JPS62246710A - Injection molding of foamed resin - Google Patents
Injection molding of foamed resinInfo
- Publication number
- JPS62246710A JPS62246710A JP26446485A JP26446485A JPS62246710A JP S62246710 A JPS62246710 A JP S62246710A JP 26446485 A JP26446485 A JP 26446485A JP 26446485 A JP26446485 A JP 26446485A JP S62246710 A JPS62246710 A JP S62246710A
- Authority
- JP
- Japan
- Prior art keywords
- cavity
- mold
- injection molding
- movable mold
- injection
- 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.)
- Pending
Links
- 238000001746 injection moulding Methods 0.000 title claims abstract description 25
- 229920005989 resin Polymers 0.000 title claims abstract description 15
- 239000011347 resin Substances 0.000 title claims abstract description 15
- 238000002347 injection Methods 0.000 claims abstract description 19
- 239000007924 injection Substances 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 17
- 239000006260 foam Substances 0.000 claims abstract description 9
- 239000006261 foam material Substances 0.000 claims description 24
- 230000035622 drinking Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000919 ceramic Substances 0.000 claims description 2
- 230000005484 gravity Effects 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000005187 foaming Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 235000015429 Mirabilis expansa Nutrition 0.000 description 1
- 244000294411 Mirabilis expansa Species 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 235000013536 miso Nutrition 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 235000014347 soups Nutrition 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/58—Moulds
- B29C44/585—Moulds with adjustable size of the mould cavity
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
この発明は、例えばコーヒーやみそ汁の自動販売機など
に用いられる発泡成形された水飲み容器の製造に好適な
発泡樹脂の射出成形方法に関するものである。[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a method for injection molding a foamed resin suitable for manufacturing foam-molded drinking containers used, for example, in coffee and miso soup vending machines. .
合成樹脂材の射出成形は半溶融状態の樹脂を高圧で金型
のキャビティ内へ注入するもので、生産製が高く、美麗
な製品表面が得られるものである反面、この高い射出圧
力のため発泡樹脂を成形せんとすると、樹脂内の気体が
圧縮されてしまい発泡体の特性が失われてしまい、また
、射出圧力を低下させれば発泡材をキャビティの隅々ま
で充填することが困難となる不具合がある。そのため、
従来、発泡材からなる水飲み容器はシート状の発泡材料
をホットプレスその他で成形して製造している。Injection molding of synthetic resin materials involves injecting semi-molten resin into the cavity of a mold under high pressure.While production is high and a beautiful product surface can be obtained, this high injection pressure causes foaming. If you try to mold the resin, the gas inside the resin will be compressed and the foam will lose its properties, and if the injection pressure is lowered, it will be difficult to fill every corner of the cavity with the foam material. There is a problem. Therefore,
Conventionally, drinking containers made of foamed material have been manufactured by molding a sheet of foamed material using a hot press or other means.
第１発明は発泡材料の射出成形時にキャビティ内へ印加
される射出圧力を低めて、射出時に生じる発泡材の収縮
を可及的に抑制し、且つキャビティ内への発泡材の完全
充填を目的とするもので、射出成形機の射出口に結合さ
れる成形型を固定型とその固定型に対して進退する可動
型とで構成し、それらの間に形成されるキャビティを可
動型の進退によって拡大縮小可能となし、射出成形機か
ら成形型内へ発泡材が射出される以前に可動型を進出さ
せてキャピテイを縮小させ、発泡材の射出とほぼ同時に
可動型を後退させてキャビティを所定の大きさまで拡大
することを特徴とする。The first invention aims to reduce the injection pressure applied to the cavity during injection molding of the foam material, to suppress the shrinkage of the foam material that occurs during injection as much as possible, and to completely fill the cavity with the foam material. The mold connected to the injection port of the injection molding machine consists of a fixed mold and a movable mold that moves forward and backward relative to the fixed mold, and the cavity formed between them is expanded by moving the movable mold back and forth. The movable mold is advanced to reduce the cavity before the foam is injected into the mold from the injection molding machine, and the movable mold is retreated almost simultaneously with the injection of the foam to reduce the cavity to a predetermined size. It is characterized by expanding.
