Multilayer stretched film
Through the multi-layer tensile film structure, including the LDPE and POE core layer and through-hole design, the problems of difficult product damage confirmation, insufficient tensile strength and poor breathability in the existing packaging methods are solved, and the packaging effect with high strength and excellent breathability is achieved.
Patent Information
- Application Number
- CN202380087977.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-01-02
- Filing Date
- 2023-03-02
- Publication Date
- 2025-08-12
AI Technical Summary
Existing packaging methods such as box packaging is difficult to confirm whether the product is damaged, and film packaging has problems such as insufficient tensile strength and elongation, long fixation time of the constituent layer and poor breathability.
A multi-layer stretched film structure is adopted, including the first and second layers of low-density polyethylene (LDPE), and a core layer made of polyolefin elastomer (POE). Through holes are provided between the layers and erucic acid amide is added to improve the fixation speed and surface gloss.
It is possible to confirm product damage in the packaging state, which improves the tensile strength and elongation of the film, shortens the layer fixation time, and improves breathability.
Smart Images
Figure CN120476045A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to a stretch film composed of a plurality of layers. Background Art
[0002] Traditionally, boxes have been a common method of packaging products. Box packaging offers the advantages of easy repackaging and protecting the product from external impacts after packaging. However, box packaging has the disadvantage of making it difficult to verify damage from the outside. Furthermore, box packaging is bulky and heavy, resulting in a significant amount of waste after product delivery.
[0003] In addition to the above-mentioned packaging, there is a conventional product packaging method that uses film to package products. The packaging method also known as the visual packaging process includes a method of using stretch film or stretch hood film to package products.
[0004] Wrapping products with transparent or translucent stretch film or stretch hood film has the advantages of being able to check whether the packaged product is damaged, and the volume of the packaging material removed is small, resulting in lower carbon emissions when discarded.
[0005] The tensile strength, elongation, tear strength of the film and the time required for production of the film packaging are the main design factors. Summary of the Invention
[0006] Problems to be solved by the invention
[0007] The problem to be solved by the present application is to provide a multi-layer stretch film that can confirm from the outside whether a product in a packaged state is damaged.
[0008] Another problem to be solved by the present application is to provide a multilayer stretched film having excellent tensile strength in the longitudinal direction and the width direction of the film.
[0009] Another problem to be solved by the present application is to provide a multilayer stretched film having excellent elongation in the longitudinal direction and excellent elongation in the width direction.
[0010] Another problem to be solved by the present application is to provide a multilayer stretched film capable of shortening the time required for fixing of a plurality of layers constituting the film.
[0011] In addition, the problem to be solved by the present application is to provide a multi-layer stretched film having excellent air permeability.
[0012] Technical solutions to the problem
[0013] The present application provides a multilayer stretch film, which includes: a first layer and a second layer made of low-density polyethylene (LDPE); and a core layer made of polyolefin elastomer (POE) and located between the first layer and the second layer.
[0014] The core layer can use 100% of a density of 0.85 to 0.910 g / cm 3 Made of polyolefin elastomer (POE).
[0015] The weight ratio of the first layer, the core layer, and the second layer may be set to 1:3:1.
[0016] The thickness ratio of the first layer, the core layer, and the second layer may be set to 1:2:1.
[0017] The first layer and the second layer can each use 100% of a density of 0.910 to 0.920 g / cm 3 Made of low-density polyethylene (LDPE).
[0018] The first layer may have a density of 0.910 to 0.920 g / cm 3 Metallocene linear low-density polyethylene (mLLDPE) with a density of 0.910 to 0.920 g / cm 3 Low density polyethylene (LDPE) and density of 0.85 to 0.910 g / cm 3 It is made from a mixture of polyolefin elastomers (POE).
