JP2005132026A - Hot runner nozzle and hot runner nozzle unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To adversely affect molding by the positional dislocation of a gate caused by the thermal expansion of a hot runner nozzle. <P>SOLUTION: A lengthy nozzle main body 35 forming a resin passage 34 extending in the longitudinal direction X is composed of first and second split bodies 36 and 37 separable in the longitudinal direction X. The resin passage 34 includes first and second resin passages 38 and 39 which are formed in the first and second split bodies 36 and 37 respectively and communicate with each other. In the opposite end parts 36b and 37a of the first and second split bodies 36 and 37, the engagement projection 47 of the second split body 37 is engaged slidably in the longitudinal direction X with the engagement recess 48 of the first split body 36. The thermal expansion of the split bodies 36 and 37 is absorbed by adjusting the engagement lengths of the engagement projection 47 and the engagement recess 48. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an edge gate type hot runner nozzle and a hot runner nozzle unit including the same.

Typically, the hot runner nozzle is long, and the resin in the resin passage extending in the longitudinal direction is heated in a molten state by a heater (for example, Patent Document 1).
In the hot runner nozzle, a molten resin injection port is formed at one end thereof, and a gate is provided corresponding to the injection port.
Japanese Patent Laid-Open No. 7-24891

The hot runner nozzle has a longer length due to thermal expansion at a high temperature heated by the heater than at a low temperature not heated by the heater.
For this reason, at the time of use, the position of the injection port at one end of the hot runner nozzle is shifted, and as a result, the gate position is shifted, which may adversely affect the molded product.
Therefore, it is also conceivable to design the hot runner nozzle in consideration of the amount of displacement during thermal expansion. However, the temperature varies depending on the type of synthetic resin used, molding conditions, etc., and the amount of displacement during thermal expansion varies greatly depending on the temperature. Therefore, it is very difficult to accurately set the amount of displacement during thermal expansion in advance.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a hot runner nozzle and a hot runner nozzle unit that are not easily affected by thermal expansion.

  In order to achieve the above object, the present invention includes a long nozzle body that forms a resin passage extending in the longitudinal direction, and the nozzle body includes a first divided body and a nozzle tip on the nozzle base side that are separable in the longitudinal direction. The resin passages include first and second resin passages that are respectively provided in the first and second divided bodies and communicate with each other, and are formed of the first and second divided bodies. A fitting convex part provided in one of the divided bodies at the opposite end is fitted in a fitting concave part provided in the other divided body so as to be slidable in the longitudinal direction of the nozzle body. Provide hot runner nozzle.

  According to the present invention, the first and second divided bodies constituting the nozzle body are fitted with the fitting convex portions and the fitting concave portions that are slidable in the longitudinal direction of the nozzle main body. Even if it expand | extends by expansion | swelling, this can be absorbed by the increase in the fitting length of a fitting convex part and a fitting recessed part. As a result, the overall length of the nozzle body can be kept constant, and changes in the gate position due to thermal expansion can be prevented. Further, by dividing the nozzle body, it is easy to incorporate the hot runner nozzle into the mold, and it is possible to cope with various mold structures, thereby improving the degree of freedom in design. For example, the second divided body can be used in common, and only the first divided body can be used with various lengths depending on the mold.

  In the present invention, a sleeve further interposed between the opposed end portions of the first and second divided bodies and defining a connection path connecting the first and second resin passages to each other, the first and second In some cases, the pair of end faces of the sleeve can be brought into liquid-tight contact with the opposing surfaces of the first and second divided bodies during thermal expansion of the divided body. In this case, when the first and second divided bodies are thermally expanded, the pair of end surfaces of the sleeve are in liquid-tight contact with the surfaces of the corresponding first and second divided bodies, respectively, thereby preventing resin leakage. it can.

  The present invention may further include an injection port forming member including a molten resin injection port communicating with the second resin passage, and the second divided body may include a holding hole capable of fitting and holding the injection port forming member. is there. If the injection port forming member is configured separately from the second divided body, the injection port can be easily processed into various complicated shapes. In addition, the application range can be greatly widened by replacing and using various types of injection port forming members having different shapes (injection tip shapes) that form the injection port. Furthermore, it becomes very easy to perform a process suitable for the injection port forming member or to use a material suitable for the injection port forming member. For example, various surface treatments and quenching can be easily performed for the purpose of improving the wear resistance of the resin passage in the injection port forming member or increasing the strength of the injection port tip that is easily damaged by molten resin pressure because of its thinness. Become. Moreover, the injection port forming member can be formed of a high strength separate material. Further, in the hot runner nozzle, the heat transfer tends to decrease toward the tip, but as a solution, it is easy to form the injection port forming member with a material having good heat transfer.

