KR20150054640A - Composite Resin Supply Apparatus - Google Patents

Abstract

The present invention relates to a composite resin supply apparatus which comprises: a resin supply unit formed with a plurality of resin supply fluid paths to supply a composite resin including a first resin composed of polypropylene (PP) resin, and a second resin composed of an ethylene vinylalcohol copolymer (EVOH); a piston assembly having a lower piston part performing primary lifting and lowering of a valve pin, and an upper piston part performing secondarily lifting and lowering of the valve pin in order to discharge the composite resin; and a nozzle assembly including an outer bush provided with the composite resin through the resin supply fluid paths, and discharging the second resin while being circulated along an outer peripheral surface, and discharging the composite resin by the operation of the valve pin, an inner bush inserted into the inside of the outer bush, and having the second resin discharged while being circulated along an outer peripheral surface, and having the first resin discharged by the operation of the valve pin, and a nozzle housing into which the outer bush is inserted, and discharging the composite resin discharged through the outer bush and inner bush to a gate side of a mold.

Description

{Composite Resin Supply Apparatus}

The present invention provides a container made of a composite resin which can supply various kinds of molten resins to a single discharge path so as to be able to selectably supply the mutual supply positions and supply timings so as to be able to arbitrarily arrange the resin layers, And is capable of injecting a high-quality molded article by manufacturing the nozzle bush with an insert material of the same series so as to prevent and suppress curing of the discharged composite resin by the cooling system of the mold .

Generally, a synthetic resin material for forming a container body such as a cup body or a previous molded body (generally referred to as a preform) or a container cover, which is formed into a beverage container by applying a blow molding process, is used as the composite resin supply device.

In such a composite resin supply device, a molten resin for forming a sub-layer forming a sub-layer of a preform having an outermost flow path through which the main layer forming molten resin forming the main layer of the preform flows and an outer outlet opening into the outermost flow path An inner flow path through which the core-forming molten resin flows, which forms the core having the outer flow path and the inner discharge port opened in the outer flow path, is provided.

In such a conventional composite resin supply device, there are provided opening / closing means for selectively opening / closing the inner discharge port and intermittent means for intermittently arranging the molten resin for forming the sub-layer at the outer outlet, When the core layer forming molten resin is intermittently introduced into the outermost flow path from the inner flow path through the inner flow path by opening and closing the inner discharge port and the molten resin forming the core layer flows into the inside of the outermost flow path, As shown in Fig.

However, since the composite resin supply apparatus according to the related art has a three-layered preform of the main layer-core layer-main layer, the core layer having the functionality differs from the main layer in material, But was limited to the molding of the preform of the structure.

Further, since the core layer and the shell layer are spherical, it is difficult to control the layer distribution of the multilayered compression molded product, and there is also a problem that inclusion of the core layer by the shell layer is also difficult.

(Patent Document 1) Japanese Laid-Open Patent Application No. 2003-39531 (Mar. 23, 2003)

In order to solve such problems, the present invention can provide various kinds of molten resins to a single discharge path so as to be able to appropriately select a supply position and a supply timing of each other, The present invention has been made in view of the above problems, and it is an object of the present invention to provide a composite resin supply device for molding a container made of a composite resin.

The present invention also provides a composite resin supply device capable of storing contents stored in a container for a long time, preventing clogging caused by external heat, maintaining the freshness of the contents for a long time, and extending the shelf life of the contents It has its purpose.

The present invention also provides a composite resin supply device capable of injecting a high-quality molded article by manufacturing the nozzle bushing from an insert material of the same series so as to prevent and suppress curing of the discharged composite resin by the cooling system of the mold The purpose is to provide.

In order to accomplish the above object, the present invention provides a resin supply apparatus including a resin supply portion having a plurality of resin supply passages for supplying a composite resin including a first resin composed of PP (polypropylene) resin and a second resin composed of EVOH (ethylene vinylalcohol copolymer) ; A piston assembly including a lower piston portion for primarily lifting and lowering the valve pin so as to discharge the composite resin, and an upper piston portion for performing a secondary up-and-down movement of the valve pin; And an outer side portion which is supplied with the composite resin through the resin supply passage and through which the second resin is discharged while the outer circumferential surface is circulated and on which the composite resin is discharged in accordance with the operation of the valve pin, A second resin is discharged while being circulated along the outer circumferential surface and the first resin is discharged according to the operation of the valve pin; and the composite resin is discharged through the outer tube and the inner tube, And a nozzle assembly including a nozzle housing for discharging the molten metal to the gate side of the mold.

