CN113978077A - Composite PE outer film and composite packaging film - Google Patents

Composite PE outer film and composite packaging film Download PDF

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Publication number
CN113978077A
CN113978077A CN202111131268.5A CN202111131268A CN113978077A CN 113978077 A CN113978077 A CN 113978077A CN 202111131268 A CN202111131268 A CN 202111131268A CN 113978077 A CN113978077 A CN 113978077A
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China
Prior art keywords
composite
surface layer
film
density polyethylene
membrane
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CN202111131268.5A
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Chinese (zh)
Inventor
邓浩强
张海明
王辉
刘星东
俞国星
杨泽刚
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Foshan New Changsheng Plastics Film Co Ltd
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Foshan New Changsheng Plastics Film Co Ltd
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Priority to CN202111131268.5A priority Critical patent/CN113978077A/en
Publication of CN113978077A publication Critical patent/CN113978077A/en
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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
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0008—Electrical discharge treatment, e.g. corona, plasma treatment; wave energy or particle radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
    • 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
    • B32B2250/24—All layers being polymeric
    • B32B2250/242—All polymers belonging to those covered by group B32B27/32
    • 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
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/31—Heat sealable
    • 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
    • B32B2307/75—Printability
    • 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
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)

Abstract

The invention discloses a composite PE outer membrane and a composite packaging membrane, wherein the outer membrane is a composite membrane prepared by a co-extrusion film blowing process, and the composite membrane is of a three-layer sandwich structure and comprises an upper surface layer, a lower surface layer and a middle layer, wherein the upper surface layer and the lower surface layer are identical in components and proportion, and the middle layer is clamped between the upper surface layer and the lower surface layer; the upper surface layer, the middle layer and the lower surface layer respectively comprise high-density polyethylene, medium-density polyethylene and an auxiliary agent, and the middle layer also comprises linear low-density polyethylene; the upper surface layer and the lower surface layer are both processed by corona. The outer film has good stiffness, temperature resistance and mechanical property, and can meet the requirements of decoration and protection. The composite packaging film is formed by compounding the composite PE outer film with higher heat sealing temperature and the inner film made of PE materials, so that the packaging film is made of the PE materials, recycling is convenient, and meanwhile, the heat sealing temperature difference between the composite PE outer film and the inner film is greater than 30 ℃, so that a better heat sealing effect is achieved.

Description

Composite PE outer film and composite packaging film
Technical Field
The invention relates to the technical field of film packaging materials, in particular to a composite PE outer film and a composite packaging film.
Background
The packaging bag or the packaging film can protect or decorate the packaged product or article, the existing packaging bag or packaging film is usually a high polymer material with a composite structure, generally comprises an inner film and an outer film, and under the normal condition, the inner film is used for contacting the packaged product or article, and a high polymer film with soft texture and low barrier or heat sealing temperature, such as a PE film or a film containing EVOH (ethylene/vinyl alcohol copolymer) material, can be selected; the outer film is compounded outside the inner film for providing a bearing effect, or playing a role in protecting the inner film and a packaged object, and decorating or explaining, so the outer film is usually made of a material with better stiffness or temperature resistance, and is usually subjected to corona treatment, so that the outer film has better properties of bearing, printing patterns, compounding with the inner film and the like, and meets the requirements on mechanical and thermal properties during processing and use. The surface of the product is usually treated by corona treatment, so that decorative patterns, patterns or characters and the like can be printed on the surface of the product, and the product plays a role in decorating or explaining the packaged product.
In the prior art, because the PE has the advantages of light weight, impact resistance, good wear resistance, no toxicity, no odor, good transparency and the like, the PE can meet the requirements of food packaging materials, and therefore, the PE is widely used as an inner film of a packaging bag or a packaging film. In order to ensure that the packaging bag or the packaging film of the PE inner film has good stiffness, in the prior art, a thin film or a composite film made of aluminum foil, PET, nylon, OPP or the like is generally selected as the outer film. The packaging film or the packaging bag has good stiffness and temperature resistance, can meet the requirements of load bearing and inner film heat sealing processing, can not stick a knife when sealing the film, and can play a role in protecting and decorating products. However, the existing packaging film and packaging bag compounded by PE and other materials have the defect of difficult recycling because the outer film and the inner film are not made of the same material, and do not meet the requirements of sustainable development. In addition, in the conventional packaging bag and packaging film, only one surface of the outer film is usually subjected to corona treatment, and only one mode of inner printing or surface printing can be selected during use, so that the surface decoration treatment is limited.
