JPH05318602A - Deep groove shaping method in adhesive sheet - Google Patents

Abstract

PURPOSE:To make a decorative groove of an adhesive sheet sharp and deep. CONSTITUTION:When a mold pad 3 is clamped under heat, steam as high as approximately 100 deg.C in temperature is sprayed to a part of a sheet cover which is to be pressed into a groove part 3a of the mold pad 3. In this manner, the same part of the sheet cover is expanded to substantially fit along the groove part 3a. In this state, the sheet cover 2 is bonded to the mold pad 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deep groove forming method for an adhesive sheet for forming a linear decorative groove formed mainly on a seat surface of the adhesive sheet into a sharp deep groove shape.

[0002]

2. Description of the Related Art Conventionally, an adhesive sheet 20 having a linear decorative groove 30 on its seat has been manufactured as follows. First, as shown in FIG. 4, a hot-melt type adhesive 22 is applied to the surface of the mold pad 21 and kept in a dry state. Groove portions 21a, 21b, 21b for decorative grooves are provided along the front-rear direction (direction orthogonal to the drawing) on the bearing surface of the mold pad 21 and on both sides thereof, and the adhesive 22 is on both sides. Is applied to the main seating portion inside the groove portions 21b and 21b. Therefore, the adhesive 22 is also applied inside the groove 21a at the center of the seat surface.

Next, as shown in FIG. 5, the seat cover 23 and the seat frame 24 are assembled to the mold pad 21, and the seat cover 23 is put in a substantially wrapped state. Although illustration is omitted, the seat cover 23 is drawn into the groove portions 21b, 21b on both sides of the mold pad 21 by using a C-shaped ring, so that a line is formed along the boundary between the seat surface and both side holder portions. The decorative grooves 31, 31 in the shape of a circle are formed in advance.

On the other hand, the seating surface (main seating portion) of the mold pad 21 is formed in a slightly concave shape in order to obtain a good seating property, and at this time, the seat cover 23 is formed in the groove 21a at the center of the seating surface. The seat cover 23 is not retracted, so that the seat cover 23 has both the decorative grooves 31, 31.
In between, it is said to be in a state of being lifted from the seat surface and being stretched.

After the seat cover 23 is put into a substantially wrapped state in this manner, the mold pad 21 is set on the pressing die 25 as shown in FIG. Here, the clamping die 2
A pressing protrusion 25a is provided at the center of the upper surface of the mold 5 corresponding to the groove 21a at the center of the seat surface of the mold pad 21, and the mold pad 21 has its seat surface facing downward (the upper and lower surfaces are repeatedly turned upside down). ), The push-in ridge 25a is placed and set on the pressing and lowering die 25 with the groove 21a along the groove 21a.

When the setting of the mold pad 21 is completed, the pressing upper die 26 is pressed to heat and maintain it at a predetermined temperature,
As a result, the adhesive 22 is heated and melted, and the seat cover 23
Is adhered to the mold pad 21, and after sufficient time to obtain a sufficient adhesive effect, it is cooled to dry the adhesive 22,
Thereby, the adhesive sheet 20 is obtained.

Here, the pressing upper die 26 is held by pressing, so that the pushing-in ridge 25 a provided on the pressing lower die 25.
Is pushed into the groove 21a of the mold pad 21, the seat cover 23 is pushed into the groove 21a, and the seat cover 23 is bonded in this state,
Decorative groove 30 in which the seat cover 23 is drawn into the seat surface
It was possible to obtain the adhesive sheet 20 on which was formed.

[0008]

As described above, conventionally, when pressing, the seat cover 23 is pushed into the groove portion 21a of the mold pad 21 by the pushing protrusion 25a, and the seat cover 23 is adhered in this pushed state. Although the decorative groove 30 was shaped, this method had the following problems.

That is, the seat cover 23 is the frame 2
By 4 to be substantially wrapped in the mold pad 21,
The seat cover 23 is in a state of being lifted from the seat surface of the mold pad 21 and being stretched (see FIG. 5). In addition, for example, when the seat cover 23 has been subjected to a raising process, it is necessary to suppress the heating temperature at the time of clamping in order to prevent the hair from collapsing. It was set to about 60 ° C., which is the minimum temperature required to bring 22 into the molten state.

