JPH0725049B2 - Molding method for vinyl chloride sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Use) In the present invention, a vinyl chloride sheet is cut out into a certain shape and, at the same time, a V-shaped groove serving as a folding line is formed by heating at a predetermined position of the vinyl chloride sheet. The present invention relates to a method for forming a vinyl chloride sheet, and relates to a method for forming a vinyl chloride sheet, which prevents warping of the vinyl chloride sheet during molding and enables transportation without being bulky.

(Prior Art) Conventionally, when assembling a box or the like using a thermoplastic sheet such as vinyl chloride, as a method of forming the thermoplastic sheet, after the step of cutting out the thermoplastic sheet into a certain shape, In order to easily bend such a thermoplastic sheet, a method for forming a thermoplastic sheet has been performed in which a folding line portion is formed by applying a high-frequency electric field to the surface of the thermoplastic sheet, and a box or the like is assembled ( For example, Japanese Examined Patent Publication No. 54-30707).

In such a forming method, after the step of cutting out the thermoplastic sheet into a certain shape, the folding line portion is formed in another step, it takes time to form the thermoplastic sheet, and the high frequency electric field is applied. In the method of forming the folded line portion by applying the method, the apparatus is expensive and the forming cost is high.

Therefore, in order to reduce the number of processes and enable mass production,
A method has been adopted in which cutting and folding line formation are performed simultaneously.

The forming method is that a V-shaped groove forming blade that forms a V-shaped groove that becomes a folding line on a sheet and a cutting blade that cuts the sheet into a certain shape are integrally attached to one forming plate (mold). A V-shaped groove forming blade and a cutting blade are heated by a heater and then pressed against a placed sheet to cut the sheet into a certain shape and at the same time form a V-shaped groove to be a folding line on the sheet. Is.

(Problems to be solved by the invention) However, when such a molding method is performed, the thermoplastic sheet, which is weak against heat, is affected by the heat of the V-shaped groove molding blade and the cutting blade,
The surrounding area was curled up so that it was no longer flat. Such warped sheets tend to be bulky, take up space during storage and transportation, and are unstable when stacked and easily collapse.

Therefore, in order to eliminate the above-mentioned drawbacks, the present invention provides
Cut out the vinyl chloride sheet into a certain shape, and at the same time, cut it into a predetermined position on the vinyl chloride sheet to form a fold line V
It was devised as a problem to be able to heat-form the groove and prevent the sheet from warping at this time so that it can be stored and transported without being bulky or collapsing. is there.

(Means for Solving the Problems) In order to achieve the above-described object, the present invention has a V-shaped groove forming blade heated by a heater and a vinyl chloride under the forming plate attached to the rod. Attach the cutting blade that cuts the sheet into a certain shape so that the tip of the cutting blade projects a predetermined amount downward than the V-shaped groove forming blade, and around the lower cutting die on which the vinyl chloride sheet is placed. Is attached to a position outside the cutting line of the cutting blade, which is lowered as the cutting blade moves downward and is then raised, and heated so that the tip of the V-shaped groove forming blade has a constant temperature. After heating with a heater, the molding plate is slid downward, the cutting blade and the V-shaped groove molding blade are brought into contact with the vinyl chloride sheet placed on the lower cutting die to form a folded line on the vinyl chloride sheet. The V-shaped groove is heated and pressure welded to the V-shaped groove forming blade. Simultaneously with the molding, the cutting blade was moved downward while lowering the elevating table to cut the vinyl chloride sheet.

(Operation) According to the present invention, the tip of the V-shaped groove forming blade is heated to a constant temperature by the heating heater by the above-mentioned technical means, and then the tip of the cutting blade is formed more than the V-shaped groove forming blade. Slide the forming plate attached so that the part protrudes downward by a predetermined distance, and bring the cutting blade and the V-shaped groove forming blade into contact with the vinyl chloride sheet placed on the lower cutting die. A V-shaped groove to be a folding line is formed on a vinyl chloride sheet by heating and pressure welding of a V-shaped groove forming blade, and at the same time, a cutting blade is moved downward while lowering an elevating table to cut the vinyl chloride sheet.

