JP4867817B2 - Injection insert molding - Google Patents

Description

  The present invention relates to an injection insert molded article.

  Conventionally, a weld line and a flow mark are easily generated in an injection molded product, and the weld line and the flow mark are exposed on the outer surface of the injection molded product, so that the appearance is poor and the commercial value is lowered.

  For example, in the case of forming a gutter part attached to the longitudinal end of an eave ridge called “stop 4a” as shown in FIG. 6B by injection molding, generally, FIG. Thus, the two stops 4a are simultaneously injection molded. In this case, the runner 20 is positioned between the side piece portions 7 of the adjacent stops 4a. For this reason, the molten synthetic resin supplied to the portion for molding the side piece portion 7 of the cavity of the injection mold. Flows along the part forming the side piece 7 having the ear 15 for stopping at the upper end, and further flows to the part forming the front piece 5 by changing the direction. If the direction is changed many times, a weld line as indicated by A in FIG. 6A is generated, and the commercial value is lowered.

  On the other hand, in the injection molding, the film material is set in the cavity of the injection mold, the molten synthetic resin is injected into the cavity, and the film material and the core portion made of the injection resin are integrated to perform injection insert molding. A film insert molding for molding a product is known from Patent Document 1 and the like.

In this patent document 1, the film material becomes the outer surface of an injection insert molded product, and even if a weld line or a flow mark is generated by injection molding, the weld line or the flow mark can be prevented from being exposed to the outer surface. The film material is extremely thin in the three-dimensional direction, and there is a problem that it is impossible to form an injection insert molded article having a complicated shape and rich in three-dimensionality.
JP 2002-219733 A

  The present invention was invented in view of the above-described conventional problems, and has an object to provide a three-dimensional injection insert molded product that has a simple configuration and does not expose a weld line or a flow mark on the outer surface. It is what.

In order to solve the above problems, an injection insert molded product according to the present invention is an injection insert in which a bottom piece 6 protrudes from a lower end edge of a front piece 5 and a side piece 7 protrudes from both side edges of the front piece 5. A molded product, the outer shape part 1 constituting the outer surface of each of the front piece part 5, the bottom piece part 6 and the both side piece parts 7, and the front piece part 5 and the bottom piece laminated on the inner surface of the outer shape part 1 The outer part 1 and the core part 3 have a two-layer structure by being composed of the part 6 and the core part 3 constituting the inner surfaces of the both side piece parts 7, and the outer part 1 is blow-molded. One of two outer parts obtained by dividing the product into two parts, and the core part 3 injects a molten synthetic resin into an injection mold 2 in which the one outer part 1 is set. It consists of the injection resin integrated with the said outer shape part 1 , It is characterized by the above-mentioned.

  By adopting such a configuration, the injection insert molded product 4 of the present invention is composed of the outer portion 1 whose outer surface is formed by blow molding, and even if a weld line or flow mark is generated by injection molding, Therefore, it is possible to provide an injection insert molded product 4 in which the weld line and the flow mark are not exposed on the outer surface, and the core part 3 injection-molded is integrated with the outer shape part 1 formed by blow molding. Therefore, the outer portion 1 formed by blow molding can be reinforced by the core portion 3.

  As described above, the present invention includes an outer portion formed by blow molding, and a core portion made of the outer portion and the injection resin by injecting a molten synthetic resin into an injection mold in which the outer portion is set. Since it is constructed as a single unit, the weld line and flow mark are not exposed on the outer surface of the injection insert molded product, the appearance is good and the product value is high, and the core formed by injection molding on the outer part formed by blow molding Since the material parts are integrated, the outer shape part formed by blow molding is reinforced by the core material part, and an injection insert molded product having high strength and good appearance can be provided.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

  FIG. 1 shows a gutter part called “stop” which is an example of an injection insert molded product 4 of the present invention.

  The injection insert molded product 4 (stop 4a) of the present invention is composed of an outer portion 1 which is an outer surface exposed to the outside and a core portion 3 which is integrally injection-molded on the inner surface side of the outer portion 1. It has a layer structure.

  The stop 4a is formed by integrally projecting the bottom piece 6 and the left and right side pieces 7 from the lower end edge and the left and right side edges of the front piece 5 at right angles to the front piece 5 respectively. The side piece 7 is continuous in a U-shape, and a stop ear 15 is integrally formed at the upper end of each of the left and right side pieces 7.

  This stop 4a is used as follows. The bottom end 6 of the stop 4a and the left and right side pieces 7 are fitted into the U-shaped portion where the longitudinal end of the eaves ridge is fitted, and provided at the upper end of both ends of the eaves to the stop ear 15 The edge part of the ear part in the longitudinal direction is fitted and adhered with an adhesive, so that the stop 4a is attached to the longitudinal end part of the eaves bowl, and the longitudinal end part of the eaves bowl is shielded and water flows out. Do not.

  In the present invention, the outer portion 1 which is a portion exposed to the outside of the stop 4a is formed by blow molding, and the outer portion 1 formed by blow molding is formed in the injection mold 2 as shown in FIG. Set in the cavity 2a, inject the molten synthetic resin into the cavity 2a and integrate the outer part 1 and the core part 3 made of the injection resin, thereby forming the stop 4a of the present invention which is the injection insert molded product 4. is doing.