In one embodiment of the present invention, the outer side portion is connected to a plurality of resin supply paths formed in the resin supply portion, and the first and second resin are supplied to the inner side portion and the outer side portion side, A first outer side portion in which a resin transfer path is formed; And first and second resin flow paths formed in the lower portion of the first outer side portion and inserted into the inner side portion and connected to the first and second resin flow paths, And discharging the discharged composite resin toward the nozzle housing.

According to an embodiment of the present invention, the first resin transfer path is formed so that one side is branched and communicates with the inside of the inner side portion, and the first resin is arranged on the outer peripheral surface of the inner side portion and the outer side portion And simultaneously supplying them.

Further, in one embodiment of the present invention, the second resin supply hole formed in the outer circumferential surface of the inner side portion, the second resin supply hole communicating with the second resin flow path, and the second resin supplied through the second resin supply hole, A pin guide hole which is formed to penetrate through the inner circumferential central portion and into which the valve pin can be raised and lowered and from which the first resin introduced from the first outer side portion is discharged; And a resin discharge hole for discharging the first resin and the second resin flowing through the circulation flow path and the fin guide hole.

According to an embodiment of the present invention, the second outer side portion may include a first resin circulation flow path connected to the first resin flow path, and a resin discharge portion for discharging the composite resin discharged from the inner side portion to the nozzle housing side Holes are further formed.

According to an embodiment of the present invention, the upper piston portion may include an upper housing having a plurality of upper air outlet holes through which air flows, and a first operation hole formed therein; An upper piston provided in the first operation hole and moving up and down according to inflow and outflow of air; A pin fixing member into which a valve pin is inserted and fixed to the upper piston to move up and down together with the upper piston; And a control unit.

According to an embodiment of the present invention, the nozzle housing may include a nozzle bushing for discharging the composite resin to the gate of the mold at a lower end thereof, a nozzle bushing connected to the nozzle housing for fixing the nozzle bushing, And a nozzle tip for preventing heat from being lost from the nozzle bushing and suppressing hardening of the discharged composite resin.

Also, in one embodiment of the present invention, the nozzle bush is made of an insert material of the same series so as to minimize the heat loss of the composite resin, and the inner surface of the nozzle bush is tapered at a constant angle, And an inclined flow path is formed so as to be able to be discharged to the gate side.

Also, in one embodiment of the present invention, the lower piston portion is formed at a lower portion of the upper piston portion, and a plurality of upper air outflow holes through which air flows in and out are formed in a lower outer circumferential surface, housing; And a lower piston having a guide hole formed at an upper portion thereof and passing through the valve pin, the lower piston being configured in the second operation hole.

According to an embodiment of the present invention, a split cover is further provided between the upper piston part and the lower piston part to prevent the supplied air from flowing out.

According to the present invention as described above, it is possible to supply various kinds of molten resins to a single discharge path so that the supply position and the supply timing of each other can be appropriately selected, and the resin layer can be arranged arbitrarily.

In addition, according to the present invention, the contents stored in the container can be stored for a long time and the freshness of the contents can be maintained for a long time by preventing the clogging caused by the external heat, thereby extending the shelf life of the contents.

According to the present invention, since the nozzle bush is made of an insert material of the same series so that the discharged composite resin can be prevented and suppressed by the cooling system of the mold, it is possible to inject a molded article of high quality .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a composite resin supply apparatus according to a preferred embodiment of the present invention;
2 is a perspective view schematically showing a composite resin supply apparatus according to a preferred embodiment of the present invention,
3 is a view showing a piston part of a composite resin supply apparatus according to a preferred embodiment of the present invention,
4 and 5 are views showing a nozzle unit of a composite resin supply apparatus according to a preferred embodiment of the present invention,
FIG. 6 to FIG. 8 are operation states showing the operation states of the composite resin supply apparatus according to the preferred embodiment of the present invention,
9 is a partial cross-sectional view of a container molded with a composite resin which has been extruded through a composite resin supply apparatus according to a preferred embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

