JPH09220504A - Hot-melt applicator - Google Patents

Hot-melt applicator

Info

Publication number
JPH09220504A
JPH09220504A JP2890996A JP2890996A JPH09220504A JP H09220504 A JPH09220504 A JP H09220504A JP 2890996 A JP2890996 A JP 2890996A JP 2890996 A JP2890996 A JP 2890996A JP H09220504 A JPH09220504 A JP H09220504A
Authority
JP
Japan
Prior art keywords
valve
valve seat
hot melt
nozzle opening
melt agent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2890996A
Other languages
Japanese (ja)
Other versions
JP3476615B2 (en
Inventor
Katsuhiko Koike
克彦 小池
Norihiro Kuzuu
典宏 葛生
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nireco Corp
Original Assignee
Nireco Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nireco Corp filed Critical Nireco Corp
Priority to JP02890996A priority Critical patent/JP3476615B2/en
Priority to US08/796,705 priority patent/US5924607A/en
Priority to EP99121500A priority patent/EP0979683A3/en
Priority to DE69715936T priority patent/DE69715936T2/en
Priority to EP97102086A priority patent/EP0790080B1/en
Publication of JPH09220504A publication Critical patent/JPH09220504A/en
Priority to US09/144,081 priority patent/US5934521A/en
Application granted granted Critical
Publication of JP3476615B2 publication Critical patent/JP3476615B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05CAPPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work

Abstract

PROBLEM TO BE SOLVED: To prevent the phenomenon of drawdown of a hot melt in shutting off a nozzle opening. SOLUTION: This device is provided with a nozzle opening 11, a valve seat 9 provided on the upstream side of the opening, an empty chamber 10 formed between the nozzle opening 11 and the valve seat 9, a valve 8a opening, closing and moving on the valve seat 9, a spring 13 for driving the valve 8a and pneumatic pressure driving cylinders 4 and 7 for driving the spring 13, and the valve 8a is formed into a conical body with its nozzle opening side as a vertical angle, and the valve seat 9 is provided with an inclined face being in contact with the conical body, and the angle of the inclined face is set larger than the vertical angle of the conical body, and the length of the inclined face is set as 1-2mm.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は熱可塑性を有するホ
ットメルト剤の糊を塗布する装置に係わり、特にノズル
を遮断した時、ノズルからホットメルト剤が尾を引くこ
とを防止するホットメルト剤塗布装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for applying a paste of a hot melt agent having thermoplasticity, and particularly to a hot melt agent application for preventing the hot melt agent from catching a tail from the nozzle when the nozzle is blocked. Regarding the device.

【0002】[0002]

【従来の技術】製箱、製袋等のため材料の糊代に糊を断
続的に塗布し、折り曲げて予め定めた位置と接着し、箱
や袋を形成する方法が広く用いられている。糊の塗布方
法としては、ローラを用いる場合と吐出ノズルを用いる
場合があるが、断続的に糊を塗布する場合、制御が容易
であるため、吐出ノズルが用いられている。
2. Description of the Related Art For box making, bag making, etc., a method is widely used in which glue is intermittently applied to a glue margin of a material and then bent and adhered to a predetermined position to form a box or bag. As a method of applying the glue, there are a case of using a roller and a case of using a discharge nozzle. However, in the case of applying the glue intermittently, the discharge nozzle is used because it is easy to control.

