JPH0655381B2 - Method for manufacturing synthetic resin molded body integrally molding skin material - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for producing a synthetic resin molded body in which a skin material is integrally molded, and its object is to bond a skin material having a raised or foamed layer to a synthetic resin. In the case of producing a synthetic resin molded body, the synthetic resin molded body is molded in a state in which the raised hair of the skin material is laid down or the foam layer is collapsed by the pressing force of the mold when shaping the synthetic resin molded body. Another object of the present invention is to provide a method for producing a synthetic resin molded body, which integrally molds a skin material, to prevent the occurrence of such damage.

(Background of the Invention) As a method of manufacturing a synthetic resin molded body in which a skin material is integrally molded, for example, as shown in FIG. 7 (A), an upper and lower separation type metal mold composed of a male mold (a) and a female mold (b) There is a method using a mold.

To explain this method, first, the male mold (a) and the female mold (b) are opened, and the skin material (c) is placed in advance between these molds (a) and (b).

Next, the elevating mechanism drives the female mold (b) (or the male mold (a)) to bring the two molds (a) and (b) close to each other.

During the process of approaching both molds (a) and (b), the molten resin (e) passes through the molten resin path (not shown) to the male mold (a) (or female mold).
It is supplied on the meshing surface of (b)).

Thereafter, as shown in FIG. 7 (B), both molds (a) and (b) are meshed with each other to form a synthetic resin molded body (f) integrally molded with the skin material.

The mating of both molds (a) and (b), even after the synthetic resin molded body is shaped,
Until the synthetic resin is completely molded (that is, fused resin
(e) is cured).

After the synthetic resin is completely molded, the molds (a) and (b) are disengaged by the elevating mechanism, and finally the synthetic resin molded body integrally molded with the skin material is released from the mold. .

The above process can be represented by a line graph as shown in FIG. (The vertical axis shows the distance between the mating surfaces of both molds (a) and (b), and the horizontal axis shows the passage of time.) From the initial setting position (g) of both molds (a) and (b) to both molds (a) Up to the meshing position (h) in (b), the driving of both molds (a) and (b) is continuously performed without stopping halfway.

The molten resin (e) is supplied at a predetermined time (i) during this period.

The mating of both molds (a) and (b) is carried out for a time required for shaping the synthetic resin molded body (i) integrally molded with the skin material and curing the fused resin (e).

At the time (j) when the molten resin (e) hardens, the mating of both molds (a) and (b) is released, and both molds (a) and (b) are continuously driven to the initial setting position (g). .

However, in the above-mentioned conventional method for producing a synthetic resin molded body that integrally molds a skin material, when the skin material (c) has a raised (d) or when the skin material has a foam layer (Fig. If not) there was a problem.

That is, the brush (d) of the skin material (c) has a mold (female mold in the illustrated example).
Since the contact time of the meshing surface of (b), especially the meshing time of both molds (a) and (b) is long, the raised hair (d) is pressed for such a long time.

Alternatively, in the case of a skin material having a foam layer, the foam layer is pressed for a long time due to this long-term engagement.

The brushing (d) falls over due to this long-time pressurization, and both types (a)
In the disengagement synthetic resin (b), the raised hair (d) often did not return to the standing state.

Alternatively, it was a skin material in which the foam layer was crushed.

For this reason, as shown in FIG. 8, a raised (d) laid over skin material.
The synthetic resin molded product (f) to which (c) was stuck was manufactured into a molded product, or the foamed layer was crushed to form a molded product with a poor texture, impairing its appearance and reducing the commercial value.

As a means for obtaining a synthetic resin molded body that integrally molds a skin material in which the raised state of the raised hair or the foamed state of the foamed layer is maintained, shortening the meshing time of both molds (a) and (b) is applied to the raised hair. Although it is possible to reduce the pressing time, if the meshing time is simply shortened, the raised state of the raised hair or the texture of the foam layer is maintained, but there is a problem with the moldability of the synthetic resin.

That is, in order to form the fused resin (e) into a synthetic resin molded article, the fused resin (e) should be shaped in both molds (a) and (b) for the time required for curing. It is necessary to keep it, but if the time to keep this shaped form is short, both molds
After the molds of (a) and (b) are opened, the fused resin may exude from the ends of the synthetic resin molded body, causing the synthetic resin molded body to lose its shape.

Therefore, such a method of simply shortening the engagement time cannot be adopted.

(Prior Art) Further, as a method for manufacturing a synthetic resin molded body in which a skin material is integrally molded, there is a technology disclosed in JP-A-64-63111.

