JP4932534B2 - Polyurethane foam mold - Google Patents

Description

  The present invention relates to a molding die for molding a foam molded body having a groove-shaped recess on the surface, and particularly constitutes a seat seat installed in an automobile or the like, and serves as a seat cushion or a backrest portion serving as a seat portion of the seat. The present invention relates to a foam mold used for forming a seat back.

As shown in FIG. 11, a cushion pad 11 formed by foaming using a polyurethane raw material is used as a cushion pad of a seat cushion 10 that constitutes a seat portion of an automobile seat. On the surface of the cushion pad 11, there is one in which a groove portion is formed in an H shape in a plan view by a front-rear direction groove portion 13 a and a vehicle width direction groove portion 13 b, and a portion adjacent to the groove portion, for example, a front seat portion There is a configuration in which the hardness of 12 and the left and right side portions 15 are different. There are several methods for forming a so-called different hardness cushion pad that is partially different in hardness in this way, and one of them is a partitioning of the bottom surface of the lower mold of the foaming mold, and the adjacent parts separated by the partition. Some of them inject different raw materials of polyurethane. Although this partition does not need to cover the entire height of the cushion pad 11, by providing the partition, polyurethane raw materials having different blends are not mixed, and those having different hardness can be clearly partitioned. This partition may be integrally formed as a protrusion which is a part of the foaming mold, or may incorporate another plate-like body. (Patent Document 1)
Also, an air vent groove is formed in the foaming mold, and air trapped in the mold is discharged from the air vent groove using the foaming pressure of polyurethane, and the polyurethane raw material is applied to a part of the skin material by the air pressure at that time. There is a method for forming a different hardness cushion pad that is intentionally soaked and partially hardened by cured polyurethane. (Patent Document 2)
On the other hand, regardless of whether or not it is a cushion pad of different hardness, the skin material covering the surface of the cushion pad may partially float from the cushion pad surface depending on the uneven curved surface of the cushion pad surface. In order to eliminate this lifting and attach the skin material along the cushion pad, it is necessary to partially attract the surface material to the inside of the pad, and a groove-like recess is formed in the cushion pad to pass the attracting tool May be used. (Patent Document 3)
Japanese Patent Laid-Open No. 2001-70083 JP 54-133570 A Japanese Utility Model Publication No. 61-77900

  In the prior art of Patent Document 1 which obtains a cushion pad of different hardness by injecting foam materials of different blends into predetermined regions and foaming them, depending on the molding conditions, air or gas generated with foaming (hereinafter referred to as air or the like) ) May be involved, and there is a problem that a lacking part or the like is formed in the foam molded product. For urethane raw materials blended for various purposes, there are appropriate conditions for the injection amount corresponding to the shape and size of the mold and the injection pattern to the lower mold, but foam molds of multiple shapes and dimensions are mixedly mounted In a molding line, it may be necessary to employ conditions that are not appropriate. In particular, in the injection of a low-density urethane raw material, since the injection amount is small, the injection time is short, and an injection pattern that requires a certain amount of time is difficult to adopt and often cannot be an appropriate injection form. In order to solve this, it is conceivable to install a polyurethane raw material injection machine corresponding to each foaming mold, but this is difficult in terms of equipment.

  A phenomenon in which a thinned portion is formed by being injected and foamed under such an inappropriate condition will be described with reference to FIGS. The injected polyurethane raw material spreads outward from the injection point on the central bottom surface 33 of the lower mold. Single-point injection is often performed under molding conditions that are not appropriate, and the single-point-injected polyurethane material spreads almost concentrically. The polyurethane raw material injected at this time starts to increase in viscosity during the foaming process, and when it reaches the corner 23 formed by the front-and-rear direction protrusion 21a, the vehicle width-direction protrusion 21b and the center bottom 33, air or the like is discharged. It will be contained in the corner 23. As a result, a space that is not filled with the foam is formed at the corner 23, and the lacking portion 14 is formed in the foam 25 as shown in FIG.

  Moreover, in the molding method of the different hardness cushion pad of the prior art of Patent Document 2 in which the polyurethane raw material is intentionally soaked in a part of the skin material and the hardness is partially increased by the cured polyurethane, Even if the formation can be prevented, another problem arises in that the surface feel is uncomfortable although the hardness is different. Moreover, even if the skin material has air permeability, the air permeability is lowered in the portion in which the polyurethane is infiltrated.

