JP2000343535A - Preparation of resin product - Google Patents
Preparation of resin productInfo
- Publication number
- JP2000343535A JP2000343535A JP16038299A JP16038299A JP2000343535A JP 2000343535 A JP2000343535 A JP 2000343535A JP 16038299 A JP16038299 A JP 16038299A JP 16038299 A JP16038299 A JP 16038299A JP 2000343535 A JP2000343535 A JP 2000343535A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- resin
- opening
- resin material
- female
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229920005989 resin Polymers 0.000 title claims abstract description 58
- 239000011347 resin Substances 0.000 title claims abstract description 58
- 238000002360 preparation method Methods 0.000 title abstract 2
- 238000000465 moulding Methods 0.000 claims abstract description 41
- 239000000463 material Substances 0.000 claims abstract description 29
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000009434 installation Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 13
- 239000002928 artificial marble Substances 0.000 description 9
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000002344 surface layer Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229920006337 unsaturated polyester resin Polymers 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、雄型と雌型との間
の成形空間に樹脂材料を注入してこれを加熱硬化させ、
製品を得るようにした樹脂製品の製造方法に関するもの
である。BACKGROUND OF THE INVENTION The present invention relates to a resin material injected into a molding space between a male mold and a female mold, which is cured by heating.
The present invention relates to a method for producing a resin product for obtaining a product.
【０００２】[0002]
【従来の技術】不飽和ポリエステル樹脂又はアクリル樹
脂を主原料とし、これにフリット等を加えた樹脂材料
（レジンコンクリート）を、雄型と雌型との間の成形空
間に充填し、加熱硬化させて人造大理石浴槽等の樹脂製
品を製造する場合、通常は図３に示すような方法で行っ
ている。先ず、同図の図（Ａ）に示すように、雌型１の
成形面である凹部２に、製品の裏面の補強層を形成する
ためのプリプレグされたプリゲルシート３と、液状のレ
ジンコンクリート（以下は、単にレジコンという）４を
装入及び流し込み準備する。一方、雄型５の成形面であ
る凸部６の表面に、ゲルコート層７と、透明な表面層８
とを吹き付けにより形成している。そして、これらの雄
型５の全体を雌型１に被せ、図３の図（Ｃ）に示すよう
に、雌雄型１及び５の全体を反転させ、この状態で加熱
硬化させている。全体を反転させるのは、成形空間９内
の樹脂材料に含まれる気泡を製品（人造大理石浴槽）１
０の底部裏面へ集合させるためである。2. Description of the Related Art A resin material (resin concrete) containing an unsaturated polyester resin or an acrylic resin as a main raw material and a frit added thereto is filled in a molding space between a male mold and a female mold, and is cured by heating. When a resin product such as an artificial marble bath is manufactured by using a conventional method, the method is usually performed as shown in FIG. First, as shown in FIG. 1A, a prepreg sheet 3 for forming a reinforcing layer on the back surface of a product is formed in a concave portion 2 which is a molding surface of a female mold 1 and a liquid resin concrete ( The following will be simply referred to as a cash register) 4 and prepared for charging and pouring. On the other hand, a gel coat layer 7 and a transparent surface layer 8 are formed on the surface of the convex portion 6 which is the molding surface of the male mold 5.
Are formed by spraying. Then, the entirety of the male molds 5 is placed on the female mold 1, and as shown in FIG. 3 (C), the entirety of the male and female molds 1 and 5 is turned over, and is heated and cured in this state. The reason for inverting the whole is that bubbles contained in the resin material in the molding space 9 are converted into products (artificial marble bathtub) 1.
This is for assembling on the bottom rear surface of the zero.
