JP2018020470A - Injection molded article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively suppress the occurrence of appearance failure of an injection molded article body in an injection molded article having a tabular extension portion extending from the injection molded article body into a tubular shape.SOLUTION: There is provided the injection molded article configured in such a manner that a gate mark 14b is formed on a rear face 14a of a tabular extension portion 14 and a recess groove 14c is formed between a formation position of the gate mark 14b in the tabular extension portion 14 and a connection position with a molded article body 12. Thereby a ridge part corresponding to the recess groove 14c is formed in a portion of the tabular extension portion 14 in a mold inside space, so that when the melting resin flowing a hot liner is merged while divided inn a fork-shape around a valve pin and injected to the mold inside space from a gate, smooth flow of a melting rein is disturbed by the ridge part to be brought into a turbulent flow state thereby a resin boundary surface generated at a merging part of the melting resin is physically broken and generation of molding failure of heart-shaped flow mark or the like on the molded article body 12 is prevented in advance.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an injection molded product provided with a plate-like extension extending in a plate shape from a molded product body.

  Conventionally, as one method of injection molding, for example, as described in “Patent Document 1”, a two-color molded product composed of a primary molded product made of transparent resin and a secondary molded product made of opaque resin is injected. A method of forming is known.

  Conventionally, a structure using a hot runner is known as a structure of an injection mold.

JP 2014-176974 A

  When injection molding a primary molded product in a two-color molded product, a hot runner is often used due to space limitations.

  At that time, when the two-color molded product is, for example, a translucent cover of a vehicle headlamp, the gate mark does not appear on the design surface (that is, the surface that is visible when mounted on the vehicle). In many cases, the gate position is set to a plate-like extension extending in a plate shape from the molded product body of the primary molded product.

  However, when the structure of the hot runner has a valve pin for opening and closing the gate, the molten resin flowing through the hot runner merges so that it wraps around the valve pin in a bifurcated state. Since it is injected into the mold space, a resin boundary surface is generated at the molten resin merging portion, and the molten resin is applied to the molded product body portion through the plate-like extension portion while maintaining this resin boundary surface. Will flow in.

  For this reason, in the mold inner space, the molten resin that has flowed into the molded product body causes a heart-shaped flow mark on the molded product body, resulting in molding such as weld lines and silver streaks. A defect will occur. As a result, a defective appearance occurs in the molded product body.

  Such a problem is not limited to a primary molded product in a two-color molded product, but also in a normal injection molded product, when molding is performed with an injection mold having a hot runner having a valve pin. This is a possible problem.

  The present invention has been made in view of such circumstances, and in an injection molded product provided with a plate-like extension extending in a plate shape from the molded product body, an appearance defect occurs in the molded product body. An object of the present invention is to provide an injection molded product capable of effectively suppressing the above.

  In the present invention, the object is achieved by devising the configuration of the plate-like extension portion.

That is, the injection molded product according to the present invention is
In an injection molded product comprising a molded product body and a plate-like extension extending in a plate shape from the molded product body,
Gate marks are formed on the first plate surface of the plate-like extension,
An uneven portion is formed between the formation position of the gate mark and the connection position with the molded product main body in the plate-like extension portion.

  The “plate-like extension” is not particularly limited as long as it is formed so as to extend from the molded product body in a plate shape.

  The “first plate surface” may be any plate surface in the plate-like extension.

  The specific shape of the “uneven portion” is not particularly limited as long as the cross-sectional shape is changed with respect to the other general portions of the plate-like extension portion.

  The injection molded product according to the present invention has a configuration in which a gate mark is formed on the first plate surface of the plate-like extension extending in a plate shape from the molded product body, but the gate mark formation position in the plate-like extension Since the concavo-convex part is formed between the connection position of the molded product body and the molded product main body, the plate-like extension part of the injection mold for molding the injection molded product is also formed in the mold inner space. An uneven part will be formed in the part.

  Therefore, when the molten resin flowing through the hot runner circulates around the valve pin in a bifurcated state and is injected from the gate into the mold inner space, the molten resin extends into a plate shape in the mold inner space. A smooth flow is disturbed by the concavo-convex portion formed in the portion, resulting in a turbulent state, whereby the resin boundary surface generated in the molten resin joining portion is physically destroyed.

