JP3092282B2 - Manufacturing method for insert molded products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing an insert molded product in which an insert component is inserted into a molding die, a resin portion is molded by insert molding, and fixed to the insert component, particularly as a vehicle component such as a window. The present invention relates to a method for manufacturing a suitable insert molded product.

[0002]

2. Description of the Related Art FIG. 3 is a front view of a vehicle window as an example of an insert molded product, FIG. 4 is a side view thereof, and FIG.

In FIG. 1, reference numeral 1 denotes an insert molded product (window), a first insert component (window plate) 2 made of a glass plate or the like having a radius of curvature R, and a second insert component made of a metal foil, a colored film or the like. (Decorative strips) 3 and a resin portion (frame portion) 4 fixed to the first and second insert components 2 and 3.

[0004] An opaque colored layer 5 is formed on the periphery of the back surface of the first insert part 2, and the first insert part 2 including the periphery and the resin part 4 are bonded as a fixing means. The agent layer 6 is formed. The second insert component 3 is formed with a through hole 7 as fixing means, and is fixed by filling the resin portion 4 into the through hole 7.

FIG. 6 is a sectional view of a molding die for producing the above-mentioned insert molded product 1. As shown in FIG. In the figure, reference numeral 10 denotes a mold, in which a cavity 13 is formed between a cavity mold 11 and a core mold 12. 14 is a runner, 15 is a gate, 1
Reference numerals 6, 17, and 18 denote push-off portions, and reference numeral 19 denotes a void portion.

[0006] In the method of manufacturing the insert molded product 1, an opaque colored layer 5 and an adhesive layer 6 are first formed on the first insert component 2, and a through hole 7 is formed on the second insert component 3. Then, the periphery of the first insert part 2 and the second insert part 3 are inserted into the cavity 13 of the molding die 10 and the die is closed. At this time, the first insert component 2 is sandwiched and positioned by the push-off portions 16 and 17, and the second insert component 3 is pressed and positioned by the push-off portion 18 by a pin (not shown) or the like. In this state, the resin is injected into the cavity 13 from the runner 14 through the gate 15, and the resin portion 4 is molded and fixed to the first and second insert components 2 and 3, thereby manufacturing the insert molded product 1.

[0007]

However, in the above-described method for manufacturing an insert molded product, the first and second insert parts 2 and 3 are in direct contact with the press-cut portions 16, 17 and 18 of the molding die 10. To be easily damaged. In particular, as shown in FIG.
In the case of the insert part 2 or the second insert part 3 made of a bent product, the tendency is large because the pressing force must be increased because the shape varies greatly. Further, when the injection pressure of the resin is high as in injection molding, there is a problem that the first and second insert members 2 and 3 are easily damaged or deformed.

In order to improve such a point, a strippable coating layer is formed in advance on a portion of the insert part which comes into contact with the mold, and insert molding is performed. After molding, a cut is made in an unnecessary portion of the coating layer. There has been proposed a method of inserting and peeling (JP-A-58-110786).

However, in such a method for producing an insert molded product, when a cut is made in the coating layer, the insert part is also cut, which may cause a crack. A cut may occur in the part.

[0010] An object of the present invention is to solve the above-mentioned problems by forming a coating layer on an insert part and damaging the insert part by its cushioning action and sealing action.
An object of the present invention is to propose a method for manufacturing an insert molded product that can prevent breakage, deformation, and occurrence of burrs, and can easily remove a coating layer.

[0011]

The present invention relates to the following method for producing an insert molded product. (1) In a method in which an insert part is inserted into a molding die, a resin portion is molded by insert molding and fixed to the insert part, a portion of the insert part that comes into contact with the molding die is previously dissolved, melted, sublimated, or removed. A step of forming a degradable coating layer, a step of inserting an insert part having the coating layer formed therein into a mold, and molding and fixing a resin portion by insert molding, and dissolving the coating layer from the obtained insert molded product. , Melting, sublimation or decomposition to remove. (2) The method according to the above (1), wherein the coating layer has solubility in a solvent, and is dissolved and removed in the solvent after molding. (3) The method according to the above (1) or (2), wherein the coating layer is formed up to a portion to be a peripheral portion of the resin portion.

In the present invention, as the insert part, a bent product of a metal plate such as stainless steel or aluminum, a die cast product or an extrusion product of a low-temperature melting alloy, an injection molded product or an extrusion product of a hard synthetic resin. For example, a hard material is suitable, but not limited thereto. These insert parts may be those whose surfaces have been subjected to decorative treatment such as painting, plating, metallizing and the like.

In the insert molding according to the present invention, the insert part is partially exposed on the outer surface of the molded article.
The resin is molded by inserting the insert component into the mold, and there are cases where a part of the insert component is inserted into the mold and cases where the entire insert component is inserted. As the molding method, any molding method such as injection molding (including reaction injection molding) and compression molding can be adopted. Insert part is 1
The number may be one or more.

Examples of the coating layer include those having solubility in a solvent such as water, those having a melting property or sublimation property with respect to heat, and those having decomposability with respect to heat and ultraviolet rays. Can be Those exhibiting solubility in a solvent are applied in a state of being dissolved in the solvent, dried, dried and cured to form a coating layer, and after being molded, the coating layer is dissolved and removed.

