JPH09309118A - Molding die for different hardness cushion body and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture simply a different hardness cushion body of good quality by forming rotatably upward a bar protruding from a cavity wall face of a bottom force and retaining a bag or a film in a cavity by the bar. SOLUTION: A cavity 12 corresponding to the shape of a desired cushion body is formed on a bottom force 11, and both sides of a rear wall face 13 of the cavity 12 are formed into separating walls 13a separated from other sections. Two bars 16 as a unit almost in parallel each other and protruding forward into the cavity 12 are fixed on the base section side 16a on the separating walls 13a on both sides. The bars 16 are rotated upward together with the separating walls 13a, and when the separating walls 13a are returned into the cavity 12, the bars are retained almost in the horizontal state being separated from a cavity bottom face 14. Plastic film bags are installed on the bars 16 and hung down into the bottom face cavity 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for forming a cushion of different hardness having a partially different hardness, and a method for manufacturing a cushion of different hardness, which is performed using the mold.

[0002]

2. Description of the Related Art For example, in a seat 80 of an automobile as shown in FIG. 18, a cushion body made of polyurethane foam or the like is used as a seat portion 81 and a backrest 82 covered with a skin. Further, as the cushion body used for this seat, a different hardness cushion body having partially different hardness is preferable from the viewpoints of the occupant's holdability and the ease of getting on and off. FIG. 19 shows the different hardness cushion body 83, which is used for the seat portion 81. In this different hardness cushion body 83, high hardness foams 84a are embedded in both side portions 84 thereof, and the surfaces of both side portions 84 and the central portion 85 are low hardness foams softer than the high hardness foams 84a. It is configured.

As a simple method for manufacturing the different-hardness cushion body, a plurality of foaming raw materials which become foams having different hardnesses are separately injected into the cavity of the molding die, and the hardness formed by both foaming raw materials is injected. The method of integrally foaming different foams, or placing a foam pad made of high-hardness foam in advance in a predetermined position in the mold, injecting a low-hardness foaming raw material into the mold, and then foaming There is a method of integrating a low hardness foam formed by the above and the high hardness foam pad.

FIG. 20 shows an example of the former manufacturing method. In this conventional example, a liquid storage container 88 made of expanded polypropylene or expanded polyethylene is held on both sides of the cavity 87 of the lower die 86, and the liquid storage container 88 has a foaming raw material 89 for high hardness and the other parts of the cavity 87 have a low hardness. Foaming raw material 90 for hardness
Is injected and both foaming raw materials are integrally foamed to manufacture a cushion body of different hardness. Reference numeral 91 is an upper mold.

FIG. 21 shows an example of the latter manufacturing method. In this conventional example, a high hardness foam pad 93 is previously attached to both sides of the mold surface of the upper mold 92, while a foaming raw material 96 which is a low hardness foam softer than the foam pad 93 is injected into the cavity 95 of the lower mold 94. Then, the upper mold 92 and the lower mold 94 are closed to manufacture a different hardness cushion body in which the low hardness foam formed from the foaming material 96 and the high hardness foam pad are integrated.

[0006]

However, according to the former manufacturing method, since the end of the liquid storage container 88 is held by being sandwiched by the parting surfaces (dividing surfaces) 97 of the upper mold 91 and the lower mold 86,
There is a problem that the parting surface 97 is sealed by the holding. That is, the parting surface 97 allows the foaming gas generated during the foaming of the foaming raw material 90, the air trapped in the cavity, and the like to escape to the outside, so that the foaming raw material 90 can be discharged.
Also has a role of completely filling the cavity, so that the foamed gas or the like is trapped in the cavity when sealed as described above, so that the cushion layer of different hardness is apt to be lacked. Further, the rigidity of the liquid storage container 88 may cause an uncomfortable feeling when the cushion body of different hardness is used.

On the other hand, according to the latter method, the foam pad 9
Since the foaming raw material 96 is impregnated in 3 to form a hard film, the resulting different hardness cushion body gives the user a feeling of strangeness due to the hard film on the surface of the foam pad 93 (boundary surface with the low hardness foam). There is.