  Then, the molten resin stirred in such a turbulent state flows into the part of the molded product body, so that a heart-shaped flow mark is generated in the molded product body as in the past. It is possible to prevent the occurrence of molding defects such as weld lines and silver streaks due to this. Therefore, it is possible to effectively prevent the appearance defect from occurring in the molded product body.

  As described above, according to the present invention, in an injection molded product having a plate-like extension extending in a plate shape from the molded product body, it is possible to effectively suppress the appearance defect from occurring in the molded product body. it can.

  In the said structure, if it is set as the structure by which the uneven | corrugated | grooved part was formed so that a plate-shaped extension part might be crossed over the full width, the molten resin which passes through the part of a plate-shaped extension part can be stirred efficiently.

  In addition, if the concavo-convex part is constituted by a concave groove formed on the first plate surface of the plate-like extension part, the following operational effects can be obtained.

  That is, since the concave and convex portions are constituted by concave grooves, when the molten resin flows through the plate-like extension portion, the flow path suddenly narrows in the middle of the molten resin, so that the temperature of the molten resin can be increased by shearing heat generation. Thereby, the resin interface can be remelted. Therefore, the resin boundary surface that causes the generation of the heart-shaped flow mark can be thermally destroyed.

  In addition, since the concave groove is formed on the first plate surface of the plate-like extension portion similarly to the gate trace, it is possible to easily perform mold processing for forming the uneven portion.

  In the above configuration, when the injection molded product is configured as a primary molded product in a two-color molded product, a hot runner is often used as the mold structure due to space limitations. Employing the configuration is particularly effective.

  In this case, when the two-color molded product is composed of a primary molded product made of transparent resin and a secondary molded product made of opaque resin, the first plate of the plate-like extension is used as the primary molded product. If it is configured so that the secondary molded product can be laminated on the surface, it is possible to make it difficult to see the gate trace and the uneven portion when the completed two-color molded product is observed.

The front view which shows the two-color molded product provided with the injection molded product which concerns on one Embodiment of this invention as a primary molded product II-II sectional detail view of FIG. (A) is the perspective view which shows the principal part of the said injection molded product seen from the IIIa arrow direction of FIG. 2, (b) is the same as (a) which shows the principal part of the 1st modification of the said embodiment. Figure Side sectional view showing a main part of an injection mold for molding the injection molded product (A) is a front view which shows the principal part of the conventional injection molded product, (b) is a perspective view which shows the principal part of the injection mold for shape | molding the said conventional injection molded product. Side cross-sectional perspective view which shows the principal part of the 2nd-4th modification of the said embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a front view showing a two-color molded product 100 provided with an injection molded product according to an embodiment of the present invention as a primary molded product 10. 2 is a detailed sectional view taken along the line II-II in FIG.

  As shown in FIG. 1, the two-color molded product 100 is a translucent cover for a headlamp disposed at the right front end of the vehicle.

  The two-color molded product 100 includes a front surface portion 100A that is formed in a horizontally elongated substantially rectangular shape when viewed from the front of the lamp, a peripheral surface portion 100B that extends substantially rearward from the outer peripheral edge of the front surface portion 100A, and a rear surface of the peripheral surface portion 100B. And a flange portion 100C extending from the end position toward the outer peripheral side. And when this two-color molded product 100 is mounted | worn with a vehicle, the front-surface part 100A comprises the design surface extended along the surface shape of a vehicle body.

  In the two-color molded product 100, a secondary molded product 20 made of an opaque resin (for example, a black ABS resin) is arranged around a primary molded product 10 made of a transparent resin (for example, made of a colorless and transparent PC resin). It becomes the composition.

  As shown in FIG. 2, the two-color molded product 100 is laminated with the primary molded product 10 and the secondary molded product 20 positioned on the outer peripheral side in the peripheral surface portion 100B. It becomes the composition.

  The primary molded product 10 includes a molded product main body 12 and a plate-like extension 14.

  The molded product main body 12 is formed such that the peripheral surface constituting portion 12a constituting the outer peripheral side portion of the peripheral surface portion 100B extends to the vicinity of the rear end surface of the peripheral surface portion 100B.

  The plate-like extension portion 14 is formed on the lower side of the molded product main body 12 so as to extend downward from a substantially central position in the left-right direction at the rear end edge of the peripheral surface constituting portion 12a.

  On the other hand, the secondary molded product 20 is formed such that the front end portion of the peripheral surface constituting portion 20a constituting the inner peripheral side portion of the peripheral surface portion 100B extends to the outer peripheral edge portion of the front surface portion 100A.

