JP2000272014A - Production of resin product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a resin product which prevents the deterioration in product appearance, can form the product in which the development of cracks and defective joining is controlled. and can extends the life of a mold. SOLUTION: A passage 3 is formed in the joining part 2 between resin parts 1. In a method for producing a resin product in which the resin parts 1 are joined by a joining resin 4 by packing the resin 4 in the passage 3, a projection part 5 for preventing the protrusion of the resin 4 outside the passage 3 is formed in at least one resin part 1. The projection part 5 acts as a sealing means to prevent the protrusion of the resin 4 outside the passage 3. Since no sticking projection which is stuck into the resin part 1 is used, the surface of the resin product is free from the trace of the projection.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the manufacture of resin products used for toilet seats, lids for pots, rice cookers and jars, household goods such as dishwashers, and tanks for storing fluids. It is about the method.

[0002]

2. Description of the Related Art Conventionally, a resin product has been manufactured by joining a plurality of resin parts. For example, the resin product shown in FIG. 10 is the toilet seat 10, and the toilet seat body 13 and the toilet seat back plate 14 with which the buttocks are in contact are made of the resin part 1,
It is formed by joining these. In joining the toilet seat body 13 and the toilet seat back plate 14, first,
The toilet seat body 13 and the toilet seat back plate 14 are inserted into the mold 6, and the toilet seat body 13 and the toilet seat back plate 14 are combined in the mold 6. At this time, the end portions of the toilet seat body 13 and the toilet seat back plate 14 are joined to each other to form the joint portion 2.
, A passage 3 is formed between the toilet seat body 13 and the toilet seat back plate 14, and the passage 3 is opened on the surface side of the toilet seat back plate 14. Next, the joining resin 4 such as a thermoplastic resin is injected into the mold 6 by an injection molding machine or the like, and the passage 3 is filled with the joining resin 4 from the opening thereof. The toilet seat body 13 and the toilet seat back plate 14 are bonded and joined. Thus, the toilet seat 10 is formed.

As described above, the toilet seat body 13 and the toilet seat back plate 14
It is difficult to completely adhere the surface of the joining portion 2 and the molding surface of the mold 6 in a state where the
A gap is formed between the surface of the joint 2 and the molding surface of the mold 6. Therefore, when filling with the joining resin 4, the joining resin 4 flows into the gap, and the appearance of the toilet seat 10 is impaired by the joining resin 4 protruding from the passage 3, or the joint failure between the toilet seat body 13 and the toilet seat back plate 14. May happen.

[0004] Therefore, as shown in FIG.
Is formed on the molding surface of, so that when the toilet seat body 13 and the toilet seat back plate 14 are inserted into the mold 6, the bite projections 50 bite into the surface of the joint 2 around the opening of the passage 3. In addition, the gap is blocked by the biting projection 50 to prevent the joining resin 4 from flowing into the gap.

[0005]

However, when resin parts are joined by a conventional method, as shown in FIG. 11 (b), traces of the digging projections 50 left on the surface of the joint 2 of the toilet bowl 10 remain. There was a problem that the appearance of the toilet bowl 10 deteriorated. In addition, there is a problem that a crack or a crack is easily generated in the toilet 10 from a portion where the bite protrusion 50 bites.

Further, the biting projection 50 may be deviated from a predetermined position and bite due to factors such as deviation in the finished dimensions, deformation, and warpage of the resin part 1, so that the biting projection no longer serves its role. FIG. 12 (a)
As shown in (b), the joining resin 4 flows into the gap between the surface of the joining portion 2 and the molding surface of the mold 6, causing a problem that the appearance of the toilet 10 is deteriorated and the joining of the resin component 1 is poor. was there.

[0007] In addition, the bite protrusion 50 is formed for each joining.
Is made to bite into the resin component 1, so that a large force is applied to the biting projection 50 each time it is joined.
The wear and breakage of the biting projections 50 are likely to occur, and
Has a short life span.

[0008] The present invention has been made in view of the above points, and it is possible to form a resin product that does not deteriorate the appearance of the resin product, and that hardly causes cracks, cracks, and bonding defects. It is an object of the present invention to provide a method for manufacturing a resin product that can extend the life of a mold.

[0009]

According to a first aspect of the present invention, there is provided a resin product manufacturing method, comprising:
In a method of manufacturing a resin product in which a plurality of resin parts 1 are joined with the joining resin 4 by forming the passages 3 in the passages 3 and filling the joining resin 4 into the passages 3, the joining resin 4 is
Is characterized in that at least one resin component 1 is provided with a protruding portion 5 for preventing it from protruding outside.

