JPH0215381B2 - - Google Patents

Description

Detailed Description of the Invention A. Purpose of the Invention (Field of Industrial Application) This invention mainly relates to the perforation of a bag using a heat-fusible film or a part of a bag material band for manufacturing a bag. This device relates to a device for notching parts, particularly for stacking two or more heat-fusible sheets together, punching a hole in the sheet and simultaneously welding the area around the hole, or cutting the edge of the sheet into a V-shape. Or, it relates to a device that cuts out a U-shape and welds the sheet at the edge of the cut out portion.

The heat-fusible sheets to be cut and welded by the apparatus of this invention include thermoplastic films such as polyethylene, polyvinyl chloride, polypropylene, and vinylon, as well as nonwoven fabrics made of thermoplastic resin, foam sheets, synthetic Paper or woven fabric, such as bags (see Figures 11 and 12) or bag material strips (see Figures 2, 15, and 16), other tents, ground sheets, sunglasses, etc. Applications include, but are not limited to, removal sheets (see FIG. 13), consumer electronic product covers, and the like. In short, the purpose is to provide fusing perforations or fusing notches in the sheet.

(Prior art) Conventionally, this type of device is equipped with a pedestal whose upper surface is heat-resistant and elastic, and from above the pedestal, a pipe-shaped fusing edge is welded and fused using a heating rod with a partially discontinuous part. A part of the scraps to be punched out is conveyed while being connected to the sheet, and later the scraps are separated by hand or the like.

In addition, when one side edge of a strip sheet is cut and welded in a V-shape, triangular welding waste is sequentially welded to a dummy tape that is sequentially transferred in a direction perpendicular to the direction in which the strip sheet is transported. A method and device for discarding the dummy tape together with the tape or a device for scraping out separated debris is provided in place of the dummy tape.

(Problems to be Solved by the Invention) In the above-mentioned known devices, the former requires manpower to dispose of the waste after fusing and welding, and the latter requires an increase in the size of the device due to the complexity of the waste disposal device. The ordinary cost of waste disposal was also high, and it was not a very good idea from the standpoint of energy conservation.

It is an object of the present invention to ensure that fusing and welding can be carried out reliably and without adding any special equipment to dispose of fusing debris.

B. Structure of the Invention (Means for Solving the Problems) In order to achieve the above-mentioned problems, this specific invention has the heat welding edge of the heat welding member heated above the melting point of the sheet to be welded facing upward. , two or more sheets to be melted and welded are supplied between the receiving member disposed on the upper side, and the sheets are sandwiched between the thermally melted and welded member and the receiving member, and surrounded by the edge. The sheets in the sandwiched region are cut by melting from the sheets in other parts, the melting edges of two or more overlapping sheets to be melted and welded are welded to each other, and the heat-cutting and welding member is In addition to the method of separating from the sheet, the heat welding member is heated to a temperature higher than the melting temperature of the sheet in a discharge passage formed vertically penetrating the area surrounded or sandwiched by the edges of the heat welding member. The heat-fusible sheet melt-cutting and welding method comprises a method of sequentially melting the melting debris by the heat of the member and discharging the melted debris by flowing it down by its own weight out of the discharge passage.

In addition, in order to achieve the above-mentioned object, in this device invention, the thermal welding member made of a good thermal conductor has an upwardly directed thermal cutting edge in a horizontal plane, and the edge has a closed loop, bent or curved shape, In a region surrounded or sandwiched by the edges, a space is formed in the thermally fused welding member and extends vertically through the space, and extends from the space below the edge to the support member below this. A discharge passage is formed through which the molten resin of the welding debris flows down, and a receiving member whose lower surface is made of a heat-resistant, non-fused, elastic material is provided above the thermal welding member. The heat-fusible sheet melt-cutting and welding device is characterized in that the edge portion of the welding member and the lower surface portion of the receiving member are installed so that they can be pressed against each other in the vertical direction and separated from each other.