  The outer portion 1 is formed by blow molding, but in the case of the above-described stop 4a, the blow-molded product 8 formed by blow molding is divided into two and processed to form two outer portions 1. Yes.

  FIG. 4 is a schematic explanatory view showing the molding order of blow molding. That is, as shown in FIG. 4 (a), the parison 11 is put into the blow-molded mold 10 opened with the blow-molded mold 10 opened, and then, as shown in FIG. 4 (b), The blow molding die 10 is clamped, and air is blown to inflate the parison 11 so as to conform to the inner surface of the blow molding die 10. Next, as shown in FIG. 10 is opened, and then the blow molded product 8 is taken out.

  Here, in the present invention, the blow-molded product 8 molded in the order as shown in FIG. 4 is a blow-molded product 8 as shown in FIG. A blow molded product 8 in which the outer shape portion 1 is continuous by the continuous portion 12 is formed.

  The blow molded article 8 as shown in FIG. 3 in which the two external parts 1 are continuous by the continuous part 12 is cut and divided into two parts at the continuous part 12 part (in FIG. 3, it is divided into two parts left and right). 2) and forming the two outer shape portions 1 and removing the extra portion 13 around the outer shape portion 1 cut and divided to form two outer shape portions 1 as shown in FIG. In the embodiment, the outer shape portion 1 formed in this way has the same shape as the outer shape of the stop 4 a to be finally formed, and the front outer shape piece portion 5 ′ that becomes the outer surface portion of the front piece portion 5. Bottom outer shape piece 6 ′ serving as the outer surface portion of the bottom piece 6, both side surface outer shape pieces 7 ′ serving as the outer surface portion of the both side surface piece portions 7, and stopping ear outer shape portion 15 ′ serving as the outer surface portion of the stopping ear portion 15 Is integrated.

  The outer portion 1 made of the blow molded product obtained as described above is set in the cavity 2a of the injection mold 2 as shown in FIG. 5, the molten synthetic resin is injected into the cavity 2a, and the blow molding is performed. The core part 3 formed by blow molding and the core material made of injection resin are integrally laminated with the core part 3 made of injection resin formed by solidifying molten synthetic resin on the inner surface side of the formed outer shape part 1. A stop 4a which is an injection insert molded product 4 integrated with the portion 3 is formed.

  A stop 4a, which is an injection insert molded product 4 molded as described above, is composed of an outer portion 1 whose outer surface is formed by blow molding, and even if a weld line or a flow mark is produced by injection molding, the core portion 3 The weld line and the flow mark are not exposed on the outer surface of the stop 4a which is the injection insert molded product 4. Therefore, the injection insert molded product 4 of the present invention has an excellent appearance in which weld lines and flow marks are not exposed on the outer surface.

  In addition, since the outer portion 1 which is a member to be inserted in the present invention is made of a blow molded product, even if the film is extremely thin and has a complicated shape with a rich three-dimensional effect, it is easy and reliable by blow molding. Therefore, it is possible to form not only the stop 4a as shown in the attached drawings but also the outer shape portion 1 of the injection insert molded product 4 having a complicated shape rich in various other three-dimensional effects.

  Further, in the injection insert molded product 4 of the present invention, since the core part 3 formed by injection molding is integrated with the outer part 1 formed by blow molding, the outer part 1 formed by blow molding is reinforced by the core part 3. it can.

  Here, if the core part 3 integrally formed by injection molding on the inner surface side of the outer shape part 1 made of a blow molded product is a material that is in close contact with the outer shape part 1 made of a blow molded product, the synthetic resin used There is no limitation on the type.

  Moreover, various patterns and coloring may be given to the outer shape part 1 formed by blow molding, and when performing the injection insert molding, the outer shape part 1 having a different pattern or color is selected and the injection mold 2 By setting in the cavity 2a and injection molding, it is possible to easily obtain an injection insert molded product 4 having a different pattern and color on the outer surface.

The stop which is the injection insert molded product of this invention is shown, (a) is a perspective view, (b) is sectional drawing of the XX line of (a). It is a perspective view of the external shape shape | molded by the blow molding used for the same as the above. It is a side view of a blow molded product same as the above. (A) (b) (c) is a schematic explanatory drawing which shows the order of blow molding same as the above. It is sectional drawing of the state which set the external part formed by blow molding to the injection mold same as the above. (A) is explanatory drawing explaining that a weld line will generate | occur | produce when a stop is shape | molded by the conventional injection molding, (b) is a perspective view of the conventional stop.

Explanation of symbols

1 Outer part 2 Injection mold 3 Core material part

Claims (1)

An injection insert molded product that projects a bottom piece from a lower edge of a front piece and a side piece from both side edges of the front piece, each of the front piece, the bottom piece, and both side pieces. The outer shape portion is constituted by an outer shape portion constituting an outer surface and a core portion laminated on the inner surface of the outer shape portion and constituting the inner surfaces of the front piece portion, the bottom piece portion, and both side piece portions. And the core part is composed of one of two outer parts obtained by dividing the blow molded product into two parts, and the core part is set with the one outer part. injection insert molding that by injecting molten synthetic resin into the injection mold, characterized in that consists of injected resin integrated with the outer portions.

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