JP2018192744A - Manufacturing method of back pad with headrest - Google Patents

Abstract

To provide a manufacturing method of a back pad with a headrest, maintaining quality, having high yield, and further being excellent in workability enhancement and productivity enhancement.SOLUTION: Provided is a manufacturing method of a back pad with a headrest that injects a foam material after attaching a backing material 40 onto a foam molding mold 6, and at the same time closes the mold to foam-mold a pad body integrated with the backing material 40. In the method, an upper portion 4a is formed in a bag shape by sewing cut pieces together. In a lower part 4b, one side 43S, lying from a point on a lower edge of the lower part 4b towards the bag bottom of the upper portion 4a, and the other side 45S, to be a cylindrical portion on the bag mouth side by sewing together with the one side 43S, are left separated without sewing, and the other side 45S is extended to form a horizontally long belt portion 46, which can be laid along the outer circumference on the lower portion of the backing material. After the backing material 40 of the bag-shaped body provided with the horizontally long belt portion 46 is wrapped to cover a headrest inner surface shaping portion 92, the horizontally long belt portion 46 is wound, in the circumferential direction, around the lower half region pertaining to the headrest inner surface shaping portion 92, to be attached.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a method for manufacturing a back pad with a headrest that constitutes a vehicle seat.

  There is a back pad with a headrest of a so-called high-back specification, which is a seat seat mounted on a vehicle such as an automobile and the backrest pad for backrest has a headrest portion integrally formed with the backpad portion. This back pad with headrest is equipped with a bag-shaped backing material on the headrest inner surface forming mold part of the foaming mold, then injecting foam material and closing the mold, and then the backing material is integrated with the headrest part. It is possible to foam the molded pad body. A hole in the downward direction is formed in the headrest part, and a bag-like backing material integrated with the inner wall surface is interposed between the headrest part and the vehicle body side frame (not shown), It prevents abnormal noise from cracking the frame and cracks in the headrest. And the seam allowance that can be made when the backing material is sewn into a bag shape narrowed the flow path by foam molding of the pad body, and it was easy to create voids, but inventions such as Patent Document 1 that solve this problem have been proposed Yes. In Patent Document 1, the backing material is referred to as a back surface material.

JP 2012-34894 A

  However, the conventional products including Patent Document 1 are bag-shaped backing materials (FIGS. 1 to 5 of Patent Document) that spread from the bottom of the bag to the bag mouth, and the headrest inner surface forming mold portion of the foam molding die. 92 is also easy to mount the backing material Y as shown in FIG. 13 (a) of the present application, but it is difficult to mount the headrest inner surface forming die portion 92 as shown in FIG. 13 (b). The recent headrest portion 3 has a case shown in FIG. 1 in which the hole 3u is wider than the lower surface side hole 37. In such a headrest portion 3, the headrest inner surface forming die portion 92 is gradually increased in thickness toward the back pad back surface forming die portion 91 as shown in FIG. For this reason, it is extremely difficult to cover the headrest inner surface forming mold portion 92 with the bag-like backing material Z. Even if the bag-like backing material Z is forcibly covered with the headrest inner surface forming mold portion 92, the skirt portion Z1 of the backing material Z beyond the maximum protruding portion 95 spreads, and sagging occurs, causing trouble. Come on. The slack hem portion Z1 is likely to block the flow path of the pad main body during foam molding or to obstruct the liquid flow of the foam raw material, resulting in poor quality. Further, there is a problem that the slack portion Z1 of the backing material Z is exposed to the product design surface side.

  The present invention solves the above problem, and even if the inside of the hole is wider than the hole opening of the headrest part, the foam main body can be foam-molded while maintaining the high yield and maintaining the high yield, further improving workability and productivity. It aims at providing the manufacturing method of the back pad with a headrest which contributes also to improvement.