As shown in FIG. 10, the disclosed technique includes a sheet-like skin material (A) formed by sticking a synthetic resin foam elastic layer (C) to the back surface of a cloth (B) having a raised surface on one side. Placed so that the surface of the fabric (B) is in contact with the molding surface of the upper die (D) of the resin press molding machine released in advance, and within the molding surface area of the lower die (E) facing the upper die (D). After placing the base material layer (F) of the thermoplastic resin in the plasticized state in the required amount, the two types (D)
A method of integrally molding the sheet-like skin material (A) and the base material layer (F) by closing (E) and using the mold clamping pressure, wherein the temperature of the upper mold (D) is 10 ° C. or lower, and the lower mold is The temperature of (E) is maintained at 10 to 25 ° C., and the mold clamping pressure of 100 kg f / cm ² is applied within 1 second, and the mold clamping pressure is set to 5 after 1 to 5 seconds after reaching the pressure. Reduce pressure to ~ 30kg f / cm ²
It was held for 60 seconds.

The peripheral portion of the sheet-like skin material (A) is vacuum-adsorbed by the upper mold (D) during mold clamping, or is fixed to the upper mold (D) by a clip, a pin or the like.

(Problems to be solved by the invention) However, after 1 to 5 seconds, the mold clamping pressure of 100 kg f / cm ² was changed to 5
Since the pressure is reduced to ~ 30 kg f / cm ² or less, when the mold clamping pressure is reduced, the distance between the upper mold and the lower mold is wide, that is, the upper mold is elevated from the lower mold to a higher position. High pressure is required when shaping the molded body.

In order to obtain this high pressure, a molded body cannot be manufactured without using a large molding die.

Also, since the peripheral edge of the sheet-like skin material is vacuum-adsorbed or fixed to the upper die with clips, pins, etc., if there is an extra length in the sheet-like skin material when the die is clamped, this portion In order to clamp the mold without escaping from inside the mold,
There is a possibility that a molded product in which the sheet-shaped skin material has wrinkles is produced.

(Means for Solving the Problem) The present invention comprises a synthetic resin molding die having a male die and a female die, and a skin material fixing frame provided at a constant interval in the vicinity of the male die. A method for producing a synthetic resin molded body, comprising integrally molding a skin material by engaging a male die and a female die of a molding die, wherein a male die and a female die are fixed after fixing a peripheral edge portion of the skin material to the skin material fixing frame. The mold is meshed with, and the meshing time for bonding the skin material to the fused resin is only the minimum required shaping time, and after this meshing, the distance between the meshing surfaces of the two molds is set to An integral molding of a skin material, characterized in that the thickness in a raised state or the thickness of the foam layer of the skin material and the thickness of the fused resin formed by the meshing are made to be approximately the same for a certain period of time. The above problem is solved by the method for producing a synthetic resin molded body.

(Operation) The peripheral edge portion of the skin material is fixed to the skin material fixing frame and arranged between the male and female mating surfaces.

By driving the driving type of the male type and the female type, these two types are brought close to each other.

Then, the driving mold is driven and the molten resin is supplied during this period, and after the supply, both molds are engaged with each other.

This engagement is the minimum time required to form the synthetic resin molded body by bonding the skin material to the fused resin.

Since the meshing time is short in this way, even if the raised hair of the skin material is temporarily collapsed due to pressure, it is restored to the standing state after the meshing is released.

Further, when the skin material has a foam layer, even if the foam layer is temporarily deformed under pressure, the foam state is restored again after the engagement is released.

Then, by driving the driving die, the distance between the mating surfaces of the two molds is set to the thickness of the skin material in the raised state or the thickness of the foam layer of the skin material and the fusion fusion formed by the meshing. It should be approximately the same as the resin thickness.

The above distance is maintained for a certain period of time until the fused resin is molded in a shaped state.

During this time, the fused resin is cured and the synthetic resin molded body is completely molded.

After molding the fused resin, the drive mold is driven again to open the molds, and then the synthetic resin molded body on which the skin material is integrally molded is released.

(Example) Hereinafter, one example of a method for manufacturing a synthetic resin molded body in which a skin material according to the present invention is integrally molded will be described with reference to the drawings.

1 to 4 show the state in which the method of the present invention is being carried out for each step.

The mold used in the method of the present invention is a vertically separated mold having a male mold (1) and a female mold (2).

In this embodiment, the male mold (1) is a fused resin (3) described later.
And the female mold (2) is a mold that directly contacts the skin material (4).

The male mold (1) has at least a convex portion (1a), and its upper surface is a meshing surface (1b).

There is a fixed frame around the male mold (1) with a fixed interval.
(5) is provided.

Further, the skin material fixing frame (5) may be vertically movable by an expansion / contraction device (not shown) such as a spring or an air cylinder.

The female mold (2) has a concave portion (2a) that meshes with the convex portion (1a) of the male mold (1) and also has a meshing surface (2b) that meshes with the meshing surface (1b) of the male mold (1). .

