Three-layer co-extrusion moisture-absorption-resistant heavy package bag and preparation method thereof

Abstract

The invention relates to the technical field of heavy bags, and discloses a three-layer co-extrusion moisture-absorption-resistant heavy bag and a preparation method thereof.The three-layer co-extrusion moisture-absorption-resistant heavy bag comprises an outer layer, a middle layer and an inner layer; the outer layer is prepared from the following raw materials in parts by weight: 70 to 90 parts of metallocene linear low-density polyethylene A, 10 to 25 parts of a processing auxiliary functional material and 1 to 5 parts of an anti-blocking agent, and the outer layer is prepared from the following raw materials in parts by weight: 70 to 90 parts of metallocene linear low-density polyethylene A, 10 to 25 parts of a processing auxiliary functional material and 1 to 5 parts of an anti-blocking agent. The inner layer comprises the following raw materials in parts by weight: 70-90 parts of metallocene linear low-density polyethylene A, 10-25 parts of a processing auxiliary functional material and 1-5 parts of an anti-blocking agent. The packaging bag disclosed by the invention is beneficial to improving the moisture barrier effect, so that moisture absorption of the compound fertilizer is avoided, the storage time of the compound fertilizer can be effectively prolonged after packaging, meanwhile, the product disclosed by the invention can be suitable for a modern automatic production line, and high-speed and automatic filling is realized.

Description

Technical Field

[0001] The invention relates to the technical field of heavy-duty bags, in particular to a three-layer co-extruded moisture-absorption resistant heavy-duty bag and a preparation method thereof. Background Art

[0002] Packaging bags refer to bags used to pack various supplies, making it easy to transport and store goods during production and circulation;

[0003] Compound fertilizer refers to a fertilizer containing two or more nutrients of nitrogen, phosphorus and potassium. Compound fertilizer has the advantages of high nutrient content, few by-products and good physical properties. It plays a very important role in balanced fertilization, improving fertilizer utilization and promoting high and stable yields of crops. Compound fertilizer packaging bags are made of polypropylene woven bags, which are prepared through processes such as wire drawing, circular weaving, slitting and bag making. The production process is complicated, and the woven bags have poor barrier properties and cannot effectively block moisture, which easily causes compound fertilizer to absorb moisture and agglomerate, affecting product quality.

[0004] To this end, we propose a three-layer co-extruded anti-moisture absorption heavy-duty bag and a preparation method thereof, which can effectively prolong the storage time of compound fertilizer and can be applied to modern automated production lines to achieve high-speed and automated filling. Summary of the invention

[0005] The purpose of the present invention is to provide a three-layer co-extruded moisture absorption resistant heavy-duty bag and a preparation method thereof, which solves the problems raised in the background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a three-layer co-extruded moisture absorption resistant heavy-duty bag, comprising: an outer layer, a middle layer and an inner layer;

[0007] The outer layer comprises the following raw materials in proportion by weight: 70-90 parts of metallocene linear low-density polyethylene A, 10-25 parts of processing auxiliary functional materials, and 1-5 parts of opening agent;

[0008] The middle layer comprises the following raw materials in proportion by weight: 50-70 parts of medium-high density metallocene polyethylene B and 30-50 parts of high-density polyethylene C;

[0009] The inner layer comprises the following raw materials in proportion by weight: 70-90 parts of metallocene linear low-density polyethylene A, 10-25 parts of processing auxiliary functional materials, and 1-5 parts of opening agents.

[0010] As a preferred embodiment of the present invention, the thickness ratio of the outer layer, the middle layer and the inner layer is 1:1:1-1:3:1.

[0011] As a preferred embodiment of the present invention, the metallocene linear low-density polyethylene A is a copolymer of ethylene and hexene, and its melt mass flow rate at 190°C and 2.16kg is 0.5g / 10mi-1.5g / 10min, and its density is 0.910g / cm3-0.920g / cm 3 .

[0012] As a preferred embodiment of the present invention, the medium-high density metallocene polyethylene B is a copolymer of ethylene and hexene, and its melt mass flow rate at 190°C and 2.16kg is 0.5g / 10min-1.5g / 10min, and its density is 0.920g / cm3-0.935g / cm4 3 .

