JP6479420B2 - Resin molded article structure and mold for resin molding - Google Patents
Resin molded article structure and mold for resin molding Download PDFInfo
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- JP6479420B2 JP6479420B2 JP2014224428A JP2014224428A JP6479420B2 JP 6479420 B2 JP6479420 B2 JP 6479420B2 JP 2014224428 A JP2014224428 A JP 2014224428A JP 2014224428 A JP2014224428 A JP 2014224428A JP 6479420 B2 JP6479420 B2 JP 6479420B2
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- 239000011347 resin Substances 0.000 title claims description 82
- 229920005989 resin Polymers 0.000 title claims description 82
- 238000000465 moulding Methods 0.000 title claims description 46
- 239000011248 coating agent Substances 0.000 description 8
- 238000000576 coating method Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000005034 decoration Methods 0.000 description 5
- 230000008602 contraction Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000000452 restraining effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/37—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings
- B29C45/372—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings provided with means for marking or patterning, e.g. numbering articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/40—Removing or ejecting moulded articles
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
この発明は、樹脂成形品構造および樹脂成形用金型に関するものである。 The present invention relates to a resin molded article structure and a resin molding die.
自動車などの車両には、車室内の各部に各種の樹脂成形品が使用されている。このような樹脂成形品には、例えば、インストルメントパネルや、グローブボックスのリッド部や、センターコンソールや、コンソールボックスのリッド部などがある。 In a vehicle such as an automobile, various resin molded products are used in each part of a vehicle interior. Such resin molded articles include, for example, an instrument panel, a lid portion of a glove box, a center console, and a lid portion of a console box.
そして、このような、樹脂成形品は、表面に微細な凹凸状の加飾模様を形成した構造（樹脂成形品構造）を備えている（例えば、特許文献１参照）。 And such a resin molded product is provided with the structure (resin molded product structure) which formed the fine uneven | corrugated decorated pattern on the surface (for example, refer patent document 1).
しかしながら、上記した樹脂成形品構造では、樹脂成形品の表面に、「白モヤ現象」または「白ボケ現象」などと呼ばれる不具合が発生するという問題があった。この「白モヤ現象」は、樹脂成形品に特定の方向から光が当った状態で、樹脂成形品を特定の方向から見た時に、樹脂成形品の表面に、薄白いモヤがかかったような部分的な拡散反射が生じる現象のことである。この「白モヤ現象」については、現在のところ、正確な発生原因がわかっていないため、有効な対策を取ることが困難な状態となっている。 However, in the resin molded article structure described above, there is a problem that a defect called "white haze phenomenon" or "white blur phenomenon" occurs on the surface of the resin molded article. This "white haze phenomenon" is a state in which a resin molded product is exposed to light from a specific direction, and when the resin molded product is viewed from a specific direction, the surface of the resin molded product may have a pale white haze. It is a phenomenon in which partial diffuse reflection occurs. With regard to the "white haze phenomenon", it is difficult to take effective measures because the exact cause of the occurrence is not known at present.
そこで、本発明は、上記した問題点を解決することを、主な目的としている。 Therefore, the main object of the present invention is to solve the above-mentioned problems.
上記課題を解決するために、本発明は、
表面に微細な凹凸状の加飾模様が形成された樹脂成形品を有する樹脂成形品構造であって、
前記樹脂成形品の裏面側に対し、前記加飾模様よりも成形用金型に対する密着性を高くすることで、成形用金型に対する表面側の離型を促進させる裏面側密着用凹凸部を設け、
該裏面側密着用凹凸部は、断面形状が台形状とされると共に、平面形状がハニカム形状とされたことを特徴としている。
In order to solve the above problems, the present invention is
A resin molded article structure having a resin molded article in which a fine uneven decorative pattern is formed on the surface,
By providing the adhesion to the molding die higher than the decorative pattern on the back side of the resin molded product, the back surface side adhesion unevenness is promoted to promote the release of the surface side to the molding die ,
The concave-convex portion for close contact on the back surface side is characterized in that the cross-sectional shape is trapezoidal and the planar shape is honeycomb .