  On the other hand, in order to prevent partial lifting of the skin material covering the surface of the cushion pad, it is necessary to partially attract the surface material to the inside of the pad. In the groove portion formed as described above, problems such as lack of thickness also occur.

  The present invention eliminates the above-mentioned problems of the prior art, and even if a groove portion that partially intersects the lower mold of the foam mold and the groove recess portions that intersect each other are formed on the cushion pad surface, An object of the present invention is to provide a foam molding die for molding polyurethane foam that can prevent the formation of a lacking portion at the corner of the foam facing the intersection.

  In order to solve the above-mentioned problems, the invention of the polyurethane foam mold according to claim 1 is provided with an intersecting protrusion on the bottom surface of the lower mold in order to form a groove-like recess intersecting the surface of the polyurethane foam. The foaming mold is characterized in that a groove is provided at the base of the ridge, extending along the ridge, and intersecting at the intersection of the ridge.

According to a second aspect of the present invention, in the polyurethane foam mold according to the first aspect, the groove is extended to a parting surface of the lower mold.
The invention according to claim 3 is the polyurethane foam mold according to claim 1 or 2, wherein the protrusion is a plate-like protrusion incorporated into the bottom surface of the lower mold of the foam mold. To do.

  According to a fourth aspect of the present invention, in the polyurethane foam mold according to the third aspect, the plate-shaped protrusion has a thickness transition portion that increases the thickness below the bottom surface of the lower mold. A part of the groove is formed by the length change portion.

  The invention according to claim 5 is the root of the ridge portion at the intersecting portion formed by the intersecting ridge portion in the polyurethane foaming mold according to any one of claims 1 to 4. It is characterized in that a groove extending to the upper end of the protrusion is provided.

  According to a sixth aspect of the present invention, in the polyurethane foam mold according to any one of the first to fifth aspects of the present invention, the groove is formed by the intersecting ridge portion among the both side surfaces of the ridge portion. It is characterized in that it is formed at the base of the side surface including the formed intersection.

(Function)
In the present invention, since the groove is formed at the base of the projecting portion standing on the bottom surface of the lower mold of the foam molding die, the injected polyurethane raw material reaches the root portion and escapes upward from air or the like. Even if it is blocked, air or the like is quickly discharged to the other part of the bottom surface of the lower mold center where the polyurethane raw material is not covered through the groove. Therefore, the air at the base of the ridge is diffused without being collected at the corner formed by the intersecting ridge and the central bottom surface. Also, under the molding conditions in which the polyurethane raw material reaches the base of the ridge part with a relatively low viscosity, the polyurethane raw material flows faster than the other part of the bottom surface of the lower mold center through the groove, and the overall flow speed is increased. It reaches the corner formed by the protruding ridge and the central bottom surface that intersect before the foaming reaction. Therefore, the polyurethane raw material covering the entire center bottom surface foams and expands without involving air or the like. Therefore, there is no case where the foamed portion is formed by the air or the like confined in the corner.

  According to the present invention, in order to prevent mixing of injection materials having different compositions in molding of a different hardness cushion pad, and to draw a skin material on the surface of the cushion pad, even if a groove-like recess is formed on the surface of the cushion pad, the surface side is lacking. The occurrence of meat parts can be prevented.

(First embodiment)
Hereinafter, a first embodiment in which the present invention is embodied in a foam mold for molding a cushion pad of an automobile seat seat will be described with reference to FIGS. The cushion pad 11 molded in the first embodiment has substantially the same configuration as the cushion pad 11 described in the background art, and the same components are denoted by the same reference numerals and description thereof is omitted. Or it simplifies.

  That is, FIG. 5 shows a cushion pad 11 of a seat cushion that becomes a seat portion of an automobile seat, which is the same configuration as the cushion pad 11 shown in FIG. 11 except that the lacking portion 14 does not exist. However, as will be apparent from the description below, a convex portion may be formed on the edge of the concave groove portion on the surface of the cushion pad 11 depending on the cross-sectional shape and dimensions of the root groove, but this convex portion is not shown in the figure. To do.

