Injection molding mold and manufacturing device for resin molded article

Abstract

The injection molding mold is provided with a first mold and a second mold which is closed on the first mold. The first mold has a release assist mechanism including a slider portion that presses the second mold in the mold opening direction. The release assist mechanism is provided with: a drive unit that is driven by air pressure; and a toggle mechanism that converts the force of the drive unit into the movement of the slider unit in the mold opening direction.

Description

TECHNICAL FIELD

[0001] The present application relates to a mold for injection molding and a manufacturing apparatus of a resin molded product. BACKGROUND

[0002] In the past, a blow molding apparatus that performs injection molding on a preform made of resin and performs blow molding on the preform after the injection molding to manufacture a container has been known. In such a blow molding apparatus, an apparatus provided with a mechanism for easily performing mold opening of a mold has been proposed (for example, Patent Document 1).

[0003] PRIOR ART DOCUMENTS

[0004] PATENT DOCUMENTS

[0005] Patent Document 1: Japanese Patent Application Publication No. H7-35088 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] A mold for injection molding is clamped with a force of several hundred kN or more at the time of injection molding so as not to be opened due to the pressure of a resin material. Also, after the injection molding, the mold is sometimes engaged with each other at a sliding surface without being separated (fitted in a manner that cannot be separated) due to, for example, a slight deformation of a connecting rod, the mold, a lack of lubrication of a sliding surface, or the like, and the mold suddenly becomes unable to be opened.

[0008] In order to release the above-described engagement, a very large force needs to be applied to the mold, and an apparatus assembled with such a mold opening mechanism becomes a large-scale apparatus. In addition, at the time of replacing the mold, the mold opening mechanism or the like on the injection molding apparatus side becomes an obstacle, and the efficiency of the mold replacement work decreases, and there is room for improvement in this regard as well.

[0009] Therefore, the present application was completed in view of such a problem, and an object thereof is to provide a mold for injection molding that suppresses the generation of engagement of a mold at a mold opening and closing surface, and is compact and easy to perform a mold replacement work.

[0010] MEANS FOR SOLVING THE PROBLEMS

[0011] A mold for injection molding of one embodiment of the present application includes a first mold and a second mold that is closed to the first mold. The first mold has a disengagement assisting mechanism including a slider portion that presses the second mold in an opening direction. The disengagement assisting mechanism has a driving portion that is driven by air pressure and a toggle mechanism that converts a force of the driving portion to a movement in the opening direction of the slider portion.

[0012] EFFECTS OF THE INVENTION

[0013] According to one embodiment of the present application, a mold for injection molding can be provided that suppresses generation of a bite (inseparable fitting) of the mold at a mold opening and closing surface, and is compact and easy to perform mold replacement work. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a perspective view showing a structure example of a mold disengagement assisting mechanism of the present embodiment.

[0015] Figure 2 is a plan view of the disengagement assisting mechanism.

[0016] Figure 3 is a view showing a state before action of the disengagement assisting mechanism.

[0017] Figure 4 is a view showing a state after action of the disengagement assisting mechanism.

[0018] Figure 5 is a view showing a mold equipped with the disengagement assisting mechanism.

[0019] Figure 6 is a plan view of an injection cavity mold unit of Figure 5 .

[0020] Figure 7 is a plan view showing a structure example of a manufacturing apparatus of a resin-made container according to the present embodiment.

[0021] Figure 8 is a flowchart of an example of a manufacturing method of a resin-made container using the manufacturing apparatus. DETAILED DESCRIPTION

[0022] Hereinafter, an embodiment of the present application will be described with reference to the drawings.

[0023] In the embodiment, the configuration, elements other than the main part of the present application are simplified or omitted for easy understanding of the description. In the drawings, the same symbols are attached to the same elements. Note that the shape, size, and the like of each element shown in the drawings are schematically shown, and do not represent actual shape, size, and the like.

[0024] In the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z direction is set as the up-down direction (height direction) of Figure 3 , Figure 4 . The X direction is the left-right direction (width direction) of Figure 3 , Figure 4 , and is orthogonal to the Z direction. The Y direction is the paper surface perpendicular direction (depth direction) of Figure 3 , Figure 4 , and is orthogonal to both the Z direction and the X direction.