[0013] As a preferred embodiment of the present invention, the melt mass flow rate of high-density polyethylene C at 190°C and 2.16 kg is 0.15 g / 10 min-1.5 g / 10 min, and the density is 0.950 g / cm 3 -0.960g / cm 3 .

[0014] As a preferred embodiment of the present invention, the processing auxiliary functional material is low-density polyethylene.

[0015] As a preferred embodiment of the present invention, the opening agent is an amide lubricant.

[0016] The present invention also relates to a method for preparing a three-layer co-extruded moisture absorption resistant heavy-duty bag, the method steps are as follows:

[0017] Step 1: The raw materials of the outer layer, the middle layer and the inner layer are introduced into the film blowing equipment, and then the film blowing operation is performed, and the film blowing materials are led out under the action of traction;

[0018] Step 2: Use printing equipment to print the film-blown products;

[0019] Step 3: Folding and embossing the product obtained in step 2 by means of a folding and embossing device;

[0020] Step 4: Import the folded and embossed materials into the bag making machine for bag making.

[0021] As a preferred embodiment of the present invention, the film blowing equipment is a three-layer co-extrusion film blowing equipment, the screw diameter is 60 / 80 / 60mm, the die diameter is 160mm, and during the processing, the screw heating temperature is 160-190°C, the screw speed is 30-90rpm, the die heating temperature is 170-190°C, and the traction speed during production and preparation is 20-35m / min.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The packaging bag produced by the process of the present invention is beneficial to improving the effect of water barrier, thereby helping to prevent the compound fertilizer from absorbing moisture, thereby effectively extending the storage time of the compound fertilizer after packaging. At the same time, the product of the present invention can be applied to modern automated production lines to achieve high-speed, automated filling. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0025] The present invention provides a technical solution: a three-layer co-extruded moisture absorption resistant heavy-duty bag, comprising: an outer layer, a middle layer and an inner layer;

[0026] The outer layer comprises the following raw materials in proportion by weight: 70-90 parts of metallocene linear low-density polyethylene A, 10-25 parts of processing auxiliary functional materials, and 1-5 parts of opening agent;

[0027] The middle layer comprises the following raw materials in proportion by weight: 50-70 parts of medium-high density metallocene polyethylene B and 30-50 parts of high-density polyethylene C;

[0028] The inner layer comprises the following raw materials in proportion by weight: 70-90 parts of metallocene linear low-density polyethylene A, 10-25 parts of processing auxiliary functional materials, and 1-5 parts of opening agents.

[0029] Furthermore, the thickness ratio of the outer layer, the middle layer and the inner layer is 1:1:1-1:3:1.

[0030] Furthermore, the metallocene linear low-density polyethylene A is a copolymer of ethylene and hexene, and its melt mass flow rate at 190°C and 2.16 kg is 0.5 g / 10min-1.5 g / 10min, and its density is 0.910 g / cm3-0.920 g / cm 3 .

[0031] Furthermore, the medium-high density metallocene polyethylene B is a copolymer of ethylene and hexene, and its melt mass flow rate at 190°C and 2.16 kg is 0.5 g / 10 min-1.5 g / 10 min, and its density is 0.920 g / cm3-0.935 g / cm3. 3 .

[0032] Furthermore, the melt mass flow rate of high-density polyethylene C at 190°C and 2.16 kg is 0.15 g / 10 min-1.5 g / 10 min, and the density is 0.950 g / cm 3-0.960g / cm 3 .

[0033] Furthermore, the processing auxiliary functional material is low-density polyethylene.

[0034] Furthermore, the anti-blocking agent is an amide lubricant.

[0035] Embodiment 1

[0036] Outer materials: 70 parts of metallocene linear low-density polyethylene A, 25 parts of low-density polyethylene, 5 parts of amide lubricant;

[0037] Middle layer raw materials: 70 parts of medium-high density metallocene polyethylene B, 30 parts of high-density polyethylene C;

[0038] Inner layer materials: 70 parts of metallocene linear low-density polyethylene A, 25 parts of low-density polyethylene, 5 parts of amide lubricant

[0039] The above raw materials are introduced into the three-layer co-extrusion blown film equipment, and then the film blowing operation is carried out. The screw diameter is 60 / 80 / 60mm, and the die diameter is 160mm. During the processing, the screw heating temperature is 160-190℃, the screw speed is 30-90rpm, and the die heating temperature is 170-190℃. The traction speed during production preparation is 20-35m / min. The film blowing material is exported under the action of traction, and then the film blowing product is printed by the printing equipment, and then the product is folded and embossed by the folding and embossing equipment. Finally, the folded and embossed material is introduced into the bag making machine for bag making.

