A laser light film structure

Abstract

The utility model discloses a laser light film structure, from down to top is in turn opalescent film, first glue layer, laser pattern unit, editable bottom white layer, chromatic pattern layer, second glue layer and transparent protective film. The film structure of the utility model has laser light effect, can play the role of attracting eyeball, also does not lose soft feeling, and can selectively not interfere with partial printing pattern.

Description

Technical Field

[0001] This utility model belongs to the field of packaging film material technology, and in particular relates to a laser-etched flowing light film structure. Background Technology

[0002] Laser patterns have excellent decorative effects and a modern, luxurious feel. Applying laser patterns to packaging can greatly enhance the product's image, which is why their use on packaging is becoming increasingly popular with businesses.

[0003] For products like sanitary napkins and diapers, manufacturers require that the packaging designs be eye-catching yet maintain a soft feel, while also ensuring that some details of the designs remain undisturbed.

[0004] Using laser patterns on packaging films can attract attention, but the laser effect is too strong and lacks softness. Moreover, the existing laser effects are all displayed on the film, which causes some printed patterns to be interfered with by the laser effect, affecting the overall visual effect. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a laser flowing light film structure. The film of this structure has a laser flowing light effect, which can not only attract attention but also have a soft feel. It can also selectively avoid interfering with local printed patterns, thereby overcoming the shortcomings of the existing technology.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A laser-etched light film structure is characterized by comprising, from bottom to top, a milky white film, a first adhesive layer, a laser pattern unit, an editable white base layer, a color pattern layer, a second adhesive layer, and a transparent protective film.

[0007] By employing the above technical solution, an editable white background layer is set above the laser pattern unit. This editable white background layer has different transmittance at different positions, including fully transparent areas, opaque areas, and gradient transparent areas. The fully transparent areas completely display the laser pattern, resulting in a strong laser background for the color pattern in that area. The opaque areas do not display the laser pattern, ensuring the color pattern remains undisturbed and maintains a clean and crisp effect. The gradient transparent areas allow the laser pattern to display different degrees of laser effect depending on its location's transmittance, softening the laser and creating edge transitions, thus presenting a layered, richly varied, and softly flowing light effect.

[0008] Therefore, the thin film structure of this invention has a laser-like flowing light effect, which can attract attention without losing its softness, and can selectively avoid interfering with local printed patterns. Attached Figure Description

[0009] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a flowchart illustrating the steps involved in the fabrication of a laser-etched luminous film. Figure 3 This is a schematic diagram of the structure of the laser transfer film. Detailed Implementation

[0010] like Figure 1 As shown, the structure of the laser flowing light film of this utility model consists of, from bottom to top, a milky white film 101, a first adhesive layer 102, a laser pattern unit 103, an editable white base layer 104, a color pattern layer 105, a second adhesive layer 106, and a transparent protective film 107.

[0011] The laser-like film structure employs, for example... Figure 2 It is made using the method shown below, with the specific steps as follows.

[0012] S101, Fabrication of milky white film and laser transfer film The milky white film is manufactured using existing mature technology and can be purchased directly from the market; therefore, it will not be described in detail here. In this embodiment, the milky white film is preferably a PE milky white film with a thickness of 40-75 μm and an opacity >80%. The glossy side of the PE milky white film needs to be corona-treated with 39-42 dynes, while the non-glossy side does not require corona treatment.

[0013] The method for manufacturing laser transfer films is as follows: First, a release layer is coated on the PET film substrate. The release layer is made of acrylic resin and the coating thickness is 0.8-1.2μm.

[0014] Next, a laser pattern is molded onto the release layer. This laser pattern can be any pattern required for the packaging, such as platinum ice-point diamonds, platinum floral patterns, triangular colored lenses, platinum water ripples, or brushed light pillars. In this embodiment, the selected laser pattern is a brushed light pillar.

[0015] Finally, an inorganic coating is deposited onto the laser pattern. This inorganic coating is either aluminum or zinc sulfide. In this embodiment, the inorganic coating is zinc sulfide, and the coating thickness is 35-60 nm.