  In order to achieve the above object, the gist of the invention described in claim 1 is that after a backing material is attached to the headrest inner surface forming mold part of the foaming mold, the foaming raw material is injected and the mold is closed, and then the headrest part is placed. In the method of manufacturing a back pad with a headrest in which a pad body in which a backing material is integrated with the inner wall surface of the downward hole is foam-formed, the upper portion is formed into a bag shape by stitching a cut piece obtained by cutting the cloth material for the inner wall surface. The lower part separates one side from the lower edge to the upper bag bottom and the other side that becomes the bag mouth side cylindrical part by stitching with the lower side without stitching, and the other side. After covering the headrest inner surface forming mold part with a backing material of a bag-like body provided with a laterally long belt part that extends along the outer periphery of the lower side, the lower half of the headrest inner surface forming mold part The oblong band in the circumferential direction of the area The wound in the headrest with the back pad manufacturing method, characterized by mounting. According to a second aspect of the present invention, there is provided a method for manufacturing a back pad with a headrest according to the first aspect, wherein a seam allowance portion accompanying the stitching of the upper portion in a bag shape is arranged inside the bag, and the backing material is formed on the headrest inner surface forming type. It is characterized by covering the part. The manufacturing method of the back pad with a headrest according to the invention of claim 3 is the method according to claim 1 or 2, wherein the tape piece containing the magnetic material is attached to the tip side portion of the horizontally long belt portion, while the horizontally long belt portion is wound. In the lower half area, a magnet body is embedded on the opposing surface of the tape piece containing the magnetic material, the horizontally long band portion is wrapped around the lower half area, and the magnetic material-containing tape piece is magnetically wound around the magnet body. It is characterized by being attached by suction. According to a fourth aspect of the present invention, there is provided a method for manufacturing a back pad with a headrest according to the first to third aspects, wherein the lower portion of the backing material is provided under the lower portion in addition to the free portion between the one side and the other side. A slit is provided from the edge toward the upper bag bottom.

  The method for manufacturing a back pad with a headrest for a vehicle according to the present invention allows a bag-like backing material to be integrated on the inner wall surface without sagging, even if the inside of the hole is wider than the hole of the headrest portion, and the pad body is foamed. In molding, the slack part eliminates defects such as obstructing the liquid flow of the foaming raw material and appearing on the product design side, and in addition, it is possible to remove the mold, so the quality is stable, yield is improved, productivity is improved, and further work is performed. Exhibits excellent effects such as improved properties.

FIG. 2 is an overall perspective view of a back pad with a headrest, and (B) is a cross-sectional view taken along the line II of FIG. It is an expansion | deployment top view of the cutting piece for backing materials. FIG. 3 is a perspective view of a backing material obtained by sewing the cut pieces of FIG. 2 into a bag shape. FIG. 4 is an explanatory perspective view in which the backing material of FIG. (A) is a side view around a core-type headrest inner surface forming mold part, and (b) is a side view of the headrest inner surface forming mold part of (a) covered with a backing material. (B) is a perspective view of the headrest inner surface forming mold part covered with the backing material and starting to wind the horizontal belt part, (b) is a cross-sectional view of the completion of the mounting of the backing material after winding the horizontal belt part is there. It is a partial perspective view of a core type. FIG. 7 is a perspective view illustrating a state immediately after FIG. It is explanatory sectional drawing which inject | pours a foaming raw material into a lower mold | type. FIG. 10 is a cross-sectional view of the mold closed after FIG. 9. It is sectional drawing which carried out the foam molding of the pad main body after FIG. It is a perspective view of the backing material of the other aspect replaced with the backing material of FIG. It is a description perspective view of a prior art.

Hereafter, the manufacturing method of the back pad with a headrest which concerns on this invention is explained in full detail.
FIGS. 1-12 is one form of the manufacturing method of the back pad with a headrest of this invention, and is applied to the back pad with a headrest of a vehicle rear seat. 1 (a) is a perspective view of a back pad with a headrest, (b) is a cross-sectional view taken along line II of (a), FIG. 2 is a developed plan view of a cutting piece for backing material, and FIG. FIG. 4 is an explanatory view of setting the backing material of FIG. 3 in a core mold, and FIG. 5A is a core-type headrest inner surface forming mold portion. In the surrounding side view, (B) is a side view in which the headrest inner surface forming mold part of (A) is covered with a backing material, and FIG. 6 is an explanation of winding the headrest inner surface forming mold part of FIG. FIG. 7, FIG. 7 is a partial perspective view of the core mold, FIG. 8 is a perspective view showing the state immediately after FIG. 6 (a), FIG. 9 is an explanatory sectional view for injecting foaming raw material into the lower mold, and FIG. FIG. 11 is a cross-sectional view of the pad main body formed by foam molding, and FIG. 12 is a perspective view of a backing material according to another embodiment. In each drawing, the essential parts of the invention are highlighted for easy understanding of the drawings, and parts not directly related to the present invention are simplified or omitted.