【0003】吐出ノズルより糊を断続して吐出する場
合、吐出を遮断したとき、糊の吐出が直ちに止まらず、
尾を引く場合がある。このため、特公平5−68312
号公報には塗布ノズルを閉鎖時ノズル内に負圧が生じる
ようにして尾を引く現象を防止する技術が開示されてい
る。特開昭50−122539号公報および実開昭55
−2474には吐出ノズル内に吸引ノズルを設け、吐出
ノズルを遮断した時の残留液体を吸引する技術が開示さ
れている。また特開平5−97127号公報には、ノズ
ル開口を遮断する時、吐出速度を速くし、かつエアノズ
ルから空気を吐出して吹き飛ばすことにより尾を引く現
象を防止する技術が開示されている。
When the glue is intermittently discharged from the discharge nozzle, when the discharge is interrupted, the discharge of the glue does not immediately stop,
May have a tail. Therefore, Japanese Patent Publication No. 5-68312
Japanese Unexamined Patent Publication (Kokai) discloses a technique for preventing a phenomenon of pulling a tail by causing a negative pressure in the nozzle when the coating nozzle is closed. Japanese Unexamined Patent Application Publication No. 50-122539 and Japanese Utility Model Application Laid-Open No. 55
No. 2474 discloses a technique in which a suction nozzle is provided in the discharge nozzle and the residual liquid is sucked when the discharge nozzle is blocked. Further, Japanese Patent Application Laid-Open No. 5-97127 discloses a technique of increasing a discharge speed when blocking a nozzle opening and preventing a phenomenon of catching a tail by discharging and blowing air from an air nozzle.

【0004】[0004]

【発明が解決しようとする課題】糊には通常使用されて
いるコールド剤と称する水性糊とホットメルト剤と称さ
れる熱可塑性の糊とがあり、一般的な性状として、コー
ルド剤の場合、塗布した後接着力が生じるまでの乾燥時
間が必要となるが、ホットメルト剤は塗布すると直ちに
接着力が生じる。このホットメルト剤は粘性が大きくノ
ズルで塗布する場合、ノズル開口遮断時、糊が尾を引く
現象が著しく現れる。特開平5−97127号公報に示
された塗布装置の場合、コールド剤に対しては尾を引く
現象の防止に効果があるが、ホットメルト剤の場合、こ
の現象を防止することはできない。
There are two types of pastes, an aqueous paste which is usually used as a cold agent and a thermoplastic paste which is called a hot melt agent. Generally, in the case of a cold agent, A drying time is required until adhesive force is generated after application, but the adhesive force is immediately generated when the hot melt agent is applied. This hot melt agent has a large viscosity, and when it is applied by a nozzle, the phenomenon that the glue tails when the nozzle opening is blocked appears remarkably. In the case of the coating device disclosed in Japanese Patent Application Laid-Open No. 5-97127, it is effective in preventing the phenomenon of tailing against the cold agent, but in the case of the hot melt agent, this phenomenon cannot be prevented.

【0005】本発明は、上述の問題点に鑑みてなされた
もので、ノズル開口遮断時ホットメルト剤が尾を引くこ
とを防止する塗布装置を提供することを目的とする。
The present invention has been made in view of the above problems, and an object of the present invention is to provide a coating apparatus which prevents the hot melt agent from catching the tail when the nozzle opening is blocked.

【0006】[0006]

【課題を解決するための手段】上記目的を達成するため
請求項1の発明では、ノズル開口と、ノズル開口の上流
側に設けられた弁座と、ノズル開口と弁座の間に設けら
れた空室と、弁座に対して開閉移動する弁体と、弁体を
駆動するバネと、このバネを駆動する空気圧駆動シリン
ダとを備え、前記弁体はノズル開口側を頂角とする円錐
体であり、前記弁座は円錐体と接する傾斜面を有してお
り、傾斜面の角度は円錐体の頂角より大きくなってお
り、傾斜面の長さを1〜2mmとする。
In order to achieve the above object, in the invention of claim 1, a nozzle opening, a valve seat provided on the upstream side of the nozzle opening, and between the nozzle opening and the valve seat are provided. A conical body having an empty space, a valve body that opens and closes with respect to a valve seat, a spring that drives the valve body, and a pneumatic drive cylinder that drives this spring, and the valve body has a vertex angle on the nozzle opening side. The valve seat has an inclined surface in contact with the conical body, the angle of the inclined surface is larger than the apex angle of the conical body, and the length of the inclined surface is 1 to 2 mm.