  In the present invention, the holding hole includes a through-hole penetrating the second divided body in a direction orthogonal to the longitudinal direction, and the injection port forming member includes a pair of end portions protruding on both sides of the through-hole, The outlet may be formed at each end of the injection port forming member. In this case, it is particularly suitable for multi-cavity picking, and it is also preferable in that the injection port forming member is not likely to be pulled out from the holding hole due to the molten resin pressure.

In the present invention, the injection port forming member may be fitted to the holding hole of the second divided body using shrink fitting or cold fitting. In this case, the fitting strength between the injection port forming member and the holding hole can be increased.
In the present invention, there may be further provided first and second heaters provided independently of each other, and the first and second heaters may be held by the first and second divided bodies, respectively. In this case, independent temperature control is possible for the first divided body on the base side and the second divided body on the tip side. For example, the first divided body is always kept at a high temperature, and the resin in the first resin passage is kept in a molten state, while the second divided body is kept at a high temperature only at the time of injection, and after filling the mold with the resin. Can be controlled to stop heating and lower the temperature so that the resin does not flow out of the nozzle tip.

  The present invention also includes a hot runner nozzle described above, a holder connected to the first divided body of the hot runner nozzle, surrounding the second divided body with a gap, and a built-in holder. A hot wrench nozzle unit comprising a cooling water path is provided. According to the present invention, by providing a cooling water pipe in addition to heat insulation by air existing in the gap, heat transfer from the hot runner nozzle heated to a high temperature to the mold is suppressed, and the molding in the mold is adversely affected. Can be prevented.

In the present invention, when the holder includes an opening for forming a gate by facing the tip of the portion forming the injection port of the hot runner nozzle, the holder also serves as a so-called gate bush. The structure can be simplified.
In the present invention, the holder may be a combination of a pair of split holders that can be split at the gate position. In this case, the assembly of the hot runner nozzle unit is facilitated and the assembly into the mold is facilitated.

A preferred embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic sectional view of an injection mold using a hot runner nozzle according to an embodiment of the present invention. Referring to FIG. 1, an injection mold 8 includes a fixed mold plate 9 and a movable mold plate 10 that are clamped together. The stationary template 9 is fixed to the stationary side mounting plate 11. The holding blocks 12 and 13 are interposed between the fixed mold plate 9 and the fixed side mounting plate 11 and are fixed to the fixed side mounting plate 11. The holding blocks 12 and 13 hold the hot runner nozzle unit 1.

The hot runner nozzle unit 1 extends from the fixed mounting plate 11 side toward the movable mold plate 10, and a pair of gates G are provided at opposing positions on the side of the front end portion 1 a of the hot runner nozzle unit 1. ing.
A pair of cores 15 are fixed to the fixed mold 9 on both sides of the hot runner nozzle unit 1. The stationary template 9 includes a first block 9a and a second block 9b. The second block 9b is connected to the first block 9a so that the molded product can be ejected away from the first block 9a at the time of mold release, and also serves as an ejection plate. PL is a parting line.

The movable template 10 includes a first block 10a, a second block 10b, and a third block 10c. The movable mold plate 10 is fixed to the movable side mounting plate 16, and an intermediate block 17 is interposed between the movable mold plate 10 and the movable side mounting plate 16.
A molding cavity 18 is formed by the fixed mold plate 9 and the movable mold plate 10. A cooling water pipe 19 serving as a cooling path is disposed in the first and second blocks 10 a and 10 b of the movable template 10 so as to surround the cavity 18.

  Referring to FIG. 2, hot runner nozzle unit 1 is called an edge gate type, and is provided with a pair of gates G that are opposite to each other along a direction orthogonal to longitudinal direction X. The hot runner nozzle unit 1 includes a hot runner nozzle 30 formed by combining first and second divided units 31 and 32 that are separable in the longitudinal direction X, and a holder 33 that also serves as a gate bush.