本発明によれば、樹脂成形品の裏面側に裏面側密着用凹凸部を設けるという構成によって、「白モヤ現象」の発生を抑制することができる。
また、裏面側密着用凹凸部の、断面形状を台形状とすると共に、平面形状をハニカム形状とすることにより、裏面側密着用凹凸部の成形用金型に対する密着性を全方向に対して高めることができる。
According to the present invention, the occurrence of the "white haze phenomenon" can be suppressed by the configuration in which the back surface side close contact uneven portion is provided on the back surface side of the resin molded product.
Further, by making the cross-sectional shape of the back surface side contact uneven portion trapezoidal, and making the plane shape into a honeycomb shape, the adhesion of the back surface side contact uneven portion to the molding die is enhanced in all directions. be able to.
以下、本実施の形態を、図面を用いて詳細に説明する。
図１〜図１３は、この実施の形態を説明するためのものである。
Hereinafter, the present embodiment will be described in detail with reference to the drawings.
1 to 13 are for describing this embodiment.
図１に示すように、自動車などの車両１には、車室内の各部に各種の樹脂成形品２が使用されている。このような樹脂成形品２には、例えば、図２に示すようなインストルメントパネル２ａや、グローブボックスのリッド部や、センターコンソールや、コンソールボックスのリッド部などがある。 As shown in FIG. 1, in a vehicle 1 such as a car, various resin molded products 2 are used for each part in a vehicle interior. Such a resin molded product 2 includes, for example, an instrument panel 2a as shown in FIG. 2, a lid portion of a glove box, a center console, a lid portion of a console box, and the like.
そして、このような、樹脂成形品２は、図３に示すように、表面に微細な凹凸状の加飾模様３（例えば、シボ模様）を形成した構造（樹脂成形品構造）を備えている。 And such a resin molded product 2 is equipped with the structure (resin molded product structure) which formed the fine uneven | corrugated decorative pattern 3 (for example, a textured pattern) in the surface, as shown in FIG. .
なお、図２中、符号５はインストルメントパネル２ａの表面に発生する白モヤ部、符号６は太陽光、符号７は視線である。これらについては、後述する。 In FIG. 2, reference numeral 5 is a white haze portion generated on the surface of the instrument panel 2 a, reference numeral 6 is sunlight, and reference numeral 7 is a line of sight. These will be described later.
以上のような基本的な構成に対し、この実施例では、以下のような構成を備えるようにしている。 In contrast to the basic configuration as described above, in this embodiment, the following configuration is provided.
（１）図４の断面図（および図５、図６の部分拡大図）に示すように、上記樹脂成形品２の裏面側に対し、上記加飾模様３よりも成形用金型１３（図７参照）に対する裏面側の密着性を高くすることで、図８に示すように、成形用金型１３に対する表面側の離型を促進させる裏面側密着用凹凸部１４を設ける。 (1) As shown in the cross-sectional view of FIG. 4 (and partially enlarged views of FIG. 5 and FIG. 6), the molding die 13 (see FIG. By increasing the adhesion on the back surface side with respect to 7), as shown in FIG. 8, the back surface side adhesion uneven portion 14 is provided which promotes the release of the front surface side to the molding die 13.
なお、成形用金型１３および裏面側密着用凹凸部１４の詳細については、後述する。 The details of the molding die 13 and the back surface side contact uneven portion 14 will be described later.
（２）図５および図６に示すように、上記裏面側密着用凹凸部１４の、樹脂成形品２の裏面に対する上記傾斜角度１２（図６参照）を、上記加飾模様３の樹脂成形品２の表面に対する傾斜角度１１（図５参照）よりも大きくする（傾斜角度１２＞傾斜角度１１）。 (2) As shown in FIG. 5 and FIG. 6, the inclined angle 12 (see FIG. 6) of the uneven portion 14 for close contact on the back side with respect to the back side of the resin molded article 2 Make the inclination angle 11 (see FIG. 5) relative to the surface of 2 larger (inclination angle 12> inclination angle 11).
