JPH0317660B2 - - Google Patents
Info
- Publication number
- JPH0317660B2 JPH0317660B2 JP1299586A JP1299586A JPH0317660B2 JP H0317660 B2 JPH0317660 B2 JP H0317660B2 JP 1299586 A JP1299586 A JP 1299586A JP 1299586 A JP1299586 A JP 1299586A JP H0317660 B2 JPH0317660 B2 JP H0317660B2
- Authority
- JP
- Japan
- Prior art keywords
- side chamber
- hydraulic circuit
- hydraulic
- injection
- cylinder
- 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.)
- Expired
Links
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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
- B29C45/50—Axially movable screw
- B29C45/5008—Drive means therefor
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、射出成形機の油圧回路に係り、特に
射出工程後、加熱シリンダ内に樹脂等の可塑化原
料をチヤージ工程の完了直後にスクリユを強制後
退させる所謂「サツクバツク」ための油圧回路を
有する射出成形機の油圧回路の改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hydraulic circuit for an injection molding machine, and particularly relates to a hydraulic circuit for an injection molding machine, and in particular to a method for discharging plasticizing raw materials such as resin into a heating cylinder immediately after the completion of a charging process after an injection process. This invention relates to an improvement in the hydraulic circuit of an injection molding machine having a hydraulic circuit for so-called "success back" for forcibly retracting the machine.
一般に射出成形機では、前段階の射出工程後、
スクリユを内蔵する加熱シリンダ内に樹脂を充填
する工程（以下、単にチヤージ工程）に移行し、
そのチヤージ工程完了直後にスクリユを強制後退
させ、加熱シリンダ内にチヤージされている溶融
樹脂の一部がドルーリング（Drooling……はな
たれ）し、成形品のゲート付近に樹脂の垂れが発
生するのを防止するための「サツクバツク」工程
があり、このサツクバツク工程後、射出工程に移
行している。
Generally, in an injection molding machine, after the previous injection process,
Moving on to the process of filling the resin into the heating cylinder containing the screw (hereinafter referred to simply as the charge process),
Immediately after the charging process is completed, the screw is forcibly retreated, causing some of the molten resin charged in the heating cylinder to drool, causing resin to drip near the gate of the molded product. There is a ``suckback'' process to prevent this, and after this process, the injection process begins.
このような射出成形機の工程のための油圧回路
として、従来、第３図に示す油圧回路がある。第
３図において、チヤージ工程中は、加熱シリンダ
内の溶融樹脂によつてスクリユを後退させるので
ピストンロツド１０Ａは図中矢印ａで示す方向に
移動し、射出シリンダ１０のロツド側室１０Ｂに
４方弁１４のＡ−Ｔ流路を介してタンク１７内の
油が吸引される。そしてチヤージ工程完了後、サ
ツクバツク工程に移行するため４方弁１４を
SOLRの励磁により切り替えて４方弁１４の流路
Ｐ−Ａを介して圧油を射出シリンダ１０のロツド
側室１０Ｂに充満させている。 As a hydraulic circuit for such a process in an injection molding machine, there is a conventional hydraulic circuit shown in FIG. In FIG. 3, during the charging process, the screw is retracted by the molten resin in the heating cylinder, so the piston rod 10A moves in the direction shown by arrow a in the figure, and the four-way valve 14 is inserted into the rod side chamber 10B of the injection cylinder 10. The oil in the tank 17 is sucked through the AT flow path. After the charging process is completed, the four-way valve 14 is turned on to move on to the suction process.
The rod side chamber 10B of the injection cylinder 10 is filled with pressure oil through the passage PA of the four-way valve 14 by being switched by the excitation of the SOLR.