Among these, those having solubility in a solvent are preferable, and those having water solubility are particularly preferable.
As such a water-soluble substance, a natural or synthetic water-soluble polymer substance such as starch, gelatin, partially saponified polyvinyl alcohol, modified polyvinyl alcohol, polyethylene oxide, and methylcellulose can be used. These can be dissolved or dissolved in water, warm water or other aqueous solvents and applied or removed. The formation of the coating layer is not limited to the method of coating, drying, and curing, and a film- or tape-shaped material may be applied in advance.

In addition, various synthetic resins can be used as those having solubility in alcohols, hydrocarbon-based organic solvents and the like, or those having melting properties in heat. Alternatively, it is melted and removed by heat. Those having sublimability and decomposability are removed by sublimation or decomposition by heating or irradiation with ultraviolet rays.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a part of a molding die showing a method of manufacturing the vehicle window shown in FIGS. 3 to 5 as an insert molded product, and FIG. 2 is a system diagram of a coating layer removing apparatus. The same reference numerals indicate the same or corresponding parts.

In FIG. 1, a molding die 10 is configured substantially in the same manner as in FIG. 21 is a coating layer. In FIG. 2, 22 is an immersion tank, 23 is a solvent, and 24 is a circulation device.

The method of manufacturing the insert molded product 1 is as follows.
The adhesive layer 6 is formed on the first insert part 2 on which the opaque colored layer 5 is formed, and the second insert part 3 is formed.
Then, a covering layer 21 is formed in a portion of the first and second insert parts 2 and 3 which comes into contact with the molding die 10.

In the embodiment, the coating layer 21 is formed by dissolving a water-soluble polymer such as starch in water, applying the solution, and drying. At this time, it is preferable that the coating layer 21 is formed slightly over the edge portions of the push-off portions 16, 17, and 18 so as to be formed up to the portion that becomes the peripheral portion of the resin portion 4.

Thereafter, the periphery of the first insert part 2 and the second insert part 3 are inserted into the cavity 13 of the mold 10 and the mold is closed. At this time, the first insert part 2 is sandwiched by the push-off parts 16 and 17, and the second insert part 3 is pressed and positioned by the push-off part 18 by a pin (not shown) or the like, but the coating layer 21 is interposed therebetween. Therefore, the insert parts 2 and 3 are prevented from being damaged, damaged, deformed, and the like by the buffering action of the coating layer 21.

In this state, the resin is injected into the cavity 13 from the runner 14 through the gate 15 to form the resin part 4 and fixed to the first and second insert parts 2 and 3.
At this time, due to the sealing action of the coating layer 21, the resin does not leak, and no burr occurs.

After the molding, the mold is opened, the insert molded product 1 is taken out, and immersed in a solvent 23 of an immersion tank 22 as shown in FIG. Then, the solvent is brought into contact with the circulating device 24 while circulating, so that the coating layer 21 is dissolved in the solvent 23 and removed. Thereafter, the insert molded product 1 is taken out to obtain a product.

In the above embodiment, an example is shown in which two first and second insert parts 2 and 3 are used as insert parts, but the number is not limited. Although the adhesive layer 6 and the through-hole 7 are shown as means for fixing the insert part and the resin portion 4, other means may be used. Furthermore, the coating layer 21 is not limited to a water-soluble substance, and other dissolving, melting, sublimating, or decomposable substances can be used.

The present invention is not limited to a vehicle window.
It can be applied to the manufacture of other insert parts, and the molding method is not limited to injection molding, and other molding methods may be used.

[0026]

According to the present invention, a dissolving, melting, sublimating or decomposable coating layer is formed on a portion of the insert part which comes into contact with the mold, and insert molding is performed. Since it is removed by sublimation and decomposition, it is possible to prevent the insert component from being damaged, damaged, deformed, and to have burrs due to the buffering action and sealing action of the coating layer. Further, the coating layer can be easily removed without causing any damage to the insert molded product. For this reason, an insert molded product excellent in appearance, strength, and the like can be easily manufactured.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a part of a mold showing a manufacturing method according to an embodiment.

FIG. 2 is a system diagram of a coating layer removing apparatus showing a manufacturing method according to an embodiment.

FIG. 3 is a front view of a vehicle window.

FIG. 4 is a side view of FIG. 3;

FIG. 5 is a sectional view taken along line AA of FIG. 3;

FIG. 6 is a sectional view of a molding die.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 insert molded product 2 first insert component 3 second insert component 4 resin portion 5 opaque colored layer 6 adhesive layer 7 through hole 10 molding die 11 cavity die 12 core die 13 cavity 14 runner 15 gate 16, 17, 18 Pressing part 21 Coating layer 22 Immersion tank 23 Solvent 24 Circulation device

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 45/14 B29C 33/12-33/18 B29C 39/10 B29C 43/18

Claims (3)

(57) [Claims] 1. A method of inserting an insert part into a molding die, molding a resin part by insert molding and fixing the resin part to the insert part, wherein a portion of the insert part which comes into contact with the molding die is previously dissolved, melted, and sublimated. Forming a degradable or degradable coating layer, inserting an insert part having the coating layer formed into a mold, and molding and fixing a resin portion by insert molding, and forming a coating layer from the obtained insert molded product. Dissolving, melting, sublimating or decomposing to remove. 2. The method according to claim 1, wherein the coating layer has solubility in a solvent, and is dissolved and removed in the solvent after molding. 3. The method according to claim 1, wherein the coating layer is formed up to a portion which becomes a peripheral portion of the resin portion.