Therefore, the seat cover 2 is pressed at the time of pressing.
Since 3 is pushed into the groove 21a by the pushing protrusion 25a in a stretched state, it is difficult to push the groove 3 into a state sufficiently following the shape of the groove 21a, and the decorative groove 30 of the obtained adhesive sheet is shown in FIG. As shown in (1), the width W is wide and the depth H is shallow, and the bottom shape R is often sagging, resulting in an unattractive appearance.

The present invention has been made in view of this problem.
An object of the present invention is to provide a deep groove shape forming method in an adhesive sheet in which a width W is small, a depth H is large, and a sharp deep groove-shaped ornamental groove of the bottom shape R can be formed.

[0012]

In order to solve the above-mentioned problems of the present invention, the pressing die on the side provided with the push-in ridge is sufficient to heat and melt the adhesive applied to the mold pad. The low temperature steam of temperature can be sprayed on the seat cover other than the portion pressed into the groove portion, and the seat cover of the portion pressed into the groove portion has a temperature higher than that of the low temperature steam and The high temperature steam having a temperature sufficient to release the seat cover from the tensioned state and loosen the seat cover is configured to be capable of being sprayed, and in the pressure tightened state of the seat cover, the high temperature steam is applied to the portion of the seat cover pressed into the groove portion. Is blown onto the mold pad to loosen the seat cover and imitate the groove portion so as to adhere the seat cover to the mold pad. And wherein the door.

[0013]

According to the above method, the pressing die on the side where the push-in ridge is provided releases the seat cover of the portion which is pushed into the groove portion of the mold pad by releasing the tensioned state of the seat cover and releasing it. It is possible to spray high-temperature steam at a temperature that is sufficient to maintain the seat cover in this part in a relaxed state by spraying high-temperature steam on the seat cover pressed into the groove when pressing. By doing so, it is possible to bond the seat cover to the mold pad after making the seat cover of the same part almost imitate the groove portion, and the decorative groove of the adhesive sheet thus obtained has a deep groove sharp shape. It is formed.

[0014]

Embodiments of the present invention will now be described with reference to FIGS. First, of the pressing dies used in the deep groove shape forming method of this embodiment, the pressing dies 4 in which the pressing projections 4a for pressing the seat cover 2 into the groove portions 3a of the mold pad 3 are formed will be described. It should be noted that the pressing upper die 5 which constitutes the pressing die in combination with the pressing lower die 4 does not need to be particularly changed, and therefore its explanation is omitted. Further, in this example, the lower clamping die 4 is a fixed die, and the upper clamping die 5 is a movable die supported so as to be movable up and down.

The pressing lower die 4 forms a pair with the upper pressing die 5 and presses the mold pad 3 with the seat cover 2 in a substantially enclosed state. As shown in FIG. The inside thereof is formed into a cavity and is divided into two chambers, a high temperature chamber 6 and a low temperature chamber 7. Both chambers 6 and 7 are clamp type 4
Is connected to the high-temperature steam device 8 and the low-temperature steam device 9 on the lower surface of
The high temperature steam of ℃ is supplied to the low temperature chamber 7, the low temperature steam of about 60 ℃.

Further, on the upper surface of the pressing die 4, there is provided a pushing protrusion 4a for pushing the seat cover 2 into the groove portion 3a of the mold pad 3, and an adhesive applied to the mold pad 3 A large number of ejection holes 10 to 10 for ejecting steam for heating and melting 11 are formed, and the high temperature chamber 6 passes through the ejection holes 10a to 10a located along the vicinity of the base of the pushing protrusion 4a, and at a low temperature. The chamber 7 is opened above the pressing mold 4 through the other ejection holes 10b to 10b.

Next, the compression clamping die 4 constructed as described above.
The actual manufacturing process of the adhesive sheet 1 will be described step by step using. In addition, an application process of applying the hot-melt type adhesive 11 to the seat surface of the mold pad 3, and the seat cover 2 and the frame are assembled to the mold pad 3 after the application process, and the seat cover 2 is generally wrapped. The encapsulation step in the state may be carried out as usual and does not require any particular change (see FIGS. 4 and 5). Therefore, in the mold pad 3 that has undergone both of the above steps, the seat cover 2 is drawn along the boundary between the main seating portion and both side holder portions to form the decorative grooves 12b, 12b. Between 12b, the seat cover 2 is in a state of being lifted from the seat surface of the mold pad 3 and being stretched.