しかしながら、上記のような射出成形機の油圧
回路では、チヤージ工程時、ロツド側室１０Ｂ−
Ａ−Ｔ管路に油が完全に充満することなく、部分
的に真空状態になつていることがしばしば生じ
る。このため、チヤージ工程完了後、サツクバツ
ク工程に移行する際、管路１０Ｂ−Ａ−Ｐおよび
射出シリンダ１０のロツド側室１０Ｂに油圧が完
全に充満した後にピストンロツド１０Ａが後退し
始めるので、その間0.5〜1.0秒程度の時間を要す
る。
However, in the hydraulic circuit of the injection molding machine as described above, during the charging process, the rod side chamber 10B-
It often happens that the AT line is not completely filled with oil, but is partially under vacuum. For this reason, when transitioning to the suction process after the completion of the charge process, the piston rod 10A begins to retreat after the pipe line 10B-A-P and the rod side chamber 10B of the injection cylinder 10 are completely filled with hydraulic pressure, so that the piston rod 10A starts to retreat. It takes about seconds.
一方、リリーフ弁１３によつて保持されていた
チヤージ工程中の背圧（射出シリンダ１０のヘツ
ド側室１０Ｃにかかつていた圧力）が完全に下が
るには１秒以上の時間を要する。 On the other hand, it takes one second or more for the back pressure (the pressure that was present in the head side chamber 10C of the injection cylinder 10) during the charging process, which was maintained by the relief valve 13, to be completely reduced.
したがつて、サツクバツクがスタートするまで
に背圧によつてスクリユが前進し、溶融した樹脂
の一部がドルーリングしてしまう現象が起り、次
のサイクルのとき、成形品のゲート付近に樹脂の
垂れが発生し、成形品が表面不良となる問題があ
る。 Therefore, by the time the suction cycle starts, the screw moves forward due to back pressure, causing some of the molten resin to drool, and in the next cycle, resin is deposited near the gate of the molded product. There is a problem that sag occurs and the molded product has surface defects.
本発明の目的は、上記した従来技術の問題点を
解消し、チヤージ工程後のサツクバツク動作の始
動を速やかにしてドルーリングを防止し、表面不
良のない成形品を得ることができる射出成形機の
油圧回路を提供することになる。 An object of the present invention is to provide an injection molding machine which can solve the problems of the prior art described above, can quickly start the suction operation after the charging process, can prevent drooling, and can produce molded products with no surface defects. It will provide a hydraulic circuit.
上記目的を達成するために、本発明は、チヤー
ジ工程中に射出シリンダのロツド側室に予圧を与
える手段を設け、チヤージ工程後、サツクバツク
工程に移行したときに射出シリンダのロツド側室
の油圧が直ちに上昇し、背圧に打ち勝つて直ちに
ピストンロツドを強制後退させるようにしたもの
である。
In order to achieve the above object, the present invention provides a means for applying pre-pressure to the rod side chamber of the injection cylinder during the charging process, so that the oil pressure in the rod side chamber of the injection cylinder immediately increases when the suction process starts after the charging process. However, the piston rod is forced to retreat immediately after overcoming the back pressure.
以下、図面に基づいて本発明の実施例を説明す
る。
Embodiments of the present invention will be described below based on the drawings.
第１図は、本発明の一実施例を示す射出成形機
の油圧回路図である。第１図において、チヤージ
用油圧モータ１１とタンク３とを接続する油圧ラ
インの途中にチエツク弁１５が介設され、このチ
エツク弁１５と油圧モータ１１とを接続する油圧
ラインの途中から射出シリンダ１０のロツド側室
１０Ｂに連通する油圧ライン１９が設けられ、こ
の油圧ライン１９の途中にチエツク弁１６が介設
されている。なお、第１図中２０はスクリユ、２
１は加熱シリンダ、２２は固定金型、２３は可動
金型である。第２図において、上記した構成以外
は第１図に示す従来の射出成形機の油圧回路と実
質的に同じであるので第２図と同一符号で示し詳
細な説明は省略する。 FIG. 1 is a hydraulic circuit diagram of an injection molding machine showing an embodiment of the present invention. In FIG. 1, a check valve 15 is interposed in the middle of a hydraulic line connecting the charging hydraulic motor 11 and the tank 3, and an injection cylinder 10 is inserted from the middle of the hydraulic line connecting the check valve 15 and the hydraulic motor 11. A hydraulic line 19 communicating with the rod side chamber 10B is provided, and a check valve 16 is interposed in the middle of this hydraulic line 19. In addition, 20 in Figure 1 is a screw, 2
1 is a heating cylinder, 22 is a fixed mold, and 23 is a movable mold. In FIG. 2, the components other than those described above are substantially the same as the hydraulic circuit of the conventional injection molding machine shown in FIG. 1, so they are indicated by the same reference numerals as in FIG. 2, and detailed description thereof will be omitted.
