CN114454581A - Environment-friendly mail-order express delivery film and preparation method thereof - Google Patents
Environment-friendly mail-order express delivery film and preparation method thereof Download PDFInfo
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- CN114454581A CN114454581A CN202210130019.2A CN202210130019A CN114454581A CN 114454581 A CN114454581 A CN 114454581A CN 202210130019 A CN202210130019 A CN 202210130019A CN 114454581 A CN114454581 A CN 114454581A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/05—5 or more layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/41—Opaque
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/582—Tearability
- B32B2307/5825—Tear resistant
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/71—Resistive to light or to UV
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/726—Permeability to liquids, absorption
- B32B2307/7265—Non-permeable
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention discloses an environment-friendly mail-order express delivery film and a preparation method thereof, wherein the film comprises an upper surface layer, a core layer, a lower surface layer and a lower surface layer from top to bottom, wherein the preparation raw material of the upper surface layer is extinction master batch; the preparation raw materials of the previous surface layer comprise homopolymerized polypropylene and pearl master batch; the core layer is prepared from the raw materials of homo-polypropylene, titanium dioxide master batches, pearlescent master batches and an antistatic agent; the preparation raw materials of the next surface layer comprise extinction master batch and titanium dioxide master batch; the preparation raw materials of the lower surface layer comprise heat-sealing master batch and an anti-sticking agent. The mail-order express delivery film provided by the invention is low in gram weight, high in mechanical property and good in water and oil resistance; the preparation method has simple process, does not need gluing or blackening treatment, has low cost and has higher application value.
Description
Technical Field
The invention relates to the field of composite materials, in particular to an environment-friendly mail-order express delivery film and a preparation method thereof.
Background
At present, the express delivery industry generally adopts paper file bags to package documents or small commodities in postal delivery, and the paper packaging bags are generally sealed by glue, so that the defects of environmental pollution, high cost and heavy weight exist. In addition, during transportation, the paper packaging bag is easily affected with moisture and damaged, so that internal documents or small commodities are damaged.
The polyethylene PE film is usually adopted for packaging when clothes, food and electronic products are posted, and the packaging mode has the defects that the packaging bag is easy to deform and break, and can not effectively protect commodities in the packaging bag. In addition, in terms of appearance, in order to protect privacy of customers, the packaging bag adopting the polyethylene PE film is usually selected to be black, so that the appearance is not beautiful and the quality feeling is brought to people.
The problem to be solved in the field is to meet the demand of downstream customers for the mail order express delivery films and solve the problems.
Disclosure of Invention
In view of the above, one of the purposes of the present invention is to provide an environment-friendly mail order express delivery film, which can be heat-sealed without using glue to seal, compared with paper packaging and polyethylene PE film packaging, and effectively reduce environmental pollution caused by using a large amount of glue; meanwhile, the waterproof and moistureproof paint has excellent waterproof and moistureproof performance, corrosion resistance and mechanical property, and has lower density and cost.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the invention has the beneficial effects that:
(1) in appearance, a certain amount of pearlescent master batches are added into the environment-friendly mail order express delivery film to enable the surface to be pure white, meanwhile, titanium white master batches are added into the film to enable the surface of the film to be metallic luster, the appearance is higher, the outer surface layer of the film is beneficial to printing ink printing through corona treatment, unique express delivery bags are provided for various express delivery industries, and the effect of expanding propaganda is achieved;
(2) in terms of physical properties, the film has the characteristics of a polypropylene film while having stronger mechanical properties after being subjected to a biaxial stretching process, has better water resistance, moisture resistance, tear resistance, ultraviolet resistance and corrosion resistance compared with paper express packaging, and also has the characteristics of opacity, so that the confidentiality of commodities and documents in the bag can be ensured;