第２発明はキャビティを可動型の進退によって拡大縮小
し、発泡材をキャビティのすみずみまで充填させる際、
キャビティ内に残留する微量な空気が発泡材の充填を妨
げることがないようにすることを目的とするもので、射
出成形機の射出口に結合される成形型を固定型とその固
定型に対して進退する可動型とを設け、それらの間に形
成されるキャビティを可動型の進退によって拡大縮小可
能となし、射出成形機から成形型内へ発泡材が射出され
るとき可動型を後退させてキャビティを所定の大きさま
で拡大させ、次いで僅かにキャビティを縮小して発泡材
を加圧するものにおいて、前記キャビティの壁面を多孔
質物質で構成した点に特徴がある。The second invention expands and contracts the cavity by advancing and retracting the movable mold, and when filling the foam material to every corner of the cavity,
The purpose is to prevent the slight amount of air remaining in the cavity from interfering with the filling of the foam material. A movable mold that moves forward and backward is provided, and the cavity formed between them can be expanded and contracted by moving the movable mold forward and backward, and when the foam material is injected from the injection molding machine into the mold, the movable mold is moved back. The cavity is enlarged to a predetermined size, and then the cavity is slightly reduced to pressurize the foam material.The feature is that the wall surface of the cavity is made of a porous material.
第１発明によれば、射出成形機から成形型内へ発泡材が
射出されるとき、キャビティ内が拡大して、射出された
発泡材をキャビティ内へ吸引するから低い射出圧力によ
ってもキャビティ内を発泡材で充填することが出来る。According to the first invention, when the foam material is injected from the injection molding machine into the mold, the inside of the cavity expands and the injected foam material is sucked into the cavity. Can be filled with foam material.
第２発明によれば、キャビティの縮小によって隅々まで
発泡材を充填させる際、キャビティ内に空気が残ってい
ても、加圧されたとき多孔質からなるキャビティの壁面
から外部へ放出され、発泡材がキャビティを隅々まで充
填することの妨げになることがない。According to the second invention, when the cavity is reduced to fill every corner with the foaming material, even if air remains in the cavity, when pressurized, it is released from the porous walls of the cavity to the outside, causing the foam to form. The material does not interfere with filling the cavity to every corner.
以下、図示の実施例によってこの発明を説明する。第１
図は装置の概要を示すもので、ｌは射出成形機であり、
そこには素材たるペレットの容器１ａから、加熱部１ｂ
を経た半溶融状態の合成樹脂が射出部１ｃへ供給され、
そこで発泡部１ｄから供給される空気或いは発泡液を混
合して、射出口１ｅから成形型２内へ発泡材Ｂを圧送す
る。The present invention will be explained below with reference to illustrated embodiments. 1st
The figure shows the outline of the equipment, l is an injection molding machine,
There, there is a container 1a for the pellet material, a heating section 1b.
The synthetic resin in a semi-molten state after passing through is supplied to the injection part 1c,
Thereupon, the air or foaming liquid supplied from the foaming section 1d is mixed, and the foamed material B is pumped into the mold 2 from the injection port 1e.
成形型２は固定型３とその固定型３に対して進退する可
動型４とで構成され、それらの間にキャビティ５が形成
される。なお、このキャビティ５は水飲み容器６（コツ
プ）のものである。固定型３は水飲み容器６の外面を形
成する四部３ａと、可動型４の案内部３ｂとを有する。The mold 2 is composed of a fixed mold 3 and a movable mold 4 that moves forward and backward relative to the fixed mold 3, and a cavity 5 is formed between them. Note that this cavity 5 is for a drinking container 6 (cotup). The fixed mold 3 has four parts 3a forming the outer surface of the drinking container 6, and a guide part 3b of the movable mold 4.
