WO1997033738A1 - Hot plate molding method for molded resin foam - Google Patents
Hot plate molding method for molded resin foam Download PDFInfo
- Publication number
- WO1997033738A1 WO1997033738A1 PCT/JP1996/000713 JP9600713W WO9733738A1 WO 1997033738 A1 WO1997033738 A1 WO 1997033738A1 JP 9600713 W JP9600713 W JP 9600713W WO 9733738 A1 WO9733738 A1 WO 9733738A1
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- WO
- WIPO (PCT)
- Prior art keywords
- foamed resin
- resin sheet
- hot plate
- molding
- sheet
- Prior art date
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Classifications
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- 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/10—Forming by pressure difference, e.g. vacuum
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- 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/14—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor using multilayered preforms or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/56—Stoppers or lids for bottles, jars, or the like, e.g. closures
- B29L2031/565—Stoppers or lids for bottles, jars, or the like, e.g. closures for containers
Definitions
- the present invention relates to a hot plate molding method for a foamed resin molded article, and more specifically, a hot sheet molding of a laminated sheet obtained by laminating a foamed resin sheet and a foamed resin sheet and a synthetic resin film. Accordingly, the present invention relates to a method of molding into a synthetic resin molded article such as a container for instant food or the like and a lid thereof, or a synthetic resin molded article having a shape similar to those containers and lids.
- a non-foamed synthetic resin sheet heated to a moldable temperature by passing through a heating zone is sent to the molding zone, and a non-foamed synthetic resin sheet is desired in the molding zone.
- the step of forming into the shape of is performed.
- the non-foamed synthetic resin sheet has good thermal conductivity between the front and back surfaces because it has no air bubbles in the inner layer. Therefore, non-foaming synthetic tree If the target is a grease sheet, the above-mentioned vacuum / pressure forming method can achieve high-precision molding with a certain degree of sharpness.
- the foamed resin sheet was molded into a container or a lid by applying the vacuum pressure molding method, the following problems were found.
- the softened foamed resin sheet may hang down or bend.
- the intended portion of the foamed resin sheet is displaced from the molding die, and the foamed resin molded article can be molded at an appropriate location on the foamed resin sheet. It disappears.
- the surface of the container is printed and printed.Synthetic resin film with the printed display is usually laminated on the foamed resin sheet.
- the container or lid which is the final molded article, is formed. The print display part of is shifted from the normal position.
- a foamed resin sheet or a laminated sheet composed of a foamed resin sheet and a synthetic resin film is formed by a hot plate forming method.
- the foamed resin sheet heated by the hot plate and the laminated sheet are formed using a hot plate forming method that can be formed immediately at the heating position, there will be irregularities such as containers and lids.
- the position of the sheet to be molded did not deviate from the molding die, and the fact that the synthetic resin molded article was molded at an appropriate position on the sheet was ascertained. .
- the foamed resin sheet has excellent heat insulating properties due to the bubbles existing in the inner layer.
- the heat of the hot plate depends on the thickness of the foamed resin sheet. It may happen that the information is not sufficiently transmitted to the other side. If the foamed resin sheet placed between the hot plate and the molding die in such a state is formed by hot plate forming, it will be difficult to form fine and sharp details with high precision. To improve this point, it is conceivable to increase the heating temperature by the hot plate or lengthen the heating time.However, when the heating temperature is increased, the secondary foaming of the foamed resin sheet occurs remarkably.
- the hot plate molding of the details of a foamed resin molded body such as a container or a lid formed from a foamed resin sheet or a laminated sheet is required to be as fine and precise as required.
- the present invention is based on the fact that a foamed resin sheet such as a foamed polystyrene resin sheet is hot-plated to form a foamed resin molded article such as a container or a lid.
- a hot plate molding method for a foamed resin molded article that enables fine, sharp, high-precision molding of the details of the foamed resin molded article and that can be easily mass-produced without surface roughness. The purpose is to provide. Disclosure of the invention
- a foamed resin sheet fed into a molding zone is arranged between a hot plate installed in the molding zone and a molding die, and the foaming is performed.
- One side of the resin sheet is placed along the hot plate to heat the foamed resin sheet from one side, and a differential pressure is generated between one side and the other side of the foamed resin sheet.
- Hot foaming of a foamed resin molded article to be molded by moving the foamed resin sheet along the molding surface of the mold the foamed resin sheet is heated from the other side by a preheating zone provided in front of the molding zone to preheat the foamed resin sheet, and the foamed resin sheet after the preheating is described above. It is sent to the molding zone.
- the foamed resin sheet fed into the forming zone is preheated by being heated from the other side by the preheating zone, and such preheating is performed.
- the foamed resin sheet is heated from one side by a hot plate in a molding zone. Therefore, at the stage of molding by generating a pressure difference between one surface side and the other surface side of the foamed resin sheet and causing the foamed resin sheet to be along the molding surface of the mold, heat is applied to the entire thickness portion.
- the foamed resin sheet that has been sufficiently transmitted faithfully follows the molding surface of the mold.
- the foamed resin molded article can be molded with high precision in a sharp and detailed manner. When the final molded article is used for pouring hot water, the molded article is not easily deformed even when hot water is added.
- the preheating by heating the foamed resin sheet in the preheating zone is performed by the radiant heat of the far-infrared heater, the effect of the heating is not only on the other surface of the foamed resin sheet but also on the other side. Since it reaches the inner layer in a short time, the preheating of the foamed resin sheet can be sufficiently performed in a short time.
- the preheating temperature of the foamed resin sheet is set to a temperature lower than the glass transition point of the foamed resin sheet, the foamed resin sheet is not softened so that there is no danger of sagging or bending.
- a foamed polystyrene resin sheet can be suitably used as the foamed resin sheet.
- Foamed polystyrene resin sheets have excellent heat insulation properties, and are suitable for molding synthetic resin molded articles such as containers for instant foods and lids, which are prepared by pouring hot water into them.
- a foamed polystyrene resin sheet can be used as the foamed resin sheet. It is desirable that the thickness of the foamed synthetic resin sheet be set to 0.3 to 0.95 mm.
- the preferred thickness of the foam synthetic resin sheet for molding containers and lids for ready-to-eat food is 0.5 to 0.9 mm, and the most preferred thickness is 0.65 to 0.85 mm. It is. If the foamed synthetic resin sheet is too thick, preheating and molding may take time, and the molding cycle time may not be able to be shortened to the level of mass production. Conversely, if the foamed polystyrene resin sheet is too thin, it will not be possible to satisfactorily insulate the container or lid as a foamed synthetic resin molded article.
- the hot plate molding method for a foamed resin molded article as described above can be applied to a laminated sheet made of a foamed resin sheet and a synthetic resin film as it is. Has the same effect Brief description of the drawings
- FIG. 1 is an explanatory view showing a preheating zone and a molding zone for performing the hot plate molding method for a foamed resin molded article according to the present invention.
- FIG. 2A is an explanatory view showing a state in which a foamed resin sheet is provided between a hot plate and a mold.
- FIG. 2B is an explanatory view of the step of heating the foamed resin sheet with a hot plate.
