JP2010201902A - Thin-walled resin molding and mold for molding the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thin-walled resin molding which has an excellent resin flow in molding, suppresses sink marks, and has high rigidity, and to provide a mold for molding a thin-walled resin molding. <P>SOLUTION: A door trim 1 as the thin-walled resin molding includes a general part 2 having a wall thickness of 1.0-1.8 mm, and a thick part 3 having a wall thickness larger than the general part 2 and not more than 3.0 mm. In the non-designed surface 1b side of the door trim 1, the thick part 3 protrudes more than the general part 2. The thick part 3 continuously extends at least in one direction among surface directions of the non-designed surface 1b of the door trim 1. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a thin resin molded product having a small thickness formed by an injection molding method, and a molding die for molding a thin resin molded product used in manufacturing the same.

  It is considered to reduce the thickness of resin molded products in order to reduce weight and save materials. However, when the wall thickness is reduced, the resin flow at the time of injection molding is deteriorated, and there is a case where a so-called short shot, in which a molded product having an incomplete shape is formed, occurs. In addition, the thickness of the thin molded product is reduced in rigidity due to a decrease in the moment of inertia of the cross section. For this reason, there existed a possibility of bending or deform | transforming with some load.

  Therefore, conventionally, ribs are provided on the non-design surface of the thin resin molded product in order to compensate for the lack of rigidity. A thin resin molded product is formed by injection molding of a resin material. The molten resin material shrinks when cooled and solidified. The rib-installed portion where the wall thickness is thick is slower in cooling the resin material than other general portions. For this reason, a rib installation part solidifies, shrinking | contracting, after the resin material of a general part solidifies. Therefore, sink marks are generated on the design surface of the rib installation part of the thin-walled resin molded product, which causes the appearance of the design surface to be impaired.

  Therefore, in order to suppress the occurrence of sink marks in the resin molded product with ribs, FIG. 4 of Patent Document 1 includes a foamed resin base material (21), a rib (22) integrated on the inner surface side, and a surface side. The laminated structure which consists of a decorating material (23) which is located in and has cushioning properties is disclosed. In manufacturing this laminated structure, a foamed resin sheet and a decorating material are set in the cavity of the molding die, the mold is clamped, and a molten resin for ribs is injected and filled in the groove portion in the cavity. The shrinkage distortion when the molten resin is cooled and solidified by loosening the mold is absorbed by the restoring action of the decorating material and the foamed resin sheet to avoid the occurrence of sink marks on the surface of the molded product.

JP 2008-68598 A

  However, in patent document 1, in order to absorb the shrinkage | contraction when the molten resin for rib shaping | molding cools and solidifies, the laminated body which consists of a foamed resin sheet and a decorating material is previously set in the cavity. For this reason, the manufacturing process of the resin molded product with a rib increases, and it leads to a manufacturing cost increase. Moreover, since a resin molded product consists of a laminated body of a foaming resin material and the decorating material which has cushioning properties, rigidity becomes low and it cannot be used for the part where intensity | strength is requested | required.

  The present invention has been made in view of such circumstances, and has a good resin flow at the time of molding, suppresses sink marks, and has a thin resin molded product having high rigidity, and a thin resin molded product used for molding this. It is an object to provide a mold.

  The thin resin molded product of the present invention has a general part with a thickness of 1.0 to 1.8 mm and a thick part with a thickness larger than the thickness of the general part and not more than 3.0 mm. The thin-walled resin molded product, wherein the thick-walled portion protrudes from the general portion toward the non-design surface of the thin-walled resin-molded product, and is at least one of the surface directions of the non-design surface of the thin-walled resin molded product It is characterized by extending continuously.

  The thin resin molded product of the present invention is provided with a thick portion that is thicker than the general portion. For this reason, the rigidity of the thin-walled resin molded product is higher than that of the thin-walled resin molded product consisting of only the general part. Moreover, the thickness of a thick part is 3.0 mm or less. For this reason, it is possible to prevent the occurrence of sink marks on the design surface of the thick portion. Moreover, the thick part is continuously extended in at least one direction among the surface directions of the non-design surface of the thin resin molded product. For this reason, the molten resin material tends to flow in the extending direction of the thick portion. Therefore, the resin flow at the time of injection molding is good, and the resin material is sufficiently distributed throughout the thin resin molded product through the thick part, so that a problem of so-called short shot can be prevented.