【0007】弁体の駆動は閉鎖方向にはバネにより行わ
れ、空気圧シリンダで、このバネの力に打ち勝って開方
向の移動が行われる。ホットメルト剤は粘性が大きいた
め閉鎖時に大きな力を発生するバネが必要となり、この
バネを圧縮するのに小さな体積で大きな力を発生できる
空気圧シリンダを用いる。
The valve body is driven by a spring in the closing direction, and the pneumatic cylinder is moved in the opening direction by overcoming the force of the spring. Since the hot melt agent has a large viscosity, a spring that generates a large force when closing is required, and a pneumatic cylinder that can generate a large force with a small volume is used to compress the spring.

【0008】弁体を構成する円錐体が弁閉鎖時、この円
錐体と接する傾斜面を有する弁座に向かって移動する
際、円錐体の傾斜面と弁座の傾斜面との間隔は徐々に狭
くなり、最終的に接触する。この間隔に充満しているホ
ットメルト剤の一部は弁体の閉鎖方向と反対方向に逃げ
るが、大部分は弁体の閉鎖方向に押圧される。この結
果、弁座とノズル開口の間に設けられた空室の圧力が増
大し、ノズル開口より吐出されるホットメルト剤の吐出
速度が増大する。弁座の傾斜面の長さを1mm以上とす
るとこの吐出速度増大によるホットメルト剤の尾を引く
現象の防止に大きな効果が発生するが、1mm未満では
尾を引く現象を防止できない。この弁座の傾斜面の長さ
は長い方が尾を引く現象の防止には効果があるが、弁座
の加工費が急激に増加するので上限は2mmとしてい
る。また弁座の傾斜面の角度を円錐体の頂角より大きく
することにより、閉鎖時円錐体が弁座に確実に接触し、
ホットメルト剤の洩れを確実に防止できる。空気圧シリ
ンダの採用による弁体を大きな力で押圧するバネと、適
切な弁座の傾斜面の長さの採用により、弁閉鎖時のホッ
トメルト剤の尾を引く現象を確実に防止することができ
る。
When the cone forming the valve body moves toward the valve seat having an inclined surface in contact with the cone when the valve is closed, the distance between the inclined surface of the cone and the inclined surface of the valve seat gradually increases. It becomes narrower and eventually contacts. A part of the hot melt agent filled in this space escapes in the direction opposite to the closing direction of the valve body, but most of it is pressed in the closing direction of the valve body. As a result, the pressure of the empty chamber provided between the valve seat and the nozzle opening increases, and the discharge speed of the hot melt agent discharged from the nozzle opening increases. When the length of the inclined surface of the valve seat is set to 1 mm or more, a great effect occurs in preventing the phenomenon of tailing of the hot melt agent due to this increase in discharge speed, but when it is less than 1 mm, the phenomenon of tailing cannot be prevented. A longer length of the inclined surface of the valve seat is effective in preventing the phenomenon of tailing, but the upper limit is set to 2 mm because the machining cost of the valve seat increases sharply. Also, by making the angle of the inclined surface of the valve seat larger than the apex angle of the cone, the cone will surely contact the valve seat when closed,
The leakage of the hot melt agent can be reliably prevented. By adopting a spring that presses the valve element with a large force by using a pneumatic cylinder and an appropriate length of the inclined surface of the valve seat, it is possible to reliably prevent the phenomenon that the hot melt agent is pulled when the valve is closed. .

【0009】請求項2の発明では、前記弁体の開閉移動
距離を0.3〜0.5mmとする。
According to the second aspect of the invention, the opening / closing movement distance of the valve body is 0.3 to 0.5 mm.