【０００３】ところが、このような樹脂製品の製造方法
では、硬化中の樹脂材料が膨張するために、雌雄型１及
び５の全体が図４の図（Ａ）の状態から図（Ｂ）の状態
に変化し、樹脂製品１０の隅角部１０ａの肉厚が薄くな
り、該部分のみが裏面側まで透けて見えたり、色調が他
の部分と異なるという欠点があった。また樹脂材料が不
足すると、未充填となり、空気が残ったり、色調が均一
でなくなるという欠点があった。However, in such a method of manufacturing a resin product, the entirety of the male and female molds 1 and 5 is changed from the state of FIG. 4A to the state of FIG. And the thickness of the corner portion 10a of the resin product 10 becomes thinner, and only this portion is seen through to the back surface side, and the color tone is different from other portions. Further, if the resin material is insufficient, the resin material is not filled, and there is a problem that air remains and the color tone is not uniform.
【０００４】そのため、従来では、樹脂材料の硬化によ
る膨張を抑制するために、図５に示すような剛性の高い
成形型１１を使用するようにしていた。図５の成形型１
１は、雄型５をアルミ合金製の金型とし、雌型１をＦＲ
Ｐで成形した樹脂型としたものである。樹脂材料は、雌
型１の浴槽上縁面に対応する位置に注入口１２を開口
し、該注入口１２から注入装置１３を用いて加圧注入す
るようにしている。Therefore, conventionally, a rigid mold 11 as shown in FIG. 5 has been used in order to suppress expansion due to curing of a resin material. Mold 1 of FIG.
1, the male mold 5 is an aluminum alloy mold, and the female mold 1 is FR.
This is a resin mold molded with P. An injection port 12 is opened at a position corresponding to the upper edge surface of the bathtub of the female mold 1, and the resin material is injected under pressure from the injection port 12 using an injection device 13.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、図５に
示す剛性の高い成形型１１の場合は、金型を含むもので
あるため、全体の重量が重くなり、専用の型合わせ機や
脱型機を必要とし、設備全体が大型化するという欠点が
あった。また成形型１１が複数配置されている場合に、
雌雄型１及び５のそれぞれの組み合わせが変わると、樹
脂材料の充填不良が発生することもあるという欠点があ
った。However, in the case of the molding die 11 having high rigidity shown in FIG. 5, since the molding die 11 includes a die, the whole weight becomes heavy, and a dedicated mold matching machine and a demolding machine are required. However, there is a disadvantage that the entire equipment becomes large. When a plurality of molds 11 are arranged,
When the respective combinations of the male and female molds 1 and 5 change, there is a drawback that the filling of the resin material may be insufficient.
【０００６】[0006]
【課題を解決するための手段】本発明は従来の前記課題
に鑑みてこれを改良除去したものであって、成形型を簡
略化でき、また樹脂材料の充填も確実に行える製造方法
を提供せんとするものである。SUMMARY OF THE INVENTION The present invention has been improved and eliminated in view of the above-mentioned problems, and does not provide a manufacturing method capable of simplifying a molding die and reliably filling a resin material. It is assumed that.
【０００７】而して、前記課題を解決するために本発明
が採用した請求項１の手段は、雄型の上に雌型を被せて
成形空間を形成し、雌型の上面側に開口部を設け、この
開口部から前記成形空間へ樹脂材料を注入し、樹脂材料
の自重により成形空間へ流動させ、樹脂材料が前記開口
部の高さまで達したとき、開口面の露出面に補強層を設
けて硬化させるようにしたことを特徴とする樹脂製品の
製造方法である。雌型の上面側に設けた開口部から樹脂
材料を充填しており、均一な充E易である。更に、型合
わせや脱型等も手作業で行うことができ、大型の設備は
不要である。According to the first aspect of the present invention, a female mold is placed on a male mold to form a molding space, and an opening is formed on the upper surface of the female mold. Is provided, the resin material is injected into the molding space from the opening, and flows into the molding space by its own weight, and when the resin material reaches the height of the opening, a reinforcing layer is formed on the exposed surface of the opening. A method for producing a resin product, wherein the resin product is provided and cured. The resin material is filled from the opening provided on the upper surface side of the female mold, and uniform filling is easy. Furthermore, mold matching and demolding can be performed manually, and large equipment is not required.
