JP2007069566A - Resin molded component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin molded component having a label bonding surface which realizes attachment of a label difficult to come off and easy to take off and is superior in recycling efficiency. <P>SOLUTION: The resin molded component comprises the label bonding surface to stick a label 1, wherein within a limit of the label bonding surface, a periphery of the label bonding surface is made to be a smooth periphery smooth surface 2, a central domain of the inside is made to be a central uneven surface 3 with a fine irregularity, powerful adhesive strength with a label is secured by the periphery smooth surface 2, and adhesive strength reduction of the label 1 and absorption of gas generated from a resin are worked by the irregularity of the central uneven surface 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a resin molded product, and more particularly to a resin molded product such as a resin cover to which labels such as a rating plate are attached in general industrial products such as home appliances and office machine products.

  Conventionally, in the recycling process of industrial products, it has been reported that 30 to 40% in terms of work time is required for the work of peeling labels. This is because, in industrial products, resin molded products are frequently used for covers, and it takes time to remove the label as a pretreatment for recycling the resin molded products. The working time is the cost of the process, and the cost of the recycled resin material is increased by this label peeling work.

  On the other hand, for electric products, it is required by law to display the rated voltage, power consumption, safety precautions, etc. of the products by attaching labels. That is, in the recycling work of very general electric products and office machine products whose cover is made of resin, the above-mentioned label peeling work is an indispensable pretreatment process, which contributes to increase the recycling cost. .

  Thus, several methods have been proposed in the past for improving the efficiency of the label peeling operation. For example, Patent Document 1 proposes a “compatibility” between the label and the resin molded product and a “weak adhesion” between the label and the resin molded product.

(1) “Compatibility” First, “compatibility” means “compatible material label” that can melt the label material together with resin molded products such as resin cover during recycling. Is to use. That is, if the material of the label is made of the same or similar material as the resin molded product, there is no problem even if it is melted together without peeling off the label even during recycling. Specifically, the compatibility of polyethylene terephthalate (PET) material labels with polycarbonate (PC) and acrylonitrile butadiene styrene copolymer (ABS) materials often used in the exterior of office machine products is a widely recognized combination. It is.

  However, even in the case of a combination of compatible materials described above, labels are often peeled off at the site of recycling. And the reason can mention the following two reasons.

  (A) In a recycling site, various types of products are often processed by the same worker. Rather than checking for compatibility for each product, simplifying the work and unifying the work, such as “process after removing all labels,” can reduce the occurrence of errors. Efficient.

  (B) The ink or adhesive material on the label melted together with the resin molded product causes a defect due to a foreign substance called “contamination” in the subsequent process. This “contamination” occurs due to various factors, and is generated not only by dust in the resin but also by dust in the molding machine. However, in order to obtain a recycled material with higher quality and higher value, it is desirable that there is no mixing of labels as foreign matters. Therefore, in recycling, it is considered desirable to remove the label in order to improve the quality of the recycled material.

(2) Thing due to “weak adhesion” Secondly, “weak adhesion” means that a weak adhesive label is used to reduce the force required for the peeling operation and facilitate the operation. .

  However, in this case, the labels become extremely weak against peeling when the end portion begins to peel off. That is, if the adhesive force is weakened, the adhesive force at the end portion is also weakened, so that the adhesive force against an external force such as “rubbing force” is also weakened, resulting in a problem that reliability is lowered.

  In addition to Patent Document 1 described above, techniques as described in the following (3), (4), and (5) have been proposed.

(3) Inlay type display The inset type display substitutes a label by inset type display without fixing by adhesion. However, this method is unsuitable for the statutory labels required for the home appliances described above, and there is little experience in terms of reliable adhesion, and there is anxiety.

(4) Items that are provided with recesses and holes at the beginning of peeling on the label application surface Labels are provided with recesses and holes for triggering on the label application surface of the resin molded product because there is an opportunity to start peeling. It is. However, this improves the work at the beginning of peeling, but the problem remains that it does not improve the work of peeling it against the adhesive strength of the strong label thereafter.

(5) A structure in which the whole or part of the label attachment surface can be broken off. This is a structure in which the whole or part of the label attachment surface can be broken off from the resin molded product. It replaces the work of excising part of the product. However, this plan needs to give up the regeneration of the excised part.
JP 2000-043177 A

  As described above, various problems remain in the improvement plan of the label peeling work that has been proposed as described above. Accordingly, an object of the present invention is to solve the following two problems that are problematic when the label is peeled off from the resin molded product during recycling.