2 is a perspective view schematically showing a composite resin supply apparatus according to a preferred embodiment of the present invention, and Fig. 3 is a cross-sectional view of a preferred embodiment of the present invention. Fig. FIGS. 4 and 5 are views showing a nozzle unit of a composite resin supply apparatus according to a preferred embodiment of the present invention, and FIGS. 6 to 8 are cross-sectional views showing a composite part according to a preferred embodiment of the present invention. Fig. 9 is a partial cross-sectional view of a container molded with a composite resin extruded through a composite resin supply device according to a preferred embodiment of the present invention. Fig.

As shown in the drawings, the present invention provides a composite resin supply apparatus comprising a resin supply unit 100 for supplying at least two or more kinds of composite resins, a valve pin (not shown) provided on the resin supply unit 100 for controlling the discharge of the composite resin, A piston assembly 200 for actuating the nozzle 110 and a nozzle assembly 300 connected to the resin supply unit 100 to receive the composite resin and discharge the supplied composite resin according to the operation of the valve pin 110, .

The resin supply part 100 is a component for supplying and supplying a plurality of composite resins toward the nozzle assembly 300. In particular, for producing a container such as beer, an ethylene vinyl alcohol copolymer (EVOH), a polypropylene (PP) Called composite resin) is supplied to the nozzle assembly 300 side.

The resin supply part 100 is provided with a plurality of resin supply paths which are separated and configured to supply the composite resin. The resin supply paths are connected to the first resin transfer path 304 of the nozzle assembly 300, And is configured to communicate with the second resin transfer path 306.

Here, the composite resin of the present invention is not limited to EVOH and PP resin, but may be made of various materials as long as the contents stored in the container can be prevented from being damaged by external light.

In addition, the PP resin of the present invention may be supplied as a first resin by mixing a certain amount with a tie resin in an adhesive so as to be adhered to an EVOH corresponding to a second resin having different physical properties.

As shown in FIG. 3, the piston assembly 200 is installed on an upper plate 202, through which air is supplied and discharged to support the upward and downward movement of the valve pin 110 by driving the upper and lower pistons, A lower piston portion 30 for upwardly and downwardly moving the valve pin 110 so that the resin is discharged, and an upper piston portion 20 for the secondary up-and-down movement of the valve pin 110.

The piston assembly 200 includes an upper housing 210 constituting an upper piston portion 20 and a lower housing 220 constituting a lower piston portion 30 which are separated from each other and the upper and lower housings 210 and 220 An upper piston 230 and a lower piston 240 for performing upward and downward sliding operations according to whether air is supplied to the upper and lower housings 210 and 220 and a split cover 250 for dividing the upper and lower housings 210 and 220 .

The upper housing 210 includes first and second air inflow and outflow holes 204 and 206 formed in an upper surface 202 of the upper plate 202 to supply and discharge air according to the upward and downward movement of the upper piston 230, First and second upper air outlets 212a and 212b are formed to communicate with each other.

A plurality of first operating holes 216 are formed in the upper housing 210 so as to be spaced apart from each other by a predetermined distance and an upper piston 230 having a piston operated upward or downward according to the air supplied therein .

The upper piston 230 is coupled to the first operation hole 216 of the upper housing 210 so as to be slidable upward and downward and has a pin fixing hole 232 And a fixing washer 234 for fixing the pin fixing member 260 and the upper piston 230 are formed.

At this time, the pin fixing hole 232 is formed with an insertion groove 236 into which the pin fixing member 260 for supporting the lower end of the valve pin 110 is inserted so that the first and second upper air outflow holes 212a, The pin fixing member 260 and the valve pin 110 move upward and downward together when the upper piston 230 is operated according to the supply amount of air flowing from the first and second pistons 212a and 212b.

The pin fixing member 260 has a fixing portion 262 formed at an upper portion thereof to support the lower portion of the head portion of the valve pin 110 and fixedly coupled to the upper piston 230. In the lowering operation of the upper piston 230, A pressing portion 264 for guiding the first downward movement of the valve pin 110 and pressing the lower piston 240 to lower the lower piston 240 is formed.