Although not shown in the drawings as another method for manufacturing the cushion of different hardness, the partition of the cavity is divided by a partition provided on the bottom surface of the cavity, and different foaming raw materials are injected into the respective compartments to form the cushion of different hardness. There is also a method of foam molding. However, according to the method, the obtained different hardness cushion body has a deep groove formed by the partition on the surface, so that the seating feeling is inferior and wrinkles occur on the skin covered with the different hardness cushion body. There's a problem.

The present invention has been made in view of the above points, and provides a mold for easily manufacturing a high-quality different hardness cushion body and a method of manufacturing the different hardness cushion body using the mold. is there.

[0010]

First, an invention relating to a mold for a cushioning body of different hardness is shown in claims 1 and 2. The invention of claim 1 provides a molding die for foam-molding different hardness cushion bodies having partially different hardness,
A rod-shaped body projecting from the cavity wall surface of the lower mold into the cavity is rotatably attached to the cavity wall surface at the base side so that a bag or a film can be held in the cavity by the rod-shaped body. Characterize. Further, the invention of claim 2 is the rod-shaped body of claim 1,
Instead of being rotatable upward, it is inserted into the wall surface of the cavity so that it can be pulled out.

On the other hand, an invention relating to a method of manufacturing a cushion body of different hardness is described in claims 3 to 6. The invention according to claim 3 uses the molding die according to claim 1 and a bag made of a plastic film having an upper opening, and has the following configuration. That is, the invention of claim 3 is
A plurality of foaming raw materials that become foams having different hardnesses are separately injected into the cavity of the lower die of the molding die, and in a method of manufacturing a different hardness cushion body in which foams having different hardnesses are integrally foam-molded, A rod-shaped body protruding from the cavity wall surface of the lower mold into the cavity is formed by using a molding die that is rotatably rotated upward and is attached to the cavity wall surface on the base side.
A plastic film bag having an opening at the top and a hole formed at the edge thereof is hung in the cavity of the lower mold by passing the rod-shaped body through the hole, and different foaming raw materials are provided inside and outside the bag of the cavity. To form a different hardness cushion body in which foams of different hardness are integrated, and then the molding die is opened to lift the different hardness cushion body together with the rod-shaped body from the lower mold, It is characterized by being extracted from the rod-shaped body.

The invention of claim 4 uses the molding die of claim 2 and a bag made of a plastic film having an upper opening. That is, in the invention of claim 4, a plurality of foaming raw materials which become foams having different hardnesses are separately injected into the cavity of the lower die of the molding die, and the foams having different hardnesses are integrally foam-molded. In a method for manufacturing a hardness cushion body, a rod-shaped body protruding from a cavity wall surface of a lower die into the cavity is formed by using a molding die that is removably inserted into the cavity wall surface, and an opening is formed at an upper side of the cavity. The formed plastic film bag is hung in the cavity of the lower mold by passing the rod-shaped member through the hole, and different foaming raw materials are injected into the cavity bag and outside the bag,
Foaming a different hardness cushion body in which foams of different hardness are integrated, pulling the rod-shaped body outward of the wall surface of the lower mold and extracting from the cavity of the lower mold during or after the foaming, It is characterized in that the hardness cushion body is taken out from the molding die.

On the other hand, the invention of claim 5 is a method using the mold, foam pad and plastic film of claim 1. That is, in the invention of claim 5, a foaming pad is placed at a predetermined position on the bottom surface of the lower mold cavity of the molding die, and a foaming raw material that becomes a foam having a hardness different from that of the foaming pad is injected into the cavity. In a method of manufacturing a different hardness cushion body in which a foam formed from the foam raw material and the foam pad are integrated, projecting from a cavity wall surface of a lower mold to both edges of the foam pad in the cavity. A rod-shaped body that becomes rotatably upward is mounted on the bottom surface of the lower mold cavity by using a molding die that is attached to the cavity wall surface at the base side, and then holes are formed on both edges. A plastic film is placed on the upper surface of the foam pad by passing a rod-shaped body through the hole, and then a foam material having a hardness different from that of the foam pad is injected into the lower mold cavity to form the foam. After forming a different-hardness cushion body in which a foamed body formed by foaming a material and the foam pad are integrated, the molding die is opened and the different-hardness cushion body is lifted together with the rod-shaped body from the lower mold, and the different-hardness cushion is formed. The feature is that the body is extracted from the rod-shaped body.

