WO2015199473A1 - Thermoplastic cast having excellent deformability and rigidity, and production method therefor - Google Patents

Abstract

The present invention relates to a reusable thermoplastic cast. The cast according to the present invention is characterized by comprising: a structure (10) having a net shape as a result of molding a polycaprolactone composite material into a net shape by means of injection molding or press-working; and an outer cover (20) attached/molded to the outer circumferential surface of the structure (10) by means of insert injection. The present invention improves breathability by forming a cast in a net shape and provides a thermoplastic cast which is structurally sturdy and appropriate for mass production by molding the cast by a mechanical means such as insert injection.

Description

Thermoplastic cast with excellent deformability and rigidity and its manufacturing method

The present invention relates to a thermoplastic cast having excellent deformability and rigidity and a method of manufacturing the same, and more particularly, to prevent a damaged part (affected area) from moving in the treatment process when a limb or a body part of a human or animal is fractured or damaged in orthopedic surgery. In addition, the present invention relates to a thermoplastic cast and a method of manufacturing the same, which can be easily treated because of excellent deformability when attached to the affected part.

In general, when a joint, limb or spine is broken or damaged, orthopedic surgery or the like can be used for casts, casts, sprinters, orthodontics (braces), etc. Or fix the spine.

Conventionally, in order to fix such damaged joints, limbs, or spine, casts are generally installed on the affected area using bandages and plasters, but such plasters are not only heavy, but also cannot be reshaped once solidified and exposed to moisture. In this case, it is difficult for the patient to bathe or shower because it is deteriorated or damaged, and in addition, air does not easily pass through the part where the cast is installed.

For the same reason, casts have been recently developed that are not damaged even when bathed or showered, and that air is easily distributed. As an example, a cast disclosed in US Patent No. 6,673,029 may be used. As shown in FIGS. 1A and 1B, the cast is made of a mesh shape having a relatively large size of the eye 120, in which the material forming the mesh shape has sufficient strength to firmly support and protect the body part. The resin-impregnated fiberglass fiber 110 is laminated in 6-12 layers to form a plate shape, and then the plate-shaped material is cut to form an hexagonal mesh array of eyes. , Reticular) is not only difficult to laminate the resin impregnated fiberglass fiber 110 in multiple layers, but also as described above When the impregnated fiberglass fiber 110 is laminated in several layers, the surface of the fiber layer is not smooth due to the unevenness of the impregnation during the resin impregnation process, so that the cast 100 made of such a smooth surface is worn. In this case, since the patient may feel uncomfortable, a separate layer must be formed again on the part in contact with the skin of the patient so that the surface can be smoothly formed.

In addition, even if a separate layer is formed on the surface in contact with the skin as described above, since the surface of the layer located therein is not smooth, the portion laminated thereon may not be smooth. Failure to do so beyond a certain thickness can still cause discomfort for the patient.

In addition, the patent is to make the cast 100 in the form of a reticular body, first made of fabric using the fiberglass fiber 110, and then cut the rhombus shape from the fabric to make the eye from the cut glass fiber fibers ( 110 may be loosened, and in this case, the strength of the cast 100 may be weakened, and when the resin is impregnated in the loosened all-parts, this part may become sharp and irritate the user's skin.

Moreover, since the cast 100 is manufactured by impregnating with a water-curable resin, contact with water or moisture should be prevented in the manufacturing process, and thus, when the cast is manufactured, productivity is low because the cast 100 should be made in a closed space from which moisture or moisture is removed. Since the contact with moisture must be blocked even after manufacture, the manufactured cast must be sealed and stored.Therefore, there is a problem in manufacturing management and cost, and once it is cured, it cannot be used again. Even if it is necessary to modify 100, there is a problem that it is difficult to modify and reuse the cast 100.

In order to solve the problems of the above water-curable cast, a cast made of a thermoplastic network has been developed, and one example thereof includes the thermoplastic cast disclosed in US Patent Application Publication No. 2008-0154164.