At this time, the vinyl chloride sheet tries to bend back by the heat of the V-shaped groove forming blade so that the periphery is lifted up, but the periphery is cut while the elevating table is lowered by the cutting blade, so it is strongly downward. The force of pushing down and canceling out the warping force is offset, and the vinyl chloride sheet after molding is finished in a flat state.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, in order to cut out a vinyl chloride sheet A such as vinyl chloride into a certain shape, a cutting blade 2 is attached at an appropriate position below the molding plate 1. In order to smoothly cut the vinyl chloride sheet A, the cutting blade 2 has a substantially wedge-shaped tip.

In addition, on the lower side of the molding plate 1, V
A groove forming blade 4 is attached. To make the tip of the V-shaped groove forming blade 4 smoothly bite into the vinyl chloride sheet A and heat-form the folded line portion on the surface of the vinyl chloride sheet A, the heating heater 3 attached to the forming plate 1 is, for example, about After heating to a temperature of 150 ° C. so that the tip of the V-shaped groove forming blade 4 reaches a temperature of, for example, about 60 to 70 ° C., the tip of the V-shaped groove forming blade 4 is attached to the vinyl chloride sheet A. Is heated and pressure contacted.

This V-shaped groove forming blade 4 cuts the vinyl chloride sheet A while forming a V-shaped groove serving as a fold line on the surface of the vinyl chloride sheet A by heating and pressing the V-shaped groove forming blade 4, so that a V-shaped groove is formed. The tip of the groove forming blade 4 is attached to the forming plate 1 in a state of being retracted by a predetermined distance from the tip of the cutting blade 2.

For example, as shown in FIG. 2, when the vinyl chloride sheet A is formed with a thickness of about 0.5 mm, when the vinyl chloride sheet A is cut by the cutting blade 2, the vinyl chloride sheet A has a thickness of about 0.4 mm. The cutting blade 2 and the V-shaped groove are formed in the forming plate 1 so that the tip of the V-shaped groove forming blade 4 bites at a depth of mm and the V-shaped groove is formed in the vinyl chloride sheet A leaving a thickness of about 0.1 mm. The blade 4 is attached.

Further, the V-shaped groove forming blade 4 is located at the tip of the V-shaped groove forming blade 4 because it bites into the surface of the vinyl chloride sheet and heat-forms a V-shaped groove as a folded line in a substantially inverted triangular shape. The cutting edge portion is formed, for example, in a triangular shape having an angle of about 30 degrees.

The cutting blade 2 has the V-shaped groove forming blade 4 attached thereto, and the forming plate 1 is attached to the rod 5 so that it can slide up and down.

In addition, a vinyl chloride sheet A is provided below the molding plate 1.
A lower cutting die 6 for mounting the is installed.

When the molding plate 1 is slid downward around the lower cutting die 6 and the vinyl chloride sheet A is cut into a certain shape by the cutting blade 2, after the cutting blade 2 and the vinyl chloride sheet A come into contact with each other. An elevating table 7 is attached that descends with the downward movement of the cutting blade 2 and rises again after cutting the sheet. The lifting table 7 is attached to the lower cutting tool 6 such that the side surface of the lower cutting tool 6 of the lifting table 7 is directly below the tip of the cutting blade 2 mounted on the molding plate 1. When the vinyl chloride sheet A is cut by 2, the periphery of the vinyl chloride sheet A is strongly pressed down so that it can be easily cut.

Vinyl chloride sheet A is heated by the heat of the V-shaped groove forming blade.
Although it tries to warp so that the surroundings will rise upward, by cutting while lowering the lifting table as described above, the warping force is offset and the vinyl chloride sheet after molding is finished in a flat state. Is.

Then, at the same time as being cut out into a certain shape, a vinyl chloride sheet A having a V-shaped groove formed as a folding line on the surface.
Is lifted by a suction device or the like (not shown) attached to the molding plate 1 and conveyed to a predetermined position, and then processed as a material for assembling a box or the like with one touch.