The invention of claim 6 is a method of using the mold, foam pad and plastic film of claim 2. That is, in the invention of claim 6, a foaming pad is placed at a predetermined position on the bottom surface of the lower mold cavity of the molding die, and a foaming raw material that becomes a foam having a hardness different from that of the foaming pad is injected into the cavity. In a method of manufacturing a different hardness cushion body in which a foam formed from the foam raw material and the foam pad are integrated, projecting from a cavity wall surface of a lower mold to both edges of the foam pad in the cavity. The rod-shaped body to be used, using a mold that is detachably inserted into the wall surface of the cavity, after placing a foam pad on the bottom surface of the lower mold cavity, a plastic film with holes formed on both edges, The rod-shaped body is passed through the hole and placed on the upper surface of the foam pad. Then, a foam raw material having a hardness different from that of the foam pad is injected into the lower mold cavity to foam from the foam raw material. Forming a different-hardness cushion body in which the formed foam body and the foam pad are integrated, and pulling the rod-like body outward of the wall surface of the lower mold during or after the foaming of the foaming raw material, and from the cavity of the lower mold. It is characterized in that the different-hardness cushion body is taken out from the forming die after that.

[0015]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the accompanying drawings. 1 is a cross-sectional view of an embodiment of the molding die described in claim 1, FIG. 2 is a plan view of a lower die of the embodiment,
FIG. 3 is a perspective view showing the vicinity of a rod-shaped body of a lower die in the same embodiment, and FIG. 4 relates to an example of a method of manufacturing a cushion with different hardness using the forming die of FIG. 1, showing a state in which the bag body is suspended in the cavity. FIG. 5 is a vertical cross-sectional view of the forming die shown in FIG. 5, FIG. 5 is a plan view of the lower die after the foaming raw material is injected in the same embodiment, and FIG. FIG. 6 is a vertical cross-sectional view of the molding die showing the different hardness cushion body taken out in the same example.

FIG. 8 is a perspective view showing another example of the plastic film bag when assembled, and FIG. 9 is a perspective view of the plastic film bag of the embodiment. Further, FIG. 10 is a perspective view showing the main part of another example of the molding die of claim 1, FIG. 11 is a cross-sectional view taken along line 11-11 of FIG. 10, and FIG. 12 shows the base side of the rod-shaped body in the same embodiment. It is a perspective view.

FIG. 13 is a perspective view showing the vicinity of attachment of a rod-shaped body for an example of the molding die of claim 2, and FIG. 14 is an example of a method for manufacturing a cushion of different hardness using the molding die of FIG. FIG. 15 is a vertical cross-sectional view of the molding die showing time, and FIG. 15 is a vertical cross-sectional view of the molding die showing extraction of the rod-shaped body in the embodiment.

Further, FIG. 16 shows claims 5 and 6.
FIG. 17 is a horizontal cross-sectional view of a molding die showing a process of manufacturing the different hardness cushion body of FIG. 17, and FIG. 17 is a cross sectional view of the different hardness cushion body obtained in the same example.

First, an example of the molding die according to claim 1 and the method for manufacturing the different hardness cushion body according to claim 3 using the molding die will be described. The molding die 10 shown in FIGS. 1 to 3 includes a lower die 11 and an upper die 21 that covers the lower die 11 and is used for foam-molding a different hardness cushion body having high hardness portions on both sides. The different-hardness cushion body is for a seat of a car seat.

A cavity 12 corresponding to a desired cushion body shape is formed in the lower mold 11. The cavity 12 forms a foaming space for the foaming raw material together with the upper mold 21. As for the wall surface 13 on the rear side of the cavity 12 (the side corresponding to the rear side of the seat), the cavity bottom surface 1 is located at a position separated from the rear outer wall 11a of the lower mold 11 by a predetermined amount.
It has been erected from 4. Further, the rear wall surface 13 of the cavity is a plate-shaped separation wall 13a whose both sides (edges) are separated from other parts, and is provided on the outer surface (opposite side of the cavity) of the separation wall 13a. It is attached to the bottom surface 11b of the lower mold 11 so as to be rotatable upward by the hinge 15 structure. In addition, in the normal state (when returned to the inside of the cavity 12), the separation wall 13a is a part 13 of the rear wall surface 13 where the bottom portion 13b is located below the bottom portion 13a.
It abuts c and is maintained substantially perpendicular to the cavity bottom surface 14 as shown in FIG. 3 to form a series of rear wall surfaces 13.