  Thereby, most of the front surface portion 100A of the two-color molded product 100 is constituted by the primary molded product 10, and the peripheral surface portion 100B is constituted by the primary and secondary molded products 10, 20, Most of the flange portion 100 </ b> C is constituted by the secondary molded product 20.

  FIG. 3A is a perspective view showing the main part of the primary molded product 10 as seen from the direction of the arrow IIIa in FIG.

  As shown in FIG. 3A, the plate-like extension 14 is formed in a tongue shape. Specifically, the plate-like extension portion 14 is formed so as to taper downward in a front view, and its tip end surface is formed in an arc shape.

  On the rear surface 14a as the first plate surface in the plate-like extension portion 14, a gate mark 14b is formed at the lower end portion.

  Further, a concave groove 14 c as an uneven portion is formed between the formation position of the gate mark 14 a in the plate-like extension portion 14 and the connection position of the molded product body 12. The concave groove 14c is formed on the rear surface 14a of the plate-like extension 14 so as to cross the plate-like extension 14 over the entire width. At this time, the concave groove 14c has a V-shaped cross-sectional shape and is formed to extend in an arc shape around the position of the gate mark 14b.

  As shown in FIG. 2, the flange forming portion 20 b constituting the flange portion 100 </ b> C of the two-color molded product 100 in the secondary molded product 20 is laminated from the rear side with respect to the plate-like extension 14 of the primary molded product 10. ing. At that time, the rear surface 14a of the plate-like extension portion 14 is covered with the secondary molded product 20 over the entire area, and an opaque resin constituting the secondary molded product 20 enters the concave groove 14c. Further, the flange constituting portion 20b of the secondary molded product 20 is formed so that the front surface thereof is substantially flush with the front surface of the plate-like extension portion 14 of the primary molded product 10, whereby the plate-like extension portion 14 is formed. Is configured as a part of the flange portion 100 </ b> C of the two-color molded product 100. In addition, the leg part 20c which protrudes toward back from the outer periphery vicinity site | part is formed in the rear surface of the secondary molded product 20 over the perimeter.

  Next, a mold structure for molding the primary molded product 10 will be described.

  FIG. 4 is a side sectional view showing the main part of an injection molding die 50 for molding the primary molded product 10.

  As shown in the figure, this injection mold 50 includes a core side mold 52 for forming the rear surface shape of the primary molded product 10 and a cavity side for forming the front surface shape of the primary molded product 10. A mold 54 is provided, and the mold dividing surface is set at the position of the rear end surface of the peripheral surface constituting portion 12a of the molded product body 12 (that is, the plane including the rear surface 14a of the plate-like extension portion 14).

  The injection mold 50 is formed on the core mold 52 side in the mold inner space C formed when the core mold 52 and the cavity mold 54 are clamped. By injecting molten resin R from the gate G, the primary molded product 10 is molded.

  A hot runner 56 is arranged on the core side mold 52 so as to face the gate G. The hot runner 56 has a configuration in which a valve pin 58 is disposed in a flow path P for sending out the molten resin R. The valve pin 58 is retracted to the rear of the gate G when the molten resin R is injected, and moves forward to a position where the gate G is closed when the injection of the molten resin R is completed.

  The flow path P of the hot runner 56 is formed in a cylindrical shape with an inner diameter larger than the outer diameter of the valve pin 58. The flow path P guides the molten resin R that has flowed into the flow path P obliquely from the lower rear in the middle of the valve pin 58 to the gate G along the outer peripheral surface of the valve pin 58.

  At the upper part of the gate G on the mold dividing surface 52a of the core side mold 52, a protrusion 52c for forming the concave groove 14c of the plate-like extension 14 is formed. The protrusion 52c has a V-shaped cross-sectional shape and is formed to extend in an arc shape around the position of the gate G.

  Next, the effect of this embodiment is demonstrated.

  Fig.5 (a) is a front view which shows the principal part of the conventional primary molded product 10 '.

  This primary molded product 10 'has the same basic configuration as the primary molded product 10 according to the present embodiment. That is, the primary molded product 10 'has a configuration in which a gate mark 14b' is formed on a rear surface 14a 'of a plate-like extension 14' extending in a plate shape from the molded product body 12 '. However, the plate-like extension 14 ′ of the primary molded product 10 ′ has a concave groove 14c in the primary molded product 10 between the formation position of the gate mark 14b ′ and the connection position of the molded product main body 12 ′. Corresponding uneven portions are not formed.

