High-performance shrinkage film and preparation method thereof

A shrink film, high-performance technology, applied in the field of packaging film, can solve the problems of the shrinking furnace temperature is not too high, the shrinkage rate is not high, the shrinkage effect is not good, etc., to achieve the effect of fast shrinkage, high transparency and high sealing strength

Inactive Publication Date: 2019-05-21

深圳市致新包装有限公司

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AI-Extracted Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a high-performance shrink film and its preparation method, which is integrated by biaxial stretching after five layers of co-extrusion, so ...

Method used

The present invention adopts the preparation method that the outer layer, the inner three layers, and the inner layer five layers are co-extruded and formed into one through biaxial stretching, and the product made by this method has good shrinkage, thermal slipperiness and high transparency , can reach a shrinkage ratio of...

Abstract

The invention discloses a high-performance shrinkage film and a preparation method thereof. The invention adopts the preparation method of biaxial stretching into a whole after five layers of co-extrusion. The prepared shrinkage film comprises a first layer, a second layer, a third layer, a fourth layer and a fifth layer which are sequentially arranged; the first layer is an outer surface layer; the second layer, the third layer and the fourth layer are three inner layers; the fifth layer is an inner surface layer; the weight ratio of the outer surface layer to the inner surface layer is 1:1;the outer surface layer and the inner surface layer totally comprise 30 parts by weight of polypropylene and 5 parts by weight of aid; the inner three layers comprise 30-65 parts by weight of linear low-density polyethylene and 0-35 parts by weight of ultralow-density polyethylene; the linear low-density polyethylene and the ultralow-density polyethylene totally are 65 parts by weight. The shrinkage film has good shrinkage rate and thermal slip performance and high transparency, can reach 70 percent of shrinkage ratio at a temperature of 130 DEG C, and is high in shrinkage speed, high in tearing strength and high in sealing strength.

Application Domain

Synthetic resin layered products

Technology Topic

PolypropyleneLow-density polyethylene +5

Examples

Experimental program(3)

Example Embodiment

[0026] Example 1

[0027] In parts by weight, the raw materials include: 30 parts of polypropylene, 30 parts of linear low-density polyethylene, 35 parts of ultra-low-density polyethylene, 2 parts of slip agent, and 3 parts of blocking agent. Among them, 30 parts of polypropylene (PP) include 20 parts of FS6612 polypropylene and 10 parts of 3980FL polypropylene.

[0028] FS6612 polypropylene is produced by Singapore Polyolefin Company, the model is FS6612;

[0029] 3980FL polypropylene is produced by Exxon Mobil Corporation, the model is 3980FL.

[0030] Linear low density polyethylene (LLDPE), produced by Dow Chemical, model 2045G;

[0031] Ultra-low density polyethylene (ULDPE), manufactured by Dow Chemical, model 4203.

[0032] The production process of the five-layer biaxially oriented polyolefin heat shrinkable film is:

[0033] Step A: Weigh the materials needed for the outer surface layer, the inner three layers, and the inner surface layer, and premix them separately and mix them evenly.

[0034] Step B: The uniformly stirred mixture is respectively sent to the extruder for processing to obtain a plasticized and homogenized melt. The melt is transported through a pipeline, filtered by a filter, and then distributed through a runner and a die to be extruded into a tube blank. Blow the film into air to form a five-layer bubble. In this step, the blow-up ratio of the blown film with air is 1:5.8.

[0035] Step C: The five-layer film bubble is stretched in both directions in the longitudinal direction and the transverse direction, and is sculpted and rewinded after lamination to obtain a shrink film.

[0036] Step D: After cooling, the shrink film produced in step C is divided into corresponding sizes by a sub-winding machine, and then folded into a corresponding size roll film by a half-folding machine, and then directly used in automatic packaging equipment or processed by a bag cutting machine into corresponding shrinkage Bag products.

[0037] The material weight ratio of the outer surface layer, inner three layers, and inner surface layer of the formed high-strength shrink film is 3.5:13:3.5. After testing, the shrinkage temperature is 120°C and the duration is 20 seconds, the shrinkage rate is 63.4%;

[0038] When the shrinkage temperature is 130°C and the duration is 20 seconds, the shrinkage rate is 71.8%;

[0039] When the shrinkage temperature is 140°C and the duration is 20 seconds, the shrinkage rate is 74.7%.

Example Embodiment

[0040] Example 2

[0041] In parts by weight, the raw materials include: 30 parts of polypropylene, 35 parts of linear low-density polyethylene, 30 parts of ultra-low-density polyethylene, 2 parts of slip agent, and 3 parts of blocking agent. Among them, 30 parts of polypropylene (PP) include 20 parts of FS6612 polypropylene and 10 parts of F5606 polypropylene.