A pair of substantially parallel rod-like bodies 16 projecting forward (in the seat front side) into the cavity 12 are fixed to the separation walls 13a on both sides at the base side 16a. Then, the rod-shaped body 16 rotates upward together with the separation wall 13a, and the separation wall 13a is moved to the cavity 12
When returned to the inside, it is held in a substantially horizontal state apart from the cavity bottom surface 14. The rod-shaped body 16 is preferably made of a metal solid or hollow body, and has a diameter of 6-12.
It is generally about mm.

The rod-shaped body 16 has two separating walls 13a.
It is not necessary to provide them in the same state. For example, as shown in FIG. 6 showing a cross section of the molding die 10 at the time of manufacturing the different hardness cushion body, the intervals and heights of the rod-shaped bodies 16, 16 on the left side and the right side of the lower die 11 are different, or not shown. May have different lengths. It is appropriately determined according to the size of the plastic film bag 25 attached to the rod-shaped body 16, that is, the size of the high hardness portion to be formed.

Further, in this embodiment, two rod-like bodies 16 are provided as one set, and one set is provided on each of the left and right sides in the cavity 12 of the lower mold 11, but the high hardness provided on the different hardness cushion body is provided. Depending on the number (position) of the parts, there may be one set or three or more sets. Also, the number of rod-shaped bodies 16 may be one set or three or more depending on the structure of the plastic film bag 25 described later.

The upper die 21 constitutes the lid of the lower die 11,
The hinge 23 is attached to the lower mold 11 so as to be openable and closable on the rear side thereof. In some cases, the upper die 21 may not be connected to the lower die 11 by a hinge and may be separated.

Next, it is carried out by using the molding die 10.
Regarding the method of manufacturing the different hardness cushion body described in,
The embodiment will be described. First, with the molding die 10 opened, as shown in FIGS. 3 and 4, the rod-shaped body 1
A plastic film bag 25 is attached to 6 and is suspended in the lower mold cavity 12. The attachment work of the bag 25 is performed by rotating the rod-shaped body 16 upward so as to incline so that the front side is upward, and then rotating the film support rod 16 together with the bag 25 downward to form the cavity 12.
It is preferable to put it back inside. Further, it is preferable to apply a release agent to the rod-shaped body 16 in advance so as to prevent the foaming raw material to be injected into the cavity 12 from adhering.

The bag 25 is a plastic film formed into a predetermined shape by welding or the like and has an upper opening, and cylindrical holes 26 are formed at opposite edges of the opening. Then, the rod-shaped body 16 is passed through the hole 26, and the bag 25 is suspended in the lower mold cavity 12.
The size and shape of the bag 25 are appropriately determined according to the size and shape of the high hardness portion provided on the different hardness cushion body.
In this embodiment, one of the two bags 25 arranged on both sides of the cavity 12 is smaller than the other.

The plastic film forming the bag 25 is preferably flexible because the bag 25 is embedded in the cushion of different hardness, and a thin film having a thickness of about 30 μm to 1 mm is suitable. Further, the plastic film is preferably a urethane-based hot melt film or the like that has adhesiveness to a foam formed by foaming inside and outside the bag 25 and is heat-sealed.

It is not necessary that all the parts of the bag 25 be made of one sheet or a plastic film made of the same material. Like the plastic film bag 35 shown in FIGS. 9 and 10, holes are formed at both ends. The strip-shaped plastic sheet 37 on which 36 is formed may be adhered or fused to the opposite edges 38a, 38a in the opening 38 of the bag 35.

Next, as shown in FIG. 5, the foaming raw material P1 for high hardness is injected into the bag 25, and the foaming raw material P2 for low hardness is injected into the other part of the lower mold cavity 12, respectively.
The lower mold 11 is covered with. The foaming raw material P1 for high hardness
The hardness of the foam formed by the foaming is higher than the hardness of the foam formed from the foaming raw material P2 for low hardness, and it is preferable to use polyurethane foaming raw materials having different formulations. is there. Of course, different types of foaming raw material P1 for high hardness and foaming raw material P2 for low hardness may be used.

