JPH07102586B2 - Method for manufacturing partially cloth-attached injection-molded article - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing a partially cloth-bonded injection-molded article in which cloth such as woven cloth or non-woven cloth is partially stuck to the surface of a resin molded article.

[Conventional technology]

2. Description of the Related Art In recent years, there is an increasing demand for improving the appearance by attaching a cloth such as a woven cloth or a non-woven cloth to the exterior part of the outfitting parts of a vehicle to decorate it and to give a high-class feeling.

Therefore, for example, "Nissan Laurel Catalog No. 4101AK
As seen in "K" (issued by Nissan Motor Co., Ltd. in October 1984), the hair is planted on the core material of the front pillar, or the cloth is partially attached to the injection molded product such as the rear parcel side to color it. Attempts have been made to make the appearance different by changing the pattern.

As a method for producing a partially cloth-attached injection-molded article in which cloths are partially stuck, as described in, for example, JP-A-60-48324, a thin wall provided in a vacuum forming mold is used. Laying a cloth on the surface of the vacuum forming mold in the predetermined area formed by step 1, placing a resin plate on top of it, and applying the cloth to the surface of the resin plate by vacuum forming, or by directly attaching the cloth to the resin molded product There is a method such as sticking to the surface of.

[Problems to be solved by the invention]

However, such a conventional method for producing a partially cloth-attached injection-molded article has a problem that the production cost increases because the number of production steps increases in any case.

Therefore, the cloth for decoration prepared in advance is temporarily attached to the mold surface of the injection molding die corresponding to the portion to which the cloth of the resin molded product is attached, by using the double-sided tape or the magnet, and then the molten resin is molded. A method of manufacturing a partially cloth-attached injection-molded article at a low cost by injecting into the inside is also conceivable, but there is a concern that the cloth may be displaced due to the injection pressure when the resin is injected.
I was struggling with that measure. Further, there is a problem that the resin oozes out on the surface of the cloth and the cut line at the end portion of the cloth sticking meanders to impair the appearance.

The present invention aims to solve such problems.

[Means for solving problems]

Therefore, in the method for manufacturing a partially cloth-attached injection-molded product according to the present invention, the second mold is arranged so as to face the first mold, and the first mold and the second mold are separated from each other. A slide core adjacent to the second mold is disposed so as to be interposed between the pair of molds, and the second mold projects into the molding space at the end on the slide core side. A ridge is provided, and the cloth is inserted and held between the pair of molds after applying a backing material for preventing the resin from permeating on the back surface of the cloth, and the pair of molds are brought closer to each other to make the resin A first molding space of a portion of the molded article to which the cloth is attached is formed, and a portion of the molded article to which the cloth is not attached is closely sandwiched by the second mold and the slide core, and the first
Forming a second molding space in a portion of the resin molded product where the cloth is not attached between the mold and the slide core, and forming the first molding space between the pair of mold and the slide core.
The above object is achieved by injecting the molten resin into the molding space and the second molding space to perform resin molding.

[Action]

A first molding space of a portion for inserting cloths between a pair of molds including a first mold and a second mold, and then bringing the molds close to each other to attach the cloths to the resin molded product. To form
The second die and the slide core tightly sandwich the portion of the cloth which is not adhered, and form a second molding space of the portion where the cloth is not adhered between the slide core and the first die. Then, by injecting a molten resin there and performing resin molding, in the first molding space of the portion where the cloth is stuck, the cloth is pasted on the surface of the resin and molded, and the portion where the cloth is not stuck is molded. Since the second molding space is molded only with resin, it is possible to easily manufacture a partially cloth-attached injection-molded product in which cloth is partially stuck to the surface of the resin-molded product, and the injection pressure is applied to the cloth. Even if added, the cloth will not slip because it is held by the slide core. In addition, a backing material is applied to the back surface of the cloth, and the resin flow is suppressed by the backing material,
The resin is prevented from penetrating outward from the surface of the cloth partially attached to the resin molded product. Further, a groove formed by adhering a cloth is formed on the cloth adhering end portion of the molded product by the ridge portion provided on the mold, and excess cloth is finally cut off in the groove. Therefore, the cut line is inconspicuous, and the appearance of the cloth-bonded end of the molded product is improved.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 are cross-sectional views corresponding to the cross section taken along the line AA and the line BB of FIG. 3 showing an example of a mold for producing the partially cloth-bonded injection-molded article of the present invention. FIG. 3 is an external perspective view showing an example of a partially cloth-bonded injection-molded article manufactured by the mold shown in FIGS. 1 and 2.