  For this reason, a heart-shaped flow mark F is generated in the molded product main body 12 'of the primary molded product 10'. Due to this, molding of a weld line W, a silver streak (not shown) or the like is performed. A defect has occurred.

  Such defective molding occurs for the following reason.

  FIG. 5B is a perspective view showing the main part of an injection mold 50 ′ for forming the primary molded product 10 ′.

  This injection mold 50 'includes a core side mold 52', a cavity side mold 54 ', a hot runner 56', and a valve pin 58 ', similar to the injection mold 50, but the core side mold. An uneven portion corresponding to the protruding portion 52c of the core-side mold 52 is formed in an upper part of the gate G on the mold dividing surface 52a ′ of the mold 52 ′ (an obliquely lower left part in FIG. 5B). This is different from the injection mold 50 in that it is not.

  In this injection mold 50 ′, the molten resin R flowing through the flow path P inside the hot runner 56 ′ joins so as to wrap around the valve pin 58 ′ in a bifurcated state, and the metal from the gate G Since it is injected into the inner space of the mold, a resin boundary surface B is generated at the merged portion of the molten resin R, and the molded product main body 12 is passed through the portion of the plate-like extension portion 14 ′ while maintaining the resin boundary surface B. The molten resin R will flow into the portion '.

  For this reason, in the mold inner space C, a heart-shaped flow mark F is generated in the molded product body 12 ′ due to the molten resin R flowing into the molded product body 12 ′. Molding defects such as line W and silver streak will occur.

  On the other hand, as shown in FIG. 2, the primary molded product 10 (injection molded product) according to the present embodiment is formed on the rear surface 14 a (first plate surface) of the plate-like extension portion 14 extending in a plate shape from the molded product body 12. Although the gate mark 14b is formed, a concave groove 14c (uneven portion) is formed between the formation position of the gate mark 14b in the plate-like extension 14 and the connection position with the molded product body 12. Therefore, as shown in FIG. 4, the injection mold 50 for molding the primary molded product 10 corresponds to the groove 14c in the portion of the plate-like extension 14 in the mold inner space C. The protrusion 52c having the shape is formed.

  Therefore, when the molten resin R flowing through the hot runner 56 joins the valve pin 58 so as to wrap around the valve pin 58 and is injected from the gate G into the mold inner space C, the molten resin R is injected into the mold. The smooth flow is disturbed by the ridges 52c formed in the plate-like extension portion 14 in the inner space C, resulting in a turbulent state, and thereby the resin boundary surface B (see FIG. 5) generated at the merged portion of the molten resin R. (See (b)) is physically destroyed.

  Then, the molten resin R stirred in such a turbulent state flows into the part of the molded product body 12, thereby generating a heart-shaped flow mark F in the molded product body 12 as in the past. Therefore, it is possible to prevent the occurrence of molding defects such as weld lines W and silver streaks due to this. Therefore, it is possible to effectively suppress the appearance defect from occurring in the molded product body 12.

  As described above, according to the present embodiment, in the primary molded product 10 including the plate-like extension portion 14 extending in a plate shape from the molded product main body 12, it is effective that the appearance defect occurs in the molded product main body 12. Can be suppressed.

  At that time, in the primary molded product 10 according to the present embodiment, the plate-like extension 14 is formed in a tongue-like shape, and the concave groove 14c is formed so as to cross the plate-like extension 14 over the entire width. Therefore, the molten resin R passing through the plate-like extension portion 14 can be efficiently stirred.

  Moreover, since the concave groove 14c is formed to extend in an arc shape around the position of the gate mark 14b, the molten resin R passing through the plate-like extension portion 14 can be more easily stirred. Become.

  Furthermore, in this embodiment, when the groove 14c is formed in the plate-like extension portion 14, when the molten resin R flows through the plate-like extension portion 14, the flow path is abruptly narrowed in the middle thereof. Therefore, the temperature of the molten resin R can be raised by shearing heat generation, whereby the resin boundary surface B can be remelted. Therefore, the resin boundary surface B that causes the generation of the heart-shaped flow mark can be thermally destroyed.

  At this time, since the concave groove 14c is formed on the rear surface 14a of the plate-like extension portion 14 like the gate mark 14b, it is possible to easily perform mold processing for forming the concave groove 14c.

