JPH02185419A - Manufacture of thin wall injection molded product - Google Patents
Manufacture of thin wall injection molded productInfo
- Publication number
- JPH02185419A JPH02185419A JP32752688A JP32752688A JPH02185419A JP H02185419 A JPH02185419 A JP H02185419A JP 32752688 A JP32752688 A JP 32752688A JP 32752688 A JP32752688 A JP 32752688A JP H02185419 A JPH02185419 A JP H02185419A
- Authority
- JP
- Japan
- Prior art keywords
- label
- mold
- plastic material
- cavity
- groove
- 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
- 238000002347 injection Methods 0.000 title claims abstract description 4
- 239000007924 injection Substances 0.000 title claims abstract description 4
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 239000000463 material Substances 0.000 claims abstract description 25
- 239000004033 plastic Substances 0.000 claims abstract description 21
- 229920003023 plastic Polymers 0.000 claims abstract description 21
- 229920001169 thermoplastic Polymers 0.000 claims description 14
- 239000004416 thermosoftening plastic Substances 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 9
- 238000001746 injection moulding Methods 0.000 claims description 6
- 238000000465 moulding Methods 0.000 abstract description 12
- 239000000835 fiber Substances 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 abstract description 3
- 239000012815 thermoplastic material Substances 0.000 abstract description 3
- 239000004698 Polyethylene Substances 0.000 abstract description 2
- -1 polyethylene Polymers 0.000 abstract description 2
- 229920000573 polyethylene Polymers 0.000 abstract description 2
- 238000005266 casting Methods 0.000 abstract 2
- 230000001070 adhesive effect Effects 0.000 abstract 1
- 238000010030 laminating Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000004014 plasticizer Substances 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 230000008602 contraction Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C2045/1486—Details, accessories and auxiliary operations
- B29C2045/14893—Preventing defects relating to shrinkage of inserts or coating material
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野］
本発明は射出成形機において冷却中熱可塑材とは異なる
収縮性を有するラベルを貼った薄壁熱可塑物を製造する
方法に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for producing labeled thin-walled thermoplastics that have a different shrinkage property than the thermoplastic during cooling in an injection molding machine.
（従来の技術、発明が解決しようとする課題）例えば熱
可塑材からなる容器蓋の射出成形が完了して祇ラベルが
蓋の上側に付けられた場合、冷えるに従って蓋は収縮す
る一方ラベルは収縮しない、特にラベルが蓋の大部分を
カバーしている場合、収縮性が異なるため、蓋とラベル
との間で歪みが発生し、蓋が変形したりラベルの接着性
が低下する。この変形及び接着性の低下により、蓋は取
扱いにくく、被せにくくなり、ラベルが蓋から取れてし
まうことがある。(Prior art, problem to be solved by the invention) For example, when injection molding of a container lid made of thermoplastic material is completed and a label is attached to the top of the lid, the lid shrinks as it cools, while the label shrinks. No, especially if the label covers a large portion of the lid, the differential shrinkage will cause distortion between the lid and the label, deforming the lid and reducing label adhesion. This deformation and reduced adhesion make the lid difficult to handle and put on, and the label may come off the lid.
本発明の目的の一つは、上記欠点を排除し、変形及び接
着性の点で最終製品の品質を改良するような薄壁射出成
形物の製造方法を提供することにある。One of the objects of the invention is to provide a method for producing thin-walled injection moldings which eliminates the above-mentioned drawbacks and improves the quality of the final product in terms of deformation and adhesion.
この目的は特許請求の範囲の特徴を述べる部分に開示し
た特徴を有する発明によって達成することができる。This object can be achieved by the invention having the features disclosed in the characterizing part of the claims.
即ち、実質的に平坦で冷却中熱可塑材とは異なる収縮率
を有するラベル５が２つの半鋳型１゜２の間に供給され
、その内の少なくとも一つの半鋳型１は他方の半鋳型２
に向かって移動せしめられて可塑物を成形する鋳型空隙
３が定められ、可塑物８は曲面を描きラベル５は可塑物
の曲面に対応するように成形される一方、ラベル５は可
塑物の曲面に貼付されるようにすることで上記目的を達
成することができる。That is, a label 5 which is substantially flat and has a shrinkage rate different from that of the thermoplastic during cooling is fed between two half-molds 1.2, of which at least one half-mold 1 is connected to the other half-mold 2.