【０００８】本発明が採用した請求項２の手段は、硬化
前に開口部を蓋で覆うようにした前記請求項１に記載の
樹脂製品の製造方法である。開口部の高さまで樹脂材料
を充填した後、当該開口部を蓋で覆うようにしており、
樹脂製品の肉厚を均一に成形することができる。According to a second aspect of the present invention, there is provided the resin product manufacturing method according to the first aspect, wherein the opening is covered with a lid before curing. After filling the resin material to the height of the opening, the opening is covered with a lid,
The thickness of the resin product can be formed uniformly.
【０００９】本発明が採用した請求項３の手段は、前記
開口部が成形品の全領域に及んでいる請求項１に記載の
樹脂製品の製造方法である。この場合も樹脂材料の充填
を均一厚みで行うことができ、樹脂製品の肉厚を均一に
することが可能である。According to a third aspect of the present invention, there is provided the resin product manufacturing method according to the first aspect, wherein the opening extends over the entire area of the molded product. Also in this case, the resin material can be filled with a uniform thickness, and the thickness of the resin product can be made uniform.
【００１０】[0010]
【発明の実施の形態】以下に、本発明の構成を図面に示
す発明の実施の形態に基づいて説明すると次の通りであ
る。なお、従来の場合と同一符号は同一部材である。図
１は本発明の第１の実施の形態に係る成形型１４を示す
縦断面図である。同図に示す如く、この成形型１４は人
造大理石浴槽１０を成形する場合のものであり、台車１
５上に雄型１６が載置されている。これは、各作業ステ
ーション間の移動を容易にするためである。そして、雄
型１６に雌型１７を被せ、その周縁の数カ所を万力等の
クランプ装置１８でクランプしている。雌型１７の上面
側（人造大理石浴槽１０の底壁外周面を成形するための
部分）には、開口部１９と、空気抜き孔２０が形成され
ている。開口部１９は、例えば、３００×４００ｍｍの
矩形状をなすものであり、また空気抜き孔２０は、製品
である浴槽１０の排水口部に対応した位置に形成されて
いる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below with reference to the embodiments of the invention shown in the drawings. The same reference numerals as those in the conventional case denote the same members. FIG. 1 is a longitudinal sectional view showing a molding die 14 according to the first embodiment of the present invention. As shown in the figure, this molding die 14 is for molding the artificial marble bathtub 10 and the bogie 1
The male mold 16 is placed on the top 5. This is to facilitate movement between the work stations. Then, the female die 17 is put on the male die 16 and several places around its periphery are clamped by a clamp device 18 such as a vise. An opening 19 and an air vent hole 20 are formed on the upper surface side of the female die 17 (portion for forming the outer peripheral surface of the bottom wall of the artificial marble bathtub 10). The opening 19 has a rectangular shape of, for example, 300 × 400 mm, and the air vent hole 20 is formed at a position corresponding to a drain port of the bathtub 10 as a product.
【００１１】次に、成形型１４による人造大理石浴槽１
０の製造方法を説明する。先ず、台車１５上の雄型１６
の成形面に、ゲルコート層としてのプリプレグされたプ
リゲルシートと、透明な表面層としてのプリプレグされ
たプリゲルシートとを被せると共に、雌型１７の成形面
に、製品の裏面の補強層を形成するためのプリプレグさ
れたプリゲルシートを装入する。そして、雄型１６に雌
型１５を被せ、これらをクランプ装置１８でクランプす
る。Next, the artificial marble bathtub 1 with the molding die 14 is used.
0 will be described. First, the male mold 16 on the cart 15
In order to form a prepreg sheet as a gel coat layer and a prepreg sheet as a transparent surface layer on the molding surface of the above, and to form a reinforcing layer on the back surface of the product on the molding surface of the female mold 17. The prepreg sheet is charged. Then, the female die 15 is put on the male die 16 and these are clamped by the clamp device 18.
