Eyelash mask structure

Abstract

The utility model discloses an eyelash mask structure, relates to the technical field of beauty makeup, and realizes performance breakthrough through double-side symmetrical interlayer design. The core structure is formed by compositing a first PET plane material layer, a second PET plane material layer, an acrylic acid transparent adhesive tape bonding layer, a double-sided polyurethane dyeing layer and a transparent PET protective film. The laminating layer forms a sandwich beam mechanical structure, so that the bending radius of the eyelash mask is reduced to 1.0 mm, the tearing strength is improved to 15 N / mm, and the fracture risk is reduced by 96.7% compared with that of a traditional single-layer structure.

Description

Technical Field

[0001] This utility model relates to the field of cosmetic technology, specifically to an eyelash membrane structure. Background Technology

[0002] With the rapid development of the beauty industry and consumers' increasing demand for refined eye makeup, false eyelashes, as a key product for enhancing the three-dimensionality of the eye contour and the layering of makeup effects, are receiving increasing attention for their ease of wear, naturalness, and safety. Traditional false eyelash products mostly rely on manual application or magnetic fixation techniques, which have drawbacks such as complex operation, easy fall-off, and poor reusability. Meanwhile, new eyelash extension products, which combine quick application and long-lasting hold, are gradually becoming the mainstream in the market. However, existing eyelash film technology still faces the following technical bottlenecks.

[0003] 1. Currently, most mascara masks use a composite structure of a single-layer PET substrate and a single-sided dyeing layer. The substrate thickness is typically in the range of 0.020~0.030mm, resulting in high overall rigidity and a large bending radius. During wear, the single-layer structure cannot effectively buffer the deformation difference between the lash root and the skin around the eyes, easily leading to stress concentration due to repeated bending, causing the substrate to break or the dyeing layer to peel off. Clinical tests show that the crack rate of single-layer mascara masks is as high as 60% after three 180° bends, significantly affecting the user experience.

[0004] 2. If flexibility is improved by reducing the thickness of the substrate, the tear resistance of the material must be sacrificed. For example, although PET film with a thickness of less than 0.018 mm can be bent without breaking, its longitudinal tear strength is less than 8 N / mm. It is easily scratched or torn by tools such as eyelash curlers and tweezers during wearing or removal, resulting in a product scrap rate as high as 25%. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides an eyelash membrane structure that solves the problems mentioned in the background section.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an eyelash membrane structure, comprising:

[0007] First surface layer;

[0008] The second surface layer is disposed opposite to the first surface layer;

[0009] An adhesive layer is disposed between the first surface layer and the second surface layer for bonding the first surface layer and the second surface layer;

[0010] The first dyeing layer is coated and disposed on the surface of the first face material layer opposite to the bonding layer;

[0011] The second dyeing layer is coated and disposed on the surface of the second face material layer opposite to the bonding layer;

[0012] A protective film is attached to the surface of the second dyeing layer opposite to the second face material layer.

[0013] Furthermore, both the first and second surface layers are made of PET material, with a thickness of 0.015±0.002mm and a basis weight of 21±5g / ㎡.

[0014] Furthermore, the bonding layer adopts an acrylic adhesive transparent structure, with an adhesive thickness of 0.010±0.002mm and a base weight of 15±5g / ㎡.

[0015] Furthermore, both the first dyeing layer and the second dyeing layer are made of polyurethane, with a thickness of 0.005±0.002mm and a basis weight of 10±5g / ㎡.

[0016] Furthermore, the protective film is a transparent PET protective film with a thickness of 0.105±0.005mm and a basis weight of 145±5g / ㎡.

[0017] This invention provides an eyelash membrane structure. Compared with the prior art, it has the following advantages:

[0018] 1. This eyelash membrane structure, through a symmetrical composite structure of a double-layer PET surface material layer and an acrylic adhesive layer, reduces the bending radius of the eyelash membrane from 2.5mm in the traditional single-layer structure to 1.0mm. After folding 180°, the surface crack rate is reduced from 60% to ≤2%, effectively avoiding the risk of breakage caused by deformation of the skin around the eyes during wear.