  The ratio of the thickness of the thick part to the thickness of the general part is preferably 1.5 to 3.0. In this case, the rigidity of the thin resin molded product can be effectively increased while suppressing the occurrence of sink marks. Also, the short shot can be effectively suppressed.

  The width of the thick part is preferably 5 to 20 mm. In this case, it is possible to achieve both weight reduction and sufficient rigidity of the thin resin molded product.

  It is preferable that a gradually changing portion in which the thickness gradually increases from the general portion toward the thick portion is formed between the thick portion and the general portion. In this case, the resin flow from the thick part to the general part is further improved, and the occurrence of sink marks can be effectively suppressed.

  The width of the gradually changing portion is preferably 30 to 50 mm. In this case, the resin flow from the thick part to the general part is further improved, and sink marks can be more effectively suppressed.

  The thick portion is preferably formed in a lattice shape on the thin resin molded product. In this case, the rigidity in the surface direction of the thin resin molded product can be improved in a balanced manner.

  The molding die for molding a thin resin molded product of the present invention is a molding die used when injection molding a thin resin molded product having a general part with a wall thickness of 1.0 to 1.8 mm. The mold includes a cavity having a shape corresponding to the thin resin molded product, and a gate for injecting resin into the cavity, and the cavity includes a general part molding part having the same thickness as the thickness of the general part. And a thick part molding part having a thickness larger than the thickness of the general part molding part and having a thickness of 3.0 mm or less, and the thick part molding part continuously from the gate to the tip in the resin flow direction. The molding surface that extends and forms the non-design surface of the thin resin molded product of the cavity is recessed in the thick portion molding portion on the outer side in the thickness direction than the general portion molding portion.

  According to the present invention, the cavity has the thick part molded part having a thickness larger than the thickness of the general part molded part. For this reason, the resin injected from the gate flows without stagnation to the front end in the resin flow direction while spreading the resin through the thick portion molding portion to the surrounding general portion molding portion. Therefore, the resin can fill the entire cavity, and a completely shaped thin resin molded product can be reliably molded. In addition, the molded thin resin molded product is free from sink marks on the design surface, and the thicker thicker portion than the general portion is formed, thereby increasing the rigidity of the thin resin molded product.

  The thin resin molded product of the present invention has a thick part having a thickness larger than that of the general part and having a thickness of 3.0 mm or less. For this reason, the rigidity of the thin-walled resin molded product is high, and sink marks are hardly generated on the design surface. Furthermore, the resin flow at the time of molding is good, and a completely shaped molded product can be reliably molded.

  According to the mold for molding the thin resin molded product of the present invention, the same effect as that of the thin resin molded product can be obtained.

FIG. 1 is a perspective view of a door trim according to the first embodiment. FIG. 2 is a cross-sectional view of a main part of the door trim according to the first embodiment. FIG. 3 is a cross-sectional view of a mold for molding the door trim according to the first embodiment. FIG. 4 is a perspective view of the door trim according to the second embodiment. FIG. 5 is a perspective view of the instrument panel of the third embodiment.

  A thin-walled resin molded product is composed of a general part with a small thickness and a thick part that is thicker than the general part. The general part is a part having the original thickness of the resin molded product, and the thick part is a part that is thicker than the general part and has the largest thickness.

  The general part extends over a wide range in the surface direction in the overall shape of the thin resin molded product. The general part may extend in a planar shape, or a part or the whole thereof may be curved or bent. The overall shape of the thin-walled resin molded product is various shapes that the thin-walled product can take, for example, a plate shape, an arch shape, a box shape, and the like. The thin resin molded product has a front surface and a back surface in the thickness direction as a design surface and a non-design surface, respectively.

  The thickness of the general part is 1.0 to 1.8 mm. If it is less than 1.0 mm, the resin flow in the general part may be reduced, and a resin-deficient part may occur in the general part. If it exceeds 1.8 mm, the objectives of material saving and weight reduction of the molded product cannot be sufficiently achieved.

  The wall thickness of the general part is preferably 1.3 to 1.8 mm. In this case, the purpose of weight reduction and material saving can be effectively achieved while improving the resin flow in the general part.

  The thickness of the thick part is larger than the thickness of the general part and is 3.0 mm or less. When the thickness exceeds 3.0 mm, there is a risk that the design surface of the thick-walled portion may have a sink and damage the appearance of the design surface.