A mold cavity 3 for molding the plastic material is defined, and the plastic material 8 forms a curved surface and the label 5 is molded to correspond to the curved surface of the plastic material. The above purpose can be achieved by affixing the tag to the .
実質的に平坦で冷却中熱可塑材とは異なる収縮率を有す
るラベル５ば２つの半鋳型１． ２の間に供給される。Two half molds 1. Label 5 which is substantially flat and has a different shrinkage rate than the thermoplastic during cooling. 2.
その後２つの半鋳型の内の少くとも１つの半鋳型１を他
方の半鋳型２に向って移動せしめる。すると、半鋳型１
，２間において可塑物を成形する鋳型空隙３が形成され
る。Thereafter, at least one of the two half-molds 1 is moved towards the other half-mold 2. Then, half mold 1
, 2, a mold cavity 3 for molding the plastic material is formed.
そして、紙ラベル５をこの鋳型空隙３に置いた状態で熱
い熱可塑材を射出すると、その間ラベルは半鋳型１の成
形面に押さえ付けられるが、可塑材が凝固するとラベル
はその曲面に対応するようなほぼ同じ形に成形される一
方、ラベル５は可塑物の曲面に貼付されることになる。Then, when hot thermoplastic material is injected with the paper label 5 placed in the mold cavity 3, the label is pressed against the molding surface of the half mold 1, but when the plastic material solidifies, the label conforms to the curved surface. The label 5 will be attached to the curved surface of the plastic material.
この場合において、可塑物は曲面を有しているため、比
較的形状が安定しており、変形率は非常に小さい、冷却
中収縮が発生すると可塑物の曲率が増加し、これにより
形状はさらに安定し、変形を少なくする。可塑物の外部
に貼付したラベルは冷却中収縮しないため、補強材とし
て働き、可塑材をコントロールしながら収縮させる。In this case, since the plastic material has a curved surface, the shape is relatively stable and the deformation rate is very small. When shrinkage occurs during cooling, the curvature of the plastic material increases, which further reduces the shape. Stable and reduces deformation. Labels attached to the outside of the plastic material do not shrink during cooling, so they act as reinforcement and cause the plastic material to shrink in a controlled manner.
なお、鋳型空隙３の中において可塑材の凝固が終了する
と、半鋳型１．２は互いに離れ、ラベルを貼った可塑物
が排出される。In addition, when the solidification of the plastic material in the mold cavity 3 is completed, the mold halves 1.2 are separated from each other and the labeled plastic material is discharged.
〔実施例］
第１図は本発明の方法を実施するための装置に含まれる
射出成形機の一例の詳細のみを主に図示した。成形機は
２つの半鋳型１．２を含み、その一方は他方の半鋳型２
に対して移動可能となっている。半鋳型１，２が第１図
で示す位置にある時、互いに相対向するそれらの成形面
ｌａ、 ２ａによって鋳型空隙３が定められ、祇ラベル
を鋳型空隙３に置いた状態で熱い液体熱可塑材を半鋳型
２のノズル４を介して射出する。[Example] FIG. 1 mainly shows details of an example of an injection molding machine included in an apparatus for carrying out the method of the present invention. The molding machine includes two half-molds 1.2, one of which is connected to the other half-mold 2.
It is possible to move against. When the mold halves 1, 2 are in the position shown in Figure 1, a mold cavity 3 is defined by their molding surfaces la, 2a facing each other, and with the label placed in the mold cavity 3, hot liquid thermoplastic The material is injected through the nozzle 4 of the mold half 2.
ラベル５は半鋳型１が半鋳型２から離れている時、平坦
な状態で半鋳型ｌに固定された溝６の中へ供給される。When the mold half 1 is separated from the mold half 2, the label 5 is fed in a flat state into a groove 6 fixed to the mold half l.
