JPH0340855A - Device for preparing lattice-like thermoplastic web - Google Patents

Abstract

PURPOSE:To provide the subject device giving a high quality lattice-like web because of stably enabling to melt-bond the cross portions of tape groups by equipping a specific thermally melt-bonding device for melt-bonding the cross portions of a longitudinal direction group with a transverse direction group, the groups crossing with each other. CONSTITUTION:A longitudinal direction tape group and a transverse direction tape group each comprising a plurality of parallelly disposed thermoplastic resin tapes are orthogonally disposed on a table 1. Both the tape groups 2 are pressed on the table 1 with a thermally melt-bonding device 3 and the cross portions thereof are simultaneously melt-bonded to prepare a lattice-like thermoplastic web. The thermally melt-bonding device 3 has heat plates 4a-4c for pressing both the tape groups 2, a heat source 8 capable of separately heating the peripheral and central portions of the heat plates, a temperature sensor 9 capable of separately detecting temperatures at the peripheral and central portions of the heat plates, upper side plates 5 positioned above the heat plates and many press screws 7 and many pull screws 6 for adjusting the flatness of the heat plates.

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Field of Application) The present invention relates to an apparatus for producing a resin web formed in a lattice shape from longitudinal tapes and transverse tapes, and particularly to The present invention relates to an improvement in a heat fusing device for heat fusing parts.

(Prior Art) Conventionally, when producing a lattice-like web, a method has been adopted in which a finely slit resin tape is hung on a loom to be threaded. There are two types of looms: one type that uses a shuttle to pass the horizontal tapes one by one in a perpendicular direction to a group of vertical tapes stretched long on a flat surface, and the other type that uses vertical tapes arranged in a cylindrical shape. On the other hand, there is a type in which several lateral tape supply heads are rotated at right angles to produce a cylindrical fabric.

(Problems to be Solved by the Invention) In the conventional method for manufacturing a lattice-like web, the former type of wire raising in a flat plate shape is one in which one tape is passed between the vertical tape groups arranged in the vertical direction in the horizontal direction. It is necessary to pass a horizontal tape through the tape, and the latter type, which is raised in a cylindrical shape, has a limit to the number of horizontal tapes that can be passed through each time, so both have the problem of slow production speed.

In addition, since all of the above types use a method to raise the tape, unlike when targeting fibers, there is a problem that the tape tends to twist easily, and if you try to create gaps between tapes, the tape Since the intersections are not fixed, the tapes in both directions tend to shift easily, making it impossible to produce a web with a constant inter-tape gap.

Therefore, in some cases, a longitudinal tape group consisting of a plurality of juxtaposed thermoplastic resin tapes and a horizontal tape group consisting of a juxtaposed plurality of thermoplastic resin tapes are arranged orthogonally on a table, and both An apparatus for producing a lattice-shaped thermoplastic tape has been proposed in which a group of tapes is pressed onto a table by a heat-sealing device, and the intersection portions of both tape groups are heat-sealed to produce a lattice-shaped web.

By the way, in this type of lattice-shaped thermoplastic web manufacturing equipment, if the heat fusion device has a hot plate structure in which the heat source is attached to two metal plates, it is difficult to make the temperature of each part of the hot plate uniform. In addition, there is a risk that the hot plate may warp due to heating, making it impossible to obtain a perfect flat surface, making it impossible to apply a uniform pressing force to both tape groups. In this case, there is a problem that the thermal bonding force at the intersection of both tape groups is not stable.

The present invention was made with these points in mind, and it is possible to correct the warpage of the hot plate caused by heating to make it perfectly flat, and to make the surface temperature of the hot plate uniform. The purpose of the present invention is to provide an apparatus for producing a lattice-like plastic web.

[Structure of the invention]

(Means for Solving the Problems) As a means for achieving the above object, the present invention provides a heat fusion device that includes a hot plate that presses both vertical and horizontal tape groups, and at least the periphery and center of the hot plate. a heat source capable of heating the parts separately; a temperature sensor capable of separately detecting at least a peripheral part and a central part of the heating plate; an upper plate located above the heating plate; It is characterized in that it is comprised of a large number of push screws and pull screws arranged between the hot plate and the hot plate to adjust the flatness of the hot plate.

(Function) In the lattice-shaped thermoplastic web manufacturing apparatus according to the present invention, the hot plate of the heat fusion device is heated by the heat source, and its temperature is detected by the temperature sensor.

By the way, when the hot plate is heated, the temperature of the peripheral part of the membrane becomes lower than that of the central part due to heat radiation. Therefore, the heat source can separately heat at least the peripheral part and the central part of the hot plate, and the temperature sensor can also separately detect at least the peripheral part and the central part of the hot plate. This makes it possible to equalize the temperature of the hot plate.

In addition, the heating plate warps due to rising temperatures, but by adjusting the numerous push screws and draw screws between the upper plate and the heating plate, it is possible to make the bottom surface of the heating plate flat. .

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

1 and 2 show an example of the apparatus for producing a lattice-like thermoplastic web according to the present invention. In the figures, reference numeral 1 is a table for heat fusion processing, At the upper position, a group of tapes 2 arranged orthogonally are stretched.