  First, since the force required for peeling is large, the label peeling workability is deteriorated. In particular, a wide label requires a large force to peel it off. Assuming an operation of removing hundreds or thousands of labels per day at the recycling site, the large force required to remove the labels is a major problem in the recycling process. Conventionally, at least two countermeasures have already been proposed for this problem.

  As shown in FIGS. 2 (a) and 2 (b), the first countermeasure is to provide a concave portion or a hole, in FIG. This is a method of reducing the adhesion area of the label 101.

  In this method, the outer peripheral adhesive surface 102 of the label attaching surface S1 is a flat surface, the label 101 having a strong adhesive force is used, and the adhesive force between the outermost peripheral portion of the label 101 and the outer peripheral adhesive surface 102 of the label attaching surface S1 is increased. While maintaining, the hole 103 reduces the adhesive force only at the center. Since the adhesive force at the outermost peripheral portion of the label 101 is strong, the end portion of the label 101 is not easily peeled off by the action of an external force such as “rubbing”, and after the reliability of the adhesive force is ensured, it is once peeled off. It is intended that it can be peeled off with little force.

  In addition, this method uses a method in which a hole 103 is provided in the central portion of the label attaching surface S1, and the adhesive force at the outermost peripheral portion of the label 101 is different from the adhesive force at the central portion. By this method, it is possible to solve two requirements that are in a trade-off relationship in the label of “(usually) difficult to peel but easy to peel (when recycling)”.

  However, this method has the following problems. That is, as shown in FIG. 2 (c), a corner mark 105 serving as a boundary between the outer peripheral adhesive surface 102 provided on the label attachment surface S 1 of the resin molded product 104 and the hole 103 appears on the surface of the label 101. End up. Further, the label 101 may be damaged and torn by using the corner mark 105 as a trigger. Furthermore, when the sharp object 106 hits the non-adhered label surface 101A corresponding to the hole 103, there is a problem that it is easy to be scratched and torn or a hole is easily opened.

  As a second countermeasure, there is a method of weakening the adhesive strength of the label itself. However, this method has a problem that the end portion is easily peeled off as described in item (2) above. Therefore, this method can be performed only when there is a certainty that an external force for removing the label does not occur in the actual use state of the product, or when the label may be removed.

  Next, the second problem is a problem that the force required for peeling further increases in order to prevent bubbles caused by gas generated from the resin molded product to which the label is attached in a high temperature environment.

  In general, when a resin made by injection molding is placed in an environment of about 50 ° C. or higher, a small amount of gas is generated from the inside. When a label made of a highly confidential material such as a PET label is attached to a resin molded product, gas is generated from the resin molded product when placed in a high-temperature environment during the transportation of the product. Due to this gas, a small bubble-like bulge is generated at the label adhesion portion between the label and the resin molded product. As shown in FIG. 3, a random bulge 202 occurs in the label 201, which is not preferable in appearance and weakens the adhesive force unexpectedly.

  For this reason, in order to maintain the label 201 with a sufficient adhesive force, the label 201 is set so that the adhesive force of the label 201 is higher and the adhesive surface is wider.

  This method has an adverse effect on the workability of the label peeling work during recycling. However, this is because the label is originally required to have a contradiction that “it is usually difficult to peel off and easy to peel off during recycling”. In this example, it is difficult to remove the label because it is difficult to remove the label, that is, the reliability of the label is improved.

  On the other hand, as shown in FIG. 2, the method of “making a part of the pasting surface into a concave shape or a hole” taken up as a countermeasure for the first problem described above is a means that can solve this gas problem. is there. The amount of gas generated is actually very small, so if mixed with the air accumulated in the holes or recesses, the volume of the air increases only slightly, and the swelling of the label is not noticeable or peels off. It doesn't bulge enough to let it go. However, as described above, there is a problem of the corner mark 5, and there has been a strong desire to solve this problem.

  Accordingly, an object of the present invention is to solve the above-described problems of the prior art, and to provide a structure that does not normally affect the appearance of a step or the like and is difficult to peel off during recycling. Another object of the present invention is to provide a resin molded article having a label-attached surface that can absorb generation of bubbles due to gas generated from the resin.

  In order to achieve the above object, the present invention provides a resin molded article having a label-attached surface to which labels are attached, wherein an outer periphery of the label-attached surface within the range of the label-attached surface is a smooth surface, and the label The region inside the adherend surface is a resin molded product characterized by being an uneven surface having unevenness.

  That is, the label attaching surface ensures strong adhesion by making the outermost periphery smooth along the outer shape of the label, and the center of the label attaching surface is a surface with fine irregularities, The surface area is reduced. In addition, a structure in which gas generated from the resin is stored in a thin and wide area at the center of the label due to the fine recesses. This minimizes the change in bonding area and the amount of swelling.