After the coating step and the packaging step as described above, the mold pad 3 is placed and set on the upper surface of the pressing die 4. At this time, the bearing surface of the mold pad 3 (the side on which the groove portion 3a is formed) is placed with the pressing die 4 facing, and the groove portion 3a is set along the pushing protrusion 4a.

When the mold pad 3 is set in a predetermined state, the upper clamping die 5 is then lowered to clamp the molding pad 3 with the lower clamping die 4. As a result, the seat cover 2 is pressed against the portion of the mold pad 3 to which the adhesive 11 is applied, and the pushing protrusion 4a is inserted into the groove 3a of the mold pad 3 so that the predetermined portion of the seat cover 2 is It is pushed into the groove 3a. In this state, the portion of the seat cover 2 pushed into the groove portion 3a is still in a tensioned state and is not in a state of being pushed into the groove portion 3a by a sufficient width.

When the upper clamping die 5 reaches the lower end and the mold pad 3 is clamped with a sufficient pressing force, the high temperature steam device 8 and the low temperature steam device 9 are next.
To supply high temperature steam of about 100 ° C. to the high temperature chamber 6 and low temperature steam of about 60 ° C. to the low temperature chamber 7,
The mold pad 3 is sprayed through the ejection holes 10a to 10a and 10b to 10b, respectively. As a result, the adhesive 11 applied to the mold pad 3 is heated and becomes in a molten state, and this also impregnates the back surface (the surface on the mold pad 3 side) of the seat cover 2. This pressure-heated state is maintained for the time required to sufficiently impregnate the seat cover 2 with the adhesive 11 and obtain a good adhesion effect.

Then, in this pressing and heating state, in the portion of the seat cover 2 which is pushed into the groove portion 3a of the mold pad 3, the high temperature chamber is passed through the ejection holes 10a to 10a located near the base of the pushing protrusion 4a. The high temperature steam of about 6 to about 100 ° C. is sprayed on the seat cover 2, so that the seat cover 2 in this portion is sufficiently heated to be in a relaxed state, not in the tensioned state, and is pushed into the groove portion 3a with a sufficient width. It is supposed to be Further, the adhesive 11 applied to the periphery of the groove 3a is heated and melted by the high temperature steam, and the seat cover 2 in the portion pressed into the groove 3a is impregnated.

On the other hand, from the low temperature chamber 7, the ejection holes 10b-10
After passing through b, low temperature steam of about 60 ° C. is jetted out, and is sprayed on the portion of the seat cover 2 other than the portion pushed into the groove 3a. The low-temperature steam heats and melts the adhesive 11 applied to the portion other than the periphery of the groove 3a, and the molten adhesive 11 impregnates the seat cover 2 in the portion other than the portion pressed into the groove 3a. It is in a state.

In this way, after the pressed heating state is maintained for a predetermined time, the pressing upper die 5 is lifted to open the die, while the steam devices 8 and 9 are stopped and the heating of the mold pad 3 is completed. As a result, the mold pad 3 is gradually cooled, and by extension, the adhesive 11 is cooled and gradually dried, so that the seat cover 2 is firmly bonded to the mold pad 3. In the adhesive sheet 1 thus obtained, the portion of the sheet cover 2 pressed into the groove 3a of the mold pad 3 is adhered in a state of substantially following the groove 3a, and a sufficient width is pressed into the groove 3a. It is the formed decorative groove 12a.

In this example, the deep groove shape forming method as described above provides the following operational effects. That is,
The inside of the pressing mold 4 is divided into two chambers, a high temperature chamber 6 and a low temperature chamber 7, and from the high temperature chamber 6 passes through the ejection holes 10a to 10a located near the base of the pushing protrusion 4a and a high temperature of about 100 ° C. The steam is sprayed onto the seat cover 2 in the portion pressed into the groove 3a of the mold pad 3. As a result, the portion of the seat cover 2 that is pressed into the groove 3a
Is heated to release the tensioned state and becomes a relaxed state. From this, the seat cover 2 in the same portion is loosened and adhered in a state of substantially following the groove portion 3a, and the decorative groove 12a thus formed is seated with a sufficient width as shown in FIG. 2 is pressed into the groove portion 3a, the width W thereof is small, the depth H thereof is deep, and the bottom shape R is sharp, so that the groove shape is finished.

