Packaging bag for grain preservation

Abstract

The utility model particularly relates to a packing bag for grain preservation, which comprises a bag body with a seal at the top, the bag body is made of a first barrier coating, a paper base layer and a second barrier coating which are sequentially connected from inside to outside, the bag body comprises a bag body front piece and a bag body rear piece, the top of the bag body front piece and the top of the bag body rear piece are both provided with top tearing lines, and the top tearing lines are arranged on the top of the bag body front piece and the top of the bag body rear piece. The two top tearing lines are connected with each other and located below the sealing opening, middle tearing lines are arranged in the middle of the bag body front piece and the middle of the bag body rear piece, a bonding layer is further arranged on the bag body front piece or the bag body rear piece, the bonding layer is located below the middle tearing lines, grains are loaded into the bag body through the sealing opening, and the sealing opening is subjected to heat sealing treatment. When the packaging bag needs to be opened, the packaging bag is torn along the top tearing line to form an opening, and grains are taken out from the opening. The paper base layer has the characteristics of high mechanical strength, compact structure, flexibility and high heat resistance. The barrier coating is sprayed on the paper base layer, so that the paper base has waterproof, moistureproof, antioxidant, mildew-proof and antibacterial properties.

Description

Technical Field

[0001] The utility model relates to the technical field of packaging bags, in particular to a packaging bag used for preserving grains. Background Art

[0002] In recent years, the world's grain output has increased year by year. In 2023, grain output exceeded 2.8 billion tons, of which my country's grain output was close to 700 million tons. The Food and Agriculture Organization of the United Nations issued a statement pointing out that hundreds of millions of tons of food are wasted every year in the world. Packaging is a crucial link after food production. Without packaging, it cannot be transported, stored, circulated, etc. The food waste caused by poor packaging is astonishing. Packaging is a means to prevent food from leaking, keep food fresh, and highlight brand logos. Due to various reasons, it directly or indirectly causes waste of quantity and quality loss. A large amount of food is still in the state of "first-class products, second-class packaging, third-class prices" or unpackaged. Packaging plays a vital role in maintaining food security and promoting high-quality agricultural development.

[0003] my country is a major grain producer, and it is bound to put forward high requirements for grain packaging. The annual loss of grain in the world due to improper packaging is as high as about tens of millions of tons, and the post-harvest loss of grain in my country accounts for more than 10% of the total grain. Strengthening the innovation and improvement of grain packaging is very important to reduce grain losses. In the past, my country's grain packaging mainly used traditional loess-colored and gray-brown sacks, which were mainly made of jute. The sacks have good air permeability, toughness, wear resistance, low cost, and can be used repeatedly. However, sack packaging is easily polluted by the outside world and cannot achieve the basic functions of rodent prevention, moisture prevention, insect prevention, freshness preservation, and oxidation prevention. Today's grain packaging mainly uses woven bags and composite plastic bags. Plastic woven bags are strong, wear-resistant, and not easy to deform, but they cannot meet the requirements of insect prevention, moisture prevention, mildew prevention, and oxidation prevention, and are not easy to recycle. Composite plastic bags use high barrier packaging materials. Although they can solve the problems of freshness preservation, insect prevention, and moisture prevention of grain packaging, they still have limitations due to the pollution of the environment by plastic products. Therefore, how to prepare an environmentally friendly paper-based food fresh-keeping packaging bag has important practical significance and will help ensure food security and rural revitalization. Utility Model Content

[0004] In view of the technical problems existing in the prior art, the purpose of the utility model is to provide a packaging bag for food preservation, including a bag body with a seal on the top, the bag body is made of a first barrier coating, a paper base and a second barrier coating connected in sequence from the inside to the outside, the bag body includes a bag body front piece and a bag body back piece, the paper base is a compound of Chinese pine fiber and bamboo fiber, and is prepared by wet ultra-low concentration inclined mesh molding and hot rolling treatment. The obtained paper base has the characteristics of high mechanical strength, dense structure, flexibility and strong heat resistance. In addition, the first barrier coating and the second barrier coating are sprayed on the paper base to make the paper base waterproof, moisture-proof, anti-oxidation, mildew-proof and antibacterial.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A packaging bag for preserving grains comprises a bag body with a seal on the top, the bag body is made of a first barrier coating, a paper base layer and a second barrier coating connected in sequence from the inside to the outside, the bag body comprises a front piece and a back piece, the front piece and the back piece together enclose a space for accommodating grains, a top tear line is provided at the top of the front piece and the top of the back piece, the two top tear lines are connected to each other and are both located below the seal, a middle tear line is provided at the middle of the front piece and the middle of the back piece, an adhesive layer is further provided on the front piece or the back piece, the adhesive layer is located below the middle tear line, grains are loaded into the bag body through the seal, the seal is heat-sealed, and when the packaging bag needs to be opened, it is torn along the top tear line to form an opening, and the grains are taken out from the opening.