The cast disclosed in U.S. Patent Application Publication No. 2008-0154164 discloses a plurality of casts therebetween by forming the sprint member 210 of the cast 200 into a mesh having an approximately diamond-shaped opening, as shown in FIGS. 2A and 2B. Four rhombus-shaped passages 220 are formed, wherein the material of the sprint member 210 is a polycaprolactone composite material that can be formed at a low temperature so as to have sufficient strength to firmly support and protect a body part. A material in which additives such as lignocellulosic is mixed is used in the formed substrate, and the 'extension' in the longitudinal direction of the side is prevented from being excessively stretched by such a structure and the used material in a direction parallel to the directions of axis 1 and axis 3. The shape of the rhombus formed on the reticular body can be easily deformed according to the appearance of the body by allowing it to easily stretch (hereinafter, By the referred to as the "modified" to distinguish it from the 'height', which means that the variation in length increase.) Is a plan to ensure that the ease of the procedure.

However, the cast disclosed in the patent document is easy to deform, so that the procedure to the patient's body is relatively easy, but the entire cross section of the mesh-shaped sprint member 210 is formed by a polycaprolactone composite material to which lignocellulose is added. Therefore, the strength is relatively weak, and because of the softness of the material is not limited to the elongation in the longitudinal direction of the side is increased to some extent, in this case the thickness of the side is reduced, thereby weakening the strength of the cast In addition, there is a disadvantage that it is difficult to maintain the original form.

On the other hand, when using a cast made of such a material, first, an underlying padding or skin protector having a relatively small eye size is installed around the affected part to protect the skin of the patient. In the state where plasticity is maintained by heating a web-shaped cast having a relatively large eye size on the upper part of the pad, it is formed by surrounding the affected part and fixing it with a clip or the like. In the case where the lower pad is installed below the cast, If the ventilation is not smooth, and the lower pad gets wet due to the shower, the user may feel uncomfortable because moisture may remain on the lower pad for a long time.

In addition, when the lower pad is additionally installed in the lower part of the cast as described above, the lower pad may not be freely flown due to the contact between the upper cast and the lower pad, which may be uncomfortable. The lower pad should be replaced occasionally because it is shorter than the period. In this case, it is difficult and inconvenient to replace the lower pad by first melting the cast and then replacing the lower pad and forming the cast again.

Therefore, when the cast is applied to the patient's body part, the stretch in the longitudinal direction of the side can be limited, so that the strength of the cast can be maintained and the rhombus-shaped eye can be easily deformed according to the shape of the patient's body part. It is required to develop a cast of a structure that can be easily performed cast, and the patient does not feel uncomfortable when worn.

The present invention has been devised to solve the problems of the cast of the prior art made of a thermoplastic material as described above, having a sufficient strength and excellent deformability, and does not feel the user uncomfortable when worn, mass production It is an object of the present invention to provide a thermoplastic cast which is possible and excellent in deformation and rigidity and a method of manufacturing the same.

An object of the present invention to provide a thermoplastic cast excellent in deformation and rigidity as described above is a structure having a mesh shape by molding the thermoplastic cast into a net form by polycaprolactone composite material by injection molding or press working; It is achieved by constructing an outer shell attached and molded by insert injection into the outer peripheral surface of the structure.

Another object of the present invention to provide a thermoplastic cast manufacturing method excellent in deformability and rigidity is to have a net shape by molding a polycaprolactone composite material into a net shape by injection molding or press working. A structure forming step of forming a structure; A structure placing step of putting the structure formed by the structure forming step into the inside of the mold for manufacturing an outer shell; It is achieved by constructing a shell forming step of molding the shell on the outer circumferential surface of the structure by injecting a shell material of rubber material into the structure placed inside the mold for manufacturing the shell by the structure placing step.

In this case, the structure is molded by injection molding or press working, and the structure placing step includes installing the guide cap on the upper part of the mold for manufacturing the outer shell, and then lowering the pressure member while the structure is placed on the upper part of the guide cap. It is preferable that the procedure be carried out to be placed inside the manufacturing die.