【0010】弁体の開閉移動距離(以下ストロークと称
する)は小さいと、弁体閉鎖時円錐体と弁座の傾斜面と
の間隔を狭くすることによるホットメルト剤の吐出速度
の増速効果が小さい。ストロークを0.3mm以上とす
るとホットメルト剤の尾を引く現象を防止できるように
なる。また、ストロークが長くなると弁を閉鎖する時間
が長くなるので、ストローク上限を0.5mmとしてい
る。
If the opening / closing movement distance (hereinafter referred to as the stroke) of the valve body is small, the effect of increasing the discharge speed of the hot melt agent by narrowing the distance between the conical body when the valve body is closed and the inclined surface of the valve seat is obtained. small. When the stroke is 0.3 mm or more, it is possible to prevent the phenomenon that the hot melt agent is trailing. Also, since the valve closing time becomes longer as the stroke becomes longer, the stroke upper limit is set to 0.5 mm.

【0011】[0011]

【発明の実施の形態】以下、本発明の実施の形態につい
て図面を参照して説明する。図1は実施の形態のホット
メルト剤塗布装置の断面図である。装置の本体1は円筒
形で内径が中央部で2段となっており、図1で上部がシ
リンダ4、下部が糊室3に別れ、段の付いた糊室側に仕
切りシール2が設けられて糊室3とシリンダ4とを分
け、糊室3にシリンダ4からの空気が洩れないようにシ
ールしている。糊室3の端部には弁座9やノズル開口1
1を有する糊室蓋5がボルトで本体1に取り付けられて
おり、シリンダ4の端部にはシリンダ蓋6がねじ込みに
より接合されている。
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a hot melt agent application device according to an embodiment. The main body 1 of the device has a cylindrical shape and has an inner diameter in two steps in the central part. In FIG. 1, the upper part is divided into a cylinder 4 and the lower part is divided into a glue chamber 3, and a partition seal 2 is provided on the stepped glue chamber side. The glue chamber 3 and the cylinder 4 are separated from each other and sealed so that the air from the cylinder 4 does not leak into the glue chamber 3. A valve seat 9 and a nozzle opening 1 are provided at the end of the glue chamber 3.
A glue chamber lid 5 having 1 is attached to the main body 1 with bolts, and a cylinder lid 6 is joined to the end of the cylinder 4 by screwing.

【0012】シリンダ内にはピストン7が設けられ、ピ
ストン7は仕切りシール2を貫通し、糊室3を通り、糊
室蓋5へ達するニードル弁8と接合されている。ニード
ル弁8の先端の弁体8aは円錐形で糊室蓋5に設けられ
た円錐形の傾斜面を有する弁座9と接触し、弁機能を発
揮する。弁座9は円筒状の空室10へ接続しており、空
室10の端部にはノズル開口11が設けられている。糊
室3には糊入口12が設けられ、図示しない装置よりホ
ットメルト剤が供給される。ホットメルト剤は室温では
固化しているので塗布時に加熱して液化し、ポンプで供
給される。
A piston 7 is provided in the cylinder, and the piston 7 is joined to a needle valve 8 which penetrates the partition seal 2, passes through the glue chamber 3, and reaches the glue chamber lid 5. The valve body 8a at the tip of the needle valve 8 comes into contact with the valve seat 9 having a conical inclined surface provided on the glue chamber lid 5 in a conical shape, and exhibits a valve function. The valve seat 9 is connected to a cylindrical empty chamber 10, and a nozzle opening 11 is provided at the end of the empty chamber 10. A glue inlet 12 is provided in the glue chamber 3, and a hot melt agent is supplied from a device (not shown). Since the hot melt agent is solidified at room temperature, it is heated and liquefied at the time of application and supplied by a pump.