[0007] Furthermore, the distance between the middle tear line of the front sheet of the bag body and the bottom of the bag body is smaller than the distance between the middle tear line of the back sheet of the bag body and the bottom of the bag body.

[0008] Furthermore, the distance between the middle tear line of the front piece of the bag body and the bottom of the bag body is 30-40 cm, and the distance between the middle tear line of the back piece of the bag body and the bottom of the bag body is 35-45 cm.

[0009] Furthermore, the distance between the top tear line of the front sheet of the bag body and the bottom of the bag body is equal to the distance between the top tear line of the back sheet of the bag body and the bottom of the bag body.

[0010] Furthermore, the distance between the top tear line of the front piece of the bag body and the bottom of the bag body is 60-80 cm, and the distance between the top tear line of the back piece of the bag body and the bottom of the bag body is 60-80 cm.

[0011] Furthermore, the first barrier coating is made of acrylic resin, lignin and cationic guar gum, the paper base layer is made of pine fiber and bamboo fiber, and the second barrier coating is made of acrylic resin, lignin and cationic guar gum.

[0012] Furthermore, the thickness of the first barrier coating and the second barrier coating are both 4-6 um.

[0013] Furthermore, the thickness of the paper base layer is 18-25 um.

[0014] Furthermore, the adhesive layer includes an adhesive tape and a release tape adhered to the adhesive tape, and the adhesive tape is fixed on the front sheet or the back sheet of the bag body.

[0015] The utility model has the following advantages:

[0016] 1. The paper base of the utility model adopts Chinese pine and bamboo as raw materials, which has the advantages of wide raw material sources, green environmental protection, and renewable. By compounding the two types of fibers, the characteristics of different fibers are fully utilized, the interfacial bonding force between fibers is improved, and different types of fibers can be tightly filled and connected, thereby improving the mechanical strength and barrier properties of the paper base. After hot rolling treatment, the strength and tightness of the base paper are further improved. The first barrier coating and the second barrier coating sprayed on the paper base are made of acrylic resin, lignin and cationic guar gum composite liquid, which can give the composite paper waterproof, moisture-proof, antioxidant, mildew-proof, antibacterial and other properties, and realize the high barrier application of paper-based packaging in the field of food preservation.

[0017] 2. The utility model provides an adhesive layer in the middle of the outer surface of the front piece or the back piece of the bag body. When the excess part of the upper part of the bag body is torn off through the middle tear line, the inner surface of the back piece of the bag body can be adhered and fixed to the front piece of the bag body through the adhesive tape, thereby further ensuring the sealing performance of the packaging bag, greatly reducing the volume of the packaging bag, and at the same time, the air in the bag can be discharged as much as possible, preventing the oxidation of the grain due to contact with too much air, thereby extending the shelf life of the grain. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The utility model is a front view of a packaging bag for preserving grains.

[0019] Figure 2 It is a rear view of a packaging bag for preserving grains according to the utility model.

[0020] Figure 3 It is a schematic structural diagram of the first barrier coating, the paper base layer and the second barrier coating of the utility model.

[0021] Among them, 1 is the bag body, 101 is the front piece of the bag body, 102 is the back piece of the bag body, 103 is the opening, 2a is the top tear line of the front piece of the bag body, 2b is the top tear line of the back piece of the bag body, 3 is the adhesive layer, 4a is the middle tear line of the front piece of the bag body, 4b is the middle tear line of the back piece of the bag body, 6 is the paper base layer, 7 is the first barrier coating, and 8 is the second barrier coating. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] like Figure 1-3 As shown, a packaging bag for preserving grains comprises a bag body 1 with a sealed top, the bag body 1 is made of a first barrier coating 7, a paper base layer 6 and a second barrier coating 8 connected in sequence from the inside to the outside, the bag body 1 comprises a bag body front piece 101 and a bag body back piece 102, the bag body front piece 101 and the bag body back piece 102 together enclose a space for accommodating grains, the top of the bag body front piece 101 and the top of the bag body back piece 102 are both provided with top tear lines 2a and 2b, and the two top tear lines 2a and 2b are mutually The middle of the front sheet 101 and the middle of the back sheet 102 are both connected and located below the seal. Middle tear lines 4a and 4b are provided in the middle of the bag body front sheet 101 and the bag body back sheet 102. An adhesive layer 3 is also provided on the bag body front sheet 101 or the bag body back sheet 102. The adhesive layer 3 is located below the middle tear lines 4a and 4b. The food is loaded into the bag body 1 through the seal. The seal is heat-sealed. When the packaging bag needs to be opened, it is torn along the top tear lines 2a and 2b to form an opening 103, and the food is taken out from the opening 103. The distance between the top tear line 2a of the bag body front sheet 101 and the bottom of the bag body is equal to the distance between the top tear line 2b of the bag body back sheet 102 and the bottom of the bag body, so that the torn opening 103 is flat, which is convenient for taking food. The distance between the top tear line 2a of the front sheet 101 of the bag body and the bottom of the bag body is 60-80cm, and the distance between the top tear line 2b of the back sheet 102 of the bag body and the bottom of the bag body 1 is 60-80cm. The heat sealing treatment of the sealing is performed by using a hot air blower to form a closed space inside the bag body 1. The top tear lines 2a, 2b and the middle tear lines 4a, 4b are all dotted lines, which are easy for users to tear along the dotted lines. In addition, a sealing layer can be set on the inner surface of the bag body 1 corresponding to the dotted lines to prevent external pollutants of the bag body 1 from entering the internal space of the bag body 1 through the gaps of the dotted lines, thereby avoiding food contamination.