FIG. 1 is a perspective view showing a protrusion provided on the lower mold 30 of the foam molding die in an H shape in plan view, and FIG. 2 is a perspective view showing the vicinity of the root of the portion where the protrusion of the lower mold 30 of the foam molding die intersects. FIG.
Most of the lower mold 30 of the foam mold shown in FIG. 1 is the same as the foam mold for molding a cushion pad of different hardness in the prior art, and the front and rear direction groove 13a and the vehicle width direction groove 13b are formed in the cushion pad 11. For this reason, the protruding ridges are arranged in a substantially H shape in a plan view by a pair of left and right ridges 21a and 21b in the vehicle width direction. Further, the bottom surface of the lower mold 30 is divided into a pair of front and rear central bottom surfaces 33 and a pair of left and right side bottom surfaces 34 by the substantially H-shaped front and rear direction protrusions 21a and the vehicle width direction protrusions 21b. The protrusions in the present embodiment are integrally formed with the lower mold 30 made of an aluminum alloy or the like. In this figure, the groove provided at the base of the protruding portion 21 according to the embodiment of the present invention is shown as a groove extending on the rear slope 35 and continuing to the parting surface.

  As shown in FIG. 2, the front-and-rear direction protrusion 21 a and the vehicle-width-direction protrusion 21 b form an intersection 24, and the front and rear where the inner side surface 22 a and the center bottom surface 33 of the front-rear direction protrusion 21 a intersect. A root groove 26 extending along the front-rear direction protrusion 21a is formed at the root of the direction protrusion 21a. Further, a root groove 26 extending along the vehicle width direction ridge portion 21b is also formed at the root portion of the vehicle width direction ridge portion 21b where the inner side surface 22b and the center bottom surface 33 of the vehicle width direction ridge portion 21b intersect. Is formed. The root groove 26 intersects at the intersection of the front-rear direction protrusion 21a and the vehicle width direction protrusion 21b in the same manner as the intersection of the front-rear direction protrusion 21a and the vehicle width direction protrusion 21b. Further, as shown in FIG. 1, the root groove 26 at the root of the front-and-rear ridge 21a extends on the slope 35 on the rear side of the mold surface and continues to the parting surface 30a. Although not shown in FIG. 1, the root groove 26 is also provided on the front inclined surface 35 so as to be continuous with the parting surface 30a. In the present embodiment, the cross-sectional shape of the root groove 26 is V-shaped. In FIG. 4, reference numeral 40 denotes an upper mold of the mold.

Next, the foam molding using the foam mold according to the present embodiment and the behavior of the polyurethane raw material at that time will be described with reference to FIGS.
3, H1 indicates the position of the injection head for injecting the polyurethane raw material into the central bottom surface 33, and H2 indicates the position of the injection head for injecting the polyurethane raw material into the side bottom surface 34. In recent molding lines, a plurality of injection heads are not necessarily used, and only one injection head is used, and polyurethane raw materials of different blending are often injected. Further, in this figure, H1 is drawn at two places, and this shows a state of injection while moving between two points. However, in the present embodiment, the effect is particularly exerted in the case of molding conditions in which injection while moving is not adopted.

  FIG. 4 shows a state in which the polyurethane raw material injected into a required location in the foaming mold in which the upper mold 40 is closed foams and fills the cavity. FIG. 5 shows a cushion pad 11 that is a foam that has been demolded after a required curing time.

  In FIG. 6, the polyurethane raw material injected into one point of the central bottom surface 33 flows toward the corner portion 23 formed by the longitudinal ridge portion 21a, the vehicle width direction ridge portion 21b and the central bottom surface 33 of the lower mold 30. It is a figure which shows the condition on the way to reach in simulation. Moreover, this figure has shown the condition in the molding conditions in which the injected polyurethane raw material reaches near the corner 23 before increasing its viscosity. In FIG. 6, the polyurethane raw material (shown by a black arrow) that flows through the root groove 26 at the base of the front-rear direction protrusion 21 a and the vehicle width direction protrusion 21 b (shown by a black arrow) flows on the other central bottom surface 33 (with an open arrow). Flows faster than shown). Therefore, the front 41 of the polyurethane raw material is almost the same as the whole or the front 41 near the root groove 26 reaches the corner 23 a little faster, and before the foaming progresses through the cream time, the entire central bottom 33 is made of the polyurethane raw material. It will be covered with. In such a state, expansion due to foaming progresses almost uniformly as a whole, and air or the like is hardly confined in part.