Here, the temperature of the steam sprayed to heat and melt the adhesive is set so as to prevent the hair from collapsing in the case where the seat cover has been subjected to a raising treatment in the past. Was suppressed to a relatively low temperature (about 60 ° C.) sufficient to melt the. On the other hand, in this example, there are two types of steam ejected from the clamping die 4; high-temperature steam and low-temperature steam, and low-temperature steam is kept at about 60 ° C. as usual, and a raised cover is applied to the seat cover. However, the high temperature steam is set to about 100 ° C. However, as described above, this high-temperature steam has the pushing-in ridge 4a.
The sheet cover 2 in the portion pressed into the groove 3a of the mold pad 3 is sprayed by the mold pad 3, and the seat cover 2 in the portion is pressed by the pressing protrusion 4a as shown in FIG. Without being pressed by
It is in a state of floating from the top surface. Therefore,
If it is in a state of being pressed against the clamping die 4, even if the steam temperature is set to about 100 ° C. at which the hair collapse occurs, hair collapse does not occur at the same portion, The quality of the adhesive sheet 1 is not impaired.

[0026]

According to the present invention, in order to form the decorative groove on the seating surface of the adhesive sheet, the seat cover of the portion pressed into the groove portion of the mold pad is loosened by eliminating the tensioned state of the portion. By the method of adhering the seat cover to the mold pad with the seat cover of the same portion almost following the groove portion, the decorative groove formed on the obtained adhesive sheet was pressed with the seat cover having a sufficient width. The decorative grooves can be formed in a deep groove shape.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a pressing die and a mold pad during pressing heating according to an embodiment of the present invention.

FIG. 2 is a detailed view of a portion A of FIG. 1, which is a vertical cross-sectional view of a state in which a seat cover is pushed into a groove portion by a pushing protrusion.

FIG. 3 is a vertical cross-sectional view of a decorative groove formed by the method of this example.

FIG. 4 is an explanatory diagram of an adhesive applying step.

FIG. 5 is an explanatory diagram of a seat cover wrapping process.

FIG. 6 is a vertical cross-sectional view of a pressing die and a mold pad according to a conventional decorative groove shape forming method.

FIG. 7 is a vertical cross-sectional view of a decorative groove formed by a conventional method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Adhesive sheet 2 ... Sheet cover 3 ... Mold pad 4 ... Clamping type 5 ... Clamping upper type 6 ... High temperature chamber, 7 ... Low temperature chamber 8 ... High temperature steam device, 9 ... Low temperature steam device 10 ... Spout hole 10a ... Blowout holes near the base of the pushing protrusion 10b ... Blowout holes other than near the base of the pushing protrusion 11 ... Adhesive agent 12 ... Decorative groove 20 ... Adhesive sheet having a decorative groove formed by a conventional method 25 ... Pressing down Mold 25a ... Push-in ridge 30 ... Decorative groove in the center of the bearing surface, which is a decorative groove formed by a conventional method

Continuation of front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display area B29L 31:58 4F

Claims (1)

[Claims] 1. A pressure-clamping die is used to bond the seat cover to the mold pad by heating and holding the seat cover in a pressure-tightened state on the mold pad whose seat surface is mainly coated with a hot-melt adhesive. In the adhesive sheet, the decorative groove formed by pressing the seat cover along the groove portion for the decorative groove formed on the seat surface of the mold pad by the pressing protrusion provided on the pressing mold is deep groove shape. In the method for forming the press-fitting ridge, the pressing die on the side where the pushing-in ridge is provided pushes low-temperature steam having a temperature sufficient to heat and melt the adhesive applied to the mold pad into the groove. The seat cover can be sprayed onto the seat cover other than the covered portion, and the seat cover of the portion pressed into the groove portion has a temperature higher than that of the low temperature steam and a seal of the same portion. The high temperature steam of a temperature sufficient to release the seat cover from the tensioned state and loosen the seat cover is configured to be capable of being sprayed, and in the pressure tightened state of the seat cover, the high temperature steam is applied to the seat cover pressed into the groove. A method for forming a deep groove in an adhesive sheet, characterized in that the seat cover is adhered to the mold pad in a state in which the seat cover in the same portion is loosened to follow the groove by spraying.