The lower housing 220 is formed on the lower side of the upper housing 210 and the second operation hole 226 is formed in the upper plate 202 so that the lower piston 240 can move up and down. A lower air outlet hole 222 communicating with the third and fourth air inflow holes 207 and 209 through which the air is supplied and discharged is formed along the outer circumferential surface of the lower housing 240 and a plurality of .

The split cover 250 is installed between the upper housing 210 and the lower housing 220 to prevent the air supplied to the upper housing 210 from flowing into the lower housing 220, And the lower piston 240 are smoothly and precisely operated.

The lower piston 240 is embedded in the second operating hole 226 of the lower housing 220 so as to be movable up and down and has a guide groove And a pin insertion hole 244 communicating with the lower side of the guide groove 242 and passing through the valve pin 110 is formed.

The split cover 250 is disposed between the upper and lower housings 210 and 220 to prevent the air flowing into the housings 210 and 220 from being mixed with each other, The first and second actuating holes 216 and 226 formed in the first and second actuating holes 216 and 226 are maintained in a vacuum state so that the pistons 230 and 240 are precisely operated. A guide hole 252 is formed which is guided so as to be inserted into the guide hole 242 formed in the lower piston 240 while moving downward in accordance with the descending movement of the lower piston 240.

4 and 5, the nozzle assembly 300 is configured such that the valve pin 110 is received therein, and the first resin, that is, the PP resin, of the composite resin is introduced and discharged, and the second resin A first outer side 420 to which a first resin (PP resin) and a second resin (EVOH) are supplied so as to surround the outer peripheral surface of the inner bush 310, And an outer case 320 having a second outer case 430 through which the second resin is discharged and the first and second resins discharged from the inner case 310 are discharged and a nozzle housing 340, do.

The inner side seal 310 has a pin guide hole 313 coupled to the first outer seal 420 and having an inner circumferential center portion penetrating from the upper side to the lower side and inserted into the valve pin 110 such that the lower end of the valve pin 110 can move up and down And a resin discharge hole 318 is formed so that the first resin discharges in accordance with whether the valve pin 110 moves upward or downward.

The inner side seal 310 includes a second resin supply hole 312 communicating with the second resin flow channel 324 of the outer bush 320 to be described later and supplying the second resin to the resin discharge hole 318 side, .

The second resin circulation flow path 316 is formed on the outer circumferential surface of the inner side seal 310 so that the second resin supplied through the second resin supply hole 312 is circulated and discharged.

The outer side part 320 is connected to the resin supplying part 100 through a fixing bolt or the like and includes a first outer side part 420 to which the first and second resin are supplied, And a second outer side portion 430 formed with a first resin flow path 322 and a second resin flow path 324 connected to the first and second resin flow paths 304 and 306 formed in the first outer side portion 420, ).

The first outer side seal 420 is connected to the resin supply part 100 and prevents leakage of the resin to be supplied. The resin supplied to the resin supply part 100, which is communicated with the plurality of resin supply paths, The first and second resin transfer paths 304 and 306 are formed so as to be able to flow into the inner bush 310 and the outer bush 320 of the mold 300.

The first outer side seal 420 is formed with a pin through hole 308 through which the lower portion of the valve pin 110 penetrates to open and close the resin discharge hole 318 formed in the inner side seal 310.

Here, the first resin transfer path 304 formed in the first outer side 420 is formed so that one side thereof is branched so as to communicate with the pin through-hole 308.

That is, the first resin transfer path 304 is formed to communicate with the pin guide hole 313 formed in the inner bushing 310 through the pin through hole 308, so that the first resin supplied from the resin supplying portion 100 The first resin flow path 322 and the first resin circulation flow path 326 formed in the outer bushing 320 are connected to each other through the pin guide hole 313 of the inner bush 310, (360).

The inner bush 320 is inserted into the second outer side seal 430 and the composite resin discharged from the inner bush 310 is discharged to the nozzle bush 360 of the nozzle housing 340 The resin discharge hole 328 is formed.

The first resin circulation channel 410 is connected to the first resin flow channel 322 and supplies the first resin to the nozzle bush 430 of the nozzle housing 340 while circulating the first resin. (326) are formed.

Here, the first resin flow path 322 formed in the second outer side portion 430 is vertically formed so that the upper side is connected to the first resin transfer path 304 and the lower side is connected to the first resin circulation path 326 .