  The dimension of the root groove 26 whose cross-sectional shape is shown as a substantially V-shape is 3 to 5 mm in width under the above molding conditions in which the injected polyurethane raw material reaches the vicinity of the corner 23 without increasing its viscosity, What is necessary is just to select a depth suitably in the range of 5-15 mm. When the width is narrower than this range or when the depth is shallow, it is difficult to obtain the effect of increasing the flow rate of the polyurethane raw material, and when the width is widened or the depth is increased, the cushion is more effective than the effect of increasing the speed. The problem that a protrusion appears on the pad 11 is a problem. This is because even if the protrusion is removed by post-processing, it is difficult to reuse the discarded portion, resulting in wasted material. Furthermore, if the root groove 26 is too deep, this leads to a waste of frequent and careful cleaning of the mold.

  7 (a) to 7 (d), unlike the case of FIG. 6, foaming starts early in the middle of the flow of the polyurethane raw material injected into one point of the central bottom 33 toward the corner 23, and the viscosity of the raw material is reduced. It is a figure which shows the condition in the molding conditions which increase. The protruding end of the front line 42 of the polyurethane raw material that is injected and spreads is at a position higher than the central bottom surface 33 of the lower mold 30. When the polyurethane raw material flows and spreads, the foaming pressure boosts the flow. However, braking is applied at the portion in contact with the central bottom surface 33, and as a result, the protruding end of the front line 42 appears at a height that is overhanging in the flow direction. The overhang state appears more prominently as the foaming reaction of the polyurethane raw material proceeds.

  FIG. 7 (d) shows the vicinity of the tip of the polyurethane raw material flowing through the central bottom surface 33, and the phantom line shown by the two-dot chain line is when the polyurethane raw material covering the entire central bottom surface 33 is uniformly expanded upward by the foaming reaction. The outline is shown.

  FIG.7 (c) shows the front-end | tip part of the polyurethane raw material which approached the base vicinity of the front-back direction protrusion part 21a. As the tip moves to the left in the figure, the arrow shows how the air in the space 43 escapes upward and into the root groove 26.

  FIG. 7B shows a state in which the polyurethane raw material front end portion shown in FIG. 7C reaches the front-rear ridge portion 21a and the height of the front end portion increases as foaming proceeds. Here, the state where the foam does not enter the root groove 26 is shown, but depending on the molding conditions, the foam may partially enter the root groove 26 due to the action of foaming pressure. However, the polyurethane raw material in the middle of foaming does not completely block the root groove 26. In the present embodiment, as shown in FIG. 1, the root groove 26 is extended to form a groove on the inclined surface 35, and is connected to the parting surface 30 a, so that the air driven into the root groove 26 and the like Is discharged to the parting surface 30a through the root groove 26.

  In FIG. 7, the cross-sectional shape of the root groove 26 is substantially V-shaped, but the dimension is such that the foaming reaction of the injected polyurethane raw material starts and reaches the corner 23 while increasing its viscosity. The width may be appropriately selected within a range of 2 to 3 mm and a depth of 1 to 5 mm. If the width is narrower than 2 mm, a release agent may remain in the root groove 26, and it is difficult to remove it even by cleaning the mold, and this is not preferable because it blocks the passage through which air or the like moves. In addition, when the width is wider than 3 mm, the foam easily enters the groove due to the foaming pressure, which is not preferable because the passage of air or the like is blocked. Further, when the depth is shallower than 1 mm, it does not become a groove as a passage through which air or the like moves, and there is no problem as a passage through which air or the like moves even when the depth is deeper than 5 mm. The mold release agent and the like accumulated by molding may adhere to the molded foam as a lump, which is not preferable.

  In some cases, a separate polyurethane foam sheet 16 or the like is attached to the seat cushion 10 at a predetermined position on the seating surface (upper surface) in order to impart air permeability or the like. In such a case, the cross-sectional shape and dimensions of the root groove 26 are accurately set so that the protrusion 17 formed by the root groove 26 is positioned for adhering the polyurethane foam sheet 16 as shown in FIG. What can be positioned may be adopted.