【0013】ピストン7とシリンダ蓋6との間にはバネ
13が設けられ、ピストン7を押圧してニードル弁8を
弁座9に押し付け弁の遮断を行う。シリンダ蓋6にはス
トローク調整ネジ14が設けられ、ナット15により調
整した位置に固定される。ピストン7のストローク調整
ネジ14と対向する位置にネジ受け16が設けられてい
る。ピストン7がバネ13で押圧されニードル弁8が弁
座9に押し付けられた状態におけるネジ受け16とスト
ローク調整ネジ14の間隙がニードル弁8のストローク
となる。シリンダの仕切りシール2側には空気口17が
設けられ、シリンダ4への圧縮空気の供給、排出が行わ
れる。空気口17には電磁切換弁18が接続され、図示
しない制御装置からの切換信号により動作する。電磁切
換弁18は圧縮空気を供給する空気源19に接続されて
いる。
A spring 13 is provided between the piston 7 and the cylinder lid 6 to press the piston 7 to press the needle valve 8 against the valve seat 9 to shut off the valve. The cylinder lid 6 is provided with a stroke adjusting screw 14 and is fixed at a position adjusted by a nut 15. A screw receiver 16 is provided at a position facing the stroke adjusting screw 14 of the piston 7. The stroke of the needle valve 8 is the gap between the screw receiver 16 and the stroke adjusting screw 14 when the piston 7 is pressed by the spring 13 and the needle valve 8 is pressed against the valve seat 9. An air port 17 is provided on the side of the partition seal 2 of the cylinder, and compressed air is supplied to and discharged from the cylinder 4. An electromagnetic switching valve 18 is connected to the air port 17 and operates by a switching signal from a control device (not shown). The electromagnetic switching valve 18 is connected to an air source 19 that supplies compressed air.

【0014】図2はニードル弁と弁座の周囲構造を示す
図である。ニードル弁8の弁体8aは円錐体であり、こ
の頂角θは59°となっている。頂角θは60°前後の
値がホットメルト剤の尾引き防止と、加工性などから好
ましい。弁座9も円錐形の傾斜面を有し、この円錐形の
頂角は、弁体8aの頂角より1°大きい60°となって
いる。これにより弁体8aが弁座9に確実に密着し、ホ
ットメルト剤の漏れをシールする。また弁座9の傾斜面
の長さLは1〜2mmとなっている。弁体8aはバネ1
3と圧縮空気の作用により実線と破線で示される位置を
移動して開閉動作を行う。弁体8aを押圧すると、破線
で示す弁体8aと弁座9の傾斜面との間のホットメルト
剤は、一部は糊室3に戻るが、大部分は弁体8aに押さ
れて空室10へ入り、空室10内の圧力が上昇し、ノズ
ル開口11からホットメルト剤が増速されて吐出され
る。ホットメルト剤は非圧縮性で粘度の高い液体であ
り、糊室3にはホットメルト剤が充満しているので、弁
体8aが押圧されて移動するとき、糊室3に戻るものは
一部で大部分は空室10へ移動する。
FIG. 2 is a view showing the structure around the needle valve and the valve seat. The valve body 8a of the needle valve 8 is a cone, and the apex angle θ is 59 °. The apex angle θ is preferably around 60 ° in order to prevent tailing of the hot melt agent and to improve workability. The valve seat 9 also has a conical inclined surface, and the apex angle of this conical shape is 60 °, which is 1 ° larger than the apex angle of the valve body 8a. As a result, the valve body 8a surely comes into close contact with the valve seat 9 and seals the leak of the hot melt agent. The length L of the inclined surface of the valve seat 9 is 1 to 2 mm. Valve body 8a is spring 1
By the action of 3 and the compressed air, the position shown by the solid line and the broken line is moved to open and close. When the valve body 8a is pressed, the hot melt agent between the valve body 8a and the inclined surface of the valve seat 9 shown by the broken line partially returns to the glue chamber 3, but most of the hot melt agent is pushed by the valve body 8a and becomes empty. After entering the chamber 10, the pressure in the vacant chamber 10 rises, and the hot melt agent is accelerated and discharged from the nozzle opening 11. The hot melt agent is a non-compressible liquid having a high viscosity, and the glue chamber 3 is filled with the hot melt agent. Therefore, when the valve body 8a is pressed and moves, some of the hot melt agent returns to the glue chamber 3. Most of them move to the vacant room 10.