In addition, in the skin forming step, one or more grooves having an inclined surface formed on a part of the lower surface of the structure is used, and the outer mold for forming the outer shell is formed in a shape corresponding to the groove on which the inclined surface is formed, Preferably, removable insert spacers are respectively provided.

In addition, the outer mold for forming the outer shell is preferably provided with movable support spacers in opposite directions to the movable insert spacer.

In addition, the skin forming step, the outer mold is provided with a movable support spacer is preferably configured to be molded to a certain thickness by placing the structure by the movable support spacer in the inner center of the outer mold manufacturing.

At this time, it is preferable that fiber-reinforced glass fibers, carbon fibers or polyethylene terephthalate fibers are added to the polycaprolactone composite constituting the structure.

In addition, it is preferable that polyethylene, polyurethane or polybutene is added to the polycaprolactone composite constituting the structure.

In addition, it is preferable that any nucleating agent of talc, sorbitol or sodium benzoate is added to the polycaprolactone composite constituting the structure.

In addition, it is preferable that grooves having a shape recessed inward are formed at portions where the structures cross each other.

The present invention is excellent in breathability because the cast is made of a mesh shape, and the low melting point thermoplastic polycaprolactone is made of a main material, so that it can be easily deformed when heated in hot water, etc. At the same time, the procedure is easy.

In addition, the cast of the present invention is light and thin compared to conventional casts made of polyurethane, etc., so that the patient can wear clothes thereon while wearing the cast.

In addition, in the present invention, since the outer skin of the cast surface is molded by insert injection, the surface of the cast is smooth, so that the patient does not feel uncomfortable even when contacting the skin of the cast, and the outer shell of the structure is molded by a mechanical method. This enables automation and mass production.

In the present invention, since the structure constituting the cast is made of a thermoplastic resin, a sealing facility for blocking moisture and the like is not required in manufacturing, and if necessary, it can be easily modified by reheating the cast and can be used repeatedly.

In addition, in the present invention, since the outer shell of the structure made of a polycaprolactone composite is surrounded by a rubber sheath, excessive elongation of the structure is limited when the structure is heated and at the same time, appropriate elasticity can be given to firmly support the body. .

In the present invention, since the structure is made of polycaprolactone composite material in which fiber-reinforced glass fiber, carbon fiber or polyethylene terephthalate fiber is added to polycaprolactone, it is excellent in flexural strength and impact strength and thus strengthens fracture sites. Can be supported.

In addition, in the present invention, since the outer surface of the cast is made of a hypoallergenic rubber outer shell, a shock absorbing effect can be expected, and in order to protect the skin, a skin protector or the like does not need to be pre-wound in the lower part of the cast.

In addition, the present invention is the outer peripheral surface of the structure by the injection insert and the support spacer in the state spaced apart from the mold for manufacturing the outer shell by filling the outer material of a certain thickness by injection molding, so that the cast for a long time Even though the skin is less damaged, the structure is not exposed to the outside of the skin.

1A and 1B show an example of a conventional cast,

2a and 2b show another example of a conventional cast,

3 is a cross-sectional view showing an example of a thermoplastic cast according to the present invention;

4 is a manufacturing flowchart showing the cast manufacturing method of the present invention in order;

5 is a configuration diagram showing an example of a mold for manufacturing a structure for molding a structure according to the present invention;

Figure 6 is a configuration diagram showing an example of the form of inserting the structure inside the mold for manufacturing the shell in order to mold the shell according to the invention,

7 is a configuration diagram showing an example of forming a shell on the outer peripheral surface of the structure according to the present invention,

8 is a configuration diagram showing an example of a movable support spacer of the outer mold for forming the outer shell for molding the present invention;

9 (a, b) is a cross-sectional view showing an example of the thermoplastic cast according to the present invention,

10 and 11 is a state diagram and a photograph showing an example of using the cast according to the present invention fixed by the fixing member.