[0019] 2. The double-layer topcoat and bonding layer form a "sandwich beam" mechanical structure with a longitudinal tear strength of ≥15N / mm and a transverse tear strength of ≥12N / mm, which is significantly stronger than the single-layer structure (≤8N / mm). It can withstand accidental contact with tools such as eyelash curlers and tweezers without breaking, and the product scrap rate is reduced from 25% to 0%. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] In the diagram: 1. First dyeing layer; 2. First surface material layer; 3. Adhesive layer; 4. Second surface material layer; 5. Second dyeing layer; 6. Protective film. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1 This utility model provides a technical solution: an eyelash membrane structure composed of multiple functional membrane layers, comprising, from bottom to top: a protective film 6, a second dyeing layer 5, a second surface material layer 4, an adhesive layer 3, a first surface material layer 2, and a first dyeing layer 1. Each layer is bonded together using a specific process to form an integrated structure, possessing flexibility, strength, and decorative appearance. It is suitable for assisting in the wearing of false eyelashes or as a directly transplantable eyelash membrane, as detailed below:

[0024] First surface layer 2 and second surface layer 4

[0025] Material: All are made of biaxially oriented PET polyethylene terephthalate film, which has the characteristics of high transparency and excellent tensile strength.

[0026] Thickness control: The PET base film is cut to a nominal thickness of 0.015mm using precision slitting equipment, with an allowable tolerance range of ±0.002mm, i.e., 0.013~0.017mm, to ensure uniformity of interlayer thickness.

[0027] Basis weight control: An online weighing system is used to monitor the mass per unit area in real time. The target basis weight is 21g / ㎡, and the tolerance range is ±5g / ㎡, i.e., 16~26g / ㎡, to ensure the stability of the material's mechanical properties.

[0028] Surface treatment: The contact surfaces between the face material layer and the bonding layer are corona treated to achieve a surface tension of ≥38 dynes, thereby enhancing the wettability of the adhesive.

[0029] Adhesive layer 3

[0030] Material and process: The acrylic pressure-sensitive adhesive PSA coating process is adopted. The adhesive is evenly coated on the surface of the first surface material layer 2 through a micro-gravure coating head to form a transparent adhesive layer.

[0031] Thickness control: The dry adhesive coating thickness is set to 0.010mm. The coating gap is dynamically adjusted by an online laser thickness gauge, with a tolerance range of ±0.002mm, i.e., 0.008~0.012mm.

[0032] Basis weight control: The target value of the adhesive layer basis weight is 15g / ㎡, with a tolerance range of ±5g / ㎡, i.e., 10~20g / ㎡, to ensure a balance between adhesion and flexibility.

[0033] Curing conditions: The adhesive layer is dried in an 80℃ hot air tunnel for 30 seconds. After complete curing, it is laminated with the second surface material layer 4. The lamination pressure is 0.4MPa and the temperature is 50℃.

[0034] First staining layer 1 and second staining layer 5

[0035] Material: All films are made of water-based polyurethane dispersion (WPU) and colored with environmentally friendly colorant.

[0036] Thickness control: The dyeing paste is coated on the outer surface of the face material layer by a doctor blade coating process. The dry film thickness is set to 0.005mm, with a tolerance range of ±0.002mm, i.e., 0.003~0.007mm.

[0037] Basis weight control: The target value of the basis weight of the dyeing layer is 10g / ㎡, with a tolerance range of ±5g / ㎡, i.e., 5~15g / ㎡, taking into account both color saturation and interlayer adhesion.

[0038] Curing conditions: The dyed layer is dried by hot air circulation at 60℃ for 60 seconds, the surface hardness reaches 2H pencil, and the rubbing fastness is ≥4 grade GB / T3920-2008.

[0039] Protective film 6

[0040] Material: Transparent PET release film with single-sided silicone oil treatment, release force 1~3g / 25mm, ensuring easy peeling before use.

