JPH08192458A - Molding of blow molded product integrated with other part and obtained blow molded product - Google Patents

Abstract

PURPOSE: To integrally mold a blow molded product and other part simultaneously with blow molding by arranging a mold and a clamping mold side by side and inserting other part having an adhesive or an appropriate slip-off preventing structure applied to the outer periphery thereof in a parison from the end thereof and pressing and clamping the parison to the outer periphery of the other part to blow air in the parison. CONSTITUTION: A mold 14 and a clamping mold 16 are opened and a parison 18 is inserted in the space between both molds 14, 16. Next, the mold 14 is clamped to close the opening of the parison 18. At the time of the completion of closing, a needle 20 is inserted in the parison 18 and air is blown in the parison 18 to expand the same to a certain degree. Other part 12 is inserted in the parison 18 so as to tuck in the parison until it enters the clamping mold 16. After the other part 12 is inserted in the parison 18 from the end thereof, the parison 18 is pressed to the outer periphery of the other part 12 to be perfectly integrated with the other part 12 by the adhesive or the slip-off preventing structure. Finally, air is blown in the parison 18 to obtain a molded product 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for molding a blow-molded product integrated with other parts and a blow-molded product molded by the method.

[0002]

2. Description of the Related Art Blow molding is often used for molding resin-made ducts because it is relatively easy to mold even complicated shapes. By the way, ducts are often used by being fitted (connected) to other parts. Therefore, the fitting portion is required to have a sealing property. For this reason, a method is also used in which a soft resin is partially supplied to the fitting parison.

However, such a method is technically difficult, and even if such a method is possible, it cannot be denied that the soft resin is inferior in heat resistance, durability, etc., and is as elastic as rubber. Can't expect. For this reason, generally, as shown in the cross-sectional view of FIG. 4, a method of fitting a rubber grommet B to the blow-molded product A is performed.

[0004]

However, in order to do so, the fitting portion is required to have a high precision, and the fitting portion of the blow-molded product A needs to be subjected to an inner diameter cutting process or the like. It is also necessary to provide a bellows portion C on the way in order to give the blow molded product A a predetermined elasticity.

Therefore, in addition to the processing man-hours, the fitting operation takes time due to the tight fitting, and the cost cannot be reduced. Further, the blow molded product itself is required to have a complicated shape. The present invention solves such a problem, and makes it possible to integrate other components simultaneously with blow molding.

[0006]

Under the above problems, the present invention is characterized by being molded through the following steps (a) to (f), and is a blow molded product integrated with other parts. And a blow-molded product integrated with other parts molded by this molding method. (A) A clamping die is arranged next to the molding die, and the parison is introduced into the molding die and the clamping die from the molding die side. (B) The mold is clamped and the parison is closed. (C) Blow the parison to some extent by blowing air into the parison. (D) The other component to be integrated, which is coated with an adhesive or has an appropriate retaining structure on the outer periphery, is inserted by folding the parison from the end of the parison until at least the other component fits into the mold. (E) Clamp the clamping die and press the parison against the outer periphery of other parts. (F) Air is blown into the parison to mold the parison into a blow-molded product having the shape of a molding die.

[0007]

By adopting the above means, the blow molded product and other parts can be integrated at the same time as the blow molding. In this case, the number of molding steps is not significantly increased, and, of course, the blow molding product does not require inner diameter cutting.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 is a cross-sectional view showing an example of a blow-molded product integrated with another component molded by carrying out the present invention. In this example, a blow-molded product 10 is a medium expansion duct, and another component 12 is a blow-molded product. As an example, a rubber sleeve fitted into one end of the blow-molded product 10 is used.

FIG. 1 is an explanatory view showing a molding method according to the present invention. The molding method of the present invention is carried out through the following steps. First, a molding die 14 for molding a parison into a predetermined shape.
The mold 16 is arranged side by side, the mold 14 and the mold 16 are opened, and the parison 18 is advanced from the mold 14 into the mold 14 and the mold 16 (a).

Next, the molding die 14 is clamped to form the parison 1.
Close the mouth of No. 8 (b). In this case, the mold 14 may not be completely clamped depending on the shape of the molded product. In that case, the mold is clamped within the range that can be clamped. However, since mouth closing is necessary, it is conceivable to use another mold for mouth closing in this case.