- FIG. 2C is an explanatory diagram of a step of molding a foamed resin molded article.
- FIG. 2D is an explanatory view of the molded foamed resin article.
- FIG. 3 is a schematic perspective view showing a lid as a foamed resin molded body and a container to which the lid is attached.
- Figure 4 is an enlarged cross-sectional view of the lid and part of the container.
- FIG. 5 is an enlarged sectional view of a part of a lid as a foamed resin molded article molded from a laminated sheet.
- FIG. 1 shows a preheating zone A for performing a hot plate molding method for a foamed resin molded article according to the present invention, and a molding zone B provided adjacent thereto.
- the preheating zone A is located in front of the molding zone B, and the foamed resin sheet fed into the preheating zone A 1 is fed into forming zone B after being preheated in its preheating zone A.
- Preheating zone A is provided with heating unit 2 consisting of a far infrared heater.
- heating unit 2 consisting of a far infrared heater.
- a hot plate 3 and a molding die 4 are provided in the molding zone B.
- the hot plate 3 and the mold 4 have ventilation holes (not shown) connected to an air supply device or a suction device, so that air can be supplied or sucked through the ventilation holes.
- a pressure difference is generated between one side 11 and the other side 12 of the foamed resin sheet 1 disposed between the hot plate 3 and the molding die 4, and the pressure difference causes the foamed resin sheet 1 to move. 1 can be made to follow the molding surface 41 of the molding die 4.
- the foamed resin sheet 1 is first fed into the preheating zone A.
- the foamed resin sheet 1 sent into the preheating zone A is heated from the other side 12 by the radiant heat of the heating unit 2. Since the heating unit 2 uses far-infrared rays, the effect of heating is short, not only on the other surface 12 of the foamed resin sheet 1 but also on its inner layer, Therefore, the preheating of the foamed resin sheet 1 is sufficiently performed in a short time.
- the foamed resin sheet 1 preheated in the preheating zone A is sent to the molding zone B, and is disposed between the hot plate 3 and the molding die 4.
- 2A to 2D illustrate the process of molding the lid of the instant container with the molding bon A.
- the mold 4 in Fig. 1 Although the shape of the molding surface 4 1 is different from that of the molding die 4 of FIGS. 2A to 2D, this is illustrated in FIGS. 1 and 2A to 2D. This is because it is merely an accurate representation of the molding surface 1 of the actual mold 4.
- the foamed resin sheet 1 for forming the lid a foamed polystyrene resin sheet having a thickness of 0.3 to 0.95 mm and an expansion ratio of 1.5 to 8 times is used. I have. As described in FIG. 1, the foamed resin sheet 1 preheated in the preheating zone A is fed into the molding zone B. Then, the foamed resin sheet 1 sent into the molding zone B is disposed between the hot plate 3 and the molding die 4 as shown in FIG. 2A. Next, as shown in Fig. 2B, the foamed resin sheet 1 is sandwiched between the hot plate 3 and the molding die 4, and the foamed resin sheet 1 is blown out from the molding die 4 'side as indicated by an arrow.
- the foamed resin sheet 1 By heating the foamed resin sheet 1 from the one side 11 side with the one side 11 along the heat pipe 3, the foamed resin sheet 1 is heated to a moldable temperature. After such heating, air is blown out from the hot plate 3 side as shown in FIG. 2C, so that one side 11 side of the foamed resin sheet 1 and the other side 12 side are formed.
- the foamed resin sheet 1 softened by the action of the pressure difference is brought into close contact with the molding surface 41 of the molding die 4, and a plurality of lids 20 are formed at a plurality of locations on the foamed resin sheet 1. Simultaneous molding to After releasing the mold as shown in FIG. 2D, the individual lids 2 are punched out of the foamed resin sheet 1.
- foaming resin sheet 1 in preheating zone A is used.
- the preheating temperature is set to a temperature lower than the glass transition point of the foamed resin sheet 1, specifically, about 50.
- the heating temperature of the foamed resin sheet 1 by the hot plate 3 in the molding zone B is about 100 to 140 ° C., and the time from the start of heating to the end of molding is 6 seconds.
- the differential pressure between one side 11 and the other side 12 of the foamed resin sheet 1 described in FIG. 2C is 3 to 5 kg / cm 2 .
- the foamed resin sheet 1 is used, a laminated sheet in which the synthetic resin film is laminated on the foamed resin sheet 1 can also be used.
- the laminated sheet preferably has a thickness of the foamed resin sheet of 0.3 to 0.95 mm and a thickness of the synthetic resin film of 15 to 80 m.
- the synthetic resin film is useful not only for printing on the lid 20 but also for suppressing the cracking etc. by supplementing the strength of the foamed resin sheet 1 forming the lid 20. Useful.
- the lid 20 molded in this way has excellent heat retention during pouring and not only does not eliminate the danger of burns when draining, but also has a sharp and high-level detail, such as the fitting part. It is molded with high precision and can be mass-produced.
- FIG. 3 shows a container 10 used for ready-to-eat foods, specifically “quick fried noodles” or “quick ⁇ ”, and a lid 20 formed by the above-described method of the present invention.
- the container 10 is made of expanded polystyrene resin or expanded polypropylene resin having a high expansion ratio (about 10 times).
- the lid 20 is mounted on the container 10 by fitting the fitting projection 21 on the peripheral edge thereof to the lid receiving portion 15 on the container 10 side. Then, in order to ensure the mounting state, an engaging ridge 22 is formed inward on the fitting projection 21, and the engaging ridge 22 is formed on the lid receiving portion 15. It is designed to engage with.
- the lid 20 has a hollow frame portion 23 for accommodating the lid receiving portion 15 in a fitting shape in an outer peripheral portion in a swelling shape, and the hollow frame portion 23 has two hollow frame portions. Diagonal corners are used for pouring and draining water and venting / J ⁇ An opening 24 and a cut-and-raised piece 25 for closing it are provided, and the product name of the contents can be displayed in three dimensions. A bulged portion 26 for display and small protrusions 27 are provided at predetermined positions on the inner side of the hollow frame portion 23.
- the fitting projection 21, the engaging ridge 22, the hollow frame 23, and the small projection 27 described above correspond to the details of the lid 20, and these details are fine, sharp, and precise. It is molded into.
- FIG. 5 shows a part of the lid 20 formed by the method of the present invention using the above-described laminated sheet.
- 1 is a foamed resin sheet
- 5 is a synthetic resin film.
- details such as a fitting projection 21, an engagement ridge 22, a hollow frame 23, and a small projection 27 are formed with high precision and sharpness.
- the hot plate molding method for a foamed resin molded article according to the present invention comprises the steps of: preheating a foamed resin sheet by heating the other side of the laminated sheet with a preheating zone; Since one side of the sheet is heated after being heated in the molding zone, the heat is sufficiently transmitted to the entire thickness of the foamed resin sheet during molding. Therefore, not only is it possible to form fine, sharp, and high-precision molding, but also the molding cycle time is short, and mass production can be easily performed.
