Separator

Abstract

To provide a separator that reduces a contact area with a die recess portion, an adjacent separator, and the like, and prevents rotation in an axial direction or radial direction even when a molten resin enters between the separators.SOLUTION: In a molding apparatus including a cylindrical die 20 and a core 30 that forms a flow path for a molten resin between the die 20 and itself, separators 40 are accommodated in a die recess 23 formed in the die 20 and is attached in a plurality of positions so as to be movable in an axial direction of the die 20. The separator 40 has a separator inner peripheral surface 42 located on a core 30 side, a separator outer peripheral surface 45 located on an opposite side to the core 30 side, and two separator side surfaces 48 connected to the separator inner peripheral surface 42 and the separator outer peripheral surface 45. At least one of the separator side surfaces 48 is formed with a separator side surface recess 52 recessed from a surface of the separator side surface 48.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a molding apparatus including a cylindrical die and a core arranged inside the die and movable in the axial direction of the die, forming a flow path for molten resin between the die and the core, wherein a plurality of separators are accommodated in a die recess formed in a ring shape in the radial direction of the die and opening to one end side in the axial direction of the die, and are attached so as to be movable in the axial direction of the die. [Background technology]

[0002] As shown in FIG. 7 , Patent Document 1 discloses a cylindrical die 200, a core 300 that is disposed inside the die 200 and is movable relative to the die 200 in the axial direction of the die 200 and forms a flow path for molten resin between the die 200 and the core 300, a die recess 230 that is provided in the die 200 and opens toward the downstream side in the flow direction of the molten resin and accommodates a plurality of separators 400 that are slidable in the axial direction and form part of the inner wall of the die recess 230 and are positioned on the core 300 side with respect to the separators 400 to allow the molten resin to flow from the die 200, and a die recess 230 that is disposed on the core 300 side and allows the molten resin to flow from the die 200 to the core 300. The molding device 100 includes a wall portion 240 extending so that its thickness gradually decreases toward the downstream side in the resin flow direction, and a separator recess 440 formed on the surface of the separator 400 opposite the core 300 side and having a shape that expands radially outward or follows the radial direction, and the molding device 100 includes a rod 120 that slides the separator 400 in the axial direction, and a slide mechanism 110 that includes an actuator 130, and the wall portion 240 is elastically deflectable radially outward when pressed by molten resin flowing through the flow path.

[0003] In Patent Document 1, a wall portion 240 that is formed in the die 200 and forms a part of the inner wall of the die recess 230 is located on the core 300 side with respect to the separator 400, and therefore movement of the separator 400 toward the core side is restricted by the wall portion 240. This wall portion 240 extends from the die 200 toward the downstream side so that its thickness gradually decreases, and furthermore, is elastically deflectable radially outward when pressed by the molten resin flowing through the flow path, so that when the wall portion 240 is deflected radially outward, it is pressed against the separator 400, and thus it is possible to suppress the generation of a gap between the wall portion 240 and the separator 400 and to suppress the outflow of the molten resin from this gap. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6927864 Summary of the Invention [Problem to be solved by the invention]

[0005] In the structure described in Patent Document 1, the molten resin still penetrates between the separators 400 arranged in a ring shape. As a result, as shown in Figures 8(a) and 8(b), the molten resin that penetrates between the separators 400 changes the gaps between the separators 400, causing the separators 400 to rotate in the axial or radial directions within the die recess 230 and interfere with the die recess 230. As a result, it becomes difficult to move the separator 400 in the axial direction within the die recess 230, and it becomes difficult to adjust the width of the flow path.

[0006] Furthermore, the molten resin that has entered between the separators 400 must be removed by disassembling the molding apparatus 100, and the disassembly and removal process reduces the efficiency of the molding process. The present invention aims to reduce the contact area with the die recess or adjacent separators, etc., thereby smoothing movement during contact, and to prevent the separator from rotating axially or radially within the die recess even if molten resin gets between the separators or between the separator and the wall, making it possible to adjust the width of the flow path by moving the separator axially within the die recess, and also to improve the efficiency of the molding process by reducing the frequency of disassembly of the molding apparatus to remove molten resin. [Means for solving the problem]

[0007] In order to solve the above problem, the present invention of claim 1 provides a molding apparatus including a cylindrical die and a core arranged inside the die, movable in the axial direction of the die, and forming a flow path for molten resin between the die and the core, wherein the separator is accommodated in a die recess formed in a ring shape radially of the die and opening at one end side in the axial direction of the die, and is attached in multiple numbers so as to be movable in the axial direction of the die, the separator having an inner circumferential surface located on the core side, an outer circumferential surface located opposite the core side, and two separator side surfaces connecting the inner circumferential surface and the outer circumferential surface, and at least one of the separator side surfaces has a separator side surface recess formed therein that is recessed from the surface of the separator side surface.