[0024] like Figure 1 and Figure 2As shown, a middle tear line 4a, 4b is provided in the middle of the front sheet 101 and the middle of the back sheet 102, and both middle tear lines are located above the adhesive layer 3. The distance between the middle tear line 4a of the front sheet 101 and the bottom of the bag body is smaller than the distance between the middle tear line 4b of the back sheet 102 and the bottom of the bag body. The distance between the middle tear line 4a of the front sheet 101 and the bottom of the bag body 1 is 30-40 cm, and the distance between the middle tear line 4b of the back sheet 102 and the bottom of the bag body 1 is 35-45 cm. In this embodiment, the distance between the middle tear line 4a of the front piece 101 of the bag body and the bottom of the bag body 1 is L1, and L1 is 35 cm. The distance between the middle tear line 4b of the back piece 102 of the bag body and the bottom of the bag body 1 is L2, and L2 is 40 cm. When the food in the bag body 1 is not completely eaten at one time, the excess part of the upper part of the bag body 1 can be torn open through the middle tear line 4a of the front piece 101 of the bag body and the middle tear line 4b of the back piece 102 of the bag body to reduce the overall volume of the bag body 1. The excess part is the bag body 1 above the middle tear line.

[0025] like Figure 1 and Figure 2 As shown, the adhesive layer 3 includes an adhesive tape and an anti-adhesive tape adhered to the adhesive tape, and the adhesive tape is fixed to the bag body front sheet 101 or the bag body back sheet 102. In this embodiment, the adhesive tape is fixed to the bag body front sheet 101, and after the excess part of the bag body 1 is torn through the middle tear line, the anti-adhesive tape can be torn off, and then the part of the bag body back sheet 102 that is higher than the bag body front sheet 101 is folded to the adhesive tape of the bag body front sheet 101, and is tightly adhered to the adhesive tape to achieve sealing.

[0026] like Figure 3 As shown, the first barrier coating 7 is made of acrylic resin, lignin and cationic guar gum, the paper base layer 6 is made of pine fiber and bamboo fiber, and the second barrier coating 8 is made of acrylic resin, lignin and cationic guar gum. Among them, the first barrier coating 7 is located on the inner surface of the bag body 1, and the second barrier coating 8 is located on the outer surface of the bag body 1. The first barrier coating 7 and the second barrier coating 8 have the same component types, but the added proportions can be the same or different. The paper base layer 6 is obtained by uniformly mixing pine fiber and bamboo fiber in a certain proportion, and then wet-forming through an ultra-low-consistency inclined wire paper machine, and then hot-rolling treatment at high temperature. In this embodiment, the first barrier coating 7 and the second barrier coating 8 are prepared by spraying a composite liquid of acrylic resin, lignin and cationic guar gum onto the paper base layer 6. The acrylic resin has a moisture-proof effect, the lignin has water-resistant, UV-resistant and antioxidant effects, and the cationic guar gum is a water-soluble galactomannan with abundant side chain hydroxyl groups and quaternary ammonium salt groups, and has good antibacterial and mildew-proof effects. The combination of the three substances can synergistically enhance the moisture-proof, antibacterial, antioxidant and mechanical properties of the composite coating.

[0027] like Figure 3As shown, the thickness of the first barrier coating 7 and the second barrier coating 8 are both 4-6 um, and the thickness of the paper base layer 6 is 18-25 um.