In order to facilitate recycling, the prior art also adopts a PE inner film and a PE outer film which are made of single materials to compound so as to gradually replace non-single material composite films such as aluminum foil/PE, PET/PE or NY/PE and the like. However, the existing PE outer film has the defects of poor stiffness, poor temperature resistance and poor heat sealability, and due to the poor stiffness, the packaging film or the packaging bag is softer, shriveled and not stiff enough, the exhibition effect is poor, the packaging bag or the packaging film cannot play a role in protection, and meanwhile, the printing effect can be influenced, so that the overprinting is inaccurate; temperature resistance is poor, can make wrapping bag or packaging film be heated deformation easily when printing pattern or compound, causes the overprinting inaccurate, and the precision reduces, and the product is damaged even, unable printing or compound, and then leads to the product defective rate to improve, and the increase cost, simultaneously, temperature resistance is poor can make wrapping film and wrapping bag appear gluing sword phenomenon when the heat-seal, makes processing difficult to go on smoothly to lead to the product disability rate to promote greatly.
It is seen that improvements and enhancements to the prior art are needed.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a composite PE outer film and a composite packaging film, and aims to overcome the defects of poor stiffness, poor temperature resistance and poor heat sealability of a composite packaging bag or a packaging film made of a PE material in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a composite PE outer membrane is a composite membrane prepared by a co-extrusion film blowing process, and is of a three-layer sandwich structure and comprises an upper surface layer, a lower surface layer and a middle layer, wherein the upper surface layer and the lower surface layer are identical in components and proportion, and the middle layer is clamped between the upper surface layer and the lower surface layer; the upper surface layer, the middle layer and the lower surface layer respectively comprise high-density polyethylene, medium-density polyethylene and an auxiliary agent, and the middle layer also comprises linear low-density polyethylene; the upper surface layer and the lower surface layer are both processed by corona.
In the composite PE outer membrane, the upper surface layer and the lower surface layer respectively account for 10-30% of the total weight of the composite membrane, and the middle layer accounts for 40-80% of the total weight of the composite membrane.
The composite PE outer membrane of claim 1, wherein the additive is an additive masterbatch with polyethylene as a carrier, and the additive masterbatch comprises one or more of calcium carbonate, talc, silica, glass beads, mica, and fluorine-containing masterbatch.
In the composite PE outer membrane, the upper surface layer and the lower surface layer comprise the following components in parts by weight: 50-80 parts of high-density polyethylene, 10-50 parts of medium-density polyethylene and 0.2-5 parts of auxiliary agent master batch.
In the composite PE outer membrane, the middle layer comprises the following components in parts by weight: 40-80 parts of high-density polyethylene, 10-60 parts of linear low-density polyethylene, 10-40 parts of medium-density polyethylene and 0.2-2 parts of fluorine-containing master batch taking polyethylene as a carrier.
In the composite PE outer membrane, the density of the high-density polyethylene is 0.955-0.965 g/cm3。
In the composite PE outer membrane, the density of the medium-density polyethylene is 0.931-0.942 g/cm3。
A composite packaging film comprises an inner film and an outer film, wherein the inner film and the outer film are both PE films, and the outer film is the composite PE outer film.
In the composite packaging film, the thickness of the inner film is 30-70 mu m, and the thickness of the outer film is 40-100 mu m.
In the composite packaging film, the heat sealing temperature difference between the inner film and the outer film is more than 30 ℃.
Has the advantages that:
the invention provides a composite PE outer membrane and a composite packaging membrane, wherein the composite PE outer membrane is of a symmetrical sandwich structure and comprises an upper surface layer and a lower surface layer which are used for corona and a middle layer clamped in the middle, and the upper surface layer and the lower surface layer are both subjected to corona treatment, so that treatment of different printing modes such as compounding, inner printing or surface printing and the like can be realized, in addition, the high temperature resistance of the composite PE outer membrane can be further improved through double-sided corona treatment, the temperature difference between the outer membrane and an inner membrane made of a PE material is increased, and further, the inner membrane can be subjected to heat sealing at a higher temperature when the packaging membrane is subjected to heat sealing, and the phenomena of cutter sticking and denaturation of the outer membrane cannot occur. The composite packaging film is formed by compounding a composite PE outer film with a high heat-sealing temperature and an inner film made of PE materials, so that the packaging film is made of the PE materials, recycling is convenient, and meanwhile, the heat-sealing temperature difference between the composite PE outer film and the inner film is greater than 30 ℃, so that the packaging film has a good heat-sealing effect, the phenomenon of sticking a knife does not occur in the heat-sealing process, and the packaging film is not deformed after heat-sealing.