The upper side of the second resin flow path 324 is connected to the second resin flow path 306 and the lower side of the second resin flow path 324 is connected to the second resin supply hole 312 formed in the inner side bushing 310, The second resin circulation flow path 316 formed on the outer circumferential surface of the resin discharge hole 318 is circulated and moved toward the resin discharge hole 318 to be discharged.

The nozzle housing 340 is configured such that the outer bush 320 is inserted, the outer side seal 320 is fixed to the resin supply part 100, and the first and second resin are discharged to the gate side of the mold.

The nozzle housing 340 has a nozzle bushing 360 for discharging the composite resin to the gate of the mold at a lower end thereof and a nozzle bushing 360 for fixing the nozzle bushing 360. The nozzle bushing 360 is fixed by the cooling system of the mold, And a nozzle tip 350 for preventing and inhibiting the sticking.

The nozzle bushing 360 minimizes the heat loss of the composite resin and is manufactured from a copper-based insert material having good thermal conductivity.

The nozzle bushing 360 is disposed at a lower portion of the second outer circumference 430 and forms a predetermined space with the lower end of the second outer circumference 430. The nozzle bush 360 is tapered at a predetermined angle, The inclined flow path 362 is formed so that the first resin flowing through the second resin layer 326 can be discharged to the gate side of the mold.

The nozzle tip 350 is detachably coupled to the lower end of the nozzle housing 340 to match the outer surface of the nozzle bushing 360 to fix the position of the nozzle bushing 360, So that the temperature distribution of the discharge portion formed at the end portion of the discharge port can be kept constant.

In the meantime, the nozzle housing 340 of the present invention further includes a temperature adjusting member 370 configured to surround the outer circumferential surface to maintain the temperature of the composite resin.

The composite resin supply apparatus of the present invention having the above-described structure is configured to supply the ethylene vinyl alcohol copolymer (EVOH) and the polypropylene (PP) resin to the mold side through the fourth air inflow / The lower piston 240 is moved upward by the pressure of the air so that the pin fixing member inserted into the guide hole 242 of the lower piston 240 The upper piston 230 and the valve pin 110 are simultaneously moved upward.

7, the upward movement of the lower piston 240 is performed in the range of 16 mm to 18 mm, so that the lower end of the valve pin 110 located in the nozzle bushing 360 is moved to the second The first resin circulating through the first resin circulating flow path 326 formed on the outer periphery of the second outer side seal 430 can be prevented from being discharged from the nozzle bush 360 .

After the discharge of the first resin is completed, the air supplied to the second operation hole 226 of the lower housing 220 flows out through the third air inflow / outflow hole 207 and the second air inflow / outflow hole 206 To be supplied.

The upper pinion 230 moves upward to move the pin fixing member 260 and the valve pin 110 upward and the valve pin 110 is moved upward by the resin discharge hole 328 formed in the second outside portion 430, .

The lower end of the valve pin 110 located in the resin discharge hole 328 is connected to the lower end of the resin boss 310 of the inner bush 310 by the upward movement of the upper piston 230 in the range of 6 mm to 9 mm, Only the second water circulating through the second resin circulation flow path 316 formed on the outer periphery of the inner bush 310 is discharged toward the resin discharge hole 328 side by not opening the first bushing 318, So that extrusion molding is performed on the inner surface of the resin.

When the discharge of the second resin is completed, the supply amount of the air supplied to the second air inflow / outflow hole 204 is increased, and the upper piston 230 is further moved upward so that the lower end of the valve pin 110 is moved The resin discharge hole 318 formed in the first resin transfer path 310 is opened to discharge the first resin supplied through the branched first resin transfer path 304, So that the container as shown in FIG. 9 is extrusion-molded.

The thus configured composite resin supply device can supply various kinds of molten resins to a single discharge path formed in the nozzle bushing 360 so that the supply position and the supply timing of the molten resin can be appropriately selected, The contents stored in the container can be stored for a long time and the freshness of the contents can be maintained for a long time by preventing the deterioration caused by the external heat for a long time and thus the shelf life of the contents can be extended.