[0008] In the present invention of claim 1, the separator has an inner peripheral surface located on the core side, an outer peripheral surface located on the opposite side to the core side, and two separator side surfaces connecting the inner peripheral surface and the outer peripheral surface, and at least one of the separator side surfaces has a separator side surface recess formed therein recessed from the surface of the separator side surface, so that when the separator contacts the separator side surface of an adjacent separator, the contact area can be reduced. Also, when molten resin enters between the separators, the molten resin enters the separator side surface recess, thereby maintaining the gap between the separators.

[0009] As a result, the separator is prevented from rotating in the axial or radial direction within the die recess, and interference with the die recess and between the separators is prevented, so the separator can be moved smoothly in the axial direction of the die, and the width of the flow path can be adjusted with precision. In addition, the frequency of disassembly of the molding device for removing molten resin can be reduced, making the molding process more efficient.

[0010] The present invention of claim 2 is the invention of claim 1, wherein the separator inner surface has a separator inclined surface exposed from the die and facing the core expansion portion of the core, and the separator side recess has a separator side recess extension portion formed in a portion of the separator side recess corresponding to the separator inclined surface, the separator side recess extension portion being connected to the separator side recess and expanding toward the separator inner surface, and the separator side recess extension portion is a separator composed of a plurality of convex portions protruding toward the separator inner surface.

[0011] In the present invention of claim 2, a separator inclined surface is formed on the inner surface of the separator, which is exposed from the die and faces the core expansion portion of the core, and a separator side recess extension portion is formed in the portion of the separator side recess corresponding to the separator inclined surface, which is connected to the separator side recess and expands toward the separator inner surface, and the separator side recess extension portion is composed of a plurality of convex portions protruding toward the separator inner surface. Therefore, molten resin that enters between the separators exposed from the die can be guided by the separator side recess extension portion, i.e., from the plurality of convex portions, into the separator side recess. Even if the molten resin enters between the separators, the gap between the separators can be maintained by the molten resin entering the separator side recess.

[0012] As a result, the separator is prevented from rotating in the axial or radial direction within the die recess, and interference with the die recess and between the separators is further reduced, allowing the separator to move smoothly in the axial direction of the die and the width of the flow path to be adjusted with precision. Also, the frequency of disassembly of the molding device for removing molten resin can be reduced, improving the efficiency of the molding process.

[0013] The present invention of claim 3 relates to a molding apparatus including a cylindrical die and a core arranged inside the die, movable in the axial direction of the die, and forming a flow path for molten resin between the die and the core, the separator being accommodated in a die recess formed in a ring shape in the radial direction of the die and opening to one end side in the axial direction of the die, and being arranged in a plurality of positions so as to be movable in the axial direction of the die, the outer peripheral surface of the die recess located opposite the core side being provided with a guide rail for guiding the movement of the separator in the axial direction of the die, the separator end recess abutting against the guide rail is formed at both ends of the outer peripheral surface of the separator located opposite the core side of the separator, and the separator end recess has a groove formed therein approximately parallel to the axial direction of the die.

[0014] In the present invention of claim 3, the outer peripheral surface of the die recess located on the opposite side to the core side of the die recess is provided with a guide rail for guiding the movement of the separator in the axial direction of the die, and the separator end recesses that abut against the guide rails are formed at both ends of the outer peripheral surface of the separator located on the opposite side to the core side of the separator, so that even if the molten resin enters between the separators, or even if the molten resin enters between the die recess and the separator, the separator can slide in the axial direction of the die by the guide rail. As a result, the separator is prevented from rotating in the axial or radial direction in the die recess and interference with the die recess can be prevented, so that the separator can be moved in the axial direction of the die and the width of the flow path can be adjusted. In addition, the frequency of disassembly of the molding device for removing the molten resin can be reduced, so that the efficiency of the molding process can be improved.