  The manufacturing method of the back pad with the headrest is a manufacturing method of the back pad with the headrest of the high back specification in which the headrest portion 3 is integrated with the back pad portion 2 for the vehicle. After the backing material 4 is mounted on the headrest inner surface forming die portion 92 of the foaming mold 6, the foaming raw material g is injected and the die is closed, and then the backing material 4 is placed on the inner wall surface 3 b of the downward hole associated with the headrest portion 3. The integrated pad body 1 is foam-molded. In the foam molding of the pad main body 1, a hole for a downward hole 37 for frame insertion is provided in the headrest portion 3, and the backing material 4 is integrated with the inner wall surface 3 b of the hole.

  This embodiment is applied to the back pad P with a headrest on the left side in the traveling direction in the vehicle rear seat as shown in FIG. In the back pad P with a headrest in FIG. 1 (b), the right side of the paper is the front of the vehicle, and the upper side of the paper is upward. The same applies to “front” and “upward” in the present invention. Prior to foam molding of the pad body 1 of the back pad P with headrest, a backing material 4 and a foam molding die 6 are prepared.

  The backing material 4 is formed in a bag shape at the upper portion 4a by stitching a cut piece 5 obtained by cutting the cloth material for the inner wall surface 3b of the headrest portion 3, and the lower portion 4b is formed at a bottom edge of the upper portion 4a from one point of the lower edge. This is a product in which the one side 43S side toward the other side and the other side 45S side that becomes the bag mouth side cylindrical portion by sewing together are released without sewing (FIG. 3). In the present embodiment, when stitched, a tube is formed on the bag mouth side by stitching the one side 43S side of the cut piece 5 from one point of the lower peripheral edge 48 forming the bag mouth to the bag bottom 420 of the upper portion 4a and the one side 43S side. The other side 45 </ b> S side that is shaped is left without being sewn together. And the other side 45S side extends as it is, and it is a bag-like body which has the horizontally long belt part 46 which can follow the outer periphery of the lower part 4b. 1 and 4 represents a bag mouth when one side and the other side are stitched together.

  Here, the cloth material made of non-woven fabric (or felt or the like) is cut into a single piece 5 as shown in FIG. The front portion 51 for the bag-like backing material 4 is connected to the bottom portion 52 and the rear portion 53 in a vertically long manner, and side portions 54 and 55 extend on both sides of the front portion 51. A horizontally long belt portion 56 extends from the lower half of the left side portion 55 on the left side of the drawing to the left side of the drawing, and a tape piece MT containing magnetic material is attached to the tip portion 561 thereof. In the figure, the lateral length of the laterally long belt portion 46 extending in the lateral direction of the drawing is substantially equal to the sum of the lateral lengths of the rear portion 53, the side portion 54, and the front portion 51 necessary for winding. The magnetic material-containing tape piece MT (hereinafter also simply referred to as “tape piece”) is a tape piece formed of a synthetic resin or rubber containing a ferromagnetic powder such as iron or nickel. Reference numerals 52j to 55j are seam allowance portions. These chain lines on the base side are stitch line imaginary lines 5k when the bag-like backing material 4 is used, and the sewing thread T has not yet been sewn at this stage. A chain line representing each boundary line between the front part 51, the bottom part 52, the rear part 53, and the side parts 54 and 55 is an imaginary line that becomes a bent part when forming a bag, and there is no stitching. Reference numeral 55 </ b> S is a boundary line between the horizontally long belt portion 56 and the side portion, and corresponds to the other side 45 </ b> S when the cut piece 5 is stitched into the backing material 4. Reference numeral 510 denotes a hole provided in the front part 51, reference numeral 511 denotes a front protruding part, and reference numeral 531 denotes a rear protruding part.