３ｃは前記射出口１ｅへ連結される樹脂通路、３ｄは製
品の型離れをよくするための空気挿入口である。可動型
４は水飲み容器６の内面を形成する凸部４ａと、前記案
内部３ｂへ精密に遊合する円筒部４ｂとを有する。７は
前記可動型４を支持する基板であり、円筒部４ｂが嵌合
する案内部７ａと可動型４を進退させるクランク機構８
が支持されている。クランク機構８はクランク腕８ａを
有しパルスモータで駆動されるクランク軸８ｂと、クラ
ンク腕８ａｓ可動型４の間を連結する連接棒８Ｇとから
なっている。なお、固定型３と可動型４とは若干の通気
性を保持するのが好ましく、第２図で示すように、比重
が約４．８の鉄系焼結合金やセラミック或いはアルマイ
ト等が用いられるが、その通気性は実験的に求められる
。3c is a resin passage connected to the injection port 1e, and 3d is an air insertion port for improving mold release of the product. The movable mold 4 has a convex portion 4a that forms the inner surface of the drinking container 6, and a cylindrical portion 4b that precisely fits into the guide portion 3b. Reference numeral 7 denotes a substrate that supports the movable mold 4, and a crank mechanism 8 that advances and retreats the movable mold 4 and a guide portion 7a into which the cylindrical portion 4b is fitted.
is supported. The crank mechanism 8 includes a crank shaft 8b having a crank arm 8a and driven by a pulse motor, and a connecting rod 8G connecting the crank arm 8as and the movable type 4. It is preferable that the fixed mold 3 and the movable mold 4 maintain some air permeability, and as shown in Fig. 2, iron-based sintered alloy, ceramic, alumite, etc. with a specific gravity of about 4.8 are used. However, its breathability is determined experimentally.
次に、この装置の作動を説明すると、まず、可動型４は
基板７によって大きく後退して第３図（ａｌで示すよう
に、キャビティ５を開いている。次ぎに基板７が前進し
て可動型４は固定型３と合体する。このときクランク軸
８ｂが可動型４を前進端に移動させ、同図…）で示すよ
うに、キャビティ５は最少に縮小している。この状態か
ら射出成形が開始する。キャビティ５内には樹脂通路４
ｃから発泡材Ｂが注入され、これと同期してクランク軸
８ｂが回転し、同図（Ｃ１で示すようにキャビティ５を
最大限に拡大するので内部の圧力が低下し、発泡材が内
部へ吸引される。このときの発泡材の単位時間当たりの
射出量はキャビティ５が拡大する速度と略等しく設定さ
れている０発泡材Ｂの射出が終了した後、同図１ｄｌで
示すようにクランク軸８ｂが回転し、キャビティ５を若
干縮小して内部に充填された発泡材を加圧し、発泡材の
気泡の大きさを整えると共に、発泡材を隅々まで充填し
て水飲み容器６の外形を浮き出し、文字などを含めて精
密に成形する。このとき、キャビティ５の壁面は多孔質
物質からなっているので、キャビティ５内に空気が残存
していても、直ちにキャビティ５の壁面を通して外部へ
放出され、発泡付充填の妨げとなることはない。なお、
この工程は製品が精密でなくともよいときには必須では
ない、成形が終了した後、空気挿入口４ｄから水飲み容
！３６の外面へ空気を圧送しつ一２基板７を後退させ成
形型２を開いて製品たる水飲み容器６を可動型４から取
外し初期の状態へ復帰するものである。Next, to explain the operation of this device, first, the movable mold 4 is moved back greatly by the substrate 7 to open the cavity 5, as shown in FIG. The mold 4 is combined with the fixed mold 3. At this time, the crankshaft 8b moves the movable mold 4 to the forward end, and the cavity 5 is reduced to the minimum size as shown in the figure (...). Injection molding starts from this state. There is a resin passage 4 in the cavity 5.