(3) in the aspect of subsequent processing, a proper amount of heat-seal master batches are added into the inner surface layer and the lower surface layer of the film, so that the film has heat-seal performance, and downstream customers can have higher heat-seal strength without adopting glue for sealing;
(4) from the viewpoint of use, the low density polyethylene film usually has a density of 0.92g/cm3The density of the white cardboard is 1.3g/cm3The density of the product of the invention is 0.6-0.8 g/cm3The system can save the use amount for customers, reduce the transportation load and save energy.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The manufacturers of some of the raw materials involved in the examples of the present invention are shown in table 1 below:
TABLE 1
| Raw materials | Manufacturer of the product | Number plate |
| Pearl master batch | Buddha mountain plastic-made moon | YYJT008S |
| Homo-polypropylene | China petroleum | L5D98V |
| Titanium white masterbatch | Gaboer | W8865 |
| Antistatic agent | Hangzhou Beisheng | KJ210 |
| Pearl master batch | Buddha mountain plastic-made moon | ZG905B |
| Matting masterbatch | Guangdong general sailer | MC703 |
| Heat-sealing master batch | Chongqing Tiancheng plastic | TF1007 |
| Anti-sticking agent | Shantou bass technology | ABPP905A |
Example 1
An environment-friendly mail-order express delivery film comprises an upper surface layer, a core layer, a lower surface layer and a lower surface layer from top to bottom, wherein the upper surface layer is prepared from delustering master batches, the upper surface layer is prepared from homo-polypropylene and pearl master batches, the core layer is prepared from homo-polypropylene, titanium white master batches, pearl master batches and an antistatic agent, the lower surface layer is prepared from delustering master batches and titanium white master batches, and the lower surface layer is prepared from heat-sealing master batches and an anti-sticking agent; wherein, the preparation raw material of the upper surface layer is extinction master batch; the pearl master batch accounts for 5% of the total weight of the raw materials for preparing the upper surface layer; in the core layer, the weight percentages of the raw materials are as follows: 1.2 percent of titanium dioxide master batch, 12 percent of pearly-luster master batch, 0.4 percent of antistatic agent and the balance of homopolymerized polypropylene; the titanium dioxide master batch accounts for 6 percent of the total weight of the preparation raw materials of the next subsurface layer; the heat-seal master batch accounts for 98 percent of the total weight of the raw materials for preparing the lower surface layer.
The preparation method of the environment-friendly mail order express delivery film comprises the following steps:
1) weighing the following raw materials: weighing the preparation raw materials of the upper surface layer, the last surface layer, the core layer, the next surface layer and the lower surface layer according to the proportion in the embodiment, and respectively mixing uniformly for later use;
2) extruding: respectively adding the preparation raw materials of the upper surface layer, the core layer, the lower surface layer and the lower surface layer into corresponding extruders in die heads, and extruding the five corresponding raw materials from the die heads through corresponding connecting pipes to form a cast sheet with the thickness of 1-2 mm; the temperature of the single-screw extruder corresponding to the upper surface layer is set to be 210 ℃, the temperature of the extruder corresponding to the next surface layer is set to be 225 ℃, the temperature of the extruder corresponding to the last surface layer is set to be 225 ℃, the temperature of the extruder corresponding to the next surface layer is set to be 210 ℃, the temperature of the extruder corresponding to the core layer is set to be 220 ℃, and the temperature of the die head is set to be 230 ℃;
3) sequentially carrying out longitudinal stretching, transverse stretching, rolling, corona treatment, aging treatment and slitting on the cast sheet obtained in the step 2) to finally obtain a product; wherein, during longitudinal stretching, the temperature of the preheating zone is 130 ℃, the temperature of the stretching roller is 126 ℃, the stretching magnification is 4.5 times, and the temperature of the setting roller is 120 ℃; during transverse stretching, the temperature of a preheating zone is 170 ℃, the temperature of a stretching zone is 157 ℃, the temperature of a shaping zone is 170 ℃, the temperature of a cooling zone is indoor temperature, and the maximum stretching ratio of the thick sheet is 8.5 times; during corona treatment, the corona power of the upper surface is 44Wmin/m, and the corona power of the lower surface is 30 Wmin/m.