[0019] The weight of the metallocene linear low-density polyethylene (mLLDPE) can be set to 40 to 50% of the weight of the first layer, the weight of the low-density polyethylene (LDPE) can be set to 10 to 30% of the weight of the first layer, and the weight of the polyolefin elastomer (POE) can be set to 10 to 30% of the weight of the first layer.
[0020] The second layer may have a density of 0.910 to 0.920 g / cm 3 Metallocene linear low-density polyethylene (mLLDPE) with a density of 0.910 to 0.920 g / cm 3 Low density polyethylene (LDPE) and density 0.85 to 0.910 g / cm 3 It is made from a mixture of polyolefin elastomer (POE).
[0021] The weight of the metallocene linear low-density polyethylene (mLLDPE) can be set to 40 to 50% of the weight of the second layer, the weight of the low-density polyethylene (LDPE) can be set to 10 to 30% of the weight of the second layer, and the weight of the polyolefin elastomer (POE) can be set to 10 to 30% of the weight of the second layer.
[0022] The first layer and the second layer can be made of a mixture of erucamide and low-density polyethylene (LDPE) in an amount of 2 to 4% by weight of each layer.
[0023] The concentration of erucamide may be set to a concentration of 300 to 600 ppm.
[0024] The multi-layer stretched film may include through-layer holes penetrating the first layer, the core layer, and the second layer.
[0025] The through-layer holes may be provided as a plurality of holes, and the plurality of holes may be provided along the width direction of the film or the length direction of the film.
[0026] In addition, the present application provides a multilayer stretch film, which includes: a first layer and a second layer; and a core layer, which is made of polyolefin elastomer (POE) and is located between the first layer and the second layer. The first layer and the second layer can be made of a mixture of low-density polyethylene (LDPE) and erucamide (Erucamide) equivalent to 2 to 4% of the layer weight, respectively.
[0027] The concentration of erucamide may be set to a concentration of 300 to 600 ppm.
[0028] The core layer may use 100% of a density of 0.85 to 0.910 g / cm 3 Made of polyolefin elastomer (POE).
[0029] The first layer may have a density of 0.910 to 0.920 g / cm 3 Metallocene linear low-density polyethylene (mLLDPE) with a density of 0.910 to 0.920 g / cm 3 Low density polyethylene (LDPE) and density of 0.85 to 0.910 g / cm 3 It is made from a mixture of polyolefin elastomer (POE).
[0030] The weight of the metallocene linear low-density polyethylene (mLLDPE) can be set to 40 to 50% of the weight of the first layer, the weight of the low-density polyethylene (LDPE) can be set to 10 to 30% of the weight of the first layer, and the weight of the polyolefin elastomer (POE) can be set to 10 to 30% of the weight of the first layer.
[0031] The second layer may have a density of 0.910 to 0.920 g / cm 3 Metallocene linear low-density polyethylene (mLLDPE) with a density of 0.910 to 0.920 g / cm 3 Low density polyethylene (LDPE) and density of 0.85 to 0.910 g / cm 3 It is made from a mixture of polyolefin elastomer (POE).
[0032] The weight of the metallocene linear low-density polyethylene (mLLDPE) can be set to 40 to 50% of the weight of the second layer, the weight of the low-density polyethylene (LDPE) can be set to 10 to 30% of the weight of the second layer, and the weight of the polyolefin elastomer (POE) can be set to 10 to 30% of the weight of the second layer.
[0033] The weight ratio of the first layer, the core layer, and the second layer may be set to 1:3:1.
[0034] The thickness ratio of the first layer, the core layer, and the second layer may be set to 1:2:1.
[0035] In addition, the present application provides a multilayer stretch film, which includes: a first layer and a second layer made of low-density polyethylene (LDPE); a core layer made of polyolefin elastomer (POE) and located between the first layer and the second layer; and a through-layer hole that penetrates the first layer, the core layer and the second layer.
[0036] The through-layer holes may be provided as a plurality of holes provided along the width direction of the film or the length direction of the film.