[0015] In addition, the separator end recess has a groove formed in a direction substantially parallel to the axial direction of the die, which reduces the contact area between the separator end recess and the guide rail, allowing the separator to move smoothly in the axial direction of the die.

[0016] The present invention of claim 4 relates to a molding apparatus including a cylindrical die and a core arranged inside the die, movable in the axial direction of the die, and forming a flow path for molten resin between the die and the core, the separator being accommodated in a die recess formed in a ring shape in the radial direction of the die and opening to one end side in the axial direction of the die, and being arranged in a plurality of portions so as to be movable in the axial direction of the die, the separator having a separator inner circumferential surface located on the core side, a separator outer circumferential surface located opposite the core side, and two separator side surfaces connecting the separator inner circumferential surface and the separator outer circumferential surface, and a separator outer circumferential surface protrusion protruding from the separator outer circumferential surface is formed at or near the tip portion of the separator outer circumferential surface on the axial downstream side of the die.

[0017] In the present invention as set forth in claim 4, a separator outer peripheral surface protrusion protruding from the separator outer peripheral surface is formed at or near the tip portion of the separator outer peripheral surface downstream in the axial direction of the die. Therefore, when the separator outer peripheral surface contacts the die recess outer peripheral surface located on the opposite side of the core side of the die recess, only the separator outer peripheral surface protrusion comes into contact, so that the contact area between the die recess outer peripheral surface and the die recess outer peripheral surface on the die recess outer peripheral surface side can be reduced. As a result, the separator can be moved smoothly in the axial direction of the die. Furthermore, even if a foreign object gets between the separator outer peripheral surface and the die recess outer peripheral surface, the separator can be moved smoothly in the axial direction of the die.

[0018] In addition, since the separator outer peripheral surface protrusion is formed at or near the tip portion of the separator outer peripheral surface on the axial downstream side of the die, when molten resin enters between the separators and wraps around the separator outer peripheral surface and falls downward, the falling molten resin is received by the separator outer peripheral surface protrusion, preventing it from falling downward from the separator and adhering to the parison after molding. Effect of the Invention

[0019] In a molding apparatus including a cylindrical die and a core disposed inside the die, movable in the axial direction of the die, and forming a flow path for molten resin between the die and the core, a plurality of separators are mounted in die recesses formed in a ring shape in the radial direction of the die and opening at one end side in the axial direction of the die, and are movable in the axial direction of the die, the separators have an inner peripheral surface located on the core side, an outer peripheral surface located opposite to the core side, and two separator side surfaces connecting the inner peripheral surface and the outer peripheral surface, and a separator side surface recess is formed on at least one of the separator side surfaces, so that even if the molten resin enters between the separators, the molten resin enters the separator side surface recess, thereby maintaining the gap between the separators. Also, even if the separator side surfaces of adjacent separators come into contact with each other, the contact area can be reduced.

[0020] As a result, the separator is prevented from rotating in the axial or radial direction within the die recess, and interference with the die recess and between the separators is prevented, so the separator can be moved smoothly in the axial direction of the die, and the width of the flow path can be adjusted with precision. In addition, the frequency of disassembly of the molding device for removing molten resin can be reduced, making the molding process more efficient. [Brief description of the drawings]

[0021] [Figure 1] FIG. 1 is a plan view for illustrating a molding device according to an embodiment of the present invention. [Diagram 2] FIG. 2 is an enlarged view of area A in FIG. [Diagram 3] XX cross-sectional view of FIG. [Figure 4] 1A and 1B are perspective views of a separator according to an embodiment of the present invention used in a molding device, where FIG. 1A is a view from the inner peripheral surface side of the separator, and FIG. 1B is a view from the outer peripheral surface side of the separator. [Diagram 5] FIG. 4(b) is a side view of FIG. [Figure 6]FIG. 2 is a perspective view of a guide rail used in a molding device according to an embodiment of the present invention. [Figure 7] FIG. 1 is a cross-sectional view of a conventional molding device (Patent Document 1). [Figure 8] 5A and 5B are diagrams for explaining changes in the gaps between separators due to molten resin that has entered between the separators, where (a) is a cross-sectional view and (b) is a plan view. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] A molding apparatus according to an embodiment of the present invention will be described with reference to Figs. 1 to 6. Fig. 1 is a plan view for explaining the molding apparatus in a schematic manner, and Fig. 2 is an enlarged view of region A in Fig. 1. Fig. 3 is a cross-sectional view taken along line XX in Fig. 1, showing a cross-section on the right side. Fig. 2 is also a cross-sectional view taken along line YY in Fig. 3. As shown in Figs. 1 and 3, the molding apparatus 1 has a cylindrical die 20 and a core 30 disposed inside the die 20. The core 30 is substantially columnar or cylindrical, and is disposed so as to have the same axis Z as the die 20, that is, coaxially.

