JP5610037B2 - Method for forming identification part of resin molded product, method for manufacturing resin molded product - Google Patents

Description

The present invention relates to a resin molded article, a method of the resin molded article to form an identification part indicating the genuine relates to method for producing a resin molded article having an identification part.

  As a resin molded product manufactured by molding a resin material, for example, an ink cartridge used in an ink jet printer is known. In such an ink cartridge, a genuine product is provided by a printer manufacturer or the like. By using this genuine product, the performance of the ink jet printer can be sufficiently exhibited. However, there are cases where non-genuine products having the same appearance as this regular product and having a lower ink quality than the regular product are distributed in the market.

  Therefore, conventionally, in order to prove that the product is a genuine product, a mark is attached to the regular product. However, the same genuine mark may be reproduced and attached to the non-genuine product. Therefore, this mark needs to be difficult to reproduce. As such a mark, a hologram seal, a reflector or the like is employed (for example, see Patent Documents 1 and 2). Whether or not the product is a genuine product is determined by irradiating the hologram seal or reflector with light and detecting the reflected light. Such a hologram seal or the like cannot be duplicated by a color copier and is difficult to reproduce by other means.

JP 2000-1036 A JP 2004-174873 A

  However, the hologram seal and reflector as described above have a problem that the manufacturing cost is high. In addition, a non-genuine product manufacturer with advanced technology may analyze a hologram sticker or the like attached to a genuine product, and the same thing as a real hologram seal or the like may be reproduced and attached to the non-genuine product. . As a result, there is a problem that even a non-genuine product is determined as a regular product.

An object of the present invention, the resin molded article, the identification unit forming method of the resin molded article can be easily formed a hard identifying portion is reproduced, it is to provide a method for producing a resin molded article having the identifying unit .

The method for forming an identification part of a resin molded product according to claim 1 includes: a breaking step of breaking a base material protruding from the surface of the mold and forming a fracture surface in the mold; and a resin material using the mold A molding step for molding and a transfer step for transferring the shape of the fracture surface of the base material to the resin molded product molded in the molding step are provided.
According to a fifth aspect of the present invention, there is provided a method for producing a resin molded product comprising: a breaking step of breaking a base material protruding from a surface of a molding die to form a fracture surface in the molding die; and a resin material using the molding die. A molding step for molding, and an identification portion forming step for forming an identification portion by transferring the shape of the fracture surface of the base material to the resin molded product molded in the molding step. To do.

When the substrate is broken, a fracture surface having fine irregularities is formed. And when the shape of this torn surface is transcribe | transferred to a resin molded product, the identification part which has a fine unevenness | corrugation will be formed. It is impossible to reproduce the same shape as the fine irregularities of the identification part by machining or the like. Moreover, even if the mold is taken from the identification section and the identification section is duplicated using the mold, the duplicate identification section is rounded at the corners of the fine irregularities than the real identification section. It is not possible to duplicate an identification part having the same shape as the part. Therefore, it is possible to form an identification portion that is difficult to be reproduced by a simple method of breaking the base material and transferring the fracture surface of the base material to the resin molded product.

According to a second aspect of the present invention , there is provided the method for forming an identification part of a resin molded product according to the first aspect , wherein the fracture surface is exposed in a direction along a drawing direction of the molding die.

Identifying portion forming method of the resin molded article according to claim 3, in claim 1 or 2, wherein the portion where the fracture surface is formed of the base material protrudes from the mold bottom surface of the concave It is characterized by that.

According to a fourth aspect of the present invention, there is provided the method for forming an identification part of a resin molded product according to any one of the first to third aspects, wherein the base material is formed of a brittle material.

  Thereby, since the base material undergoes brittle fracture without plastic deformation, the shapes of the two fractured surfaces are almost perfectly matched. Therefore, high-precision collation work can be performed.

  According to the present invention, an identification part that is difficult to be reproduced is easily formed by a simple method of breaking a base material to form a fracture surface having fine irregularities and then transferring the fracture surface to a resin molded product. be able to.

  Embodiments of the present invention will be described below. In the present embodiment, an ink cartridge used for an ink jet printer will be described as an example of the resin molded product of the present invention.

