TWM645078U - Bi-axially oriented polypropylene functional film with environmental protection and plastic reduction effect - Google Patents

Abstract

This creation is about a biaxially stretched polypropylene with polypropylene as the main body, which has environmentally friendly and plastic-reducing effects. The functional film of the fruit includes: a core layer and two surface layers, the two surface layers are respectively located on the upper and lower surfaces of the core layer; wherein, the core layer and the two surface layers include one of ethylene, propylene, and butylene. Or two or more homopolymerized or copolymerized polymers or mixtures of these, and containing PIR (Post Industrial Recycle) recycled materials, and are made by co-extrusion and biaxial stretching. In this way, this environmentally friendly plastic-reduced film containing PIR recycled materials can be derived into products with various uses. Such as environmentally friendly plastic-reducing film (for tapes, bread bags, etc.), environmentally-friendly plastic-reducing heat-sealing film (straw packaging, etc.), environmentally-friendly plastic-reducing anti-fog heat-sealing film (hot and cold food packaging, etc.).

Description

Biaxially stretched polypropylene functional film with environmentally friendly plastic reduction effect

This biaxially stretched polypropylene functional film with environmentally friendly plastic-reducing effects is an environmentally friendly packaging material with polypropylene as the main body.

"Energy conservation, environmental protection, and environmental sustainability" are currently the hottest topics in the world. Plastic products, in particular, are widely used in the packaging of various products because of their light weight, durability, low price, and mass production. However, they also have Various environmental pollution problems have emerged, such as ocean and soil pollution; the international community has also begun to advocate and promote relevant recycling standards for plastic products, and encourages new plastic products to add a certain proportion of plastic recycled materials to achieve the goal of "plastic reduction".

In particular, plastic films are often used to package various fresh ingredients or cooked foods because of their thinness and good toughness. Also, because of their thinness and thinness, the film surface is difficult to clean after being contaminated. Therefore, in the current domestic plastic recycling system, they are difficult to recycle and have low value. Except for a small amount that is burned in incinerators as garbage, most of them are not fully recycled and abandoned outdoors, causing environmental pollution.

The main purpose of creating a biaxially stretched polypropylene functional film with environmentally friendly plastic reduction effect is to provide a multi-layer film containing plastic recycling material - PIR (Post Industrial Recycle) recycled material. It has a three-layer structure and contains a certain proportion of PIR recycled material, this PIR recycled material is added during production The resin masterbatch of the core layer is pre-mixed, and is made by three-layer co-extrusion through a T-shaped die and then biaxially stretched. The film has the effect of environmentally friendly plastic reduction during molding, and the film has good transparency and can be used for packaging. It will not affect the appearance of the contents and can be clearly seen.

In order to achieve the above purpose, this invention provides a biaxially stretched polypropylene functional film with environmentally friendly plastic-reducing effect. It is an environmentally-friendly plastic-reduced film, including a core layer and two surface layers, and the two surface layers are respectively located on the core layer and Lower surface; wherein, the core layer and the second surface layer contain one or two or more homopolymers or copolymers of ethylene, propylene or butylene, or a mixture thereof, and are processed by co-extrusion and biaxial stretching. Become.

In some embodiments, the biaxially stretched polypropylene functional film of the present invention has an environmentally friendly plastic-reducing effect. The thickness of the two surface layers can each be 1~3 μm, and the thickness of the core layer can be 13~54 μm, and the total thickness can be 15~60μm.

In some embodiments, the invention creates a functional film of biaxially stretched polypropylene with an environmentally friendly plastic-reducing effect. The core layer and the two surface layers contain polypropylene. The polypropylene has a crystallinity of more than 94% and a melt index (MI). ) is a homopolymer between 2~9 (g/10min).

In some embodiments, this invention creates a biaxially stretched polypropylene functional film with an environmentally friendly plastic-reducing effect. In the core layer, the layer contains a certain proportion of PIR recycled material. This PIR recycled material accounts for the weight of the layer. 30~60% of the percentage.