次に第１図に示す射出成形機の油圧回路の作用
について説明する。 Next, the operation of the hydraulic circuit of the injection molding machine shown in FIG. 1 will be explained.
射出工程では、４方弁９のソレノイドSOLiが
励磁し、ロジツク弁６，８を圧油が通過できるよ
うに設定される。このとき、モータ１によつて駆
動されるポンプ２によりタンク３内の油は、比較
電磁式圧力・流量制御弁５を経てロジツク弁６を
通過し、射出シリンダ１０のヘツド側室１０Ｃに
圧入される。この油圧作動によつて、ピストンロ
ツド１０Ａは、図中、矢印ａで示す方向と反対に
前進し、加熱シリンダ２１内のスクリユ２０の前
進動作により加熱シリンダ２１内の溶融樹脂は、
固定金型２２と可動金型２３とによつて形成され
るキヤビテイ内に注入される。ピストンロツド１
０Ａが、図中、矢印ａで示す方向と反対の方向に
前進するとき、ロツド側室１０Ｂ内の油はロジツ
ク弁８を通つてタンク３に戻る。 In the injection process, the solenoid SOLi of the four-way valve 9 is energized and set to allow pressure oil to pass through the logic valves 6 and 8. At this time, the oil in the tank 3 is forced into the head side chamber 10C of the injection cylinder 10 by the pump 2 driven by the motor 1 through the comparison electromagnetic pressure/flow control valve 5 and the logic valve 6. . Due to this hydraulic operation, the piston rod 10A moves forward in the direction opposite to the direction indicated by arrow a in the figure, and the molten resin inside the heating cylinder 21 is moved forward by the forward movement of the screw 20 inside the heating cylinder 21.
It is injected into a cavity formed by a fixed mold 22 and a movable mold 23. piston rod 1
When the rod 0A moves forward in the direction opposite to the direction indicated by the arrow a in the figure, the oil in the rod side chamber 10B returns to the tank 3 through the logic valve 8.
次にチヤージ工程に移行したとき４方弁９のソ
レノイドSOLcを励磁し、ロジツク弁７を通つて
チヤージ用油圧モータ１１を回転させる。一方、
４方弁１４は無励磁の状態であるので射出シリン
ダ１０のロツド側室１０Ｂは、１０Ｂ−Ａ−Ｔの
流路によりタンク３と連通し、タンク３内の油は
ロツド側室１０Ｂに吸引される。したがつて射出
シリンダ１０のピストンロツド１０Ａは、加熱シ
リンダ２１に樹脂がチヤージされるにつれて後退
し、射出シリンダ１０のロツド側室１０Ｂにはタ
ンク３からの油が補充される。このとき、油圧モ
ータ１１が回転し、タンク３の油が油圧ライン１
９を介して射出シリンダ１０のロツド側室１０Ｂ
に圧入され、ロツド側室１０Ｂに予圧を与えるこ
とになる。特に、チヤージ用油圧モータ回路のチ
エツク弁１５に発生する抵抗圧（約0.5Kg／cm2）
は、更にチエツク弁１６によつて約0.35Kg／cm2の
抵抗圧が発生し、この抵抗圧が常時射出シリンダ
１０のロツド側室１０Ｂに付与される。 Next, when moving to the charging process, the solenoid SOLc of the four-way valve 9 is energized, and the charging hydraulic motor 11 is rotated through the logic valve 7. on the other hand,
Since the four-way valve 14 is in a non-energized state, the rod side chamber 10B of the injection cylinder 10 communicates with the tank 3 through the flow path 10B-AT, and the oil in the tank 3 is sucked into the rod side chamber 10B. Therefore, the piston rod 10A of the injection cylinder 10 retreats as the heating cylinder 21 is charged with resin, and the rod side chamber 10B of the injection cylinder 10 is replenished with oil from the tank 3. At this time, the hydraulic motor 11 rotates, and the oil in the tank 3 flows into the hydraulic line 1.