When the closing of the mouth of the parison 18 is completed, the needle 20 having an air injection passage is inserted into the parison 18 from this portion, and air is blown from this to inflate the parison 18 to some extent (c). This is for allowing the other component 12 to be inserted in the next step, and in this sense, the amount of expansion is at least the other component 1.
It is necessary that 2 can be inserted.

The other component 12 is inserted by folding the parison 18 inward from the end of the parison 18 at least until the other component 12 is sufficiently inserted into the mold 16 (d). At this time, an adhesive is applied to the outer periphery of the other component 12 or an appropriate retaining structure which will be described later is provided. This is because the blow molded product 10 is completely integrated.

By the way, if the other component 12 has a sleeve shape as shown in the drawing, the parison 18 may get inside when it is inserted. Therefore, it is preferable to close the tip as shown in the drawing. Alternatively, a mandrel may be inserted inside the other component 12 instead.

When the other component 12 is inserted from the end of the parison 18, the clamping die 16 is clamped to fix the parison 18 to the other component 1.
Press on the outer circumference of 2 (e). As a result, the parison 18 is completely integrated with the other component 12 by the adhesive or the retaining structure. Finally, air is blown into the parison 18 again from the needle 20 to mold the parison 18 into the blow-molded product 10 in the shape of the molding die 14 (f).

In the above description, each process is described separately.
Each process does not have to be performed in stages. For example, the pre-blowing process of inflating the parison 18 to some extent and the inserting process of the other component 12, and this process and the mold clamping process of the clamping mold 16 are partially overlapped, and the clamping process of the clamping mold 16 and the full blow process are performed at the same time. It goes without saying that a method of shortening the molding time as much as possible is adopted.

After the above steps are completed, the molding of the blow-molded product 10 and the integration with the other component 12 are completed. Therefore, the molding die 14 and the clamping die 16 are opened, and the other component 12 inside. The blow-molded product 10 integrated with is taken out.
It should be noted that necessary post-treatments such as removal of the wall portion inside the blow-molded article 10 which impedes the penetration and cutting of the end portion remain.

FIG. 2 is a sectional view of an essential part showing an integrated structure of the blow-molded product 10 and the other component 12. According to the above method, for example, an annular projection or the like is retained on the outer periphery of the other component 12. It is also possible to apply the structure 22. Therefore, a stronger integration can be achieved by using the adhesive together, and the other component 12 can be made of a metal or the like that is difficult to adhere to the resin.

[0018]

As is apparent from the above description, according to the present invention, the blow-molded product and the other component can be integrated together with the blow molding. Therefore, the inner diameter cutting of the blow-molded product and the number of assembling steps for assembling with other parts are not necessary, and the manufacturing cost can be reduced. Further, there is no need for a shape for imparting elasticity to the blow-molded product, and there is an advantage that the entire shape can be simplified. Further, the mating member integrated with the blow-molded product can be made of resin, rubber, inorganic material, metal or the like.

[Brief description of drawings]

FIG. 1 is an explanatory view of a method for molding a blow-molded product integrated with another component according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of an integrated structure of another component and a blow-molded product showing an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a blow-molded product integrated with another component according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view of a blow-molded product integrated with another component showing a conventional method.

[Explanation of symbols]

 10 Blow Molded Product 12 Other Parts 14 Molding Die 16 Clamping Die 18 Parison 22 Stopping Structure

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Claims (2)

[Claims] 1. A method of molding a blow-molded product integrated with another component, which is molded through the following steps (a) to (f). (A) A clamping die is arranged next to the molding die, and the parison is introduced into the molding die and the clamping die from the molding die side. (B) The mold is clamped and the parison is closed. (C) Blow the parison to some extent by blowing air into the parison. (D) The other component to be integrated, which is coated with an adhesive or has an appropriate retaining structure on the outer periphery, is inserted by folding the parison from the end of the parison until at least the other component fits into the mold. (E) Clamp the clamping die and press the parison against the outer periphery of other parts. (F) Air is blown into the parison to mold the parison into a blow-molded product having the shape of a molding die. 2. A blow-molded product integrated with another component molded by the molding method according to claim 1.