JP2008023948A - Composite molded article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composite molded article which causes no warp as a whole even when a soft member having a predetermined thickness is integrally bonded to a rigid resin-made plate-like member having a predetermined thickness and a predetermined surface area such as an airtight piece. <P>SOLUTION: The composite molded article comprising the rigid resin-made plate-like member and the soft member bonded to the most part of the surface of the plate-like member is characterized in that the soft member is formed substantially discontinuously in the direction of the plane. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a composite molded article such as an air-tight piece for an aluminum sash window frame made of a hard resin and a soft resin.

  Conventionally, as an airtight piece for an aluminum sash window frame, one having a shape as shown in an overall perspective view of FIG. 4 is known. The airtight piece 100 is provided on a plate-like member 1 (holding member) having a substantially rectangular plane made of a hard resin such as polypropylene, a fixing member 4 integrally formed on both short sides thereof, and a surface of the plate-like member 1. The swing member 2 is made of a soft resin such as an elastomer, and the swing member 2 is a plate-like member as shown in FIG. 5 which is a partial cross-sectional view taken along the line XX of FIG. The base layer 2a is integrally fused and bonded to the surface of the base plate 1 and a plurality of fins 2b rising from the base layer 2a.

  The airtight piece 100 is used as an airtight piece for an aluminum sash window frame as shown in FIG. For example, as shown in FIG. 8, it is fixed to the upper inner side of the fixed frame 6 by the fixing member 4, seals a gap that inevitably occurs between the inner side of the fixed frame 6 and the upper part of the movable frame 7, and is partitioned by a sash window. Used to block warm and cold air indoors and outdoors.

  As shown in FIG. 5, the airtight piece has a large number of fins 2b integrally joined to the plate member 1 via a base layer 2a. The fin 2b is formed integrally with the base layer 2a so that the fin 2b does not easily peel off, and the base layer 2a covers almost the entire surface of the plate-like member 1.

  In the conventional airtight piece 100, the thickness of the plate-like member 1 cannot be made so structurally and in design, and the bonding strength of the fin 2b to the plate-like member 1 is maintained unless the base layer 2a is provided. Since it cannot be performed, it is necessary to form it to some extent.

  From the above, the problem that the airtight piece composed of the plate-like member 1 and the soft member 2 warps to the soft member 2 side due to the difference in molding order and shrinkage between the two members as shown in FIG. There is. When such warpage occurs, there is a problem that fixing of the airtight piece to the window frame becomes complicated, and airtightness due to the airtight piece is impaired.

  Therefore, the object of the present invention is to generate warpage as a whole even if a soft member having a certain thickness is integrally joined to a plate-like member made of a hard resin having a certain thickness and area, such as an airtight piece. It is to provide a composite molded product such as an airtight piece that does not.

  The above object is achieved by the present invention described below. That is, the present invention provides a composite molded article comprising a plate-like member 1 made of a hard resin and a soft member 2 fused to the majority of the surface, and the soft member 2 is substantially in the plane direction. A composite molded article characterized by being formed discontinuously is provided.

  In the present invention, the soft member 2 includes the base layer 2a covering most of the surface of the plate-like member 1 and the fins 2b rising from the base layer 2a, and the base layer 2a is a flat surface thereof. The plate member 1 is a holding member, the fin 2b of the soft member 2 is a swing member, and is an airtight piece for an aluminum sash window frame. preferable.

  According to the present invention, a soft member is joined substantially discontinuously to a plate-like member 1 made of a hard resin having a constant thickness and area, such as an airtight piece. By reducing the shrinkage stress of 2, it is possible to provide a composite molded article such as an airtight piece that does not warp as a whole.

  Next, the present invention will be described in more detail by taking a hermetic piece for an aluminum sash window frame which is a preferred embodiment as a representative example. The air-tight piece for an aluminum sash window frame of the present invention comprises a plate-like member 1 made of a hard resin and a soft member 2 fused to the most part of the surface, as shown in FIG. The soft member 2 is formed substantially discontinuously in the planar direction, that is, the groove 3 is formed in the soft member 2.

  The plate-like member 1 shown in FIG. 1 is generally formed in a rectangular shape having a thickness of about 3 to 5 mm and an area of 40 to 60 mm (long side) × 20 to 30 mm (short side). These dimensions are not limited to the above range because they vary depending on the size of the aluminum sash window frame to which the airtight piece 100 is applied. A fixing member 4 for fixing the airtight piece 100 to the window frame is integrally provided on both short sides of the plate member 1.

