A plastic particle moisture-proof sealed storage bag

Abstract

The utility model provides a kind of plastic particle moisture-proof sealed storage bag, belong to plastic particle storage technical field.The storage bag includes bag body main part;Bag body main part has bag mouth, and bag mouth is provided with sealing assembly;Sealing assembly includes the double-track zipper being set along bag mouth edge and the sealing strip being set in double-track zipper one side;The length direction of sealing strip is same with the length direction of double-track zipper.Along the direction from the outer wall to the inner wall of bag body main part, bag body main part includes wear layer, moisture barrier layer and anti-blocking layer.The moisture-proof capacity of the storage bag is outstanding, can reduce that plastic particle is susceptible to environmental humidity in storage process, improves the storage quality of plastic particle.

Description

Technical Field

[0001] This utility model relates to the field of plastic pellet storage technology, and in particular to a moisture-proof and airtight storage bag for plastic pellets. Background Technology

[0002] Plastic granules, as a core raw material in the plastics processing industry, are widely used in electronics, automobile manufacturing, daily necessities production, and packaging materials. Their storage quality directly affects the performance and quality of subsequent processed products. Plastic granules are susceptible to environmental humidity during storage. If they absorb moisture from the air, it can lead to problems such as melt fracture, surface bubbles, and decreased mechanical properties in subsequent injection molding and extrusion processes. This not only increases the scrap rate but may also create potential quality risks in the final product. Therefore, moisture-proof and airtight storage of plastic granules is one of the key requirements in the plastics processing industry.

[0003] Currently, the industry mainly categorizes storage methods for plastic granules into three types: The first is ordinary polyethylene plastic bags. These bags are low-cost but have poor sealing. The bag openings are often sealed with simple tying or adhesive, which cannot effectively prevent the intrusion of external water vapor. Furthermore, the sealing performance deteriorates further after repeated opening and closing. Additionally, the plastic granules themselves have a certain degree of hardness and sharp edges, making them prone to puncturing the bags during long-term storage or handling, leading to moisture-proof failure and material leakage. The second type is woven bags. While they possess good impact resistance and abrasion resistance, the woven structure has natural gaps, resulting in high air permeability and extremely poor moisture-proof performance. In some scenarios, an inner film bag needs to be placed inside the woven bag to improve the sealing performance, but this increases the packaging cost and the complexity of unpacking operations. Moreover, the inner film bag is also easily damaged by friction of plastic particles or external pressure. Thirdly, traditional sealed plastic boxes or metal containers can achieve good moisture protection, but the containers have a fixed volume and large weight, which is not conducive to the flexible storage and handling of small batches of plastic particles. In addition, the box lid must be completely opened each time materials are retrieved, which exposes the remaining plastic particles in the box to the air, increasing the risk of moisture. At the same time, the container manufacturing cost is high, making it difficult to meet the needs of large-scale, low-cost raw material storage.

[0004] Therefore, it is necessary to improve the existing storage methods for plastic pellets in order to overcome the shortcomings of the existing technology. Utility Model Content

[0005] To overcome the problems existing in related technologies, the purpose of this utility model is to provide a moisture-proof and sealed storage bag for plastic granules. This storage bag has outstanding moisture-proof capabilities, which can reduce the susceptibility of plastic granules to the influence of environmental humidity during storage and improve the storage quality of plastic granules.

[0006] A moisture-proof and airtight storage bag for plastic granules, comprising a bag body; The main body of the bag has a bag opening, and a sealing assembly is provided at the bag opening; the sealing assembly includes a double-track zipper provided along the edge of the bag opening and a sealing strip provided on one side of the double-track zipper; the length direction of the sealing strip is the same as the length direction of the double-track zipper; Along the direction from the outer wall to the inner wall of the bag body, the bag body includes an anti-wear layer, a moisture barrier layer, and an anti-adhesion layer.

[0007] In a preferred embodiment of this invention, a one-way exhaust valve is further provided on the main body of the bag, and the airflow direction of the one-way exhaust valve is along the inner wall to the outer wall of the main body of the bag.

[0008] In a preferred embodiment of this utility model, an adhesive reinforcement is further provided at the bag opening. The adhesive reinforcement includes slots and points on both sides of the main body of the bag. Multiple slots and points are provided on the main body of the bag, and the points are interference-fitted with the slots. Along the length of the sealing strip, several adhesive reinforcements are provided on the main body of the bag.

[0009] In a preferred embodiment of this utility model, a desiccant container is fixedly provided at the inner corner of the main body of the bag. The desiccant container is made of breathable non-woven fabric and is fixed to the main body of the bag by heat sealing or buckle. The desiccant container bag contains montmorillonite desiccant or color-changing silica gel desiccant.