[0037] The core film can use 100% density of 0.85 to 0.910 g / cm 3 Made of polyolefin elastomer (POE).
[0038] The weight ratio of the first layer, the core layer, and the second layer may be set to 1:3:1.
[0039] The thickness ratio of the first layer, the core layer, and the second layer may be set to 1:2:1.
[0040] The first layer and the second layer may each be made of 100% of a material having a density of 0.910 to 0.920 g / cm 3 Made of low-density polyethylene (LDPE).
[0041] The first layer may have a density of 0.910 to 0.920 g / cm 3 Metallocene linear low-density polyethylene (mLLDPE) with a density of 0.910 to 0.920 g / cm 3 Low density polyethylene (LDPE), density 0.85 to 0.910 g / cm 3 The invention is made from a mixture of polyolefin elastomer (POE) and erucamide (Erucamide) with a concentration of 300 to 600 ppm.
[0042] The weight of the metallocene linear low-density polyethylene (mLLDPE) can be set to 40 to 50% of the weight of the first layer, the weight of the low-density polyethylene (LDPE) can be set to 10 to 30% of the weight of the first layer, the weight of the polyolefin elastomer (POE) can be set to 10 to 30% of the weight of the first layer, and the weight of the erucamide can be set to 2 to 4% of the weight of the first layer.
[0043] The second layer can be set to have a density of 0.910 to 0.920 g / cm 3 Metallocene linear low-density polyethylene (mLLDPE) with a density of 0.910 to 0.920 g / cm 3 Low density polyethylene (LDPE), density 0.85 to 0.910 g / cm 3 The invention is made from a mixture of polyolefin elastomer (POE) and erucamide (Erucamide) with a concentration of 300 to 600 ppm.
[0044] The weight of the metallocene linear low-density polyethylene (mLLDPE) can be set to 40 to 50% of the weight of the second layer, the weight of the low-density polyethylene (LDPE) can be set to 10 to 30% of the weight of the second layer, the weight of the polyolefin elastomer (POE) can be set to 10 to 30% of the weight of the second layer, and the weight of the erucamide can be set to 2 to 4% of the weight of the second layer.
[0045] Effects of the Invention
[0046] The present application provides a multi-layer stretch film capable of confirming whether a product is damaged in a packaged state.
[0047] The present application also provides a multilayer stretched film having excellent tensile strength in the longitudinal direction and the width direction of the film.
[0048] The present application also provides a multilayer stretched film having excellent elongation in the longitudinal direction and elongation in the width direction of the film.
[0049] Furthermore, the present application provides a multilayer stretched film capable of shortening the time required for the fixing of a plurality of layers constituting the film.
[0050] In addition, the present application provides a multi-layer stretched film having excellent air permeability. BRIEF DESCRIPTION OF THE DRAWINGS
[0051] Figure 1 and Figure 2 This is a diagram showing an example of a process of packaging a product using a stretch film and a packaged product.
[0052] Figure 3 This is a diagram showing an example of a multilayer stretched film.
[0053] Figure 4 This is a table comparing the properties of conventional films and the multilayer stretched film of the present invention.
[0054] Figure 5 and Figure 6 This is a diagram showing an example of a multilayer stretched film provided with through-layer holes. DETAILED DESCRIPTION
[0055] Hereinafter, preferred embodiments of the multilayer stretched film will be described in detail with reference to the accompanying drawings.
[0056] Methods of packaging products using stretch film include: using stretch hood film to cover the product from the top to the bottom; wrapping, which uses stretch film to wrap a part or the entire surface of the product; and shrink wrapping, which uses stretch film to wrap the product and heat it to adjust the shrinkage of the film.
[0057] Figure 1 is a diagram illustrating a process of packaging a product using a stretch hood film which is a type of multi-layer stretch film.