[0025] First, referring to Figures 1 to 4 An injection mold having a mold detachment assisting mechanism of the present embodiment will be described.

[0026] Figure 1 is a perspective view showing a structure example of the mold detachment assisting mechanism 1 of the present embodiment. Figure 2 is a plan view of the mold detachment assisting mechanism 1. Figure 3 is a view showing a state before the operation of the mold detachment assisting mechanism 1. Figure 4 is a view showing a state after the operation of the mold detachment assisting mechanism 1. Figure 5 、 Figure 6 is a view showing an example of a mold unit (injection mold) on which the mold detachment assisting mechanism 1 is mounted.

[0027] As shown in Figure 3 、 Figure 4 , the mold detachment assisting mechanism 1 of the mold is assembled to an injection mold 22, and is adapted to detach the mold that has been engaged (cannot be detached) after injection molding at the time of mold opening.

[0028] Among them, Figure 3 、 Figure 4 , the injection mold 22 is, for example, a mold adapted to injection molding of a bottomed cylindrical resin-made pre-mold (hereinafter, simply referred to as pre-mold), and includes an injection core mold 24, an injection cavity mold 26, and a neck mold 28. Note that the pre-mold is an example of a resin molded product.

[0029] The injection cavity mold 26 is an example of a first mold, and is a mold that defines the outer peripheral shape of the body portion and the bottom portion of the pre-mold. The injection core mold 24 is a mold that defines the shape of the inner peripheral side of the neck portion, the body portion, and the bottom portion of the pre-mold, and is inserted from the upper side with respect to the neck mold 28 and the injection cavity mold 26.

[0030] The neck mold 28 is an example of a second mold, and is a pair of split molds that define the outer peripheral shape of the neck portion of the pre-mold. The neck mold 28 is suspended and held to the lower surface of a neck plate 29. In addition, the neck mold 28 is held by a guide member 29a provided to the lower surface of the neck plate 29 so as to be openable and closable in the Y direction (depth direction). Note that the neck mold 28 also functions to hold the neck portion of the pre-mold after injection molding and to carry out the pre-mold from the injection cavity mold 26.

[0031] Returning to Figure 1 , the mold detachment assisting mechanism 1 of the mold has a mounting portion 2, a slider portion 3, a driving portion 4, a first link member 5 in a straight line, and a second link member 6 in a substantially triangular flat plate shape. One end of the first link member 5 and a first end portion of the second link member 6 are connected to each other by a hinge portion 7. Figure 3 、Figure 4 The left end portion of the first link member 5 is rotatably connected by a pin 10 inserted in the Y direction. Also, with respect to the first link member 5 and the second link member 6, the position in the Y direction is restricted, and on the other hand, movement in the XZ plane is possible.

[0032] The entire shape of the mounting portion 2 is formed in an L shape, and the mounting portion 2 has a base portion 2a on the bottom surface side, and an extension portion 2b which stands up in the height direction (Z direction) with respect to the base portion 2a. The base portion 2a of the mounting portion 2 is fixed to the injection cavity mold 26. Also, the base portion 2a has a support portion 2c which rotatably supports the other end of the first link member 5 by a pin inserted in the Y direction. The extension portion 2b is provided in order to secure a space in the height direction for housing the first link member 5 and the second link member 6, and on the upper side of the extension portion 2b, the slider portion 3 is arranged so as to be slidable in the height direction.

[0033] The slider portion 3 is a portion which performs a lifting action in the height direction of the injection cavity mold 26, and is slidable in the height direction with respect to the extension portion 2b. A pressing portion 3a is formed on the upper end side of the slider portion 3, and the pressing portion 3a abuts against the guide member 29a to push up the neck mold 28 by the guide member 29a. Also, a support portion 3b is provided on the lower side of the slider portion 3, and the support portion 3b is connected to the upper end portion of the second link member 6 by a pin inserted in the Y direction, and rotatably supports the upper end portion of the second link member 6.

[0034] The drive portion 4 has a cylinder 4a which drives a rod 4b by air pressure. A connecting portion 7 is provided on the front end portion of the rod 4b, and the connecting portion 7 is connected to the second link member 6. The connecting portion 7 is rotatably connected to the second end portion (right end portion) of the second link member 6 by a pin 11 inserted in the Y direction. Figure 3 、 Figure 4 The connecting portion 7 is rotatably connected to the second end portion (right end portion) of the second link member 6 by a pin 11 inserted in the Y direction.

