Polypropylene film for in-mold label

Abstract

The utility model provides a polypropylene film for an in-mold label, which belongs to the technical field of in-mold labels and comprises a supporting layer and a polypropylene film, and a plurality of embedding holes are uniformly distributed on the upper surface of the supporting layer; according to the utility model, the supporting layer and the polypropylene film are arranged, in the manufacturing process, the supporting layer is made of the silica gel material which is not easy to shrink and curl after being heated, the embedding holes are formed in the upper surface of the supporting layer, the hot-melt polypropylene is smeared on the upper surface of the supporting layer to form the film, and the embedding holes are filled with the hot-melt polypropylene; after the polypropylene is cooled, a mark needing to be printed is printed on the upper surface of the polypropylene film for manufacturing, the supporting layer is made of silica gel materials and has good heat shrinkage resistance and a good heat curling prevention effect, the polypropylene can increase the adhesive force between the polypropylene and the supporting layer, and when the manufactured label is used in a mold, the adhesive force between the polypropylene and the supporting layer can be increased. The condition that the polypropylene film is curled and shrunk due to overheating is avoided, and the normal identification of the mark on the label is ensured.

Description

Technical Field

[0001] This utility model relates to the field of in-mold labeling technology, and in particular to a polypropylene film for in-mold labeling. Background Technology

[0002] In-mold labeling is a labeling technology that directly injects labels into the inside of plastic products. This technology not only enhances the appearance of products but also provides durable identification information while reducing the risk of labels falling off or being damaged.

[0003] Polypropylene film layers have good resistance to a variety of chemicals, are not easily corroded by acids and alkalis, and have high tensile and tear strength, and can withstand the pressure during injection molding. As a commonly used in-mold label material, polypropylene film layers have many advantages, making them the preferred material in this field.

[0004] However, existing polypropylene film labels have poor heat shrinkage resistance. When polypropylene film layers are made into in-mold labels, the heat generated during the injection molding process of plastic products can easily cause the labels to shrink and curl, affecting the normal marking of the labels. Therefore, a polypropylene film for in-mold labels is designed to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to solve the problems existing in the above-mentioned background art by proposing a polypropylene film for in-mold labeling.

[0006] The technical problem to be solved by this utility model is to provide a polypropylene film for in-mold labeling, which solves the problem that polypropylene film layer labels have poor heat shrinkage performance and are prone to curling when heated, thus affecting the normal marking of the label when they are made into in-mold labels.

[0007] This utility model provides a polypropylene film for in-mold labeling, including a support layer and a polypropylene film layer. The upper surface of the support layer has a plurality of embedding holes evenly distributed thereon, and the polypropylene film layer is attached to the upper surface of the support layer by hot-melt method.

[0008] The polypropylene film layer includes, from bottom to top, a hot melt layer, a printing layer, a high-temperature resistant layer, and a wear-resistant layer. The printing layer is fixedly disposed on the upper surface of the hot melt layer, the high-temperature resistant layer is fixedly disposed on the upper surface of the printing layer, and the wear-resistant layer is fixedly disposed on the upper surface of the high-temperature resistant layer.

[0009] Preferably, the support layer is made of silicone material that is not easily shrunk or curled when heated.

[0010] Preferably, multiple embedded grooves are formed at each of the four corners of the upper surface of the support layer.

[0011] Preferably, the embedding groove is rectangular and is evenly distributed at equal intervals at the four corners of the support layer.

[0012] Preferably, a spherical groove is formed at the bottom of the embedding hole.

[0013] Preferably, the diameter of the spherical groove is larger than the diameter of the embedding hole.

[0014] Preferably, a reinforcing frame is fixedly provided around the sides of the polypropylene film layer.

[0015] Preferably, the reinforcing frame is made of silicone and is semi-cylindrical.

[0016] Preferably, the upper surface of the hot melt layer is fixedly provided with multiple corrugated strips.

[0017] Compared with the prior art, this utility model has at least the following beneficial effects:

[0018] 1. This utility model incorporates a support layer and a polypropylene film layer. During manufacturing, the support layer is made of silicone material that is resistant to heat shrinkage and curling. Multiple embedding holes are formed on the upper surface of the support layer. Hot-melt polypropylene is applied to the upper surface of the support layer to form a film, filling the embedding holes. After the polypropylene cools, the desired label is printed on the upper surface of the polypropylene film layer. The support layer, made of silicone, has excellent heat shrinkage resistance and prevents heat curling. Furthermore, the polypropylene increases the adhesion between the polypropylene and the support layer. When the finished label is used in the mold, the polypropylene film layer will not curl or shrink due to overheating, ensuring normal identification of the label.