  The ink cartridge 1 according to the present embodiment is detachably attached to an ink jet printer (not shown) that performs recording by discharging ink onto a recording sheet, and supplies the ink to the ink jet printer.

  As shown in FIG. 1, the ink cartridge 1 has a substantially rectangular parallelepiped outer shape, a cartridge main body (not shown) that stores ink, and a concave cartridge case 2 that covers substantially the entire cartridge main body. And a lid 3 for closing the cartridge case 2. The cartridge case 2 and the lid portion 3 are integrated by, for example, welding. In addition, the side surface 2a of the cartridge case 2 is provided with an ink lead-out portion 5 for leading the ink stored in the cartridge main body to the outside.

  The cartridge case 2 is formed by injection molding from a synthetic resin material such as nylon, polyethylene, or polypropylene.

  Further, a circular identification portion 4 which is a feature of the present invention is formed on the side surface (surface) 2a of the cartridge case 2. The identification part 4 is formed on substantially the same surface as the side surface 2a. The identification unit 4 has a fine uneven shape.

  Next, the manufacturing process of the cartridge case 2 will be described focusing on the method of forming the identification unit 4.

  First, as shown to Fig.2 (a), the base material 10 formed in the column shape is prepared. As shown in FIGS. 2A and 2B, a tensile load is applied to the base material 10 to break the base material 10 to form the fracture surfaces 13 and 14 (breaking step). Let the base material 10 divided | segmented into two by the fracture | rupture be the fracture | rupture base materials 11 and 12, respectively. The fracture surfaces 13 and 14 are formed on the two fracture base materials 11 and 12, respectively. Since the fracture surfaces 13 and 14 are formed by fracture, they have irregular fine irregularities. Moreover, even if this irregular fine unevenness | corrugation breaks another base material, it is impossible to form the same shape.

  The substrate 10 is preferably formed of a brittle material such as ceramics or cemented carbide. Alternatively, the base material 10 may be formed of a metal material (low temperature brittle material) exhibiting low temperature brittleness such as carbon steel or ferritic stainless steel (for example, SUS430), and the base material 10 may be broken at a low temperature. When the base material 10 made of such a fragile material is broken, fracture surfaces 13 and 14 having micro unevenness of a micrometer level are formed. Moreover, since the base material 10 is brittle fractured without being plastically deformed, the shapes of the two fracture surfaces 13 and 14 are almost perfectly matched. That is, the shape in which the irregularities on one fracture surface 13 and the irregularities are opposite is almost completely the same as the shape on the other fracture surface 14.

  Next, as shown in FIG. 3, a concave outer mold (molding mold) 15 and a convex inner mold 16 are prepared. The inner surface 15a of the outer mold 15 is a surface on which the side surface 2a of the cartridge case 2 is molded. A fracture base 11 is fitted into the outer mold 15. Specifically, the fracture base material 11 is provided on the outer mold 15 such that the fracture surface 13 is exposed to the inside of the outer mold 15 and is located on substantially the same plane as the inner surface 15 a of the outer mold 15. ing. This also means that the fracture surface 13 is located in a space filled with the resin material formed by the outer mold 15 and the inner mold 16. Note that the fracture base material provided in the outer mold 15 may be either the fracture base material 11 or 12.

  Then, a resin material is molded using the outer mold 15 and the inner mold 16 (molding process). Specifically, a resin material is filled in the outer mold 15 (between the outer mold 15 and the inner mold 16) from an injection hole (not shown) provided in the outer mold 15 or the inner mold 16, and the cartridge case 2 is formed by injection molding. Mold. At this time, simultaneously with the molding, the shape of the fracture surface 13 exposed inside the outer mold 15 is transferred to the side surface 2a of the molded cartridge case 2 (transfer process, identification part forming process). As a result, the identification portion 4 having a shape corresponding to the fracture surface 13 is formed on the side surface 2 a of the cartridge case 2. The identification part 4 can be formed in the cartridge case 2 (ink cartridge 1) by the simple method as described above.