Detailed Description
The present invention provides a composite PE outer film and a composite packaging film, and in order to make the objects, technical solutions, and effects of the present invention clearer and clearer, the present invention will be further described in detail with reference to the following examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a composite PE outer membrane, which is used for being compounded with an inner membrane made of a PE material to form a composite packaging bag or a composite packaging membrane made of the PE material. The outer membrane is of a three-layer sandwich structure and comprises an upper surface layer, a lower surface layer and a middle layer, wherein the upper surface layer and the lower surface layer are arranged on the upper surface and the lower surface, the middle layer is clamped between the upper surface layer and the lower surface layer, the outer membrane is of a symmetrical structure, and the upper surface layer, the middle layer and the lower surface layer are prepared through a co-extrusion film blowing process and are formed in one step. Simultaneously, all pass through corona treatment to the upper surface layer of compound PE adventitia and lower top layer in the preparation process, consequently, obtain that compound PE adventitia all has corona characteristic at upper and lower surface, make the adventitia have symmetry performance on the one hand, at upper surface layer and lower top layer homoenergetic printing pattern or texture, simultaneously, through two-sided corona treatment, can strengthen the temperature resistance and the heat sealability of adventitia to corona effect is more lasting. The upper surface layer, the middle layer and the lower surface layer are all prepared from polyethylene materials and all comprise high-density polyethylene, medium-density polyethylene and an auxiliary agent, the stiffness and the high temperature resistance of the outer membrane are greatly improved by matching the high-density polyethylene with the medium-density polyethylene, so that the requirement of overprinting precision is met while the outer membrane has better bearing capacity, and the problem of insufficient pattern printing precision caused by poor temperature resistance is avoided. The middle layer contains linear low-density polyethylene besides high-density polyethylene and medium-density polyethylene, and the linear low-density polyethylene can enable the outer membrane to have better tensile strength, tear resistance and elongation, so that the dimensional stability of the outer membrane is better.
The compound PE adventitia of above-mentioned structure is through setting up upper epidermis, intermediate level and lower top layer to upper epidermis and lower top layer are the same material, and symmetrical structure, all carry out corona treatment to upper and lower top layer simultaneously, consequently, the compound PE adventitia that obtains, not only outward appearance and planarization can be better, can not take place the turn-up phenomenon, and at later stage printing or composite process, overprint precision and compound effect are better. Meanwhile, the composite PE outer membrane adopts the high-density polyethylene and the medium-density polyethylene which are both PE materials, so that the outer membrane and the inner membrane can be kept to be the same in material, subsequent recycling is facilitated, the stiffness and the temperature resistance of the outer membrane can be improved, and the heat sealing temperature of the outer membrane is increased to be more than 125 ℃, therefore, when the composite PE outer membrane is applied to heat sealing of a packaging membrane or a packaging bag, the phenomenon of knife adhesion cannot occur, the production can be smoothly carried out, and the yield is improved.
Specifically, in the composite PE outer film, the upper surface layer and the lower surface layer each account for 10% to 30% of the total weight of the composite film, and the intermediate layer accounts for 40% to 80% of the total weight of the composite film, by weight percentage. The middle layer is a main body layer of the outer membrane and mainly provides mechanical property for the outer membrane, so that the middle layer has a large proportion, and meanwhile, the mechanical property of the outer membrane is improved by adding linear low-density polyethylene into the middle layer.
In the composite PE outer membrane, the auxiliary agent is an auxiliary agent master batch taking polyethylene as a carrier, and comprises one or more of calcium carbonate, talcum powder, silicon dioxide, glass beads, mica and fluorine-containing master batch. The auxiliary agent is a master batch containing inorganic powder materials, and can improve the shrinkage rate, viscosity and fluidity of each PE material in the outer film, thereby improving the processability of the outer film. Meanwhile, the added auxiliary agent enables the processed and formed outer membrane to have better mechanical property and dimensional stability, ensures that the outer membrane has better uncoiling effect and does not adhere. The auxiliary agent adopts polyethylene as carrier master batch, so that the auxiliary agent has good dispersibility and compatibility in PE, can be uniformly dispersed in PE, and enables the performance of the outer membrane to be uniform and stable.