The final prepared mail-order express film had a thickness of 46.86 μm and a density of 0.66g/cm3(ii) a Wherein the upper surface layer has a thickness of 3.65 μm, the last surface layer has a thickness of 2.01 μm, and the core layer has a thicknessThe degree was 38.11 μm, the thickness of the next subsurface layer was 1.97 μm, and the thickness of the subsurface layer was 1.12 μm.
Example 2
An environment-friendly mail-order express delivery film comprises an upper surface layer, a core layer, a lower surface layer and a lower surface layer from top to bottom, wherein the upper surface layer is prepared from delustering master batches, the upper surface layer is prepared from homo-polypropylene and pearl master batches, the core layer is prepared from homo-polypropylene, titanium white master batches, pearl master batches and an antistatic agent, the lower surface layer is prepared from delustering master batches and titanium white master batches, and the lower surface layer is prepared from heat-sealing master batches and an anti-sticking agent; wherein, the pearl master batch accounts for 2 percent of the total weight of the raw materials for preparing the upper surface layer; the titanium dioxide master batch accounts for 1% of the total weight of the preparation raw materials of the next subsurface layer; in the core layer, the weight percentages of the raw materials are as follows: 2% of titanium dioxide master batch, 30% of pearlescent master batch, 0.5% of antistatic agent and the balance of homopolymerized polypropylene; the heat-seal master batch accounts for 89% of the total weight of the raw materials for preparing the lower surface layer.
The preparation method of the environment-friendly mail order express delivery film comprises the following steps:
1) weighing the following raw materials: weighing the preparation raw materials of the upper surface layer, the last surface layer, the core layer, the next surface layer and the lower surface layer according to the proportion in the embodiment, and respectively mixing uniformly for later use;
2) extruding: respectively adding the preparation raw materials of the upper surface layer, the core layer, the lower surface layer and the lower surface layer into corresponding extruders in die heads, and extruding the five corresponding raw materials from the die heads through corresponding connecting pipes to form a cast sheet with the thickness of 1-2 mm; the temperature of the single-screw extruder corresponding to the upper surface layer is set to be 190 ℃, the temperature of the extruder corresponding to the next surface layer is set to be 200 ℃, the temperature of the extruder corresponding to the last surface layer is set to be 200 ℃, the temperature of the extruder corresponding to the next surface layer is set to be 190 ℃, the temperature of the extruder corresponding to the core layer is set to be 200 ℃, and the temperature of the die head is set to be 210 ℃;
3) sequentially carrying out longitudinal stretching, transverse stretching, rolling, corona treatment, aging treatment and slitting on the cast sheet obtained in the step 2) to finally obtain a product; wherein, during longitudinal stretching, the temperature of the preheating zone is 120 ℃, the temperature of the stretching roller is 125 ℃, the stretching magnification is 4 times, and the temperature of the shaping roller is 100 ℃; during transverse stretching, the temperature of a preheating zone is 164 ℃, the temperature of a stretching zone is 152 ℃, the temperature of a shaping zone is 165 ℃, the temperature of a cooling zone is indoor temperature, and the maximum stretching magnification of the thick sheet is 8 times; during corona treatment, the corona power of the upper surface is 44Wmin/m, and the corona power of the lower surface is 30 Wmin/m.
The thickness of the finally prepared mail-order express film is 36.63 mu m, and the density is 0.67g/cm3(ii) a Wherein the upper surface layer had a thickness of 1.21 μm, the former surface layer had a thickness of 3.19 μm, the core layer had a thickness of 29.33 μm, the next surface layer had a thickness of 1.87 μm, and the lower surface layer had a thickness of 1.03 μm.