[0058] like Figure 1 As shown in (a), if the product 1 moves along the conveyor 2 to the packaging device 3, the packaging device 3 calculates the required amount of film 100. Figure 1 As shown in (b), the packaging device 3 cuts a required amount of film 100 and joins the cut surfaces at the same time. The film 100 joined with the cut surfaces becomes a cover-shaped film 4 with its upper surface closed.
[0059] like Figure 1 As shown in (c), the arm 31 provided in the packaging device 3 pulls the periphery of the cover-shaped film 4 to expand the diameter, and then covers the cover-shaped film 4 from the upper part to the lower part of the product 1. Figure 1 As shown in (d), if the arm 31 is removed, the cover-shaped film 4 will shrink to protect the shape and appearance of the product 1.
[0060] like Figure 2 As shown, if the product 1 is packaged using a film 100 made of a transparent or translucent material, it is possible to check whether the product 1 is damaged without removing the package.
[0061] Figure 3 1 is a diagram showing an example of a stretch film used for the above-mentioned packaging, Figure 3 The stretch film is characterized in that the stretch film is a multilayer stretch film 200 (multilayer stretch film) formed by combining a plurality of layers to form a single film.
[0062] The multilayer stretch film 200 can be configured to include: a first layer 210 made of low-density polyethylene (LDPE); a second layer 220 made of low-density polyethylene (LDPE); and a core layer 230 made of polyolefin elastomer (POE) and located between the first layer 210 and the second layer 220.
[0063] Among the existing multilayer stretch films, there is a film composed of a first layer, a second layer and a core layer, wherein the first layer and the second layer are made of low-density polyethylene, and the core layer is located between the first layer and the second layer and is made of ethylene vinyl acetate (EVA, Ethylene Vinyl Acetate, ethylene-vinyl acetate copolymer).
[0064] When the core layer is compared with a multilayer stretched film made of ethylene vinyl acetate (EVA), the multilayer stretched film 200 has excellent tensile strength in the length and width directions of the film and elongation in the length and width directions of the film. The multilayer stretched film 200 has the core layer 230 made of polyolefin elastomer (POE).
[0065] The core layer 230 may use 100% of a density of 0.85 to 0.910 g / cm 3 The first layer 210 and the second layer 220 can be made of polyolefin elastomer (POE) with a density of 0.910 to 0.920 g / cm 3Made of low-density polyethylene (LDPE).
[0066] Different from the above, the core layer 230 may use 100% of a density of 0.85 to 0.910 g / cm 3 The first layer 210 may be made of a polyolefin elastomer (POE) having a density of 0.910 to 0.920 g / cm 3 Metallocene linear low-density polyethylene (mLLDPE) with a density of 0.910 to 0.920 g / cm 3 Low density polyethylene (LDPE) and density of 0.85 to 0.910 g / cm 3 The second layer 220 may be made of a mixture of polyolefin elastomer (POE) with a density of 0.910 to 0.920 g / cm 3 Metallocene linear low-density polyethylene (mLLDPE) with a density of 0.910 to 0.920 g / cm 3 Low density polyethylene (LDPE) and density of 0.85 to 0.910 g / cm 3 It is made from a mixture of polyolefin elastomer (POE).
[0067] When making the first layer 210, the weight of the metallocene linear low-density polyethylene (mLLDPE) can be set to 40 to 50% of the weight of the first layer, the weight of the low-density polyethylene (LDPE) can be set to 10 to 30% of the weight of the first layer, and the weight of the polyolefin elastomer (POE) can be set to 10 to 30% of the weight of the first layer.
[0068] When making the second layer 220, the weight of the metallocene linear low-density polyethylene (mLLDPE) can be set to 40 to 50% of the weight of the second layer, the weight of the low-density polyethylene (LDPE) can be set to 10 to 30% of the weight of the second layer, and the weight of the polyolefin elastomer (POE) can be set to 10 to 30% of the weight of the second layer.
[0069] On the other hand, in order to save time for combining the first layer 210 , the core layer 230 and the second layer 220 to form a multilayer stretched film 200 (shortening the layer fixing time), additives may be added to the multilayer stretched film 200 .