ラベルが溝の中を″落下し、溝の底６ａに到達し、成形
面１ａのちょうど反対側にある時、半鋳型ｌの中に配置
された真空弁７が満６から鋳型空隙３の辺りに移動する
ごとく作動し、半鋳型１が半鋳型２に向かって移動せし
められるまでラベルを保持する。When the label "falls down" into the groove and reaches the bottom 6a of the groove, just opposite the molding surface 1a, a vacuum valve 7 arranged in the half-mold 1 is opened from 6 to around the mold cavity 3. The label is held until half-mold 1 is moved toward half-mold 2.
半鋳型ｌが鋳型空隙３を形成するために半鋳型２と接触
するまで移動した後、ポリエチレンのような液体熱可塑
材がノズル４を介して該空隙３に射出され、真空弁７は
作動しない状態となる。射出の間、ラベルは成形面１ａ
に押さえ付けられるが、可塑材が凝固する際に可塑材と
ラベルの繊維との間に接着が発生するように鋳型空隙３
を満たし繊維に含浸する可塑材によりラベルの形が作ら
れる。鋳型空隙３の中において可塑材の凝固が終了する
と、半鋳型ｌば半鋳型２から離れ、完成した１８が排出
される。After the mold half l has moved until it comes into contact with the mold half 2 to form a mold cavity 3, a liquid thermoplastic such as polyethylene is injected into said cavity 3 through the nozzle 4 and the vacuum valve 7 is not actuated. state. During injection, the label is placed on the molding surface 1a
mold cavity 3 so that adhesion occurs between the plasticizer and the label fibers as the plasticizer solidifies.
The shape of the label is created by filling the plastic material and impregnating the fibers. When the solidification of the plastic material in the mold cavity 3 is completed, the half mold 1 is separated from the half mold 2 and the completed mold 18 is discharged.
第１図に示すように、成形面１ａ、２ａは環状領域Ｘで
曲面を描（、これらの領域の幅は成形物及びラベルの形
及び寸法により異なるが、実質的に成形面全体にわたる
ことがある。但し、真空弁７及びノズル４が配置された
小さな中央部、及び成形面１ａ＋ ２ａの外端にある狭
巾の環状領域を除く。As shown in Fig. 1, the molding surfaces 1a and 2a are curved surfaces with an annular region However, the small central part where the vacuum valve 7 and nozzle 4 are arranged, and the narrow annular area at the outer end of the molding surface 1a+2a are excluded.
第１図に示す鋳型空隙３は該空隙で作られ第２図及び第
３図に示す蓋８とほぼ同じ形で、ラベル５が貼付される
面が設けられ、蓋全体の周囲に伸びて容器（図示されな
い）の環状開口端を囲むように意図された溝を形成する
Ｕ型端フランジ１０を有する。第２図及び第３図かられ
かるように、蓋の面９は端フランジ１０と蓋の中央部と
の間の環状領域において曲面を描く。The mold cavity 3 shown in FIG. 1 is formed by the cavity and has a shape substantially the same as the lid 8 shown in FIGS. It has a U-shaped end flange 10 forming a groove intended to surround the annular open end of the (not shown). As can be seen in FIGS. 2 and 3, the surface 9 of the lid is curved in the annular region between the end flange 10 and the center of the lid.
その曲率は冷却中の可塑材の収縮により、成形面１ａ、
２ａの領域Ｘの曲率よりやや大きい。The curvature of the molding surface 1a is changed due to the contraction of the plastic material during cooling.
The curvature is slightly larger than the curvature of region X in 2a.
蓋８は曲面を有しているため、比較的形状が安定してお
り、変形率は非常に小さい、冷却中収縮が発生すると蓋
の曲率が増加し、これにより形状はさらに安定し、変形
を少なくする。蓋の外部に貼付したラベルは冷却中収縮
しないため、補強材として働き、可塑材をコントロール
しながら収縮させる。即ちラベルから離れた領域におい
ては収縮率が大きく、これが蓋の曲率を増加させる。Since the lid 8 has a curved surface, the shape is relatively stable and the deformation rate is very small. When shrinkage occurs during cooling, the curvature of the lid increases, which makes the shape more stable and prevents deformation. Reduce. The label attached to the outside of the lid does not shrink during cooling, so it acts as a reinforcement and allows the plastic material to shrink in a controlled manner. That is, the shrinkage rate is greater in the region away from the label, which increases the curvature of the lid.