  3 and 4, the hot runner nozzle 30 includes a long nozzle body 35 that forms a resin passage 34 extending in the longitudinal direction X, and the nozzle body 35 is a nozzle base that is separable in the longitudinal direction X. The first divided body 36 on the side and the second divided body 37 on the nozzle tip side are included. The resin passage 34 includes first and second resin passages 38 and 39 provided in the first and second divided bodies 36 and 37 of the nozzle body 35 and communicating with each other.

  The first divided body 36 of the nozzle body 35 has a thick cylindrical shape that partitions the first resin passage 38. A spiral groove 40 as a heater accommodating portion is formed in the outer peripheral surface 36a of the first divided body 36, and a first heater 41 for keeping the resin in a molten state in the first resin passage 38 in the spiral groove 40. Is housed. The first heater 41 surrounds the first divided body 36 in a spiral shape. A protective sleeve 42 for covering the first heater 41 is fitted on the outer peripheral surface 36a of the first divided body 36 so as to be freely slidable. In addition to protecting the first heater 41, the protective sleeve 42 functions to insulate the heat of the first heater 41 from being transmitted to the outside.

A first divided unit 31 is configured including the first divided body 36 of the nozzle body 35, the first heater 41, and the protective sleeve 42.
On the other hand, the second divided unit 32 includes a second divided body 37 having a rectangular parallelepiped shape that divides the second resin passage 39, and the resin contained in the second resin passage 39 contained in the second divided body 37. The second heater 43 (see FIG. 8) for maintaining the molten state, the injection port forming member 45 (see also FIG. 5) for forming the injection port 44 of the molten resin, and the injection port forming member 45 are fixed. And a cover 80 as an adjusting means for adjusting the relative position of the second divided body 37 and the holder 33 with respect to the longitudinal direction X. The first heater 41 and the second heater 43 are provided independently of each other and are held directly or indirectly by the corresponding first and second divided bodies 36 and 37, respectively. Although not shown, temperature sensors are built in the first and second divided bodies 36 and 37.

  The cylindrical fitting convex part 47 formed in the edge part 37a of the 2nd division body 37 in the edge parts 36b and 37a which the 1st and 2nd division bodies 36 and 37 mutually oppose is 1st division | segmentation. A fitting recess 48 formed in the end 36 b of the body 36 is fitted so as to be slidable in the longitudinal direction X. With reference to FIG. 6, a slight gap 49 is formed between the end surface 47a of the fitting convex portion 47 and the bottom surface 48a of the fitting concave portion 48 opposed to the end surface 47a.

Further, concave portions 50 and 51 are formed on the end surface 47a of the fitting convex portion 47 and the bottom surface 48a of the fitting concave portion 48, respectively, and the concave portions 50 and 51 face each other. For example, a metal sleeve 52 is interposed between the end portions 36 b and 37 a of the first and second divided bodies 36 and 37 in such a manner as to straddle these concave portions 50 and 51.
The sleeve 52 has a cylindrical shape that defines a connection path 53 that connects the first and second resin passages 38 and 39 to each other. When the first and second divided bodies 36 and 37 of the nozzle body 35 are thermally expanded, the pair of end faces 52a and 52b of the sleeve 52 are respectively used as surfaces of the first and second divided bodies 36 and 37 facing each other. The bottom surfaces 50a and 51a of the recesses 50 and 51 can be liquid-tightly contacted.

  Referring to FIG. 8, the second divided body 37 is formed with a heater accommodation hole 71 as a heater accommodation portion along the longitudinal direction X, and the second heater 43 is accommodated in the heater accommodation hole 71. . 3 and 5, the injection port forming member 45 has a columnar intermediate portion 45a and a pair of end portions 45b sharpened conically. A pair of injection ports 44 are formed at each end 45a (only one is shown in the figure). A radial hole 54 that communicates with the second resin passage 39 is formed in the intermediate portion 45a, and an axial hole 55 that reaches each injection port 44 from the radial hole 54 is formed. The gate G is partitioned and formed when the tip 45c of the conical end 45b of the injection port forming member 45 faces an opening 67 described later of the holder 33.