<Description of the code>

1: cast 2: mold for structure construction

3: outer shell mold 2A: molding groove

2B: projection 3A: forming groove

3B: Guide cap 3C: Pressure member

3D: Spacer 3E: Removable Insert Spacer

3F, 3G, 3H, 3I, 3J: Removable Support Spacer

10: structure 11: groove

20: jacket F: holding member

Hereinafter, the configuration and operation of the present invention through the accompanying drawings showing a preferred embodiment in more detail.

The present invention relates to a cast used to wrap around, fix or correct a fracture site of a patient, and the cast according to the present invention includes a structure 10 and an outer circumferential surface of the structure 10 as shown in FIGS. 3 and 9. It consists of a sheath 20 surrounding the.

The structure 10 is made of a polycaprolactone composite based on polycaprolactone (PCL, polycaprolactone), the overall shape of which has a net shape in which regular openings are formed regularly, wherein the structure of the structure 10 Each side is shaped to have a rectangular cross-sectional shape whose height is relatively greater than the width, thereby ensuring sufficient rigidity against external forces or impacts.

And the structure 10 is made of a polycaprolactone composite as described above, the polycaprolactone composite is polycaprolactone, the main material, fiber reinforced glass fiber, carbon fiber or polyethylene terephthalate (polyethylene) terephthalate) fiber, and the reinforcement of the structure 10 is improved by this reinforcement, and as a result, the width of the structure 10 can be reduced, so that the proportion of the vents in the form of diamonds is increased, thereby improving the breathability of the cast. At the same time, the weight can be reduced.

Also, as an additive to the structure 10, polyethylene (PE, polyethylene), polyurethane (PU, polyurethane) or polybutene (PB, Polybutene) may be added, which lowers the material price of the structure 10, Since the solidification time can be adjusted, it is possible to secure enough time for the cast to the affected area.

The outer shell 20 may be molded on the outer circumferential surface of the structure 10, and the outer shell 20 is molded by insert injection as a rubber material.

 Since the main material of the structure 10 is a low melting point thermoplastic resin having a melting point of 60 to 70 ° C., and the melting point of the elastic rubber used for the shell is generally 100 ° C. or more, cast the cast in a temperature range of 70 to 100 ° C. using a water bath or the like. When heated, the structure is melted and deformable, and the outer shell is in an unmelted state, but since it is an elastic material, the cast made of the structure and the outer shell can be deformed, and the elasticity of the outer shell prevents overstretching when the cast is deformed. . Therefore, the change in the length of the eyes of the cast in the shape of the net shape is not large, and as a result, the thickness of the side is not thinned, so that the flexural strength impact strength of the cast is maintained as it is, and the procedure is performed to fit the affected area of the patient, and then cooled to cool the temperature. When lowered, the structure is solidified while crystallized to become a strong support, and the outer skin is elastic, which serves as a skin protector that is comfortably worn on the skin.

 The cast 1 of the present invention having the above structure is manufactured through the structure forming step S100, the structure placing step S200, and the shell forming step S300, as shown in FIG. The steps are explained.

(1) Structure forming step (S100)

This step is a step of forming a net-shaped structure by regularly forming a rhombus-shaped opening having a predetermined size by an injection process or a press operation, wherein the structure 10 is based on polycaprolactone as described above, The polycaprolactone base is mixed with reinforcing agents such as fiber-reinforced glass fiber, carbon fiber or polyethylene terephthalate fiber to further increase the strength. Also, polyethylene, poly Urethane or polybutene and the like are added.

In addition, a nucleating agent such as talc, sorbitol, or sodium benzoate may be added to the polycaprolactone composite constituting the structure 10, and the addition of such nucleating agent promotes crystallization of the polycaprolactone composite, and thus, As the solidification of the polycaprolactone composite is achieved, the injection molding time is shortened, the productivity is improved, and the excessive strength of the crystal of the polycaprolactone composite can be prevented, so that uniform strength can be expected.

And the structure 10 according to the present invention is molded to have a rectangular cross-sectional shape of a height larger than the width so that sufficient rigidity against external force or impact can be secured, wherein the width of the structure 10 is 4 ~ It is molded to a size of 5 mm and a height of 5.5 to 6.5 mm.