[0040] Embodiment 2

[0041] Outer materials: 80 parts of metallocene linear low-density polyethylene A, 15 parts of low-density polyethylene, 5 parts of amide lubricant;

[0042] Middle layer materials: 80 parts of medium-high density metallocene polyethylene B, 20 parts of high-density polyethylene C;

[0043] Inner layer materials: 80 parts of metallocene linear low-density polyethylene A, 15 parts of low-density polyethylene, 5 parts of amide lubricant

[0044] The above raw materials are introduced into the three-layer co-extrusion blown film equipment, and then the film blowing operation is carried out. The screw diameter is 60 / 80 / 60mm, and the die diameter is 160mm. During the processing, the screw heating temperature is 160-190℃, the screw speed is 30-90rpm, and the die heating temperature is 170-190℃. The traction speed during production preparation is 20-35m / min. The film blowing material is exported under the action of traction, and then the film blowing product is printed by the printing equipment, and then the product is folded and embossed by the folding and embossing equipment. Finally, the folded and embossed material is introduced into the bag making machine for bag making.

[0045] Embodiment 3

[0046] Outer materials: 80 parts of metallocene linear low-density polyethylene A, 15 parts of low-density polyethylene, 5 parts of amide lubricant;

[0047] Middle layer raw materials: 85 parts of medium-high density metallocene polyethylene B, 15 parts of high-density polyethylene C;

[0048] Inner layer materials: 75 parts of metallocene linear low-density polyethylene A, 20 parts of low-density polyethylene, 5 parts of amide lubricant

[0049] The above raw materials are introduced into the three-layer co-extrusion blown film equipment, and then the film blowing operation is carried out. The screw diameter is 60 / 80 / 60mm, the die diameter is 160mm, and during the processing, the screw heating temperature is 160-190℃, the screw speed is 30-90rpm, the die heating temperature is 170-190℃, and the traction speed during production preparation is 20-35m / min. The blown film material is led out under the action of traction, and then the blown film product is printed by the printing equipment, and then the product is folded and embossed by the folding and embossing equipment, and finally the folded and embossed material is introduced into the bag making machine for bag making. .

[0050] Embodiment 4

[0051] Outer materials: 85 parts of metallocene linear low-density polyethylene A, 10 parts of low-density polyethylene, 5 parts of amide lubricant;

[0052] Middle layer materials: 75 parts of medium-high density metallocene polyethylene B, 25 parts of high-density polyethylene C;

[0053] Inner layer materials: 75 parts of metallocene linear low-density polyethylene A, 22 parts of low-density polyethylene, 3 parts of amide lubricant

[0054] The above raw materials are introduced into the three-layer co-extrusion blown film equipment, and then the film blowing operation is carried out. The screw diameter is 60 / 80 / 60mm, and the die diameter is 160mm. During the processing, the screw heating temperature is 160-190℃, the screw speed is 30-90rpm, and the die heating temperature is 170-190℃. The traction speed during production preparation is 20-35m / min. The film blowing material is exported under the action of traction, and then the film blowing product is printed by the printing equipment, and then the product is folded and embossed by the folding and embossing equipment. Finally, the folded and embossed material is introduced into the bag making machine for bag making.

[0055] Embodiment 5

[0056] Outer materials: 75 parts of metallocene linear low-density polyethylene A, 22 parts of low-density polyethylene, 3 parts of amide lubricant;

[0057] Middle layer raw materials: 70 parts of medium-high density metallocene polyethylene B, 30 parts of high-density polyethylene C;

[0058] Inner layer materials: 75 parts of metallocene linear low-density polyethylene A, 20 parts of low-density polyethylene, 5 parts of amide lubricant

[0059] The above raw materials are introduced into the three-layer co-extrusion blown film equipment, and then the film blowing operation is carried out. The screw diameter is 60 / 80 / 60mm, and the die diameter is 160mm. During the processing, the screw heating temperature is 160-190℃, the screw speed is 30-90rpm, and the die heating temperature is 170-190℃. The traction speed during production preparation is 20-35m / min. The film blowing material is exported under the action of traction, and then the film blowing product is printed by the printing equipment, and then the product is folded and embossed by the folding and embossing equipment. Finally, the folded and embossed material is introduced into the bag making machine for bag making.