[0023] The molding apparatus 1 is disposed so that one end side in the axial direction of the die 20 and the core 30 is on the upper side and the other end side is on the lower side. That is, it is disposed so that the axis Z is vertical. However, the orientation of the molding apparatus 1 during use is not limited to this, and for example, it may be disposed so that the axis Z is horizontal.

[0024] Hereinafter, the direction extending along the axis Z of the die 20 and the core 30 will be referred to as the "axial direction." Also, the radial direction of the die 20 and the core 30 will be referred to as the "radial direction." Also, in the drawings, the upper side of the molding apparatus 1, i.e., the upstream direction, is indicated by an arrow UP, the lower side, i.e., the downstream direction, is indicated by an arrow DW, and the radially outward direction is indicated by an arrow KS.

[0025] A flow path 2 for the molten resin is formed between an inner peripheral surface 21 of the die 20 and an outer peripheral surface 31 of the core 30. The molten resin is made to flow through the flow path 2 from one end side to the other end side of the molding device 1, that is, from the upper side to the lower side in Fig. 3, and is molded into a parison P having a predetermined shape.

[0026] In the molding device 1, the core 30 can be moved axially upward or downward relative to the die 20 by a moving mechanism (not shown). A core enlarged diameter portion 32 is formed on the lower end side of the outer circumferential surface 31 of the core 30, where the diameter of the core 30 gradually increases toward the end side. Between this core enlarged diameter portion 32 and a die enlarged diameter portion 22 (described later) or an opposing surface 41 of a separator 40, the width of the flow path 2 changes toward the end side due to the axial movement of the core 30.

[0027] A die recess 23 that is open to the lower end side is formed in the die 20. As shown in Figures 1 and 2, the die recess 23 has an annular shape that is continuous in the radial direction of the die 20.

[0028] A plurality of separators 40 are housed in the die recess 23. As shown in Figs. 1 and 2, the separators 40 are arranged in a line in the radial direction of the die 20. In this embodiment, the number of separators 40 is 20. However, the number of separators 40 is not limited to 20. Each separator 40 has an arc shape when viewed in the axial direction. The plurality of separators 40 as a whole surround the core 30 in an annular shape.

[0029] As shown in Fig. 3, the die 20 is formed with a wall portion 24 located on the core 30 side with respect to the separator 40. The wall portion 24 extends from one end side to the other end side (from above to below) in the die recess 23, and forms a part of the inner circumferential surface 21 of the die 20. In Fig. 3, the wall portion 24 has a tip portion that is the die expanded diameter portion 22, and is formed in a tapered shape in the downward direction.

[0030] The height of the separator 40 is determined so that a portion of the separator 40 protrudes below the wall portion 24 toward the lower end side to form an opposing surface 41 opposing the core 30. FIG. 4 is a perspective view of a separator 40 used in the molding apparatus 1, where (a) is a view seen from the inner peripheral surface side of the separator, and (b) is a view seen from the outer peripheral surface side of the separator.

[0031] Separator 40 has a separator inner surface 42 located on the core 30 side, a separator outer surface 45 located on the opposite side to the core 30 side, and two separator side surfaces 48 (first side surface 481, second side surface 482) connecting separator inner surface 42 and separator outer surface 45.

[0032] 3 and 4(a), the separator inner peripheral surface 42 of the separator 40 is formed with a die contact surface 43 that contacts the wall portion 24 of the die 20, and a separator inclined surface 44 that is connected to the die contact surface 43 and has a thinner radial thickness. The separator inclined surface 44 and a part of the die contact surface 43 form an opposing surface 41 (FIG. 3) that faces the core expanded diameter portion 32 of the core 30.