According to the polyurethane foam mold of the above embodiment, the following effects can be obtained.
(1) In the above embodiment, it is provided with the base portion groove 26 along the longitudinal direction ridges 21a and the vehicle width direction ridges 21b to the base of the longitudinal ridges 21a and the vehicle width direction ridges 21b When the polyurethane raw material before foaming injected into the central bottom surface 33 of the mold flows and spreads through the central bottom surface 33, it flows faster in the root groove 26 than the position of the other central bottom surface 33. Therefore, the polyurethane raw material has increased the overall flow speed, and can reach the corner 23 before the foaming reaction proceeds through the cream time. Therefore, after the polyurethane raw material covers the entire surface of the central bottom surface 33, the expansion due to foaming progresses almost uniformly, so that air or the like is not confined in the corner 23, and formation of a lacking portion in the foam can be prevented.

  (2) In the above embodiment, the root groove 26 is provided at the base of the front-rear direction protrusion 21a and the vehicle width direction protrusion 21b. The polyurethane raw material that has been injected into the central bottom surface 33 and has started to increase in viscosity after cream time flows into the central bottom surface 33 and becomes in a state of holding air or the like in its front portion. However, the air around the front portion that reaches the roots of the front and rear ridges 21a and the vehicle width direction ridges 21b is discharged from the parting surface 30a through the root groove 26 without being trapped. Therefore, unlike the prior art, the air at the base of the protrusion does not collect at the corner 23. Therefore, the formation of a lacking part in the foam can be prevented.

  (3) In the above embodiment, since the root groove 26 is extended to form the groove on the inclined surface 35, even when the inclined surface 35 is formed at an angle close to a right angle with respect to the central bottom surface 33. The air in the root groove 26 can escape to the parting surface 30a through the extended groove. Therefore, the formation of a lacking part in the foam can be prevented.

  (4) In the above embodiment, the protrusion 17 on the surface of the cushion pad 11 formed by the root groove 26 can be used for positioning when the polyurethane foam sheet 16 is adhered. Therefore, since the polyurethane foam sheet 16 and the like can be easily positioned at a predetermined position, the quality as the seat cushion 10 can be kept constant.

(Second Embodiment)
Next, a second embodiment in which the present invention is embodied in a foam molding die for molding a cushion pad of a seat seat of an automobile will be described with reference to FIG. In the second embodiment, the root groove 26 is formed at the intersection 24 where the inner side surface 22a of the front and rear ridge portion 21a intersects the inner side surface 22b of the vehicle width direction ridge portion 21b of the first embodiment. It is the structure which added the crossing part groove | channel 27 which continues to and reaches the upper end of the crossing part 24. Therefore, detailed description of the same parts as those in the first embodiment is omitted.

Therefore, according to the second embodiment, in addition to the effects described in the first embodiment, the following effects can be obtained.
(1) In the second embodiment, even if air or the like is enclosed in the corner 23, the air or the like travels upward through the intersection groove 27 before being enclosed in the corner 23. It is possible to escape. Therefore, air cannot be retained, and it is possible to more reliably prevent the formation of a lacking portion in the foam.

(Third embodiment)
Next, a third embodiment in which the present invention is embodied in a foam mold for molding a cushion pad of a seat seat of an automobile will be described with reference to FIG. Note that the third embodiment is different from the first or second embodiment only in that the configuration for forming the front-rear direction protrusion 21a and the vehicle width direction protrusion 21b is changed. Detailed descriptions of the same parts as in the embodiment will be omitted.

  As shown in FIG. 9A, a long plate-like protrusion 50 formed separately is fixed to a mounting groove 56 provided in the lower mold 30 with a bolt. As shown in the drawing, the plate-like ridge body 50 integrally includes a ridge upper portion 51 located at the upper portion of the central bottom surface 33 and a ridge lower portion 52 located within the attachment groove 56. The ridge lower portion 52 is thicker at the thickness transition portion 54 and is thicker than the ridge upper portion 51. The thickness transition portion 54 is located near the center bottom surface 33. A root groove 26 is formed between the slope of the upper end opening of the mounting groove 56 and both side surfaces of the thickness transition portion 54.

  In addition, if the fitting portion 53 between the mounting groove 56 and the protrusion lower portion 52 is a gap fitting in which a slight gap is interposed, the gap does not allow the polyurethane raw material to pass, and only air or the like passes therethrough. It becomes a road.