9 to the rod side chamber 10B of the injection cylinder 10
This will apply a preload to the rod side chamber 10B. In particular, the resistance pressure generated in the check valve 15 of the charging hydraulic motor circuit (approximately 0.5 kg/cm 2 )
Furthermore, a resistance pressure of approximately 0.35 kg/cm 2 is generated by the check valve 16, and this resistance pressure is constantly applied to the rod side chamber 10B of the injection cylinder 10.
したがつて、チヤージ工程を完了して、サツク
バツク工程に移行したとき、４方弁１４の切り換
えにより、Ｐ→Ａ→１０Ｂの管路と油圧ライン１
９からの圧油によつて射出シリンダのロツド側室
１０Ｂに圧油を送給できるため、直ちに油圧が上
昇し、背圧に打ち勝つてピストンロツド１０Ａを
強制後退させる、サツクバツク動作を行うことが
できる。 Therefore, when the charge process is completed and the transfer process begins, the four-way valve 14 is switched to open the P→A→10B pipeline and the hydraulic line 1.
Since the pressure oil from 9 can be fed to the rod side chamber 10B of the injection cylinder, the oil pressure increases immediately, overcoming the back pressure and forcibly retracting the piston rod 10A, making it possible to perform a back-back operation.
第３図は、上記した本発明の油圧回路の動作と
従来の油圧回路の動作を対比して示している。第
３図から、従来の油圧回路では、射出シリンダ１
０のロツド側室１０Ｂの油圧力は、チヤージ完了
時点からある一定時間の作動遅れ（0.5〜1.0秒）
後に徐々に上昇し、一定の油圧に達している。し
たがつて、従来の油圧回路では射出シリンダ１０
のヘツド側室１０Ｃにかかる圧力（背圧）はチヤ
ージ完了時点から１秒以上が残存し、このため、
図中、斜線で示す領域の時間帯t1においてドルー
リングが生じる。 FIG. 3 shows a comparison between the operation of the hydraulic circuit of the present invention described above and the operation of a conventional hydraulic circuit. From Figure 3, in the conventional hydraulic circuit, the injection cylinder 1
The hydraulic pressure in the 0 rod side chamber 10B is activated for a certain period of time (0.5 to 1.0 seconds) from the time of completion of charging.
After that, it gradually rises and reaches a certain oil pressure. Therefore, in the conventional hydraulic circuit, the injection cylinder 10
The pressure (back pressure) applied to the head side chamber 10C remains for more than 1 second from the time of completion of charging, and therefore,
In the figure, drooling occurs in the time period t1 in the shaded area.
一方、本実施例において、チヤージ完了時点
で、射出シリンダ１０のロツド側室１０Ｂの油圧
が急激に上昇した後、一定の油圧を達している。
したがつて本実施例の油圧回路では、射出シリン
ダ１０Ｃにかかる圧力（背圧）はチヤージ完了時
点で直ちに安全に下がつており、ドルーリングを
生じる領域を有しない。 On the other hand, in this embodiment, at the time of completion of charging, the oil pressure in the rod side chamber 10B of the injection cylinder 10 increases rapidly and then reaches a certain level.
Therefore, in the hydraulic circuit of this embodiment, the pressure (back pressure) applied to the injection cylinder 10C drops safely immediately upon completion of charging, and there is no region where drooling occurs.