[0070] That is, the first layer 210 may be made of a mixture of the low-density polyethylene (LDPE) and erucamide (Cas No. 112-84-5), and the second layer 220 may be made of a mixture of the low-density polyethylene (LDPE) and erucamide.
[0071] The amount of erucamide added to the first layer 210 can be set to 2 to 4% of the weight of the first layer, and the amount of erucamide added to the second layer 220 can be set to 2 to 4% of the weight of the second layer. Furthermore, the concentrations of erucamide used in the first layer 210 and the second layer 220 are preferably set to 300 to 600 ppm, respectively.
[0072] That is, the first layer 210 may have a density of 0.910 to 0.920 g / cm 3 Metallocene linear low-density polyethylene (mLLDPE) with a density of 0.910 to 0.920 g / cm 3 Low density polyethylene (LDPE), density 0.85 to 0.910 g / cm 3 The first layer may be made of a mixture of a polyolefin elastomer (POE) and erucamide at a concentration of 300 to 600 ppm. In this case, the weight of the metallocene linear low-density polyethylene (mLLDPE) can be set to 40 to 50% of the weight of the first layer, the weight of the low-density polyethylene (LDPE) can be set to 10 to 30% of the weight of the first layer, the weight of the polyolefin elastomer (POE) can be set to 10 to 30% of the weight of the first layer, and the weight of the erucamide can be set to 2 to 4% of the weight of the first layer.
[0073] The second layer 220 may have a density of 0.910 to 0.920 g / cm 3 Metallocene linear low-density polyethylene (mLLDPE) with a density of 0.910 to 0.920 g / cm 3 Low density polyethylene (LDPE), density 0.85 to 0.910 g / cm 3 The second layer may be made of a mixture of a polyolefin elastomer (POE) and erucamide at a concentration of 300 to 600 ppm. In this case, the weight of the metallocene linear low-density polyethylene (mLLDPE) can be set to 40 to 50% of the weight of the second layer, the weight of the low-density polyethylene (LDPE) can be set to 10 to 30% of the weight of the second layer, the weight of the polyolefin elastomer (POE) can be set to 10 to 30% of the weight of the second layer, and the weight of the erucamide can be set to 2 to 4% of the weight of the second layer.
[0074] If erucamide is used in the preparation of the first layer 210 and the second layer 220 , not only can the fixing time of the layers 210 , 220 and 230 be shortened, but also the surface of the film can be made smooth and glossy.
[0075] Furthermore, when the weight ratio of the first layer 210, the core layer 230, and the second layer 220 is set to 1:3:1, it is confirmed that the tensile strength, elongation, and tear strength are improved. In addition, when the thickness ratio of the first layer 210, the core layer 230, and the second layer 220 is set to 1:2:1, it is confirmed that the tensile strength, elongation, and tear strength are improved.
[0076] Figure 4 This table compares the properties of the multilayer stretched film 200 in which the core layer 230 is made of polyolefin elastomer (POE) and the properties of the multilayer stretched film in which the core layer is made of ethylene vinyl acetate (EVA).
[0077] The multilayer stretched film 200 using polyolefin elastomer (POE) to make the core layer 230 is confirmed to have excellent tensile strength in the longitudinal direction of the film, tensile strength in the width direction of the film, elongation in the longitudinal direction of the film, and elongation in the width direction of the film compared to the existing multilayer stretched film, and the tear strength is confirmed to be almost the same.
[0078] On the other hand, the multilayer stretch film 200 using a polyolefin elastomer core layer has a lower static friction coefficient than existing multilayer stretch films. Since a lower static friction coefficient is more advantageous for packaging products, the multilayer stretch film 200 using a polyolefin elastomer core layer 230 has an advantageous effect on product packaging compared to existing multilayer stretch films.