[0019] 2. This utility model is provided with a hot melt layer, a printing layer, a high temperature resistant layer and a wear-resistant layer. The hot melt layer can ensure the contact between the film and the support layer and ensure the stability of the polypropylene film layer. The printing layer facilitates the printing of in-mold labels. The high temperature resistant layer can ensure the high temperature resistance of the polypropylene film layer. The wear-resistant layer can increase the wear resistance of the polypropylene film layer.

[0020] 3. This utility model has embedded grooves. Embedded grooves are opened at the four corners of the upper surface of the support layer. During the in-mold label production process, the hot-melt polypropylene film layer will fill the embedded grooves, increasing the contact area between the four corners of the support layer and the polypropylene, increasing the adhesion, and preventing the polypropylene at the four corners of the support layer from curling due to heat.

[0021] 4. This utility model has a spherical groove. The hot-melt polypropylene enters the spherical groove through the embedding hole and fills the spherical groove. After the polypropylene cools, the polypropylene in the embedding hole and the spherical groove are integrated, which can prevent the polypropylene from falling out of the spherical groove and the embedding hole, and further ensure the stability of the polypropylene film layer adhering to the upper surface of the support layer.

[0022] 5. This utility model features a reinforcing frame that protects the polypropylene film layer from stretching or shrinking when heated, thus ensuring the stability of the polypropylene film layer when heated.

[0023] 6. By setting multiple corrugated strips, this utility model increases the contact area between the printed layer and the hot melt layer when the printed layer is attached to the upper surface of the hot melt layer, thereby increasing stability. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0025] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model.

[0026] Figure 2 This is a schematic diagram of the three-dimensional structure of the support layer of this utility model.

[0027] Figure 3 This utility model Figure 2 Enlarged structural diagram at point A.

[0028] Figure 4 This is a cross-sectional schematic diagram of the overall structure of this utility model.

[0029] Figure 5 This utility model Figure 1 Enlarged structural diagram at point B.

[0030] Figure 6 This is a schematic diagram showing the three-dimensional structure of the polypropylene film layer of this utility model.

[0031] [Figure Labels]

[0032] 1. Supporting layer; 101. Embedded hole; 102. Embedded groove; 103. Spherical groove; 2. Polypropylene film layer; 201. Hot melt layer; 2011. Corrugated strip; 202. Printed layer; 203. High temperature resistant layer; 204. Wear resistant layer; 3. Reinforcing frame. Detailed Implementation

[0033] Example:

[0034] like Figures 1-6 As shown, an embodiment of the present invention provides a polypropylene film for in-mold labeling, including a support layer 1 and a polypropylene film layer 2. The upper surface of the support layer 1 has a plurality of embedding holes 101 evenly distributed, and the polypropylene film layer 2 is attached to the upper surface of the support layer 1 by hot-melt method.

[0035] The polypropylene film layer 2 includes a hot melt layer 201, a printing layer 202, a high temperature resistant layer 203 and a wear-resistant layer 204 arranged sequentially from bottom to top. The printing layer 202 is fixedly disposed on the upper surface of the hot melt layer 201, the high temperature resistant layer 203 is fixedly disposed on the upper surface of the printing layer 202, and the wear-resistant layer 204 is fixedly disposed on the upper surface of the high temperature resistant layer 203.

[0036] In this embodiment, the support layer 1 is made of silicone material that is not easily shrunk or curled when heated.

[0037] By setting a support layer 1 and a polypropylene film layer 2, during the manufacturing process, the support layer 1 is made of silicone material that is not easily shrunk or curled when heated, and multiple embedding holes 101 are opened on the upper surface of the support layer 1. Hot-melt polypropylene is applied to the upper surface of the support layer 1 to form a hot-melt layer 101. Then, a printing layer 202 is made in sequence, and the inner label is printed on the printing layer 202. Then, a high-temperature resistant layer 203 and a wear-resistant layer 204 are made. The hot-melt polypropylene fills the embedding holes 101. After the polypropylene cools, the label to be printed is printed on the upper surface of the polypropylene film layer 2. The support layer 1 is made of silicone material, which has good heat shrinkage resistance and heat curl prevention effect. In addition, polypropylene can increase the adhesion between polypropylene and support layer 1. When the finished label is used in the mold, the polypropylene film layer 2 will not curl or shrink due to overheating, ensuring that the label can be read normally.

