JPH03266630A - Joining of plastic corrugated board and apparatus for joining of plastic corrugated board - Google Patents

Abstract

PURPOSE:To make automation easy, to improve strength and to join plastic corrugated boards by piling two sheets of plastic corrugated boards through a heating member, pressing the outer face of the corrugated board by means of a receiving member and a pressing member, melting a liner and pulling the heating member out in the face direction of the plastic corrugated board. CONSTITUTION:A lap joint part 11 of a corrugated board stock 1 is folded by being guided by means of the first bending guide piece and in addition, the second bending guide piece folds the first side face flap 12. Driving cylinders 28 and 28 are actuated and pressing member 18 and 18 fold the second side face flaps 17 and 17 and pile the lap joint parts 11 and 11 and a press plate 25 presses the second side face flap 17 and the lap joint part 11 to a receiving member 14 side and the lap joint part 11 and the second side face flap 17 pinch a heating member 20 and heat of the heating member 20 melts both liners. When a driving mechanism 16 for the heating member is actuated in the reverse direction, the heating member 20 is retreated and pulled out between the lap joint part 11 and the second side face flap 17 and parts to be joined of the lap joint piece 11 and the second side face flap 17 are surely welded.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention involves interposing a heating member between the parts of two stacked plastic cardboards to be joined, and heating both liners while melting them. The present invention relates to a plastic cardboard joining method and a plastic cardboard joining apparatus in which both plastic cardboard boxes are fused and joined by pulling out a member.

<Prior art> As is well known, plastic corrugated board is made by arranging two thin plastic liners with a gap of several 1 cm between them, and separating each liner with a thin plastic partition plate of several 1 cm in width. -It is made of board material connected at a pitch of 1, and has been in high demand in recent years because it has superior strength and water resistance compared to paper cardboard.

Conventionally, to join such plastic cardboard,
Two pieces of plastic cardboard were stacked one on top of the other and held together by driving tacks or Stella pulls, or they were stuck together using adhesive.

(Part 1 of the invention) However, when joining using rivets, it is difficult to obtain sufficient joining force, and there are drawbacks such as rusting of the Stella pull and rivets. Furthermore, when automating the work of driving stere pulls and rivets, the number of steps is large and the structure of the device becomes complicated, which is not easy.

In addition, when bonding using adhesive, the strength of the bonded part is low and it easily peels off because adhesives for plastic cardboard have not yet been sufficiently developed, and the adhesive strength weakens at low or high temperatures. There were some drawbacks, such as:

For this reason, it has been desired to develop a method and device for joining plastic cardboard that is easy to automate and has excellent strength.

Means for Solving the Problems> The present invention has been proposed in view of the above, and the joining method is to overlap two plastic cardboards with a heating member interposed between the parts to be joined. The outer surface of the plastic cardboard is sandwiched and pressurized between the receiving member and the pressing member, and in this state, the heating member is pulled out in the direction of the surface of the plastic cardboard while melting the liner at the part of the plastic cardboard that is to be joined by the heat of the heating member. The method is characterized in that two sheets of plastic cardboard are fused together by solidifying a molten liner.

In addition, as a joining device, a receiving member that comes into contact with one plastic corrugated board, a part of the plastic corrugated hole to be joined and a part of the other plastic corrugated board stacked on the plastic corrugated board to be joined, is interposed between the two plastic corrugated boards. a heating member that melts the liner, a pressing member that presses the outer surface of the other plastic cardboard toward the receiving member, and a state in which the polymer of both plastic cardboards and the heating member is sandwiched between the pressing member and the receiving member. and a heating member drive mechanism that pulls out the heating member in the direction of the surface of the plastic cardboard.

<Operation> One of the plastic cardboards is brought into contact with or facing the receiving member, and the heating member is advanced to the part of the plastic cardboard to be joined by operating the heating member drive mechanism, and the heating member is sandwiched between the two. Lay the other plastic cardboard on top of the one plastic cardboard. Then, the outer surfaces of both plastic cardboard boxes are sandwiched and pressurized between the receiving member and the pressing member, and in this state, the heating member drive mechanism is operated while the liner of the part of the plastic cardboard boxes to be joined is melted by the heat of the heating member. As a result, the heating member is pulled out in the direction of the surface of the plastic corrugated board. When the heating member is pulled out, the molten parts of the liners of both plastic corrugated holes are united by the pressure of the pressing member, and this molten part solidifies, thereby forming the two sheets. Plastic cardboard or fused.