  According to the present invention, since the adhesive strength of the outer peripheral portion of the label can be increased and the adhesive strength of the central portion can be weakened, the label attached to the resin molded product is usually difficult to peel off and is easily peeled off during recycling. Can be.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following drawings of one embodiment, the same or corresponding parts are denoted by the same reference numerals. FIG. 1 shows a resin molded product according to an embodiment of the present invention.

  That is, as shown in FIGS. 1A and 1B, the resin molded product 4 according to this embodiment is provided with a label attaching surface S on which the labels are attached. Moreover, the outer peripheral part of the label adherence surface S within the range of the label adherence surface S is a smooth outer peripheral smooth surface 2, and the central region on the inside thereof is a central uneven surface 3 having fine unevenness.

  The label 1 is made of, for example, a wide rectangular sheet material. Various information is printed on the surface with ink or the like, and an adhesive material layer (not shown) is uniformly provided on the back surface.

  Further, the entire label attaching surface S has a rectangular shape that is slightly larger than the outer shape of the label, and has a concave shape with a slight step 41.

  The outer peripheral smooth surface 2 is provided so that the outer peripheral portion of the label attaching surface S is bordered in a frame shape with a predetermined width, and the outer peripheral portion of the label 1 is bonded to the entire periphery with a predetermined width. . This outer peripheral smooth surface can be bonded to the label 1 with a strong force. The central uneven surface 3 is a surface having a fine uneven shape called a so-called textured surface. A resin molded product such as a resin cover is often subjected to a textured surface, which is a general treatment and can be easily molded.

  FIG. 1B shows a state where the label 1 is attached to the label attaching surface S. In FIG. 1 (b), the unevenness of the central uneven surface 3 is depicted schematically in a large and easy-to-understand manner ignoring the scale. As symbolized by FIG. 1B, the label 1 and the resin molded product 4 are in close contact with each other on the outer peripheral smooth surface 2, but the central uneven surface 3 is in contact only with the apex of the unevenness. For this reason, the adhesive force of the label 1 is very low within the range of the central uneven surface 3.

  As a result, although the adhesive surface of the label 1 itself is uniform, the outermost peripheral adhesive force is strong and has a strength that does not turn over due to disturbance, but the overall peel force is small.

  Further, for example, even when the resin component 4 is placed in a high temperature environment and gas is generated from the inside, the concave portion of the central uneven surface 3 plays a role like an air passage extending over a wide area. The gas diffuses throughout the central uneven surface 3. In this way, the generated gas diffuses widely on the bonding surface, so that the blister is indistinguishable, and a situation where a part of the bonded surface is peeled off in the form of bubbles by the gas does not occur.

Similarly, compared to the example in which a concave portion or a hole is provided in the central portion of the label attaching surface according to the prior art shown in FIG.
1. A boundary with a smooth surface appears in the appearance.
2. The corners can scratch the label.
3. Like the type with a hole on the adhesive surface, the label is easily damaged.
All of these problems are unlikely to occur.

  As described above, according to the present invention, it is possible to adhere a label that is “usually difficult to peel off and easy to peel off during recycling” without causing any harmful effects, and there is also a problem of gas bubbles generated from the resin in a high temperature environment. Can be solved.

  Moreover, the uneven surface can be easily formed by subjecting the uneven surface of the label-coated surface to a texture treatment. Then, by providing the uneven surface on the label-coated surface, the gas generated from the resin can be stored in a thin and inconspicuous manner by the fine concave portion at the center of the label.

Fig.1 (a) is a perspective view explaining the label attachment surface of the resin molded product by one Embodiment of this invention, FIG.1 (b) is typical sectional drawing of the label attachment surface of Fig.1 (a). It is. FIG. 2A is an exploded perspective view for explaining a label-attached surface of a resin molded product according to the prior art, and FIG. 2B is a perspective view in a state where the label of FIG. FIG. 2C is a schematic cross-sectional view of the label attachment surface of FIG. It is a schematic cross-sectional enlarged view for demonstrating the example of the bubble generation | occurrence | production of the label adhesion surface of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Label 2 Periphery smooth surface 3 Central uneven surface 4 Resin molded product 41 Level difference S Label adherence surface

Claims (2)

  In a resin molded product having a label application surface to which labels are attached, the outer periphery of the label application surface within the range of the label application surface is a smooth surface, and the inner region of the label application surface is uneven A resin molded product characterized by being a surface.   2. The resin molded product according to claim 1, wherein the uneven surface of the label-attached surface is an uneven surface by a texture treatment.

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