Plastic valve bag for food packaging

Abstract

The utility model belongs to the technical field of valve bags, and discloses a plastic valve bag for food packaging, which comprises a bag body, the top and the bottom of the bag body are respectively provided with a bag top opening and a bag bottom opening, the upper part of the bag top opening is provided with a rectangular top sticker for sealing, and the top sticker is provided with six layers. The top pasting layers comprise a first top pasting layer, a second top pasting layer, a third top pasting layer, a fourth top pasting layer, a fifth top pasting layer and a sixth top pasting layer from inside to outside; a valve port structure is arranged on one side of the bag bottom opening; a rectangular bottom sticker for sealing is arranged outside the opening of the bag bottom, and the bottom sticker is provided with three layers, namely a first bottom sticker layer, a second bottom sticker layer and a third bottom sticker layer from inside to outside. The packaging bag is easy to open, does not generate plastic scraps, and ensures the safety of food in the bag.

Description

Technical Field

[0001] This utility model belongs to the field of valve bag technology, specifically relating to a plastic valve bag for food packaging. Background Technology

[0002] Valve bags, commonly known as glued-bottom bags, are currently popular multi-functional packaging bags internationally. They are filled through a valve on one side of the top of the bag using specialized filling equipment. After filling, the bags are rectangular, making them aesthetically pleasing and neatly stacked, and convenient for transportation.

[0003] Current plastic valve bags are usually made of polyethylene (PE) or polypropylene (PP) plastic woven fabric (hereinafter referred to as woven fabric). The top and bottom seals are made of woven fabric. Hot air is blown onto the surface of the woven fabric, causing the surface of the woven fabric to melt and then seal the opening.

[0004] However, existing plastic valve bags on the market require scissors to cut open the seal or tearing off the top or bottom sticker by hand when opening them, which is time-consuming and laborious. Inevitably, plastic fragments are easily generated when tearing the woven fabric, which may fall into the food and cause food safety problems. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a plastic valve bag for food packaging, which overcomes the defects of the prior art, adds a discharge opening, is easy to open, does not produce plastic debris, and ensures the safety of the food inside the bag.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0007] A plastic valve bag for food packaging includes a bag body with a top opening and a bottom opening. The top opening has a rectangular sealing sticker with six layers, from the inside out: a first sealing layer, a second sealing layer, a third sealing layer, a fourth sealing layer, a fifth sealing layer, and a sixth sealing layer. The bottom opening has a valve structure on one side. The bottom opening has a rectangular sealing sticker with three layers, from the inside out: a first sealing layer, a second sealing layer, and a third sealing layer.

[0008] Preferably, the first top layer is a PP film layer, the second top layer is a composite paper layer, the third top layer is a PP film layer, the fourth top layer is a woven fabric layer, the fifth top layer is a PP film layer, and the sixth top layer is a BOPP (biaxially oriented polypropylene film) colored film layer.

[0009] Furthermore, the thickness of the first top layer is 15-18 g / m². 2 The thickness of the second top layer is 80±2.4g / m. 2The thickness of the third top layer is 15-18 g / m². 2 The thickness of the fourth top layer is 75±2.25g / m. 2 The thickness of the fifth top layer is 15-18 g / m². 2 The thickness of the sixth top layer is 13.65 g / m. 2 (In actual production applications, paper, PP film, and woven fabric are measured in grams per square meter, while BOPP colored film is measured in "silks". Here, 1.5 silks, or 0.015mm, is converted to grams per square meter.)

[0010] Furthermore, the composite paper layer is a white composite paper layer.

[0011] As another design, the top sticker has four layers, namely the first top sticker layer, the second top sticker layer, the third top sticker layer and the fourth top sticker layer from the inside out.

[0012] Furthermore, the first top layer is a PP film layer, the second top layer is a composite paper layer, the third top layer is a woven fabric layer, and the fourth top layer is a BOPP colored film layer.

[0013] Preferably, the valve port structure has a cylindrical shape. After being flattened, it is inserted into the bottom opening of the bag.

[0014] Preferably, the first bottom layer is a woven fabric layer, the second top and bottom layers are PP film layers, and the third bottom layer is a BOPP (biaxially oriented polypropylene film) color film layer.

[0015] Furthermore, the thickness of the first base layer is 75±2.25 g / m. 2 The thickness of the second base layer is 15-18 g / cm. 2 The thickness of the third base layer is 13.65 g / m. 2 (As mentioned above)

[0016] Preferably, the top opening and bottom opening of the bag are the same, the width of the top sticker and the bottom sticker are the same, the width of the top sticker is adapted to the top opening of the bag, and the width of the bottom sticker is adapted to the bottom opening of the bag.

[0017] Preferably, the length of the top patch is adapted to the top opening of the bag, and the length of the bottom patch is greater than the length of the top patch, and is adapted to the bottom opening of the bag containing the valve structure (completely covering the valve structure and the corresponding bottom opening of the bag).

[0018] Preferably, the thickness of the top adhesive is 0.28±0.02mm; the thickness of the bottom adhesive is 0.15±0.02mm.