The injection amount of the foaming raw material P1 for high hardness is set so as to fill the bag 25 by foaming.
The amount of the low-hardness foaming raw material P2 injected is the amount that fills the other portion of the cavity 12 outside the bag 25 by foaming.

The foaming raw material P1 for high hardness foams and fills the bag 25 as shown in FIG. 6, while the foaming raw material P2 for low hardness fills the cavity 12 outside the bag 25 by foaming. The high hardness foam 31 and the low hardness foam 32 are formed. Then, the foam bodies 31 and 32 are adhered and integrated with each other due to the adhesiveness at the time of foaming, and the different hardness cushion body 3
It becomes 0.

In this example, the injection into the bag 25 and the injection into the other parts of the cavity 12 outside the bag 25 were performed substantially at the same time. First, the foaming raw material P1 for high hardness is injected into the bag 25. To foam, and then the foaming material P2 for low hardness is packed in the bag 2
It may be injected into another portion of the cavity 12 outside the cavity 5.

After foaming the different hardness cushion body 30, as shown in FIG. 7, the molding die 10 is opened and the different hardness cushion body 30 is taken out of the molding die 10. First, the different hardness cushion body 30 is attached to the rod-shaped body 16 to take it out.
At the same time, it is rotated upward and lifted from the lower die 11, and in that state, the different hardness cushion body 30 is pulled forward of the molding die 10 and pulled out from the rod body 16.

In this different hardness cushion body 30,
Since both side portions 30a of the seat portion are harder than the central portion 30b of the seat portion due to the presence of the high hardness foam 31, the seat portion central portion 30b on which the occupant mainly sits has a low hardness. Since it is made of the foamed material 32, the seating feeling is also good. The different hardness cushion body 30 manufactured in this manner is then covered with the epidermis and used.

Further, the rod-shaped body 16 is not limited to the structure of the above-mentioned embodiment, but may be any one that can rotate upward with the base side as a fulcrum. 10 and 11 show another example of the rod-shaped body 4.
1 shows a part of a lower mold 45 provided with 1. Rod-shaped body 41 of this example
As can be better understood from FIGS. 11 and 12, the lower mold 45 includes a base 41a and a rod body 41b.
A base portion 41a is fixed to the cavity wall surface 47 of the base body 41, and a rod main body 41b is pivotally attached to the front end of the base portion 41a so as to be rotatable upward and not to be rotated below substantially horizontal.

Next, an example of the molding die according to claim 2 and the method of manufacturing the different hardness cushion body according to claim 4 using the molding die will be described. FIG. 13 shows an example of the molding die described in claim 2, and is a perspective view showing a part of a lower die 51 of the molding die 50. 14 and 15 are cross-sectional views showing a cushioning body of different hardness using the mold 50. Molding die 50 of this embodiment
Consists of a lower mold 51 and an upper mold 52, and has the same structure as the molding mold 10 shown in FIG. 1 except that the rod-shaped body 56 does not rotate.

In the molding die 50, a pair of holes 54 penetrating the inside and outside of the cavity are formed in each of the wall surfaces 53a near both sides (edges) of the rear portion of the cavity 53 of the lower die 51 and the cavity bottom surface 53b.
A pair of substantially parallel rod-like bodies 56 corresponding to the holes 54 of each pair are detachably inserted and are held in the cavity 53 substantially horizontally apart from the cavity bottom surface 53b. It was made possible.

In the method for manufacturing a cushion body of different hardness using this molding die 50, the bag 25 is inserted into the cavity 53 by inserting the rod-shaped body 56 into the hole 26 of the bag 25 shown in FIG. Hang on. Then, as shown in FIG. 14, the foaming raw material 5 for high hardness is placed in the bag 25.
7. The low-hardness foaming raw material 58 is injected into the other part of the cavity 52 outside the bag 25 to integrally foam each. that time,
During or after the foaming of the foaming raw materials 57 and 58, as shown in FIG. 15, the rod-shaped body 56 is drawn to the outside of the wall surface 53a of the lower die 51 (outside of the forming die) to form the cavity 5.
Remove from 3 and remove from bag 25.