In some embodiments, the biaxially stretched polypropylene functional film with environmentally friendly plastic reduction effect of the present invention contains a certain proportion of PIR recycled materials, so that the film can have environmentally friendly plastic reduction effect during molding and can be used for packaging. It will not affect the appearance of the contents, can be clearly seen, and does not require complicated manufacturing processes, which is more conducive to the promotion of the packaging market.

In some embodiments, the biaxially stretched polypropylene of the present invention has the function of environmentally friendly plastic reduction. It is a flexible film. Among the two surface layers, at least one surface can be corona treated, and its wetting tension value is 36~44 Dyne/cm. The main purpose of corona treatment is to modify the wetting tension of the surface to facilitate subsequent printing processing. However, the surface modification methods that can be applied to this invention include but are not limited to corona treatment. In order to obtain different surface properties, flame treatment, plasma treatment, or other equivalent surface modification technologies can also be used.

In some embodiments, the biaxially stretched polypropylene functional film with an environmentally friendly plastic-reducing effect can also be derived into an environmentally-friendly plastic-reducing heat-sealing film and an environmentally-friendly plastic-reducing anti-fog heat-sealing film.

In some embodiments, the biaxially stretched polypropylene functional film of the present invention has an environmentally friendly plastic-reducing effect. At least one of the two surface layers can further include a resin with a heat-sealable effect in the layer body, and its heat-sealable temperature is 80~150℃, the heat-sealable resin can be selected from (ethylene/propylene) copolymer, (ethylene/propylene/butylene) copolymer, polyolefin elastomer, or a mixture of these.

In some embodiments, the biaxially stretched polypropylene functional film with environmentally friendly plastic reduction effect can be further added with 1 to 10% by weight of anti-fog masterbatch in the core layer. The anti-fog masterbatch component Glycerin fatty acid esters, sorbitol fatty acid esters, ethylene oxide adducts of glycerol monoesters or sorbitan monoesters, or other equivalent substances may be used.

In some embodiments, the invention is a biaxially stretched polypropylene functional film with an environmentally friendly plastic-reducing effect. At least one of the two surface layers can further include a resin with a heat-sealable effect in the layer body, and in the core layer By adding 1~10% weight percentage of anti-fog masterbatch into the body, the functional film of biaxially stretched polypropylene with environmentally friendly plastic reduction effect not only has a heat-sealable effect, but also has anti-fog effect. It is more suitable for packaging all kinds of fresh ingredients or cooked food.

1: Biaxially stretched polypropylene functional film with environmentally friendly plastic reduction effect

2: Core layer

3: Surface layer

41: Main extrusion twin-screw extruder

42: Auxiliary extrusion single screw extruder

43:T-shaped die head

5: Longitudinal extension equipment

51:Longitudinal extension of preheating area

52: Longitudinal extension area

53:Longitudinal extension shaping area

6: Lateral extension equipment

61: Horizontally extended preheating area

62: Lateral extension area

63: Laterally extended shaping area

7:Corona treatment device

8: Rewinding device

Figure 1 is a cross-sectional view of this biaxially stretched polypropylene functional film with environmentally friendly plastic reduction effect.

Figure 2 is a schematic diagram of the production method of this biaxially stretched polypropylene functional film with environmentally friendly plastic reduction effect.

The present invention can be fully understood by the following embodiments, so that people familiar with the art can complete it. However, the implementation of the present invention is not limited by the following examples. People familiar with the art can still implement it. If other embodiments are deduced based on the spirit of the disclosed embodiments, these embodiments shall fall within the scope of this invention.

It is important to note that in the following description, similar components will be represented by the same component symbols. Furthermore, the drawings of this creation are only for schematic illustration, they are not necessarily drawn to scale, and not all details may be presented in the drawings.