In order to achieve the above object, another device invention includes an intermittent transfer device that intermittently transfers the sheet to be welded in the horizontal direction, and a heating device in a horizontal plane slightly below the transfer path surface of the sheet transferred by this device. A thermal welding member having an edge for fusing and welding facing upward is provided, and a receiving member whose lower surface is made of a heat-resistant, non-fusion, and elastic material is provided above the transfer path surface, and the receiving member is provided with a lower surface made of a heat-resistant, non-fused, elastic material. Each time the device is stopped, the edge portion of the thermal welding member and the lower surface portion of the receiving member are installed so that they can be relatively pressed against each other from above and below, and the planar shape of the edge is a closed loop or a bent or curved shape. In a region surrounded or sandwiched by the edges, a space is formed in the thermally fused welding member, penetrating in the vertical direction, and from the space below the edge to the support below. A heat-fusible sheet melt-cutting and welding apparatus is characterized in that a discharge passage through which melted resin of melt-cutting debris flows down is formed over the members.

(Function) The method of the specific invention described in claim 1 will be explained together with the function of the device invention, which is a related invention.

In order to carry out the operation of the device invention and the method of the specific invention as set forth in claim 2, first, the thermal welding member of this device is heated to a temperature higher than the melting temperature of the sheet to be welded.

Two or more sheets to be welded to be welded are fed horizontally between the heat welding member and the receiving member, and each time the sheets are fed, the edges provided on the lower side of the sheets are welded by heat welding with the edges facing upward. When the sheet to be melted and welded is sandwiched from above and below by the member and the receiving member provided above the sheet, the sheet is melted into the shape of the edge by the pressing force and the heat of the heat cutter and welding member. , the portion surrounded by the edge becomes welding debris separated from the sheet and enters the discharge passage in the space at the center of the heat welding member.

The fusing debris separated in the discharge passage gradually melts due to contact with the thermal welding member and radiant heat from the welding member, its planar shape becomes smaller, and it sequentially fuses with the separated fusing debris and flows down the discharge passage under its own weight. and is discharged.

In addition, the fusing edge of the sheet that is in contact with or close to the outside of the edge is melted, and if two or more of the sheets are overlapped, a non-fusing agent (including printing ink) is applied to the mating surfaces. Unless otherwise specified, the upper and lower sheets will be fused together.

As a result, the heat cut and weld member and the pedestal are separated and both are separated from the sheet. After that, the sheet subjected to the welding process is removed.

Next, supply new sheets to be welded one by one,
Repeat the same action.

Next, the operation and specific method invention of the third device invention described in claim 11 are as follows.

Passing the sheet to be melted and welded through a transport path for the sheet between the thermally cut and welded member and the receiving member,
When the sheet is set in an intermittent transfer device, the heat-cutting and welding member is heated to a predetermined temperature in the same manner as in the above-described device, and the entire device is operated, the sheet is transferred to the conveyance path in predetermined size increments.

During each transfer, both the edge of the heat-cutting and welding member and the receiving member are separated from the sheet, and do not have any thermal influence on the sheet being transferred.

Next, each time the intermittent transfer device stops, the thermal welding member and the receiving member approach each other relatively, thereby pressing the sheet against the thermal welding member.

As a result, the sheet is thermally welded into the shape of the edge of the heat-cutting and welding member, and the inner part of the edge is separated from the sheet and becomes welding waste, which falls into the discharge passage of the heat-cutting and welding member. In this case, the welding debris is further heated and melted by contact with the inside of the heat-cutting welding member and by radiant heat, and its planar shape becomes smaller and sequentially melts, and flows down the discharge passage under its own weight and is discharged.

When there are two or more sheets, the outside of the edge is melted, and the fused edges of the upper and lower sheets are welded together. The receiving member then returns upward.

(Example) This invention will now be described with reference to a representative example shown in the drawings.

Example 1 First, the device invention set forth in claim 2 for carrying out the method invention, which is the first specified invention, and the invention set forth in claims 3 and 4, which are embodiments thereof. An embodiment including the following will be described with reference to FIG.

Fig. 3 shows the principle of this device invention, in which a thermal welding member A made of a good thermal conductor, represented by a hollow vertical pipe, is provided on the lower side, and a thermally welding sheet S to be thermally welded is supplied onto this member. Then, by pressing the receiving member B from above, the sheet S is melted by the edge of the heat-cutting and welding member A, and the melted edges are thermally welded, and the receiving member B is provided so as to return upward. It is.