- the cycle time for molding can be further reduced.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
A method of producing a molded resin foam, such as a cover (20) for an instant food container finely and sharply with a high precision by a hot plate molding method, wherein a sheet (1) of resin foam is preheated from one surface (12) thereof in a preheating zone (A), and the preheated sheet (1) of resin foam is fed to a molding zone (B), in which the same sheet (1) is positioned between a hot plate (3) and a mold (4) and heated at the other surface (11) thereof with the hot plate (3) with the sheet (1) of resin foam placed along a molding surface (41) of the mold (4) by an air pressure, whereby the sheet (1) of resin foam is molded. When this method is employed, a molded body of resin foam, such as a cover for an instant Chinese noodle container which requires a high precision at its fine parts can be molded finely and sharply with a high precision, and the mass production of such a product can be carried out easily by shortening the molding cycle.
Description
明 細 書 発泡樹脂成形体の熱板成形方法 技術分野 Description Hot plate molding method for foamed resin molded articles
本発明は、 発泡樹脂成形体の熱板成形方法、 詳し く は発泡 樹脂シ一 トゃ発泡樹脂シ一 ト と合成樹脂フ ィ ルム とを積層一 体化した積層シー トを、 熱板成形する こ とによ っ て即席食品 などの容器やその蓋などの合成樹脂成形体、 あるいはそれら の容器や蓋と形状が類似した合成樹脂成形体に成形する方法 に関する。 背景技術 The present invention relates to a hot plate molding method for a foamed resin molded article, and more specifically, a hot sheet molding of a laminated sheet obtained by laminating a foamed resin sheet and a foamed resin sheet and a synthetic resin film. Accordingly, the present invention relates to a method of molding into a synthetic resin molded article such as a container for instant food or the like and a lid thereof, or a synthetic resin molded article having a shape similar to those containers and lids. Background art
従来、 即席麵ゃ弁当類などを入れる こ とに用いられる比較 的底の浅い容器や蓋を非発泡の樹脂成形体で作る場合、 非発 泡の合成樹脂シー トを真空圧空成形する という方法が一般的 に採用されていた。 Conventionally, when a relatively shallow bottom container or lid used for storing instant lunches and the like is made of a non-foamed resin molded body, a method of vacuum-pressure forming a non-foamed synthetic resin sheet has been used. It was generally adopted.
真空圧空成形方法では、 加熱ゾー ンを経る こ とによ り成形 可能温度に加熱された非発泡の合成樹脂シー トを成形ゾー ン に送り込み、 成形ゾー ンにおいて非発泡の合成樹脂シー トを 所望の形状に成形する という工程が行われる。 非発泡の合成 樹脂シー トはその内層部分に気泡を有していないので表裏両 面間での熱伝導性が良好である。 そのため、 非発泡の合成樹
脂シー トを対象とするのであれば、 上記の真空圧空成形方法 である程度シャ ープで高精度の成形が可能である。 In the vacuum pressure molding method, a non-foamed synthetic resin sheet heated to a moldable temperature by passing through a heating zone is sent to the molding zone, and a non-foamed synthetic resin sheet is desired in the molding zone. The step of forming into the shape of is performed. The non-foamed synthetic resin sheet has good thermal conductivity between the front and back surfaces because it has no air bubbles in the inner layer. Therefore, non-foaming synthetic tree If the target is a grease sheet, the above-mentioned vacuum / pressure forming method can achieve high-precision molding with a certain degree of sharpness.
とこ ろで、 上記したよ うな容器や蓋については、 容器に注 いだ熱湯の温度が容器や蓋を持った手に伝わり に く く なる程 度の断熱性の要求される こ とが多々 ある。 こ の要求に応える ためには、 容器や蓋を発泡樹脂成形体で作る こ とが有効であ る However, such containers and lids often require heat insulation such that the temperature of the hot water poured into the container is not easily transmitted to the hand holding the container or lid. . In order to meet this demand, it is effective to make containers and lids with foamed resin moldings
そこで、 内層部分の存在する気泡によ って優れた断熱性を 発揮する発泡樹脂シー トを対象と して上記した真空圧空成形 方法を適用する こ とが考えられた。 Therefore, it was conceived to apply the above-mentioned vacuum pressure forming method to a foamed resin sheet that exhibits excellent heat insulating properties due to bubbles in the inner layer.
しかしながら、 真空圧空成形方法を適用 して発泡樹脂シー トを容器や蓋に成形する と、 次のよ うな問題点が知見された 。 すなわち、 軟化ゾー ンで成形可能温度に発泡樹脂シー ト の 全厚部分を加熱する と、 軟化した発泡樹脂シー トが垂れ下が つたり屈曲した りする こ とがあ り、 そのような形態で発泡樹 脂シー トが成形ゾー ンに送り込まれる と、 発泡樹脂シー ト の 成形予定箇所が成形型に対し位置ずれして発泡樹脂シー 卜の 適正箇所に発泡樹脂成形体を成形する こ とができな く なる。 即席麵な どの容器や蓋では、 その表面に印刷表示を施すこ と が多 く 、 通常は発泡樹脂シー ト に印刷表示を施した合成樹脂 フ ィ ルムが積層一体化されているので、 上記のよう に発泡樹 脂シー トの適正箇所に発泡樹脂成形体を成形する こ とができ な く なる よ うな事態が起こ る と、 最終成形品である容器や蓋
の印刷表示箇所が正規の位置からずれて しま う。 However, when the foamed resin sheet was molded into a container or a lid by applying the vacuum pressure molding method, the following problems were found. In other words, when the entire thickness of the foamed resin sheet is heated to the moldable temperature by the softening zone, the softened foamed resin sheet may hang down or bend. When the foamed resin sheet is fed into the molding zone, the intended portion of the foamed resin sheet is displaced from the molding die, and the foamed resin molded article can be molded at an appropriate location on the foamed resin sheet. It disappears. In many cases, such as instant containers and lids, the surface of the container is printed and printed.Synthetic resin film with the printed display is usually laminated on the foamed resin sheet. As described above, when it becomes impossible to mold the foamed resin molded article at an appropriate location on the foamed resin sheet, the container or lid, which is the final molded article, is formed. The print display part of is shifted from the normal position.
このよ う な状況のも とで、 本願発明者は種々研究を重ねた 結果、 発泡樹脂シー トや、 発泡樹脂シー ト と合成樹脂フ ィ ル 厶とでなる積層シー トは、 熱板成形方法、 すなわち熱板で加 熱した発泡樹脂シー トゃ積層シー トをその加熱位置で直ちに 成形する こ とのできる熱板成形方法を用いて成形すれば、 容 器や蓋のよ う な凹凸のある合成樹脂成形体を成形して も上記 シー 卜の成形予定箇所が成形型に対して位置ずれ しな く な り 、 シー ト の適正箇所に合成樹脂成形体が成形される という事 実を突き止めた。 Under such circumstances, the inventors of the present invention have conducted various studies and found that a foamed resin sheet or a laminated sheet composed of a foamed resin sheet and a synthetic resin film is formed by a hot plate forming method. In other words, if the foamed resin sheet heated by the hot plate and the laminated sheet are formed using a hot plate forming method that can be formed immediately at the heating position, there will be irregularities such as containers and lids. Even when a synthetic resin molded article was molded, the position of the sheet to be molded did not deviate from the molding die, and the fact that the synthetic resin molded article was molded at an appropriate position on the sheet was ascertained. .
とこ ろで、 発泡樹脂シー トは内層部分に存在する気泡のた めに優れた断熱性を有している。 そのため、 熱板成形に際し 、 その成形ゾー ンで発泡樹脂シー トを熱板に沿わせて片面側 から加熱するだけでは、 その厚さによ っては熱板の熱が発泡 樹脂シ一 卜の他面側にまで十分に伝達しないという事態が起 こ り得る。 そのよ うな状態のま ま熱板と成形型との間に配備 した発泡樹脂シー トを熱板成形する と、 細部についてきめ細 かにシャープで高精度の成形がなされに く い。 こ の点を改善 するためには、 熱板による加熱温度を高めたり加熱時間を長 く したりする こ とが考えられるけれども、 加熱温度を高める と発泡樹脂シー トの 2次発泡が顕著に起こ って合成樹脂成形 体に表面荒れが生じる原因になり、 加熱時間を長 く する と 1 サイ クルの成形に要する時間が長く なって量産化の障害にな
る。 上記した積層シー 卜についても同様のこ とがいえる。 そこで、 発泡樹脂シー トや積層シー トから成形される容器 や蓋などの発泡樹脂成形体の細部の成形を、 それに要求され る程度にきめ細かく シ ャ ープに高精度で熱板成形する こ とが でき、 しかも 2次発泡に伴う表面荒れを生じに く く しかも容 易に量産化が可能になる方法を鋭意研究した結果、 本発明を 完成するに至った。 At this point, the foamed resin sheet has excellent heat insulating properties due to the bubbles existing in the inner layer. For this reason, in hot plate forming, if the foamed resin sheet is simply heated from one side along the hot plate in the molding zone, the heat of the hot plate depends on the thickness of the foamed resin sheet. It may happen that the information is not sufficiently transmitted to the other side. If the foamed resin sheet placed between the hot plate and the molding die in such a state is formed by hot plate forming, it will be difficult to form fine and sharp details with high precision. To improve this point, it is conceivable to increase the heating temperature by the hot plate or lengthen the heating time.However, when the heating temperature is increased, the secondary foaming of the foamed resin sheet occurs remarkably. As a result, the surface of the synthetic resin molded article becomes rough, and if the heating time is prolonged, the time required for molding one cycle becomes longer, which hinders mass production. You. The same can be said for the laminated sheet described above. Therefore, the hot plate molding of the details of a foamed resin molded body such as a container or a lid formed from a foamed resin sheet or a laminated sheet is required to be as fine and precise as required. As a result of diligent research on a method that makes it possible to easily produce a mass-produced product without causing surface roughness due to secondary foaming, the present invention has been completed.
すなわち、 本発明は、 発泡ポ リ スチ レ ン樹脂シー トな どの 発泡樹脂シー トを熱板成形する こ とによ って容器や蓋な どの 発泡樹脂成形体を成形する こ とを基本と し、 その場合に、 発 泡樹脂成形体の細部についてきめ細かく シャープで高精度の 成形が可能で、 しかも表面荒れを生じずに量産化が容易に可 能になる発泡樹脂成形体の熱板成形方法を提供する こ とを目 的とする。 発明の開示 That is, the present invention is based on the fact that a foamed resin sheet such as a foamed polystyrene resin sheet is hot-plated to form a foamed resin molded article such as a container or a lid. In such a case, a hot plate molding method for a foamed resin molded article that enables fine, sharp, high-precision molding of the details of the foamed resin molded article and that can be easily mass-produced without surface roughness. The purpose is to provide. Disclosure of the invention
本発明に係る発泡樹脂成形体の熱板成形方法は、 成形ゾー ンに送り込まれた発泡樹脂シー トをその成形ゾー ンに設置さ れた熱板と成形型との間に配備し、 その発泡樹脂シー ト の片 面を上記熱板に沿わせてその発泡樹脂シ一 トを片面側から加 熱する と共に、 その発泡樹脂シー トの片面側と他面側との間 に差圧を生じさせてその発泡樹脂シー トを上記成形型の成形 面に沿わせる こ とによって成形する発泡樹脂成形体の熱板成
形方法において、 成形ゾー ンの手前に設けられた予熱ゾー ン で発泡榭脂シ一 トを他面側から加熱してその発泡樹脂シー ト を予熱し、 予熱した後の発泡樹脂シー トを上記成形ゾー ンに 送り込む、 という ものである。 In the hot plate molding method for a foamed resin molded article according to the present invention, a foamed resin sheet fed into a molding zone is arranged between a hot plate installed in the molding zone and a molding die, and the foaming is performed. One side of the resin sheet is placed along the hot plate to heat the foamed resin sheet from one side, and a differential pressure is generated between one side and the other side of the foamed resin sheet. Hot foaming of a foamed resin molded article to be molded by moving the foamed resin sheet along the molding surface of the mold In the molding method, the foamed resin sheet is heated from the other side by a preheating zone provided in front of the molding zone to preheat the foamed resin sheet, and the foamed resin sheet after the preheating is described above. It is sent to the molding zone.
この熱板成形方法による と、 成形ゾー ンに送り込まれる発 泡樹脂シ一 トは、 予熱ゾー ンで他面側から加熱される こ とに よ り予熱が行われており、 そのよ う に予熱されている発泡樹 脂シー 卜が成形ゾー ンで熱板によ り片面側から加熱される。 そのため、 発泡樹脂シー トの片面側と他面側との間に差圧を 生じさせてその発泡樹脂シー トを成形型の成形面に沿わせる こ とによって成形する段階では、 全厚部分に熱が十分に伝達 した発泡樹脂シー トが成形型の成形面に忠実に沿う。 これに よ り、 発泡樹脂成形体が、 細部についてもきめ細か く シ ヤ ー プで高精度に成形される。 そ して、 成形された最終成形品が 熱湯を注ぐよ う な用途に使われる場合には、 熱湯を加えても その成形品が変形しに く い。 According to this hot plate forming method, the foamed resin sheet fed into the forming zone is preheated by being heated from the other side by the preheating zone, and such preheating is performed. The foamed resin sheet is heated from one side by a hot plate in a molding zone. Therefore, at the stage of molding by generating a pressure difference between one surface side and the other surface side of the foamed resin sheet and causing the foamed resin sheet to be along the molding surface of the mold, heat is applied to the entire thickness portion. The foamed resin sheet that has been sufficiently transmitted faithfully follows the molding surface of the mold. As a result, the foamed resin molded article can be molded with high precision in a sharp and detailed manner. When the final molded article is used for pouring hot water, the molded article is not easily deformed even when hot water is added.
上記の方法を採用する こ とによ り、 発泡樹脂シー トの加熱 温度を高く する必要がな く なるので発泡樹脂成形体が表面荒 れを生じず、 また、 発泡樹脂シー トの加熱時間を長く する必 要がないので量産化が容易に可能になる。 By adopting the above method, it is not necessary to increase the heating temperature of the foamed resin sheet, so that the surface of the foamed resin molded article does not become rough, and the heating time of the foamed resin sheet is reduced. Since it is not necessary to increase the length, mass production becomes easy.
上記の方法を行う に際し、 予熱ゾー ンでの発泡樹脂シー ト の加熱による予熱を、 遠赤外線ヒータの輻射熱で行う よう に する と、 加熱の影響が発泡樹脂シー トの他面だけでな く その
内層部分に も短時間で及ぶので、 短時間で発泡樹脂シー ト の 予熱が十分に行われる よ う になる。 In performing the above method, if the preheating by heating the foamed resin sheet in the preheating zone is performed by the radiant heat of the far-infrared heater, the effect of the heating is not only on the other surface of the foamed resin sheet but also on the other side. Since it reaches the inner layer in a short time, the preheating of the foamed resin sheet can be sufficiently performed in a short time.
ま た、 発泡樹脂シー トの予熱温度をその発泡樹脂シー ト の ガラス転移点よ り低い温度にする と、 発泡樹脂シー トが徒に 軟化して垂れ下がりや屈曲を起こすおそれがない。 Further, when the preheating temperature of the foamed resin sheet is set to a temperature lower than the glass transition point of the foamed resin sheet, the foamed resin sheet is not softened so that there is no danger of sagging or bending.
本発明において、 発泡樹脂シー ト と しては発泡ポ リ スチ レ ン樹脂シー ト を好適に採用する こ とができ る。 発泡ポ リ スチ レ ン樹脂シー ト は断熱性に優れているので、 熱湯を注いで調 理する よ う な即席食品な どの容器やその蓋な どの合成樹脂成 形体を成形するのに適する。 In the present invention, a foamed polystyrene resin sheet can be suitably used as the foamed resin sheet. Foamed polystyrene resin sheets have excellent heat insulation properties, and are suitable for molding synthetic resin molded articles such as containers for instant foods and lids, which are prepared by pouring hot water into them.
発泡樹脂シー ト と して発泡ポ リ スチ レ ン樹脂シー トを採用 する こ とができ る。 発泡合成樹脂シー ト はその厚さ を 0 . 3 〜 0 . 9 5 m mに してお く こ とが望ま しい。 即席食品の容器 や蓋を成形する場合の発泡合成樹脂シー 卜 の好ま しい厚さ は 0 . 5 〜 0 . 9 m mであ り、 最も好ま しい厚さ は 0 . 6 5 〜 0 . 8 5 m mである。 発泡合成樹脂シー ト が厚すぎる と、 予 熱や成形に時間がかかって成形サイ ク ル時間を量産化 レベル まで速め られないおそれがある。 逆に、 発泡ポ リ スチ レ ン樹 脂シー ト が薄すぎる と、 発泡合成樹脂成形体と しての容器や 蓋に満足のい く 断熱性が得られな く なる。 A foamed polystyrene resin sheet can be used as the foamed resin sheet. It is desirable that the thickness of the foamed synthetic resin sheet be set to 0.3 to 0.95 mm. The preferred thickness of the foam synthetic resin sheet for molding containers and lids for ready-to-eat food is 0.5 to 0.9 mm, and the most preferred thickness is 0.65 to 0.85 mm. It is. If the foamed synthetic resin sheet is too thick, preheating and molding may take time, and the molding cycle time may not be able to be shortened to the level of mass production. Conversely, if the foamed polystyrene resin sheet is too thin, it will not be possible to satisfactorily insulate the container or lid as a foamed synthetic resin molded article.
上記したよ う な発泡樹脂成形体の熱板成形方法は、 発泡樹 脂シ一 ト と合成樹脂フ ィ ルム とでなる積層 シー ト に もそのま ま適用する こ とができ、 その適用によ って同様の作用が奏さ
れる 図面の簡単な説明 The hot plate molding method for a foamed resin molded article as described above can be applied to a laminated sheet made of a foamed resin sheet and a synthetic resin film as it is. Has the same effect Brief description of the drawings
図 1 は本発明に係る発泡樹脂成形体の熱板成形方法を行う ための予熱ゾー ン と成形ゾー ンとを示した説明図である。 FIG. 1 is an explanatory view showing a preheating zone and a molding zone for performing the hot plate molding method for a foamed resin molded article according to the present invention.
図 2 Aは発泡樹脂シー トを熱板と成形型との間に配備した 状態の説明図である。 FIG. 2A is an explanatory view showing a state in which a foamed resin sheet is provided between a hot plate and a mold.
図 2 Bは発泡樹脂シ一 トを熱板で加熱する工程の説明図で ある。 FIG. 2B is an explanatory view of the step of heating the foamed resin sheet with a hot plate.
図 2 Cは発泡樹脂成形体を成形する工程の説明図である。 図 2 Dは離型した発泡樹脂成形体の説明図である。 FIG. 2C is an explanatory diagram of a step of molding a foamed resin molded article. FIG. 2D is an explanatory view of the molded foamed resin article.
図 3 は発泡樹脂成形体と しての蓋とその蓋が装着される容 器を示す概略斜視図である。 FIG. 3 is a schematic perspective view showing a lid as a foamed resin molded body and a container to which the lid is attached.
図 4 は蓋と容器の一部を拡大した断面図である。 Figure 4 is an enlarged cross-sectional view of the lid and part of the container.
図 5 は積層シ一 卜から成形した発泡樹脂成形体と しての蓋 の一部を拡大した断面図である。 発明を実施するための最良の形態 図 1 に本発明に係る発泡樹脂成形体の熱板成形方法を行う ための予熱ゾーン A とそれに隣接して設けられた成形ゾー ン B とを示してある。 予熱ゾー ン Aは成形ゾー ン Bの手前に設 けられており、 予熱ゾー ン Aに送り込まれた発泡樹脂シー ト
1 が、 その予熱ゾー ン Aで予熱された後、 成形ゾー ン B に送 り込まれる。 FIG. 5 is an enlarged sectional view of a part of a lid as a foamed resin molded article molded from a laminated sheet. BEST MODE FOR CARRYING OUT THE INVENTION FIG. 1 shows a preheating zone A for performing a hot plate molding method for a foamed resin molded article according to the present invention, and a molding zone B provided adjacent thereto. The preheating zone A is located in front of the molding zone B, and the foamed resin sheet fed into the preheating zone A 1 is fed into forming zone B after being preheated in its preheating zone A.
予熱ゾー ン Aには、 遠赤外線ヒータでなる加熱ュニ ッ 卜 2 が設けられている。 成形ゾー ン Bには、 熱板 3 と成形型 4 と が設けられている。 これらの熱板 3 や成形型 4 は、 給気装置 または吸引装置に接続された通気孔 (不図示) を有してお り 、 それらの通気孔を通して給気したり吸引 したりする こ とに よ って熱板 3 と成形型 4 との間に配備された発泡樹脂シー ト 1 の片面 1 1 側と他面 1 2側との間に差圧を生じさせ、 その 差圧によって発泡樹脂シー ト 1 を成形型 4 の成形面 4 1 に沿 わせる こ とができるよ う になつている。 Preheating zone A is provided with heating unit 2 consisting of a far infrared heater. In the molding zone B, a hot plate 3 and a molding die 4 are provided. The hot plate 3 and the mold 4 have ventilation holes (not shown) connected to an air supply device or a suction device, so that air can be supplied or sucked through the ventilation holes. As a result, a pressure difference is generated between one side 11 and the other side 12 of the foamed resin sheet 1 disposed between the hot plate 3 and the molding die 4, and the pressure difference causes the foamed resin sheet 1 to move. 1 can be made to follow the molding surface 41 of the molding die 4.
本発明による熱扳成形方法では、 発泡樹脂シ一 卜 1 が最初 に予熱ゾー ン Aに送り込まれる。 予熱ゾー ン Aに送り込まれ た発泡樹脂シ一 ト 1 は、 加熱ュニッ ト 2 の輻射熱によ って他 面 1 2側から加熱される。 加熱ュニッ ト 2 には遠赤外線ヒ一 夕が用いられているので、 それによる加熱の影響は、 発泡樹 脂シー ト 1 の他面 1 2 だけでな く その内層部分にも短時間で 及び、 そのために短時間で発泡樹脂シー ト 1 の予熱が十分に 行われる。 In the thermoforming method according to the present invention, the foamed resin sheet 1 is first fed into the preheating zone A. The foamed resin sheet 1 sent into the preheating zone A is heated from the other side 12 by the radiant heat of the heating unit 2. Since the heating unit 2 uses far-infrared rays, the effect of heating is short, not only on the other surface 12 of the foamed resin sheet 1 but also on its inner layer, Therefore, the preheating of the foamed resin sheet 1 is sufficiently performed in a short time.
予熱ゾー ン Aで予熱された発泡樹脂シー ト 1 は成形ゾー ン Bに送り込まれ、 熱板 3 と成形型 4 との間に配備される。 図 2 A〜図 2 Dは即席麵容器の蓋を成形ブー ン Aで成形す る工程を説明的に示したものである。 なお、 図 1 の成形型 4
と図 2 A〜図 2 Dの成形型 4 とはその成形面 4 1 の形状が異 なっているけれども、 これは図 1 や図 2 A〜図 2 Dで成形型 4 を説明的に示してあるにすぎず、 実際の成形型 4 の成形面 1 を忠実に示した ものではないからである。 The foamed resin sheet 1 preheated in the preheating zone A is sent to the molding zone B, and is disposed between the hot plate 3 and the molding die 4. 2A to 2D illustrate the process of molding the lid of the instant container with the molding bon A. The mold 4 in Fig. 1 Although the shape of the molding surface 4 1 is different from that of the molding die 4 of FIGS. 2A to 2D, this is illustrated in FIGS. 1 and 2A to 2D. This is because it is merely an accurate representation of the molding surface 1 of the actual mold 4.
上記蓋を成形するための発泡樹脂シー ト 1 には、 厚さ 0 . 3 〜 0 . 9 5 m mで発泡倍率が 1 . 5 〜 8 倍の発泡ポ リ スチ レ ン樹脂シー トが用いられている。 図 1 で説明 したよ う に予 熱ゾー ン Aで予熱された発泡樹脂シー ト 1 が成形ゾー ン Bに 送り込まれる。 そ して、 成形ゾー ン Bに送り込まれた発泡樹 脂シー ト 1 が図 2 Aのよう に熱板 3 と成形型 4 との間に配備 される。 次に、 図 2 Bのよう に熱板 3 と成形型 4 とで発泡樹 脂シー ト 1 が挟まれ、 成形型 4'側から矢印のよ う に吹き出 し たエアで発泡樹脂シー ト 1 の片面 1 1 を熱扳 3 に沿わせてそ の発泡樹脂シー ト 1 を片面 1 1 側から加熱する こ とによ り、 その発泡樹脂シー ト 1 を成形可能温度に加熱する。 このよう な加熱を行った後、 図 2 Cのよ う に熱板 3側からエアを吹き 出すこ とによ って発泡樹脂シー ト 1 の片面 1 1 側と他面 1 2 側との間に差圧を生じさせ、 その差圧の作用で軟化した発泡 樹脂シー ト 1 を成形型 4 の成形面 4 1 に密着状態に沿わせて 複数の蓋 2 0 を発泡樹脂シー ト 1 の複数箇所に同時成形する 。 そ して、 図 2 Dのよ う に離型した後、 個々 の蓋体 2 を発泡 樹脂シー ト 1 から打ち抜 く 。 As the foamed resin sheet 1 for forming the lid, a foamed polystyrene resin sheet having a thickness of 0.3 to 0.95 mm and an expansion ratio of 1.5 to 8 times is used. I have. As described in FIG. 1, the foamed resin sheet 1 preheated in the preheating zone A is fed into the molding zone B. Then, the foamed resin sheet 1 sent into the molding zone B is disposed between the hot plate 3 and the molding die 4 as shown in FIG. 2A. Next, as shown in Fig. 2B, the foamed resin sheet 1 is sandwiched between the hot plate 3 and the molding die 4, and the foamed resin sheet 1 is blown out from the molding die 4 'side as indicated by an arrow. By heating the foamed resin sheet 1 from the one side 11 side with the one side 11 along the heat pipe 3, the foamed resin sheet 1 is heated to a moldable temperature. After such heating, air is blown out from the hot plate 3 side as shown in FIG. 2C, so that one side 11 side of the foamed resin sheet 1 and the other side 12 side are formed. The foamed resin sheet 1 softened by the action of the pressure difference is brought into close contact with the molding surface 41 of the molding die 4, and a plurality of lids 20 are formed at a plurality of locations on the foamed resin sheet 1. Simultaneous molding to After releasing the mold as shown in FIG. 2D, the individual lids 2 are punched out of the foamed resin sheet 1.
この方法において、 予熱ゾー ン Aでの発泡樹脂シー ト 1 の
予熱温度はその発泡樹脂シー ト 1 のガラ ス転移点よ り低い温 度、 具体的には 5 0 で程度に してある。 また、 成形ゾー ン B での熱板 3 による発泡樹脂シー ト 1 の加熱温度は 1 0 0 〜 1 4 0 °C程度であ り、 加熱開始から成形終了までの時間は 6 秒 である。 図 2 Cで説明した発泡樹脂シー ト 1 の片面 1 1 側と 他面側 1 2 との間の差圧は 3〜 5 k gノ c m 2 である。 In this method, foaming resin sheet 1 in preheating zone A is used. The preheating temperature is set to a temperature lower than the glass transition point of the foamed resin sheet 1, specifically, about 50. The heating temperature of the foamed resin sheet 1 by the hot plate 3 in the molding zone B is about 100 to 140 ° C., and the time from the start of heating to the end of molding is 6 seconds. The differential pressure between one side 11 and the other side 12 of the foamed resin sheet 1 described in FIG. 2C is 3 to 5 kg / cm 2 .