  The thickness of the thick part is preferably 1.8 to 3.0 mm. In this case, there is no sink on the design surface of the thick wall portion, the rigidity of the thin resin molded product can be increased, and the resin flow during molding can be improved.

  The ratio of the thickness of the thick part to the thickness of the thin part is preferably 1.5 to 3.0, and more preferably 1.5 to 2.0. In this case, sink marks on the design surface can be effectively suppressed while sufficiently increasing the rigidity of the thin resin molded product.

  The design surface of the thick portion is flush with the design surface of the general portion. That is, the design surface of the thick portion forms the design surface of the thin resin molded product together with the design surface of the general portion.

  The thick portion protrudes from the general portion on the non-design surface side of the thin resin molded product. The difference in thickness between the thick part and the general part on the non-design surface, that is, the protruding amount from the general part of the thick part to the non-design surface side is greater than 0 mm and 2.0 mm or less. It is preferable that In this case, sink marks on the design surface can be effectively suppressed while sufficiently increasing the rigidity of the thin resin molded product.

  The width of the thick part refers to the width in the direction orthogonal to the extending direction of the thick part and the thickness direction. The width of the thick part is not particularly limited, but is preferably 5 to 20 mm. In this case, the thickness of the thin resin molded product is reduced and the rigidity is high, and the resin flow during molding is further improved.

  The thick portion continuously extends in at least one direction among the surface directions of the non-design surface of the thin resin molded product. The surface direction refers to the spreading direction of the non-design surface of the thin resin molded product. For example, the thick portion may extend continuously from one end portion to the other end portion in at least one direction in the surface direction. The extending direction of the thick portion is preferably parallel to the resin flow direction during resin molding, and may be either a straight line or a curved line. The thick portion is formed, for example, in a lattice shape or in one or a plurality of lines.

  The pitch in the width direction of the thick portion is not particularly limited, but is preferably 100 to 300 mm in order to achieve both weight reduction and rigidity of the thin resin molded product.

  It is preferable to provide a gradual change part between the general part and the thick part. The gradually changing portion is a portion where the thickness gradually increases from the general portion toward the thick portion. The wall thickness of the gradually changing portion may increase linearly from the general portion toward the thick portion, or may increase in a curved line or a plurality of steps. The wall thickness of the gradually changing portion is preferably changed linearly. In this case, sink marks in the thick part can be effectively suppressed.

  It is preferable that the gradually changing portion is formed over the entire boundary portion between the general portion and the thick portion. That is, it is preferable that gradually changing portions extend in parallel with the thick portion on both sides in the width direction of the thick portion. In this case, there is no step portion between the general portion and the thick portion, the resin flow during molding becomes good, and sink marks can be effectively suppressed.

  The width of the gradually changing portion refers to a width in a direction orthogonal to the extending direction of the gradually changing portion and the thickness direction. The width of the gradually changing portion is not particularly limited, but is preferably 30 to 50 mm in order to form the thick portion on the resin molded product at an appropriate pitch.

  A mold for molding a thin resin molded product includes a cavity having a shape corresponding to the thin resin molded product, and a gate for injecting resin into the cavity. The cavity has a general part molded part having the same thickness as the thickness of the general part, and a thick part molded part having the same thickness as the thickness of the thick part. The thick-walled portion molding portion extends continuously from the gate to the tip in the resin flow direction. The molding surface that forms the non-design surface of the thin-walled resin molded product of the cavity is recessed in the thickness direction outside of the general part molding part in the thick part molding part, so that the thickness of the thick part molding part is the general part molding part It becomes larger than the thickness. For this reason, the resin flow resistance in the thick wall molded part can be lowered.

  The gate is open to the thick part molding part. The opening position of the gate in the cavity may be the end part or the center part of the thick part molding part. In the case where a plurality of thick part molding parts are arranged in the cavity so as to be separated from each other without contacting the general part molding part, at least one gate may be opened in each thick part molding part.

  Thin-walled resin molded products can be used for vehicle parts such as vehicle interior parts such as instrument panels, dash boxes and door trims, vehicle exterior parts such as bumpers, and chassis parts such as engine covers and tank covers.