  On one surface of the plate-like member 1, that is, the surface facing the upper portion of the movable frame 7 (see FIGS. 7 and 8) of the aluminum sash window frame, a base layer 2a having a large number of fins 2b is made of a soft material such as an elastomer. It is integrally formed from resin. The base layer 2a covers most of the area of the plate-like member 1, for example, 90% or more, and its thickness is generally 0.5 to 1.5 mm, but is not limited to this range.

  The thickness of the fin 2b rising substantially vertically from the base layer 2a is 0.2 to 1.0 mm, the height is 4 to 10 mm, and the number is about 7 to 15. These various sizes are not limited to the above range because they vary depending on the size of the aluminum sash window frame to which the airtight piece 100 is applied. The fins 2b are slid in contact with the upper part of the movable frame 7 of the aluminum sash window frame to make the inside and outside of the aluminum sash window airtight. In order to reduce the peristaltic resistance during the contact peristaltic movement, it is preferable that about 1 to 2 cutting lines 5 are provided in the fin 2b.

  The feature of the present invention is that, as shown in FIGS. 1 and 2, the base layer 2a is provided with discontinuous portions (grooves) 3 to make the base layer 2a discontinuous as a whole, thereby reducing the shrinkage stress of the base layer 2a. The warpage of the plate-like member 1 is prevented. In FIGS. 1 and 2, the grooves 3 are provided between the two fins 2b in parallel to the fins 2b at every other interval between the two fins 2b. 3 is not limited. For example, it is sufficient that at least one strip is provided at the center of the base layer 2a. The number of the grooves 3 can be approximately 1 to 10 according to the area of the plate-like member 1, particularly the length of the long side thereof. Further, the groove 3 is preferably provided in parallel to the short side direction of the plate-like member 1, but is provided in parallel to the long side direction of the plate-like member 1 or provided with an angle on the long side or short side. May be. From the viewpoint of ease of design, it is preferable to provide parallel to the short side of the plate-like member 1.

  Moreover, the width | variety of the groove | channel 3 shown to FIGS. 1-2 is arbitrary, The width | variety is 0 mm, ie, the notch | incision provided in the base layer 2a may be sufficient. The width of the groove 3 may be a width that allows the base layer 2a to remain about 0.5 mm on both sides of the fin 2b. If the width of the base layer 2a on both sides of the fin 2b is too narrow, the adhesion of the fin 2b to the plate-like member 1 may be reduced. Although it is not impossible to provide such a groove 3 after molding the airtight piece 100, it is preferable to design a molding die so that the groove 3 is formed simultaneously with the molding. Further, when the groove 3 is formed at the same time as the molding, the base layer 2a contracts even if a thin soft resin layer (not shown) that may occur in the molding exists at the bottom of the groove 3 in FIG. Since the purpose of stress distribution is achieved, the groove 3 is not completely formed as described above, and even when the base layer 2a is connected by a thin layer at the portion of the groove 3, in the present invention, “substantially Is discontinuous ”.

  FIG. 3 is a diagram for explaining another embodiment of the present invention. In the embodiment shown in FIG. 3, when the plate-like member 1 is formed, a protrusion 3 ′ is formed in a portion corresponding to the groove 3 of the base layer 2 a to be formed later, and the base layer 2 a of the protrusion 3 ′ is formed. In the embodiment, the thickness is reduced to block the shrinkage stress of the base layer 2a. In this embodiment, the thin base layer 2a is also formed on the top of the ridge 3 '. However, since the contraction stress of the entire base layer is substantially blocked in the thin base layer 2a, the effect of the present invention is achieved. Can do. Therefore, in the embodiment shown in FIG. 3, the base layer 2a can be said to be “substantially discontinuous”.

  Next, the manufacturing method of the airtight piece of this invention is demonstrated. The airtight piece of the present invention can be produced by a conventionally known method. For example, it can be manufactured by insert molding and two-color molding. The molding conditions are not particularly limited. For example, the molding conditions are the same as those of conventional general insert molding and two-color molding described in “Recent injection molding technology—its practice and application” (Sanko Publishing Co., Ltd.). .

