JP4788568B2 - Manufacturing method of mirror-coated body and mirror-coated body - Google Patents

Description

  The present invention relates to a method of manufacturing a mirror-coated body that prevents cracks caused by processing in the mirror-coated body from growing due to secular change, and a mirror-coated body manufactured by the method of manufacturing the mirror-coated body.

  In the mirror-coated body, the coating is applied to the surface or surface of the base material by making the film thickness relatively large to 100 to 200 μm or more so that the surface is sufficiently smooth without being affected by the unevenness of the surface or front and back surfaces of the base material. It is formed on the back side. For this reason, when a part such as a drill or a router is used to attach a part to a mirror-coated body, or a fixing tool such as a screw or nail is driven, a fine crack occurs in a relatively thick coating film. To do. Since the thermal expansion coefficient differs between the coating film and the base material, interlayer strain stress is applied to the coating film due to repeated temperature changes, and fine cracks eventually grow. For example, in the handle attachment portion of the door, cracks grow beyond the portion hidden by the handle cover, and an appearance abnormality occurs.

  Therefore, conventionally, the coating film part where cracks occurred during processing is removed by sandpaper and repaired in advance, but it is difficult to completely remove fine cracks, and the work is troublesome. It was hanging.

On the other hand, in Patent Document 1, in a door, a connecting edge connected to a handle cover is inserted into a groove formed in the door, a synthetic resin material is filled in the groove, and the connecting edge is embedded and fixed in the groove. Are listed.
JP-A-5-163856

However, in the door described in Patent Document 1, there is no hole formation or a process of driving in a fixing tool such as a screw or a nail for attaching the handle, so the growth of fine cracks generated in the coating film with the process There is no suggestion on how to prevent this. Moreover, because of the handle attachment of connecting edge, a groove and a synthetic resin new technical means that material has been required, it can not be attached conventional handle in the same manner as before. Further, the synthetic resin material is filled in the groove, but the filled synthetic resin material is exposed. Since the appearance is particularly important for a mirror-coated body, it is desirable to avoid exposure of a foreign synthetic resin material on the outer periphery of the handle.

  The present invention has been made in view of the circumstances as described above, and performs processing for attaching parts to a mirror-coated body, and even if a fine crack occurs in the coating film, the crack is in a certain range. An object of the present invention is to provide a method of manufacturing a mirror-coated body capable of preventing the growth beyond the scope and a mirror-coated body manufactured by the method of manufacturing the mirror-coated body.

  In order to solve the above-described problems, the method for producing a mirror-finished body of the present invention is characterized by the following.

First, in the mirror-finished body, corresponding to the surface processed portion where the hole is formed or the fixing tool is driven, the substrate surface is slightly larger than the surface processed portion, and fine cracks generated by the surface processing are hidden, After disposing a sheet having a size not to be exposed, the substrate surface including the sheet surface is mirror-coated.

  Secondly, in the above, the sheet is fibrous.

  Third, in the above, the thickness of the sheet is 5 μm or more and 90 μm or less.

  A fourth aspect of the present invention is a mirror-coated body manufactured by a method for manufacturing a mirror-coated body having any one of the first to third characteristics.

  According to the first and fourth inventions described above, since the mirror-coated body has a sheet directly under the coating film in the surface processing portion where the processing for attaching components and the like is performed, the sheet is coated with the coating film and the base material. Even if a fine crack occurs in the coating film due to processing, the interlayer strain stress is relaxed by the sheet, and it is possible to prevent the crack from growing. Parts can be attached in the same manner as before, and no special means is required. The appearance of the mirror-coated body is maintained well.

  According to the second and fourth inventions, in addition to the effects of the invention described above, since the sheet is fibrous, the coating material is appropriately impregnated and adhesion with the coating film is ensured. No secondary cracks are generated from the boundary.

  According to the third and fourth inventions, in addition to the effects of the invention described above, the growth of cracks can be sufficiently prevented, and the smoothness of the coating film can be sufficiently secured.

  Fig. 1 <a> and <b> are respectively a main part plan view and a main part cross-sectional view showing an embodiment of a method of manufacturing a mirror-coated body and a mirror-coated body according to the present invention.

  In the embodiment shown in FIGS. 1 <a> and <b>, a surface processed portion 2 in the mirror-finished coated body 1, that is, a hole is formed by a drill, a router, or the like to attach a part, a screw, a nail, etc. The sheet 4 is disposed on the front surface or the front and back surfaces of the base material 3 corresponding to the portion where the fixing tool is driven or the like, and then the surface of the base material 3 including the surface of the sheet 4 Or the mirror surface coating is performed to the front and back, and the coating film 5 is formed. The size of the sheet 4 can suppress the growth of fine cracks generated by processing in the coating film 5, that is, the sheet 4 is generated due to a difference in thermal expansion coefficient between the substrate 3 and the coating film 5. It is set to a size that can sufficiently relax the interlaminar strain force. Basically, the size is set to be slightly larger than the size of the surface processed portion 2 of the mirror-coated body 1, and preferably, the size is such that fine cracks are hidden by parts attached to the surface processed portion 2 and are not exposed. Specifically, when the mirror-coated body 1 is, for example, a door, the portion where the handle 6 provided with the handle 6a is attached is covered by the cover 6b of the handle 6 and is covered and not exposed.

