[0004] In view of this, there is an urgent need for a new type of packaging bag structure that can retain the convenience of tearing and opening while avoiding direct connection between the tear line and the outside world, and improving the sealing and burst resistance of the packaging bag, so as to overcome the defects of the existing technology. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of the embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] Therefore, the purpose of this invention is to provide a packaging bag with a double-layer structure and an invisible tear line, and a method for preparing the same, in order to solve the problems mentioned in the background art.

[0007] To address the aforementioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution:

[0008] A double-layered packaging bag with an invisible tear line, comprising: a bag body;

[0009] The bag is sealed at one end and open at the other end, and the bag has a first film layer and a second film layer;

[0010] In this process, discontinuous tear lines are provided on the first or second film layer to form tear strips.

[0011] As a preferred embodiment of the double-layer structure and invisible tear line of the packaging bag described in this invention, the first film layer and the second film layer are coated with adhesive to form the bag body.

[0012] As a preferred embodiment of the double-layered packaging bag with invisible tear lines described in this invention, the first film layer and / or the second film layer are made of polypropylene film material / polyethylene film material.

[0013] As a preferred embodiment of the double-layer structure and invisible tear strip of the present invention, one end of the tear strip is connected to an adhesive label, the rear half of the adhesive label is adhered to the surface of the bag body, and the front half is separated from the surface of the bag body.

[0014] A method for preparing a double-layered packaging bag with an invisible tear line, comprising the following steps:

[0015] S1. Select a first film layer and a second film layer that can be coated and laminated, wherein the film layer is made of polypropylene film material or polyethylene film material;

[0016] S2. The first thin film layer and the second thin film layer are bonded together by an adhesive coating process to form a double-layer composite film.

[0017] S3. On the first or second film layer, discontinuous tear lines are processed along a preset path to form a tear strip that can be torn along the tear lines.

[0018] S4 cuts the double-layer composite film to the set size, folds or butts it, and heat-seals both sides to form a bag with one end sealed and the other end open.

[0019] As a preferred embodiment of the method for preparing a double-layered packaging bag with an invisible tear line according to the present invention, after step S3, step S4 is further included: attaching an adhesive label to one end of the tear strip, and adhering the rear half of the adhesive label to the surface of the bag body and separating the front half from the surface of the bag body.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. The double-layered packaging bag with an invisible tear line provided by the present invention has a double-layered bag body formed by coating and bonding a first film layer and a second film layer. The tear line is set on one of the film layers to form a tear strip, so that the tear line is covered by the other film layer. The tear line is invisible when viewed from the outside of the packaging bag, and no hole is formed on the bag body that directly connects to the outside. This effectively prevents external dust, bacteria, pests and other things from entering the bag body, improving the hygiene and safety of the packaging. At the same time, the double-layered composite structure can jointly withstand the internal air pressure when inflated, avoiding the tear line from cracking and bursting due to concentrated air pressure, which significantly improves the burst resistance and overall sealing performance of the packaging bag.

[0022] 2. One end of the tear strip has an adhesive sticker. The back half of the adhesive sticker is attached to the surface of the bag, while the front half is separate from the surface of the bag. Users can easily pinch the front half of the adhesive sticker and apply force to tear the bag smoothly along the tear line. This design balances ease of opening with packaging protection, making it particularly suitable for occasions where packaging requirements for personal hygiene products, such as sanitary napkins, are high. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0024] Figure 1 This is a schematic diagram of the first direction of a packaging bag with a double-layer structure and an invisible tear line according to the present invention.

[0025] Figure 2 This is a schematic diagram of the second direction of a packaging bag with a double-layer structure and an invisible tear line according to the present invention. Detailed Implementation

[0026] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] Example 1

[0028] like Figure 1 and Figure 2As shown, this embodiment provides a double-layered packaging bag with an invisible tear line, including a bag body 10. The bag body 10 is formed by bonding a first film layer 100 and a second film layer 200 together using an adhesive bonding process. The two films together constitute a double-layered composite film structure. The first film layer 100 and / or the second film layer 200 can be made of polypropylene (PP) film or polyethylene (PE) film, which has good heat-sealing properties, flexibility, and hygiene safety, making it particularly suitable for packaging personal care products such as sanitary napkins.

[0029] One end of the bag body 10 is a heat-sealed end, and the other end is an open end for taking out and putting in the contents. When forming the bag body 10, the double-layer composite film with the required width is first cut according to the set size, and then the film is folded in half (or the two pieces are joined together), and the two sides are heat-sealed to form a bag body 10 with one end sealed and the other end open.