  Then, the cut piece 5 is bent to the front side of the drawing along the imaginary line of the bent portion shown in FIG. 2 to align the seam allowance portions 52j to 55j, and is sewn along the seam line E to form the upper portion 4a in a bag shape. In FIG. 2, the left side seam portion 55j of the side portion 55 and the left side seam portion 53j of the rear portion 53, the upper side seam portion 55j of the side portion 55, the left side seam portion 52j of the bottom portion 52, and the right side seam portion 54 of FIG. The upper portion 4a is formed into a bag shape by stitching together the seam portion 54j and the right seam allowance portion 53j of the rear portion 53, the upper seam allowance portion 54j of the side portion 54, and the right seam allowance portion 52j of the bottom portion 52. . The lower part 4b does not sew the one side 43S side and the other side 45S side of the cutting piece 5 from one point of the lower peripheral edge 48 that becomes the bag mouth 47 to the bag bottom 420 of the upper part 4a when stitched as described above. Keep away. Further, the backing material 4 of the bag-like body is provided with a laterally long belt portion 46 that extends on the other side 45S side and can be rotated substantially along the outer periphery of the lower portion 4b (FIG. 3). The laterally long belt portion 56 of the cutting piece 5 is in the laterally long belt part 46 of the backing material 4, the hole 510 provided in the cutting piece 5 is in the through hole 410 of the backing material 4, and the tape piece MT of the cutting piece 5 is the laterally long belt part. The tape piece MT is attached to the distal end portion 461 of 46.

As shown in FIG. 4, the foam molding die 6 includes a lower die 7, an upper die 8, and a core die 9, and the core die 9 and the upper die 8 are connected to the lower die 7 so that they can be opened and closed. When the backing material 4 is attached to the headrest inner surface forming mold portion 92 of the core mold 9 as shown in FIG. 10 and the mold is closed, the lower mold cavity surface 7S, the upper mold cavity surface 8S, and the core mold cavity surface 9S are provided with a headrest. A cavity C of the back pad P is formed.
The lower mold cavity surface 7S has a headrest front outer surface forming surface 7a that is dented in a bowl shape to form an outer surface 3a on the vehicle front side of the headrest portion 3, and a vehicle front side and a vehicle width direction side surface excluding the back surface 2b of the back pad portion 2. A back pad surface forming surface 7m for forming the side design surface 2a is provided (FIG. 9). The upper mold cavity surface 8S is provided with a headrest rear outer surface forming surface 8b and a headrest rearward projecting outer surface forming surface 8f (FIG. 10). On the core cavity surface 9S, a back pad back surface forming surface 9m that forms the back surface 2b of the back pad portion 2 by the back pad back surface forming die portion 91 and an inner wall surface 3b of the head rest portion 3 by the headrest inner surface forming die portion 92 are formed. A headrest front inner surface forming surface 9a and a headrest rear inner surface forming surface 9b are provided (FIG. 7).
Reference numerals 68 and 69 denote hinges that connect the lower mold 7 and the upper mold 8, and hinges that connect the lower mold 7 and the core mold 9, and reference numerals 79, 89, and 99 denote matching surfaces. 4 and 9 to 11, the back pad P with the headrest in FIG. 1A in the vehicle installation state is tilted forward, and the back pad portion rear surface 2b is substantially as shown in FIG. The structure is such that the pad body 1 is made integral with the back pad portion 2 and the headrest portion 3 in a horizontal state.