[0010] In a preferred embodiment of this invention, a humidity sensing strip is provided on the outer side of the main body of the bag. The humidity sensing strip is made of test paper containing cobalt chloride or a polymer humidity-sensitive film.

[0011] In a preferred embodiment of this invention, a handle is provided at the top of the main body of the bag, and a reinforcing piece is provided at the handle.

[0012] In a preferred embodiment of this invention, the wear-resistant layer is made of high-density polyethylene or polyamide; The moisture barrier layer is made of ethylene-vinyl alcohol copolymer or polyvinylidene chloride; The anti-adhesion layer is made of linear low-density polyethylene or cast polypropylene.

[0013] The beneficial effects of this utility model are as follows: This utility model provides a moisture-proof and sealed storage bag for plastic granules, belonging to the field of plastic granule storage technology. The storage bag includes a main body with an opening and a sealing component. The sealing component includes a double-track zipper along the edge of the opening and a sealing strip on one side of the zipper. The length of the sealing strip is the same as the length of the zipper. Along the outer wall to the inner wall of the main body, the bag includes an anti-wear layer, a moisture-proof layer, and an anti-adhesion layer. In use, the storage bag forms a dual structure of "physical barrier + elastic seal" through the double-track zipper and the butyl rubber sealing strip, reducing the amount of water vapor intrusion. Combined with the moisture-proof layer, the humidity inside the bag can be maintained at a low level for a long time, avoiding subsequent processing defects (such as injection molding bubbles and melt fracture) caused by moisture absorption by the plastic granules, and reducing the scrap rate. The anti-wear layer improves the surface abrasion resistance, effectively reducing the bag breakage rate compared to ordinary PE bags, and preventing leakage and moisture absorption of plastic granules due to bag breakage. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the moisture-proof and airtight storage bag for plastic granules provided in an embodiment of this utility model; Figure 2 This is a schematic diagram of a double-track zipper being installed at the bag opening, provided in an embodiment of this utility model. Figure 3 This is a schematic diagram of the structure of the main body of the bag provided in an embodiment of this utility model; Figure 4 This is a schematic diagram of the adhesive reinforcement provided in the embodiments of this utility model being installed on the main body of the bag.

[0015] Figure label: 1. Bag body; 11. Bag opening; 12. Handle; 13. Reinforcing strip; 14. Abrasion-resistant layer; 15. Moisture-proof layer; 16. Anti-adhesion layer; 2. One-way exhaust valve; 3. Desiccant container bag; 4. Humidity sensing strip; 5. Sealing strip; 6. Double-track zipper; 7. Adhesive reinforcement; 71. Locking point; 72. Locking groove. Detailed Implementation

[0016] Preferred embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.

[0017] Currently, the industry mainly categorizes storage methods for plastic granules into three types: The first is ordinary polyethylene plastic bags. These bags are low-cost but have poor sealing. The bag openings are often sealed with simple tying or adhesive, which cannot effectively prevent the intrusion of external water vapor. Furthermore, the sealing performance deteriorates further after repeated opening and closing. Additionally, the plastic granules themselves have a certain degree of hardness and sharp edges, making them prone to puncturing the bags during long-term storage or handling, leading to moisture-proof failure and material leakage. The second type is woven bags. While they possess good impact resistance and abrasion resistance, the woven structure has natural gaps, resulting in high air permeability and extremely poor moisture-proof performance. In some scenarios, an inner film bag needs to be placed inside the woven bag to improve the sealing performance, but this increases the packaging cost and the complexity of unpacking operations. Moreover, the inner film bag is also easily damaged by friction of plastic particles or external pressure. Thirdly, traditional sealed plastic boxes or metal containers can achieve good moisture protection, but the containers have a fixed volume and large weight, which is not conducive to the flexible storage and handling of small batches of plastic particles. In addition, the box lid must be completely opened each time materials are retrieved, which exposes the remaining plastic particles in the box to the air, increasing the risk of moisture. At the same time, the container manufacturing cost is high, making it difficult to meet the needs of large-scale, low-cost raw material storage. Based on this, this application provides a moisture-proof and airtight storage bag for plastic granules.

[0018] Example See Figures 1-4 This embodiment provides a moisture-proof and airtight storage bag for plastic granules, comprising a bag body 1; The bag body 1 has a bag opening 11, and a sealing assembly is provided at the bag opening 11; the sealing assembly includes a double-track zipper 6 provided along the edge of the bag opening 11 and a sealing strip 5 provided on one side of the double-track zipper 6; the length direction of the sealing strip 5 is the same as the length direction of the double-track zipper 6. Along the direction from the outer wall to the inner wall of the bag body 1, the bag body 1 includes an anti-wear layer 14, a moisture barrier layer 15, and an anti-adhesion layer 16.

