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A technology of composite materials and brittle materials, applied in the field of splitting composite materials, can solve problems such as difficulty and degradation of end face quality
Pending Publication Date: 2022-03-01
NITTO DENKO CORP
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[0010] However, although the processing technology using an ultrashort pulse laser is effective for a single brittle material such as glass, when it is used to split a composite material in which a brittle material layer and a resin layer are laminated together, the quality of the cut end surface will deteriorate. lower, so it is difficult
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Embodiment 1
[0139] In Example 1, first, a polyvinyl alcohol-based film was dyed with a dichroic substance such as iodine or a dichroic dye, and uniaxially stretched to obtain a polarizer. The thickness of the polarizer was 28 μm.
[0140] Next, an acrylic protective film (thickness: 40 μm) was bonded to one surface of the polarizer, and a cellulose triacetate protective film (thickness: 30 μm) was bonded to the other surface to obtain a polarizing film 21 . Then, a polyethylene terephthalate release film (thickness: 38 μm) as a release liner 23 was bonded to the polarizing film 21 via an acrylic adhesive (thickness: 30 μm) as an adhesive 22, The main body of the resin layer 2 was obtained.
[0141] On the other hand, as the brittle material layer 1 , a glass film (manufactured by NEC Glass Co., Ltd., trade name "OA-10G", thickness: 100 μm) was prepared.
[0142] In addition, as the adhesive 24, 70 parts by weight of CELLOXIDE 2021P (manufactured by Daicel Chemical Industry Co., Ltd.), 5...
Embodiment 2
[0148]
[0149] In Examples 2-11, such as Figure 4 As shown, at least one of the output of the second laser light source 20b, the spot diameter Db of the laser light L3, and the relative moving speed of the laser light L3 is set to be different from that of Embodiment 1, and under other conditions identical to that of Embodiment 1, the Composite 10 breaks.
[0150]
[0151] In the reference example, the brittle material layer 1 was irradiated with laser light L3 oscillated by the second laser light source 20 b from the resin layer 2 side, and the composite material 10 was divided under the same conditions as in Example 1.
[0152]
[0153] The presence or absence of cracks was evaluated by visually observing the end faces of the brittle material layer 1 of the composite material 10 (composite material sheet) split by the splitting method of Examples 1 to 11 and the reference example.
[0154] Figure 4 "A" and "B" described in the column of "fracture state of brittle ...
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Abstract
The invention provides a method for breaking a composite material, which does not generate cracks on the end surface of a brittle material layer and does not deteriorate the quality of the end part of a resin layer. The present invention is a method for breaking a composite material (10) in which a brittle material layer (1) and a resin layer (2) are laminated, the method comprising: a resin removal step for irradiating the resin layer with laser light (L1) oscillated by a first laser light source (20a) along a planned breaking line (DL) of the composite material to form a processing groove (25) along the planned breaking line; a brittle material removal step in which, after the resin removal step, the brittle material layer is irradiated with laser light (L2) oscillated by an ultra-short pulse laser light source (30) along the planned breaking line to form a processing trace (11) along the planned breaking line; and a brittle material layer breaking step in which, after the brittle material removal step, the brittle material layer is irradiated with laser light (L3) oscillated by a second laser light source (20b) from the opposite side to the resin layer, thereby generating thermal stress on the brittle material layer and breaking the brittle material layer.
Description
technical field [0001] The invention relates to a method for breaking a composite material formed by laminating a brittle material layer and a resin layer. In particular, the present invention relates to a method capable of breaking a composite material without causing cracks on the end faces of the brittle material layer and without deteriorating the quality of the ends of the resin layer. Background technique [0002] In recent years, liquid crystal panels have been thinned and high-definition, and in order to diversify the interface, liquid crystal panels equipped with touch sensor functions on the screen are used in a wide range of fields from mobile phones to information displays. [0003] As a liquid crystal panel equipped with a touch sensor function, the following liquid crystal panel is generally used: a film or glass having a sensor function is laminated on a polarizing film, and a thick adhesive layer (OCA , Optical Clear Adhesive: Optically Transparent Adhesive)...
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