In this embodiment, this female mold (2) is the drive mold, and both molds (1) (2)
When engaging with each other, it is driven from the upper side to the lower side by an elevating mechanism (not shown).

The drive type may be the male type (1), and the positional relationship between the male type (1) and the female type (2) may be upside down from this embodiment.

Next, the steps of the method of the present invention will be described with reference to the line graphs of FIGS. 1 to 4 and 6.

FIG. 1 shows a state in which the male type (1) and the female type (2) are in the initial setting positions (position (11) in the line graph).

At this point, the skin material (4) is already pinned to the skin material fixing frame (5).
It is fixed by (6) or the like and is arranged between the molds (1) and (2).

As the skin material used in the method of the present invention, a woven fabric having naps (7) such as woven wool or pile, and a woven fabric such as woven fabric laminated on a sheet or the like or having a foam layer (not shown) To be done.

Next, the female mold (2), which is a driving mold, is lowered by the lifting mechanism, and during this time (arbitrary time from (11) to (12) in the line graph)
From the fused resin path (not shown) to the fused resin (3)
Are supplied between the convex portion (1a) of the male mold (1) and the back surface of the skin material (4). (Refer to FIG. 2) Examples of the fused resin used in the method of the present invention include thermoplastic elastomers such as polypropylene, polyethylene, polystyrene, acrylonitrile-styrene-butadiene block copolymer, and styrene-butadiene block copolymer. Expandable or expandable resins, and inorganic fillers, fillers such as glass fibers, pigments,
Examples thereof include those containing additives such as lubricants and antistatic agents.

Then, as shown in the third drawing, a synthetic resin molded body is formed in which the molds (1) and (2) are engaged with each other to integrally mold the skin material (4).

Even when the skin material (4) has an extra length when the two molds (1) and (2) are engaged with each other, the male mold (1) and the skin material fixing frame (5) are During this period, the surplus length portion of the skin material (4) bends, and a good synthetic resin molded body without wrinkles and the like can be molded.

The meshing time (time at position (12) in the line graph)
(m)) is the minimum required shaping time.

The minimum required shaping time (m) is that the skin material (4) is fused resin (3)
Fused resin that is bonded to the skin and the skin material (4) is bonded
This is the minimum time required for imparting a predetermined shape to (3) by the engagement of both molds (1) and (2).

The specific minimum required shaping time (m) depends on the type of skin material and other conditions, but it is required that the skin material be restored to the standing state at least after the disengagement.

The present inventors conducted an experiment in which a fabric having naps was used as a skin material and integrally molded with a fused resin (3), and the following results were obtained.

When the meshing time was 5 seconds, the nap was immediately restored to the standing state after the meshing was released.

When the meshing time was 10 seconds, some dislocation was observed after the meshing was released.

When the engagement time was 30 seconds, the nap was completely laid down and was not restored to the standing state even after the engagement was released.

From the above results, it is considered that the engagement time of both types (1) and (2) should be within 10 seconds.

Similar results were obtained when a propylene foam single layer, a propylene foam-vinyl chloride sheet laminate, or a laminate of propylene foam and a fabric having a raised fabric was used as the skin material.

That is, when the meshing time is within 10 seconds, the texture of the foam layer of these skin materials can be maintained.

The minimum required shaping time (m) is required to satisfy the condition that the fused resin (3) to which the skin material (4) is stuck is shaped within this time.

After this engagement, the female die (2) is slightly raised.

As shown in FIG. 4, the distance between the mating surfaces (1b) and (2b) of both molds (1) and (2) is the thickness of the skin material (4) raised in the raised state (7) or the foamed layer is foamed. The rise of the female die (2) is stopped at a position where the sum of the thickness and the thickness of the synthetic resin formed by the meshing is approximately the same for a certain time (the time at the position (13) in the line graph).
(n)) Allow to pass.

The reason why the rise of the female mold (2) is temporarily stopped at the position (13) is to complete the moldability of the synthetic resin.

That is, when the molds (1) and (2) are opened immediately after meshing, the fused resin (3) that has been shaped but not yet cured oozes out from the end of the synthetic resin molded body. It may lose its shape.

However, if the rising of the female die (2) is stopped at the position (13) for a certain time (n), the skin material is made to move by the mating surfaces (1b) and (2b) of both die (1) and (2).
The fused resin can be cured while maintaining the shape of the synthetic resin molded body in which (4) is integrally molded, and a synthetic resin molded body having perfect moldability can be obtained.

This fixed time (n) varies depending on conditions such as the type of fused resin, but according to the experiments conducted by the present inventors, it is about 10 to 60 seconds.

In addition, when the female shape (2) is set to the position (13), the nap (7) of the skin material (4) is restored to the standing state, and when the skin material has a foam layer, the foam layer is good. It maintains a nice texture.