This partial cloth-bonded injection-molded product is manufactured by the method shown in FIGS.
A pair of upper and lower molds as shown in the figure, that is, a movable upper mold 1 (corresponding to a second mold) and a fixed lower mold 2
Uses an injection molding die 10 including (corresponding to the first die) and slide cores 3, 4 and 5 which are inserted in a part between the two dies and can slide laterally. To do.

The upper mold 1 includes a movable side mold plate 6, an edge plate 7, and a movable side mounting plate 8. The movable side plate 6 is fixed to the edge plate 7 and can move up and down. 9 is inserted.

The lower mold 2 is composed of a fixed side mounting plate 16 and a core 11 fixedly provided on the fixed side mounting plate 16, and a sprue 12 for injecting a molten resin is formed inside thereof.

The slide cores 3, 4 and 5 are for molding the molding surfaces C, D (surfaces opposite to C), E of the portion of the partially cloth-bonded injection-molded article shown in FIG. Each has a wedge shape, and each is a hydraulic cylinder 13A, 13B, 13
C allows the core 11 to slide along the upper surface of the end portion.

Furthermore, a plurality of spring clamps 15 for tensioning the cloth 14 are provided outside the injection molding die 10 to prevent the cloth 14 from wrinkling.

Next, the operation of this embodiment will be described.

The upper mold 1 shown in FIGS. 1 and 2 is lifted to open the space between the movable side mold plate 6 and the core 11, and a plurality of spring clamps 15 are clamped around the required places to apply tension. Decorative cloth 14
When the mold is closed by inserting and holding the cloth between them, the cloth 14 slides along the shape of the core 11 between the movable-side mold plate 6 and the core 11, and the first molding of the portion to which the cloth 14 is attached. A space S ₁ is formed.

In addition, each slide core 3, 4 is connected to each hydraulic cylinder 1
When 3A, 13B, 13C are activated and moved forward, each slide core
While sliding on the upper surface of the end portion of the core 11, the reference numerals 3 and 4 move to the forward limit shown in FIGS. 1 and 2 to remove the end portions 14a, 14b and 14c which are not attached to the resin molded article of the cloth 14. The upper surfaces of the slide cores 3, 4, 5 and the lower slopes 6a, 6b, 6c of the movable side mold plate 6 hold them in close contact with each other, and between the slide cores 3, 4, 5 and the core 11. The second molding space S ₂ is formed in the part to which the cloth is not attached.

In this way, after the cloth 14 is set at a predetermined position of the injection molding die 10, the molten resin is injected from the sprue 12 by a molten resin injection device (not shown), and the molten resin flows into the molding spaces S ₁ and S _2. Then, the molten resin that has flowed into the first molding space S ₁ adheres the cloth 14 to the surface by the anchor effect, and the molten resin that has flowed into the second molding space S ₂ serves as a portion where the cloth has been attached. It is formed as a part that is not attached.

After the molten resin has been cooled and hardened, the hydraulic cylinders 13A to 13C are operated to retract the slide cores 3, 4 and 5, and the upper mold 1 is lifted to perform the mold release, and at the same time, the plurality of ejecta ectapins 9 are protruded and molded. The subsequent resin molded product is released.

Finally, the end portions 14a, 14b, 14c, which are unnecessary portions of the cloth 14 adhering to the molded product taken out, are cut off so as to have the external shape shown in FIG. The injection-molded product is completed.