【００１２】次に、開口部１９から樹脂材料のレジコン
を注入する。注入されたレジコンは、雌雄型１５及び１
６の間の成形空間２１内を隅々まで流動し、気泡を上方
へ押し上げながら下方から順に充満され、やがて開口部
１９に至るようになる。成形空間２１内の気泡は、開口
部１９及び空気抜き孔２０から外部へ排出される。レジ
コンの注入は、開口部１９の底面の高さまで行う。これ
により、人造大理石浴槽１０の底壁の肉厚を均一にする
ことが可能である。然る後は、補強層としてのプリプレ
グされたプリゲルシート３を下面側に配設したＦＲＰ製
の蓋２２を準備し、前記開口部１９を閉塞する。そし
て、そのままの状態でレジコンを加熱硬化させればよ
い。Next, a resin resin is injected through the opening 19. The injected resin was male and female 15 and 1
6 flows into the molding space 21 to every corner and is filled in order from the bottom while pushing up the bubbles upward, and eventually reaches the opening 19. The air bubbles in the molding space 21 are discharged to the outside through the opening 19 and the air vent hole 20. The injection of the resisticon is performed up to the height of the bottom surface of the opening 19. Thereby, it is possible to make the thickness of the bottom wall of the artificial marble bathtub 10 uniform. Thereafter, a lid 22 made of FRP in which the prepreg sheet 3 prepreg as a reinforcing layer is disposed on the lower surface side is prepared, and the opening 19 is closed. Then, the resin conic may be cured by heating in the state as it is.
【００１３】図２は、本発明の第２の実施の形態に係る
成形型２３を示す縦断面図である。この第２の実施の形
態では、雌型２４の上面（人造大理石浴槽１０の底壁の
全面に対応する部分）の全体を開口部２５としている。
その他の構成は、前記図１に示す第１の実施の形態の場
合と同じである。この成形型２３では、台車１５上の雄
型１６の成形面に、ゲルコート層としてのプリプレグさ
れたプリゲルシートと、透明な表面層としてのプリプレ
グされたプリゲルシートとを被せる。一方、雌型２６の
開口部２５を除く成形面に、製品の裏面の補強層を形成
するためのプリプレグされたプリゲルシートを装入す
る。そして、雄型１６に雌型１５を被せ、これらをクラ
ンプ装置１８でクランプする。FIG. 2 is a longitudinal sectional view showing a molding die 23 according to a second embodiment of the present invention. In the second embodiment, the entire upper surface of the female mold 24 (the portion corresponding to the entire bottom wall of the artificial marble bathtub 10) is an opening 25.
Other configurations are the same as those of the first embodiment shown in FIG. In the molding die 23, a prepreg prepreg sheet as a gel coat layer and a prepreg prepreg sheet as a transparent surface layer are put on the molding surface of the male mold 16 on the carriage 15. On the other hand, a prepreg-prepared prepreg sheet for forming a reinforcing layer on the back surface of the product is inserted into the molding surface of the female mold 26 except for the opening 25. Then, the female die 15 is put on the male die 16 and these are clamped by the clamp device 18.
【００１４】次に、上面の大きな開口部２５から樹脂材
料のレジコンを注入する。注入されたレジコンは、成形
空間２１内を隅々まで流動し、気泡を上方へ押し上げな
がら下方から順に充満され、開口部２５の材料面レベル
を押し上げるようになる。レジコンの注入は、注入され
た材料の上面が雄型１６の成形面から所定寸法（例え
ば、１０ｍｍ）の高さになるまで行う。そして、レジコ
ンの上面に、製品裏面の補強層を形成するためのプリプ
レグされたプリゲルシート３を被覆し、この状態でレジ
コンを加熱硬化させればよい。なお、この実施の形態で
は、レジコン自体の流動性を利用して開口部２５の材料
上面の平滑性を確保し、均一な肉厚の浴槽底壁を得るよ
うにしている。Next, a resin resin is injected through a large opening 25 on the upper surface. The injected resin flows in the molding space 21 to every corner, and is filled in order from below while pushing up the bubbles upward, so that the material level of the opening 25 is pushed up. The resin is injected until the upper surface of the injected material has a predetermined size (for example, 10 mm) from the molding surface of the male mold 16. Then, a prepreg sheet 3 that has been prepregged to form a reinforcing layer on the back surface of the product may be coated on the upper surface of the resin condenser, and the resin condenser may be heated and cured in this state. In this embodiment, the smoothness of the upper surface of the material of the opening portion 25 is ensured by utilizing the fluidity of the resin condenser itself, and a bathtub bottom wall having a uniform thickness is obtained.