Therefore, according to the third embodiment, the following effects can be obtained in addition to the effects described in the first and second embodiments.
(1) In the said 3rd Embodiment, if the fitting of the fitting part 53 of the attachment groove 56 and the protrusion lower part 52 is made into a clearance fitting, it will be set as the flow path which allows only the air etc. not to pass through a polyurethane raw material. Can do. Since the air etc. which have lost the escape area and stayed in the root groove 26 escapes from the gap of the fitting portion 53, formation of the lacking portion of the cushion pad 11 can be prevented.

In addition, you may change the said embodiment as follows.
Although the cross-sectional shape of the root groove 26 is shown as a substantially V shape in each embodiment, for example, in the third embodiment, the root groove 26 is substantially U-shaped as shown in FIGS. 9B and 9C. Alternatively, it may be substantially rectangular or may have other shapes.
9 (a) shows an embodiment in which the thickness transition portion 54 is provided, but the thickness transition portion 54 is not provided, and a notch portion is provided only at the upper end portion of the mounting groove 56 to provide a root portion. Needless to say, the groove 26 may be used.
In each of the above embodiments, the present invention is embodied in a cushion pad of an automobile seat cushion, but the present invention is applied not only to a seat back but also to a polyurethane foam other than an automobile seat. The effect of the present invention is exhibited as long as it has a groove that partially intersects the foamed foam surface.

The perspective view which shows the lower mold | type of the polyurethane foam molding die which actualized this invention. The fragmentary perspective view which shows 1st Embodiment of this invention. Sectional drawing which shows the raw material injection | pouring state of shaping | molding using the foaming die which actualized this invention. Sectional drawing which shows the state before mold opening of the shaping | molding using the foaming die which actualized this invention. The perspective view which shows the foaming molded product by the foaming die which actualized this invention. The simulation figure which shows the flow etc. of the polyurethane raw material in the foaming die which actualized this invention. (A) is a schematic diagram showing the flow of the polyurethane raw material in the foaming mold embodying the present invention, and (b) to (d) are AA line, BB line, C in FIG. FIG. The fragmentary perspective view which shows 2nd Embodiment of this invention. (A) is a fragmentary sectional view which shows 3rd Embodiment which actualized this invention, (b), (c) is sectional drawing which shows a modification, respectively. Sectional drawing which shows an example of the effect of the foaming molded article by the foaming die of this invention. The perspective view which shows the foaming molded product in a prior art. (A) and (b) are the fragmentary perspective views which show the pattern in which the lacking part was formed in the foam in the prior art.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Seat cushion, 11 ... Cushion pad, 14 ... Lack part, 21 ... Projection part, 21a ... Front-rear direction protrusion part, 21b ... Vehicle width direction protrusion part, 22a ... Side wall, 22b ... Side wall, 23 ... Corner , 24 ... intersection, 25 ... foam, 26 ... root groove, 27 ... intersection groove, 30 ... lower mold, 30a ... parting surface, 33 ... center bottom surface, 34 ... side bottom surface, 35 ... slope, 41 ... tip line, 42 ... tip point, 43 ... space part, 50 ... plate-like protrusion, 51 ... upper part of protrusion, 52 ... lower part of protrusion, 54 ... thickness transition part, 56 ... mounting groove

Claims (6)

For forming a groove-like recess which intersects the surface of the polyurethane foam, the foam molding mold having a protruding portion that intersects the lower mold bottom surface, extends along the ridge at the base of the ridge, A polyurethane foam mold characterized in that a crossing groove is provided at an intersection of the protrusions. The polyurethane foam mold according to claim 1, wherein the groove extends to a parting surface of the lower mold. The polyurethane foam molding die according to claim 1 or 2, wherein the projecting portion is a plate-like projecting body incorporated in a bottom surface of the lower mold of the foam molding die. The said plate-shaped protrusion has a thickness transition part which thickens thickness under the said lower mold | type bottom face, and forms a part of said groove | channel by this thickness transition part. 2. A polyurethane foam mold according to 1. 5. The groove according to claim 1, wherein a groove that extends from the root of the ridge to the upper end of the ridge is provided at the intersection formed by the intersecting ridge. The polyurethane foam mold according to any one of the above. The said groove | channel is formed in the base of the side surface containing the cross | intersection part formed by the said cross | intersection ridge part among the both sides | surfaces of the said ridge part, The inside of Claim 1 thru | or 5 characterized by the above-mentioned. The polyurethane foam mold according to any one of the above.

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