As shown in Figure 1, the biaxially stretched polypropylene functional film 1 with environmentally friendly plastic reduction effect of this invention includes a core layer 2 and two surface layers 3. The two surface layers 3 are respectively located above and below the core layer 2. On the surface, the core layer 2 includes a polypropylene, which is a homopolymer with a crystallinity of more than 94% and a melt index (MI) between 2 and 9 (g/10min), and the three-layer structure is It is made by co-extrusion and biaxial stretching. The thickness of the two surface layers 3 is 2 μm and 2 μm respectively, and the thickness of the core layer 2 is 14 μm, so the total thickness is 18 μm.

The core layer 2 of the biaxially stretched polypropylene functional film with environmentally friendly plastic reduction effect contains PIR (Post Industrial Recycle) recycled material in the layer body. The PIR recycled material accounts for 40% of the weight percentage of the layer body. .

In another embodiment of the invention, the biaxially stretched polypropylene functional film with environmentally friendly plastic reduction effect, the second surface layer 3 can further include a resin with a heat-sealable effect in the layer body, which can be heat-sealable and heat-sealable. The temperature is 80~150°C. The heat-sealable material can be selected from (ethylene/propylene) copolymer, (ethylene/propylene/butylene) copolymer, polyolefin elastomer, or a mixture thereof.

In another embodiment, the biaxially stretched polypropylene functional film with environmentally friendly plastic reduction effect of the invention can further contain an anti-fog masterbatch of 1 to 10% by weight in the two core layers. The anti-fog masterbatch The granular ingredients include glycerol fatty acid esters, sorbitan fatty acid esters, ethylene oxide adducts of glycerol monoesters or sorbitan monoesters or other equivalent substances.

In another embodiment, a functional film of biaxially stretched polypropylene with an environmentally friendly plastic-reducing effect is created. The second surface layer 3 of the layer can contain a resin with a heat-sealable effect, and the heat-sealable temperature is 80~150°C. , the core layer and the second layer can further contain an anti-fog masterbatch in a weight percentage of 1 to 10% to form a functional film that has environmentally friendly plastic reduction, heat-sealability and anti-fog effects.

In another embodiment, any one of the two surface layers 3 of the biaxially stretched polypropylene functional film with environmentally friendly plastic-reducing effect can be further corona-treated, so that the wetting tension of the surface layer reaches 39 Dyne/cm .

As shown in Figure 2, the manufacturing method of the biaxially stretched polypropylene functional film with environmentally friendly plastic reduction effect includes the following steps: (A) Combine PIR (Post Industrial Recycle) recycled material, anti-fog masterbatch and resin After thorough mixing, it is used as the raw material for the core layer and the surface layer, and is co-extruded into three layers to form a (surface layer/core layer/surface layer) structure; and (B) biaxial stretching is performed.

To further explain in detail, the manufacturing method of the biaxially stretched polypropylene functional film with environmentally friendly plastic reduction effect includes the following steps: (1) Mix PIR (Post Industrial Recycle) recycled materials and anti-fog masterbatch as required Mix it with the resin in a certain proportion (the mixing proportion is as shown in Table 1) to achieve the dispersion requirements and have the functions of environmentally friendly plastic reduction and anti-fogging; (2) After extrusion through the upper and lower flow channels of the T-shaped die 43, it enters the cooling molding equipment 44, whose working temperature is 15°C~70°C. The cooling molding equipment 44 then cools the three-layer high-temperature laminate into a three-layer laminate film. The three-layer laminated film is then introduced into the longitudinal stretching device 5, where the cooling forming device 44 includes a cooling wheel and a water tank; (3) After being introduced into the longitudinal stretching device 5, it is first preheated at a temperature of 100~160°C. After the three-layer laminated film is softened, the three-layer laminated film is further extended by 3 to 7 times of longitudinal magnification and tempered and shaped, and then the three-layer laminated film is introduced into the transverse stretching equipment 6. The longitudinal stretching equipment 5 includes a longitudinal stretching preheating zone 51, Longitudinal extension extension area 52, and longitudinal extension shaping area 53; (4) After introducing the transverse extension equipment 6, first preheat and soften it at a temperature of 100~200°C, stretch it at a transverse magnification of 4~12 times and temper it After shaping and cooling at 20°C to 80°C, it becomes a biaxially stretched three-layer laminated film, and then is introduced into the corona treatment device 7. The lateral extension equipment 6 includes a lateral extension preheating zone 61, a lateral extension extension zone 62, and a lateral extension zone 62. Extend the shaping area 63; (5) Use a high-frequency discharge device with a power of 10~120W to corona-treat the three-layer laminated film, so that the surface of the three-layer laminated film can evenly wet to 36~44 Dyne/cm Tension value; (6) The film after corona treatment is rolled up by the winding equipment 8, and then divided into roll-type films of various widths and lengths according to the end requirements.