本発明において、射出シリンダ１０のロツド側
室１０Ｂに予圧を与える時期は、チヤージ工程中
に亘つてもよいが、チヤージ工程の直後にサツク
バツク動作を行うので少なくともチヤージ工程の
完了直前に予圧を与えればよい。 In the present invention, the preload may be applied to the rod side chamber 10B of the injection cylinder 10 during the charging process, but since the suction operation is performed immediately after the charging process, the preload may be applied at least immediately before the completion of the charging process. .
また射出シリンダ１０のロツド側室１０Ｂに予
圧を与える手段は、図示した例に限定されるもの
ではない。例えば予圧を与える他の手段として射
出シリンダ１０のロツド側室１０Ｂよりも高い位
置に油タンクを設置し、この油タンクから油圧ラ
インを射出シリンダ１０のロツド側室１０Ｂのロ
ツド側室１０Ｂに連通させ、その油圧ラインの途
中に電磁弁を介設し、チヤージ工程の間に電磁弁
を開閉する機構としてもよい。 Furthermore, the means for applying preload to the rod side chamber 10B of the injection cylinder 10 is not limited to the illustrated example. For example, as another means of applying preload, an oil tank is installed at a higher position than the rod side chamber 10B of the injection cylinder 10, and a hydraulic line is communicated from this oil tank to the rod side chamber 10B of the injection cylinder 10, and the oil pressure is A mechanism may also be adopted in which a solenoid valve is interposed in the middle of the line to open and close the solenoid valve during the charging process.
以上のように本発明によれば、チヤージ工程中
の少なくともチヤージ工程の完了直前に射出シリ
ンダのロツド側室に予圧を与える手段を設けたの
で、チヤージ工程後のサツクバツク動作の始動を
連やかに行うことができる。このため、加熱シリ
ンダ内にチヤージされている可塑化原料がドルー
リングしてくることを完全に防止でき、成形品の
品質の安定化を図ることができる。またサツクバ
ツク動作の開始毎に射出シリンダのロツド側室の
油圧が直ちに上昇する。したがつて、従来、この
油圧上昇に要した時間（0.5〜1.0秒）が約0.01秒
程度に短縮され、サイクルアツプとなる。近年の
小型高速射出成形機ではサイクルが10秒前後であ
るので、サイクルアツプにより５〜10％程度の生
産率向上を図ることができる。
As described above, according to the present invention, the means for applying preload to the rod side chamber of the injection cylinder at least immediately before the completion of the charging process is provided, so that the restart operation after the charging process can be started continuously. be able to. Therefore, drooling of the plasticizing raw material charged in the heating cylinder can be completely prevented, and the quality of the molded product can be stabilized. Furthermore, each time the suction operation starts, the oil pressure in the rod side chamber of the injection cylinder immediately increases. Therefore, the time (0.5 to 1.0 seconds) conventionally required for this oil pressure increase is shortened to about 0.01 seconds, resulting in a cycle increase. Since the cycle time of recent small high-speed injection molding machines is around 10 seconds, it is possible to improve the production rate by about 5 to 10% by increasing the cycle time.