[0035] Also, the cylinder 4a is mounted to a swing table which has a pair of support plates 8 and a seat 9 to which the rear end portion of the cylinder 4a is fixed. One side of the pair of support plates 8 of the swing table is fixed to the injection cavity mold 26 and extends in the X direction, and is arranged in opposition across the cylinder 4a. The seat 9 of the swing table is supported by a pin 8a on the other side of the pair of support plates 8, and is swingable with respect to the injection cavity mold 26 and the support plates 8 about the Y axis. The cylinder 4a is mounted to the injection cavity mold 26 so as to be swingable, and thus displacement between a state in which the rod 4b is extended and a state in which the rod 4b is housed can be absorbed by the swing table.

[0036] The first link member 5, the second link member 6, and the slider portion 3 constitute a toggle mechanism which moves the slider portion 3 with the drive portion 4 as input. As described above, the first link member 5 and the second link member 6 are connected by the pin 10 inserted in the Y direction, and the slider portion 3 is slidable in the height direction with respect to the extension portion 2b. Figure 3As shown, with the rod of the drive unit 4 housed (in the mold-closed position), the first link member 5 and the second link member 6 are arranged at an inclination relative to the extension 2b with a given opening angle θ.

[0037] If the lever 4b of the drive unit 4 is in the state of being received from the lever 4b of the drive unit 4 ( Figure 3 )like Figure 4 As it elongates, force P acts on the second link member 6 from the width direction (X direction). Consequently, the positional relationship between the first link member 5 and the second link member 6 shifts in a near-linear manner, and the opening angle θ between the first link member 5 and the second link member 6 approaches 180 degrees. At this time, the other end of the first link member 5 is supported by the support part 2c, thus its position remains constant. However, the larger the opening angle θ, the more the upper end of the second link member 6 moves upward in the height direction. As a result, the slider part 3 connected to the second link member 6 slides upward in the height direction (mold opening direction), and the pressing part 3a presses down on the guide member 29a.

[0038] Furthermore, in the toggle mechanism, if the opening angle θ of the first link member 5 and the second link member 6 is close to 180 degrees, the force F acting on the slider part 3 in the height direction (Z direction) increases rapidly relative to the force P input from the drive unit 4. Therefore, the slider part 3 can push the neck mold 28 upward with a force that is very large relative to the force P input from the drive unit 4.

[0039] It should be noted that the opening angle θ of the first connecting rod member 5 and the second connecting rod member 6 at the mold-closed position is preferably 120 degrees or more. By increasing the opening angle θ at the mold-closed position, the amplification effect of the force P from the cylinder 4a in the toggle mechanism becomes greater, and the force F acting on the slider part 3 in the mold-opening direction also becomes greater.

[0040] As described above, in the injection molding mold 22 of this embodiment, a release assist mechanism 1 is assembled in the injection cavity mold 26 that receives the neck mold 28. The release assist mechanism 1 converts the force of the drive unit 4, which is driven by air pressure, into the movement of the slider unit 3 in the mold opening direction via a toggle mechanism. As a result, the release assist mechanism 1 can use a relatively small force from the cylinder 4a as input to generate a larger force in the mold opening direction in the slider unit 3, and can release the engagement between the injection cavity mold 26 and the neck mold 28 by pressing the slider unit 3.

[0041] Furthermore, in this embodiment, the auxiliary mechanism 1 is assembled onto the injection molding mold 22, thereby eliminating the need for a hydraulic cylinder for mold opening on the injection molding apparatus side and enabling a more compact structure for the injection molding apparatus. Additionally, when changing the injection molding mold 22, there is no need for cumbersome operations such as removing and reinstalling the hydraulic cylinder for mold opening, thus simplifying mold changing operations for the operator.

[0042] In addition, the detachment assisting mechanism 1 of the present embodiment operates by air pressure, and thus does not generate oil mist or oil leakage as in the case of a hydraulic type. Therefore, the connecting work at the time of mold exchange is also relatively easy, and in this respect, the burden on the worker during the mold exchange work can also be reduced. In addition, the detachment assisting mechanism 1 does not generate oil mist or oil leakage as described above, and thus is also suitable for use in a clean environment such as a clean room, for example.