The back pad P with a headrest is manufactured as follows using the foaming mold 6 and the backing material 4, for example.
First, the backing material 4 is set on the headrest inner surface forming mold portion 92 of the core mold 9 under the mold open state of the foam mold 6 (FIG. 4). For the backing material 4, the backing material 4 of FIG. 3 formed by sewing the cut piece 5 is turned over in advance, and the seam allowance portions 42j to 45j are arranged on the bag inner side 40. The headrest inner surface forming mold portion 92 of the core mold 9 that is substantially upright when the mold is opened is covered with the backing material 4 as shown in FIGS. . The upper half part from the top part of the headrest inner surface forming mold part 92 to the maximum projecting part 95 can be covered without difficulty as shown in FIG. The backing material lower portion 4b is not sewn on the one side 43S side and the other side 45S side, and thus is covered without being caught by the headrest inner surface forming mold portion 92, but there is a gap between the lower half region 921 and the backing material lower portion 4b. It hangs down in a certain state. The horizontally long belt portion 46 also hangs down as shown in the figure.

  Next, the horizontally elongated belt portion 46 that hangs down is wound around the circumferential direction of the lower half region 921 of the headrest inner surface forming mold portion 92 and attached. In order to eliminate the gap and avoid wrinkles, for example, in FIG. 6A, for example, the side 43S side of the backing material lower part 4b disposed on the front side of the paper surface relative to the headrest inner surface forming mold portion 92 is moderately directed to the right side of the paper surface. The rear portion 43 and the rear projecting portion 431 of the backing material 4 are brought into close contact with the lower half region 921 of the headrest inner surface forming mold portion 92, and then the lower half portion is covered with the horizontally long belt portion 46. The horizontally long belt portion 46 is wound around the circumferential direction of the region 921, and the backing material 4 is attached to the headrest inner surface forming mold portion 92. When the horizontally long belt portion 46 is attached to the outer peripheral surface of the backing material lower portion 4b by approximately 3/4 turn, the horizontally long belt portion 46 is laminated on the rear portion 43, the side portion 44, and the front portion 41, and these are formed on the inner surface of the headrest. It can be in close contact with the mold part 92 and there is no sag on the skirt part side of the backing material 4.

  Here, in the present embodiment, as described above, the tape piece MT is attached to the tip portion 461 of the horizontally long belt portion 46, while the lower half portion of the headrest inner surface forming mold portion 92 when the horizontally long belt portion 46 is wound. In a region 921, a magnet body 923 is embedded on the opposing surface of the tape piece MT. The horizontally long belt portion 46 is wound around the lower half region 921, and the tape piece MT is attached to the magnet body 923 by magnetic force adsorption. Since the backing material lower portion 4b is closely attached to the headrest inner surface forming die portion 92, and the shape is not lost, the subsequent foaming of the pad main body 1 is improved. Further, when the horizontally long belt portion 46 is wound around the lower half region 921 of the headrest inner surface forming mold portion 92 so as to overlap with the backing material lower portion 4b, the tape piece is inserted through the through hole 410 as shown in FIG. It is more preferable that the MT is in direct contact with the magnet body 923 because the magnetic force is attracted more strongly.

Thereafter, a soft polyurethane foam raw material g (hereinafter also simply referred to as “foaming raw material”) for molding the back pad main body 1 of the back pad portion 2 and the headrest portion 3 is injected into the lower mold cavity surface 7S and the mold is closed. A predetermined amount of foaming raw material g is injected onto the lower mold cavity surface 7S using an injection nozzle NL or the like (FIG. 9).
Subsequently, the core mold 9 and the upper mold 8 are operated to close the mold (FIG. 10). By closing the upper mold 8, the core mold 9 and the lower mold 7, the cavity C of the back pad P with the headrest in which the backing material 4 attached to the headrest inner surface forming mold portion 92 is insert-set is formed. When the mold is closed, the distal end portion 461 of the horizontally long belt portion 46 is arranged on the lower side as shown in the figure, but the tape piece MT adhered thereto strongly attracts magnetic force to the magnet body 923 embedded in the core mold 9. Thus, the state in which the backing material 4 is mounted on the core mold 9 is maintained. In this embodiment, the mold is closed after the foaming raw material g is injected. However, the foaming raw material g can be injected after the mold is closed.