Foaming material B is injected from c, and the crankshaft 8b rotates in synchronization with this, expanding the cavity 5 to the maximum as shown in the same figure (C1), so the internal pressure decreases, and the foaming material flows inside. At this time, the injection amount of the foam material per unit time is set to be approximately equal to the speed at which the cavity 5 expands. After the injection of the foam material B is completed, the crankshaft is 8b rotates to slightly reduce the cavity 5 and pressurize the foam material filled inside, adjust the size of the bubbles in the foam material, and fill the foam material to every corner to highlight the outer shape of the drinking container 6. , letters, etc. At this time, since the wall surface of the cavity 5 is made of a porous material, even if air remains inside the cavity 5, it is immediately released to the outside through the wall surface of the cavity 5. , does not interfere with foam filling.
This step is not essential if the product does not need to be precise. After the molding is completed, the water can be poured from the air inlet 4d! While air is forced to the outer surface of the mold 36, the two substrates 7 are moved back, the mold 2 is opened, and the drinking container 6, which is the product, is removed from the movable mold 4 and returned to its initial state.
以上のように第１発明は、射出成形機の射出口に結合さ
れる成形型のキャビティを可動型の進退によって拡大縮
小可能となし、発泡材が射出される以前にキャビティを
縮小させ、発泡材の射出とほぼ同時に可動型を後退させ
てキャビティを所定の大きさまで拡大するものであるか
ら、低い射出圧力によってもキャビティ内を発泡材で充
填することが出来る。よって、発泡材を射出成形して製
品を成形することが出来る効果がある。As described above, the first invention enables the cavity of the mold connected to the injection port of the injection molding machine to be enlarged and contracted by moving the movable mold forward and backward, and reduces the cavity before the foam is injected. Since the movable mold is moved back almost simultaneously with the injection of foam to expand the cavity to a predetermined size, the inside of the cavity can be filled with the foam material even with low injection pressure. Therefore, there is an effect that a product can be molded by injection molding the foam material.
第２発明は、キャビティの壁面を多孔物質で形成したか
ら、キャビティ内へ注入された発泡材を再加圧するとき
、キャビティ内の残留空気を容易に除去して、発泡材を
キャビティ内の隅々まで充填させるという目的を達成で
きる効果がある。The second invention is that since the wall surface of the cavity is formed of a porous material, when the foam material injected into the cavity is repressurized, the residual air in the cavity can be easily removed, and the foam material can be poured into every corner of the cavity. This has the effect of achieving the purpose of filling up to 100%.
図面はこの発明の一実施例を示すものであり、第１図は
装置の概要を示す構造図、第２図はそのｎ−ｎ断面を拡
大して示す拡大断面図、第３図は製造工程を示す工程図
である。
１−射出成形機、 ２−成形型、
３− 固定型、 ４−・可動型、５・−キャ
ビティ、・ ６・−・−水飲み容器、７・一基板、
−７ａ−案内部、
８−クランク１１１構、８ａ−・−クランク腕、特許出
願人 東海プラスチック株式会社ＬＪＪ
日
Ｏ
派
手続補正書動式）
昭和６２年 ５月ｌ１日
特許庁長官 黒 １）明 雄 殿
同
１、特許出願の表示
昭和６０年特許願第２６４４６４号
２、発明の名称
発泡樹脂の射出成形方法
３、補正をする者
事件との関係 特許出願人
住所 〒４３１−１４静岡県引佐郡三ケ日町都築１１７
２の７昭和６２年３月３１日（発送日同年４月２８日）
５、補正の対象
願書、および図面の第３図。
６、補正の内容The drawings show one embodiment of the present invention, and FIG. 1 is a structural diagram showing an outline of the device, FIG. 2 is an enlarged sectional view showing an enlarged nn cross section, and FIG. 3 is a manufacturing process. FIG. 1-Injection molding machine, 2-Molding mold, 3-Fixed mold, 4-Movable mold, 5-Cavity, 6--Drinking container, 7-One board,
-7a-guide section, 8-crank 111 structure, 8a--crank arm, patent applicant Tokai Plastics Co., Ltd. Yu Tono 1, Indication of patent application 1985 Patent Application No. 264464 2, Name of the invention Injection molding method for foamed resin 3, Relationship with the case of the person making the amendment Patent applicant address 431-14 Inasa District, Shizuoka Prefecture 117 Tsuzuki, Mikkabimachi
2-7 March 31, 1986 (shipment date April 28 of the same year)
5. The application to be amended and Figure 3 of the drawings. 6. Contents of correction
Claims (6)
とその固定型に対して進退する可動型とで構成し、それ
らの間に形成されるキャビティを可動型の進退によって
拡大縮小可能となし、射出成形機から成形型内へ発泡材
が射出される以前に可動型を進出させてキャビティを縮
小させ、発泡材の射出とほぼ同時に可動型を後退させて
キャビティを所定の大きさまで拡大する発泡樹脂の射出
成形方法。(1) The mold connected to the injection port of the injection molding machine is composed of a fixed mold and a movable mold that moves forward and backward relative to the fixed mold, and the cavity formed between them is expanded and contracted by moving the movable mold back and forth. The movable mold is advanced to reduce the cavity before the foam material is injected from the injection molding machine into the mold, and the movable mold is retreated almost simultaneously with the injection of the foam material to reduce the cavity to the predetermined size. Expanding foam resin injection molding method.