In the composite PE outer film, the upper surface layer and the lower surface layer both comprise, in parts by weight: 50-80 parts of high-density polyethylene, 10-50 parts of medium-density polyethylene and 0.2-5 parts of auxiliary agent master batch. The upper surface layer and the lower surface layer both contain high-density polyethylene in a large weight part, and the high-density polyethylene can enable the upper surface layer and the lower surface layer to have high stiffness, so that the high requirement on overprinting precision can be met, and the high-temperature resistance stability of the outer membrane can be improved. Meanwhile, the high-density polyethylene is matched with the medium-density polyethylene, so that the outer membrane is not easy to fade after corona treatment while higher stiffness is ensured, and better printing and compounding effects are achieved.
In the composite PE outer film, the middle layer comprises the following components in parts by weight: 40-80 parts of high-density polyethylene, 10-60 parts of linear low-density polyethylene, 10-40 parts of medium-density polyethylene and 0.2-2 parts of fluorine-containing master batch taking polyethylene as a carrier. In the middle layer, the high-density polyethylene and the medium-density polyethylene are added, and the linear low-density polyethylene is also added, so that the mechanical properties such as tensile strength, elongation and the like of the outer film can be improved, the wear resistance of the outer film can be improved, and the outer film can better protect packaged products or articles. The added fluorine-containing master batch can improve the processing performance of the middle layer, the fusant is not easy to crack, and the appearance of the product is more uniform and beautiful. The middle layer enables the outer membrane to have better stiffness and temperature resistance and better mechanical property by adjusting the component proportion of the high-density polyethylene, the linear low-density polyethylene and the medium-density polyethylene.
In some embodiments, the density of the high density polyethylene in the composite PE outer film is 0.955-0.965 g/cm3The density of the medium density polyethylene is 0.931-0.942 g/cm3. High density polyethylene of this density rangeAnd the medium density polyethylene can better improve the high temperature resistance and the stiffness of the outer film, and particularly has better high temperature resistance and stiffness when the two density ranges are matched for use. The temperature resistance and the stiffness of the outer membrane are key indexes influencing the performance of the outer membrane, and the better the stiffness of the outer membrane is, the better the appearance effect is; the better the temperature resistance, the better the outer film can be printed, so that no wrinkles or lines can appear when the pattern is printed on the outer film, and the printing precision of the outer film can be improved. Meanwhile, the outer membrane prepared from the high-density polyethylene and the medium-density polyethylene in the density range has higher heat sealing temperature, the seal-opening temperature of the outer membrane can reach more than 125 ℃, so that the seal-opening temperature difference between the outer membrane and the inner membrane is enlarged, the adjustable heat sealing temperature is wider during heat sealing, the inner membrane can be quickly heat-sealed, the outer membrane can be prevented from obviously shrinking or deforming, a knife is not adhered during the heat sealing process, the heat sealing process can be smoothly carried out, and the dimensional stability of a packaging membrane or a packaging bag after heat sealing can be ensured.
The application also discloses a composite packaging film, composite packaging film includes inner membrance and adventitia, inner membrance and adventitia are the complex film that the PE material prepared obtained. The inner film is a PE composite film with good flexibility, and can be well attached to a product or an article to be packaged when being used as a packaging film; the outer film is the composite PE outer film, and has good stiffness, high temperature resistance and mechanical properties. Therefore, the composite packaging film prepared after the inner film is compounded with the outer film is a composite film taking PE as a base material, and has the advantages of being identical in base material and convenient to recycle. Meanwhile, the outer film is a composite PE outer film, so that the composite PE outer film has good stiffness and high temperature resistance, and double-sided corona can meet the requirements of compounding, printing and other surface treatment, not only is the decorative effect good, but also the product or article to be packaged can be well protected.
Further, in the composite packaging film, the thickness of the inner film is 30-70 μm, and the thickness of the outer film is 40-100 μm. The inner film is attached to a packaged object in the using process, plays roles in heat sealing, blocking and providing certain mechanical property, is thinner than the outer film, provides stiffness and mechanical property for the packaging film, and plays roles in protecting and decorating a product to be packaged, so that the thickness of the product is thicker. However, the thickness of the outer film cannot be too thick, and the outer film has better mechanical properties and better protective effect, but the cost is easily increased, and the decorative effect is reduced. When the thickness of the inner film is 30-70 mu m and the thickness of the outer film is 40-100 mu m, the decorative effect and the protective effect are better.