ここで、加飾模様３の、樹脂成形品２の表面に対する傾斜角度１１は、加飾模様３の１山についての平均角度のことである。また、裏面側密着用凹凸部１４の、樹脂成形品２の裏面に対する傾斜角度１２は、図９に示すような裏面側密着用凹凸部１４の１山についての（側面部分１４ａの）平均角度のことである。この場合、裏面側密着用凹凸部１４は、ほぼ台形状と見なせる断面形状を有するものなどとなっている。なお、平均角度としているのは、加飾模様３や裏面側密着用凹凸部１４（の側面部分１４ａ）が、直線的な傾斜面になっているとは限らないからである。 Here, the inclination angle 11 of the decorative pattern 3 with respect to the surface of the resin molded product 2 is the average angle of one decorative pattern 3 peak. In addition, the inclination angle 12 of the back surface side adhesion uneven portion 14 with respect to the back surface of the resin molded product 2 is an average angle (of the side surface portion 14a) of one peak of the back surface side adhesion uneven portion 14 as shown in FIG. It is. In this case, the back surface side contact uneven portion 14 has a cross-sectional shape that can be regarded as substantially trapezoidal. The average angle is used because the decorative pattern 3 and the back surface side contact uneven portion 14 (the side portion 14a thereof) are not necessarily linearly inclined.
より具体的な角度について説明すると、加飾模様３は、一般にエッチングなどの工法によって形成されるため、厳密に規定した角度に揃ったものにはならず、その傾斜角度１１は、おおむね１５°〜３５°程度の範囲内である程度のバラ付きを持って形成されることになる。そして、裏面側密着用凹凸部１４の傾斜角度１２は、上記した加飾模様３の傾斜角度１１よりも確実に大きくする必要がある。そのために、裏面側密着用凹凸部１４の傾斜角度１２は、３０°〜９０°、好ましくは、３０°〜７０°程度の範囲内に設定する。なお、裏面側密着用凹凸部１４の傾斜角度１２が９０°よりも大きくなると、型抜き上の問題などが生じて成形不良を起こし易くなるので、上限については９０°までとする。 More specifically, since the decorative pattern 3 is generally formed by a method such as etching, it does not conform to the strictly defined angle, and the inclination angle 11 thereof is approximately 15 ° to It will be formed with a certain degree of variation within the range of about 35 °. And it is necessary to make certainly inclination angle 12 of concavo-convex part 14 for back side contact more certainly than inclination angle 11 of above-mentioned decoration pattern 3. For this purpose, the inclination angle 12 of the back surface side contact uneven portion 14 is set within a range of about 30 ° to 90 °, preferably about 30 ° to 70 °. If the inclination angle 12 of the back surface side intimate contact uneven portion 14 is larger than 90 °, problems such as die removal may occur to easily cause molding defects. Therefore, the upper limit is set to 90 °.
そして、樹脂成形品２の全体形状について説明すると、仮に、樹脂成形品２が、平坦面のみによって構成されたものである場合には、加飾模様３の傾斜角度１１は全体に亘ってほぼ一定となるので、裏面側密着用凹凸部１４の傾斜角度１２も全体に亘ってほぼ一定に設定すれば良い。 And if the resin molded product 2 is comprised by only the flat surface if the resin molded product 2 is comprised only by the flat surface, if the resin molded product 2 whole shape is demonstrated, the inclination angle 11 of the decoration pattern 3 will be substantially constant over the whole. Therefore, the inclination angle 12 of the back surface side contact uneven portion 14 may be set to be substantially constant over the whole.
これに対し、樹脂成形品２が自由曲面となっている場合には、加飾模様３の傾斜角度１１は大雑把に言うと部位によってそれぞれ異なったものとなるので、裏面側密着用凹凸部１４の傾斜角度１２も上記した各部位ごとに分けてそれぞれ最適に設定する必要が生じる。この場合、裏面側密着用凹凸部１４の部位ごとの傾斜角度１２の設定は、加飾模様３の各部位ごとの傾斜角度１１の平均値または最大値よりも大きくなるようにする。なお、車両１に用いられる上記樹脂成形品２は、自由曲面となっているのが普通であるため、大部分が後者のケース（即ち、部位ごとに傾斜角度１２を設定するもの）となる。なお、型抜き上の問題が発生しない範囲であれば、一定の傾斜角度とすることも可能である。 On the other hand, when the resin molded product 2 is a free-form surface, the inclination angle 11 of the decoration pattern 3 is roughly different depending on the part, so the back surface side adhesion uneven portion 14 The inclination angle 12 also needs to be set optimally for each of the parts described above. In this case, the setting of the inclination angle 12 for each part of the back surface side contact uneven part 14 is made larger than the average value or the maximum value of the inclination angles 11 for each part of the decorative pattern 3. In addition, since the resin molded product 2 used for the vehicle 1 is usually a free curved surface, most of the resin molded products 2 are the latter case (that is, the one in which the inclination angle 12 is set for each part). In addition, if it is a range which does not generate | occur | produce the problem on mold removal, it is also possible to set it as a fixed inclination angle.