In addition, in the mold for manufacturing the structure 2 for forming the structure 10, the groove 11 for inserting the removable insert spacer 3E, which will be described later, is distributed in the bottom surface of the structure 10 as shown in FIG. As described above, one or more of the plurality of protrusions 2B are distributed and formed in the forming groove 2A for forming the structure 10. The structure and operation of the movable insertion spacer 3E will be described later.

On the other hand, when the cast is installed on the affected part of the patient, a part (for example, elbow) in which the cast is relatively largely deformed compared to other parts may be generated according to the part of the body where the cast is installed, in which case the structure 10 The parts intersecting with each other may not protrude flat, but may protrude upward or downward with respect to the plane, and when protruded downward, the protruding portions may press the skin of the patient, thereby causing the patient to feel uncomfortable. In order to prevent this, when forming the structure 10 to form a groove (not shown) of the shape that is embedded inwardly in the portion where the network-shaped structure 10 cross each other, or the structure 10 cross each other The thickness of the portion to be formed is relatively thinner than the surroundings, wherein the recessed shape of the groove is formed in the mold for manufacturing the structure (2) for forming the structure (10) It can be formed by forming a protruding portion (not shown), and the structure which makes the thickness of the intersection portion of the structure 10 relatively thin makes the thickness of the portion forming this portion relatively in the mold for manufacturing the structure 2. Achieved by thickening (not shown).

In the present invention, since the structure 10 is made by the injection process or the press work as described above, the thickness of the structure 10 can be molded uniformly and quickly, so that mass production is easy, and the surface of the structure 10 It becomes smooth.

(2) settling the structure (S200)

This step is a mold for manufacturing the shell 10 so that the shell 10 can be attached to the outer circumferential surface of the structure 10 formed by the structure molding step S100 by the skin forming step S300 described later. As a step of placing in the interior of the structure, as shown in Figure 6 for the purpose of having a guide portion (3B) is formed on the upper surface of the mold 3 for manufacturing the outer surface having a curved portion or inclined portion is formed in the form, It is provided with a pressing member (3C) for pushing the (10) toward the inside of the mold 3 for manufacturing the outer shell, by this configuration, the structure 10 is first placed on the upper portion of the guide cap (3B), and then the pressing member (3C) ) Is lowered to the outer mold 3, the structure 10 placed on the upper portion of the guide cap (3B) is lowered while sliding along the curved or inclined portion of the guide cap (3B) to the inside of the outer mold (3) Can be easily enshrined in, thereby As illustrated in FIG. 9A, the outer shell 20 may be uniformly attached to the outside of the structure 10, and mass production may be possible.

(3) skin forming step (S300)

This step is the step of forming the outer shell 20 on the outside of the structure 10, the surface is produced when the structure forming step (S100) of the smooth surface is produced, so the cast is formed only by the structure 10 Although the patient does not feel uncomfortable even in contact with the skin of the patient, the patient may be uncomfortable because the structure 10 becomes hard after the cast is installed in the affected part of the patient and cooled. By additionally molding the outer shell 20 of the rubber material on the outer circumferential surface of 10) to prevent the user from feeling more discomfort when wearing the cast, and also to prevent over-extension during the cast procedure.

When forming the shell 20 on the outer circumferential surface of the structure 10, the structure 10 and the shell in a state in which the structure 10 is inserted (inserted) into the inside of the mold 3 for manufacturing the shell through the structure placing step (S200). Molding by injecting a shell material of rubber material into the space between the manufacturing die 3, wherein the structure 10 is located in the inner center of the outer mold 3 for manufacturing the outer shell 20 when the shell 20 is molded ) Thickness becomes more than a certain thickness.

To this end, as described above, one or more grooves 11 having an inclined surface formed on a part of a lower surface thereof are distributed as described above, and the mold 3 for manufacturing the outer shell 20 for molding the shell 20 of this type is used. As shown in FIG. 7, a molding groove 3A on which the structure 10 is seated is formed, and the molding groove 3A has a shape corresponding to the groove 11 formed in a portion of the lower surface of the structure 10. A movable insert spacer 3E inserted into each of the one or more grooves 11 is provided, and a movable support spacer 3F formed in a direction opposite to the movable insert spacer 3E, respectively.