After the mold closing, the main process is foam molding. 10 is maintained for a predetermined time, and the pad body 1 of the back pad portion 2 with the headrest portion 3 in which the backing material 4 is integrated with the inner wall surface 3b of the downward hole according to the headrest portion 3 as shown in FIG. Foam molding.
In the present embodiment, as shown in FIG. 3, the entire length of the other side 45S related to the backing material lower portion 4b is the width of the horizontally elongated belt portion 46, and the horizontally elongated belt portion 46 extends over the entire area of the backing material lower portion 4b. Since the wrapping is eliminated and the backing material 4 is brought into close contact with the headrest inner surface forming mold portion 92, it is more preferable. Thus, the pad main body 1 is foam-molded so as not to cause a problem that a void or a slack portion due to the slack portion is exposed on the product design surface side.

The figure which finished the foam molding of the said pad main body 1, and then demolded, and has the hole of the lower hole opening 37 in the headrest part 3 in the back surface side of the pad main body 1, and the backing material 4 was integrated with the hole inner wall surface 3b. Every desired back pad P with a headrest is obtained.
Incidentally, the present invention can be carried out without any trouble. The headrest portion 3 is wider in the hole 3u than the lower hole 37 as shown in FIG. The headrest inner surface forming mold part 92 is gradually increased in thickness toward the back pad back surface forming mold part 91 as shown in FIG. The thickness width is made smaller. If the backing material 4 is formed into a bag-like shape by sewing the lower portion 4b of the backing material 4 as before, demolding becomes difficult even if it can be mounted on the headrest inner surface forming mold portion 92.

  However, in this embodiment, after covering the backing material 4 on which the one side 43S side and the other side 45S side of the lower part 4b are freed on the headrest inner surface forming mold part 92, the laterally long belt part 46 is wound around the lower half area 921, Further, the tape piece MT is attached to the magnet body 923 by magnetic force adsorption. At the time of foam molding, the backing material lower portion 4b is held in close contact with the headrest inner surface forming mold portion 92 by magnetic force adsorption, while at the time of demolding, the portion of the horizontally long belt portion 46 extends to allow demolding. Even if the headrest portion 3 has the inner hole 3u in which the hole 37 side where the maximum protrusion 95 is located narrows, the soft pad main body 1 having a high cushioning property has a certain degree of deformation flexibility. Furthermore, the one side 43S side and the other side 45S side are free, and the tape piece MT of the horizontally long belt portion 46 can follow the deformation of the pad body 1 unlike the case where it is sewn, while being held by the magnetic body 923 by magnetic attraction. There is flexibility. The tape piece MT slides sideways on the magnet body 923, and the mold can be removed by opening the periphery of the hole 37 to the hole diameter of the maximum protruding portion 95 necessary for mold removal.

In this manner, a desired backrest P with headrest that can be surely removed from the mold is obtained even if the headrest portion 3 is larger in the hole 3u than in the hole 37. When the back pad P with the headrest is covered with an epidermis, it becomes a seat back of the vehicle rear seat.
Reference numeral 21 denotes a backrest main part, reference numeral 22 denotes a side part, reference numeral 29 denotes a hanging groove, reference numeral 30 denotes a hole bottom, and reference numeral 31 denotes a rear collar.

  FIG. 12 shows a backing material 4 in another mode instead of FIG. A backing material 4 in which a slit 49 is separately formed in the backing material lower part 4b from the lower edge of the lower part 4b to the bag bottom 420 of the upper part 4a, in addition to the free portion between the one side 43S side and the other side 45S side. It is. The slit 49 is provided, and the front part 41 and the side part 44 or the side part 44 and the rear part 43 on both sides of the slit can be easily moved independently. Further, the front part 41 is hung down long, and the foaming of the back pad main body 1 is performed, and the front protruding part 411 in which the backing material 4 is hung down not only on the inner wall surface 3 b of the headrest part 3 but also on the back surface 2 b of the back pad part 2. The back pad P with a headrest is integrated with the part. A front projecting portion 411 is interposed between the back pad portion back surface 2b and the vehicle body side frame (not shown) to prevent rubbing noise. The other structure is the same as that of the backing material 4 in FIGS. 3 and 4, and the description thereof is omitted.