In the composite packaging film, the seal-peeling temperature difference between the inner film and the outer film is more than 30 ℃. The seal-initiating temperature difference of the inner film and the outer film is a key point for influencing whether the heat seal process of the packaging film can be smoothly carried out and whether the packaging film deforms after heat seal, therefore, the larger the seal-initiating temperature difference is, the better the heat seal can be carried out on the inner film, and on the other hand, the deformation of the outer film can not occur while the heat seal is realized. When the seal-initiating temperature difference between the outer film and the inner film is small, the outer film is also softened and stuck with a knife when the inner film is easily subjected to heat sealing, so that the heat sealing process is difficult to smoothly carry out on one hand, and on the other hand, the packaging film after heat sealing is deformed, so that the decorative effect cannot meet the requirement. The unsealing temperature of the composite PE outer membrane can reach more than 125 ℃, so that the unsealing temperature of the inner membrane can be 80-90 ℃. And because the sealing temperature difference between the two is larger, the heat sealing can be better carried out, and the heat sealing film does not stick to a knife, does not deform or shrink and has better decorative effect integrity.
To further illustrate the present invention, a composite PE outer film and a composite packaging film are provided as follows.
Example 1
The composite PE outer membrane comprises an upper surface layer, a middle layer and a lower surface layer which are sequentially arranged, wherein the upper surface layer, the middle layer and the lower surface layer account for the outer membrane in the following weight ratio: the proportion of the upper surface layer and the lower surface layer is the same, 10 percent of the upper surface layer and the lower surface layer, and 80 percent of the middle layer.
And the components and the mixture ratio of the upper surface layer and the lower surface layer are the same, and the components are as follows according to parts by weight: 50 parts of high-density polyethylene, 50 parts of medium-density polyethylene and 0.2 part of assistant master batch, wherein the assistant master batch is calcium carbonate master batch.
The middle layer comprises the following components in parts by weight: 40 parts of high-density polyethylene, 60 parts of linear low-density polyethylene, 20 parts of medium-density polyethylene and 0.2 part of fluorine-containing master batch taking polyethylene as a carrier.
And in the upper surface layer, the middle layer and the lower surface layer, the density of the high-density polyethylene is 0.955g/cm3The density of the medium density polyethylene is 0.942g/cm3。
The upper surface layer, the middle layer and the lower surface layer are prepared by a co-extrusion film blowing process, a three-layer sandwich structure is formed by compounding in the co-extrusion film blowing process, and in the preparation process, corona treatment is carried out on the upper surface layer and the lower surface layer of the outer film to obtain the composite PE outer film with corona properties on the upper surface and the lower surface.
Meanwhile, compounding the composite PE outer membrane with the inner membrane made of PE to obtain the packaging membrane with the PE material as the base material, wherein the thickness of the composite PE outer membrane is 40 micrometers, the thickness of the inner membrane is 70 micrometers, the heat sealing temperature of the inner membrane is 90 ℃, and the heat sealing temperature of the outer membrane is 125 ℃.
Example 2
The composite PE outer membrane comprises an upper surface layer, a middle layer and a lower surface layer which are sequentially arranged, wherein the upper surface layer, the middle layer and the lower surface layer account for the outer membrane in the following weight ratio: the proportion of the upper surface layer and the lower surface layer is the same, both the upper surface layer and the lower surface layer are 30 percent, and the proportion of the middle layer is 40 percent.
And the components and the mixture ratio of the upper surface layer and the lower surface layer are the same, and the components are as follows according to parts by weight: 80 parts of high-density polyethylene, 10 parts of medium-density polyethylene and 5 parts of auxiliary agent master batches, wherein the auxiliary agent master batches are talcum powder master batches and fluorine-containing master batches.
The middle layer comprises the following components in parts by weight: 80 parts of high-density polyethylene, 10 parts of linear low-density polyethylene, 10 parts of medium-density polyethylene and 2 parts of fluorine-containing master batch taking polyethylene as a carrier.
And in the upper surface layer, the middle layer and the lower surface layer, the density of the high-density polyethylene is 0.965g/cm3The density of the medium density polyethylene is 0.931g/cm3。
The upper surface layer, the middle layer and the lower surface layer are prepared by a co-extrusion film blowing process, a three-layer sandwich structure is formed by compounding in the co-extrusion film blowing process, and in the preparation process, corona treatment is carried out on the upper surface layer and the lower surface layer of the outer film to obtain the composite PE outer film with corona properties on the upper surface and the lower surface.