[0033] 4(b), a separator central recess 46 recessed radially inward (toward axis Z) is formed in the approximate center of the separator outer peripheral surface 45 of the separator 40. The inner side (portion close to axis Z) of the separator central recess 46 is a curved surface that is curved into an approximately hemispherical shape. The separator central recess 46 abuts against the rod 11 of the slide mechanism 10, which will be described later.

[0034] 4(b), a separator outer peripheral surface protrusion 47 is formed at a tip portion of the separator outer peripheral surface 45 on the axial downstream side of the die 20, i.e., at a portion of the separator outer peripheral surface 45 facing the tip portion of the separator inclined surface 44 of the separator inner peripheral surface 42. A step is formed between the separator outer peripheral surface protrusion 47 and the separator outer peripheral surface 45, as shown in FIG.

[0035] 4(b), a separator end recess 49 is formed in a substantially rectangular parallelepiped shape at a corner of the separator 40, which is a connecting portion between the separator outer peripheral surface 45 and the separator side surface 48, except for the separator outer peripheral surface protrusion 47. A guide rail abutment surface 50 of the separator end recess 49 abuts against a separator guide portion 63 of a guide rail 60 attached to the die recess 23 described later.

[0036] Furthermore, three grooves 51 are formed on the guide rail abutment surface 50 of the separator end recess 49, which are recessed toward the separator inner peripheral surface 42 in parallel with the axial direction of the die 20. However, the number of grooves 51 is not limited to three.

[0037] Further, a guide rail clamping portion 55 is formed which protrudes from the separator outer peripheral surface 45 of the separator 40 along the separator outer peripheral surface 45 toward the separator end recess 49 side and clamps the guide rail 60 .

[0038] 4(b) and 5, a separator side surface recess 52 recessed from the surface of the separator side surface 48 is formed on a first side surface 481 of the separator side surface 48 of the separator 40. In this embodiment, the separator side surface recess 52 is not formed on a second side surface 482 of the separator side surface 48. Note that the separator side surface recess 52 may also be formed on the second side surface 482.

[0039] The separator side surface recess 52 is formed to have a shape that follows the outer shape of the separator side surface 48 and has a certain depth.

[0040] Furthermore, in the portion of separator side surface recess 52 corresponding to separator inclined surface 44, separator side surface recess extension 53 is formed which is connected to separator side surface recess 52 and expands toward separator inner circumferential surface 42. As shown in Fig. 5, separator side surface recess extension 53 is composed of four semicircular convex portions 54 which protrude toward separator inner circumferential surface 42. Note that convex portions 54 of separator side surface recess extension 53 do not have to be semicircular, and the number is not limited to four.

[0041] As shown in Fig. 3, in the core 30, the core expanded diameter portion 32 is also an opposing surface that faces the wall portion 24 and the separator inclined surface 44. This core expanded diameter portion 32 is a surface that is inclined radially outward toward the end side. By moving the core 30 in the axial direction, it is possible to change the flow path width between the core expanded diameter portion 32 and the separator inclined surface 44. In addition, by bringing the separator inclined surface 44 into contact with the core expanded diameter portion 32, it is also possible to cut the molten resin flowing through the flow path 2 at a desired position.

[0042] As shown in Fig. 3, the molding apparatus 1 has a plurality of slide mechanisms 10 each corresponding to a separator 40. The slide mechanisms 10 are mechanisms for sliding the separators 40 in the axial direction. The slide mechanisms 10 are composed of a rod 11 and a moving mechanism 12. The slide mechanisms 10 used are the same as those in Patent Document 1.

[0043] A support plate 13 is attached to the die 20, and a rod 11 is rotatably supported at its middle portion by a support shaft 14 formed on the support plate 13. The tip of the rod 11 is housed in contact with the separator central recess 46 without being connected to the separator 40 (unconnected state).

[0044] A moving mechanism 12 is attached to the outer periphery of the die 20 in one-to-one correspondence with the rod 11. The moving mechanism 12 includes an actuator 15 and a support shaft 14. The actuator 15 has a cylinder 16 from which a piston 17 extends. The piston 17 is connected to a rear end 18 of the rod 11. When the actuator 15 is driven, the tip of the rod 11 also moves axially in conjunction with the axial movement of the piston 17, and the separator 40 abutting against the tip of the rod 11 slides axially.