[0060] In summary, the packaging bag produced by the process of the present invention is beneficial to improving the moisture barrier effect, thereby preventing the compound fertilizer from absorbing moisture, thereby effectively extending the storage time of the compound fertilizer after packaging. At the same time, the product of the present invention can be applied to modern automated production lines to achieve high-speed, automated filling.

[0061] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0062] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A three-layer co-extruded anti-moisture absorption heavy-duty bag, characterized in that: include: outer, middle and inner layers; The outer layer comprises the following raw materials in proportion by weight: 70-90 parts of metallocene linear low-density polyethylene A, 10-25 parts of processing auxiliary functional materials, and 1-5 parts of opening agent; The middle layer comprises the following raw materials in proportion by weight: 50-70 parts of medium-high density metallocene polyethylene B and 30-50 parts of high-density polyethylene C; The inner layer comprises the following raw materials in proportion by weight: 70-90 parts of metallocene linear low-density polyethylene A, 10-25 parts of processing auxiliary functional materials, and 1-5 parts of opening agents.

2. A three-layer co-extruded moisture absorption resistant heavy-duty bag according to claim 1, characterized in that: The thickness ratio of the outer layer, the middle layer and the inner layer is 1:1:1-1:3:

1.

3. The three-layer co-extruded moisture absorption resistant heavy-duty bag according to claim 1, characterized in that: Metallocene linear low-density polyethylene A is a copolymer of ethylene and hexene, and its melt mass flow rate at 190°C and 2.16 kg is 0.5 g / 10 mi-1.5 g / 10 min, and its density is 0.910 g / cm3-0.920 g / cm 3 .

4. The three-layer co-extruded anti-moisture absorption heavy-duty bag according to claim 1, characterized in that: Medium-high density metallocene polyethylene B is a copolymer of ethylene and hexene, with a melt mass flow rate of 0.5 g / 10 min-1.5 g / 10 min at 190 ° C and 2.16 kg, and a density of 0.920 g / cm-0.935 g / cm 3 .

5. The three-layer co-extruded moisture absorption resistant heavy-duty bag according to claim 1, characterized in that: The melt mass flow rate of high-density polyethylene C at 190°C and 2.16 kg is 0.15 g / 10 min-1.5 g / 10 min, and the density is 0.950 g / cm 3 -0.960g / cm 3 .

6. The three-layer co-extruded moisture absorption resistant heavy-duty bag according to claim 1, characterized in that: The processing auxiliary functional material is low-density polyethylene.

7. The three-layer co-extruded anti-moisture absorption heavy-duty bag according to claim 1, characterized in that: The anti-blocking agent is an amide lubricant.

8. A method for preparing a three-layer co-extruded anti-moisture absorption heavy-duty bag, applicable to the three-layer co-extruded anti-moisture absorption heavy-duty bag according to claims 1-7, characterized in that: The steps are as follows: Step 1: The raw materials of the outer layer, the middle layer and the inner layer are introduced into the film blowing equipment, and then the film blowing operation is performed, and the film blowing materials are led out under the action of traction; Step 2: Use printing equipment to print the film-blown products; Step 3: Folding and embossing the product obtained in step 2 by means of a folding and embossing device; Step 4: Import the folded and embossed materials into the bag making machine for bag making.

9. The method for preparing a three-layer co-extruded moisture absorption resistant heavy-duty bag according to claim 8, characterized in that: The film blowing equipment is a three-layer co-extrusion film blowing equipment with a screw diameter of 60 / 80 / 60mm and a die diameter of 160mm. During the processing, the screw heating temperature is 160-190°C, the screw speed is 30-90rpm, the die heating temperature is 170-190°C, and the traction speed during production preparation is 20-35m / min.