According to a second aspect of the present invention, there is provided a resin product manufacturing method according to the first aspect, wherein the protrusion 5 is provided with a mold 6.
And fall into the passage 3 by being pressed by the

According to a third aspect of the present invention, there is provided a method of manufacturing a resin product according to the first or second aspect, wherein the tip of the protrusion 5 is formed at an acute angle. .

[0012]

Embodiments of the present invention will be described below.

In this embodiment, a method of manufacturing the toilet seat 10 as shown in FIGS. 2 to 6 as a resin product will be described, but the present invention is not limited to this. This toilet seat 10 is formed in a substantially donut shape in plan view,
A toilet seat opening 11 is provided substantially at the center, and a plurality of foot members 31 are provided on the back surface of the toilet seat 10.
Further, the toilet seat 10 is a heating toilet seat, in which a plurality of heating elements 12 are provided.
Electric power is supplied via an electric wire 18 derived from the power supply, and heat is generated by this power supply. The toilet seat 10 is formed by combining and joining a toilet seat body 13 which is a resin part 1 and a toilet seat back plate 14 which faces the toilet seat body 13. Further, a space portion 58 is formed over the entire length of the toilet seat 10 and is surrounded by the toilet seat body 13 and the toilet seat back plate 14,
The space 58 is formed so as to enhance the heat insulation of the toilet seat 10. The toilet seat body 13 and the toilet seat back plate 14 are AB
It is formed using an appropriate resin such as an S resin (a copolymer resin of acrylonitrile, butadiene, and styrene) and a polypropylene resin.

The toilet seat main body 13 has a main body opening 30 constituting the toilet seat opening 11 at a substantially central portion and is formed in a substantially donut shape in plan view. As shown in FIG. The contact portion 20 on the buttocks side of the body, an inner peripheral piece 21 formed so as to surround the main body opening 30, and an outer peripheral piece 22 constituting the outer periphery of the toilet seat 10 are formed in a substantially U-shaped cross section. The inner peripheral piece 21 is provided with an inner notch 23 that opens on the back side over the entire circumference, and the outer peripheral piece 22 is provided with an outer notch 24 that opens on the back side over the entire circumference. ing. The inner notch 23 is formed by the inner insertion piece 25 and the inner peripheral piece 2.
6, and the outer notch 24 is formed by being sandwiched between the outer insertion piece 45 and the outer peripheral piece 46. On the back surface of the inner peripheral piece 26 and the back surface of the outer peripheral piece 46, At the opening edges of the inner cutout 23 and the outer cutout 24, the projections 5 as shown in FIG. 1 are provided over the entire length of the inner peripheral piece 26 and the outer peripheral piece 46. This projection 5
Is formed at an acute angle.

The toilet seat back plate 14 has a back plate opening 32 which constitutes the toilet seat opening 11 at a substantially central portion, and the toilet seat main body 1 in a plan view.
3, and constitutes the surface of the toilet seat 10 on the side of the toilet, as shown in FIG. Inner end of toilet seat back plate 14 (back plate opening 3
An inner reinforcing portion 34 is provided at the end portion on the second side) over the entire length of the toilet seat back plate 14, and the inner reinforcing portion 34 has a substantially L-shaped cross section projecting toward the back plate opening 32. A stop piece 35 is provided over the entire length of the inner reinforcing portion 34. Further, as shown in FIG. 1, a projection 5 is provided on the rear surface of the inner locking piece 35 so as to protrude over the entire length of the inner locking piece 35. Further, an outer reinforcing portion 36 is provided at an outer end portion of the toilet seat back plate 14 (an outer peripheral end portion of the toilet seat 10) over the entire length of the toilet seat back plate 14, and a cross section is formed on an outer surface of the outer reinforcing portion 36. A substantially L-shaped outer locking piece 37 is provided to protrude over the entire length of the outer reinforcing portion 36. Also, as shown in FIG.
A projection 5 is provided on the back surface of the projection 7 over the entire length of the outer locking piece 37. The tip of the projection 5 is formed at an acute angle.

When the toilet seat body 13 and the toilet seat back plate 14 are joined, a mold 6 composed of an upper mold 40 and a lower mold 41 is used.
This is performed using The upper die 40 is provided with a recessed back plate storage portion 42 which is opened on the lower surface thereof. The back plate storage portion 42 is formed in a shape into which the toilet seat back plate 14 can be fitted. A plurality of supply portions 43 are formed in the upper die 40 and open to the upper surface and the back plate storage portion 42, and the opening of the supply portion 43 on the back plate storage portion 42 side is formed as an inlet 44. The lower die 41 is provided with a recessed body storage portion 45 which is open on the upper surface thereof, and the body storage portion 45 is formed in a shape into which the toilet seat body 13 can be fitted.