After that, the molding die 50 is opened and the different hardness cushion body 60 is taken out. The foaming raw materials 57, 58
When the rod-shaped body 56 is pulled out after the completion of the bubbling, the rod-shaped body 56 is opened with the molding die 50 open.
You may pull it outward. Reference numeral 59 is a high hardness foam, and 60 is a low hardness foam. The number of the rod-shaped bodies 56 is appropriately determined according to the number of bags used and the like.

Hereinafter, an example of a method of manufacturing the different hardness cushion body according to claims 5 and 6 will be described. Claim 5
Is the molding die of claim 1, and claim 6 is the molding die of claim 2. In order to simplify the explanation,
The examples of claims 5 and 6 will be described in common with FIG. 16. In FIG. 16, those including “A” after the number such as “65A” relate to the mold used in claim 5, and “B” after the number such as “65B”.
The one including is related to the molding die used in claim 6.

First, the molding die 65A used in the embodiment of claim 5 has the same structure as the molding die 10 shown in FIG. 1 and the like, and is fixed to the wall surface of the lower mold 66A at the rear portion of the cavity 68A. The pair of rod-shaped members 72A can rotate upward. Further, the rod-shaped body 72A is provided near the boundaries between both side portions 70A of the cavity bottom surface 69A and the central portion 71A at a predetermined distance from the cavity bottom surface 69A so as to be near both edges of the upper surface of the foam pad 75 described later. There is. Reference numeral 67A is the upper die.

On the other hand, the molding die 65B used in the embodiment of claim 6 is the molding die 5 shown in FIGS. 13 to 15.
With a structure similar to that of 0, a set of two rod-shaped bodies 72B is detachably inserted into the rear wall surface of the cavity 68B of the lower mold 66B so as to be in the vicinity of both edges of the upper surface of the foam pad 75 described later. Both sides 70B of cavity bottom 69B
Is provided in the vicinity of the boundary between the center portion 71B and the center portion 71B at a predetermined distance from the cavity bottom surface 69B. Reference numeral 67B is the upper die.

In the manufacturing method of claims 5 and 6 using the molding dies 65A and 65B, first, the lower dies 65A and 6B are used.
The foam pad 75 is placed on the central portions 71A and 71B of the bottom surface of the cavity 5B, and the rod-shaped body 7 is placed on the top surface of the foam pad 75.
2A and 72B arrange | position the plastic film 76 with which both edges were supported.

The foam pad 75 is provided to soften the feel of the center portion of the seat surface of the different hardness cushion body compared to other portions, and is made of a low hardness foam body having a predetermined thickness. Reference numeral 77 is a protrusion that stands on the bottom surface of the cavity for positioning the foam pad 75. The plastic film 76
Is made of a soft material that can cover the upper surface of the foam pad 75, and is preferably a polyurethane hot melt film having a thickness of about 30 microns to 1 mm. The plastic film 76 has cylindrical holes 76a formed at opposite edges thereof, and the rod-shaped members 72A and 72B are passed through the holes 76a to be held so as to cover the upper surface of the foam pad 75.

After that, a foaming raw material that becomes a foam having a hardness different from that of the foaming pad 75, in this embodiment, a foaming raw material P1 for high hardness is injected into the cavities 68A and 68B of the lower mold and closed to foam. The foamed body (denoted by reference numeral 78a in FIG. 17) and the foamed pad 75 are integrally formed to form a different hardness cushion body in the molding die. And
According to a fifth aspect, the different hardness cushion body is the rod-shaped body 72.
A is lifted together with A from the lower die 66A and pulled out from the rod-shaped body 72A, whereas in claim 6, the rod-shaped body 72B is formed outside the wall surface of the lower die 66B during or after the foaming of the foaming material P1 for high hardness. Pull outside the mold) and pull out from the lower mold 66B.

According to the manufacturing method of the fifth and sixth aspects, when the foaming raw material P1 for high hardness is foamed, the foam pad 75 in the cavity is in a state in which the upper surface thereof is covered with the plastic film 76. Therefore, the foaming material P1 for high hardness does not impregnate the upper surface of the foaming pad 75 (boundary surface with the foam 78a formed from the foaming material), and the cured film is not formed. Therefore, as shown in FIG. 17, the obtained different hardness cushion body 79 does not have a hard film on the boundary surface between the low hardness foam pad 75 and the high hardness foam 78a formed from the high hardness foam raw material P1. , The feel during use becomes good.