第１図は本発明にかかる射出成形機の油圧回路
図、第２図は従来の射出成形機の油圧回路図、第
３図は従来の従来の射出成形機の油圧回路と本発
明にかかる射出成形機の油圧回路とを対比して示
す動作図である。
２……油圧モータ、５……比例電磁式圧力・流
量制御弁、６，７，８……ロジツク弁、９，１
２，１４……ソノレイド、１０……射出シリン
ダ、１０Ａ……ピストンロツド、１０Ｂ……ロツ
ド側室、１０Ｃ……ヘツド側室、１１……チヤー
ジ用油圧モータ、１５，１６……チエツク弁、１
９……油圧ライン、２０……スクリユ、２１……
加熱シリンダ、２２……固定金型、２３……可動
金型。
Fig. 1 is a hydraulic circuit diagram of an injection molding machine according to the present invention, Fig. 2 is a hydraulic circuit diagram of a conventional injection molding machine, and Fig. 3 is a hydraulic circuit diagram of a conventional injection molding machine and an injection molding machine according to the present invention. FIG. 3 is an operation diagram showing a comparison with a hydraulic circuit of a molding machine. 2... Hydraulic motor, 5... Proportional electromagnetic pressure/flow control valve, 6, 7, 8... Logic valve, 9, 1
2, 14...Sonorade, 10...Injection cylinder, 10A...Piston rod, 10B...Rod side chamber, 10C...Head side chamber, 11...Hydraulic motor for charge, 15, 16...Check valve, 1
9... Hydraulic line, 20... Screw, 21...
Heating cylinder, 22...fixed mold, 23...movable mold.
Claims (1)
加熱シリンダ内のスクリユを前進させるための油
圧回路と、加熱シリンダ内に可塑化原料をチヤー
ジする際に射出シリンダのロツド側室に油を充満
させるための油圧回路を備えた射出成形機の油圧
回路において、チヤージ工程中、少なくとも加熱
シリンダ内への可塑化原料のチヤージ完了直前に
射出シリンダのロツド側室に予圧を与える手段を
設けたことを特徴とする射出成形機の油圧回路。 ２ 前記予圧を与える手段は、油圧モータの出口
側から分岐されるとともに前記射出シリンダのロ
ツド側室に連通された油圧ラインからなる特許請
求の範囲第１項記載の射出成形機の油圧回路。 ３ 前記油圧ラインの途中にチエツク弁が介設さ
れている特許請求の範囲第２項記載の射出成形機
の油圧回路。[Scope of Claims] 1. A hydraulic circuit for supplying hydraulic pressure to the head side chamber of the injection cylinder to advance the screw in the heating cylinder, and a hydraulic circuit for supplying hydraulic pressure to the head side chamber of the injection cylinder to advance the screw in the heating cylinder, and a hydraulic circuit for supplying hydraulic pressure to the head side chamber of the injection cylinder to advance the screw in the heating cylinder. In the hydraulic circuit of an injection molding machine equipped with a hydraulic circuit for filling oil, a means is provided for applying prepressure to the rod side chamber of the injection cylinder at least immediately before the charging of the plasticizing raw material into the heating cylinder is completed during the charging process. A hydraulic circuit for an injection molding machine characterized by: 2. The hydraulic circuit for an injection molding machine according to claim 1, wherein the means for applying preload comprises a hydraulic line branched from the outlet side of the hydraulic motor and communicated with the rod side chamber of the injection cylinder. 3. The hydraulic circuit for an injection molding machine according to claim 2, wherein a check valve is interposed in the middle of the hydraulic line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1299586A JPS62173230A (en) | 1986-01-25 | 1986-01-25 | Hydraulic pressure circuit of injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1299586A JPS62173230A (en) | 1986-01-25 | 1986-01-25 | Hydraulic pressure circuit of injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62173230A JPS62173230A (en) | 1987-07-30 |
| JPH0317660B2 true JPH0317660B2 (en) | 1991-03-08 |
Family
ID=11820785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1299586A Granted JPS62173230A (en) | 1986-01-25 | 1986-01-25 | Hydraulic pressure circuit of injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62173230A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0440899Y2 (en) * | 1988-02-16 | 1992-09-25 | ||
| JPH04272819A (en) * | 1991-02-27 | 1992-09-29 | Japan Steel Works Ltd:The | Hydraulic circuit for injection molding machine |
| DE19517582C2 (en) * | 1995-05-05 | 1998-08-20 | Mannesmann Ag | Drive for the injection and plasticizing unit of a plastic injection molding machine |
-
1986
- 1986-01-25 JP JP1299586A patent/JPS62173230A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62173230A (en) | 1987-07-30 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |