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A technology of laser welding and composite molding, used in laser welding equipment, welding equipment, manufacturing tools, etc., can solve the problem of lack of records, and achieve the effect of strong bonding or attachment and excellent recyclability
Inactive Publication Date: 2007-03-21
DAICEL POLYMER LTD +1
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However, Patent Document 7 does not describe label characteristics that can effectively adjust the degree of shielding (shielding characteristics) of a resin molded product as a substrate without impairing laser weldability.
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Embodiment 1～12 and comparative example 1
[0094] (1) Production of labels
[0095] Using the resins and colorants shown in Table 1, sheets A to M having the thicknesses shown in Table 1 were prepared. Table 1 shows the results of evaluating the total light transmittance, haze value, and laser transmittance of the obtained sheet. The obtained sheet was cut into a size of 20 mm×60 mm to prepare a label.
[0096] (2) Laser welding
[0097] Using black colored high-impact polystyrene (HIPS) (carbon black (CB) content of 0.5% by weight) and black colored acrylonitrile-styrene-butadiene (ABS) resin (carbon black (CB) content of 0.5% by weight) to form a sample of a molded product (100 mm in length x 100 mm in width x 2 mm in thickness). Place the label produced in the above step (1) on the sample of the molded product, place a transparent glass plate as a weight on the label, and use a 120W laser welding machine (semiconductor laser, wavelength 940nm) manufactured by Fine Device Co. , and weld both (welding condition I:...
Embodiment 13
[0110] (1) Fabrication of labels with absorbent layers
[0111] By the multilayer extrusion method, on the resin layer having the same composition as sheet C in Table 1, a masterbatch (manufactured by Dainippon Seika Kogyo Co., Ltd.) containing 100 parts by weight of the same HIPS as above and carbon black (CB) was formed. PS-M SSC 98H 822D black) 2 parts by weight of an absorbing layer with a thickness of 10 μm to prepare a label with such a two-layer structure. In addition, the thickness of the said resin layer was set to 339 micrometers similarly to sheet C. In this example, the sheet constituting the resin layer is referred to as "sheet C" for convenience. In addition, the total light transmittance, haze value, and laser light transmittance of the resin layer can refer to the transmittance in photo C, respectively.
[0112] (2) Laser welding
[0113] In addition, the label and the bonded body were welded in the same manner as in Example 3, except that HIPS was used inst...
Embodiment 14
[0115] (1) Fabrication of labels with absorbent layers formed
[0116] A HIPS film (thickness: 20 μm, absorbing layer) containing carbon black (CB) was thermally laminated on sheet C (resin layer) in Table 1 to produce a label with a two-layer structure.
[0117] (2) Laser welding
[0118] In addition, the label and the bonded body were welded in the same manner as in Example 3, except that HIPS was used instead of the carbon black (CB)-containing HIPS of Example 3 as the bonded body. Table 3 shows the welding evaluation under each condition and the peeling test results of the welded sheet.
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Abstract
The laser-transmissive welding label of the present invention is a resin label which comprises at least a resin layer and is affixable to a resin shaped article by a laser welding, wherein the resin layer has a light-scattering property, and the transmittance of the resin layer relative to a laser beam having an oscillation wavelength within the range of 740 to 1100 nm is not less than 20%, and the total light transmittance of the resin layer relative to a visible light (in accordance with ASTM D1003) is not more than 50%. The resin layer may comprise a thermoplastic resin which may have a compatibility with a resin for the resin shaped article. The label may be able to mask the resin shaped article, or may be colored with a coloring agent. A shaped composite article (e.g., a toner cartridge) may be formed by bonding the label to the resin shaped article with use of the laser welding. The present invention provides the resin label which is affixable to the resin shaped article in an easy and simple way, without an adhesive.
Description
technical field [0001] The present invention relates to a useful label attached or bonded to a resin molded product by laser welding, and a composite molded product in which the label is bonded (or bonded) to the resin molded product. Background technique [0002] Conventionally, for molded products such as resin molded products, a label in which printing is performed on one surface and a release paper is bonded to the other surface with an adhesive is generally used. However, such a method requires multiple steps in label production, and at the same time, the release paper must be peeled off and the position must be aligned to attach the molded product, which is very cumbersome. Furthermore, when reusing the molded product with the label attached, the label must be peeled off, making it difficult to recycle. [0003] Thus, molded articles that are easy to reuse and recycle even if labels are attached are being studied. For example, Japanese Patent Laid-Open No. 2000-43177...
Claims
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Application Information
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