The joining of the toilet seat body 13 and the toilet seat back plate 14 is performed as follows. First, as shown in FIG. 7, the toilet seat body 13 and the toilet seat back plate 14 are arranged so as to face each other, the inner locking piece 35 is inserted into the inner notch 23, and the inner side between the inner locking piece 35 and the inner reinforcing portion 34 is inserted. Insert 2
5, the outer locking piece 37 is inserted into the outer notch 24, and the outer insertion piece 45 is inserted between the outer locking piece 37 and the outer reinforcing part 36, so that the inner locking piece 35 and the inner plug piece are inserted. The toilet seat body 13 and the toilet seat back plate 14 are combined with each other by locking the 25 and the outer locking piece 37 with the outer insertion piece 45. By combining the toilet seat body 13 and the toilet seat back plate 14 in this manner, as shown in FIG. 1A, the inner notch 23 is formed in the joint 2 between the toilet seat body 13 and the toilet seat back plate 14.
And an inner passage 3a formed of an outer notch 24 and an outer locking piece 37.
Is formed as The protrusion 5 at the edge of the inner passage 3a is positioned so as to be inclined toward the inner passage 3a and protrudes toward the rear surface, and the protrusion 5 at the edge of the outer passage 3b is inclined toward the outer passage 3b and closer to the rear. Located to protrude.

Next, as shown in FIG. 8, a combination of the toilet seat body 13 and the toilet seat back plate 14 is combined with an upper mold 40 and a lower mold 4.
Set between 1. At this time, the toilet seat body 13 is
And the toilet seat back plate 14 is stored in the back plate storage portion 42 of the upper die 40. Also, the upper mold 40
By clamping the lower mold 41 and the lower mold 41, as shown in FIG. 1 (b), the projection 5 is pressed by the back plate storage part 42 and falls into the inside passage 3a and the outside passage 3b. The angle formed between the contact surface of the depressed protrusion 5 and the mold 6 (upper die 40) and the direction of the passage 3, ie, the angle α of the tip of the depressed protrusion 5, is formed to be an acute angle. Furthermore, inside passage 3
a corresponding to the opening of the outer passage 3b and the opening of the outer passage 3b.
Will be located. The introduction port 44 is preferably formed at a position where the joining resin 4 can flow into the inner passage 3a and the outer passage 3b with substantially the same length.
It is preferable that the inlets 44 are located at regular intervals along the inner passage 3a or the outer passage 3b.

Next, the joining resin 4 is injected into the inner passage 3a and the outer passage 3b through the supply section 43 and the inlet 44 by injection molding or the like, and as shown in FIG.
And, the outer passage 3b is filled so as to be completely filled with the joining resin 4. At this time, the inner passage 3a and the outer passage 3b
Since the protruding portions 5 are protruded from the opening edge portions, the joining resin 4 can be prevented from protruding out of the inner passage 3a and the outer passage 3b (leakage does not occur). As the joining resin 4, a thermoplastic resin such as an ABS resin or a polypropylene resin can be used, and the joining resin 4 is injected and filled in a molten state. At this time, the joining resin 4
By the action of the heat, the tip of the projection 5 is melted, and the tip of the projection 5 is rounded. Thereafter, the filled joining resin 4 is cooled and hardened, and the toilet seat body 13 and the toilet seat back plate 14 are firmly fixed and joined at the joining portion 2 with the cooled and hardened joining resin 4. At this time, the protruding portion 5 having a rounded tip bites into the bonding resin 4. Next, as shown in FIG. 9, the upper mold 40 and the lower mold 41 are opened to release the integrated body of the toilet seat body 13 and the toilet seat back plate 14, and the foot member 31 is attached to the back surface of the toilet seat back plate 14. Thus, the toilet seat 10 can be formed.

As described above, in the present invention, as shown in FIG. 6, a resin 3 for joining is filled in a passage 3 formed in a joint portion 2 of a plurality of resin parts 1 and cooled and cured. In a method of manufacturing a resin product in which
The protrusion 5 for preventing the joining resin 4 from protruding out of the passage 3 is provided at the opening edge of the passage 3 in which the joining resin 4 is filled. The resin 4 for use can be prevented from protruding out of the passage 3 (not leaking out). In addition, since the bite projection that bites into the resin part 1 is not used unlike the conventional example, it is possible to prevent the trace of the bite projection from being left on the surface of the resin product, and the appearance of the resin product is deteriorated. In addition, cracks and cracks do not easily occur in the resin product, and in addition, wear and breakage of the mold 6 do not easily occur, and the life of the mold 6 can be extended. Further, even if the finished dimension of the resin component 1 is slightly shifted, deformed, warped, or the like, the projection 5 is formed substantially at the opening edge of the passage 3. 4 can surely be prevented from protruding, and can prevent the appearance of the resin product from deteriorating and the occurrence of poor joining of the resin parts.