Example 3
An environment-friendly mail-order express delivery film comprises an upper surface layer, a core layer, a lower surface layer and a lower surface layer from top to bottom, wherein the upper surface layer is prepared from delustering master batches, the upper surface layer is prepared from homo-polypropylene and pearl master batches, the core layer is prepared from homo-polypropylene, titanium white master batches, pearl master batches and an antistatic agent, the lower surface layer is prepared from delustering master batches and titanium white master batches, and the lower surface layer is prepared from heat-sealing master batches and an anti-sticking agent; wherein, the pearl master batch accounts for 8 percent of the total weight of the raw materials for preparing the upper surface layer; the titanium dioxide master batch accounts for 5 percent of the total weight of the next preparation raw material of the surface layer; in the core layer, the weight percentages of the raw materials are as follows: 5% of titanium dioxide master batch, 15% of pearlescent master batch, 2% of antistatic agent and the balance of homopolymerized polypropylene; the heat-seal master batch accounts for 98 percent of the total weight of the raw materials for preparing the lower surface layer.
The preparation method of the environment-friendly mail order express delivery film comprises the following steps:
1) weighing the following raw materials: weighing the preparation raw materials of the upper surface layer, the last surface layer, the core layer, the next surface layer and the lower surface layer according to the proportion in the embodiment, and respectively mixing uniformly for later use;
2) extruding: respectively adding the preparation raw materials of the upper surface layer, the core layer, the lower surface layer and the lower surface layer into corresponding extruders in die heads, and extruding the five corresponding raw materials from the die heads through corresponding connecting pipes to form a cast sheet with the thickness of 1-2 mm; the temperature of the single-screw extruder corresponding to the upper surface layer is set to be 230 ℃, the temperature of the extruder corresponding to the next surface layer is set to be 250 ℃, the temperature of the extruder corresponding to the last surface layer is set to be 250 ℃, the temperature of the extruder corresponding to the next surface layer is set to be 230 ℃, the temperature of the extruder corresponding to the core layer is set to be 240 ℃, and the temperature of the die head is set to be 250 ℃;
3) sequentially carrying out longitudinal stretching, transverse stretching, rolling, corona treatment, aging treatment and slitting on the cast sheet obtained in the step 2) to finally obtain a product; wherein, during longitudinal stretching, the temperature of the preheating zone is 135 ℃, the temperature of the stretching roller is 128 ℃, the stretching magnification is 5 times, and the temperature of the shaping roller is 135 ℃; during transverse stretching, the temperature of a preheating zone is 176 ℃, the temperature of a stretching zone is 162 ℃, the temperature of a shaping zone is 175 ℃, the temperature of a cooling zone is indoor temperature, and the maximum stretching ratio of the thick sheet is 9 times; during corona treatment, the corona power of the upper surface is 44Wmin/m, and the corona power of the lower surface is 30 Wmin/m. .
The thickness of the finally prepared mail-order express film is 33.63 mu m, and the density is 0.66g/cm 3; wherein the upper surface layer had a thickness of 1.23 μm, the previous surface layer had a thickness of 3.25 μm, the core layer had a thickness of 26.24 μm, the next surface layer had a thickness of 1.85 μm, and the lower surface layer had a thickness of 1.06 μm.
Comparative example 1
The present example is different from example 1 in that, at the time of extrusion, the temperature of the extruder corresponding to the upper surface layer was set to 180 ℃, the temperature of the extruder corresponding to the next skin layer was set to 190 ℃, the temperature of the extruder corresponding to the previous skin layer was set to 190 ℃, the temperature of the extruder corresponding to the next skin layer was set to 180 ℃, the temperature of the extruder corresponding to the core layer was set to 190 ℃, and the die temperature was set to 200 ℃.
The rest of the process was the same as in example 1.
The thickness of the finally prepared mail order express film is 45.72 mu m, and the density is 0.69g/cm3(ii) a Wherein the upper surface layer had a thickness of 1.23 μm, the former surface layer had a thickness of 3.09 μm, the core layer had a thickness of 38.11 μm, the next surface layer had a thickness of 2.08 μm, and the lower surface layer had a thickness of 1.21. mu.m.