  The thin-walled resin molded product of this example is a door trim provided as a lining of a vehicle door. FIG. 1 is a perspective view of a door trim. In FIG. 1, up, down, front, back, right, and left are directions seen from the occupant seated in the vehicle. The same applies to FIGS. 4 and 5 described later.

  As shown in FIG. 1, the door trim 1 includes a main body portion 11 that has a substantially flat and substantially square shape, and a side wall portion 12 that protrudes from the periphery of the main body portion 11 toward the outside of the vehicle. An armrest portion 13 is provided in the center of the main body portion 11 in the vertical direction. The armrest portion 13 extends in the vehicle front-rear direction and protrudes toward the vehicle interior side. The surface facing the vehicle interior side of the door trim 1 is a design surface 1a, and the surface facing the vehicle interior side is a non-design surface 1b (FIG. 2).

  As shown in FIGS. 1 and 2, the door trim 1 has a general portion 2 having a thin thickness and a thick portion 3 that is thicker than the general portion 2. The side portion 12 of the door trim 1, the armrest portion 13 of the main body portion 11, and the upper portion 11 a located above the armrest portion 13 are composed of a general portion 2.

  The lower part 11 b located below the armrest part 13 of the main body part 11 is composed of a general part 2 and a thick part 3. The design surface 1a of the thin resin molded product 1 has the lower surface 11b of the main body 11 and the design surface 1a has a planar shape. A lattice-shaped thick portion 3 is formed between the general portions 2 in the lower portion 11 b of the main body portion 11. The thick part 3 includes a vertical part 31 extending in the vertical direction of the lower part 11 b of the main body part 11 and a horizontal part 32 extending in the front-rear direction. The vertical part 31 of the thick part 3 extends linearly from the armrest part 13 to the lower end part of the lower part 11b. The vertical portion 31 extends linearly from the front end portion to the rear end portion of the lower portion 11b. A plurality of the vertical portions 31 are arranged at equal intervals in the front-rear direction of the lower portion 11b. The lateral part 32 of the thick part 3 is arranged at the center part in the vertical direction of the lower part 11b. The vertical portion 31 and the horizontal portion 32 intersect at a right angle.

  As shown in FIG. 2, the thickness A of the general part 2 is 1.3 mm, and the thickness B of the thick part 3 is 2.5 mm. The ratio of the thickness of the thick part 3 to the thickness of the general part 2 is 1.9. The design surface 1 a of the door trim 1 is flush with the thick portion 3 and the general portion 2. On the non-design surface 1 b of the door trim 1, the thick portion 3 protrudes by 1.2 mm outward in the thickness direction from the general portion 2. The thick part 3 has a lattice shape. The width C of the thick part 3 is 5 mm, and the pitch of the vertical parts 31 of the thick part 3 is 200 mm.

  Between the general part 2 and the thick part 3, a gradual change part 4 in which the thickness increases linearly from the general part 2 toward the thick part 3 is formed. The gradually changing portion 4 is formed on the entire boundary portion between the general portion 2 and the thick portion 3. The width D of the gradually changing portion 4 is 40 mm.

  In forming the door trim 1, as shown in FIG. 3, a forming die 5 is used. The mold 5 includes an upper mold 51, a lower mold 52, and a gate 53. A cavity 50 is formed between the upper mold 51 and the lower mold 52. The cavity 50 has a shape corresponding to the door trim 1. The design surface 1 a of the thin resin molded product 1 is formed by the molding surface of the upper mold 51, and the non-design surface 1 b is formed by the molding surface of the lower mold 52. The cavity 50 includes a general part molding part 50 a that molds the general part 2 of the door trim 1, a thick part molding part 50 b that molds the thick part 4, and a gradual change part molding part 50 c that molds the gradual change part 4. Have.

  The thickness of the general part molding part 50 a is the same as the thickness of the general part 2 of the door trim 1, and the thickness of the thick part molding part 50 b is the same as the thickness of the thick part 3 of the door trim 1.

  The symbol G in FIG. 1 indicates the opening position of the gate. The gate opens to the molding surface of the lower mold 52. The gate is open to the thick portion molding portion 50b located in the center portion in the front-rear direction of the lower portion 11b of the main body portion 11 in the vertical direction.

  Resin material is injected from the gate into the cavity. When the resin material is injected from the gate, it flows into the thick portion molding portion 50b of the cavity 50 as shown in FIG. While circulating through the thick part molding part 50b, it also reaches the general part molding part 50a around the thick part molding part 50b. Then, the entire cavity 50 is filled with the resin material.