<Example) Embodiments of the present invention will be described below based on the drawings.

In the embodiment shown in the drawings, a box body 2 whose top surface is open is manufactured from a single sheet of plastic corrugated paperboard 1. As shown in FIG. , cut portions 3... are formed. In FIG. 1, the two-dot chain line indicates a bending line, and the diagonal line indicates a portion to be joined. It is preferable to crush the portion along the bending line in advance to make it easy to bend.

The plastic cardboard base paper 1 is stacked and stored in a paper feeder M4 shown in FIG. They are joined by the device 7 and formed into the box body 2.

As shown in FIG.
. . and a vertically movable button 10 that pushes down the bottom flap 9 of the plastic corrugated paperboard 1 with its abutting portion at the lower end, and an overlapping margin 11 of the plastic corrugated paperboard 1 that curves upward or outward, and the first side surface. Flap 12...
・Bending guide piece 13 that bends etc. on the way down...
A joining device 7 is provided at the lower part of the bending guide piece 13. By appropriately adjusting the height of the upper end of the bending guide piece 13, the order in which the flaps are bent can be set.

The bonding device 7 includes a plate-shaped receiving member 14 provided at the lower part of the vertically movable bushing lO, and two heating members 15 that can move forward and backward at an interval approximately equal to the thickness of the base paper 1 on the outer surface side of the receiving member 14. and,
a heating member drive mechanism 16 that drives each heating member 15;
The second side flap 17 of the plastic cardboard base paper 1
It consists of a pressing member 18, 18, etc. that presses the... As shown in FIG. 7, the heating member 15 includes a heat source 19 such as a nichrome wire or a season wire, and a metal plate that contacts and transfers the heat from the heat source 19 to the plush cardboard. It consists of a heating element 20 and the like. A heating member drive mechanism 16 that drives the heating member 15 includes a slider 22 that supports the heating member 15 and is movable back and forth along a guide rail 21.
It consists of a cylinder 23 connected to the slider 22, etc., and a guide rail 21 is installed facing a predetermined position to be joined. Therefore, when the heat source 19... is energized, the temperature of the heating element 20 rises sufficiently to the plastic melting temperature, and when the cylinder 23 is actuated, the cylinder rod 23''
By expanding and contracting, the heated heating element 20 can be advanced from the standby position shown by the solid line in FIG. 7 to the heating position shown by the chain line, or can be moved back from the heating position to the standby position. In the embodiment shown in FIG. 1, the pressing member 18 has its lower end pivoted, and a pressing plate 25 is movably supported on the upper end of the rotating plate 24 by means of a pin 26, and the pressing plate 25 is supported by a coil spring 27 as a biasing member. A drive cylinder 28 is connected to the pivot plate 24 near its base end.

Therefore, when the drive cylinder 28 is activated.

Rotating the rotating plate 24 in the standby state shown by the chain line in FIG. 6,
It is possible to convert to the pressurized state shown by the solid line in FIG. Then, when the pressurized state is changed, the pressurizing plate 25 presses the outer surface of the plastic corrugated board, which will be described later, while maintaining its elasticity.

Next, a process for manufacturing a box 2 from a plastic corrugated cardboard base paper 1 using the joining device 7 having the above-described configuration will be described.

When the box W16 is lowered while being in contact with the contact part of the button 10 or the corner part of the bottom flap 9 of the plastic corrugated paperboard l, the polymerization distance 11 of the plastic corrugated paperboard l pushed down by this is lowered. It is guided by the first bending guide piece 13, that is, the highest bending guide 13 at the upper end position, and is gradually bent upward, and when it is further lowered, the second bending guide piece 13 or the first side flap 12 is gradually bent upward. Fold. In addition, the joint generation 1
1 is made of bone and the first side flap 12 is opened without opening.
It is regulated by the kite so that it is almost at right angles to. In this way, both temperature 1 side flaps 12,
12 and overlapping section 11-... stand up at almost right angles to the bottom flap 9, the heating member drive mechanism 16... is operated to advance each heating element 20 from the standby position and bending overlapping section 11--. Proceeding to the part to be joined on the outside of the base end, and when it comes into contact with the bent base end of the heating element 20 or the overlapping margin 11,
It is possible to prevent the polymerization gap 11 from opening due to its elasticity.