以上説明 した方法では、 発泡樹脂シー ト 1 を用いている け れども、 発泡樹脂シー ト 1 に合成樹脂フ イ ルムを積層した積 層シー トを用いる こ と もでき る。 積層シー トは、 発泡樹脂シ — ト の厚さ力 0 . 3 〜 0 . 9 5 m mで、 合成樹脂フ イ ルムの 厚さが 1 5 〜 8 0 mである こ とが望ま しい。 合成樹脂フ ィ ルムは蓋 2 0 に印刷表示を付する こ とに役立つほか、 その蓋 2 0 を形成している発泡樹脂シー ト 1 の強度を補って割れな どを抑制する こ とにも役立つ。 In the method described above, although the foamed resin sheet 1 is used, a laminated sheet in which the synthetic resin film is laminated on the foamed resin sheet 1 can also be used. The laminated sheet preferably has a thickness of the foamed resin sheet of 0.3 to 0.95 mm and a thickness of the synthetic resin film of 15 to 80 m. The synthetic resin film is useful not only for printing on the lid 20 but also for suppressing the cracking etc. by supplementing the strength of the foamed resin sheet 1 forming the lid 20. Useful.
この方法で成形した蓋 2 0 は、 注湯調理中の保温性に優れ 排湯時に火傷を負う危険がな く なるのみな らず、 嵌合部のよ う な細部について も きめ細かく シ ャープで高精度に成形され 、 しかも量産化でき る ものとなる。 The lid 20 molded in this way has excellent heat retention during pouring and not only does not eliminate the danger of burns when draining, but also has a sharp and high-level detail, such as the fitting part. It is molded with high precision and can be mass-produced.
図 3 は、 即席食品、 具体的には "即席焼きそば " や "即席 麵" に使われる容器 1 0 と、 上述した本発明方法によって成 形された蓋 2 0 とを示している。 容器 1 0 は、 高発泡倍率 ( 1 0 倍程度) の発泡ポ リ スチ レ ン樹脂や発泡ボ リ プロ ピ レ ン 樹脂で作られている。
蓋 2 0 は、 その周縁部の嵌合用突片部 2 1 を、 容器 1 0 側 の蓋受け部 1 5 に嵌合する こ とによって容器 1 0 に装着され る。 そ して、 装着状態を確実にするために、 上記嵌合用突片 部 2 1 に係合凸条 2 2 を内向きに形成し、 こ の係合凸条 2 2 が上記蓋受け部 1 5 に係合するよう に してある。 また、 蓋 2 0 は、 上記蓋受け部 1 5 を嵌入状に収容するための中空枠部 2 3 をその外周部に膨出状に有している と共に、 その中空枠 部 2 3 の 2 つの対角 コーナ部に注排湯ゃ通気に利用される / Jヽ 開口 2 4 とそれを塞ぐための切起し片 2 5 が設けられ、 さ ら に、 内容物の商品名などを立体的に表示するための膨出部 2 6 や、 上記中空枠部 2 3 の内側片部の所定箇所に小突起 2 7 な どが設けられている。 上記した嵌合用突片部 2 1 、 係合凸 条 2 2、 中空枠部 2 3、 小突起 2 7 などは、 蓋 2 0 の細部に 相当 しており、 これらの細部がきめ細かく シャープで高精度 に成形されている。 FIG. 3 shows a container 10 used for ready-to-eat foods, specifically “quick fried noodles” or “quick 席”, and a lid 20 formed by the above-described method of the present invention. The container 10 is made of expanded polystyrene resin or expanded polypropylene resin having a high expansion ratio (about 10 times). The lid 20 is mounted on the container 10 by fitting the fitting projection 21 on the peripheral edge thereof to the lid receiving portion 15 on the container 10 side. Then, in order to ensure the mounting state, an engaging ridge 22 is formed inward on the fitting projection 21, and the engaging ridge 22 is formed on the lid receiving portion 15. It is designed to engage with. Further, the lid 20 has a hollow frame portion 23 for accommodating the lid receiving portion 15 in a fitting shape in an outer peripheral portion in a swelling shape, and the hollow frame portion 23 has two hollow frame portions. Diagonal corners are used for pouring and draining water and venting / J ヽ An opening 24 and a cut-and-raised piece 25 for closing it are provided, and the product name of the contents can be displayed in three dimensions. A bulged portion 26 for display and small protrusions 27 are provided at predetermined positions on the inner side of the hollow frame portion 23. The fitting projection 21, the engaging ridge 22, the hollow frame 23, and the small projection 27 described above correspond to the details of the lid 20, and these details are fine, sharp, and precise. It is molded into.
図 5 は上記した積層シー トを用いて本発明方法によ り成形 した蓋 2 0 の一部を示してある。 同図において、 1 は発泡樹 脂シー ト、 5 は合成樹脂フ ィ ルムである。 こ の蓋 2 0 におい て も、 嵌合用突片部 2 1 、 係合凸条 2 2、 中空枠部 2 3 、 小 突起 2 7 な どの細部がきめ細かく シャープで高精度に成形さ れている。 産業上の利用可能性
本発明による発泡樹脂成形体の熱板成形方法は、 予熱ゾ一 ンで発泡樹脂シー トゃ積層シ一 卜の他面側を加熱する こ とに よ り予熱した後、 予熱された発泡樹脂シー ト の片面側を成形 ゾー ンで加熱した後、 成形する ものであるから、 成形時に発 泡樹脂シー トの全厚部分に十分に熱が伝達している。 そのた め、 細部についても、 きめ細かく シャープで高精度の成形が 可能になるばかりでな く 、 成形のためのサイ クル時間 も短時 間になつて量産化が容易に可能になる。 FIG. 5 shows a part of the lid 20 formed by the method of the present invention using the above-described laminated sheet. In the figure, 1 is a foamed resin sheet, and 5 is a synthetic resin film. Also in this lid 20, details such as a fitting projection 21, an engagement ridge 22, a hollow frame 23, and a small projection 27 are formed with high precision and sharpness. Industrial applicability The hot plate molding method for a foamed resin molded article according to the present invention comprises the steps of: preheating a foamed resin sheet by heating the other side of the laminated sheet with a preheating zone; Since one side of the sheet is heated after being heated in the molding zone, the heat is sufficiently transmitted to the entire thickness of the foamed resin sheet during molding. Therefore, not only is it possible to form fine, sharp, and high-precision molding, but also the molding cycle time is short, and mass production can be easily performed.
そ して、 予熱ゾー ンでの予熱を遠赤外線ヒータの輻射熱で 行う よ う にする こ とによ り、 成形のためのサイ ク ル時間をさ らに短縮する こ とが可能になる。
By using the radiant heat of the far-infrared heater to perform the preheating in the preheating zone, the cycle time for molding can be further reduced.