  In the present embodiment, since the injection molded product is configured as the primary molded product 10 in the two-color molded product 100, the following operational effects can be obtained.

  That is, in the injection mold 50 for molding the primary molded product 10, it is highly necessary to use the hot runner 56 as in the present embodiment because of the space limitation as the mold structure. It is particularly effective to adopt a configuration like the primary molded product 10 according to the form.

  At this time, the two-color molded product 100 is composed of a primary molded product 10 made of a transparent resin and a secondary molded product 20 made of an opaque resin, and the plate-like extension 14 of the primary molded product 10. Since the secondary molded product 20 is laminated on the rear surface 14a, the gate mark 14b and the concave groove 14c can be made difficult to see when the completed two-color molded product 100 is observed.

  Further, in the two-color molded product 100, a concave groove formed in the plate-like extension 14 is formed by laminating the secondary molded product 20 on the rear surface 14 a of the plate-like extension 14 of the primary molded product 10. Since the opaque resin which comprises the secondary molded product 20 also enters into 14c, the reinforcement of the plate-shaped extension part 14 can be aimed at by this.

  In the said embodiment, although demonstrated as what the secondary molded product 20 was laminated | stacked over the whole area of the rear surface 14a with respect to the plate-shaped extension part 14 of the primary molded product 10, at least the part of the ditch | groove 14c was demonstrated. If they are stacked in the included region, the plate-like extension portion 14 can be reinforced.

  In the above-described embodiment, as the configuration of the two-color molded product 100, the front surface of the flange component portion 20 b of the secondary molded product 20 is substantially flush with the front surface of the plate-like extension portion 14 of the primary molded product 10. However, it is also possible to adopt a configuration in which a step is formed between the two.

  In the above-described embodiment, the two-color molded product 100 has been described as a translucent cover for a vehicle headlamp. However, the above-described implementation is also applicable to other resin molded products (for example, a sunroof and a rear window). The same effect as the form can be obtained.

  Next, a modification of the above embodiment will be described.

  First, a first modification of the above embodiment will be described.

  FIG.3 (b) is a figure similar to Fig.3 (a) which shows the principal part of the primary molded product 110 which concerns on this modification.

  Similar to the primary molded product 10 according to the above embodiment, the primary molded product 110 has a configuration in which a gate mark 114b is formed on the rear surface 114a of the plate-like extension 114 extending in a plate shape from the molded product main body 112. In addition, a concave groove 114 c is formed as a concave and convex portion between the formation position of the gate mark 114 b in the plate-like extension 114 and the connection position with the molded product body 112.

  The concave groove 114c has a V-shaped cross-sectional shape, similar to the concave groove 14c of the above embodiment, and crosses the plate-like extension 114 across the entire width on the rear surface 114a of the plate-like extension 114. Although it is formed, it is different from the above embodiment in that it is formed so as to extend linearly in parallel with the peripheral surface constituting portion 112a of the molded product body 112.

  Even when the configuration of this modification is adopted, when the primary molded product 110 is molded, the molten resin injected from the gate flows into the molded product main body 112 while being stirred in the concave groove 114c. Therefore, it is possible to effectively suppress the appearance defect from occurring in the molded product main body 112.

  Next, a second modification of the above embodiment will be described.

  FIG. 6A is a side sectional perspective view showing a main part of the primary molded product 210 according to this modification.

  Similar to the primary molded product 10 according to the above embodiment, the primary molded product 210 has a configuration in which a gate mark 214b is formed on the rear surface 214a of the plate-like extension 214 extending in a plate shape from the molded product main body 212. In addition, a plurality of conical holes 214 c as concave and convex portions are formed between the formation position of the gate mark 214 b in the plate-like extension 214 and the connection position with the molded product body 212.

  The plurality of conical holes 214c are formed at equal intervals in the horizontal direction on the rear surface 214a of the plate-like extension 214, and are formed in three rows in the vertical direction. At this time, the plurality of conical holes 214c are formed in a state shifted by a half pitch in the left-right direction between the columns adjacent in the up-down direction. Each conical hole 214c is formed so that the tip thereof extends to a position near the front surface of the plate-like extension 214.

  Even in the case of adopting the configuration of this modified example, when the primary molded product 210 is molded, the molten resin injected from the gate is agitated in the portions of the plurality of conical holes 214c to the molded product main body 212 portion. Since it will flow in, it can suppress effectively that the external appearance defect generate | occur | produces in the molded article main body 212. FIG.