  As described above, since the shape of the fracture surface 13 is an irregular fine uneven shape, the formed identification portion 4 also has an irregular fine uneven shape. Therefore, it is impossible to reproduce the same shape as the identification unit 4 by machining or the like. Further, even if a mold is taken from the identification unit 4 and the identification unit 4 is duplicated using the mold, the duplicated identification unit has rounded corners with fine irregularities as compared with the real identification unit 4. Therefore, it is not possible to duplicate an identification part having the same shape as the real identification part 4. Thus, the identification part 4 of the cartridge case 2 (ink cartridge 1) is difficult to reproduce.

  Further, before fitting the fractured substrate 11 into the outer mold 15, an image of fine irregularities of the fractured surface 13 used for collating with the identification unit 4 is acquired. Specifically, a plurality of minute regions to be collated are set in advance from the fracture surface 13 and images of fine irregularities are acquired for the plurality of minute regions. When determining whether or not the ink cartridge 1 is a genuine product, the identification unit 4 of the ink cartridge 1 is observed using an electron microscope or the like, and the region to be collated is collated with the shape of the image. To do. However, the shape of the identification unit 4 and the shape of the fractured surface 13 are reversed, so that matching is performed in consideration of this point. When the shape of the identification unit 4 matches the shape of the image, it is determined that the ink cartridge 1 is a genuine product. On the other hand, if these two shapes do not match, it is determined that the ink cartridge 1 is an irregular product.

  Moreover, when the base material 10 is formed with a brittle material, as described above, the shape of the fracture surface 13 and the shape of the fracture surface 14 are almost completely matched. Therefore, the identification part 4 formed from the fracture surface 13 and the fracture surface 14 have substantially the same shape. Therefore, the collation work can be performed with high accuracy. In addition, when determining whether or not the ink cartridge 1 is a genuine product, the shape of the identification unit 4 can be collated with the shape of the fracture surface 14. Thereby, compared with the case where it collates with the shape of the image of the torn surface 13 where the unevenness | corrugation is reverse to the identification part 4, collation work becomes easy.

  Instead of applying a tensile load to the base material 10 and causing it to break, the base material 10 may be broken by applying a load in a direction perpendicular to the extending direction of the base material 10 to the end of the base material 10. .

  Next, modified embodiments in which various modifications are made to the embodiment will be described. However, those having the same configuration as in the above embodiment are given the same reference numerals and description thereof is omitted as appropriate.

1] In the above-described embodiment, the identification unit 4 is formed on substantially the same plane as the surrounding side surface 2a, but is not limited to this configuration. For example, as shown in FIG. 4, the identification part 4A may be formed on the bottom surface of the concave portion from the side surface 2a (Modification 1). As a result, during the manufacturing process of the ink cartridge 1 or when the manufactured ink cartridge 1 is transported, the identification unit 4A comes into contact with another member or device, and the fine irregularities are damaged or worn away. Can be prevented. Therefore, it is less likely that the genuine ink cartridge 1 is erroneously determined as a non-genuine product, and the discrimination accuracy can be improved.

  As a method for realizing the configuration of the modified embodiment 1, as shown in FIG. 4, the fracture base 11 is provided on the outer mold 15 so as to protrude from the inner surface 15 a of the outer mold 15. That is, the part where the fracture surface 13 of the fractured substrate 11 is formed protrudes from the inner surface 15 a of the outer mold 15. In the cartridge case 2A molded using the outer mold 15, a concave portion is formed from the side surface 2a, and at the same time, the shape of the fracture surface 13 is transferred to the bottom surface of the concave portion, so that the identification portion 4A is formed.

2] In the above embodiment, the base material 10 and the outer mold 15 are separate, and after the base material 10 is broken, the fracture member 11 is fitted into the outer mold 15 and integrated. Alternatively, the base 10 and the outer mold 15 may be integrated. Specifically, instead of the outer mold 15 used in the above embodiment, as shown in FIG. 5 (a), an outer mold 15B having a protrusion 20 formed on the inner surface 15a is prepared. Then, as shown in FIGS. 5A and 5B, a load in a direction orthogonal to the protruding direction is applied to the protruding portion 20 to break the protruding portion 20, and the inner surface 15 a of the outer mold 15 is broken. 21 (breaking step) (Modification 2). Thereby, since the operation | work which fits the fracture | rupture base material 11 in the outer type | mold 15 becomes unnecessary, a manufacturing process is simplified.