（３）図１０に示すように、上記裏面側密着用凹凸部１４の平面形状（樹脂成形品２の裏面側から見た形状）を、ハニカム形状とする（ハニカム状凹凸部３１）。 (3) As shown in FIG. 10, the planar shape (the shape viewed from the back surface side of the resin molded product 2) of the back surface side contact uneven portion 14 is made into a honeycomb shape (honeycomb-shaped uneven portion 31).
ここで、裏面側密着用凹凸部１４の平面形状は、ハニカム形状とする以外にも、図１１に示すような直角格子形状や、図１２に示すような傾斜格子形状などとしても良い（格子状凹凸部３２，３３）。但し、ハニカム形状とすると、より効果的である。 Here, in addition to the honeycomb shape, the planar shape of the back surface side adhesion uneven portion 14 may be a rectangular lattice shape as shown in FIG. 11 or an inclined lattice shape as shown in FIG. Uneven parts 32, 33). However, the honeycomb shape is more effective.
（４）上記樹脂成形品２は、図７に示すような樹脂成形用金型（成形用金型１３）によって成形される。
この成形用金型１３は、加飾模様３を形成するための凹凸部４１ａを有するキャビティ型４１と、裏面側密着用凹凸部１４を形成するための凹凸部４２ａを有するコア型４２とを、両者間に所要の成形空間４３を有して、互いに近接離反動可能に対向配置したものとする。但し、キャビティ型４１とコア型４２とは逆であっても良い。
(4) The resin molded product 2 is molded by a resin molding die (molding die 13) as shown in FIG.
The molding die 13 has a cavity mold 41 having a concavo-convex portion 41 a for forming the decorative pattern 3 and a core mold 42 having a concavo-convex portion 42 a for forming the concavo-convex portion 14 for close contact on the back side. A required forming space 43 is provided between the two, and they are disposed facing each other so as to be able to move close to and away from each other. However, the cavity mold 41 and the core mold 42 may be reversed.
（５）上記樹脂成形品２の成形方法（樹脂成形方法）は以下の通りである。 (5) The molding method (resin molding method) of the resin molded product 2 is as follows.
即ち、キャビティ型４１とコア型４２とを近接させて型締めを行い（型締工程）、キャビティ型４１とコア型４２との間に形成される成形空間４３に溶融樹脂５１を注入し（注入工程）、その後、所要の圧力（保圧力）で所要時間保持しつつ（保圧工程）、キャビティ型４１とコア型４２とを冷却して溶融樹脂５１を固化させ（冷却工程）、溶融樹脂５１が固化されたら、図８に示すように、キャビティ型４１とコア型４２とを開いて樹脂成形品２を取り出すようにする（型開工程および製品取出工程）。 That is, the cavity mold 41 and the core mold 42 are brought close to each other to perform mold clamping (mold clamping process), and the molten resin 51 is injected into the molding space 43 formed between the cavity mold 41 and the core mold 42 (injection Step), and then holding the required pressure (holding pressure) for a required time (holding pressure step), cooling the cavity mold 41 and the core mold 42 to solidify the molten resin 51 (cooling step); After solidification, as shown in FIG. 8, the cavity mold 41 and the core mold 42 are opened to take out the resin molded product 2 (mold opening process and product taking-out process).
＜作用効果＞この実施例によれば、以下のような作用効果を得ることができる。 <Operation and Effect> According to this embodiment, the following operation and effect can be obtained.