Further, since the projection 5 is pressed when the mold 6 is clamped and falls into the passage 3, it can be prevented from projecting to the outer surface of the resin product. In addition, the adhesion between the mold 6 and the resin component 1 can be reduced by the protrusion 5.
It can be raised in the part.

Further, since the angle between the contact surface of the collapsed protrusion 5 and the mold 6 and the direction of the passage 3, that is, the angle α of the tip of the collapsed protrusion 5 is formed at an acute angle, it hardens. The protrusions 5 can be made to bite into the joining resin 4, so that the joining strength of the plurality of resin parts 1 can be increased. Of the bonding resin 4 to the outer surface of the substrate.

The size and shape of the passage 3 and the conditions for filling the joining resin 4 are set according to various resin products. For example, in the case of the toilet seat 10 as described above, the size of the passage 3 The height is set to about 4 mm in depth × 2 mm in width in cross section. The flow length at the time of filling the bonding resin 4 is, for example, 53 in the case of the passage 3 having a depth of 4 mm and a width of 2 mm under the conditions of the resin temperature of 280 ° C. and the injection pressure of 500 kgf / cm ^2.
It can be set to 0 mm. Further, the inner passage 3a
Can be set to three, and the number of inlets 44 opened to a position corresponding to the outer passage 3b can be set to five.

[0024]

As described above, according to the first aspect of the present invention, a plurality of resin parts are formed by forming a passage in a joint portion of the plurality of resin parts and filling the passage with a joining resin. In the method of manufacturing a resin product to be joined with the joining resin, the projecting portion is provided on at least one resin component to prevent the joining resin from protruding out of the passage. The resin for use does not protrude out of the passage and does not use biting protrusions that bite into the resin parts, so that no trace of the biting protrusions left on the surface of the resin product The resin product does not degrade its appearance, and is less likely to crack or crack in the resin product. In addition, the wear and breakage of the mold are less likely to occur, and the life of the mold is prolonged. One in which it is bet. further,
Even if the finished dimensions of the resin parts are slightly displaced, deformed, or warped, the protrusions are formed almost at the opening edge of the passage, and the protrusions securely prevent the joining resin from protruding. Thus, it is possible to prevent the appearance of the resin product from being deteriorated and the joining failure of the resin component from occurring.

According to the second aspect of the present invention, since the protrusion is pressed by the mold and falls into the passage, the protrusion can be prevented from protruding to the outer surface of the resin product, and the appearance of the resin product can be reduced by the protrusion. Therefore, the adhesiveness between the mold and the resin component can be increased at the protruding portion.

In the invention of claim 3 of the present invention, since the tip of the projection is formed at an acute angle, the projection can be cut into the joining resin, and the joining strength of the plurality of resin parts can be reduced. The height can be increased, and moreover, the protrusion of the joining resin to the outer surface of the resin product can be made less likely to occur than forming the tip of the projection at an obtuse angle.

[Brief description of the drawings]

1A and 1B show an example of an embodiment of the present invention.
(C) is a partial sectional view.

FIG. 2 is a perspective view showing the same resin product.

FIG. 3A is a cross-sectional view, and FIG. 3B is a schematic view.

FIG. 4 is a plan view of the same.

FIG. 5 is a bottom view of the above.

FIG. 6 is a sectional view taken along the line AA of FIG. 3 (b).

FIG. 7 is a sectional view of the above.

FIG. 8 is a sectional view of the same.

FIG. 9 is a sectional view of the above.

FIG. 10 is a partial cross-sectional view showing a conventional example.

11A and 11B are partial cross-sectional views showing a conventional example.

FIGS. 12A and 12B are partial cross-sectional views showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin component 2 Joining part 3 Passage 4 Joining resin 5 Projection part 6 Die

Continued on the front page (72) Inventor Sadayuki Monana 207, Ichibancho, Nishi-Kasugai-gun, Aichi Prefecture, Nagoya Matsushita Electric Works Co., Ltd. Nagoya Matsushita Electric Works Co., Ltd. 4F211 AA11 AA13 AD05 AD25 AG07 AG13 AG23 AH42 AH49 AH51 TA08 TC09 TC13 TC14 TD07 TD11 TD15 TH02 TH18 TJ22 TN82

Claims (3)

[Claims] 1. A method of manufacturing a resin product in which a plurality of resin parts are joined with a joining resin by forming a passage in a joint portion of the plurality of resin parts and filling the passage with a joining resin. A method for manufacturing a resin product, comprising: providing at least one resin component with a protrusion for preventing the resin for use from protruding out of a passage. 2. The method for producing a resin product according to claim 1, wherein the protrusion is pressed by a mold and falls into the passage. 3. The method for producing a resin product according to claim 1, wherein the tip of the projection is formed at an acute angle.