The biaxially stretched polypropylene functional film with environmentally friendly plastic reduction effect produced by the above-mentioned manufacturing method has the physical properties shown in Table 2:

The above is only one of the preferred embodiments of this invention, and it cannot be used to limit the scope of this invention; that is, all equivalent changes and modifications made based on the patent scope of this invention should still fall within the scope of this invention. within the scope covered by the patent.

1: Biaxially stretched polypropylene functional film with environmentally friendly plastic reduction effect

2: Core layer

3: Surface layer

Claims (10)

A biaxially stretched polypropylene functional film with environmentally friendly plastic reduction effect, including: a core layer; and two surface layers, the two surface layers are respectively located on the upper and lower surfaces of the core layer, wherein the core layer and the two surface layers include A polypropylene, and the layer body of the core layer further contains a PIR (Post Industrial Recycle) recycled material, and the PIR recycled material accounts for 30 to 60% of the weight percentage of the layer body. The biaxially stretched polypropylene functional film with environmentally friendly plastic reduction effect as described in claim 1, wherein the polypropylene has a crystallinity of more than 94% and a melt index (MI) between 2 and 9 (g/10min) Homopolymer. The biaxially stretched polypropylene functional film with environmentally friendly plastic reduction effect as described in claim 1, wherein the surface of at least one of the two surface layers can be further corona treated to make the wetting tension value be 36~44 Dyne/ cm. The biaxially stretched polypropylene functional film with environmentally friendly plastic reduction effect as described in claim 1, wherein the thickness of the two surface layers is 1~3 μm, the thickness of the core layer is 13~54 μm, and the total thickness is 15~60 μm. The biaxially stretched polypropylene functional film with environmentally friendly plastic reduction effect as described in claim 1, wherein at least one of the two surface layers further contains a resin with a heat-sealable effect, and the heat-sealable effect is The heat-sealable temperature of the resin is 80~150°C. The heat-sealable resin includes one of (ethylene/propylene) copolymer, (ethylene/propylene/butylene) copolymer, polyolefin elastomer, or a mixture of their combinations . The biaxially stretched polypropylene functional film with environmentally friendly plastic reduction effect as described in claim 5, wherein the surface of at least one of the two surface layers can be further corona treated to make the wetting tension value be 36~44 Dyne/ cm. The biaxially stretched polypropylene functional film with environmentally friendly plastic reduction effect as described in claim 1, wherein the core layer further contains 1 to 10% by weight of an anti-fog masterbatch, and the anti-fog masterbatch ingredients Contains glycerin fatty acid esters, sorbitan fatty acid esters, glycerol monoesters, ethylene oxide adducts of sorbitan monoesters or other equivalent substances. The biaxially stretched polypropylene functional film with environmentally friendly plastic reduction effect as described in claim 7, wherein the surface of at least one of the two surface layers can be further corona treated to make the wetting tension value be 36~44 Dyne/ cm. The biaxially stretched polypropylene functional film with environmentally friendly plastic reduction effect as described in claim 1, wherein the layer of at least one of the two surface layers further contains a resin with a heat-sealable effect, and the layer of the core layer The body further contains 1 to 10% by weight of an anti-fog masterbatch. The biaxially stretched polypropylene functional film with environmentally friendly plastic reduction effect as described in claim 9, wherein the surface of at least one of the two surface layers can be further corona treated to make the wetting tension value be 36~44 Dyne/ cm.