  Next, a third modification of the above embodiment will be described.

  FIG. 6B is a side sectional perspective view showing the main part of the primary molded product 310 according to this modification.

  Similar to the primary molded product 10 according to the embodiment, the primary molded product 310 has a configuration in which a gate mark 314b is formed on the rear surface 314a of the plate-like extension 314 extending in a plate shape from the molded product main body 312. In addition, a corrugated portion 314 c as an uneven portion is formed between the formation position of the gate mark 314 b in the plate-like extension portion 314 and the connection position with the molded product body 312.

  The corrugated portion 314c has a corrugated cross-sectional shape so as to protrude forward in two steps from the general portion of the plate-like extension portion 314, and the plate-like extension portion 114 is linearly formed over the entire width. It is formed to cross. At this time, the corrugated portion 314c is formed such that the valley bottom on the rear surface 314a side of the plate-like extension portion 314 is located closer to the front side than the center position in the front-rear direction of the general portion of the plate-like extension portion 314.

  Even when the configuration of this modified example is adopted, when the primary molded product 310 is molded, the molten resin injected from the gate flows into the molded product main body 312 while being stirred in the wavy portion 314c. Therefore, it is possible to effectively suppress the appearance defect from occurring in the molded product main body 312.

  Next, the 4th modification of the said embodiment is demonstrated.

  FIG.6 (c) is a side cross-sectional perspective view which shows the principal part of the primary molded product 410 which concerns on this modification.

  Similar to the primary molded product 10 according to the embodiment, the primary molded product 410 has a configuration in which a gate mark 414b is formed on the rear surface 414a of the plate-like extension 414 extending in a plate shape from the molded product main body 412. A stepped portion 414c as an uneven portion is formed between the formation position of the gate mark 414b in the plate-like extension portion 414 and the connection position with the molded product body 412.

  The stepped portion 414c is formed so that the distal end side region of the plate-like extension portion 414 is offset to the front side by a dimension close to the thickness of the plate-like extension portion 414 with respect to the proximal end side region. As a result, the stepped portion 414c of the plate-like extension portion 414 is narrower than other general portions.

  Even when the configuration of this modified example is adopted, when the primary molded product 410 is molded, the molten resin injected from the gate flows into the molded product main body 412 while being stirred in the stepped portion 414c. Therefore, it is possible to effectively suppress the appearance defect from occurring in the molded product body 412.

  In addition, the numerical value shown as a specification in the said embodiment and its modification is only an example, and of course, you may set these to a different value suitably.

  The invention of the present application is not limited to the configuration described in the above-described embodiment and its modifications, and a configuration with various other changes can be adopted.

10, 110, 210, 310, 410 Primary molded product (injection molded product)
12, 112, 212, 312, 412 Molded product body 12a, 20a, 112a Peripheral surface constituent parts 14, 114, 214, 314, 414 Plate-like extension parts 14a, 114a, 214a, 314a, 414a Rear surface (first plate surface)
14b, 114b, 214b, 314b, 414b Gate mark 14c, 114c Concave groove (uneven portion)
20 Secondary Molded Product 20b Flange Component 20c Leg 50 Injection Mold 52 Core Side Mold 52a Mold Dividing Surface 52c Projection 54 Cavity Side Mold 56 Hot Runner 58 Valve Pin 100 Two Color Molded Product 100A Front Part 100B Peripheral surface portion 100C Flange portion 214c Conical hole (uneven portion)
314c Wavy (uneven portion)
414c Stepped portion (uneven portion)
B Resin interface C Internal space F Flow mark G Gate P Flow path R Molten resin W Weld line

Claims (4)

In an injection molded product comprising a molded product body and a plate-like extension extending in a plate shape from the molded product body,
Gate marks are formed on the first plate surface of the plate-like extension,
An injection-molded product, wherein an uneven portion is formed between a position where the gate mark is formed in the plate-like extension and a connection position between the molded product body.   The injection-molded article according to claim 1, wherein the uneven portion is formed so as to traverse the plate-like extension across the entire width.   The injection-molded article according to claim 2, wherein the concavo-convex portion is constituted by a concave groove formed in the first plate surface. The injection molded product is configured as the primary molded product in a two-color molded product composed of a primary molded product made of transparent resin and a secondary molded product made of opaque resin,
The injection molded product according to claim 3, wherein the primary molded product is configured such that the secondary molded product can be laminated on the first plate surface of the primary molded product.

Images