[0079] When the multilayer stretch film 200 having the above structure is used to package a product, air may condense inside the product and damage the product. To solve this problem, the multilayer stretch film 200 may be further provided with a plurality of through-layer holes 240 .
[0080] like Figure 5 and Figure 6 As shown, the through-layer holes 240 need to be arranged to pass through the first layer 210 , the core layer 230 and the second layer 220 . The through-layer holes 240 can be arranged as a plurality of holes separated along the width direction of the multilayer stretched film 200 or the length direction of the multilayer stretched film 200 .
[0081] The spacing between the through-holes 240 (the spacing in the width direction of the film or the spacing in the length direction of the film) can be set to various values. For example, the spacing between the through-holes 240 in the width direction of the multilayer stretched film can be set to 150 mm, and the spacing between the through-holes 240 in the length direction of the multilayer stretched film can be set to 35 to 40 mm.
[0082] Since the above-mentioned multilayer stretched film is a film for explaining an example of the present application, the scope of claims of the present application is not limited to the above-mentioned structure and control method.
Claims
1. A multilayer stretched film, characterized in that include: The first and second layers are made of low-density polyethylene (LDPE); as well as The core layer is made of polyolefin elastomer POE and is located between the first layer and the second layer.
2. The multilayer stretched film according to claim 1, wherein The core layer uses 100% of a density of 0.85 to 0.910 g / cm 3 Made of polyolefin elastomer POE.
3. The multilayer stretched film according to claim 2, wherein The weight ratio of the first layer, the core layer, and the second layer is set to 1:3:
1.
4. The multilayer stretched film according to claim 2, wherein The thickness ratio of the first layer, the core layer, and the second layer is set to 1:2:
1.
5. The multilayer stretched film according to claim 2, wherein The first layer and the second layer are respectively made of 100% of a material having a density of 0.910 to 0.920 g / cm 3 Made of low-density polyethylene LDPE.
6. The multilayer stretched film according to claim 2, wherein The first layer has a density of 0.910 to 0.920 g / cm 3 Metallocene linear low-density polyethylene mLLDPE, density 0.910 to 0.920 g / cm 3 Low density polyethylene LDPE and density of 0.85 to 0.910 g / cm 3 Made from a mixture of polyolefin elastomer POE.
7. The multilayer stretched film according to claim 6, wherein The weight of the metallocene linear low-density polyethylene mLLDPE is set to 40 to 50% of the weight of the first layer, The weight of the low-density polyethylene (LDPE) is set to 10 to 30% of the weight of the first layer. The weight of the polyolefin elastomer POE is set to 10 to 30% of the weight of the first layer.
8. The multilayer stretched film according to claim 2, wherein The second layer has a density of 0.910 to 0.920 g / cm 3 Metallocene linear low-density polyethylene mLLDPE, density 0.910 to 0.920 g / cm 3 Low density polyethylene LDPE and density of 0.85 to 0.910 g / cm 3 Made from a mixture of polyolefin elastomer POE.
9. The multilayer stretched film according to claim 8, wherein The weight of the metallocene linear low-density polyethylene mLLDPE is set to 40 to 50% of the weight of the second layer, The weight of the low-density polyethylene LDPE is set to 10 to 30% of the weight of the second layer, The weight of the polyolefin elastomer POE is set to 10 to 30% of the weight of the second layer.
10. The multilayer stretched film according to claim 1, wherein The first layer and the second layer are respectively made of a mixture of erucamide and low-density polyethylene (LDPE) in an amount of 2 to 4% by weight of the layer.
11. The multilayer stretched film according to claim 10, wherein The concentration of erucamide is set to a concentration of 300 to 600 ppm.
12. The multilayer stretched film according to claim 1, wherein It includes a through-layer hole that passes through the first layer, the core layer, and the second layer.
13. The multilayer stretched film according to claim 12, wherein The through-layer holes are provided as a plurality of holes, and the plurality of holes are provided along the width direction of the film or the length direction of the film.