  In the manufacturing method of the back pad with headrest configured as described above, the upper portion 4a is formed into a bag shape, and the lower portion 4b is formed by sewing the side 43S side from one point of the lower edge toward the bag bottom 420 of the upper portion 4a. Since the backing material 4 that is released without stitching the other side 45S side that becomes the cylindrical portion on the bag mouth 47 side is employed, the headrest as shown in FIG. Also in the portion 3, the backing material 4 can be finely lined and integrated with the inner wall surface 3b of the headrest portion hole 3u by foam molding of the pad main body 1. In FIG. 5, the thickness of the headrest is increased toward the back pad back surface forming mold portion 91, and the maximum thickness width Wmax is set in the middle, and then the thickness of the headrest is decreased toward the back pad back surface forming mold portion 91. Since the backing material lower portion 4b having the one side 43S side and the other side 45S side separated from each other is formed with respect to the forming mold portion 92, the maximum thickness width Wmax of the pad main body inner surface forming mold portion 92 is increased by the bag-shaped upper portion 4a. Can be covered easily.

Conventionally, even if it covers over the maximum thickness width Wmax as shown in FIG. 13 (b), the skirt portion Z1 of the backing material Z disposed on the headrest inner surface forming mold portion 92 spreads, and the followability is poor. A slack of the backing material 4 was generated during foam molding of the main body 1, and the flow of the foaming raw material g was blocked or the liquid flow was obstructed, which was liable to cause poor quality. There is no problem. The lower portion 4b of the backing material 4 that covers the headrest inner surface forming mold portion 92 exceeding the maximum thickness width Wmax is separated from the one side 43S side and the other side 45S side, and the lower portion 4b is formed on the headrest inner surface by winding the horizontally long belt portion 46. The slack is eliminated by adopting a structure that is brought close to the mold part 92. A horizontally long belt portion 46 is laminated on the lower portion 4b and wound around the lower half region 921 of the headrest inner surface forming die portion 921 so as to be attached to the lower portion of the backing material 4 including the hem portion. 4b adheres closely to the headrest inner surface forming die portion 92 as shown in FIG.
After covering the headrest inner surface forming die portion 92 and then covering the backing material lower portion 4b with the horizontally long belt portion 46, when winding in the circumferential direction of the lower half region 921 of the headrest inner surface forming die portion 92, one side Even the front part 41 and the rear part 43 of the backing material lower part 4b that hangs down from the 43S side and the other side 45S side can be easily joined to the surface of the headrest inner surface forming mold part 92 without sagging. .
Further, by arranging seam allowance portions 42j to 45j accompanying the stitching of the bag-shaped backing material upper portion 4a on the bag inner side 40 and covering the backing material 4 on the headrest inner surface forming mold portion 92 as shown in FIG. Since the seam allowance portions 42j to 45j become resistances and the flow path is not disturbed or narrowed by foam molding of the pad main body 1, void defects can be eliminated.

  Further, a magnetic tape piece MT is attached to the distal end portion 461 of the horizontally long belt portion 46, and at the lower half area 921 of the core 9 when the horizontally long belt portion 46 is wound, When the magnet body 923 is embedded on the opposing surface of the MT, the horizontally long belt portion 46 is wound around the lower half region 921, and the magnetic material-attached tape piece MT is attached to the magnet body 923 by magnetic force adsorption, the horizontally long belt portion 46 is mounted. Is easily and reliably held. The front end portion 461 of the horizontally long belt portion 46 that is positioned downward when the mold is closed and easily hangs down due to gravity is formed by a simple configuration using magnetic attraction, and the backing material lower portion 4b in which the one side 43S side and the other side 45S side are separated from each other. In addition, the foaming of the pad main body 1 can be safely performed while the backing material 4 is loosely mounted and held on the headrest inner surface forming mold portion 92.

  More specifically, even in the headrest portion 3 as shown in FIG. 1 in which the hole opening 37 is narrower than the hole 3u, the tape piece MT follows the soft pad body 1 which is rich in cushioning and has flexibility of deformation. Smooth movement on the surface of the body 923 facilitates demolding. The headrest portion 3 can be removed from the headrest inner surface forming mold portion 92 by increasing the hole 37 to the diameter of the hole formed by the maximum protruding portion 95.