The outer peripheral part 11 of the upper end of the thermal welding member A serves as an edge 10 for fusing and is formed in a closed loop in a horizontal plane, and the central part forms a vertically penetrating space 12, and as a whole, it forms a vertical pipe. The lower part of the space 12 is larger than the diameter of the edge 10.

The lower part of this heat-cutting welding member A is a block (a type or part of a support member) 1 that has a built-in heating source 13.
It is equipped so that it can be freely fitted into the receiving recess 16 at the upper end of the relief hole 15 of No. 4. This block 14 further includes the support member 1
7, the block 14 and the support member 1
7 is provided with a relief hole 15 , and a discharge passage for welding debris 27 from the space 12 is formed by the relief hole 15 .

As shown in FIG. 2, the above-mentioned support member 17 is usually provided on a left-right position adjustment device 30 so that its position can be finely adjusted in the front, rear, left and right directions with respect to the aircraft body.

The surface of the block 14 is covered with a heat insulating material 18 to prevent heat radiation, and the outside is further covered with a protective cover 19. The above-mentioned thermal welding member A is made of a metal with good thermal conductivity such as stainless steel or brass, and the block 14 is preferably made of brass. 20 is the block 14 excluding the heat cutting and welding member A part.
A donut-shaped radiant heat shielding plate (also called a cooling film holding plate) installed at a position slightly away from the top surface.
A cooling water pipe 21 is integrally fixed to a part thereof, and preferably a heat insulating material such as asbestos is attached to the lower surface. The upper surface of this radiant heat shielding plate 20 is normally located above the edge 10, and when the receiving member B descends, it may be provided so that it is pushed down by this, or the edge 10 is a radiant heat shielding plate. Although it may be always projected above the plate 18, in this case, it is necessary to provide a plate spring 22 or the like that pushes the sheet S upward after the receiving member B is raised, near this device.

The receiving member B provided above in correspondence with the above-mentioned thermal welding member A is usually made of a material having heat resistance, non-fusion properties that prevent melted sheet materials from adhering, and elasticity, and is optimal. Silicone rubber is preferable, but ordinary synthetic rubber or silicone rubber with glass wool or Teflon cloth attached to the surface may also be used. The lower surface of this receiving member B has a sufficient area to come into pressure contact with all of the edges 10, and its holder 23 is installed in a vertically slidable manner on the supporting member 17 that supports the block 14. At times, the rod 25 is retracted upward by the spring 24, and the upper end of the rod 25, which is integral with the holder 23, penetrates the support member 17 and projects upward, and the upper end has a bolt 26 extending laterally. is screwed in, and the lower limit position of the receiving member B can be adjusted by adjusting the screwing amount of this bolt 26.

(Operation of Example 1) In this device configured as above,
First, the block 14 is heated by applying electricity to the heat source 13 of the block 14, for example, an insulated nichrome coil;
The edge 10 of the thermal cut-off welding member A that comes into contact with this is heated to the thermal melting temperature of the sheet S.

Then, one or two or three stacked sheets S are fed between the edge 10 and the receiving member B, and the upper end of the rod 25 is pushed up against the restoring force of the spring 24, and the receiving member B is The sheet S is pressed against the edge 10 by the lower surface of the sheet S.

In this way, the sheet S is fused into the shape of the edge 10 by the pressing force and the heat of the thermal fusion welding member A, and what is inside the edge 10 becomes fused debris 27 separated from the sheet S, and the space is The melting debris 27 enters the part 12 and gradually melts due to the heat of the heat-cutting welding member A, and its planar shape becomes smaller than the cross-sectional area of the discharge passage, and it flows down due to its own weight and is discharged from the device. be done.

In addition, the fusing edge of the sheet S that is in contact with or approaching the outside of the edge 10 is melted, and when two or more sheets S are overlapped, a non-fusing agent (including printing ink) is applied to the mating surfaces. The upper and lower sheets will be fused to each other unless they are made of similar materials.

When the pressing force applied to the receiving member B is removed, the restoring force of the spring 24 causes the receiving member B to return upward.

Thereafter, the sheet S is sequentially supplied between the edge 10 and the receiving member B to be cut and welded, and the same operation is repeated.

Embodiment 2 Next, an embodiment of the third device invention as set forth in claim 11 will be described based on FIGS. 1 and 2.