[0047]

As shown and described above, according to the mold of the different hardness cushion body of the present invention and the method of manufacturing the different hardness cushion body using the mold, the rod-shaped body provided in the cavity enables the plastic The bag made of film or plastic film is held in the cavity, and the ends of the bag or plastic film are not clamped by the parting surface of the molding die, which prevents gas venting through the parting surface when manufacturing the cushion with different hardness. As a result, it is possible to obtain a different-hardness cushion body having good quality without defects such as lack of meat.

Moreover, according to the mold for the cushion of different hardness of the present invention and the method of manufacturing the cushion for different hardness using the mold, the bag and the plastic film are reliably and correctly held in the cavity by the rod-shaped body. Therefore, it is possible to easily obtain a cushioning body of different hardness having a constant quality. In addition, since the plastic film used as a bag or not used as a bag is flexible, it does not impair the seating feeling of the different hardness cushion body even if it is embedded in the different hardness cushion body. Furthermore, the obtained different-hardness cushion body does not have deep concave grooves on the surface thereof for partitioning the cavity of the molding die, and there is no risk of wrinkles on the skin.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of a molding die according to claim 1.

FIG. 2 is a plan view of the lower mold of the embodiment.

FIG. 3 is a perspective view showing the vicinity of a lower rod-shaped body in the embodiment.

FIG. 4 is a vertical cross-sectional view of the molding die showing a state in which the bag body is suspended in the cavity, regarding an example of the method of manufacturing the different hardness cushion body using the molding die of FIG. 1.

FIG. 5 is a plan view of the lower mold after injection of the foaming raw material in the example.

FIG. 6 is a transverse cross-sectional view of a molding die showing foaming of a foaming raw material in the example.

FIG. 7 is a vertical cross-sectional view of the molding die showing the different hardness cushion body taken out in the same example.

FIG. 8 is a perspective view showing another example of the plastic film bag during assembly.

FIG. 9 is a perspective view of the plastic film bag of the embodiment.

FIG. 10 is a perspective view showing a main part of another example of the molding die according to claim 1;

11 is a sectional view taken along line 11-11 of FIG.

FIG. 12 is a perspective view showing a base portion side of a rod-shaped body in the embodiment.

FIG. 13 is a perspective view showing the vicinity of an attachment portion of a rod-shaped body in an example of the molding die of claim 2;

FIG. 14 is a vertical cross-sectional view of the molding die when foaming, regarding an example of a method for manufacturing a cushion having different hardness using the molding die of FIG. 13.

FIG. 15 is a vertical cross-sectional view of the molding die showing the rod-shaped body when the rod-shaped body is pulled out in the example.

FIG. 16 is a transverse cross-sectional view of a molding die showing an intermediate process of manufacturing an example of the method of manufacturing the different hardness cushion body according to claims 5 and 6;

FIG. 17 is a cross-sectional view of the different hardness cushion body obtained in the same example.

FIG. 18 is a perspective view showing a seat of an automobile.

FIG. 19 is a transverse cross-sectional view showing an example of the different hardness cushion body.

FIG. 20 is a transverse cross-sectional view of a molding die showing a conventional method for producing a cushion body of different hardness.

FIG. 21 is a cross-sectional view of a molding die showing another example of the conventional manufacturing method.

[Explanation of symbols]

 10, 50, 65A, 65B: Mold 11, 51, 66A, 66B: Lower mold 21, 52, 67A, 67B: Upper mold 12, 53, 68A, 68B: Lower mold cavity 13, 47, 53a: Cavity wall surface 16 , 56, 72A, 72B: rod-like body 25: bag made of plastic film 26: hole part of bag 75: foam pad 76: plastic film 76a: hole part of plastic film P1: foaming raw material for high hardness P2: foaming for low hardness material

Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location B29L 31:58

Claims (6)