The second divided body 37 is formed with a holding hole 56 capable of fitting and holding the injection port forming member 45. The holding hole 56 includes a through hole that penetrates the second divided body 37 in a direction orthogonal to the longitudinal direction X. The pair of end portions 45 b of the injection port forming member 45 inserted into the holding hole 56 formed of the through hole protrudes on both sides of the holding hole 56.
The injection port forming member 45 is fitted into the holding hole 56 of the second divided body 37 using shrink fitting or cold fitting. That is, the injection port forming member 45 is fitted in a state in which the second divided body 37 is heated to expand the diameter of the holding hole 56, or the holding hole 56 is in a state in which the diameter is reduced by cooling the injection port forming member 45. To fit in. The clearance between the two 45 and 56 after fitting is, for example, zero or negative (press-fit state).

  A screw hole 57 is formed in the distal end portion 37 b of the second divided body 37 on the extension of the second resin passage 39, and the screw 46 as the fixing means is screwed into the screw hole 57. ing. The screw 46 is locked to, for example, a locking recess on the peripheral surface of the injection port forming member 45 to prevent the injection port forming member 45 from being detached from the holding hole 56. The screw 46 also functions as a stopper that prevents resin leakage from the second resin passage 39.

Further, the cover 80 as the adjusting means is formed on the end surface 37c of the second divided body 37 as shown in FIG. 3 in order to close the heater accommodating hole 71 (see FIG. 8) for the second heater 43. It is fixed by a fixing screw 81. By using the cover 80 having a different thickness, the length of the second divided body 37 in the longitudinal direction X is adjusted.
As shown in FIGS. 3 and 7, the holder 33 is formed by combining first and second divided holders 58 and 59 that can be divided at the position of the gate G. As shown in FIG. 8, the first and second divided holders 58 and 59 are connected to each other using a connecting pin 60 and a bolt (not shown).

The holder 33 is connected to the first divided unit 31 including the first divided body 36 and surrounds the second divided unit 32 including the second divided body 37 with a gap S therebetween.
The first split holder 58 has a cylindrical shape, and the first split body 36 and the protective sleeve 42 of the first split unit 31 are respectively fitted to one end 58a of the first split holder 58. And the 2nd fitting recessed parts 61 and 62 are formed.

As shown in FIG. 8, the other end 58b of the first split holder 58 is combined with one end 59a of the second split holder 59, and an opening 67 is formed between them. The gate G is defined and formed by the tip 45c of the conical end 45b of the injection port forming member 45 facing the opening 67.
Further, a fixing portion 63 that protrudes in a flange shape is provided at one end 58a of the first split holder 58, and the fixing portion 63 is held by using a fixing screw 65 that passes through the screw insertion hole 64 of the fixing portion 63. 13 is fixed. A gas vent hole 66 is formed in the side portion of the first split holder 58 in the vicinity of the fixed portion 63.

  The second split holder 59 has a rectangular container shape, and a bottom 68 as a facing portion of the other end 59b of the second split holder 59 faces and receives the cover 80 as the adjusting means. Thereby, according to the thickness of the cover 80, the relative position of the 2nd division body 37 and the holder 33 is adjusted regarding the longitudinal direction X, As a result, the fitting length of the fitting convex part 47 and the fitting recessed part 48 is adjusted. Thus, the amount of the gap 49 (see FIG. 6) is adjusted.

As shown in FIG. 8, a cooling water path 69 is built in the holder 33 so as to straddle the first and second divided holders 58 and 59. The cooling water path 69 communicates with the cooling water path 70 of the holding block 13.
According to the present embodiment described above, the fitting convex portion 47 and the fitting concave portion that can slide the first and second divided bodies 36 and 37 constituting the nozzle main body 35 in the longitudinal direction X of the nozzle main body 35. Since the fitting is performed at 48, even if each of the divided bodies 36 and 37 is expanded by thermal expansion, it can be absorbed by an increase in the fitting length of the fitting convex portion 47 and the fitting concave portion 48. As a result, the entire length of the nozzle body 35 can be kept constant, and a change in the position of the gate G due to thermal expansion can be prevented.

  In addition, by dividing the nozzle body 35, the hot runner nozzle 30 can be easily incorporated into the mold, and various mold structures can be supported, thereby improving the degree of freedom in design. For example, the second divided body 37 can be used in common, and only the first divided body 37 can be used with various lengths depending on the mold. Alternatively, the second division unit 32 can be used in common, and only the first division unit 31 can be used with various lengths depending on the mold.