  The door trim 1 of this example is provided with a thick portion 3 that protrudes toward the non-design surface 1 b and is thicker than the general portion 2. For this reason, the rigidity of the door trim 1 is higher than that of the door trim 1 including only the general portion 2. Moreover, the thick part 3 is continuously extended in two directions of the up-down direction and the front-back direction among the surface directions of the non-design surface 1b. For this reason, the resin flow at the time of injection molding is good, and the resin material is sufficiently distributed throughout the door trim 1. Therefore, it is possible to prevent a so-called short shot.

  Between the general part 2 and the thick part 3, a gradually changing part 4 is formed in which the amount of protrusion gradually increases from the general part 2 toward the thick part 3. For this reason, stress concentration at the boundary portion between the general portion 2 and the thick portion 3 can be suppressed, and the rigidity of the door trim 1 is further increased.

  The thick part 3 is formed in a lattice shape on the lower part 11 b of the main body part 11. For this reason, the rigidity of the surface direction of the door trim 1 can be improved with good balance.

  Further, the cavity 50 of the mold 5 for molding the door trim 1 has a thick portion molding portion 50b having a thickness larger than the thickness of the general portion molding portion 50a. For this reason, the resin material injected from the gate 53 passes through the thick portion molding portion 50b and reaches the peripheral general portion molding portion 50a, and flows without stagnation to the tip in the resin flow direction. Therefore, the resin material can be filled in the entire cavity 50, and the complete door trim 1 can be reliably molded.

  In this example, as shown in FIG. 4, the thick part 3 formed in the lower part 11b of the door trim 1 is composed of a plurality of vertical parts 31 extending in the vertical direction, and the horizontal part extending in the front-rear direction is The point which is not provided is different from the first embodiment.

  In forming the door trim 1 by injection molding, as shown in FIG. 4G, a gate opens at a portion corresponding to the lower end portion of the door trim 1 in the cavity of the molding die. The gates are respectively disposed in portions corresponding to the lower ends of the plurality of vertical portions 31 on the molding surface of the lower mold surrounding the cavity. When the resin material is injected into the cavity from the gate, it passes through each vertical portion 31 constituting the thick portion 3 and flows into the general portion 2 around the vertical portion 31, while the end portion where the gate of the vertical portion 31 is disposed Resin flows in the opposite direction. Eventually, the entire cavity is filled with resin, and a complete door trim 1 is formed.

  Also in this example, since the thick portion 3 extending in the vertical direction is formed in the lower portion 11b of the door trim 1, it is lightweight, has high rigidity, and does not cause sink marks. Moreover, shortage of resin flow such as short shot can be effectively suppressed.

  The thin resin molded product of this example is an instrument panel 7 of a vehicle as shown in FIG. The instrument panel 7 is provided in front of the passenger compartment. The instrument panel 7 includes a front portion 71 that faces the occupant and an upper portion 72 that is provided on the upper portion of the front portion 71. The front unit 71 includes a display unit 71a in which meters such as a speedometer are disposed in a portion located on the front side of the operator, a storage unit 71b that is provided in front of the passenger seat and accommodates accessories, and the operator And an operation unit 71c provided in front of the passenger seat and provided with an operation panel of an air conditioner or an audio device. The upper portion 72 extends in a substantially horizontal direction toward the upper side of the passenger compartment. The instrument panel 7 has a design surface 7a on the vehicle interior side and a non-design surface 7b on the vehicle interior side.

  The front part 71 of the instrument panel 7 is composed of the general part 2, and the upper part 72 is composed of the general part 2 and the thick part 3. The thick portion 3 of the upper portion 72 has a plurality of vertical portions 31 that extend linearly in the front-rear direction and a horizontal portion 32 that is orthogonal to the substantially central portion of the vertical portion 31 in the front-rear direction. The vertical portions 31 are arranged at equal intervals from the left end portion to the right end portion of the upper portion 72. The lateral portion 32 is formed in a straight line from the left end portion to the right end portion of the upper portion 72.

  A gradually changing portion 4 is formed between the thick portion 3 and the general portion 2 (see FIG. 2). The thickness of the thick part 3 is 3.0 mm, and the thickness of the general part 2 is 1.8 mm. The pitch of the vertical part 31 of the thick part 3 is 250 mm, and the width of the thick part 3 is 10 mm. The width of the gradually changing portion 4 is 40 mm. Other configurations are the same as those of the first embodiment.