本発明は上記説明及び図面に描いたものに限定されるも
のではなく、上記の記述は特許請求の範囲に記載された
発明の一例を開示したに過ぎない。The present invention is not limited to what is depicted in the above description and drawings, and the above description discloses only one example of the invention as claimed.
本発明の方法を用いて熱可塑材とは異なる収縮性を有す
るラベルを貼った薄壁熱可塑物を製造した場合には、薄
壁熱可塑物とラベルとの間で歪が発生することがないか
ら、薄壁熱可塑物が変形したりラベルの接着性の低下に
よりラベルが取れることがないという効果がある。従っ
て、薄壁熱可塑物が容器の蓋である場合、いつまでも取
扱いやすくかつ被せやすいものとなる。When the method of the present invention is used to produce a thin-walled thermoplastic with a label that has a shrinkage property different from that of the thermoplastic, distortion may occur between the thin-walled thermoplastic and the label. This has the effect that the label will not come off due to deformation of the thin-walled thermoplastic or a decrease in the adhesiveness of the label. Therefore, when a thin-walled thermoplastic is used as a lid for a container, it remains easy to handle and put on.
第１図は、蓋を射出成形するに当り本発明の方法を実施
するための装置の一例を示す断面図で、蓋にラベルを付
けた状態を示す、第２図は、第１図に示す装置により成
形されたラベル付の蓋の平面図、
第３図は、第２図の■−■線に沿った部分図、である。
１．２−ｍ−半鋳型、 ３−鋳型空隙、 ５−ラベル、
８−薄壁熱可塑物（蓋）。FIG. 1 is a sectional view showing an example of an apparatus for carrying out the method of the present invention for injection molding a lid, and shows the lid with a label attached thereto. FIG. FIG. 3 is a plan view of the labeled lid formed by the apparatus; FIG. 3 is a partial view taken along the line ■-■ in FIG. 2; 1.2-m-half mold, 3-mold void, 5-label,
8 - Thin-walled thermoplastic (lid).
Claims (1)
であって、実質的に平坦で冷却中熱可塑材とは異なる収
縮率を有するラベル５が２つの半鋳型１、２の間に供給
され、その内の少なくとも一つの半鋳型１は他方の半鋳
型２に向かって移動せしめられて可塑物を成形する鋳型
空隙３が定められ、可塑物８は曲面を描きラベル５は可
塑物の曲面に対応するように成形される一方、ラベル５
は可塑物の曲面に貼付されることを特徴とする薄壁射出
成形物の製造方法。1. A method for producing a thin-walled thermoplastic 8 in an injection molding machine, wherein a label 5 which is substantially flat and has a different shrinkage rate than the thermoplastic during cooling is placed between two half molds 1, 2. At least one of the mold halves 1 is moved towards the other mold half 2 to define a mold cavity 3 for forming the plastic material, the plastic material 8 forms a curved surface, and the label 5 forms a curved surface of the plastic material. While being molded to accommodate curved surfaces, the label 5
A method for producing a thin-walled injection molded product, which is characterized in that the product is pasted onto a curved surface of a plastic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32752688A JPH02185419A (en) | 1988-12-23 | 1988-12-23 | Manufacture of thin wall injection molded product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32752688A JPH02185419A (en) | 1988-12-23 | 1988-12-23 | Manufacture of thin wall injection molded product |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02185419A true JPH02185419A (en) | 1990-07-19 |
Family
ID=18200088
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32752688A Pending JPH02185419A (en) | 1988-12-23 | 1988-12-23 | Manufacture of thin wall injection molded product |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02185419A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1568459A1 (en) * | 2004-02-25 | 2005-08-31 | Arta Plast Ab | Method of manufacturing container lids |
-
1988
- 1988-12-23 JP JP32752688A patent/JPH02185419A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1568459A1 (en) * | 2004-02-25 | 2005-08-31 | Arta Plast Ab | Method of manufacturing container lids |
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