3] The transfer step for transferring the shape of the fracture surface 13 to the cartridge case 2 may not be performed simultaneously with the molding step. For example, the transfer process may be performed after the molding process. Specifically, after forming the cartridge case 2C using a normal outer mold (not shown) and the inner mold 16 in which the fractured base material 11 is not fitted, as shown in FIG. 6, the molded cartridge case is formed. While heating 2C, the fracture surface 13 of the fractured substrate 11 is pressed to transfer the shape of the fracture surface 13 to the cartridge case 2C. (Modification 3). Thereby, in the case where there is already an outer mold in which the fractured base material 11 is not fitted, since it can be manufactured using the existing outer mold, it is manufactured as compared with a case where the outer mold 15 is newly manufactured. Cost can be reduced. On the other hand, since the molding process and the transfer process are performed separately, the manufacturing process is simplified in the embodiment in which the molding process and the transfer process are performed simultaneously.

4] The identification unit 4 is not limited to the one constituted only by the fine unevenness, and for example, as shown in FIG. 7, the fine unevenness 32 and the convex shape having a regular shape (fan shape in FIG. 7A). The identification part 4D comprised from the part 33 may be sufficient (modification 4). However, as shown in FIG. 7B, it is preferable that the fine unevenness 32 is formed up to the vicinity of the corner 34 of the root portion of the protrusion 33.

  As a method of realizing the configuration of the modified embodiment 4, as shown in FIG. 8A, in the breaking process, a part of the side surface (surface) of the base material 10D is cut out using an electric discharge machine or the like. A cutout 30 having a general shape (in the form of a fan in FIG. 8A) is formed. Next, as shown in FIG. 8B, a tensile load is applied to the substrate 10D to break the substrate 10D. When a tensile load is applied to the base material 10 </ b> D on which the notch 30 is formed, stress concentration occurs in the notch 30. Therefore, the base material 10D is broken from the notch 30 and becomes two fractured base materials 11D and 12D having fracture surfaces 13D and 14D, respectively.

  Of the two fracture surfaces 13D and 14D, both the regular-shaped concave portion 31 that is a part of the cutout portion 30 and irregular fine irregularities appear on the fracture surface 13D. Since the fine unevenness of the fracture surface 13D is formed by fracture, it exists up to the vicinity of the corner of the opening end of the recess 31.

  When the identification surface 4D is formed using the fracture surface 13D, the identification portion 4D of the cartridge case 2D has a regular convex portion 33 corresponding to the concave portion 31 and an irregular fine irregularity 32 as shown in FIG. Have both. Further, the fine irregularities 32 of the identification part 4 </ b> D exist up to the vicinity of the corners 34 of the root part of the convex part 33. Therefore, even if it is going to produce a type | mold from the identification part 4D, since the material used as a type | mold does not flow easily into the corner part 34 of the identification part 4D, it becomes easy to produce a chip | tip in the produced type | mold. Further, when the mold is peeled off from the identification part 4D, peeling is likely to occur at the corner part 34. Therefore, it becomes more difficult to duplicate an identification part having the same shape as the real identification part 4D.

  Moreover, in the said embodiment, since the discrimination | determination part 4 is formed only by the fine unevenness | corrugation, when discriminating whether the discrimination | determination part 4 is a genuine thing, the collation object preset from the whole discrimination | determination part 4 is carried out It is necessary to find a small area. On the other hand, in the case of this modification, for example, by setting the vicinity of the front end of the fan-shaped convex portion 33 as a target for verification, the target region for verification can be easily found using the front end of the convex portion 33 as a mark. Therefore, the collation work can be performed quickly and easily.

  In addition, the shape of the notch part 30 is not limited to a fan shape. Moreover, when the recessed part which is a part of the notch part 30 is formed in the fracture surface 14D of the fracture | rupture base material 12D, you may form identification part 4D using this fracture | rupture base material 12D. Moreover, you may break the base material 10D by applying the load of the direction orthogonal to the extending direction of base material 10D to the edge part of base material 10D instead of a tensile load.