[0019] Due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0020] This invention features two openings: a top opening and a bottom opening. The bottom opening is for filling, and the valve is sealed by heat sealing after filling. The additional top opening is for unloading (and is marked on the bag to indicate to the user that the top opening is used for unloading). The top opening is opened using a top patch. Because a composite paper layer is added to the top patch, tearing the opening selectively separates the composite paper layer, thus ensuring the structural integrity of the woven fabric layers when opening (no tearing, i.e., no debris). At the same time, because a paper material layer is used in the top patch, the barrier performance and mechanical strength of the top patch are improved. Compared with the existing paper valve bags, the plastic valve bag of this application has the same barrier performance and mechanical strength, but at a lower cost. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the planar structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the top-attached tear-off bag of this utility model;

[0023] Figure 3 This is a schematic diagram of the top sticker of this utility model;

[0024] In the diagram, 1. Bag body; 2. Top patch; 21. First top patch layer; 22. Second top patch layer; 23. Third top patch layer; 24. Fourth top patch layer; 25. Fifth top patch layer; 26. Sixth top patch layer; 3. Valve structure; 4. Bottom patch. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Example 1:

[0027] like Figures 1 to 3 As shown, a plastic valve bag for food packaging includes a bag body 1. The top and bottom of the bag body 1 are respectively provided with a top opening (not shown) and a bottom opening (not shown). A rectangular sealing sticker 2 is provided above the top opening. The sealing sticker 2 has six layers, which are, from the inside out, a first sealing layer 21, a second sealing layer 22, a third sealing layer 23, a fourth sealing layer 24, a fifth sealing layer 25, and a sixth sealing layer 26; wherein the first sealing layer 21 is a PP film layer. The second top layer 22 is a composite paper layer, the third top layer 23 is a PP film layer, the fourth top layer 24 is a woven fabric layer, the fifth top layer 25 is a PP film layer, and the sixth top layer 26 is a BOPP colored film layer; a valve structure 3 is provided on one side of the bottom opening of the bag; a rectangular bottom sticker 4 for sealing is provided on the outside of the bottom opening of the bag, and the bottom sticker 4 has three layers, from the inside to the outside, namely the first bottom sticker layer (not marked), the second bottom sticker layer (not marked), and the third bottom sticker layer (not marked).

[0028] In practical applications, top sticker 2 is affixed to the opening at the top of the bag to seal it. The valve structure 3 is positioned on one side of the bottom opening of the bag, and bottom sticker 4 is affixed. When filling, the valve bag is inverted, and material is added from the bottom opening of the bag body 1. After filling, the valve is sealed using a heat-sealing process. Then, the bag body 1 is coded (with markings indicating the opening point, letting users know to open from top sticker 2). This makes it easy for users to find the correct opening when opening the bag. Because top sticker 2 has several layers, especially a composite paper layer and two PP film layers between the woven fabric layer and the bag body 1, the second top sticker layer 22 (composite paper layer) selectively separates during opening (see...). Figure 2 The fourth top layer 24 (woven fabric layer) remains intact and will not be torn, thus preventing plastic fragments from falling into the bag and ensuring the food safety of the contents.

[0029] It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A plastic valve bag for food packaging, characterized in that: The bag includes a bag body, with a top opening and a bottom opening at the top and bottom, respectively. The top opening has a rectangular sealing sticker with six layers, from the inside out: a first sealing layer, a second sealing layer, a third sealing layer, a fourth sealing layer, a fifth sealing layer, and a sixth sealing layer. The bottom opening has a valve structure on one side. The bottom opening has a rectangular sealing sticker with three layers, from the inside out: a first sealing layer, a second sealing layer, and a third sealing layer.

2. The plastic valve bag for food packaging as described in claim 1, characterized in that: The thickness of the first top layer is 15-18 g / m 2 The thickness of the second top layer is 80±2.4g / m. 2 The thickness of the third top layer is 15-18 g / m². 2 The thickness of the fourth top layer is 75±2.25g / m. 2 The thickness of the fifth top layer is 15-18 g / m². 2 The thickness of the sixth top layer is 13.65 g / m. 2 .

3. The plastic valve bag for food packaging as described in claim 1, characterized in that: The top cover has four layers, which are the first top cover layer, the second top cover layer, the third top cover layer and the fourth top cover layer from the inside out.

4. The plastic valve bag for food packaging as described in claim 1, characterized in that: The valve port structure has a cylindrical three-dimensional shape.

5. The plastic valve bag for food packaging as described in claim 1, characterized in that: The thickness of the first base layer is 75±2.25g / m. 2 The thickness of the second base layer is 15-18 g / m². 2 The thickness of the third base layer is 13.65 g / m. 2 .

6. The plastic valve bag for food packaging as described in claim 1, characterized in that: The top opening and bottom opening of the bag are the same, the top sticker and bottom sticker are the same width, the width of the top sticker is adapted to the top opening of the bag, and the width of the bottom sticker is adapted to the bottom opening of the bag.

7. The plastic valve bag for food packaging as described in claim 1, characterized in that: The length of the top patch is adapted to the top opening of the bag, and the length of the bottom patch is adapted to the bottom opening of the bag containing the valve structure.

8. The plastic valve bag for food packaging as described in claim 1, characterized in that: The thickness of the top adhesive is 0.28±0.02mm; the thickness of the bottom adhesive is 0.15±0.02mm.

Images