[0045] 2 and 3, a guide rail 60 is attached to the outer peripheral surface 25 of the die recess 23. The guide rail 60 abuts against the guide rail abutment surface 50 of the separator end recess 49, and guides the sliding of the separator 40 in the axial direction.

[0046] 6, the guide rail 60 has a separator guide portion 63 that abuts against the guide rail abutment surface 50 of the separator end recess 49 to guide the axial sliding of the separator 40, and an attachment portion 61 that is attached to the die recess 23. Also, attachment holes 62 are formed near the ends on both sides of the attachment portion 61. The die recess outer circumferential surface 25 (non-core side surface) of the die recess 23 facing the hole 62 is threaded, and the guide rail 60 is attached to the die recess outer circumferential surface 25 of the die recess 23 by bolts (not shown).

[0047] The separator guide portion 63 has a first guide portion 64 and a second guide portion 65 on the guide rail abutment surface 50 side of the separator end recesses 49 to accommodate two adjacent separators 40, and the angle formed by the first guide portion 64 and the second guide portion 65 is 162 degrees since there are 20 separators 40 in this embodiment. Also, the separator guide portion 63 has a side opposite to the guide rail abutment surface 50 side of the separator end recesses 49 thinned in the axial direction by hollowing out the part except for the mounting portion 61 including the portion where the hole 62 is formed.

[0048] As described above in detail, according to this embodiment, the following effects can be obtained. (1) Since the first side surface 481 of the separator side surface 48 of the separator 40 has the separator side surface recess 52 recessed from the surface of the separator side surface 48, the contact area can be reduced when the separator 40 comes into contact with the separator side surface 48 of an adjacent separator 40. Furthermore, when molten resin enters between the separators 40, the molten resin enters the separator side surface recess 52, thereby maintaining the gap between the separators 40.

[0049] (2) In the separator side surface recess 52, a separator side surface recess expansion 53 is formed in a portion corresponding to the separator inclined surface 44, which is connected to the separator side surface recess 52 and expands toward the separator inner circumferential surface 42, and the separator side surface recess expansion 53 is composed of four semicircular convex portions 54 protruding toward the separator inner circumferential surface 42, so that the molten resin entering between the separators 40 exposed from the die 20, particularly from the portion corresponding to the separator inclined surface 44, can be guided into the separator side surface recess 52 from the multiple convex portions 54 that are the separator side surface recess expansion 53. As a result, even if the molten resin enters between the separators 40, the gap between the separators 40 can be maintained by the molten resin entering the separator side surface recess 52.

[0050] (3) A guide rail 60 is attached to the outer peripheral surface 25 of the die recess 23, and a separator end recess 49 is formed in the corner, which is the connecting portion between the separator outer peripheral surface 45 of the separator 40 and the separator side surface 48, and is cut into an approximately rectangular parallelepiped shape except for the separator outer peripheral surface protrusion 47. The guide rail abutment surface 50 of the separator end recess 49 abuts against the separator guide portion 63 of the guide rail 60 attached to the die recess 23, which in particular prevents the separator 40 from rotating in the circumferential direction within the die recess 23.

[0051] (4) A groove 51 is formed on the guide rail abutment surface 50 of the separator end recess 49 parallel to the axial direction of the die 20, thereby reducing the contact area between the guide rail abutment surface 50 of the separator end recess 49 and the separator guide portion 63 of the guide rail 60.

[0052] (5) A separator outer peripheral surface protrusion 47 protruding from the separator outer peripheral surface 45 is formed at the tip portion of the separator outer peripheral surface 45 on the axial downstream side of the die 20, i.e., at the portion of the separator outer peripheral surface 45 that faces the tip portion of the separator inclined surface 44 of the separator inner peripheral surface 42. Therefore, when the separator 40 abuts against the die recess outer peripheral surface 25 located on the opposite side of the core 30 side of the die recess 23, only the separator outer peripheral surface protrusion 47 abuts against it, so that the contact area with the die recess outer peripheral surface 25 can be reduced. In addition, the separator outer peripheral surface protrusion 47 is formed at or near the tip portion of the separator outer peripheral surface 45 on the axial downstream side of the die 20. Therefore, when molten resin penetrates between the separators 40 and the molten resin that has wrapped around the separator outer peripheral surface 45 falls downward, the falling molten resin is received by the separator outer peripheral surface protrusion 47, preventing it from falling downward from the separator 40 and adhering to the parison after molding.