In the device of the second invention described above, a transport path is formed for supporting the sheet S with guide rollers 27 and 28 and transporting the sheet S in the horizontal direction (see Fig. 2). By conveyor 29,
The sheet S is arranged to be transported intermittently, and the thermal welding member A of the above-mentioned apparatus is located at the lower side of this transport path, and the receiving member B is located at the upper side. , when the sheet S is transferred, the sheet S is attached to the thermal welding member A and the receiving member B.
It is provided at an intermediate position where it does not come into contact with any of the above. The other configurations are the same as the first invention.

(Operation of Embodiment 2) In this Embodiment 2, the receiving member B descends each time the conveyor 29 stops, that is, each time the sheet S stops, and first hits the sheet S, bending it downward and pressing it down while the heat-sealing welding member A Edge 10
Press to return to the original position.

The rest is the same as in Example 1.

Other Examples FIGS. 8 and 9 show examples in which the shape of the fusing edge of the thermal welding member A is bent or curved. The edge 10 in FIG. 8 is V-shaped, and the edge 10 in FIG. 9 is U-shaped, and a flat U-shaped welding surface 10a is provided on the outside. This is also an example of the implementation section described in scope item 7.

An embodiment of the embodiments described in claims 4 and 6 to 8 is shown in FIG. The constituent members are formed from separate members, and these members are combined to form the heat-fusion welding member A.

An example of the embodiment described in claim 5 is shown in FIGS. 8 and 9.

In the case shown in FIG. 6, the edge 10 is a closed loop, and the thermally welded member A is made of a single member.

An example of the embodiment described in claim 9 is shown in FIG. 9, in which a heating source 13 is embedded in the thermally welded member A.

Embodiments according to claims 10 and 12 are shown in FIGS. 1 and 6 to 9, respectively, in which the transverse plane of the lower part of the space 12 is smaller than the planar shape of the edge 10. It is widely formed.

The thermal welding member A of each embodiment of the embodiments described in claims 3 to 10 above is appropriately selected and used depending on the purpose.

C. Effects of the invention In the first method invention of the present invention, which is configured and operated as described above, two or more sheets to be welded and cut by the edge are fused at the edges thereof. , and are welded to each other, and since the cut debris 27 enters the space 12, it is intermittently heated from the surroundings therein, and the periphery of the cut debris 27 is fused, its planar shape becomes smaller, and it is discharged downward. Fall down the aisle.

Therefore, even if the fusing and welding operations are repeated one after another, the fusing debris 27 will fall down one by one, and no special device is required to remove the debris, just a trash box or similar.

The device invention, which is the second invention, is capable of implementing the method invention described above, and since the receiving member B has the above-mentioned characteristics, the fusing debris 27 does not adhere to the receiving part.
It has the effect of ensuring that it falls downward.

When the fusing debris 27 is a small and thin sheet (or film) S, the fusing debris 27 is almost molten and flows down the discharge passage.

When the melted debris 27 is large and thick, only the periphery is melted and the size becomes smaller, and parts of the debris are sequentially fused in the vertical direction and flow down the discharge passage.

In addition, the welded edge remaining on the sheet side becomes molten due to the heat and pressure when the receiving member B is pressed against the edge 10, and can weld two or more sheets S together, or in the case of woven fabric, It has the effect of welding the weaving threads of the welded edge to each other.

Whether this device supplies the sheets S sequentially manually or if an automatic supply device is added, the present invention will not change in any way.

In addition to the effect of the second invention, the effect of the third invention is that when the sheet S is transported, the sheet S is transported in a state separated from the thermal welding member A and the receiving member B. It is not affected by frictional resistance or heat, and there is no risk of damaging the sheet S.

In particular, the effect is remarkable when the radiation heat shielding plate 20 is used.

In addition, the thermal welding member A described in claim 3 is installed in the block 14 in a detachable manner, and the shape and dimensions of the edge 10 of the thermal welding member A are different, such as those shown in FIGS. 4 and 5. If several types of parts as shown in the figure are prepared, only this member can be replaced as needed, and there is no need to attach the lead wire of the heating source, making handling convenient.

If you use something like this, you can
You can make holes for hanging display bags as shown in Figure 3, and holes for rope insertion in sunshade sheets.