[0028] The working method of the utility model is as follows:

[0029] The food is loaded into the bag body 1 through the seal, and the seal is heat-sealed. When the packaging bag needs to be opened, the top tear lines 2a and 2b are torn to form an opening 103, and the food can be taken out from the bag body 1 through the top opening 103. When the food in the bag body 1 is not completely eaten at one time, the excess part of the upper part of the bag body 1 can be torn through the middle tear lines 4a and 4b, and the part of the bag body 1 below the middle tear line is retained to reduce the overall volume of the bag body 1. After the excess part of the bag body 1 is torn through the middle tear lines 4a and 4b, the anti-adhesive tape can be torn off, and then the part of the back sheet of the bag body 1 that is higher than the front sheet 101 of the bag body is folded to the adhesive tape of the front sheet 101 of the bag body, and adhered to the adhesive tape to achieve sealing.

[0030] In general, the paper base of the utility model uses Chinese pine and bamboo as raw materials, which has the advantages of wide raw material sources, green environmental protection, and renewable. By compounding the two types of fibers, the characteristics of different fibers are fully utilized, the interfacial bonding force between the fibers is improved, and different types of fibers can be tightly filled and connected, thereby improving the mechanical strength and barrier properties of the paper base, and then after hot rolling treatment, the strength and tightness of the base paper are further improved. The first barrier coating and the second barrier coating sprayed on the paper base are sprayed with acrylic resin, lignin and cationic guar gum composite liquid, which can give the composite paper waterproof, moisture-proof, antioxidant, mildew-proof, antibacterial and other properties, and realize the high barrier application of paper-based packaging in the field of food preservation. The utility model provides an adhesive layer in the middle of the outer surface of the front piece or the back piece of the bag body. When the redundant part of the upper part of the bag body is torn off through the middle tear line, the inner surface of the back piece of the bag body can be adhered and fixed to the front piece of the bag body through the adhesive tape, thereby further ensuring the sealing performance of the packaging bag, greatly reducing the volume of the packaging bag, and at the same time, the air in the bag can be discharged as much as possible, thereby preventing the oxidation of the grain due to contact with too much air and extending the shelf life of the grain.

[0031] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principle of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A packaging bag for preserving grains, characterized in that: The bag body comprises a bag body with a seal on the top, the bag body is made of a first barrier coating, a paper base layer and a second barrier coating connected in sequence from the inside to the outside, the bag body comprises a bag body front sheet and a bag body back sheet, the bag body front sheet and the bag body back sheet together enclose a space for accommodating grains, the top of the bag body front sheet and the top of the bag body back sheet are both provided with a top tear line, the two top tear lines are connected to each other and are both located below the seal, a middle tear line is provided in the middle of the bag body front sheet and the middle of the bag body back sheet, an adhesive layer is further provided on the bag body front sheet, the adhesive layer is located below the middle tear line, the grains are loaded into the bag body through the seal, the seal is heat-sealed, when the packaging bag needs to be opened, it is torn along the top tear line to form an opening, and the grains are taken out from the opening; The distance between the middle tear line of the front sheet of the bag body and the bottom of the bag body is smaller than the distance between the middle tear line of the back sheet of the bag body and the bottom of the bag body. When the food in the bag body is not completely eaten at one time, the excess part of the upper part of the bag body is torn open through the middle tear line, and the part of the back sheet of the bag body that is higher than the front sheet of the bag body is folded to the front sheet of the bag body and bonded together through the adhesive layer; Among them, a sealing layer for preventing external contaminants from entering the internal space of the bag body is provided on the inner surface of the bag body corresponding to the top tear line of the front piece of the bag body, the top tear line of the back piece of the bag body, the middle tear line of the front piece of the bag body and the middle tear line of the back piece of the bag body.

2. A packaging bag for preserving grain according to claim 1, characterized in that: The distance between the tear line in the middle of the front piece of the bag body and the bottom of the bag body is 30-40 cm, and the distance between the tear line in the middle of the back piece of the bag body and the bottom of the bag body is 35-45 cm.

3. A packaging bag for preserving grain according to claim 1, characterized in that: The distance between the top tear line of the front piece of the bag body and the bottom of the bag body is equal to the distance between the top tear line of the back piece of the bag body and the bottom of the bag body.

4. A packaging bag for preserving grain according to claim 3, characterized in that: The distance between the top tear line of the front piece of the bag body and the bottom of the bag body is 60-80 cm, and the distance between the top tear line of the back piece of the bag body and the bottom of the bag body is 60-80 cm.

5. A packaging bag for preserving grain according to claim 1, characterized in that: The thickness of the first barrier coating and the second barrier coating are both 4-6 um.

6. A packaging bag for preserving grain according to claim 1, characterized in that: The thickness of the paper base layer is 18-25um.

7. A packaging bag for preserving grain according to claim 1, characterized in that: The adhesive layer comprises an adhesive tape and an anti-adhesive tape adhered to the adhesive tape, and the adhesive tape is fixed on the front sheet of the bag body or the back sheet of the bag body.

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