5] Moreover, as shown in FIG. 9, the identification part 4E comprised from the fine unevenness | corrugation 43 and the convex part 44 which has a predetermined character shape and a predetermined symbol shape may be sufficient (change form 5). However, similarly to the modified embodiment 4, it is preferable that the fine unevenness 43 is formed up to the vicinity of the corner of the root portion of the convex portion 44.

  As a method for realizing the configuration of the modified embodiment 5, as shown in FIGS. 10 and 11A, first, in the breaking process, two metal base pieces 40 and 41 formed in a columnar shape are used. prepare. Then, as shown in FIG. 10, for example, a letter-shaped concave portion 42 of a size “A” that can be visually observed is formed on the end surface (surface) 40 a of one base piece 40. Next, as shown in FIGS. 11A and 11B, the end surface 40a of the base material piece 40 where the recess 42 is formed and the end surface 41a of one base material piece 41 are joined by so-called metal diffusion bonding. The base material 10E is produced by bonding. Subsequently, as shown in FIG. 11C, a tensile load is applied to the manufactured base material 10E to break the base material 10E. Metal diffusion bonding refers to bonding two metal materials by diffusing metal atoms to each other on the bonding surface of the two metal materials by applying pressure while heating at a high temperature in a state where the two metal materials are in close contact with each other. Is the method.

  The breakage of the substrate 10E will be described in detail. Since the two base material pieces 40 and 41 are bonded by metal diffusion bonding, crystal grains grow beyond the bonding surface, and therefore the bonding surface is almost completely eliminated. Therefore, when a tensile load is applied to the base material 10E, the base material pieces 40 and 41 are not separated at the joint surfaces. Further, inside the base material 10 </ b> E produced by joining the two base material pieces 40 and 41, there is a space constituted by the recess 42 of the base material piece 40 and the end surface 41 a of the base material piece 41. . Therefore, when a tensile load is applied to the substrate 10E, stress concentration occurs in the recess 42. Therefore, as shown in FIG. 11C, the base material 10E is broken from the concave portion 42 as the starting point, and becomes two broken base materials 11E and 12E having fractured surfaces 13E and 14E, respectively. Of the two fracture surfaces 13E and 14E, both the concave portion 42 and irregular fine irregularities appear on the fracture surface 13E. That is, the fracture surface 13E includes the recess 42.

  By transferring the fracture surface 13E, as shown in FIG. 9, the cartridge case 2E is formed with an identification portion 4E having a letter-shaped convex portion of “A” that is visually observable. Thereby, the design property of the ink cartridge 1E which has this identification part 4E becomes high. In addition, as a shape of the recessed part 42 formed in the base material piece 40, even if it is a character shape showing a company name, a product name, a model number, an ink color, etc., a company name, or a logo mark (design shape) of a product, for example. Good. Accordingly, the identification unit 4E has a function of identifying the manufacturer and the product name by the convex portion 44 such as a character shape in addition to the function of indicating that it is a genuine product by the fine unevenness 43.

  Similarly to the modified embodiment 4, the identification unit 4E has both the convex portion 44 and the fine unevenness 43, and the fine unevenness 43 exists up to the vicinity of the corner of the base portion of the convex portion 44. Therefore, it is more difficult to take a mold from the identification unit 4E and copy it, and the collation work is quick and easy.

  In FIG. 11C, the base material 10 </ b> E is broken near the boundary between the recess 42 and the end surface 41 a, but may be broken at the bottom of the recess 42. In this case, the recessed part comprised from the end surface 41a and the surrounding wall of the recessed part 42 appears in the fracture surface 14E of the fracture | rupture base material 12E. Accordingly, the fracture surface 14E includes the recess 42, and the identification portion 4E is formed using the fractured base material 12E. Further, instead of the tensile load, a load in a direction orthogonal to the extending direction of the base material 10E may be applied to the end portion of the base material 10E to break the base material 10E.