Edge 10 according to the embodiment of claim 4
In the case of a thermally fused welding member A having a closed loop, a hole can be punched out and the periphery of the hole can be welded.

Furthermore, when the edge 10 has a V-shaped, U-shaped, or U-shaped planar shape, the open end of the edge can be used to reach the side edge of the sheet S, thereby making it possible to extend the width of the sheet S. It has the effect of making it possible to weld the notch in the corner and weld the periphery thereof, and is suitable for cutting the corner of the bag as shown in FIGS. 15 and 16.

When the thermal welding member is in the form of a connected body of two or more members (see FIGS. 7 to 9), this member is suitable for large-sized or complex-shaped members.

In those having a slightly flat welding surface 10a on the outside of the edge 10 (see FIG. 6), the sheet S
This creates a welding surface that is slightly wider than the welded edge, improving welding strength. Therefore, when a shape as shown in FIG. 10 is thermally cut and welded, it is suitable for drilling a hole in the handle portion of a shopping bag shown in FIG. 14.

Thermal welding member A has an inner cylinder _A1 having a closed loop edge 10, an outer cylinder _A2 having a closed loop welding surface 10a,
In the case of the fitted body of A ₃ ...... (see Fig. 7), the outer cylinders A ₂ , A ₃ ... should be separated from the inner cylinders by carving knurls such as gables on the welding surface 10a. If the edge 10 is worn and re-sharpened and the height becomes shorter, the bottom of the outer cylinders A ₂ and A ₃ can be polished to reduce the height, and the welded surface can be re-sharpened to improve the knurling. You don't have to stand. An embodiment in which the heating source is provided in the thermal welding member A itself does not require a heating block, has a simple structure, has good heat conduction efficiency, and is suitable for work involving a large number of lots.

(Effects Unique to the Embodiment) When the receiving member B separates from the heat-cutting and welding member A, the spring 22 is provided, whereby the sheet S is sprung upward from the edge 10 and separated. If the radiant heat shielding plate (also referred to as a cooling film holding plate) 20 is movable, this radiant heat shielding plate 20
As a result, the sheet S is separated from the edge 10. The motions of the receiving member B and the thermal welding member A are relative, and the present invention is the same whether either one of them operates or both of them approach and separate from each other.

In addition, since the lower part of the space 12 has a large inner diameter, there is no fear that the space 12 will be clogged with cutting debris 27 due to the heating of the thermal welding member.

If the apparatus of the present invention is incorporated into a part of a bag making machine as shown in FIG. 2, it can perform fusing holes and corner cutting operations at the same time as bag making operations.

[Brief explanation of drawings]

The drawings show typical embodiments according to the present invention, in which Fig. 1 is a schematic side view of the entire embodiments 1 and 2, Fig. 2 is a perspective view of the main part thereof, and Fig. 3 is an enlarged longitudinal sectional front view. 4 and 5 are perspective views of each embodiment of a closed-loop edge type heat-cutting welding member, and FIG. 6 is a longitudinal sectional front view of each embodiment of a heat-cutting welding member having a welding surface on the outside of the edge. 7 are longitudinal sectional front views of internal and external cylindrical thermal melting and welding members, FIGS. 8 and 9 are perspective views of respective embodiments of V-shaped and U-shaped heat melting and welding members,
FIG. 10 is a perspective view of each embodiment of a large thermal welding member, FIGS. 11 and 12 are perspective views of a display bag,
Fig. 13 is a perspective view of a sunshade tent, Fig. 14 is a perspective view of a handbag, Fig. 15 is a perspective view showing a method of processing a square gusset bag, and Fig. 16 is a perspective view showing a method of processing a bag with a lid. It is. Symbols in the figure, A...thermal welding member, B... receiving member, 10... edge, 12... space, 13...
Heat source, 14...Block, 15...Escape hole, 2
0... Radiation heat shield plate, 21... Cooling water pipe, 30...
...Drilling position adjustment mechanism.