[0019] Specifically, in one embodiment, the wear-resistant layer 14 is made of polyamide (PA) material with a thickness of 90 μm and the surface is corona treated (surface tension ≥40 dyn / cm). It has a wear resistance of ≥600 cycles / 200g load, which improves the puncture resistance performance by 25% compared to HDPE material. The moisture barrier layer 15 is made of ethylene-vinyl alcohol copolymer (EVOH) material with a thickness of 35μm. According to GB / T1037 standard, the water vapor transmission rate is ≤0.25g / (m²・24h), and the moisture barrier performance is better than the original 30μm specification. The anti-adhesion layer 16 is made of cast polypropylene (CPP) with a thickness of 55μm and a surface friction coefficient ≤0.2. For PA and PC plastic granules with strong adhesion, the adhesion rate is reduced to below 1%. It is fixed along the inner edge of the bag opening 11, and is made of food-grade PE (substrate thickness 22μm) combined with a silicone strip (diameter 3.2mm). After engagement, the water vapor permeability at the seal is ≤0.7g / (m²・24h). The depth of the serrated texture on the zipper pull surface is increased to 0.5mm, improving the anti-slip effect by 40% when opening and closing with thick gloves. The double-track zipper 6 is fixed along the inner edge of the bag opening 11. It is made of food-grade PE (substrate thickness 22μm) and silicone strip (diameter 3.2mm) composite. After engagement, the water vapor transmission rate at the seal is ≤0.7g / (m²・24h). The depth of the serrated texture on the zipper pull surface is increased to 0.5mm, and the anti-slip effect is improved by 40% when opening and closing with thick gloves. The sealing strip 5 is located below the double-track zipper 6 (closer to the inside of the bag), with a length of 52cm. It is made of butyl rubber and has a trapezoidal cross-section (top base 1.2cm, bottom base 1.8cm, thickness 2.2mm). Compared with the original rectangular cross-section, the contact area with the bag body is increased by 30%. The heat-pressing parameters are temperature 155℃, pressure 0.25MPa, and the contact gap is ≤0.1mm.

[0020] The one-way valve consists of a PP shell (1mm thick), a nitrile rubber sealing gasket (0.8mm thick), and a one-way valve core (PE material, 1cm in diameter). The airflow direction is strictly limited to "inner wall of the bag → outer wall". The exhaust pressure threshold is 0.12MPa, and the reverse sealing pressure is ≥0.3MPa to prevent outside air from seeping in.

[0021] The aforementioned moisture-proof and airtight storage bag for plastic granules utilizes a dual structure of "physical barrier + elastic seal" formed by the double-track zipper 6 and butyl rubber sealing strip 5 to reduce water vapor intrusion. Combined with the moisture-barrier layer 15, it maintains a low humidity level inside the bag for extended periods, preventing subsequent processing defects (such as injection molding bubbles and melt fracture) caused by moisture absorption by the plastic granules, thus reducing the scrap rate. The abrasion-resistant layer 14 enhances surface abrasion resistance, effectively reducing the bag breakage rate compared to ordinary PE bags and preventing leakage and moisture absorption of plastic granules due to bag damage. Furthermore, a one-way exhaust valve 2 is provided on the bag body 1, with the airflow direction of the one-way exhaust valve 2 running from the inner wall to the outer wall of the bag body 1.

[0022] Furthermore, an adhesive reinforcement 7 is provided at the bag opening 11. The adhesive reinforcement 7 includes slots 72 and points 71 on both sides of the main body of the bag. Multiple slots 72 and points 71 are provided on the main body of the bag. The points 71 and slots 72 are interference fit. Along the length of the sealing strip 5, several adhesive reinforcement members 7 are provided on the main body 1 of the bag. On one hand, the locking points 71 and locking grooves 72 of the adhesive reinforcement members 7 directly bear part of the weight and tension of the bag body through an interference fit; the interference fit structure of the adhesive reinforcement members 7 has "impact-resistant rebound" characteristics. The rubber protrusions (0.1mm thick) on the inner walls of the locking points 71 and locking grooves 72 can buffer impact energy, preventing the locking points 71 from disengaging due to instantaneous force. Simultaneously, the distribution design of the locking points (uniformly arranged along the sealing strip 5) can disperse the impact energy to the entire area of ​​the bag opening 11. The aging and failure of the double-track zipper 6 and the sealing strip 5 largely stems from "fatigue damage" caused by long-term bearing of the tension of the bag opening 11. The adhesive reinforcement members 7 can reduce this loss, indirectly reducing the overall replacement cost of the storage bag.

[0023] Furthermore, a desiccant container 3 is fixedly provided at the inner corner of the main body 1 of the bag. The desiccant container 3 is made of breathable non-woven fabric and is fixed to the main body 1 of the bag by heat sealing or buckle. The desiccant container 3 contains montmorillonite desiccant or color-changing silica gel desiccant.