（１）車両１の内装などに用いられる樹脂成形品構造は、樹脂成形品２の表面に微細な凹凸状の加飾模様３を有している。このように、樹脂成形品２の表面に微細な凹凸状の加飾模様３を形成することにより、樹脂成形品２の表面に皮革模様や幾何学模様などの表面意匠を施すと共に、樹脂素材特有の表面光沢を抑えて樹脂成形品２の質感を高めることができる。 (1) The resin molded product structure used for the interior of the vehicle 1 has a finely uneven decorative pattern 3 on the surface of the resin molded product 2. As described above, by forming the fine uneven decorative pattern 3 on the surface of the resin molded product 2, the surface design such as a leather pattern or a geometric pattern is provided on the surface of the resin molded product 2, and The surface gloss of the resin molded product 2 can be enhanced by suppressing the surface gloss of the resin molded product 2.
上記した樹脂成形品構造では、樹脂成形品２の表面に、「白モヤ現象」または「白ボケ現象」などと呼ばれる不具合が発生している（白モヤ部５）。この「白モヤ現象」は、図１に示すように、樹脂成形品２に特定の方向から光（例えば、太陽光６）が当った状態で、樹脂成形品２を特定の方向から見た（視線７）時に、樹脂成形品２の表面に、薄白いモヤがかかったような部分的な拡散反射が生じる現象のことである。この「白モヤ現象」については、現在のところ、正確な発生原因がわかっていないため、有効な対策を取ることが困難な状態となっている。 In the resin molded article structure described above, a defect called "white haze phenomenon" or "white blur phenomenon" has occurred on the surface of the resin molded article 2 (white haze part 5). This "white haze phenomenon" is, as shown in FIG. 1, the resin molded product 2 seen from a specific direction in a state where light (for example, sunlight 6) is applied to the resin molded product 2 from a specific direction ( At the time of the line of sight 7), it is a phenomenon in which a partial diffuse reflection such as a thin white haze occurs on the surface of the resin molded product 2. With regard to the "white haze phenomenon", it is difficult to take effective measures because the exact cause of the occurrence is not known at present.
これに対し、本願発明者は、（裏面側密着用凹凸部１４がない場合には）図１３に示すように、成形用金型１３からの脱型時に、微細な凹凸状の加飾模様３が成形用金型１３（のキャビティ型４１に形成された凹凸部４１ａ）と擦れることによって（図１３（ｃ）の擦れ部５５参照）、加飾模様３に計測器では捉えられないような極めて僅かな変形が生じ、一定の条件が成立した時に、この極めて僅かな変形が光を拡散反射させることによって上記した「白モヤ現象」が引き起こされるのではないかという仮説を立てた。即ち、この仮説は、微視的に見た場合に、図１３（ａ）の成形が終了した状態から図１３（ｂ）のように成形用金型１３を開くと、樹脂成形品２は、裏面側から（コア型４２に対する）離型が始まり（離型部５６）、離型によって成形用金型１３（のコア型４２）から開放された部分に、成形用金型１３内での冷却による樹脂の収縮が生じ（収縮部５７）、この収縮によって表面側が（キャビティ型４１から遅れて）離型する時に、図１３（ｃ）に示すように、加飾模様３が成形用金型１３（のキャビティ型４１に形成された凹凸部４１ａ）と擦れて（擦れ部５５）、加飾模様３に上記したような極めて僅かな変形が発生するのではないか、というものである。 On the other hand, as shown in FIG. 13 (in the case where there is no uneven portion 14 for close contact on the back side), the inventor of the present invention displayed a finely uneven decorative pattern 3 at the time of mold removal from the molding die 13. 13 by rubbing against the molding die 13 (the uneven portion 41a formed on the cavity mold 41) (see the rubbed portion 55 in FIG. 13C), the decorative pattern 3 can not be caught by the measuring instrument. A slight deformation occurred, and it was hypothesized that this very slight deformation may cause the above-mentioned "white haze phenomenon" by diffuse reflection of light when a certain condition is satisfied. That is, when viewed microscopically, when the molding die 13 is opened as shown in FIG. 13 (b) from the state where the molding in FIG. 13 (a) is finished, the resin molded product 2 is The mold release from the back surface side (with respect to the core mold 42) starts (mold release part 56), and the part opened from (the core mold 42 of) the mold 13 by mold release is cooled in the mold 13 As shown in FIG. 13 (c), when the surface side is released (retarded from the cavity mold 41) due to shrinkage of the resin due to the shrinkage (shrinkage portion 57), as shown in FIG. It is said that the very slight deformation as described above may occur in the decorative pattern 3 by rubbing with (the uneven portion 41a formed in the cavity mold 41) (the rubbed portion 55).