  Further, when the first and second divided bodies 36 and 37 are thermally expanded, the pair of end faces 52a and 52b of the sleeve 52 forming the connection path 53 between the first and second resin passages 38 and 39 correspond to each other. It is possible to liquid-tightly contact the bottom surfaces 50a and 51a of the recesses 50 and 51 of the first and second divided bodies 36 and 37 to prevent resin leakage. If a metal O-ring is used, since the contact area is small, the surface pressure becomes too high and plastic deformation is caused by one-time fitting use, so that resin leakage cannot be reliably prevented.

  Further, since the injection port forming member 45 is fitted and held in the holding hole 56 of the second divided body 37, the following advantages are obtained. That is, if the injection port forming member 45 is configured separately from the second divided body 37, the injection port 44 can be easily processed into various complicated shapes. In addition, by replacing and using the injection port forming member 45 having various specifications having different shapes (injection tip shapes) of the end portion 45b that is a portion that forms the injection port 44, the applicable range is remarkably widened.

  Furthermore, it becomes very easy to perform a process suitable for the injection port forming member 45 or to use a material suitable for the injection port forming member 45. For example, various surface treatments or quenching can be easily performed for the purpose of improving the wear resistance of the resin passage in the injection port forming member 45 or increasing the strength of the tip 45c that is easily broken due to the molten resin pressure because it is thin. . Moreover, the injection port forming member 45 can be formed of a high-strength separate material. Further, in the hot runner nozzle 30, heat transfer tends to decrease toward the tip. As a solution, the injection port forming member 45 may be formed of a material having good heat conductivity such as an aluminum alloy or a copper alloy. It becomes easy.

In particular, the injection ports 44 are formed at both ends 45b of the injection port forming member 45, and both the ends 45a are held in a state of projecting on both sides of the holding holes 56 of the second divided body 37, so It is particularly suitable for removal, and there is no fear that the injection port forming member 45 will be pulled out of the holding hole 56 by the molten resin pressure.
Further, since the injection port forming member 45 is fitted to the holding hole 56 of the second divided body 37 by shrink fitting or cold fitting, the fitting strength between the injection port forming member 45 and the holding hole 56 is increased. Can be high. In addition, since the injection port forming member 45 is fixed by the screw 46, the removal of the injection port forming member 45 from the holding hole 56 can be reliably prevented.

  In addition, since the first and second heaters 41 and 43 are built in the first and second divided bodies 36 and 37, respectively, the first divided body 36 on the nozzle base side and the second divided body 36 on the nozzle tip side. The divided body 37 enables independent temperature control. For example, the first divided body 36 is always kept at a high temperature to keep the resin in the first resin passage 38 in a molten state, while the second divided body 37 is kept at a high temperature only at the time of injection, After filling the resin, the heating is stopped to lower the temperature, and it is possible to control so that the resin does not flow out from the gate G at the nozzle tip.

In addition, the holder 33 surrounds the second divided body 37 with a gap S, and has a built-in cooling water passage 69, and uses cooling water in addition to heat insulation by air existing in the gap S. It is possible to suppress the heat transfer from the hot runner nozzle 30 to the mold and prevent the mold from being adversely affected.
Further, the holder 33 also serves as a so-called gate bush, and the structure can be simplified.

Further, the position of the second divided body 37 with respect to the holder 33 can be easily adjusted by allowing the cover 80 to be received by the bottom 68 of the holder 33 with the thickness of the cover 80 adjusted. Adjustment of the fitting length of the fitting convex part 47 and the fitting concave part 48 can be performed easily.
Further, since the holder 33 is configured by combining the first and second divided holders 58 and 59 that can be divided at the position of the gate G, the assembly of the hot runner nozzle unit 1 is facilitated, and the holder 33 is also incorporated into the mold. It becomes easy.

In addition, this invention is not limited to the said embodiment, A fitting convex part can be provided in the 1st division body 36, and a fitting recessed part can also be provided in the 2nd division body 37. FIG.
Alternatively, an injection port forming member 45 having an injection port 44 only at one end can be used. In this case, the injection port forming member 45 may be provided separately on the left and right.
In addition, the injection port forming member 45 can be formed integrally with the second divided body 37 by a single member.