[0024] When the plastic granule storage bag is full, the corners inside the bag form "air stagnation zones" due to material accumulation. Air circulation is poor in these areas, and if there are minor leaks in the sealing components (such as zipper gaps or incomplete heat sealing), water vapor easily accumulates, becoming a "hidden risk point" for the plastic granules to absorb moisture. The desiccant container bag 3, fixed to the internal corners, can directly function at the "source of moisture accumulation": the montmorillonite desiccant (moisture absorption capacity ≥ 30% of its own weight) can quickly absorb moisture from the stagnant air. Furthermore, a humidity sensing strip 4 is provided on the outer side of the bag body 1, made of cobalt chloride-containing test paper or a polymer humidity-sensitive film.

[0025] When the relative humidity (RH) inside the bag is less than 40%, the humidity sensing strip 4 displays its initial color; when the relative humidity (RH) inside the bag is greater than 60%, the humidity sensing strip 4 displays a color-changing reminder.

[0026] Furthermore, a handle 12 is provided on the top of the bag body 1, and a reinforcing piece 13 is provided at the handle 12. The handle 12 is located at both ends of the top of the bag body 1, and is made of PA tape of the same material as the abrasion-resistant layer 14. The two ends are double-fixed by "heat sealing + sewing"; the reinforcing piece 13 is attached to the connection between the handle 12 and the bag body 1, and is a three-layer composite structure. It is integrally formed with the bag body through a hot pressing process (hot pressing temperature 190℃, pressure 0.4MPa) to prevent the handle 12 from tearing the bag body when under force.

[0027] Furthermore, the wear-resistant layer 14 is made of high-density polyethylene (HDPE) or polyamide (PA); The moisture barrier layer 15 is made of ethylene-vinyl alcohol copolymer (EVOH) or polyvinylidene chloride (PVDC); The anti-adhesion layer 16 is made of linear low-density polyethylene (LLDPE) or cast polypropylene (CPP).

[0028] The abrasion-resistant layer 14 can improve the abrasion resistance of the bag body. During warehouse pallet stacking and forklift transportation, the surface of the bag is not easily scratched or damaged by friction with metal shelves and the ground, which can extend the service life of the storage bag.

[0029] The core advantages of EVOH material are its extremely low moisture permeability and strong moisture barrier stability, which can meet the long-term storage needs of high-end plastic granules (such as PET and PA plastic granules, which are sensitive to humidity).

[0030] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings. In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0031] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0032] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. The above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. For those skilled in the art, this utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A moisture-proof and airtight storage bag for plastic granules, comprising a bag body, characterized in that: The main body of the bag has a bag opening, and a sealing assembly is provided at the bag opening; the sealing assembly includes a double-track zipper provided along the edge of the bag opening and a sealing strip provided on one side of the double-track zipper; the length direction of the sealing strip is the same as the length direction of the double-track zipper; Along the direction from the outer wall to the inner wall of the bag body, the bag body includes an anti-wear layer, a moisture barrier layer, and an anti-adhesion layer.

2. The moisture-proof and airtight storage bag for plastic granules according to claim 1, characterized in that: The bag body is also provided with a one-way exhaust valve, and the airflow direction of the one-way exhaust valve is along the inner wall to the outer wall of the bag body.

3. The moisture-proof and airtight storage bag for plastic granules according to claim 2, characterized in that: The bag opening is also provided with an adhesive reinforcement, which includes a slot and a locking point on both sides of the main body of the bag. Multiple slots and locking points are provided on the main body of the bag, and the locking points are interference fit with the slots. Along the length of the sealing strip, several adhesive reinforcements are provided on the main body of the bag.

4. The moisture-proof and airtight storage bag for plastic granules according to any one of claims 1-3, characterized in that: A desiccant container is fixedly provided at the inner corner of the main body of the bag. The desiccant container is made of breathable non-woven fabric and is fixed to the main body of the bag by heat sealing or buckle. The desiccant container bag contains montmorillonite desiccant or color-changing silica gel desiccant.

5. The moisture-proof and airtight storage bag for plastic granules according to any one of claims 1-3, characterized in that: The outer side of the main body of the bag is provided with a humidity sensing strip, which is made of test paper containing cobalt chloride or a polymer humidity-sensitive film.

6. The moisture-proof and airtight storage bag for plastic granules according to any one of claims 1-3, characterized in that: The top of the main body of the bag is provided with a handle, and a reinforcing piece is provided at the handle.

7. The moisture-proof and airtight storage bag for plastic granules according to any one of claims 1-3, characterized in that: The wear-resistant layer is made of high-density polyethylene or polyamide; The moisture barrier layer is made of ethylene-vinyl alcohol copolymer or polyvinylidene chloride; The anti-adhesion layer is made of linear low-density polyethylene or cast polypropylene.

Images