そして、「白モヤ現象」が発生した場合、「白モヤ現象」を隠すために本来必要のない塗装（タッチアップ塗装）や成形用金型１３の修正などを行わなければならなくなるので、環境への負担が増大し、また、塗装コストや金型コストが発生することになる。更に、塗装や成形用金型１３の修正により、樹脂成形品２の製造に工期や製造コストが掛かることになる。 Then, when the "white haze phenomenon" occurs, it is not necessary to perform coating (touch-up coating) which is not originally necessary to hide the "white haze phenomenon", correction of the molding die 13, etc. This will increase the burden of coating, and will incur coating costs and mold costs. Furthermore, due to the modification of the coating or molding die 13, the construction period and the manufacturing cost will be required to manufacture the resin molded product 2.
そこで、上記したように、樹脂成形品２の裏面側に対し、加飾模様３よりも成形用金型１３に対する密着性が高い裏面側密着用凹凸部１４を設けるようにした（図６参照）。そして、この裏面側密着用凹凸部１４によって、成形用金型１３内での冷却による樹脂の収縮力を成形用金型１３への拘束力に変換し、成形用金型１３に対する表面側の離型を促進させるようにした。その結果、上記したような、脱型時の樹脂の収縮による加飾模様３と成形用金型１３との擦れが緩和され、上記したような加飾模様３の極めて僅かな変形が抑えられて、「白モヤ現象」の発生が抑制されることが実際に確認された。即ち、「白モヤ現象」に対して有効な対策を得ることができた。 Therefore, as described above, on the back surface side of the resin molded product 2, the back surface side adhesion uneven portion 14 having higher adhesion to the molding die 13 than the decorative pattern 3 is provided (see FIG. 6). . Then, the contraction force of the resin due to cooling in the molding die 13 is converted into a restraining force to the molding die 13 by the back-surface-side close-contacting concavo-convex portion 14, and the surface side of the molding die 13 is separated I tried to promote the type. As a result, the friction between the decorative pattern 3 and the molding die 13 due to the shrinkage of the resin as described above is alleviated, and the extremely slight deformation of the decorative pattern 3 as described above is suppressed. It was actually confirmed that the occurrence of the "white haze phenomenon" was suppressed. That is, it was possible to obtain an effective measure against the "white haze phenomenon".
以って、「白モヤ現象」を隠すための塗装をなくし、製品の無塗装化を図って、環境への負担を抑えたり塗装コストを抑えたりすることができるようになる。また、樹脂成形品２の裏面側に対して、成形用金型１３内での冷却による樹脂の収縮力を成形用金型１３への拘束力に変換させるための裏面側密着用凹凸部１４を設けるだけなので、裏面側密着用凹凸部１４は、表面側の加飾模様３よりも加工が容易である。 Therefore, it is possible to eliminate the coating for hiding the "white haze phenomenon" and to make the product non-painting, thereby reducing the burden on the environment and the coating cost. In addition, on the back surface side of the resin molded product 2, the back surface side adhesion uneven portion 14 for converting the contraction force of the resin due to cooling in the molding die 13 into a restraining force to the molding die 13 is Since it is only provided, the back surface side contact uneven portion 14 is easier to process than the decorative pattern 3 on the front surface side.
また、「白モヤ現象」を抑制するのに、上記した引用文献の場合には、使用する樹脂材料に制限が生じ、表面側の加飾模様３と裏面側密着用凹凸部１４との間で表面粗度や表面積の関係を厳密に調整する必要があるのに対し、本願発明の場合には、使用する樹脂材料による制限を受けることがなく、表面側の加飾模様３と裏面側密着用凹凸部１４との間で表面粗度や表面積の関係を厳密に調整したりする必要もないので、構成が簡単である。しかも、塗装や成形用金型１３の修正を無くした分だけ、樹脂成形品２を製造する工期を短縮したり、製造コストを抑えたりすることができるようになる。 Moreover, in the case of the cited reference mentioned above, in order to suppress the "white haze phenomenon", a restriction | limiting arises in the resin material to be used, and between the decoration pattern 3 on the surface side and the uneven part 14 for close contact on the back side. While it is necessary to strictly adjust the relationship between the surface roughness and the surface area, in the case of the present invention, there is no limitation by the resin material to be used, and for the decorative pattern 3 on the front side and the back side adhesion. The structure is simple because it is not necessary to strictly adjust the relationship between the surface roughness and the surface area with the concavo-convex portion 14. In addition, it is possible to shorten the working period for manufacturing the resin molded product 2 and to reduce the manufacturing cost by the amount of elimination of the correction of the coating and the molding die 13.