For example, as shown in FIG. 5, when the vinyl chloride sheet A is assembled into a rectangular columnar box, as shown in FIG. 3, the front wall 9 is formed in a rectangular shape, the rectangular shape is formed on one side. The vinyl chloride sheet A is cut so that the back wall 10 having the adhesive pieces 8 on the sides and the left and right side walls 11, 12 formed laterally smaller than the regular back walls 9, 10 are formed by one sheet. To do. Also, on the upper part of the rear wall 10,
It has a lid piece 13 that closes the mouth of the box, and lid engaging pieces 15 and 16 that engage with the bent pieces 14 of the lid piece 13 provided on the upper portion of the back wall 10 are provided on the upper portions of the left and right side walls 11 and 12. The vinyl chloride sheet A is cut so as to be provided respectively. Furthermore, the front wall 9 and the back wall 10
In the lower part of, the notch 17,18 of substantially trapezoidal shape is provided, and the notch 17,
Bottom pieces 21 and 22 having small cuts 19 and 20 that can be locked to each other are provided in a part of 18, and the bottom pieces are attached to the lower portions of the left and right side walls 11 and 12.
The vinyl chloride sheet A is cut by the cutting blade 2 so as to have the adhesive pieces 23, 24 for adhering 21,22.

Then, as shown in FIG. 3, the front and rear walls 9 and 10 and the left and right side walls.
The heated V-shaped groove forming blade 4 is pressure-contacted in the vertical direction in which 11, 12 and the vertical direction in which the back wall 10 and the adhesive piece 8 are in contact, and V
The character groove B is formed. Further, the back wall 10 and the lid piece 13 are in contact with each other in the lateral direction, the lid piece 13 and the bending piece 14 are in contact with each other in the lateral direction, and the left and right side walls.
11, 12 and the lid engaging pieces 15 and 16 are in contact with each other in the lateral direction, the regular back walls 9 and 10 and the bottom pieces 21 and 22 are in contact with each other in the lateral direction, the left and right side walls 11 and 12 and the adhesive pieces 23 and
The heated V-shaped groove forming blade 4 is also pressure-welded in the lateral direction in which the 4 contacts, and the V-shaped groove C is formed. Further, as shown in FIG. 3, a V-shaped groove provided in a portion where the front wall 9 and the side wall 12 and the rear wall 10 and the side wall 11 are in contact with each other from one end of the substantially trapezoidal cutouts 17 and 18 of the bottom pieces 21 and 22. A V-shaped groove D is formed toward the lower end of B, and adhesive portions 25 and 26 are provided on the bottom pieces 21 and 22.

As described above, the vinyl chloride sheet A that has been cut and formed with the V-shaped grooves B, C, D has the adhesive piece 8 of the rear wall 10 and the side wall.
Adhesive 12 and adhesive piece 25 of the bottom piece 21 and the adhesive piece of the side wall 12
As shown in FIG. 4, by bonding 24 to each other, further bonding the bonding portion 26 of the bottom piece 22 and the bonding piece 23 of the side wall 11 and folding the V-shaped groove D formed in the bottom pieces 21 and 22 into the valley. The vinyl chloride sheet A can be folded as shown. Then, when the folded vinyl chloride sheet A is raised, as shown in FIG. 5, the notches 17 and 18 and the cuts 19 and 2 of the bottom pieces 21 and 22 are shown.
Since the 0s are locked to each other and can be assembled as a box with one touch, the vinyl chloride sheet A can be transported in a folded state without being bulky.

In addition, a vinyl chloride sheet is obtained by attaching a hot-melt type adhesive to each adhesive piece 8,23,24 and the adhesive portion 25,26 of the vinyl chloride sheet A that has been cut and formed with V-shaped grooves B, C, D. The bonded part of A can be finished beautifully while being transparent, and the aesthetic appeal of the assembled box can be improved.

(Effect of the Invention) According to the present invention, the V-shaped groove forming blade 4 heated by the heater 3 is provided below the forming plate 1 attached to the rod 5.
And a cutting blade 2 for cutting the vinyl chloride sheet A into a certain shape so that the tip of the cutting blade 2 projects downward by a predetermined distance from the V-shaped groove forming blade 4. The cutting blade 2 is placed around the cutting lower die 6 on which the
At an outer position from the cutting line of No. 3, an elevating table 7 that descends with the downward movement of the cutting blade 2 and then ascends is attached, and the heater 3 is heated so that the tip of the V-shaped groove forming blade 4 has a constant temperature. After heating by the above method, the molding plate 1 is slid downward, and the cutting blade 2 and the V-shaped groove molding blade 4 are brought into contact with the vinyl chloride sheet A placed on the lower cutting die 6 to make the vinyl chloride sheet A. The V-shaped grooves B, C, and D, which are folding lines, are formed by heating and pressing the V-shaped groove forming blade 4, and at the same time, the elevating table 7 is lowered and the cutting blade 2 is moved downward to cut the vinyl chloride sheet A. As a result, the vinyl chloride sheet A can be cut and the highly flexible V-shaped grooves B, C, D can be formed in an extremely short time.