[0030] To achieve an easy-to-open tear structure, discontinuous tear lines A are processed along a preset path on the first film layer 100 (or the second film layer 200), forming a tear strip B that can be torn along tear line A. Since tear line A is only set in one of the two film layers, while the other film layer remains intact and covers tear line A, tear line A appears "invisible" when viewed from the outside of the packaging bag, and no hole directly communicating with the outside is formed on the bag.

[0031] As a preferred embodiment, one end of the tear strip B is connected to an adhesive label 300. The rear half of the adhesive label 300 is adhered and fixed to the surface of the bag body 10, while the front half is separated from the surface of the bag body 10 and raised up for easy gripping by the user's fingers. When opening the packaging bag, the user pinches the front half of the separated adhesive label 300 and applies force to easily tear the tear strip B along the tear line A, thereby conveniently opening the bag body 10 and taking out products such as sanitary napkins inside.

[0032] In the above structure, the tear line A can be formed by conventional discontinuous processing methods in the art, such as dotted line cutting, half cutting, laser engraving or punching. Its extension path can be preset as a straight line, arc or other suitable shape according to the shape of the bag body 10 and the opening requirements. The present invention does not limit this.

[0033] Example 2

[0034] This embodiment further describes the double-layer structure and its stealth capability based on Embodiment 1 described above.

[0035] A method for preparing a tear-line packaging bag includes the following steps:

[0036] S1. Material preparation: Select a first film layer 100 and a second film layer 200 that can be coated and laminated. The film layers are made of polypropylene film material or polyethylene film material.

[0037] S2, Adhesive Coating and Lamination: The first film layer 100 and the second film layer 200 are bonded together by an adhesive coating and lamination process to form a double-layer composite film;

[0038] S3. Forming tear lines: On the first film layer 100 or the second film layer 200, discontinuous tear lines A are processed along a preset path to form tear strips B that can be torn along tear lines A.

[0039] S4. Bag making: Cut the double-layer composite film to the set size, fold or butt it, and heat seal both sides to form a bag 10 with one end sealed and the other end open.

[0040] S5. Processing self-adhesive labels: Attach self-adhesive label 300 to one end of the tear strip B, and stick the rear half of self-adhesive label 300 to the surface of the bag body 10 and separate the front half from the surface of the bag body 10.

[0041] The packaging bag prepared by the above method has its tear line A hidden by another film, which not only retains the convenience of tearing and opening, but also avoids direct connection between the tear line and the outside world, effectively improving the sealing, hygiene and safety and burst resistance of the packaging bag.

[0042] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, as long as there is no structural conflict, the features in the disclosed embodiments can be combined with each other in any manner. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A packaging bag with a double-layer structure and an invisible tear line, characterized in that, include: Bag body (10); The bag (10) is sealed at one end and open at the other end, and the bag (10) has a first film layer (100) and a second film layer (200). In this process, discontinuous tear lines (A) are provided on the first film layer (100) or the second film layer (200) to form tear strips (B).

2. The packaging bag with a double-layer structure and an invisible tear line according to claim 1, characterized in that, The first film layer (100) and the second film layer (200) are coated with adhesive to form the bag body (10).

3. A packaging bag with a double-layer structure and an invisible tear line according to claim 1, characterized in that, The first film layer (100) and / or the second film layer (200) are made of polypropylene film material / polyethylene film material.

4. A packaging bag with a double-layer structure and an invisible tear line according to claim 1, characterized in that, One end of the tear strip (B) is connected to an adhesive sticker (300). The rear half of the adhesive sticker (300) is adhered to the surface of the bag body (10), while the front half is separated from the surface of the bag body (10).

5. A method for preparing a double-layered packaging bag with an invisible tear line as described in any one of claims 1-4, characterized in that, The steps are as follows: S1. Select a first film layer (100) and a second film layer (200) that can be coated and laminated, wherein the film layer is made of polypropylene film material or polyethylene film material; S2. The first thin film layer (100) and the second thin film layer (200) are bonded together by an adhesive bonding process to form a double-layer composite film. S3. On the first film layer (100) or the second film layer (200), discontinuous tear lines (A) are processed along a preset path to form a tear strip (B) that can be torn along the tear line (A). S4 After cutting the double-layer composite film to the set size, fold it in half or butt it together, and heat seal both sides to form a bag (10) with one end sealed and the other end open.

6. The method for preparing a double-layered packaging bag with an invisible tear line according to claim 5, characterized in that, After step S3, step S4 is also included: attaching an adhesive label (300) to one end of the tear strip (B), and sticking the rear half of the adhesive label (300) to the surface of the bag body (10) and separating the front half from the surface of the bag body (10).

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