Claims (1)

[Scope of Claims] 1. A thermal welding member heated above the melting point of the sheet to be welded, with the edge for thermal welding facing upward, and between it and a receiving member disposed above the welding member,
Two or more sheets to be melted and welded are supplied, and the sheets are sandwiched between the thermally cut and welded member and the receiving member, and the sheets in the area surrounded or sandwiched by the edge are separated from the sheets in other parts. The method includes a method of fusing to produce fusing waste, welding the fusing edges of two or more superimposed sheets to each other, and separating the heat fusing welding member from the sheet, and using the edge of the heat fusing welding member. In a discharge passage formed vertically penetrating the surrounding or sandwiched area, the heat of the heat-sealing welding member heated above the melting temperature of the sheet sequentially melts the cutting debris and causes it to flow out of the discharge passage. A heat-fusible sheet fusing and welding method consists of a method in which the sheet is discharged by its own weight. 2. A thermal welding member made of a good thermal conductor has upward thermal cutting edges in a horizontal plane, and the edges have a closed loop, bent or curved shape, and the area surrounded or sandwiched by the edges In the thermal cutting welding member, a vertically penetrating space is formed, and a discharge passage is formed from the space below the edge to the support member below this, through which the molten resin of the cutting debris flows down. A receiving member whose lower surface portion is made of a heat-resistant, non-fusion, and elastic material is provided above the thermally welding member, and the edge portion of the thermally welding member and the lower surface of the receiving member are disposed above the thermally welding member. A heat-fusible sheet melt-cutting welding device characterized by being equipped so that it can press and separate in the vertical direction relative to the top and bottom. 3. Claim 2, characterized in that the thermal welding member is made of a metal body with good thermal conductivity, and is detachably fitted into a hole or notch that penetrates in the vertical direction of a block equipped with a heating source. The heat-fusible sheet fusing and welding device described in 2. 4. The heat-fusible sheet fusing according to claim 2 or 3, wherein the planar shape of the edge of the heat-fusing welding member forms a closed loop, and the heat-fusing welding member has a pipe shape. Welding equipment. 5. The heat treatment according to claim 2 or 3, characterized in that the planar bent or curved shape of the edge of the thermal welding member is one of a V-shape, a U-shape, and a U-shape. Weldable sheet cutting and welding equipment. 6. The heat-fusible sheet melt-cutting and welding apparatus according to claim 2, 3, 4, or 5, wherein the heat-welding melt-cutting member is composed of a connected body of two or more members. 7. Thermal weldability according to claim 2, 3, 4, 5, or 6, which is a heat-welded and fusing member having a slightly flat welding surface on the outside of the edge. Sheet cutting and welding equipment. 8. Claims 2, 3, 4, or 8, characterized in that the thermal welding member is a fitted body of a cylinder having a closed-loop edge and at least one outer cylinder having a closed-loop welding part. 8. A heat-fusible sheet melt-cutting and welding device for the heat-fusible sheet described in item 7. 9. Claims 2 and 4, characterized in that the thermal welding member itself is equipped with a heating source.
A heat-fusible sheet melt-cutting and welding device according to the heat-fusible sheet according to item 1, 5, or 7. 10. Claims 2 and 3, characterized in that the planar shape of the lower part of the discharge passage is wider than the planar shape of the space near the edge.
The heat-fusible sheet melt-cutting and welding apparatus according to item 1, 4, 5, 6, 7, or 8. 11 An intermittent transfer device that intermittently transfers sheets to be welded in the horizontal direction, and a thermal welding member having an upwardly facing edge for thermal welding in a horizontal plane slightly below the conveying path surface of the sheet transferred by this device. On the other hand, above the transfer road surface, there is provided a receiving member whose lower surface portion is made of a heat-resistant, non-fusion, and elastic material, and each time the intermittent moving device stops, the above-mentioned heat-cutting and welding member is removed. The edge part and the lower surface part of the receiving member are installed so that they can be pressed against each other from above and below, and the planar shape of the edge is a closed loop, bent, or curved shape, and the edge part is surrounded by or sandwiched between the edges. In the area, a space is formed in the heat-cutting welding member in the vertical direction, and a discharge passage is formed in which the molten resin of the cutting debris flows from the space below the edge to the support member below this. 1. A heat-fusible sheet fusing/welding device, characterized in that: 12. The heat-fusible sheet fusing and welding apparatus according to claim 10, wherein the planar shape of the lower part of the discharge passage is wider than the planar shape of the space near the edge.