Thus, since the surface processing part 2 of the mirror surface coating body 1 is provided with the sheet 4 on the surface or front and back surfaces of the base material 3 and then mirror-coated to form the coating film 5, the mirror surface coating body In the surface processing portion 2 of 1, the sheet 4 exists immediately below the coating film 5, and processing such as formation of holes 7 penetrating the front and back of the mirror-coated body 1 and driving of screws, nails and the like is performed. even if fine fine cracks in the coating film 5, the sheet 4 acts as a buffer layer between the coating film 5 and the substrate 3, the difference in thermal expansion coefficient between the coating 5 and the base 3 Interlayer strain stresses such as those generated can be relaxed by the sheet 4, and cracks can be prevented from growing. Fine cracks are concealed by components attached to the surface processed portion 2 and are not substantially exposed. Accordingly, the appearance of the mirror-coated body 1 is maintained well. Moreover, the attachment of components can be performed in the same manner as in the past, and no special means is required.

  Various sheets can be used as the sheet 4, but a fibrous sheet made of plant natural fibers such as pulp or synthetic fibers such as polyester, polypropylene, and vinyl chloride is preferable. In the case of the fibrous sheet 4, the paint is appropriately impregnated into the sheet 4 during mirror coating, and adhesion with the coating film 5 is ensured, and secondary cracks are generated from the boundary between the sheet 4 and the coating film 5. I will not let you. The sheet 4 can be disposed on the base material 3 by adhesion, adhesion, or the like. Any suitable adhesive or pressure-sensitive adhesive can be selected as long as it does not affect the properties of the sheet 4 and the coating film 5.

  About the thickness of the sheet | seat 4, it can adjust in the range which suppresses the growth of a crack and does not inhibit the smoothness of the surface of the coating film 5. FIG. Since the thickness of the coating film 5 is usually 100 to 200 μm or more as described above, the thickness of the sheet 4 is preferably 5 μm or more and 90 μm or less. If the thickness is less than 5 μm, it is difficult to sufficiently prevent the growth of cracks. If the thickness exceeds 90 μm, the thickness of the coating film 5 is increased, so that it is difficult to ensure sufficient smoothness of the coating film 5.

  The base material 3 is exemplified by a wood material whose front surface or front and back surfaces are formed of a veneer or a solid material.

  The method for producing a mirror-coated body and the mirror-coated body of the present invention exemplified above are particularly preferably applied to fittings such as interior doors and storage doors that are mirror-coated.

  Examples are shown below.

(Example 1, Comparative Example 1)
An interior door was selected as the mirror finish. The interior door had a flash structure, and a face material with a thickness of 5 mm MDF was attached to the front and back of the honeycomb core material, and a natural wood veneer was attached as a surface material.

  The surface processed part was assumed to be a handle attaching part and a through hole of φ20 mm was assumed to be formed.

  A masking sheet made of polyester fiber having a thickness of 25 μm and a size of 30 mm square was adhered to the front and back surfaces of an unpainted base material having the flash structure corresponding to the surface processed portion, and then mirror-coated. (Example 1). Mirror surface coating was performed without bonding the sheet (Comparative Example 1).

  The mirror coating was performed as follows.

Undercoat: Urethane paint Intermediate coat: Polyester paint Topcoat: Urethane acrylate paint (UV curing)
Coating thickness: 150 μm
A through hole having a diameter of 20 mm was formed in the surface processed portion of the mirror-coated body using a woodworking cutter after grooving (N = 4). And the handle was attached. The periphery of the handle of the interior door to which the handle was attached was cut into a 30 cm square, and four samples were prepared. The periphery of each sample was chamfered with # 320 paper and then protected with aluminum tape.

  The growth of the coating film crack of each sample was evaluated by a heat shock test in which the movement between the environments at −35 ° C. for 2 hours was performed within 5 minutes after -5 ° C. for 2 hours and the movement was repeated 50 times. The evaluation results are as shown in Table 1.

実施例１のサンプルでは４検体のいずれにも割れの発生はなく、外観は非常に良好であった。一方、比較例１のサンプルでは、４検体中２検体で取っ手カバーを超える割れの成長が認められた。

In the sample of Example 1, no crack occurred in any of the four specimens, and the appearance was very good. On the other hand, in the sample of Comparative Example 1, growth of cracks exceeding the handle cover was observed in 2 of 4 samples.

<a> <b> are the principal part top view and principal part sectional drawing which showed one Embodiment of the manufacturing method of the mirror surface coating body of this invention, and a mirror surface coating body, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mirror surface coating body 2 Surface processed part 3 Base material 4 Sheet

Claims (4)

Corresponding to the surface processed part where the hole is formed or the fixing tool is driven in the mirror surface coating body , the substrate surface is slightly larger than the surface processed part, and fine cracks generated by the surface processing are hidden and do not appear. A method for producing a mirror-coated body, comprising: disposing a sheet having a certain size and then mirror-coating the substrate surface including the sheet surface.   The method for manufacturing a mirror-coated body according to claim 1, wherein the sheet is fibrous.   The method for producing a mirror-coated body according to claim 1 or 2, wherein the sheet has a thickness of 5 µm or more and 90 µm or less.   A mirror-coated body manufactured by the method for manufacturing a mirror-coated body according to any one of claims 1 to 3.

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