After a certain period of time (n), both molds (1) and (2) are opened,
Both molds (1) (2) return to the initial setting position (11).

Then, the synthetic resin molded body integrally molded with the skin material is released from the mold.

The synthetic resin molded body (10) integrally molded with the skin material (4) molded as described above has perfect moldability of the synthetic resin (9) as shown in FIG. 5, and the raised hair (7) is raised. It is a molded product having an excellent appearance in which the state or foam layer has a good texture.

(Effect of the Invention) The present invention comprises a synthetic resin molding die having a male die and a female die, and a skin material fixing frame provided at a constant interval in the vicinity of the male die. A method for manufacturing a synthetic resin molded body in which a skin material is integrally molded by engagement between a male mold and a female mold, wherein a male mold and a female mold are fixed after fixing a peripheral edge of the skin material to the skin fixing frame. The meshing time for meshing and sticking the skin material to the fusion-bonded resin is limited to the minimum required shaping time, and after this meshing, the distance between the meshing surfaces of the two molds is the raised state of the skin material. Thickness or the thickness of the foamed layer of the skin material and the sum of the thickness of the fused resin formed by the meshing, and the same for a certain period of time, the synthetic resin for integrally molding the skin material. Since it is a method for producing a molded body, the following effects are exhibited.

That is, since the meshing time for sticking the skin material to the fused resin is only the minimum required shaping time, when the skin material has a raised or foamed layer, this raised or foamed layer has a mold. The pressing time can be shortened as much as possible, so that the raised hair which has been laid down after the two molds are engaged with each other is restored to an upright state, or the foam layer that has been deformed under pressure has a good texture.

This makes it possible to manufacture a synthetic resin molded body in which the raised hair is raised or the foamed layer maintains the texture and the skin material having an excellent appearance is integrally molded.

Moreover, after the disengagement of both molds, the distance between the mating surfaces of both molds is set to be approximately the same as the thickness of the skin material in the raised state or the foamed thickness of the foam layer, so that a certain period of time elapses. , It is possible to manufacture a synthetic resin molded body in which the skin material is integrally molded at a low pressure at the time of shaping, and the synthetic resin to which the skin material is attached is maintained in the shaped form until the fused resin is cured and molded. Therefore, it is possible to manufacture a synthetic resin molded body which is excellent in moldability and in which the skin material is integrally molded.

Further, since the skin material fixing frame is provided in the vicinity of the male mold at a constant interval, the male mold and the female mold are engaged with each other after fixing the peripheral portion of the skin material to the skin material fixing frame. Even if there is an extra length in the skin material when these two molds are engaged, this part gets between the male mold and the skin material fixing frame, and good synthetic resin molding without wrinkles etc. The body can be shaped.

[Brief description of drawings]

1 to 4 are cross-sectional views of main parts showing respective steps of the method of the present invention, FIG. 5 is a cross-sectional view of a synthetic resin molded body integrally molded with a skin material manufactured by the method of the present invention, and FIG. A line graph showing the relationship between the transition of time and the distance between the male and female mating surfaces in the method of the present invention, and FIGS. 7 (A) and 7 (B) show a conventional synthetic resin molded body integrally molded with a skin material. FIG. 8 is a sectional view of a main part showing the steps of the manufacturing method, and FIG. 8 is a sectional view of a synthetic resin molded body integrally molded with a skin material manufactured by a conventional manufacturing method.
FIG. 9 is a line graph showing the relationship between the transition of time and the distance between the mating surfaces of the male mold and the female mold in the conventional method for manufacturing a synthetic resin molded body in which a skin material is integrally molded, and FIG. FIG. 6 is an explanatory view showing steps of a method for manufacturing a synthetic resin molded body that integrally molds the skin material. (1) …… Male type, (2) …… Female type (1b) …… Male type mating surface, (2b) …… Female type mating surface (3) …… Fused resin, (4) …… Skin material (7) …… Raised, (9) …… Synthetic resin (10) …… Synthetic resin molded body in which skin material is integrally molded (m) …… Mating time of both molds, (n) …… A certain time

Claims (1)

[Claims] 1. A male mold for a synthetic resin molding, comprising a synthetic resin molding mold having a male mold and a female mold, and a skin material fixing frame provided near the male mold at a constant interval. A method for manufacturing a synthetic resin molded body integrally molding a skin material by meshing with a female mold, wherein a male mold and a female mold are meshed after fixing a peripheral edge portion of the skin material to the skin material fixing frame, The meshing time for bonding the skin material to the fused resin is only the minimum required shaping time, and after this meshing, the distance between the meshing surfaces of the two molds is the thickness of the skin material in the raised state. Alternatively, a synthetic resin molded body for integral molding of a skin material, characterized in that the thickness of the foam layer of the skin material and the thickness of the fused resin formed by the meshing are made to be approximately the same for a certain period of time. Method.