[0038] By providing a hot-melt layer 201, a printing layer 202, a high-temperature resistant layer 203, and a wear-resistant layer 204, the hot-melt layer 201 ensures contact between the film and the support layer 1, guaranteeing the stability of the polypropylene film layer 2. The printing layer 202 facilitates the printing of in-mold labels. The high-temperature resistant layer 203 ensures the high-temperature resistance of the polypropylene film layer 2. The wear-resistant layer 204 increases the wear resistance of the polypropylene film layer 2.

[0039] In this embodiment, multiple embedding grooves 102 are provided at the four corners of the upper surface of the support layer 1.

[0040] In this embodiment, the embedding groove 102 is rectangular and is evenly distributed at the four corners of the support layer 1.

[0041] By providing the embedding grooves 102, embedding grooves 102 are opened at the four corners of the upper surface of the support layer 1. During the in-mold label production process, the hot-melt polypropylene film layer 2 will fill the embedding grooves 102, increasing the contact area between the four corners of the support layer 1 and the polypropylene, increasing the adhesion, and preventing the polypropylene at the four corners of the support layer 1 from curling due to heat.

[0042] In this embodiment, a spherical groove 103 is provided at the bottom of the embedding hole 101.

[0043] In this embodiment, the diameter of the spherical groove 103 is larger than the diameter of the embedding hole 101.

[0044] By providing a spherical groove, hot-melt polypropylene enters the spherical groove 103 through the embedding hole 101 and fills the spherical groove 103. After the polypropylene cools, the polypropylene in the embedding hole 101 and the spherical groove 103 are integrated, which can prevent the polypropylene from coming out of the spherical groove 103 and the embedding hole 101, and further ensure the stability of the polypropylene film layer 2 attached to the upper surface of the support layer 1.

[0045] In this embodiment, a reinforcing frame 3 is fixedly provided around the sides of the polypropylene film layer 2.

[0046] In this embodiment, the reinforcing frame 3 is made of silicone and is semi-cylindrical. The reinforcing frame 3 is not easily shrunk or deformed when heated. The reinforcing frame 3 can protect the polypropylene film layer 2 from deformation when heated.

[0047] By providing a reinforcing frame 3, the polypropylene film layer 2 can be protected around its perimeter, preventing it from stretching or shrinking when heated, thus further ensuring the stability of the polypropylene film layer 2 when heated.

[0048] In this embodiment, multiple corrugated strips 2011 are fixedly disposed on the upper surface of the hot melt layer 201.

[0049] By setting multiple corrugated strips 2011, the contact area between the printed layer 202 and the hot melt layer 201 can be increased when the printed layer 202 is attached to the upper surface of the hot melt layer 201, thereby increasing stability.

[0050] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of this utility model, and these should also be considered within the scope of protection of this utility model. These will not affect the implementation effect of this utility model or the practicality of the patent.

Claims

1. A polypropylene film for use in an in-mold label, characterized by: Including support layer (1) and polypropylene film layer (2), the upper surface of the support layer (1) is uniformly distributed with a plurality of embedded holes (101), and the polypropylene film layer (2) is attached to the upper surface of the support layer (1) in a hot melt manner; The polypropylene film layer (2) comprises a hot melt layer (201), a printing layer (202), a high temperature resistant layer (203) and a wear resistant layer (204) arranged in turn from bottom to top, the upper surface of the hot melt layer (201) is fixedly provided with the printing layer (202), the upper surface of the printing layer (202) is fixedly provided with the high temperature resistant layer (203), and the upper surface of the high temperature resistant layer (203) is fixedly provided with the wear resistant layer (204).

2. The polypropylene film for an in-mold label according to claim 1, characterized by: The support layer (1) is made of silica gel material which is not easy to shrink and curl when heated.

3. The polypropylene film for an in-mold label according to claim 2, characterized by: The upper surface of the support layer (1) is provided with a plurality of embedded grooves (102) at four corners.

4. The polypropylene film for an in-mold label according to claim 3, characterized by: The embedded grooves (102) are rectangular and evenly distributed at the four corners of the support layer (1).

5. The polypropylene film for an in-mold label according to claim 1, characterized by: The bottom of the embedded hole (101) is provided with a spherical groove (103).

6. The polypropylene film for an in-mold label according to claim 5, characterized by: The diameter of the spherical groove (103) is greater than the diameter of the embedded hole (101).

7. The polypropylene film for an in-mold label according to claim 6, characterized by: The side of the polypropylene film layer (2) is fixedly provided with a reinforcing frame (3).

8. The polypropylene film for an in-mold label according to claim 7, characterized by: The reinforcing frame (3) is made of silica gel material and is in the shape of a semi-cylindrical.

9. The polypropylene film for an in-mold label according to claim 1, characterized by: The upper surface of the hot melt layer (201) is fixedly provided with a plurality of corrugated strips (2011).

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