Meanwhile, compounding the composite PE outer membrane with the inner membrane made of PE to obtain the packaging membrane with the PE material as the base material, wherein the thickness of the composite PE outer membrane is 100 micrometers, the thickness of the inner membrane is 30 micrometers, the heat sealing temperature of the inner membrane is 80 ℃, and the heat sealing temperature of the outer membrane is 130 ℃.
Example 3
The composite PE outer membrane comprises an upper surface layer, a middle layer and a lower surface layer which are sequentially arranged, wherein the upper surface layer, the middle layer and the lower surface layer account for the outer membrane in the following weight ratio: the proportion of the upper surface layer and the lower surface layer is the same, both the upper surface layer and the lower surface layer are 20%, and the proportion of the middle layer is 60%.
And the components and the mixture ratio of the upper surface layer and the lower surface layer are the same, and the components are as follows according to parts by weight: 60 parts of high-density polyethylene, 40 parts of medium-density polyethylene and 2.5 parts of auxiliary agent master batches, wherein the auxiliary agent master batches are silicon dioxide master batches.
The middle layer comprises the following components in parts by weight: 60 parts of high-density polyethylene, 40 parts of linear low-density polyethylene, 40 parts of medium-density polyethylene and 1 part of fluorine-containing master batch taking polyethylene as a carrier.
And in the upper surface layer, the middle layer and the lower surface layer, the density of the high-density polyethylene is 0.960g/cm3The density of the medium-density polyethylene is 0.936g/cm3。
The upper surface layer, the middle layer and the lower surface layer are prepared by a co-extrusion film blowing process, a three-layer sandwich structure is formed by compounding in the co-extrusion film blowing process, and in the preparation process, corona treatment is carried out on the upper surface layer and the lower surface layer of the outer film to obtain the composite PE outer film with corona properties on the upper surface and the lower surface.
Meanwhile, compounding the composite PE outer membrane with the inner membrane made of PE to obtain the packaging membrane with the PE material as the base material, wherein the thickness of the composite PE outer membrane is 80 micrometers, the thickness of the inner membrane is 50 micrometers, the heat sealing temperature of the inner membrane is 85 ℃, and the heat sealing temperature of the outer membrane is 128 ℃.
Example 4
The composite PE outer membrane comprises an upper surface layer, a middle layer and a lower surface layer which are sequentially arranged, wherein the upper surface layer, the middle layer and the lower surface layer account for the outer membrane in the following weight ratio: the proportion of the upper surface layer and the lower surface layer is the same, 15 percent of the upper surface layer and the lower surface layer, and the proportion of the middle layer is 70 percent.
And the components and the mixture ratio of the upper surface layer and the lower surface layer are the same, and the components are as follows according to parts by weight: 70 parts of high-density polyethylene, 30 parts of medium-density polyethylene and 3 parts of auxiliary agent master batches, wherein the auxiliary agent master batches are glass bead master batches and fluorine-containing master batches.
The middle layer comprises the following components in parts by weight: 70 parts of high-density polyethylene, 30 parts of linear low-density polyethylene, 20 parts of medium-density polyethylene and 1.5 parts of fluorine-containing master batch taking polyethylene as a carrier.
And in the upper surface layer, the middle layer and the lower surface layer, the density of the high-density polyethylene is 0.958g/cm3The density of the medium density polyethylene is 0.939g/cm3。
The upper surface layer, the middle layer and the lower surface layer are prepared by a co-extrusion film blowing process, a three-layer sandwich structure is formed by compounding in the co-extrusion film blowing process, and in the preparation process, corona treatment is carried out on the upper surface layer and the lower surface layer of the outer film to obtain the composite PE outer film with corona properties on the upper surface and the lower surface.
Meanwhile, compounding the composite PE outer membrane with the inner membrane made of PE to obtain the packaging membrane with the PE material as the base material, wherein the thickness of the composite PE outer membrane is 70 micrometers, the thickness of the inner membrane is 40 micrometers, the heat sealing temperature of the inner membrane is 82 ℃, and the heat sealing temperature of the outer membrane is 127 ℃.
Example 5
The composite PE outer membrane comprises an upper surface layer, a middle layer and a lower surface layer which are sequentially arranged, wherein the upper surface layer, the middle layer and the lower surface layer account for the outer membrane in the following weight ratio: the proportion of the upper surface layer and the lower surface layer is the same, and both the upper surface layer and the lower surface layer are 25 percent, and the middle layer is 50 percent.