Around this time, the driving cylinder 28.28 is activated, so the pressing member 18.18 changes from the state shown by the chain line in FIG. 6 to the state shown by the solid line, and the second side flap 17.17
At the same time, each second side flap 17 is overlapped with the overlapping margin 11.11, and the pressure plate 25 is bent over the second side flap 17.
The tube 17 and the overlapping margin 11 are pressed against the receiving member 14, and the overlapping margin 11 is formed in the area to be rejoined! 8282 The uneven wrap 17 or the heating element 20 is sandwiched. Therefore, the heat of the heating element 20 is transferred to the portion to be rejoined, and both liners are melted from the surface. In this state, when the heating member drive mechanism 16 is operated in the opposite direction, the heating element 20
It then retreats and is pulled out from between the overlapping margin 11 and the second side flap 17. During the retreat of the heating element 20, the pressure plate 25 continues to press the second side flap 17 and the overlapping margin 11 in an elastic state, so that the melted portions of both liners separated from the heating element 20 are immediately released one after another. They are brought into contact and integrated, and are sequentially hardened by natural cooling for 1J. Therefore, by the time the heating element 2o retreats to the standby position, the portion of the overlapping margin 11 to be joined and the portion of the second side flap 17 to be joined are reliably fused.

The plastic cardboard box 2 formed in this way falls onto a conveyor 29 such as a belt conveyor, and is carried out from the box making device 16 by the operation of the conveyor 29.

The heating element 20 of the heating member 15 is heated by a microcomputer in order to be kept at a temperature just enough to melt the surface of the liner, and to be positioned between the plastic cardboard boxes for a sufficient amount of time to melt the surface of the liner just enough. It is controlled by a control device (not shown) such as the above. In addition, the pressing member 18
The controller is also controlled to operate at a predetermined timing.

Further, the present invention is not limited to manufacturing the box 2, but can be widely used for joining two plastic cardboards together.

<Effects of the Invention> As explained above, according to the present invention, unlike local joining using rivets or stellar pulls, it is possible to join two plastic cardboards over a certain area, and moreover, it is possible to join two plastic cardboards together over a certain area. Because fusion bonding involves melting and bonding, it can be expected to have significantly higher strength than bonding using conventional bonding methods, and it also has excellent water resistance and does not deteriorate in strength due to temperature changes unlike adhesive bonding. Also,
Since it is possible to join reliably with an extremely simple process,
It is easy to automate, and can improve work efficiency by several steps compared to conventional methods.6 Furthermore, it does not require other materials such as adhesives or sterapure, so costs can be reduced.

[Brief explanation of drawings]

The drawings show an example of manufacturing a box from plastic corrugated cardboard. Figure 1 is a plan view of the plastic corrugated cardboard in the unfolded state when making the box, and Figure 2 shows the first side flap and Fig. 3 is a side view of the completed box;
The figure is a schematic front view of a box making device equipped with a joining device, FIG. 5 is a plan view of the joining device, FIG. 6 is a partially cutaway front view of the joining device shown in FIG. 5, and FIG. 7 is a heating member. and a front view of the heating member drive mechanism, and FIG. 8 is a plan view in a state where the heating member is inserted between stacked plastic cardboards. In the figure, l is a plastic cardboard base paper, 2 is a box, 6 is a box making device, 7 is a joining device, 11 is a polymerization margin, 12 is a first side flap, 14 is a receiving member, 15 is a heating member, 16 is a heating device Drive mechanism for members, 17 is tJ42 side flap, 18
19 is a heat source, 20 is a heating element, 23 is a cylinder for driving the heating member, 25 is a pressure plate, 27 is a coil link, and 28 is a cylinder for driving the pressing member.

Claims (2)

[Claims] (1) Two plastic cardboards are stacked with a heating member interposed between the parts to be joined, and the outer surfaces of both plastic cardboards are sandwiched and pressed between a receiving member and a pressing member, and in this state, the heating member is The heating member is pulled out in the surface direction of the plastic cardboard while melting the liner at the part where the two plastic cardboards are to be joined by the heat, and the two plastic cardboards are fused together by solidification of the melted liner. Joining method. (2) Melting the liners of both plastic cardboards by intervening between the receiving member that one plastic cardboard comes into contact with, the part of the plastic cardboard that is to be joined, and the part of the other plastic cardboard that is overlapped with the plastic cardboard that is to be joined. A heating member, a pressing member that presses the outer surface of the other plastic cardboard toward the receiving member, and a polymer of both plastic cardboards and the heating member being sandwiched between the pressing member and the receiving member, and the heating member is pressed against the plastic. A plastic corrugated board joining device consisting of a heating member drive mechanism that pulls out the corrugated board in the surface direction.