【0015】この弁座9の傾斜面の長さLは弁閉鎖時の
ホットメルト剤の吐出速度の増大に影響を与える。Lが
1mm未満だと糊の尾を引く現象の防止にあまり効果は
ないが1mm以上とするとほぼ確実にこの尾を引く現象
を防止できる。Lの値を大きくしてもこの現象の防止に
効果はあるが、大きくすると弁座9の加工費が増大する
ので上限を2mm程度としている。
The length L of the inclined surface of the valve seat 9 affects the increase in the discharge speed of the hot melt agent when the valve is closed. If L is less than 1 mm, there is not much effect in preventing the phenomenon of tailing of the glue, but if L is 1 mm or more, the phenomenon of tailing can be almost certainly prevented. Increasing the value of L is effective in preventing this phenomenon, but if it is increased, the machining cost of the valve seat 9 increases, so the upper limit is set to about 2 mm.

【0016】ニードル弁8のストロークはストローク調
整ネジ14により0.3〜0.5mmの範囲に調整され
ている。ストロークが小さいと弁閉鎖時に弁体8aによ
って空室10へ押し出されるホットメルト剤の量が十分
でないため、吐出速度の増大が少なく、尾を引く現象の
防止が十分でない。0.3mm以上とするとほぼ確実に
尾を引く現象を防止できる。ストロークが大きい方がホ
ットメルト剤の吐出速度の増大には効果的であるが、尾
を引かなくなれば、それ以上吐出速度を増大する必要は
ない。ストロークが大きくなると弁の閉鎖時間が長くな
るので、ストロークの上限を0.5mmとしている。
The stroke of the needle valve 8 is adjusted in the range of 0.3 to 0.5 mm by the stroke adjusting screw 14. If the stroke is small, the amount of the hot melt agent pushed out into the vacant chamber 10 by the valve body 8a when the valve is closed is not sufficient, so the increase in discharge speed is small and the phenomenon of tailing is not sufficiently prevented. If it is 0.3 mm or more, the phenomenon of pulling the tail can be almost certainly prevented. A larger stroke is more effective for increasing the discharge speed of the hot melt agent, but if the tail is not drawn, it is not necessary to increase the discharge speed any further. Since the closing time of the valve becomes longer as the stroke becomes larger, the upper limit of the stroke is set to 0.5 mm.

【0017】図3は空気圧駆動シリンダとソレノイドに
よる電磁駆動手段との駆動力を比較した図である。横軸
はニードル弁のストロークSを表し、縦軸は発生する力
を表す。空気駆動シリンダの発生する力はPで示すよう
にストロークSに対して一定となるが、ソレノイドによ
る電磁駆動手段ではQに示すようにストロークSの増加
につれて急激に減少する。ホットメルト剤は粘性が大き
いため、ニードル弁8は閉鎖時大きな抵抗を受けるの
で、押圧するバネ13の弾性力は大きくなる。このため
バネ13を圧縮する手段としては大きな力を連続して発
生できる空気圧シリンダが適している。
FIG. 3 is a view comparing the driving forces of the pneumatic drive cylinder and the electromagnetic drive means by the solenoid. The horizontal axis represents the needle valve stroke S, and the vertical axis represents the generated force. The force generated by the air-driven cylinder is constant with respect to the stroke S as indicated by P, but the electromagnetic drive means by a solenoid sharply decreases as the stroke S increases as indicated by Q. Since the hot melt agent has a large viscosity, the needle valve 8 receives a large resistance when closed, so that the elastic force of the pressing spring 13 becomes large. Therefore, a pneumatic cylinder capable of continuously generating a large force is suitable as a means for compressing the spring 13.