And the components and the mixture ratio of the upper surface layer and the lower surface layer are the same, and the components are as follows according to parts by weight: 70 parts of high-density polyethylene, 40 parts of medium-density polyethylene and 4 parts of auxiliary agent master batches, wherein the auxiliary agent master batches are glass bead master batches and mica master batches.
The middle layer comprises the following components in parts by weight: 50 parts of high-density polyethylene, 50 parts of linear low-density polyethylene, 20 parts of medium-density polyethylene and 1.8 parts of fluorine-containing master batch taking polyethylene as a carrier.
And in the upper surface layer, the middle layer and the lower surface layer, the density of the high-density polyethylene is 0.962g/cm3The density of the medium density polyethylene is 0.935g/cm3。
The upper surface layer, the middle layer and the lower surface layer are prepared by a co-extrusion film blowing process, a three-layer sandwich structure is formed by compounding in the co-extrusion film blowing process, and in the preparation process, corona treatment is carried out on the upper surface layer and the lower surface layer of the outer film to obtain the composite PE outer film with corona properties on the upper surface and the lower surface.
Meanwhile, compounding the composite PE outer membrane with the inner membrane made of the PE material to obtain the packaging membrane with the PE material as the base material, wherein the thickness of the composite PE outer membrane is 80 micrometers, the thickness of the inner membrane is 40 micrometers, the heat sealing temperature of the inner membrane is 85 ℃, and the heat sealing temperature of the outer membrane is 129 ℃.
The composite packaging films prepared in examples 1 to 5 were heat-sealed at 90 ℃ and it was found that no wrinkles were formed on the surface of the packaging film during the heat-sealing process and no knife was stuck.
Comparative example 1
A composite PE outer membrane is formed by compounding three membranes, wherein the three membranes are prepared by taking medium density polyethylene as a PE membrane of a raw material through a coextrusion film blowing process, and corona treatment is carried out on the upper surface and the lower surface of each PE membrane, wherein the density of the medium density polyethylene is the same as that of the medium density polyethylene in example 5. The composite PE outer film was composited with the same inner film as in example 5 to obtain a packaging film in which the thickness of the inner and outer films was the same as in example 5.
Comparative example 2
The composite PE outer film has the same structure and process as those of comparative example 1, is formed by compounding three PE films, and is characterized in that the three PE films are all PE films taking low-density polyethylene as a raw material. The composite PE outer film was composited with the same inner film as in example 5 to obtain a packaging film in which the thickness of the inner and outer films was the same as in example 5.
Comparative example 3
The composite PE outer film has the same structure and process as those of comparative example 1, is formed by compounding three PE films, and is characterized in that the three PE films are all PE films taking linear low-density polyethylene as a raw material. The composite PE outer film was composited with the same inner film as in example 5 to obtain a packaging film in which the thickness of the inner and outer films was the same as in example 5.
Comparative example 4
A composite PE outer film having the same structure and composition as in example 5, except that only one side of the outer film was treated during corona treatment. And simultaneously compounding the composite PE outer film and the inner film to obtain the packaging film, wherein the structure and the thickness of the packaging film are the same as those of the embodiment 5.
The packaging films obtained in comparative examples 1 to 4 were heat-sealed at 90 ℃ and it was found that the packaging films in comparative examples 1 to 3 exhibited a knife sticking phenomenon during heat-sealing and that the heat-sealed packaging films had wrinkles and were significantly shrunk. Comparative example 4 did not show knife sticking and shrinkage.
The above examples 1 to 5 and comparative examples 1 to 4 were subjected to performance tests including tests of slight degree of tensile, elongation at break and modulus of elasticity according to the test for tensile Properties of plastics GB/T1040.3-2006, under the following test conditions: the test specimen width was 15mm, the effective distance was 50mm, the stretching speed was 300mm/min, and the test results are shown in Table 1. Meanwhile, the heat sealing performance test is carried out according to the QB-T2358-1998 plastic film packaging bag heat sealing strength test method, and the test conditions are as follows: 12 μmPE with a double shim, a heat seal pressure of 0.20MPa, a heat seal time of 1.0s, and the test results are shown in Table 2. Also included are stiffness and temperature resistance tests. The stiffness test method is as follows: the size of the sample is 100mm x 100mm, the thickness of the pressing plate is 6mm, the testing speed is 127mm/min, the testing displacement is 25mm, the sample is fixed into an arch bridge shape, the pressing plate is pressed downwards according to the set speed, and the force value tested in the pressing process is stiffness. The test method of the temperature resistance performance comprises the following steps: the same size sample was placed in an oven and incubated at 121 ℃ for 40min, and then the thermal shrinkage was measured. The stiffness and temperature resistance test results are shown in table 3.