[0041] Thickness control: The base film thickness is 0.105mm, with a tolerance range of ±0.005mm, i.e., 0.100~0.110mm, and is fully inspected by a high-precision thickness gauge.

[0042] Basis weight control: The target basis weight is 145g / ㎡, with a tolerance range of ±5g / ㎡, i.e., 140~150g / ㎡, to ensure the stiffness and tear resistance of the release film.

[0043] Composite process: The protective film 6 is hot-pressed onto the second dyed layer 5 via a silicone oil surface. The composite pressure is 0.2 MPa, and the peel force fluctuation range is ≤ ±2g / 25mm.

[0044] Manufacturing process flow:

[0045] 1. Pretreatment of the surface layer: The PET base film is subjected to corona treatment and the surface tension is tested.

[0046] 2. Adhesive layer coating: Acrylic adhesive is coated on the surface of the first surface layer 2 and then dried and cured in a tunnel.

[0047] 3. Interlayer lamination: The second face material layer 4 and the adhesive first face material layer 2 are hot-pressed together on a laminating machine and then wound up and cured for 24 hours.

[0048] 4. Dyeing layer coating: Apply polyurethane dyeing paste to the outer surface of both layers of material and allow it to dry and cure.

[0049] 5. Protective film lamination: The transparent PET release film is hot-pressed and laminated with the second dyeing layer 5, and then cut into strips.

[0050] 6. Finished product inspection:

[0051] Thickness sampling inspection: 5 points are selected from each roll, and the total thickness is measured using a digital thickness gauge. The target value is 0.140mm, with a tolerance of ±0.010mm.

[0052] 7. Peel test: The peel strength of the protective film is tested according to ASTM D3330 standard, with a value of 10±2g / 25mm.

[0053] 8. Bending test: Fold 180° 5 times and observe whether the dyed layer / adhesive layer cracks.

[0054] Experimental Test

[0055] 1. Flexibility test:

[0056] Cut the eyelash membrane into 10mm×100mm samples, bend them 180° around a 2mm diameter steel rod, and record the number of surface cracks.

[0057] The product in the example has ≤2 cracks, which is better than the single-layer sheet structure with ≥5 cracks.

[0058] 2. Tear resistance:

[0059] Tested according to GB / T 16578.2 standard, the longitudinal tear strength is ≥15N / mm and the transverse tear strength is ≥12N / mm, which is 30% higher than the traditional structure.

[0060] 3. Wearing reliability:

[0061] The simulated wearing / removal of false eyelashes was repeated 50 times. The breakage rate of the product in the example was 0%, while the breakage rate of the traditional structure was 25%.

Claims

1. An eyelash membrane structure, characterized in that, include: First surface layer (2); The second surface layer (4) is disposed opposite to the first surface layer (2); An adhesive layer (3) is disposed between the first surface layer (2) and the second surface layer (4) for bonding the first surface layer (2) and the second surface layer (4). The first dyeing layer (1) is coated on the surface of the first face material layer (2) away from the bonding layer (3); The second dyeing layer (5) is coated on the surface of the second face material layer (4) away from the bonding layer (3); A protective film (6) is attached to the surface of the second dyeing layer (5) away from the second face material layer (4).

2. The eyelash membrane structure according to claim 1, characterized in that, Both the first surface layer (2) and the second surface layer (4) are made of PET material, and both have a thickness of 0.015±0.002mm and a basis weight of 21±5g / ㎡.

3. The eyelash membrane structure according to claim 1, characterized in that, The bonding layer (3) adopts an acrylic adhesive transparent structure with an adhesive thickness of 0.010±0.002mm and a base weight of 15±5g / ㎡.

4. The eyelash membrane structure according to claim 1, characterized in that, Both the first dyeing layer (1) and the second dyeing layer (5) are made of polyurethane, and both have a thickness of 0.005±0.002mm and a basis weight of 10±5g / ㎡.

5. The eyelash membrane structure according to claim 1, characterized in that, The protective film (6) is a transparent PET protective film with a thickness of 0.105±0.005mm and a basis weight of 145±5g / ㎡.

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