【0018】以上のように構成されたホットメルト剤塗
布装置の性能について説明する。図4はノズル開口11
からのホットメルト剤の吐出速度を示す図である。横軸
は時間を表し、縦軸はノズル開口11からの吐出速度を
示す。即ち、空室10の圧力を示す。弁が閉動作を開始
すると吐出速度は増大し、弁閉終了時の吐出速度は、通
常の吐出速度より大きくなっている。これにより弁閉鎖
時ホットメルト剤が尾を引く現象を防止できる。本図は
特開平5−97127の図8と同様であり、この図8は
コールド剤の場合であるが、本発明によりホットメルト
剤もコールド剤と同様に尾を引く現象を防止できること
を示している。
The performance of the hot-melt-agent coating device configured as described above will be described. FIG. 4 shows the nozzle opening 11
It is a figure which shows the discharge speed of the hot-melt agent from. The horizontal axis represents time, and the vertical axis represents the ejection speed from the nozzle opening 11. That is, it indicates the pressure in the vacant chamber 10. The discharge speed increases when the valve starts the closing operation, and the discharge speed at the end of the valve closing is higher than the normal discharge speed. This prevents the hot melt agent from catching the tail when the valve is closed. This figure is the same as FIG. 8 of JP-A-5-97127. This figure shows the case of a cold agent. It is shown that the hot-melt agent can prevent the phenomenon of tailing like the cold agent according to the present invention. There is.

【0019】[0019]

【発明の効果】以上の説明より明らかなように、本発明
は、弁体を駆動する空気圧駆動シリンダを用いて、弁体
を押圧するバネを圧縮するようにしたのでバネを大きな
容量としてホットメルト剤の大きな抵抗をかわし、弁体
と弁座の角度を少し変えることにより閉鎖時の洩れを防
止し、弁体と接する弁座の傾斜面の長さを1〜2mmと
することにより、ホットメルト剤のような粘性の大きな
糊に対しても尾を引く現象を防止することを可能とし
た。また、弁体のストロークを0.3〜0.5mmとす
るとさらにこの現象の防止に効果的である。
As is apparent from the above description, according to the present invention, the pneumatic pressing cylinder for driving the valve element is used to compress the spring for pressing the valve element. Dodging the large resistance of the agent, preventing the leakage at the time of closing by slightly changing the angle between the valve body and the valve seat, and making the length of the inclined surface of the valve seat in contact with the valve body 1 to 2 mm, the hot melt It is possible to prevent the phenomenon of tailing even with a highly viscous glue such as an agent. Further, setting the stroke of the valve body to 0.3 to 0.5 mm is more effective in preventing this phenomenon.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の実施の形態の構成を示す断面図であ
る。
FIG. 1 is a cross-sectional view showing a configuration of an embodiment of the present invention.

【図2】実施の形態の弁体と、弁座およびノズル開口の
詳細図である。
FIG. 2 is a detailed view of the valve body, the valve seat, and the nozzle opening of the embodiment.

【図3】空気圧駆動シリンダと電磁駆動手段の駆動力を
示す図である。
FIG. 3 is a diagram showing driving forces of a pneumatic drive cylinder and an electromagnetic drive means.

【図4】実施の形態のノズルから吐出するホットメルト
剤の吐出速度を示す図である。
FIG. 4 is a diagram showing a discharge speed of the hot melt agent discharged from the nozzle of the embodiment.

【符号の説明】[Explanation of symbols]

1 本体 2 仕切りシール 3 糊室 4 シリンダ 5 糊室蓋 6 シリンダ蓋 7 ピストン 8 ニードル弁 8a 弁体 9 弁座 10 空室 11 ノズル開口 12 糊入口 13 バネ 14 ストローク調整ネジ 17 空気口 18 電磁切換弁 19 空気源 1 Main Body 2 Partition Seal 3 Glue Chamber 4 Cylinder 5 Glue Chamber Lid 6 Cylinder Lid 7 Piston 8 Needle Valve 8a Valve Body 9 Valve Seat 10 Vacancy 11 Nozzle Opening 12 Glue Inlet 13 Spring 14 Stroke Adjusting Screw 17 Air Port 18 Electromagnetic Switching Valve 19 Air source