（２）図５および図６に示すように、裏面側密着用凹凸部１４の、樹脂成形品２の裏面に対する傾斜角度１２を、加飾模様３の、樹脂成形品２の表面に対する傾斜角度１１よりも大きくした。これにより、成形用金型１３内での樹脂成形品２を構成する樹脂の収縮力を確実に成形用金型１３への拘束力に変換させることができるので（即ち、裏面側密着用凹凸部１４が成形用金型１３（コア型４２）から離れようとする方向の分力を、加飾模様３が成形用金型１３（キャビティ型４１）から離れようとする方向の分力よりも小さくすることができるので）、裏面側密着用凹凸部１４の成形用金型１３に対する密着性をより高めて、成形用金型１３に対する樹脂成形品２の表面側の離型を一層促進することができる。その結果、「白モヤ現象」の発生をより有効に防止することができるようになる。 (2) As shown in FIG. 5 and FIG. 6, the inclination angle 12 of the back surface side contact uneven portion 14 with respect to the back surface of the resin molded product 2 is the inclination angle 11 of the decorative pattern 3 with respect to the surface of the resin molded product 2 It was bigger than that. Thereby, the contraction force of the resin constituting the resin molded product 2 in the molding die 13 can be reliably converted into a restraining force to the molding die 13 (that is, the uneven portion for close contact on the back side) The component force in the direction in which 14 separates from the molding die 13 (core die 42) is smaller than the component force in the direction in which the decorative pattern 3 separates from the molding die 13 (cavity die 41) Can further enhance the adhesion of the back surface side adhesion uneven portion 14 to the molding die 13 to further promote the release of the surface side of the resin molded product 2 to the molding die 13. it can. As a result, the occurrence of the "white haze phenomenon" can be more effectively prevented.
（３）図１０に示すように、裏面側密着用凹凸部１４の平面形状をハニカム形状とした（ハニカム状凹凸部３１）。ハニカム形状は、等方性を有する形状であるので、裏面側密着用凹凸部１４の成形用金型１３に対する密着性を全方向に対して高めることができる。その結果、どのような方向から見た場合でも、「白モヤ現象」が発生しないようにすることが可能となる。また、裏面側密着用凹凸部１４をハニカム形状とすることにより、成形用金型１３（コア型４２）に対するアンカー効果や、樹脂成形品２を構成する樹脂の全面に亘る収縮の均等化なども期待することができる。 (3) As shown in FIG. 10, the planar shape of the back surface side contact uneven portion 14 is formed into a honeycomb shape (honeycomb-like uneven portion 31). Since the honeycomb shape is a shape having isotropy, the adhesion of the back surface side contact uneven portion 14 to the molding die 13 can be enhanced in all directions. As a result, it is possible to prevent the occurrence of the "white haze phenomenon" when viewed from any direction. In addition, by forming the back surface side adhesion uneven portion 14 in a honeycomb shape, an anchor effect on the molding die 13 (core die 42), equalization of contraction over the entire surface of the resin forming the resin molded product 2, etc. You can expect.
（４）加飾模様３を形成するための凹凸部４１ａを有するキャビティ型４１（またはコア型）と、裏面側密着用凹凸部１４を形成するための凹凸部４２ａを有するコア型４２（またはキャビティ型）と、を有する成形用金型１３を用いることにより、「白モヤ現象」の発生が抑制された樹脂成形品２を成形することができる。 (4) A core mold 42 (or a cavity having a cavity type 41 (or core type) having the concavo-convex portion 41a for forming the decorative pattern 3 and a concavo-convex portion 42a for forming the concavo-convex portion 14 for close contact on the back side. By using the molding die 13 having a mold, it is possible to mold the resin molded product 2 in which the occurrence of the "white haze phenomenon" is suppressed.