Comparative example 2
The present example is different from example 1 in that, at the time of extrusion, the temperature of the extruder corresponding to the upper surface layer was set to 240 ℃, the temperature of the extruder corresponding to the next skin layer was set to 260 ℃, the temperature of the extruder corresponding to the previous skin layer was set to 240 ℃, the temperature of the extruder corresponding to the next skin layer was set to 240 ℃, the temperature of the extruder corresponding to the core layer was set to 250 ℃, and the die temperature was set to 260 ℃.
The rest of the process was the same as in example 1.
The thickness of the finally prepared mail order express film is 45.6 mu m, and the density is 0.7g/cm3(ii) a Wherein the upper surface layer had a thickness of 1.08 μm, the former surface layer had a thickness of 3.03 μm, the core layer had a thickness of 38.39 μm, the next surface layer had a thickness of 1.93 μm, and the lower surface layer had a thickness of 1.17 μm.
Performance testing
Test 1
The comparison between the mail-order express delivery film prepared in example 1 and the white cardboard as the paper express packaging paper base material commonly used in the market shows the following table 2:
TABLE 2 comparison of express delivery films and white cardboard for mail order
| Mail order express delivery film | White cardboard | |
| Water-proof property | Good taste | Good taste |
| Moisture barrier | Difference (D) | Is preferably used |
| Tear resistance | Good taste | In general |
| Need glue to seal | Whether or not | Is that |
| Density (g/cm)3) | 0.71 | 1.3 |
Test example 2
The examples 1, 2 and the commercially available low density polyethylene PE were subjected to the relevant strength property tests as follows:
(1) tensile strength measurement and elongation at break measurement: the method is carried out according to a test method of GB/T1040.3-2006 'determination of tensile property of plastic film', the tensile speed (no load) is (250 +/-50) mm/min, and a sample adopts an IV type (long strip); 160mm (length) × 15mm (width), gauge length 100 mm.
(2) And (3) measuring the thermal shrinkage rate: the method is carried out according to the method required by the clause 5.6 in the BB/T0002-2008 < biaxially oriented polypropylene pearlescent film >.
(3) And (3) light transmittance measurement: according to the relevant requirements in the GB/T2410-2008 transparent plastic light transmittance and haze test method.
(4) And (3) thickness measurement: according to the relevant requirements of the GB/T6672-2001 "mechanical measurements of the thickness of Plastic films and sheets".
The test results are shown in table 3 below:
TABLE 3
In conclusion, compared with paper express packages, the environment-friendly mail-order express film provided by the invention has better heat sealing performance, does not need to be sealed by glue, reduces environmental pollution caused by using a large amount of glue, and has excellent waterproof and moisture-proof performance, tear resistance and lower density. Compared with low-density Polyethylene (PE) film packaging, the polyethylene film packaging film has better light-shielding property, can effectively protect the privacy of consumers, reduces downstream processing procedures, reduces the production cost, and has higher mechanical property, lower deformation, lower heat shrinkage property and lower density. The method meets the performance requirements of the current mail-order film, solves the problems in the prior art, has simple preparation method and process, does not need gluing or blackening treatment, has low cost and has higher application value.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An environment-friendly mail-order express delivery film is characterized by comprising an upper surface layer, a core layer, a lower surface layer and a lower surface layer from top to bottom,
the preparation raw material of the upper surface layer is extinction master batch;
the preparation raw materials of the previous surface layer comprise homopolymerized polypropylene and pearl master batch;
the core layer is prepared from the raw materials of homo-polypropylene, titanium dioxide master batches, pearlescent master batches and an antistatic agent;
the preparation raw materials of the next surface layer comprise extinction master batch and titanium dioxide master batch;
the preparation raw materials of the lower surface layer comprise a heat-sealing master batch and an anti-sticking agent.
2. An environment-friendly mail order express delivery film according to claim 1,
in the last surface layer, the pearl master batch accounts for 1-8% of the total weight of the raw materials for preparing the last surface layer;
in the next surface layer, the titanium dioxide master batch accounts for 1-5% of the total weight of the preparation raw materials of the next surface layer.
3. An environment-friendly mail order express delivery film according to claim 1,
in the core layer, the weight percentages of the raw materials are as follows: 1-5% of titanium dioxide master batch, 15-30% of pearl master batch, 0.1-2% of antistatic agent and the balance of homopolymerized polypropylene.
4. An environment-friendly mail order express delivery film according to claim 1,
in the lower surface layer, the heat-seal master batch accounts for 88-99% of the total weight of the raw materials for preparing the lower surface layer.
5. An environment-friendly mail order express delivery film according to claim 1,
the thickness of the upper surface layer is 1-2.5 mu m;
the thickness of the previous surface layer is 2-5 mu m;
the thickness of the core layer is 25-38 mu m;
the thickness of the next subsurface layer is 1-3 μm;
the thickness of the lower surface layer is 1-2 μm;
the total thickness of the mail order express delivery film is 30-50 mu m.
6. A preparation method of an environment-friendly mail order express delivery film according to any one of claims 1 to 5, which is characterized by comprising the following steps:
1) weighing the following raw materials: weighing the preparation raw materials of the upper surface layer, the last surface layer, the core layer, the next surface layer and the lower surface layer according to the proportion, and respectively mixing uniformly for later use;
2) extruding: respectively adding the preparation raw materials of the upper surface layer, the core layer, the lower surface layer and the lower surface layer into corresponding extruders in die heads, and jointly extruding the five corresponding raw materials from the die heads through corresponding connecting pipes to form a cast sheet; wherein, the temperature of the extruder corresponding to the upper surface layer is set to be 190-230 ℃, the temperature of the extruder corresponding to the next surface layer is set to be 200-250 ℃, the temperature of the extruder corresponding to the last surface layer is set to be 200-250 ℃, the temperature of the extruder corresponding to the next surface layer is set to be 190-230 ℃, the temperature of the extruder corresponding to the core layer is set to be 200-240 ℃, and the temperature of the die head is set to be 210-250 ℃;
3) and (3) sequentially carrying out longitudinal stretching, transverse stretching, rolling, corona treatment, aging treatment and slitting on the cast sheet obtained in the step 2) to finally obtain the product.
7. The method for preparing the environment-friendly mail-order express delivery film according to claim 6, wherein in the step 2), the extruder corresponding to the core layer is a double-screw extruder, and the raw materials for preparing the core layer are added into the double-screw extruder for plasticizing, after redundant air is removed, secondary plasticizing, metering and filtering are performed; the extruders corresponding to the upper surface layer, the last surface layer, the next surface layer and the lower surface layer are single-screw extruders; five layers of corresponding raw materials are extruded from a die head together through corresponding connecting pipes to form a cast sheet with the thickness of 1-2 mm.
8. The method as claimed in claim 6, wherein in the step 3), the temperature of the preheating zone is 120-135 ℃, the temperature of the stretching roller is 125-128 ℃, the stretching ratio is 4.0-5.0, and the temperature of the sizing roller is 100-135 ℃ during the longitudinal stretching.
9. The method as claimed in claim 6, wherein in the step 3), the temperature of the preheating zone is 164-.
10. The method for preparing an environment-friendly mail order express delivery film according to claim 6, wherein in the step 3), the corona power is 30-50Wmin/m during corona treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210130019.2A CN114454581A (en) | 2022-02-11 | 2022-02-11 | Environment-friendly mail-order express delivery film and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210130019.2A CN114454581A (en) | 2022-02-11 | 2022-02-11 | Environment-friendly mail-order express delivery film and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117866255A (en) * | 2023-12-29 | 2024-04-12 | 佛山建发瑞通科技有限公司 | Biaxially oriented polypropylene electrical film and preparation method thereof |
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| CN201614085U (en) * | 2009-11-25 | 2010-10-27 | 天津市天塑科技集团有限公司技术中心 | Five-layer pearlised film with high heat sealing performance |
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| CN117866255A (en) * | 2023-12-29 | 2024-04-12 | 佛山建发瑞通科技有限公司 | Biaxially oriented polypropylene electrical film and preparation method thereof |
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