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 ノズル開口と、ノズル開口の上流側に設
けられた弁座と、ノズル開口と弁座の間に設けられた空
室と、弁座に対して開閉移動する弁体と、弁体を駆動す
るバネと、このバネを駆動する空気圧駆動シリンダとを
備え、 前記弁体はノズル開口側を頂角とする円錐体であり、前
記弁座は円錐体と接する傾斜面を有しており、傾斜面の
角度は円錐体の頂角より大きくなっており、傾斜面の長
さを1〜2mmとしたことを特徴とするホットメルト剤
塗布装置。
1. A nozzle opening, a valve seat provided on the upstream side of the nozzle opening, an empty chamber provided between the nozzle opening and the valve seat, a valve body that opens and closes with respect to the valve seat, and a valve. A spring for driving the body and a pneumatic drive cylinder for driving the spring are provided, the valve body is a conical body having an apex angle on the nozzle opening side, and the valve seat has an inclined surface in contact with the conical body. The angle of the inclined surface is larger than the apex angle of the conical body, and the length of the inclined surface is 1 to 2 mm.
【請求項2】 前記弁体の開閉移動距離を0.3〜0.
5mmとしたことを特徴とする請求項1記載のホットメ
ルト剤塗布装置。
2. The opening / closing movement distance of the valve body is 0.3 to 0.
The hot melt agent application device according to claim 1, wherein the hot melt agent application device is 5 mm.
JP02890996A 1996-02-16 1996-02-16 Hot melt dispenser Expired - Fee Related JP3476615B2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP02890996A JP3476615B2 (en) 1996-02-16 1996-02-16 Hot melt dispenser
US08/796,705 US5924607A (en) 1996-02-16 1997-02-06 Hot melt applicator and nozzle used therefor
EP99121500A EP0979683A3 (en) 1996-02-16 1997-02-10 A nozzle used for discharging viscous fluid
DE69715936T DE69715936T2 (en) 1996-02-16 1997-02-10 Hot glue applicator and nozzle therefor
EP97102086A EP0790080B1 (en) 1996-02-16 1997-02-10 Hot melt applicator and nozzle used therefor
US09/144,081 US5934521A (en) 1996-02-16 1998-08-31 Hot melt applicator and nozzle used therefor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP02890996A JP3476615B2 (en) 1996-02-16 1996-02-16 Hot melt dispenser

Publications (2)

Publication Number Publication Date
JPH09220504A true JPH09220504A (en) 1997-08-26
JP3476615B2 JP3476615B2 (en) 2003-12-10

Family

ID=12261539

Family Applications (1)

Application Number Title Priority Date Filing Date
JP02890996A Expired - Fee Related JP3476615B2 (en) 1996-02-16 1996-02-16 Hot melt dispenser

Country Status (1)

Country Link
JP (1) JP3476615B2 (en)

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JP2006175437A (en) * 2004-12-22 2006-07-06 Nordson Corp Liquid discharging device having improved-type seal assembly
JP2010029854A (en) * 2009-09-09 2010-02-12 Musashi Eng Co Ltd Nozzle for apparatus for discharging fixed amount of liquid
JP2016187810A (en) * 2010-01-14 2016-11-04 ノードソン コーポレーションNordson Corporation Jetting discrete volumes of high viscosity liquid
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US10363568B2 (en) 2010-01-14 2019-07-30 Nordson Corporation Jetting discrete volumes of high viscosity liquid
JP2016128168A (en) * 2010-06-05 2016-07-14 ノードソン コーポレーションNordson Corporation Jetting dispenser and method of jetting highly cohesive adhesives
JP2013536261A (en) * 2010-06-05 2013-09-19 ノードソン コーポレーション Spray dispenser and method for spraying high tack adhesive
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CN106842483B (en) * 2017-02-28 2022-09-16 西安中科光电精密工程有限公司 A beat fast and glue syringe needle for camera module

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