以上、この発明の実施例を図面により詳述してきたが、実施例はこの発明の例示にしか過ぎないものである。よって、この発明は実施例の構成にのみ限定されるものではなく、この発明の要旨を逸脱しない範囲の設計の変更等があってもこの発明に含まれることは勿論である。また、例えば、各実施例に複数の構成が含まれている場合には、特に記載がなくとも、これらの構成の可能な組合せが含まれることは勿論である。また、複数の実施例や変形例がこの発明のものとして開示されている場合には、特に記載がなくとも、これらに跨がった構成の組合せのうちの可能なものが含まれることは勿論である。また、図面に描かれている構成については、特に記載がなくとも、含まれることは勿論である。更に、「等」の用語がある場合には、同等のものを含むという意味で用いられている。また、「ほぼ」「約」「程度」などの用語がある場合には、常識的に認められる範囲や精度のものを含むという意味で用いられている。 While the embodiments of the present invention have been described in detail with reference to the drawings, the embodiments are merely illustrative of the present invention. Therefore, the present invention is not limited only to the configuration of the embodiment, and it is a matter of course that the present invention is included in the present invention even if there are changes in design and the like within the scope of the present invention. Further, for example, in the case where each embodiment includes a plurality of configurations, it goes without saying that possible combinations of these configurations are included even if there is no particular description. Further, in the case where a plurality of examples and modifications are disclosed as the present invention, it goes without saying that possible combinations of configurations across these are included even if there is no particular description. It is. Further, it goes without saying that the configuration depicted in the drawings is included even if there is no particular description. Furthermore, the term "etc" is used in the sense that it includes the equivalent. Moreover, when there is a term such as "approximately", "about", "degree", etc., it is used in the sense that it includes the range and accuracy that are accepted as common sense.
２ 樹脂成形品
３ 加飾模様
１１ 傾斜角度
１２ 傾斜角度
１３ 成形用金型
１４ 裏面側密着用凹凸部
３１ ハニカム状凹凸部
４１ キャビティ型
４１ａ 凹凸部
４２ コア型
４２ａ 凹凸部
４３ 成形空間
Reference Signs List 2 resin molded product 3 decoration pattern 11 inclination angle 12 inclination angle 13 molding die 14 back surface side contact uneven portion 31 honeycomb shaped uneven portion 41 cavity type 41 a uneven portion 42 core type 42 a uneven portion 43 molding space
Claims (3)
前記樹脂成形品の裏面側に対し、前記加飾模様よりも成形用金型に対する密着性を高くすることで、成形用金型に対する表面側の離型を促進させる裏面側密着用凹凸部を設け、
該裏面側密着用凹凸部は、断面形状が台形状とされると共に、平面形状がハニカム形状とされたことを特徴とする樹脂成形品構造。 A resin molded article structure having a resin molded article in which a fine uneven decorative pattern is formed on the surface,
By providing the adhesion to the molding die higher than the decorative pattern on the back side of the resin molded product, the back surface side adhesion unevenness is promoted to promote the release of the surface side to the molding die. ,
A resin molded article structure characterized in that the back surface-side close-contacting concavo-convex portion has a trapezoidal cross-sectional shape and a planar shape of a honeycomb shape .
前記裏面側密着用凹凸部の、樹脂成形品の裏面に対する前記傾斜角度が、前記加飾模様の、樹脂成形品の表面に対する傾斜角度よりも大きいことを特徴とする樹脂成形品構造。 The resin molded article structure according to claim 1, wherein
A resin molded product structure characterized in that the inclination angle of the back surface side close contact indented portion with respect to the back surface of the resin molded product is larger than the inclination angle of the decorative pattern with respect to the surface of the resin molded product.
加飾模様を形成するための凹凸部を有するキャビティ型またはコア型と、裏面側密着用凹凸部を形成するための凹凸部を有するコア型またはキャビティ型と、を備えたことを特徴とする樹脂成形用金型。 A resin molding die used for molding the resin molded article according to claim 1 or 2 ,
A resin comprising: a cavity type or core type having asperities to form a decorative pattern; and a core type or cavity type having asperities to form back side close contact asperities Mold for molding.
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