The foregoing description is merely illustrative of the technical idea of the present invention and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100: resin supply part 110: valve pin
200: piston assembly 210: upper housing
220: lower housing 230: upper piston
240: lower piston 242: guide hole
244: pin insertion hole 250: split cover
252: guide hole 260: pin fixing member
300: nozzle assembly 310: inner bushing
316: second resin circulation flow path 318: resin discharge hole
320: outer bush 322: first resin channel
324: second resin flow path 326: first resin circulation flow path
328: resin discharge hole 340: nozzle housing
350: nozzle tip 360: nozzle bush
420: first outside portion 430: second outside portion

Claims (10)

A resin supply portion in which a plurality of resin supply channels for supplying a composite resin including a first resin composed of PP (polypropylene) resin and a second resin composed of EVOH (ethylene vinylalcohol copolymer) are formed;
A piston assembly including a lower piston portion for primarily lifting and lowering the valve pin so as to discharge the composite resin, and an upper piston portion for performing a secondary up-and-down movement of the valve pin; And
An outer side which is supplied with the composite resin through the resin supply passage and through which the second resin is discharged while circulating the outer circumferential surface and in which the composite resin is discharged in accordance with the operation of the valve pin,
A first resin inserted into the inside of the outer bush and discharged while circulating along the outer circumferential surface of the second resin,
And a nozzle assembly including a nozzle housing into which the outer bush is inserted and which discharges the composite resin discharged through the outer and inner sides to the gate side of the mold.
The method according to claim 1,
In the outer side portion
A first outer side portion connected to a plurality of resin supply paths formed in the resin supply portion and having first and second resin transfer paths through which the first and second resin are supplied to the inside and outside sides; And
The first resin passage and the second resin passage are formed at a lower portion of the first outer side portion and inserted into the inner side portion and connected to the first and second resin paths, A second outer side portion for discharging the composite resin to the nozzle housing side;
And a second resin supplying unit for supplying the second resin to the second resin supplying unit.
3. The method of claim 2,
Wherein the first resin flow path is formed so that one side is branched and communicated with the inside of the inside side portion so that the first resin is simultaneously supplied to the outer circumferential surface at the inside and outside side portions at the inside side portion, .
3. The method of claim 2,
A second resin supply hole formed on an outer peripheral surface of the inner side portion and communicating with the second resin flow path,
A second resin circulating flow path through which the second resin supplied through the second resin supplying hole circulates,
A pin guide hole formed in the center of the inner periphery to insert the valve pin upward and downward and to discharge the first resin introduced from the first outer side,
A resin discharge hole for discharging the first resin and the second resin flowing through the second resin circulating passage and the pin guide hole,
Is further configured.
3. The method of claim 2,
The second outer side portion
A first resin circulation flow path connected to the first resin flow path,
A resin discharge hole for discharging the composite resin discharged from the inner side portion to the nozzle housing side,
Is further configured.
The method according to claim 1,
The upper piston portion
An upper housing formed with a plurality of upper air outlet holes through which air flows, and a first operating hole formed therein;
An upper piston provided in the first operation hole and moving up and down according to inflow and outflow of air;
A pin fixing member into which a valve pin is inserted and fixed to the upper piston to move up and down together with the upper piston;
And a second resin supplying unit for supplying the second resin to the second resin supplying unit.
The method according to claim 1,
The nozzle housing has a nozzle bushing for discharging the composite resin to the gate of the mold at the lower end,
A nozzle tip for preventing the heat of the nozzle bush from being lost by the cooling system of the mold to prevent the discharged composite resin from hardening,
Further comprising: a second resin supplying unit for supplying a resin to the first resin;
8. The method of claim 7,
The nozzle bushing is made of an insert material of the same type so as to minimize the heat loss of the composite resin to the ground,
Wherein the inclined flow path is formed so that the inner surface is tapered at a predetermined angle so that the first resin can be discharged to the gate side of the mold.
The method according to claim 1,
The lower piston portion
A lower housing formed at a lower portion of the upper piston and having a plurality of upper air outflow holes through which air flows in and out of a lower outer circumferential surface, And
And a guide hole is formed in an upper portion thereof, and a lower piston
And a second resin supplying unit for supplying the second resin to the second resin supplying unit.
The method according to claim 1,
And a split cover is provided between the upper piston part and the lower piston part to prevent the supplied air from flowing out.

Images