In the above embodiment, the first heater 41 is disposed in the spiral groove 40 of the outer peripheral surface 36a of the first divided body 36. However, the spiral groove 40 is abolished and the outer peripheral surface 36a of the first divided body 36 is removed. You may make it wind.
Further, the first and second heaters 41 and 43 are not limited to a heater shape such as a plate shape or a rod shape, and a mode of attachment to the first and second divided units 31 and 32.

It is a schematic sectional drawing of the metal mold | die for injection molding using the hot runner nozzle of one embodiment of this invention. It is an expanded sectional view of the principal part of the metal mold | die for injection molding. It is a partially broken side view of a hot runner nozzle unit. It is a partially broken side view of a hot runner nozzle. It is a schematic perspective view of an injection port formation member. It is sectional drawing of the mutual fitting part of the 1st and 2nd division body. It is a partially broken side view of the hot runner nozzle unit with the second divided holder removed. It is an expanded sectional view of the principal part of the metal mold | die for injection molding.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot runner nozzle unit 8 Injection mold 9 Fixed mold plate 10 Movable mold plate 11 Fixed side mounting plates 12, 13 Holding block 15 Core 18 Cavity 30 Hot runner nozzle 31 First divided unit 32 Second divided unit 33 Holder S Gap 34 Resin passage 35 Nozzle body X Longitudinal direction 36 First divided body 36b End portion 37 Second divided body 37a End portion 37b End portion 38 First resin passage 39 Second resin passage 40 Spiral groove (heater Containment)
41 1st heater 42 Protection sleeve 43 2nd heater 44 Injection port 45 Injection port formation member 45b End part (part which forms an injection port)
45c Tip 46 Screw (fixing means)
47 fitting convex part 47a end face 48 fitting concave part 48b bottom face 49 gap 50, 51 concave part 50a, 50a bottom face 52 sleeve 52a, 52b end face 53 connection path 54 radial hole 55 axial hole 56 holding hole 57 screw hole 58 first Split holder 59 Second split holder 60 Connecting pin 63 Fixing part 65 Fixing screw 67 Opening 68 Bottom (opposing part)
69 Cooling water passage 71 Heater accommodation hole (heater accommodation part)
80 Cover (Adjustment means)
G Gate

Claims (9)

It has a long nozzle body that forms a resin passage extending in the longitudinal direction,
The nozzle body includes a first divided body on the nozzle base side separable in the longitudinal direction and a second divided body on the nozzle tip side,
The resin passage includes first and second resin passages provided in the first and second divided bodies and communicating with each other,
The fitting convex portion provided in one of the divided bodies at the opposite end portions of the first and second divided bodies is slidable in the longitudinal direction of the nozzle body in the fitting concave portion provided in the other divided body. A hot runner nozzle characterized by being fitted. The sleeve according to claim 1, further comprising a sleeve that is interposed between opposed end portions of the first and second divided bodies and that defines a connection path that connects the first and second resin passages to each other.
A hot runner nozzle, wherein the pair of end faces of the sleeve can be in liquid-tight contact with the opposing surfaces of the first and second divided bodies, respectively, during thermal expansion of the first and second divided bodies. In Claim 1 or 2, further comprising an injection port forming member including a molten resin injection port communicating with the second resin passage,
The hot runner nozzle, wherein the second divided body includes a holding hole capable of fitting and holding the injection port forming member. In Claim 3, the holding hole includes a through hole penetrating the second divided body in a direction orthogonal to the longitudinal direction,
The injection port forming member includes a pair of end portions projecting on both sides of the through hole,
The hot runner nozzle, wherein the injection port is formed at each end of the injection port forming member.   5. The hot runner nozzle according to claim 3, wherein the injection port forming member is fitted into the holding hole of the second divided body using shrink fitting or cold fitting.   6. The apparatus according to claim 1, further comprising first and second heaters provided independently of each other, wherein the first and second heaters are held by the first and second divided bodies, respectively. A hot runner nozzle characterized by that. A hot runner nozzle according to any one of claims 1 to 6;
A holder surrounding the second divided body of the hot runner nozzle with a gap;
A hot wrench nozzle unit comprising a cooling water path built in the holder.   8. The hot runner nozzle unit according to claim 7, wherein the holder includes an opening for forming a gate by facing a tip of a portion forming an injection port of the hot runner nozzle.   9. The hot runner nozzle unit according to claim 7, wherein the holder is a combination of a pair of split holders that can be split at a gate position.

Images