[0043] Figure 5 、 Figure 6 is a detailed view of a mold unit 1A (injection mold 22) to which the detachment assisting mechanism 1 is attached. The mold unit 1A is an injection mold for molding a preform for a container, and has at least an injection core mold unit 24A, an injection cavity mold unit 26A, and a neck mold unit 28A.

[0044] The injection core mold unit 24A has at least a plurality of injection core molds 24, a first core mold fixing plate 24a, a second core mold fixing plate 24b, and a guide rod 24c. The first core mold fixing plate 24a has a recess capable of supporting the plurality of injection core molds 24 in a columnar shape. The second core mold fixing plate 24b plugs the upper surface of the first core mold fixing plate 24a, and integrates the injection core molds 24 and the first core mold fixing plate 24a. The guide rod 24c protrudes downward from both sides of the lower surface of the first core mold fixing plate 24a, penetrates a guide hole (described later) of the neck mold unit 28A, and is fitted into a guide groove (described later) of the injection cavity mold.

[0045] In addition, the first core mold fixing plate 24a has a second guide member 24d protruding downward from both sides of the lower surface thereof, and the second guide member 24d has a guide function of opening and closing the neck mold 28 in the horizontal direction in conjunction with the lowering of the neck mold 28 (neck mold holding plate described later). In addition, the injection core mold unit 24A has a through hole 24e that accommodates a mechanical-side lifting pin (not shown) that lifts the neck mold unit 28A. Furthermore, the injection core mold unit 24A has a cooling circuit inside the injection core mold 24 for flowing a refrigerant.

[0046] The neck mold unit 28A has at least a plurality of neck molds 28 including a pair of neck cavity molds (neck split molds) 28a, a neck mold holding plate 28b, and a neck plate (neck mold fixing plate) 29.

[0047] The neck mold holding plate 28b is formed of a pair of plate-like members that hold a plurality of neck molds 28 in a row. The neck plate 29 has a first guide member (guide member) 29a in an L-shaped cross section at positions on both sides thereof, a first recess 29b on an upper surface for insertion of a lift rod on the machine side, and a second recess 29c on a side surface for insertion of a connecting member with the lift rod. The neck plate 29 supports a plurality of one or more neck mold holding plates 28b via the guide members 29a so as to be openable and closable.

[0048] The neck mold holding plate 28b has a slit 28c on both sides thereof for entry of the second guide member 24d described above. The neck mold holding plate 28b has, on a front surface thereof (a surface of the plate-like member 28b in the opening and closing direction), a through-hole 28d, a rod member inserted through the through-hole, and a return spring provided at both ends of the rod member and returning the plate-like member 28b in the open state to the closed state. In addition, the neck mold holding plate 28b has a cooling circuit for flowing of a refrigerant, and cooling of the neck mold 28 is possible.

[0049] The injection cavity mold unit 26A has at least a plurality of cavity mold inserts (injection cavity molds) 26, a block member 26a, a fixing plate 26b, and the disengagement assisting mechanism 1 described above.

[0050] The block member 26a is provided with a recess (or a through-hole) that accommodates the cavity mold inserts 26. The fixing plate 26b fixes the cavity mold inserts 26 to the block member 26a. In addition, the injection cavity mold unit 26A (or the block member 26a) has a guide groove 26c that engages with the guide rod 24c on both sides thereof.

[0051] The disengagement assisting mechanism 1 is provided on both sides of the block member 26a. Although not particularly limited, the disengagement assisting mechanism 1 can be provided on one side surface (width direction side surface) of the block member 26a in two or more, and on both sides in four or more.

[0052] In addition, the injection cavity mold unit 26A (or the block member 26a) has a cooling circuit that causes a refrigerant to flow around the plurality of cavity mold inserts (injection cavities) 26 to cool the mold. Furthermore, a hot runner mold (HR) that guides molten resin from an injection device to the cavity mold inserts 26 can be provided below the block member 26a.