With the above structure, when molding the outer shell 20 as shown in FIG. 7, first, the structure 10 having the groove 11 having the inclined surface formed on a part of the lower surface is formed inside the mold 3 for outer shell manufacturing. After being settled, the movable insert spacer 3E and the movable support spacer 3F are simultaneously moved toward the structure 10 so that the structure 10 is enveloped by these movable insert spacers 3E and the movable support spacer 3F. The moving insert spacer 3E is guided by the inclined surface of the groove 11 formed in the lower portion of the structure 10 and drawn into the groove 11. Pressure injection process immediately after injection of each of the upper and lower movable insert spacers 3E and the movable support spacers 3F to the outside from the structure 10 while injecting the outer shell material into the space between the mold 3 for manufacturing the shell and the structure 10 in the state. Retreat during If this is kige by the envelope 20 over a certain thickness as shown in Figure 9 (a) is formed.

On the other hand, the upper and lower surfaces of the forming groove (3A) of the outer mold for manufacturing the outer mold 3 is provided with a movable insert spacer 3E and a movable support spacer 3F, respectively, and the structure 10 is formed by the groove 11 formed in the lower portion. While being described as being guided to be located in the center of the forming groove (3A), as shown in Figure 8, the outer side in the outer mold in the mold 3 for manufacturing the outer shell, respectively, movable support spacer (3G, 3H, 3I, and 3J, these movable support spacers can be implemented to support the outermost outer surface of the structure 10 so that the structure 10 is located in the center of the forming groove 3A, in which case First, the structure 10 is seated in the forming groove 3A of the outer mold 3, and then the movable support spacers 3G, 3H, 3I, 3J are projected toward the forming groove 3A. Each of the four sides of the The structure 10 is positioned at the center of the forming groove 3A by being guided by the expression support spacers 3G, 3H, 3I, and 3J, and then into the space between the mold 3 for skin preparation and the structure 10. When the movable support spacers 3G, 3H, 3I, and 3J are retracted simultaneously while injecting the outer shell material, the outer shell 20 having a predetermined thickness is formed on the outer circumferential surface of the structure 10 as shown in FIG.

As described above, the cast 1 of the present invention is molded such that the outer shell 20 of rubber material is formed to have a predetermined thickness or more, so that the outer shell 20 acts as a cushioning material, so that the cast 1 directly touches the skin of the patient. The compression of the pressure is reduced, and as a result, the occurrence of pain due to the compression of the cast is prevented, and there is no need to separately install a lower pad (skin protector) or the like on the lower part of the cast 1. In addition, the cast procedure prevents overextension of the cast.

When installing the cast (1) of the present invention having the structure described above to the affected part of the patient, first put the cast (1) at room temperature in a heater such as a microwave oven or a water bath and soften it by heating it softly so that it can be freely deformed. Next, after installing to cover the affected part of the fracture or correction, cast (1) in a state in which both ends of the cast (1) abutting each other using the fixing member (F) as shown in Figs. ) Is slowly cooled to room temperature to solidify, and then the installation of the cast 1 is completed by connecting both ends by a fixing clip.

At this time, the fixing member (F) used to fix both ends of the cast (1) can be used as long as the structure of any structure as long as it is fixed to both ends of the cast (1), including the clip or buckle form, the patient is cast ( It is preferable that the material is made of a plastic material instead of a metal material so that X-ray inspection can be performed even while wearing 1).

If it is necessary to remove or correct the cast 1 from the affected part of the patient, the cast member F is removed from the affected part by simply spreading both ends of the cast 1 after removing the fixing member F installed at both ends of the cast 1. 1) can be removed, the disassembly is relatively simple, and if the cast (1) is to be installed in the patient's affected area again, the disassembled cast (1) is heated again and softened, and then the cast (1) described above is installed. You can easily fix and reinstall it by going through the process again.