Table 1 tensile properties test results
Figure BDA0003280564260000131
TABLE 2 Heat seal test results
Figure BDA0003280564260000132
TABLE 3 Tab.3 Tab.O and temperature resistance test results
Figure BDA0003280564260000141
As can be seen from the test results shown in tables 1 to 3, the tensile properties, heat sealability, and stiffness and temperature resistance of examples 1 to 5 are superior to those of comparative examples 1 to 3, because the composite PE outer films of examples 1 to 5 using high density polyethylene in combination with medium density polyethylene, and linear low density polyethylene added to the middle layer, have better mechanical properties, and the temperature resistance, stiffness and seal-initiation temperature of the packaging films are higher as the content of the high density polyethylene is higher and as the density of the high density polyethylene and the medium density polyethylene is higher. In addition, as the linear polyethylene content in the middle layer is increased, the mechanical property is correspondingly increased, but the temperature resistance is reduced.
As can be seen from example 5 and comparative example 4, the temperature resistance of the packaging film is better after the double-sided corona treatment, and the seal-opening temperature can be increased by 5-10 ℃.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.

Claims (10)

1. The composite PE outer membrane is characterized in that the outer membrane is a composite membrane prepared by a coextrusion film blowing process, and the composite membrane is of a three-layer sandwich structure and comprises an upper surface layer, a lower surface layer and a middle layer, wherein the upper surface layer and the lower surface layer are identical in components and proportion, and the middle layer is clamped between the upper surface layer and the lower surface layer; the upper surface layer, the middle layer and the lower surface layer respectively comprise high-density polyethylene, medium-density polyethylene and an auxiliary agent, and the middle layer also comprises linear low-density polyethylene; the upper surface layer and the lower surface layer are both processed by corona.
2. The composite PE outer membrane of claim 1, wherein the upper and lower skin layers each comprise 10% to 30% by weight of the total weight of the composite membrane, and the intermediate layer comprises 40% to 80% by weight of the total weight of the composite membrane.
3. The composite PE outer membrane of claim 1, wherein the additive is an additive masterbatch with polyethylene as a carrier, and the additive masterbatch comprises one or more of calcium carbonate, talc, silica, glass beads, mica, and fluorine-containing masterbatch.
4. The composite PE outer membrane of claim 1, wherein the upper and lower skin layers comprise, in parts by weight: 50-80 parts of high-density polyethylene, 10-50 parts of medium-density polyethylene and 0.2-5 parts of auxiliary agent master batch.
5. The composite PE outer membrane of claim 1, wherein the intermediate layer comprises, in parts by weight: 40-80 parts of high-density polyethylene, 10-60 parts of linear low-density polyethylene, 10-40 parts of medium-density polyethylene and 0.2-2 parts of fluorine-containing master batch taking polyethylene as a carrier.
6. The composite PE outer membrane of claim 1,the density of the high-density polyethylene is 0.955-0.965 g/cm3。
7. The composite PE outer membrane of claim 1, wherein the medium density polyethylene has a density of 0.931 to 0.942g/cm3。
8. A composite packaging film comprising an inner film and an outer film, both of which are PE films, the outer film being a composite PE outer film according to any one of claims 1 to 7.
9. The composite packaging film of claim 8, wherein the inner film has a thickness of 30 to 70 μm and the outer film has a thickness of 40 to 100 μm.
10. The composite packaging film of claim 8 wherein the inner and outer films have a seal initiation temperature differential of greater than 30 ℃.
CN202111131268.5A 2021-09-26 2021-09-26 Composite PE outer film and composite packaging film Pending CN113978077A (en)

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CN109823693A (en) * 2018-12-26 2019-05-31 江阴申隆包装材料有限公司 A kind of foaming composite sheet and its preparation process
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CN207120546U (en) * 2017-08-25 2018-03-20 河南金佰瑞包装材料有限公司 A kind of low-temperature heat-sealing high temperature resistant sterilizes the compound stretched films of PVDC
CN109823693A (en) * 2018-12-26 2019-05-31 江阴申隆包装材料有限公司 A kind of foaming composite sheet and its preparation process
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