[0042] FS6612 polypropylene is produced by Singapore Polyolefin Company, the model is FS6612;

[0043] F5606 polypropylene is produced by China National Petroleum Corporation, the model is F5606;

[0044] Linear low density polyethylene (LLDPE), produced by Dow Chemical, model 2045G;

[0045] Ultra-low density polyethylene (ULDPE), produced by Dow Chemical, model 4203.

[0046] The production process of the five-layer biaxially oriented polyolefin heat shrinkable film is:

[0047] Step A: Weigh the materials needed for the outer surface layer, the inner three layers, and the inner surface layer, and premix them separately and mix them evenly.

[0048] Step B: The uniformly stirred mixture is respectively sent to the extruder for processing to obtain a plasticized and homogenized melt. The melt is transported through a pipeline, filtered by a filter, and then distributed through a runner and a die to be extruded into a tube blank. Blow the film into air to form a five-layer bubble. In this step, the blow-up ratio of the blown film with air is 1:5.8.

[0049] Step C: The five-layer film bubble is stretched in both directions in the longitudinal direction and the transverse direction, and is sculpted and rewinded after lamination to obtain a shrink film.

[0050] Step D: After cooling, the shrink film produced in step C is divided into corresponding sizes by a sub-winding machine, and then folded into a corresponding size roll film by a half-folding machine, and then directly used in automatic packaging equipment or processed by a bag cutting machine into corresponding shrinkage Bag products.

[0051] The material weight ratio of the outer surface layer, the inner three layers, and the inner surface layer of the formed high-strength shrink film is 3.5:13:3.5. After testing, the shrinkage temperature is 120°C and the duration is 20 seconds, the shrinkage rate is 59.2%;

[0052] When the shrinkage temperature is 130°C and the duration is 20 seconds, the shrinkage rate is 67.1%;

[0053] When the shrinkage temperature is 140°C and the duration is 20 seconds, the shrinkage rate is 71.6%.

Example Embodiment

[0054] Example 3

[0055] In parts by weight, the raw materials include: 30 parts of polypropylene, 65 parts of linear low-density polyethylene, 3 parts of slip agent, and 2 parts of blocking agent. Among them, 30 parts of polypropylene (PP) include 25 parts of FS6612 polypropylene and 10 parts of 3980FL polypropylene.

[0056] FS6612 polypropylene is produced by Singapore Polyolefin Company, the model is FS6612;

[0057] 3980FL polypropylene is produced by Exxon Mobil, the model is 3980FL;

[0058] Linear low density polyethylene (LLDPE), produced by Dow Chemical, model 2645;

[0059] The production process of the five-layer biaxially oriented polyolefin heat shrinkable film is:

[0060] Step A: Weigh the materials needed for the outer surface layer, the inner three layers, and the inner surface layer, and premix them separately and mix them evenly.

[0061] Step B: The uniformly stirred mixture is respectively sent to the extruder for processing to obtain a plasticized and homogenized melt. The melt is transported through a pipeline, filtered by a filter, and then distributed through a runner and a die to be extruded into a tube blank. Blow the film into air to form a five-layer bubble. In this step, the blow-up ratio of the blown film with air is 1:5.8.

[0062] Step C: The five-layer film bubble is stretched in both directions in the longitudinal direction and the transverse direction, and is sculpted and rewinded after lamination to obtain a shrink film.

[0063] Step D: After cooling, the shrink film produced in step C is divided into corresponding sizes by a sub-winding machine, and then folded into a corresponding size roll film by a half-folding machine, and then directly used in automatic packaging equipment or processed by a bag cutting machine into corresponding shrinkage Bag products.

[0064] The material weight ratio of the outer surface layer, the inner three layers, and the inner surface layer of the formed high-strength shrink film is 3.5:13:3.5. After testing, the shrinkage temperature is 120°C and the duration is 20 seconds, the shrinkage rate is 60.1;

[0065] When the shrinkage temperature is 130°C and the duration is 20 seconds, the shrinkage rate is 68.3%;

[0066] When the shrinkage temperature is 140°C and the duration is 20 seconds, the shrinkage rate is 72.9%.

[0067] The present invention adopts a preparation method of co-extruding the outer surface layer, the inner three layers, and the inner surface layer five layers into one body by bidirectional stretching. The product made by the method has good shrinkage, thermal slip and high transparency, and can be used in The shrinkage ratio reaches 70% at 130°C, and the shrinkage speed is fast, the tear strength is high, and the sealing strength is high. At the same time, it perfectly combines the various characteristics of the molecule without destroying the molecular structure, which can effectively solve the shrinkage rate in the shrink packaging process. It is not high, the shrinking effect is not good, and the shrinking furnace temperature is not easy to be too high, so it is suitable for automatic and semi-automatic shrink packaging equipment.

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High-performance shrinkage film and preparation method thereof

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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