Claims
( 1 ) 成形ゾー ンに送り込まれた発泡樹脂シー トをその成形 ゾー ンに設置された熱板と成形型との間に配備し、 その発泡 樹脂シー トの片面を上記熱板に沿わせてその発泡樹脂シー ト を片面側から加熱する と共に、 その発泡樹脂シー ト の片面側 と他面側との間に差圧を生じさせてその発泡樹脂シ一 トを上 記成形型の成形面に沿わせる こ とによ って成形する発泡樹脂 成形体の熱板成形方法において、 (1) The foamed resin sheet fed into the molding zone is placed between the hot plate installed in the molding zone and the mold, and one side of the foamed resin sheet is placed along the hot plate. The foamed resin sheet is heated from one side, and a pressure difference is generated between one side and the other side of the foamed resin sheet so that the foamed resin sheet is placed on the molding surface of the above-mentioned mold. In the hot plate molding method for a foamed resin molded article formed by
成形ゾー ンの手前に設けられた予熱ゾー ンで発泡樹脂シー トを他面側から加熱してその発泡樹脂シー トを予熱し、 予熱 した後の発泡樹脂シー トを上記成形ゾー ンに送り込む発泡樹 脂成形体の熱板成形方法。 The foamed resin sheet is heated from the other side by the preheating zone provided in front of the molding zone to preheat the foamed resin sheet, and the foamed resin sheet after the preheating is sent to the molding zone. Hot plate molding method for resin molded body.
( 2 ) 予熱ゾー ンでの発泡樹脂シー ト の加熱による予熱を、 遠赤外線ヒ一夕の輻射熱で行う請求の範囲第 1 項に記載した 発泡樹脂成形体の熱板成形方法。 (2) The hot plate molding method for a foamed resin molded article according to claim 1, wherein the preheating by heating the foamed resin sheet in the preheating zone is performed by radiant heat of far infrared rays.
( 3 ) 発泡樹脂シー ト の予熱温度がその発泡樹脂シー ト のガ ラス転移点よ り低い温度である請求の範囲第 2項に記載した 発泡樹脂成形体の熱板成形方法。 (3) The hot plate molding method for a foamed resin molded article according to claim 2, wherein the preheating temperature of the foamed resin sheet is lower than the glass transition point of the foamed resin sheet.
( 4 ) 発泡樹脂シー 卜が発泡ポリ スチ レ ン樹脂シー トである 請求の範囲第 1 項に記載した発泡樹脂成形体の熱板成形方法 (4) The hot plate molding method for a foamed resin molded article according to claim 1, wherein the foamed resin sheet is a foamed polystyrene resin sheet.
( 5 ) 発泡樹脂シー トが発泡ポ リ スチ レ ン樹脂シー ト である 請求の範囲第 2項に記載した発泡樹脂成形体の熱板成形方法
(5) The hot plate molding method for a foamed resin molded article according to claim 2, wherein the foamed resin sheet is a foamed polystyrene resin sheet.
( 6 ) 発泡樹脂シー ト の厚さ力 0 . 3 〜 0 . 9 5 m mである 請求の範囲第 4 項に記載した発泡樹脂成形体の熱板成形方法 (6) The hot plate molding method for a foamed resin molded article according to claim 4, wherein the thickness force of the foamed resin sheet is 0.3 to 0.95 mm.
( 7 ) 発泡樹脂シー トの厚さが 0 . 3 〜 0 . 9 5 m mである 請求の範囲第 5 項に記載した発泡樹脂成形体の熱板成形方法 (7) The hot plate molding method for a foamed resin molded article according to claim 5, wherein the thickness of the foamed resin sheet is 0.3 to 0.95 mm.
( 8 ) 成形ゾー ンに送り込まれた発泡樹脂シー ト と合成樹脂 フ ィ ルムとでなる積層シー トをその成形ゾー ンに設置された 熱板と成形型との間に配備し、 その積層シー トの片面を上記 熱板に沿わせてその積層シー トを片面側から加熱する と共に 、 その積層シー トの片面側と他面側との間に差圧を生じさせ てその積層シ一 トを上記成形型の成形面に沿わせる こ とによ つて成形する発泡樹脂成形体の熱板成形方法において、 成形ゾー ンの手前に設けられた予熱ゾー ンで積層シー 卜を 他面側から加熱してその積層シー トを予熱し、 予熱した後の 積層シー トを上記成形ゾー ンに送り込む発泡樹脂成形体の熱 板成形方法。
(8) A laminated sheet composed of a foamed resin sheet and a synthetic resin film fed into the molding zone is arranged between the hot plate installed in the molding zone and the molding die, and the laminated sheet is provided. The laminated sheet is heated from one side along one side of the sheet along the hot plate, and a differential pressure is generated between the one side and the other side of the laminated sheet, thereby forming the laminated sheet. In the hot plate molding method for a foamed resin molded article to be molded along the molding surface of the molding die, the laminated sheet is heated from the other side by a preheating zone provided in front of the molding zone. A hot plate molding method for a foamed resin molded article, wherein the laminated sheet is preheated and the preheated laminated sheet is sent to the molding zone.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP1996/000713 WO1997033738A1 (en) | 1996-03-15 | 1996-03-15 | Hot plate molding method for molded resin foam |
JP9509128A JP2879375B2 (en) | 1996-03-15 | 1996-03-15 | Hot plate molding method for foamed resin molded article |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP1996/000713 WO1997033738A1 (en) | 1996-03-15 | 1996-03-15 | Hot plate molding method for molded resin foam |
Publications (1)
Publication Number | Publication Date |
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WO1997033738A1 true WO1997033738A1 (en) | 1997-09-18 |
Family
ID=14153092
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1996/000713 WO1997033738A1 (en) | 1996-03-15 | 1996-03-15 | Hot plate molding method for molded resin foam |
Country Status (2)
Country | Link |
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JP (1) | JP2879375B2 (en) |
WO (1) | WO1997033738A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002331572A (en) * | 2001-05-08 | 2002-11-19 | Chisso Corp | Molding method for foamed polypropylene resin sheet, and foamed molded body |
JP2009023205A (en) * | 2007-07-19 | 2009-02-05 | Asano Laboratories Co Ltd | Thermoforming device and thermoforming method |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6332610B2 (en) * | 1978-09-15 | 1988-06-30 | Mobil Oil | |
JPS6338060B2 (en) * | 1982-05-11 | 1988-07-28 | Sekisui Plastics | |
JPH0554810B2 (en) * | 1988-06-30 | 1993-08-13 | Sekisui Plastics |
-
1996
- 1996-03-15 JP JP9509128A patent/JP2879375B2/en not_active Expired - Lifetime
- 1996-03-15 WO PCT/JP1996/000713 patent/WO1997033738A1/en unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6332610B2 (en) * | 1978-09-15 | 1988-06-30 | Mobil Oil | |
JPS6338060B2 (en) * | 1982-05-11 | 1988-07-28 | Sekisui Plastics | |
JPH0554810B2 (en) * | 1988-06-30 | 1993-08-13 | Sekisui Plastics |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002331572A (en) * | 2001-05-08 | 2002-11-19 | Chisso Corp | Molding method for foamed polypropylene resin sheet, and foamed molded body |
JP2009023205A (en) * | 2007-07-19 | 2009-02-05 | Asano Laboratories Co Ltd | Thermoforming device and thermoforming method |
Also Published As
Publication number | Publication date |
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JP2879375B2 (en) | 1999-04-05 |
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