In addition, when a slit 49 from the lower edge of the lower part 4b to the bag bottom 420 of the upper part 4a is provided in the lower part 4b of the backing material 4 in addition to the free part between the one side 43S side and the other side 45S side, The front part 41 and the side part 44 on both sides and the side part 44 and the rear part 43 easily move independently (FIG. 12). After covering the backing material 4 on the headrest inner surface forming die portion 92, the presence of the slit 49 increases the degree of freedom of movement of the backing material lower portion 4b, and the lower portion 4b is slackened and wrinkled on the headrest inner surface forming die portion 92. The laterally long belt portion 46 can be easily wound around and attached to the circumferential direction of the lower half region 921 of the headrest inner surface forming die portion 92 in a state of being in close contact with each other.
Thus, according to the manufacturing method of the back pad with the headrest, not only the headrest portion 3 having the hole 37 narrower than the hole 3u can be foam-molded of the pad body 1 while maintaining the quality and maintaining the high yield. It has excellent workability, such as quality removal, productivity improvement, workability improvement, etc.

  The present invention is not limited to those shown in the above-described embodiment, and various modifications can be made within the scope of the present invention depending on the purpose and application. The shape, size, number, material, and the like of the pad main body 1, the back pad portion 2, the headrest portion 3, the backing material 4, the cut piece 5, the foaming mold 6 and the like can be appropriately selected according to the application. For example, in the embodiment, a single piece is used for the cutting piece 5 for the backing material 4, but the backing material 4 can be configured by a plurality of cutting pieces 5. The backing material 4 of FIG. 12 is also provided with a through hole 410 and a tape piece MT, and similarly to FIG. 6, a magnet body 923 can be provided on the headrest inner surface forming mold portion 92 facing the tape piece MT.

DESCRIPTION OF SYMBOLS 1 Pad main body 3 Headrest part 3b Inner wall surface 4 Backing material 4a Upper part 4b Lower part 42j-45j Seam allowance part 43S One side 45S Other side 46 Horizontal elongate part 49 Slit 5 Cutting piece 6 Foaming mold 92 Headrest inner surface formation mold part 921 Lower half Area 923 Magnet body P Back pad with headrest g Foaming material MT Tape with magnetic body (tape piece)

Claims (4)

After attaching the backing material to the headrest inner surface forming mold part of the foam molding die, inject the foaming raw material and close the mold, and then attach the pad main body with the backing material integrated to the inner wall surface of the downward hole related to the headrest part In the manufacturing method of the back pad with headrest to be foam-molded,
The upper portion is formed into a bag shape by stitching a cut piece of cloth material for the inner wall surface, and the lower portion is formed on one side of the lower edge from one point toward the upper bag bottom, and the bag mouth side cylinder is formed by stitching with the one side. A backing material for a bag-like body provided with a laterally long belt portion that can be separated from the other side that becomes the shape-like portion without being sewn and that extends along the outer periphery of the lower portion. A method of manufacturing a back pad with a headrest, comprising: covering the headrest inner surface forming mold portion, and then winding and mounting the laterally long belt portion in a circumferential direction of a lower half region related to the headrest inner surface forming mold portion. The manufacturing method of the back pad with a headrest according to claim 1, wherein a seam allowance portion accompanying the stitching of the upper portion in a bag shape is arranged on the inner side of the bag, and the backing material is placed on the headrest inner surface forming mold portion. While sticking a tape piece containing a magnetic material to the tip side portion of the horizontally long belt portion, a magnet body is embedded in the opposite surface of the tape piece containing the magnetic material in the lower half region when the horizontally long belt portion is wound The method for manufacturing a back pad with a headrest according to claim 1 or 2, wherein the horizontally long belt portion is wound around the lower half region and the magnetic tape is attached to the magnet body by magnetic force adsorption. The lower part which concerns on the said backing material WHEREIN: The slit which goes to the bag bottom of the said upper part from the lower edge of the said lower part was provided in the said lower part other than the free location of the said one side and the said other side. The manufacturing method of the back pad with a headrest of Claim 1.

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