6] Moreover, in the said modification 5, although the two base material pieces 40 and 41 shall be joined by metal diffusion bonding, it is not limited to this joining method. Any bonding method other than metal diffusion bonding may be used as long as it is a method having such a high adhesive force that the substrate 10E does not separate on the bonding surface when a tensile load is applied to the substrate 10E (Modification 6). . Furthermore, in this case, the base material pieces 40 and 41 are not limited to metal, and can be selected from the materials of the base material 10 described in the above embodiment.

  As mentioned above, although the modified forms 1-6 were demonstrated, the modified forms 1-3 and the modified forms 4-6 can also be implemented in combination, respectively.

  For example, the identification part which has both convex parts, such as a character shape, and a fine unevenness | corrugation may be formed in the bottom face of the concave part from the side surface of the ink cartridge combining the modified form 1 and the modified form 5. Thereby, since the convex part of an identification part does not protrude from a side surface, it can prevent that convex parts, such as a character shape, are damaged in the case of a manufacturing process or the time of transportation.

  Further, after combining the modified embodiment 2 and modified embodiment 4 to form a notch on the side surface of the projecting portion formed on the inner surface of the outer mold, a load is applied to the projecting portion to break the projecting portion from the notched portion. You may let them.

  As described above, an example in which the present invention is applied to an ink cartridge used in an ink jet printer has been described as an embodiment of the present invention. However, the application target of the present invention is not limited to this, and a resin molded product other than an ink cartridge is used. Can be applied to. The method for molding the resin molded product is not limited to injection molding, and may be a molding method other than injection molding as long as it uses a molding die.

It is a perspective view of an ink cartridge according to an embodiment of the present invention. It is a perspective view which shows a fracture | rupture process. It is sectional drawing which shows a formation process and a transfer process. It is sectional drawing which shows the shaping | molding process and transfer process of the modification 1. It is sectional drawing which shows the fracture | rupture process of the modification 2. It is sectional drawing which shows the transfer process of the modification 3. It is an enlarged view which shows the cartridge case of the modified form 4, Comprising: (a) is a side view, (b) is the BB sectional drawing in (a). It is a perspective view which shows the fracture | rupture process of the modification 4. FIG. 10 is a perspective view of an ink cartridge according to a modified embodiment 5. In the fracture | rupture process of the modified form 5, it is a perspective view which shows the state before joining two base material pieces. It is sectional drawing which shows the fracture | rupture process of the modification 5.

1, 1E Ink cartridge (resin-formed product)
2, 2A, 2C, 2D, 2E Cartridge Case 2a Side (Surface)
4, 4D, 4E Identification part 10, 10D, 10E Base material 11, 12, 11D, 12D, 11E, 12E Breaking base material (base material)
13, 14, 13D, 14D, 13E, 14E Fracture surface 15, 15B Outer mold (molding mold)
15a Inner surface 16 Inner mold 20 Protruding part 21 Broken surface 30 Notch part 31 Recess 40, 41 Base piece 40a, 41a End face (surface)
42 recess

Claims (6)

A breaking step of breaking the base material protruding from the surface of the mold and forming a fracture surface in the mold ;
A molding step of molding a resin material using a molding die, and a transfer step of transferring the shape of the fracture surface of the base material to the resin molded product molded in the molding step;
A method for forming an identification part of a resin molded product, comprising: The identification part forming method for a resin molded product according to claim 1, wherein the fracture surface is exposed in a direction along a drawing direction of the mold. The portion where the fracture surface is formed of said substrate, the identification unit forming method of the resin molded article according to claim 1 or 2, characterized in that protruding from the mold bottom surface of the concave. The said base material is formed with the brittle material, The identification part formation method of the resin molded product in any one of Claims 1-3 characterized by the above-mentioned. A breaking step of breaking the base material protruding from the surface of the mold and forming a fracture surface in the mold ;
A molding step of molding a resin material using a mold;
An identification part forming step of forming an identification part by transferring the shape of the fracture surface of the base material to the resin molded product molded in the molding process;
A method for producing a resin molded product, comprising:   The method for producing a resin molded product according to claim 5, wherein the portion where the fracture surface is formed is formed on a bottom surface of the concave mold.

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