  As described above, the present invention has been described with the configuration of an airtight piece for an aluminum sash window frame. However, the present invention is not limited to the illustrated example, and is fused to a plate-like member made of a hard resin and most of its surface. Of course, the present invention can also be applied to a composite molded product made of a soft member, which warps due to the difference in shrinkage between the two members.

  As hard resin used by this invention, a polypropylene, a polystyrene, a polycarbonate, polyester, polyamide etc. can be used, for example. Polypropylene is preferred, and any polypropylene conventionally used for producing molded articles and the like is useful in the present invention.

  In addition, the soft resin used in the present invention includes an elastomer, and a thermoplastic elastomer can be preferably used. For example, polystyrene (S) -polybutadiene (B) (or polyisoprene (I))-polystyrene (S) block copolymer (referred to as SBS, SIS) and hydrogenated products of these conjugated dienes (hydrogenated products of SBS) Is called polystyrene-based thermoplastic elastomer such as SEBS (polystyrene-poly (ethylene-butylene) -polystyrene block copolymer)); polyolefin rubber (mainly partially or fully crosslinked EPR, EPDM) as soft segment and hard segment Polyolefin-based resins (mainly PP), polyolefin-based thermoplastic elastomers such as blends of PP and EPR and / or EPDM; polyester-based and polyurethane-based block copolymers, etc. Luo is a material that can be obtained from any market.

Next, the present invention will be described more specifically with reference to examples.
[Example 1]
The airtight piece 100 shown in FIG. 1 was created. The size of each part of the airtight piece 100 is as follows. The plate-like member 1 has a thickness of 3 mm, an area of 52 mm × 26 mm, and a fixing member 4 having a thickness of 1 mm is integrally formed on both short sides thereof in the shape shown in the drawing. The base layer 2a covers the entire surface of the plate-like member 1 except for the grooves 3, and has a thickness of 1 mm. The eleven fins 2b have a thickness of 0.6 mm and a height of 6 mm. One groove 3 having a width of 0.5 mm is provided at the center of the base layer 2a.

  A DC100-200 two-color molding machine (manufactured by Nissei Plastic Industry Co., Ltd.) was used as an injection molding machine having a mold corresponding to the hard member, and an airtight piece of the above size was created by a two-color molding method. Using a polypropylene resin colored in black as the hard resin, the holding member 1 and the fixing member 4 are integrally molded under the conditions of a resin melting temperature of 200 ° C. to 230 ° C. and a mold temperature of 50 ° C. After changing the mold, a soft member was molded under the condition of a resin melting temperature of 180 ° C. to 240 ° C. using SEBS colored by black (trade name Tuftec, manufactured by Asahi Kasei Co., Ltd., thermoplastic elastomer), as shown in FIG. Made an airtight piece. Even when the airtight piece was left for a long time, the warpage of the plate-like member 1 did not occur. On the other hand, the same airtight piece as described above was warped after being left for 24 hours except that no groove was formed.

  According to the present invention, a soft member is joined substantially discontinuously to a plate-like member 1 made of a hard resin having a constant thickness and area, such as an airtight piece. By reducing the shrinkage stress of 2, it is possible to provide a composite molded article such as an airtight piece that does not warp as a whole.

It is a whole perspective view of the airtight piece of the present invention. It is a broken-line XX arrow sectional drawing of FIG. It is a figure explaining another Example of this invention. It is a whole perspective view of the conventional airtight piece. It is a broken line XX arrow sectional drawing of FIG. It is a figure explaining the airtight piece which warped. It is a figure explaining an aluminum sash. It is a figure explaining the state which attached the airtight piece to the aluminum sash fixed frame.

Explanation of symbols

1: plate-like member 2: soft member 2a: base layer 2b: fin 3: groove 3 ': ridge 4: fixed member 5: cutting line 6: fixed frame 7: movable frame 100: airtight piece

Claims (3)

  In a composite molded article comprising a plate-like member (1) made of a hard resin and a soft member (2) fused to most of the surface, the soft member (2) is substantially in the plane direction. A composite molded product characterized by being formed discontinuously.   The soft member (2) is composed of a base layer (2a) covering most of the surface of the plate-like member (1) and fins (2b) rising from the base layer (2a). The composite molded article according to claim 1, wherein (2a) is formed substantially discontinuously in the planar direction. The composite molded product according to claim 2, wherein the plate-like member (1) is a holding member, the fin (2b) of the soft member (2) is a sliding member, and is an airtight piece for an aluminum sash window frame.

Images