[0016] like Figure 3 As shown, the laser transfer film consists of a substrate layer 131, a release layer 132, and an inorganic coating layer 133 from top to bottom. The side of the release layer 132 that contacts the inorganic coating layer 133 has a laser pattern.

[0017] The release layer and the inorganic coating form the laser pattern unit.

[0018] S102. Transfer the laser pattern unit in the laser transfer film to the glossy side of the milky white film.

[0019] Specifically, the laser pattern units in the laser transfer film are laminated to the glossy side of the milky white film using a first adhesive, and then the PET film is removed. After lamination, the inorganic coating side of the laser pattern units is bonded to the milky white film using adhesive. In this step, the first adhesive can be purchased directly from the market, for example, a polyurethane-based solvent-free adhesive. The specific lamination process conditions are: adhesive application rate 1.4-1.6 g / m³. 2 The temperature of the glue pipe is controlled at 48℃, the temperature of the metering roller is controlled at 48℃, the temperature of the coating roller is controlled at 58℃, and the temperature of the laminating roller is controlled at 55℃; the lamination speed is 150m / min, the curing temperature is 40-45℃, and the curing time is 36-48 hours.

[0020] Because the acrylic resin used as the centrifugal layer is transparent, the laser pattern located under the centrifugal layer can be seen through the centrifugal layer after lamination.

[0021] S103. Print an editable white background layer above the laser pattern unit.

[0022] The editable white background layer is printed with milky white ink. Before printing, transparent areas, opaque areas, and transparent gradient areas are edited through plate making, so that the editable white background layer has different transmittance in different positions after printing.

[0023] S104. Print the color pattern layer on the editable white base layer.

[0024] In this embodiment, a high-definition flexographic printing process is used to print the color pattern. The aforementioned white background layer and color pattern layer can be printed in one pass using a satellite-type 10-color flexographic printing press.

[0025] The color pattern layer is printed with transparent ink, so that the laser pattern underneath can be seen through the color pattern layer.

[0026] S105. A transparent PE protective film is laminated onto the color pattern layer. This ensures the peel strength of the composite structure and the sealing strength of the bag.

[0027] In this embodiment, the PE transparent protective film is preferably a matte PE film. This PE protective film requires a corona discharge of 39-41 dynes and a thickness of 30 μm.

[0028] After laminating the PE protective film and the PE milky white film, the heat-sealing strength of the non-corona-exposed surface must be considered, with a heat-sealing strength >1.1 N / mm. The PE protective film is then laminated onto the color pattern layer using a second adhesive.

[0029] In this step, the second adhesive can be purchased directly from the market and is also a polyurethane-based solvent-free adhesive. The specific lamination process conditions are: adhesive application rate 1.4-1.6 g / m². 2 The temperature of the glue pipe is controlled at 48℃, the temperature of the metering roller is controlled at 48℃, the temperature of the coating roller is controlled at 58℃, and the temperature of the laminating roller is controlled at 55℃; the lamination speed is 150m / min, the curing temperature is 40-45℃, and it is fully cured for 72 hours, so that the interlayer peel strength reaches >4.5N / 15mm.

[0030] Using matte PE film gives the final film product a matte finish. Of course, if a matte finish is not desired, matte PE film can be omitted. Using high-gloss, low-haze PE transparent film will create a different kind of high-gloss, shimmering packaging effect.

Claims

1. A laser-etched flowing light film structure, characterized in that, From bottom to top, the layers are: a milky white film, a first adhesive layer, a laser pattern unit, an editable white base layer, a color pattern layer, a second adhesive layer, and a transparent protective film. The editable white base layer has fully transparent areas, opaque areas, and gradient transparent areas.

2. The laser-etched flowing light film structure according to claim 1, characterized in that: The milky white film is a PE milky white film.

3. The laser-etched flowing light film structure according to claim 1, characterized in that: The transparent protective film is a matte PE film or a transparent PE film.

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