【００１５】ところで、本発明は上述した実施の形態に
限定されるものではなく、適宜の変更が可能である。例
えば、開口部１９及び２５のレジコンの上面に、吹き付
けにより補強層を形成するようにしてもよい。またゲル
コート層や透明な表面層、裏面の補強層等も吹き付けに
より形成するようにしてもよい。更に、製品は人造大理
石浴槽以外にも洗面カウンターや浴室カウンター等のカ
ウンター類やその他の樹脂製品であってもよい。Incidentally, the present invention is not limited to the above-described embodiment, and can be appropriately changed. For example, a reinforcing layer may be formed by spraying on the upper surface of the register in the openings 19 and 25. Further, a gel coat layer, a transparent surface layer, a backside reinforcing layer, and the like may be formed by spraying. Further, the product may be counters such as a washbasin counter and a bathroom counter other than the artificial marble bathtub, and other resin products.
【００１６】[0016]
【発明の効果】以上説明したように本発明にあっては、
雄型の上に雌型を被せて成形空間を形成し、雌型の上面
側に開口部を設け、この開口部から前記成形空間へ樹脂
材料を注入し、樹脂材料の自重により成形空間へ流動さ
せ、樹脂材料が前記開口部の高さまで達したとき、開口
面の露出面に補強層を設けて硬化させるようにしたか
ら、内部に気泡が残ったり、樹脂材料が不足したりする
ことがなく、均一な充填が行える。また成形型自体は、
雌雄型の全部を樹脂型とすることができ、その成形が容
易である。更に、型合わせや脱型等も手作業で行うこと
ができ、大型の設備は不要である。As described above, in the present invention,
A molding space is formed by placing a female mold on the male mold, an opening is provided on the upper surface side of the female mold, a resin material is injected into the molding space from the opening, and flows into the molding space by its own weight. When the resin material reaches the height of the opening, the reinforcing layer is provided on the exposed surface of the opening surface and the resin material is cured, so that no bubbles remain inside or the resin material runs short. And uniform filling can be performed. The mold itself is
All of the male and female molds can be resin molds, and their molding is easy. Furthermore, mold matching and demolding can be performed manually, and large equipment is not required.
【図１】本発明の第１の実施の形態に係る成形型の縦断
面図である。FIG. 1 is a longitudinal sectional view of a molding die according to a first embodiment of the present invention.
【図２】本発明の第２の実施の形態に係る成形型の縦断
面図である。FIG. 2 is a longitudinal sectional view of a molding die according to a second embodiment of the present invention.
【図３】従来技術に関するものであり、図（Ａ）は雌型
の縦断面図、図（Ｂ）は雄型の縦断面図、図（Ｃ）は型
合わせ後の成形型の縦断面図である。FIGS. 3A and 3B relate to the prior art, wherein FIG. 3A is a longitudinal sectional view of a female mold, FIG. 3B is a longitudinal sectional view of a male mold, and FIG. It is.
【図４】従来技術の問題点を説明するためのものであ
り、図（Ａ）は硬化前の状態を示す成形型の横断面図、
図（Ｂ）は硬化後の状態を示す成形型の横断面図であ
る。FIG. 4 is a view for explaining a problem of the prior art, and FIG. 4A is a cross-sectional view of a molding die showing a state before curing.
FIG. (B) is a cross-sectional view of the molding die showing a state after curing.