As described above, the present invention improves the air permeability by forming the cast into a net shape, and can also manufacture the cast easily and in large quantities by molding the structure made of the polycaprolactone composite and the outer shell of the rubber material by insert injection. Since the structure is made of thermoplastic material, it can be modified and reused by applying heat as needed.

Claims (13)

1. In the cast to wrap and fix the body, such as the fracture site of the patient,

   The cast includes a structure having a net shape by molding a polycaprolactone composite material into a net shape by injection molding or press working;

   Thermoplastic cast, characterized in that consisting of a shell (20) attached to the outer peripheral surface of the structure (10) by injection molding.
2. The method according to claim 1,

   The polycaprolactone composite constituting the structure 10 is a thermoplastic cast, characterized in that the fiber-reinforced glass fiber, carbon fiber or polyethylene terephthalate fiber is added.
3. The method according to claim 1,

   Polycaprolactone composite constituting the structure (10) is a thermoplastic cast, characterized in that polyethylene, polyurethane or polybutene is added.
4. The method according to claim 1,

   The polycaprolactone composite constituting the structure (10) is a thermoplastic cast, characterized in that the nucleating agent of any one of talc, sorbitol or sodium benzoate is added.
5. The method according to claim 1,

   Thermoplastic cast, characterized in that the groove (11) is formed in the shape where the structure (10) intersect each other.
6. In the manufacturing method of the cast to wrap and fix the body, such as the fracture site of the patient,

   The cast manufacturing method includes a structure forming step (S100) of forming a structure having a net shape by molding a polycaprolactone composite material into a net shape by injection molding or press working;

   A structure placing step (S200) for putting the structure (10) formed by the structure forming step (S100) into the inside of the mold (3) for manufacturing the shell;

    An outer shell for molding the outer shell 20 on the outer circumferential surface of the structure 10 by injecting a shell material made of a rubber material into the structure 10 placed inside the mold for manufacturing outer shell 3 by the step of placing the structure (S200). Method of producing a thermoplastic cast, characterized in that the forming step (S300).
7. The method according to claim 6,

   The structure 10 is molded by injection molding, and the structure placing step (S200) is to install a guide cap (3B) on the upper part of the mold for manufacturing the shell 3, and then the structure 10 to the guide cap And a step of lowering the pressing member (3C) in the state of placing it on the upper part of (3B) so that the structure (10) is placed inside the mold (3) for producing the outer shell.
8. The method according to claim 6,

   In the skin forming step (S300), the one or more grooves 11 formed with an inclined surface formed on a portion of the lower surface of the structure 10 is used, the outer shell manufacturing mold (3) for forming the shell 20 A method of manufacturing a thermoplastic cast, characterized in that the movable insert spacer (3E) is formed in a shape corresponding to the groove (11) in which the inclined surface is formed, respectively inserted into the one or more grooves.
9. The method according to claim 8,

   The outer shell manufacturing mold (3) is provided with a movable support spacer (3F) in the opposite direction to the movable insert spacer (3E), respectively.
10. The method according to any one of claims 6 to 9,

    In the skin forming step (S300), the mold for manufacturing the skin 3 is provided with a movable support spacer (3G, 3H, 3I, 3J) by the movable support spacer (3G, 3H, 3I, 3J) the structure ( 10) is a method of producing a thermoplastic cast, characterized in that the shell 20 is configured to be molded to a predetermined thickness by placing it in the inner center of the mold for manufacturing the shell (3).
11. The method according to claim 6,

    The polycaprolactone composite material is a method of producing a thermoplastic cast, characterized in that the fiber-reinforced glass fiber, carbon fiber or polyethylene terephthalate fiber is added.
12. The method according to claim 6,

    The polycaprolactone composite material is a polyethylene, polyurethane or polybutene is added, characterized in that the manufacturing method of the thermoplastic cast.
13. The method according to claim 6,

    The nucleating agent of any one of talc, sorbitol or sodium benzoate is added to the polycaprolactone composite material.

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