In this embodiment, the movable side mold plate 6 of the upper mold 1 is shown in FIG. 3 as an enlarged view of the main parts around the slide cores 3, 4, 5 (reference numeral 5 in this example) in FIG. The portion corresponding to the cloth-bonding end portion F of the partial cloth-bonding injection-molded product is provided with a ridge 6d that slightly projects into the molding space in advance. As a result, a shallow groove in which the cloth 14 is stuck is formed at the cloth sticking end portion F of the molded product.
When the excess cloth is cut off in the final step, the cutting can be performed in the groove, so that even if the cutting line meanders to some extent, it becomes inconspicuous, and the appearance of the cloth sticking end can be improved.

Also, on the back of the cloth, for example, latex, adhesive, tape,
Non-woven fabric, backing material such as urethane or acrylic film is applied. As a result, the resin can be prevented from permeating the surface of the cloth partially attached to the resin molded product, so that the appearance is further improved.

〔The invention's effect〕

As described above, the method for manufacturing a partial cloth-attached injection-molded product according to the present invention includes the first mold and the second mold for forming the first molding space of the portion of the resin-molded product to which the cloths are stuck. A cloth is inserted and held between a pair of molds made of a mold, and a second molding space is formed between the first mold and the slide core in a portion where the cloth is not attached. Since the molten resin is injected into the first and second molding spaces by closely sandwiching the portion where the cloth is not stuck between the mold and the slide core, the partial cloth sticking injection molding can be performed in a small number of steps. Since the product can be easily manufactured, the production cost can be reduced.

In addition, during molding, since the portion of the cloth that is not stuck is closely held by the second mold and the slide core during the molding, the portion that is stuck will not be displaced due to the injection pressure of the resin, and the finish will always be drunk. It is possible to manufacture an injection-molded injection-molded article. Further, since the backing material is applied to the back surface of the cloth, the resin flow is suppressed by the backing material so that the resin is prevented from permeating outward from the surface of the cloth partially attached to the resin molded article. It can be prevented and the appearance can be improved.

Further, since the ridges projecting into the molding space are provided at the end of the second mold on the slide core side, it is possible to form the groove on which the cloth is adhered at the cloth adhering end of the molded product, Finally, excess fabric can be cut off in the groove. Therefore, even if the cut line meanders to some extent, it becomes inconspicuous, and the appearance of the cloth-bonded end of the molded product can be improved.

[Brief description of drawings]

1 and 2 show an example of a mold for producing the partially cloth-bonded injection-molded article of the present invention, which is taken along the line AA and BB in FIG.
Cross-sectional views corresponding to line cross-sections, FIG. 3 is an external perspective view showing a partial cloth-bonded injection-molded product manufactured by the mold shown in FIGS. 1 and 2, and FIG. It is a principal part expanded sectional view of the slide core periphery of the metal mold | die shown in FIG. 1 ... Upper mold, 2 ... Lower mold, 3,4,5 ... Slide core 6 ... Movable mold plate, 6d ... Ridge portion, 10 ... Injection molding mold 11 ... Core, 12 ... Sprue 13A, 13B, 13C … Hydraulic cylinder 14… Cloth, S ₁ , S ₂ … Molding space

Claims (1)

[Claims] 1. A method for producing a partially cloth-attached injection-molded product, wherein a cloth such as a woven fabric or a non-woven fabric is partially stuck on the surface of a resin molded product, and a second metal mold is provided so as to face the first mold. A mold is arranged, and a slide core adjacent to the second mold is arranged so as to be interposed between a pair of molds including the first mold and the second mold, The mold of No. 2 is provided with a ridge portion projecting into the molding space at the end of the mold on the side of the slide core, and a backing material for preventing resin from permeating the cloth on the back surface between the pair of molds. After holding, the pair of molds are brought close to each other to form a first molding space of a portion to which the cloth of the resin molded product is stuck, and the second mold and the slide core. The part of the cloth which is not attached is closely sandwiched by the first mold and A second molding space is formed between the slide core and the slide molding, the second molding space being a portion where the cloth of the resin molded product is not attached, and the first molding space and the first molding space formed between the pair of molds and the slide core. 2. A method for manufacturing a partially cloth-bonded injection-molded article, which comprises injecting a molten resin into the molding space of 2 to perform resin molding.