[0053] The injection core mold unit 24A, the neck mold unit 28A, and the injection cavity mold unit 26A are integrated by a plurality of linking tools when carried in and carried out to the machine side. At the time of molding (or at the time of injection mold opening operation), the injection core mold unit 24A and the neck mold unit 28A are maintained in an integrated state by the lift rod on the machine side and the second guide member 24d, but the injection cavity mold unit 26A is separated from the injection core mold unit 24A and the neck mold unit 28A by the mold opening and closing mechanism on the machine side and the disengagement assisting mechanism 1.

[0054] Next, a description will be given of the resin container manufacturing apparatus 100 according to the present embodiment with reference to Figure 7 , Figure 8 to which the present embodiment pertains.

[0055] Figure 7 A structure example of a blow molding apparatus of a 1.5-stage method, which has advantages of both the hot parison method and the cold parison method, is shown as the resin container manufacturing apparatus 100 to which the present embodiment pertains. In the blow molding method of the 1.5-stage method, a pre-molded parison, which retains heat at the time of injection molding, is blow molded to manufacture a container substantially similarly to the hot parison method (1-stage method). However, the cycle of blow molding in the 1.5-stage method is set to be shorter than the cycle of injection molding of the pre-molded parison. Also, a plurality of pre-molded parisons molded in one cycle of injection molding are divided into a plurality of cycles (for example, three times) of blow molding and are blow molded.

[0056] As shown in Figure 7 , the blow molding apparatus 100 includes an injection molding section 110 that injection molds a pre-molded parison, a cooling section 120 that cools the pre-molded parison, a heating section 130 that heats the pre-molded parison after cooling, and a blow molding section 140 that blow molds the pre-molded parison after heating. In addition, the blow molding apparatus 100 includes a continuous conveying section 150 that conveys the pre-molded parison, which is carried out from the cooling section 120, to the blow molding section 140 via the heating section 130.

[0057] Figure 7 The injection molding section 110 shown in Figure 5 , Figure 6 has a mold unit 1A. In the molding space of the mold unit 1A in a closed mold state, a resin material is introduced from an injection device (not shown) via a hot runner mold HR, and injection molding of a pre-molded parison is performed. In addition, when the mold unit 1A is opened, a detachment assisting mechanism 1 provided to the injection cavity mold unit 26A is driven, and the neck mold unit 28A is pushed up. Thus, the engagement of the injection cavity mold 26 and the neck mold 28 is released, so that the mold can be detached well.

[0058] The pre-molded parison injection molded by the injection molding section 110 is supplied from the injection molding section 110 to the cooling section 120. The cooling section 120 forcibly cools the pre-molded parison molded by the injection molding section 110. The pre-molded parison is carried out from the cooling section 120 in a state of being cooled to a given temperature and is continuously conveyed along a conveying line of the continuous conveying section 150. In addition, the pre-molded parison conveyed by the continuous conveying section 150 passes through the heating section 130 and is heated to a stretch appropriate temperature by the heating section 130.

[0059] The preform heated by the heating section 130 is handed over from the continuous conveying section 150 to the intermittent conveying section 160, and is conveyed to the blow molding section 140 at a given interval. The blow molding section 140 performs stretch blow molding of a given number of preforms to manufacture containers. The containers manufactured by the blow molding section 140 are conveyed to the take-out position P outside the blow molding section 140 by the intermittent conveying section 160 and are taken out to the outside of the apparatus.

[0060] Figure 8 is a flowchart of an example of a manufacturing method of a resin-made container using the manufacturing apparatus 100.

[0061] First, in the injection molding section 110, a resin material is injected into the mold unit 1A after the mold is closed, and a preform is injection molded (step S1: injection molding process). Next, the mold unit 1A is opened. At the time of opening, the detachment assisting mechanism 1 provided to the injection cavity mold unit 26A is driven, and the neck mold unit 28A is pushed up. Thus, the engagement of the injection cavity mold 26 and the neck mold 28 is released, so that the mold can be detached well.

[0062] Next, the preform is carried out from the mold unit 1A by a conveyance apparatus not shown. During this conveyance, the preform is cooled in the cooling section 120, and is inverted from an upright state with the neck portion upward to an inverted state with the neck portion downward in the cooling time (step S2: cooling process).

[0063] The preform in the inverted state is handed over to the conveying tool of the continuous conveying section 150 provided with a plurality of rows below the cooling section 120. The conveying tool holding the preform is conveyed in order along the conveying line and passes through the heating section 130. In the heating section 130, the preform in the inverted state continuously conveyed by the continuous conveying section 150 is heated uniformly as a whole while being rotated (step S3: heating process).