  The instrument panel 7 is formed by injection molding using a molding die, similarly to the door trim 1 of the first embodiment. Similar to the first embodiment, the cavity of this mold has a thick portion molding portion for molding the thick portion 3 of the instrument panel 7. The thick-wall molded part continuously extends from the gate to the tip in the resin flow direction. As shown in FIG. 5G, the gate provided in the mold is opened at a portion corresponding to the left end portion of the instrument panel 7 in the cavity of the mold. The gate is disposed at a portion corresponding to the left end portion of the thick portion 3 on the molding surface of the lower mold surrounding the cavity.

  Also in the front part 71 of the instrument panel 7 of this example, like the lower part 11b of the door trim 1 of Example 1, since the grid-like thick part 3 is formed, the rigidity is high and the weight is low. Also, the resin flow during molding is good and no sink marks occur.

(Experiment)
The door trim of Example 1 was formed by changing the thickness of the thick portion 3. The thickness of the thick portion was set to 2.0 mm, 2.5 mm, and 3.0 mm, and door trims having respective thicknesses were molded a plurality of times using a molding die. The wall thickness of the general part was 1.3 mm. Other door trim configurations and molding methods were the same as in Example 1.

  As a result, when the thickness of the thick part is 2.0 mm, 2.5 mm, or 3.0 mm, the occurrence of sink marks on the design surface of the door trim is suppressed, and there is no problem due to insufficient resin flow such as a short shot. . Furthermore, when the thickness of the thick part was 2.0 mm or 2.5 mm, no sink marks were generated on the design surface of the door trim.

  From this, the thickness of the thick part 3 is preferably thicker than the thickness of the general part 1 and not more than 3.0 mm, and the thickness of the thick part 3 with respect to the thickness of the thin part 1 It can be seen that the ratio is preferably 1.5 to 3, and more preferably 1.5 to 2.0.

1: Door trim, 1a: Design surface, 1b: Non-design surface, 2: General part, 3: Thick part, 4: Gradual change part, 5: Mold, 7: Instrument panel, 7a: Design surface, 7b: Non-design surface, 11: body part, 11a: upper part, 11b: lower part, 12: side wall part, 13: armrest part, 31: vertical part, 32: horizontal part, 33: lattice coupling part, 50: cavity, 50a : General part molding part, 50b: Thick part molding part, 50c: Gradual change part molding part, 51: Upper mold, 52: Lower mold, 71: Front part, 72: Upper part, G: Gate position.

Claims (7)

A thin resin molded article having a general part having a thickness of 1.0 to 1.8 mm and a thick part having a thickness larger than the thickness of the general part and not more than 3.0 mm,
The thick portion protrudes from the general portion toward the non-design surface side of the thin resin molded product and continuously extends in at least one direction of the surface direction of the non-design surface of the thin resin molded product. Thin resin molded product characterized by   The thin resin molded product according to claim 1, wherein a ratio of the thickness of the thick part to the thickness of the general part is 1.5 to 3.0.   The thin resin molded product according to claim 1 or 2, wherein the thick portion has a width of 5 to 20 mm.   4. The gradual change portion in which the thickness gradually increases from the general portion toward the thick portion is formed between the thick portion and the general portion. 5. The thin-walled resin molded product according to Item.   The thin resin molded article according to claim 4, wherein the gradually changing portion has a width of 30 to 50 mm.   The thin-walled resin molded product according to any one of claims 1 to 5, wherein the thick portion is formed in a lattice shape on the thin-walled resin molded product. A mold used for injection molding a thin resin molded product having a general part with a wall thickness of 1.0 to 1.8 mm,
The mold has a cavity having a shape corresponding to the thin resin molded product, and a gate for injecting resin into the cavity.
The cavity has a general part molding part having the same thickness as the thickness of the general part, and a thick part molding part having a thickness larger than the thickness of the general part molding part and not more than 3.0 mm,
The thick part molding part extends continuously from the gate to the tip in the resin flow direction, and the molding surface forming the non-design surface of the thin resin molded product of the cavity is the thick part molding part. A molding die for molding a thin-walled resin molded product, characterized in that it is recessed outward in the thickness direction from the general molded portion.

Images