【図５】従来の別の成形型を示す縦断面図である。FIG. 5 is a longitudinal sectional view showing another conventional molding die.
１０…樹脂製品（人造大理石浴槽） １４…成形型 １６…雄型 １６…雌型 １９…開口部 ２１…成形空間 ２２…蓋 ２３…成形型 ２５…開口部 DESCRIPTION OF SYMBOLS 10 ... Resin product (artificial marble bathtub) 14 ... Mold 16: Male 16: Female 19: Opening 21: Molding space 22: Lid 23: Mold 25: Opening
───────────────────────────────────────────────────── フロントページの続き (72)発明者 平岡 良一 愛知県常滑市鯉江本町５丁目１番地 株式 会社イナックス内 Ｆターム(参考） 4F202 AA21 AA41 AD08 AD11 AF09 AG07 AH49 CA01 CB01 CB13 CK41 CK43 CL02 4F204 AA21 AA41 AD08 AD11 AF09 AG07 AH49 EA03 EB01 EB13 EF01 EK13 EK17 EK24 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Ryoichi Hiraoka 5-1-1 Koiehonmachi, Tokoname-shi, Aichi F-term in Inax Co., Ltd. (Reference) 4F202 AA21 AA41 AD08 AD11 AF09 AG07 AH49 CA01 CB01 CB13 CK41 CK43 CL02 4F204 AA21 AA41 AD08 AD11 AF09 AG07 AH49 EA03 EB01 EB13 EF01 EK13 EK17 EK24
Claims (3)
し、雌型の上面側に開口部を設け、この開口部から前記
成形空間へ樹脂材料を注入し、樹脂材料の自重により成
形空間へ流動させ、樹脂材料が前記開口部の高さまで達
したとき、開口面の露出面に補強層を設けて硬化させる
ようにしたことを特徴とする樹脂製品の製造方法。A molding space is formed by placing a female mold on a male mold, an opening is provided on the upper surface side of the female mold, and a resin material is injected into the molding space from the opening, and the weight of the resin material is reduced. The method according to claim 1, wherein when the resin material reaches the height of the opening, a reinforcing layer is provided on the exposed surface of the opening to cure the resin.
請求項１に記載の樹脂製品の製造方法。2. The method according to claim 1, wherein the opening is covered with a lid before curing.
請求項１に記載の樹脂製品の製造方法。3. The method for manufacturing a resin product according to claim 1, wherein the opening extends over the entire area of the molded product.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16038299A JP3603257B2 (en) | 1999-06-08 | 1999-06-08 | Manufacturing method of resin products |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16038299A JP3603257B2 (en) | 1999-06-08 | 1999-06-08 | Manufacturing method of resin products |
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| JP2000343535A true JP2000343535A (en) | 2000-12-12 |
| JP3603257B2 JP3603257B2 (en) | 2004-12-22 |
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| JP16038299A Expired - Fee Related JP3603257B2 (en) | 1999-06-08 | 1999-06-08 | Manufacturing method of resin products |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003026865A1 (en) * | 2001-09-20 | 2003-04-03 | Honda Giken Kogyo Kabushiki Kaisha | Method of manufacturing concrete mold |
| KR100976876B1 (en) | 2008-04-22 | 2010-08-23 | 박기만 | Manufacturing method of artificial marble headstone for sperm |
-
1999
- 1999-06-08 JP JP16038299A patent/JP3603257B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003026865A1 (en) * | 2001-09-20 | 2003-04-03 | Honda Giken Kogyo Kabushiki Kaisha | Method of manufacturing concrete mold |
| US6805819B2 (en) | 2001-09-20 | 2004-10-19 | Honda Giken Kogyo Kabushiki Kaisha | Method of manufacturing concrete form |
| KR100976876B1 (en) | 2008-04-22 | 2010-08-23 | 박기만 | Manufacturing method of artificial marble headstone for sperm |
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| Publication number | Publication date |
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| JP3603257B2 (en) | 2004-12-22 |
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