成される水飲み容器の雌型をなしている特許請求の範囲
第１項記載の発泡樹脂の射出成形方法。(2) The method of injection molding a foamed resin according to claim 1, wherein the cavity forms a female mold of a drinking container formed by one fixed mold and one movable mold.
ぼ合致させて行う特許請求の範囲第１項記載の発泡樹脂
の射出成形方法。(3) A method for injection molding a foamed resin according to claim 1, which is carried out by substantially matching the expansion speed of the cavity and the injection speed of the foamed material.
とその固定型に対して進退する可動型とで構成し、それ
らの間に形成されるキャビティを可動型の進退によって
拡大縮小可能となし、射出成形機から成形型内へ発泡材
が射出されるとき可動型を後退させてキャビティを所定
の大きさまで拡大させ、次いで僅かにキャビティを縮小
して発泡材を加圧するものにおいて、前記キャビティの
壁面が多孔質物質で構成されている発泡樹脂の射出成形
方法。(4) The mold connected to the injection port of the injection molding machine is composed of a fixed mold and a movable mold that moves forward and backward relative to the fixed mold, and the cavity formed between them is enlarged and contracted by moving the movable mold back and forth. When the foam material is injected from the injection molding machine into the mold, the movable mold is moved back to expand the cavity to a predetermined size, and then the cavity is slightly contracted to pressurize the foam material. A method for injection molding a foamed resin, wherein the wall surface of the cavity is made of a porous material.
特許請求の範囲第１項記載の発泡樹脂の射出成形方法。(5) The method for injection molding a foamed resin according to claim 1, wherein the porous material is an iron-based sintered alloy with a specific gravity of about 4.8.
第１項記載の発泡樹脂の射出成形方法。(6) The method for injection molding a foamed resin according to claim 1, wherein the porous material is ceramic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26446485A JPS62246710A (en) | 1985-11-25 | 1985-11-25 | Injection molding of foamed resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26446485A JPS62246710A (en) | 1985-11-25 | 1985-11-25 | Injection molding of foamed resin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62246710A true JPS62246710A (en) | 1987-10-27 |
Family
ID=17403576
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26446485A Pending JPS62246710A (en) | 1985-11-25 | 1985-11-25 | Injection molding of foamed resin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62246710A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6245263B1 (en) | 1996-09-13 | 2001-06-12 | Chisso Corporation | Process of injection molding a foamable plastic composition |
| US7704423B2 (en) | 2002-02-28 | 2010-04-27 | Ube Machinery Corporation, Ltd. | Method for expansion injection molding |
-
1985
- 1985-11-25 JP JP26446485A patent/JPS62246710A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6245263B1 (en) | 1996-09-13 | 2001-06-12 | Chisso Corporation | Process of injection molding a foamable plastic composition |
| US7704423B2 (en) | 2002-02-28 | 2010-04-27 | Ube Machinery Corporation, Ltd. | Method for expansion injection molding |
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