[0064] The preform heated by the heating section 130 is handed over to the intermittent conveying section 160 located on the downstream side of the heating section 130. At this time, the preform is inverted to the upright state by an inverting apparatus not shown. The intermittent conveying section 160 grips the neck portion of each preform in the upright state and conveys it to the blow molding section 140. In the blow molding section 140, the preform is biaxially stretched and shaped into a container by a blow mold (step S4: blow molding process). Thereafter, the container manufactured by the blow molding section 140 is carried out to the take-out position P outside the blow molding section 140 by the intermittent conveying section 160. Thus, the explanation of Figure 8 is ended.

[0065] As described above, the manufacturing apparatus 100 of the present embodiment blow-molds a preform having retained heat at the time of injection molding, whereby a resin container can be efficiently manufactured. In addition, in the manufacturing apparatus 100 of the present embodiment, the stop of the apparatus due to the engagement of the mold is suppressed by applying the detachment assisting mechanism 1 to the mold unit 1A (injection mold 22), whereby the manufacturing efficiency of the resin container is further improved.

[0066] The present application is not limited to the above-described embodiments, and various modifications and design changes can be made within the scope of the present application.

[0067] The detachment assisting mechanism 1 and the injection mold 22 of the present embodiment are not limited to being applied to the manufacturing apparatus 100 described in the above-described embodiments. For example, the detachment assisting mechanism 1 and the injection mold 22 of the present embodiment can be applied to a blow-molding apparatus of other structures such as a one-stage type in which a preform is moved by a transfer plate moving in a rotation direction, an injection-molding apparatus of a preform that does not have a blow-molding section, and the like.

[0068] In addition, the blow-molding apparatus (manufacturing apparatus 100) of the 1.5-stage type can be, for example, a structure in which an injection-molding process and a part of a temperature adjustment process are performed in parallel in two paths with a time difference set therebetween.

[0069] In addition, the position and the number of the injection mold 22 to which the detachment assisting mechanism 1 is attached are not limited to those of the above-described embodiments, and can be appropriately changed.

[0070] Furthermore, the embodiments disclosed this time achieve their objects also by providing the following configurations. (1) A blow-molding apparatus including: a mold unit having a blow-molding section and an injection-molding section; and a detachment assisting mechanism configured to detach a preform from the blow-molding section.

[0071] Symbol Explanation

[0072] 1: Detachment assisting mechanism; 2: Mounting portion; 3: Slider portion; 3a: Pressing surface; 4: Driving portion; 5: First link member; 6: Second link member; 20: Injection-molding section; 22: Injection mold; 24: Injection core; 26: Injection cavity; 28: Neck mold; 29: Neck plate; 29a: Guide member; 100: Manufacturing apparatus.

Claims

1. An injection molding mold, comprising a first mold and a second mold that is closed within the first mold. The first mold includes a release assist mechanism, which has a slider portion for pressing the second mold in the mold opening direction. The disengagement auxiliary mechanism includes: a drive unit driven by air pressure; and a toggle mechanism that converts the force of the drive unit into movement of the slider unit in the mold opening direction.

2. The injection molding mold according to claim 1, wherein, The toggle mechanism has: The first link member, the other end of which is supported by a shaft; and The second link member is connected to one end of the first link member and the slider portion, and bears the force of the drive portion. When the slider is in the closed mold position, the opening angle between the first connecting rod member and the second connecting rod member is 120 degrees or more.

3. The injection molding mold according to claim 1, wherein, The first mold is an injection cavity mold that defines the shape of the body and bottom of a bottomed cylindrical preform. The second mold is a neck mold that defines the shape of the neck of the preform.

4. The injection molding mold according to claim 2, wherein, The injection molding mold further includes an injection core mold, which is inserted into the injection cavity mold and the neck mold, and defines the inner circumferential shape of the preform.

5. An apparatus for manufacturing resin molded articles, comprising an injection molding unit, wherein the injection molding unit uses an injection molding mold according to any one of claims 1 to 4 to injection mold the resin molded article. The injection molding unit activates the disengagement auxiliary mechanism when the first mold and the second mold are opened, thereby causing the second mold to disengage from the first mold.

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