At this time, the vinyl chloride sheet A tries to bend back by the heat of the V-shaped groove forming blade 4 so that the periphery thereof is lifted up, but the periphery thereof is cut by the cutting blade 2 while lowering the elevating table 7. Then, the vinyl chloride sheet A after being pressed is strongly pushed down and the warping force is offset, and the vinyl chloride sheet A after molding is finished in a flat state.

Therefore, the molded vinyl chloride sheet A is not bulky, and it is possible to stack or bundle a large number thereof, so that it is possible to easily store and transport without worrying about load collapse.

After the molding, the vinyl chloride sheet A after molding is as if two sheets of vinyl chloride sheet A were stacked even after the adhesive pieces 8,23,24 and the adhesive parts 25,26 of the cut sheets were adhered. Since it can be folded extremely flatly, a large amount of the vinyl chloride sheet A before assembly can be transported without being bulky.

As described above, according to the present invention, not only the outer shape can be cut and the V-shaped groove as the bending line can be formed at the same time to manufacture the vinyl chloride sheet at low cost, but also the vinyl chloride sheet is not warped during the forming. It is possible to prevent the occurrence of the occurrence, and to exert various beneficial effects such as not becoming bulky during transportation and the like.

[Brief description of drawings]

1 shows an embodiment of the present invention, FIG. 1 is a sectional view of a vinyl chloride sheet mounted on a mounting allowance, FIG. 2 is an enlarged sectional view of a vinyl chloride sheet cut, Three
Fig. 4 is a development view of a vinyl chloride sheet cut and V-shaped groove is formed. Fig. 4 is a perspective view of the vinyl chloride sheet with the adhesive pieces and adhesive parts bonded together and the sheet folded.
The figure is a perspective view of a state in which the sheets are assembled into a box. DESCRIPTION OF SYMBOLS 1 ... Forming plate, 2 ... Cutting blade, 3 ... Heater, 4 ... V-shaped groove forming blade, 5 ... Rod, 6 ... Lower cutting die, 7 ... Lifting platform, 8
... Adhesive piece, 9 ... Front wall, 10 ... Rear wall, 11 ... Side wall, 12 ... Side wall, 13 ... Lid piece, 14 ... Bend piece, 15 ... Lid engaging piece, 16 ... Lid engaging piece, 17 ... Notch, 18 ... Notch, 19 ... Break, 20 ... Break, 21 ... Bottom piece, 22 ... Bottom piece, 23 ... Adhesive piece, 24 ... Adhesive piece, 25
… Adhesive part, 26… Adhesive part, A… Vinyl chloride sheet, B…
V-shaped groove, C ... V-shaped groove, D ... V-shaped groove.

Claims (1)

[Claims] 1. A V-groove forming blade which is heated by a heater and a cutting blade which cuts a vinyl chloride sheet into a predetermined shape are provided below the forming plate attached to the rod. Also, attach the tip of the cutting blade so that it projects a predetermined amount downward, and on the other hand, around the lower cutting die on which the vinyl chloride sheet is placed, place it outside the cutting line of the cutting blade, and below the cutting blade. Attached with an elevating table that descends with the movement of, and is heated by a heater so that the tip of the V-shaped groove forming blade has a constant temperature, and then slides the forming plate downward to form a cutting blade. The V-shaped groove forming blade is brought into contact with the vinyl chloride sheet placed on the cutting lower die to form a V-shaped groove as a folding line on the vinyl chloride sheet by heating and pressure welding of the V-shaped groove forming blade, and at the same time, the lifting platform. Move the cutting blade downward while lowering Molding process of vinyl chloride sheet which is characterized in that the cutting of the PVC sheet.