[Claims] 1. A molding die for foam-molding different hardness cushion bodies having partially different hardnesses, wherein a rod-shaped body protruding into the cavity from a cavity wall surface of a lower die is rotatably upward at the base side. A mold of different hardness cushion body, characterized in that it is attached to the wall surface of the cavity so that the bag or film can be held in the cavity by the rod-shaped body. 2. A molding die for foam-molding different hardness cushion bodies having partially different hardnesses, wherein a rod-shaped body projecting from the cavity wall surface of the lower die into the cavity can be freely extracted into the wall surface of the cavity. A mold for a cushioning body of different hardness, characterized in that the bag or film can be held in the cavity by being inserted through the rod-shaped body. 3. A cushioning body of different hardness, wherein a plurality of foaming raw materials which become foams having different hardnesses are separately injected into a cavity of a lower die of a molding die, and foams having different hardnesses are integrally foam-molded. In the manufacturing method of, the rod-shaped body protruding from the cavity wall surface of the lower die into the cavity is a mold attached to the cavity wall surface at the base side so that it can rotate and rotate upward, and A plastic film bag in which holes are formed is hung in the cavity of the lower mold by passing the rod-shaped body through the holes, and different foaming raw materials are injected into the cavity of the cavity and outside the bag to obtain different hardness. After foaming the different hardness cushion body in which the foam is integrated, the molding die is opened and the different hardness cushion body is lifted together with the rod-shaped body from the lower die to separate the different hardness cushion body from the rod-shaped body. Method of manufacturing a different hardness cushion body, characterized in that the take can. 4. A cushioning body of different hardness, wherein a plurality of foaming raw materials which become foams having different hardnesses are separately injected into a cavity of a lower die of a molding die, and foams having different hardnesses are integrally foam-molded. In the manufacturing method of 1., a rod-shaped body protruding from the cavity wall surface of the lower mold into the cavity is formed by using a molding die that is removably inserted into the cavity wall surface, and an opening is formed on the upper side to form a hole at its edge. The plastic film bag is hung in the cavity of the lower mold by passing the rod-shaped body through the hole, and different foaming raw materials are injected into the cavity bag and outside the bag, and foams of different hardness are integrated. The different-hardness cushion body is foamed and formed, and during or after the foaming, the rod-shaped body is pulled to the outside of the wall surface of the lower mold and extracted from the cavity of the lower mold, and then the different-hardness cushion body is formed. Method for producing a different hardness cushion body characterized by taking out from the mold. 5. A foaming pad is placed at a predetermined position on the bottom surface of the lower cavity of the molding die, and a foaming raw material which becomes a foaming material having a hardness different from that of the foaming pad is injected into the cavity,
In a method for manufacturing a different hardness cushion body in which a foam formed from the foam raw material and the foam pad are integrated, the method comprises projecting from a cavity wall surface of a lower mold to both edges of the foam pad in the cavity. The rod-shaped body, which is rotatably upward, uses a mold attached to the cavity wall surface at the base side, and after placing a foam pad on the bottom surface of the lower mold cavity,
A plastic film with holes formed on both edges is placed on the upper surface of the foam pad through the rod through the holes, and then a foaming raw material having a hardness different from that of the foam pad is injected into the lower mold cavity. After forming a different hardness cushion body in which the foam formed from the foaming raw material and the foam pad are integrated, the molding die is opened to lift the different hardness cushion body together with the rod-shaped body from the lower mold, A method of manufacturing a cushion pad of different hardness, comprising extracting the cushion body of different hardness from a rod-shaped body. 6. A foaming pad is placed at a predetermined position on the bottom surface of a lower mold cavity of a molding die, and a foaming raw material which becomes a foam having a hardness different from that of the foaming pad is injected into the cavity,
In a method for manufacturing a different hardness cushion body in which a foam formed from the foam raw material and the foam pad are integrated, the method comprises projecting from a cavity wall surface of a lower mold to both edges of the foam pad in the cavity. The rod-shaped body is formed by using a molding die that is detachably inserted into the wall surface of the cavity, and after placing a foam pad on the bottom surface of the lower die cavity,
A plastic film having holes formed on both edges is placed on the upper surface of the foaming pad by passing a rod-shaped body through the holes, and then a foaming raw material having a hardness different from that of the foaming pad is injected into the lower mold cavity. Forming a different hardness cushion body in which a foam formed from the foaming raw material and the foaming pad are integrated, and pulling the rod-like body outward of the wall surface of the lower mold during or after the foaming of the foaming raw material. And removing the different hardness cushion body from the molding die, and then removing the different hardness cushion body from the mold.