[0053] (6) And, by the above (1) to (5), it is possible to suppress the rotation of the separator 40 in the axial or radial direction within the die recess 23, and also to suppress interference between the separator 40 and the die recess 23 and between the separators 40, so that the separator 40 can be moved smoothly in the axial direction of the die 20, and the width of the flow path 2 can be adjusted with high precision. Also, it is possible to reduce the frequency of disassembly of the molding apparatus 1 for removing the molten resin, thereby improving the efficiency of the molding process.

[0054] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the object of the present invention.

[0055] In this embodiment, the separator side surface 48 of the separator 40 is formed with the separator side surface recess 52 and the separator side surface recess extension 53 connected to the separator side surface recess 52, but the separator side surface recess extension 53 does not necessarily have to be formed.

[0056] In this embodiment, the separator side surface recesses 52, the separator end recesses 49, and the separator outer peripheral surface protrusions 47 are formed simultaneously, but one or two of the above may be formed. [Explanation of symbols]

[0057] 1 Molding equipment 20 Die 23 Die recess 25 Die recess outer circumferential surface 30 cores 40 Separator 42 Inner surface of separator 43 Die contact surface 44 Separator inclined surface 45 Separator outer surface 47 Separator outer peripheral protrusion 48 Separator side 49 Separator end recess 50 Guide rail contact surface 51 Groove 52 Separator side recess 53 Separator side recess extension 54 Convex part 60 Guide Rail 63 Separator guide

Claims

1. In a molding apparatus including a cylindrical die and a core disposed inside the die and movable in an axial direction of the die, the core forming a flow path for molten resin between the die and the core, a separator is accommodated in a die recess formed in a ring shape in a radial direction of the die and opening at one end side in the axial direction of the die, the separator being attached in a plurality of pieces so as to be movable in the axial direction of the die, the separator has an inner peripheral surface located on the core side, an outer peripheral surface located on the opposite side to the core side, and two separator side surfaces connected to the inner peripheral surface and the outer peripheral surface, A separator, characterized in that at least one of the separator side surfaces has a separator side surface recess formed thereon, the recess being recessed from a surface of the separator side surface.

2. a separator inclined surface is formed on an inner peripheral surface of the separator, the separator inclined surface being exposed from the die and facing the core expansion portion of the core; a separator side recess extension portion is formed in a portion of the separator side recess corresponding to the separator inclined surface, the portion being connected to the separator side recess and extending in a direction toward an inner circumferential surface of the separator; The separator according to claim 1 , wherein the separator side recess extension portion is composed of a plurality of convex portions protruding toward the inner circumferential surface of the separator.

3. In a molding apparatus including a cylindrical die and a core disposed inside the die and movable in an axial direction of the die, the core forming a flow path for molten resin between the die and the core, a separator is accommodated in a die recess formed in a radial direction of the die, in an annular shape, and opening at one end side in the axial direction of the die, and the separator is divided into a plurality of separators movable in the axial direction of the die, a guide rail for guiding the movement of the separator in the axial direction of the die on an outer peripheral surface of the die recess located on the opposite side to the core side in the die recess, A separator characterized in that a separator end recess that abuts against the guide rail is formed at both ends of the separator outer surface located opposite the core side of the separator, and a groove portion is formed in the separator end recess approximately parallel to the axial direction of the die.

4. In a molding apparatus including a cylindrical die and a core disposed inside the die and movable in an axial direction of the die, the core forming a flow path for molten resin between the die and the core, a separator is accommodated in a die recess formed in a radial direction of the die, in an annular shape, and opening at one end side in the axial direction of the die, and the separator is divided into a plurality of separators movable in the axial direction of the die, the separator has an inner peripheral surface located on the core side, an outer peripheral surface located on the opposite side to the core side, and two separator side surfaces connected to the inner peripheral surface and the outer peripheral surface, A separator, characterized in that a separator outer peripheral surface protrusion protruding from the separator outer peripheral surface is formed at or near a tip portion of the separator outer peripheral surface on the axial downstream side of the die.

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