This tape group 2 is a state in which a vertical tape group consisting of a plurality of thermoplastic resin tapes arranged side by side and a horizontal tape group consisting of a plurality of thermoplastic resin tapes arranged side by side are placed close to each other in the vertical direction. The tape group 2 is sandwiched between the table 1 and a heat-sealing device 3, which will be described later, and is heated under pressure to form tape groups in both the vertical and horizontal directions. The intersections are heat-sealed to form a lattice-like plastic web.

As shown in FIGS. 1 to 3, the heat fusing device 3 includes a hot plate 4a divided into three parts in the width direction of the tape group 2,
4b, 4c, and these hot plates 4a.

and an upper plate 5 located above 4b and 4c,
Each hot plate 4a, 4b, 4c and the upper plate 5 are connected by a large number of draw screws 6 and push screws 7, and both of these screws 6,
7, each hot plate 4a,
The flatness of 4b and 4c can be adjusted.

Each of the hot plates 4a, 4b, and 4c is made of an aluminum alloy with excellent thermal conductivity and oxidation resistance, and as shown in FIGS. A plurality of strip heaters 8, which can be controlled by heating, are regularly divided and arranged, so that it is possible to equalize the temperature of the peripheral part and the central part of each hot plate 4a, 4b, 4c as a whole. Furthermore, a temperature detection sensor 9 for temperature control is provided at the center of any strip heater 8, as shown in FIG. As shown in FIGS. 3 and 4, the pull screws 6 and the push screws 7 are distributed over the entire area of each hot plate 4a, 4b, and 4c, avoiding the installation position of the strip heater 8. .

As shown in FIG. 5, the draw screw 6 is inserted into a hole 5a provided in the upper plate 5, and is rotatable while being prevented from being removed by upper and lower retaining rings 10. The male threaded portion 6a is screwed into a female threaded portion 11 provided on the hot plates 4a, 4b, and 4c. By rotating the draw screw 6 forward and backward, the amount of engagement between the male threaded portion 6a and the female threaded portion 11 changes, and the distance between the upper plate 5 and the hot plates 4a, 4b, and 4c is adjusted. .

Further, as shown in FIG. 6, the push screw 7 is threaded into a screw hole 5b provided in the upper plate 5, and its lower end is in contact with the upper surface of the hot plates 4a, 4b, 4c. There is. Then, by screwing the push screw 7 downward, the hot plate 4a
, 4b, and 4c are pressed downward, and the distance between them and the upper plate 5 is adjusted in the expansion direction.

On the other hand, a frame 12 is disposed above the upper plate 5, as shown in FIGS. 1 and 2.
and the upper plate 5 are connected via a plurality of connecting members 13.

As shown in FIGS. 1 and 2, the frame 12 is driven up and down by a lifting device 14, and a plurality of split weights 15 are placed on the top surface of the frame 12. It has become. The elevating device 14 only raises and lowers the heat-sealing device 3, and the pressing force of the hot plates 4a, 4b, and 4c against the tape group 2 is exclusively provided by the weight of the weight 15. The pressing force is changed by changing the amount of the weight 15.

Next, the operation of this embodiment will be explained.

When producing a lattice-like thermoplastic web, a group of tapes 2 is stretched on a table 1, and then each strip heater 8 is
energized to heat the hot plates 4a, 4b, and 4c.

By the way, when the hot plates 4a, 4b, and 4c are heated, the temperature of the peripheral portion as a whole becomes lower than the temperature of the central portion due to heat radiation. Therefore, each temperature detection sensor 9 detects this temperature to make the overall temperature uniform.

Further, the hot plates 4a, 4b, and 4c are warped by heating. Therefore, the draw screw 6 and the push screw 7 are adjusted so that the lower surfaces of the hot plates 4a, 4b, and 4c become flat.

Next, the heat fusion device 3 is lowered by the lifting device 14,
The lower surfaces of the hot plates 4a, 4b, and 4c are brought into contact with the tape group 2. Then, the tape group 2 is pressed by the weight of the weight 15 while being heated by the heat from the hot plates 4a, 4b, and 4c. As a result, the intersections of the longitudinal tape group and the lateral tape group are thermally fused, producing a lattice-like web.

By the way, the width of the lattice thermoplastic web varies depending on the purpose of use. At this time, hot plates 4a, 4b for heat fusion,
If 4c is formed of a single metal plate, there is a risk that it will interfere with a chuck or the like for pulling out the horizontal tape group.

Therefore, in this embodiment, in such a case, the hot plate 4b,
4c or only the hot plate 4C is removed.

This removal can be easily performed by removing the draw screw 6 and push screw 7. At this time, the hot plate 4b is used as necessary.

The weight 15 located directly above 4C may be removed.

In this way, a plurality of strip heaters 8 are installed on the hot plates 4a, 4b, 4c, and these are controlled independently of each other by signals from the temperature detection sensor 9. , 4c, the overall temperature can be made uniform even if the heat is radiated from the peripheral portions of the parts.

In addition, the hot plates 4a, 4b, and 4c will warp due to heating, but with the large number of draw screws 6 and push screws 7,
Since this can be corrected, the hot plates 4a and 4b
, 4c can be made completely flat. Therefore, together with the uniform temperature, the strength of the heat-sealed portion can be stabilized.

Further, the pressing force applied to the tape group 2 from the hot plates 4a, 4b, and 4c is not obtained by mechanical force such as an air cylinder or a screw jack, but is obtained by the weight of the weight 15. Pressure is applied evenly to each part of the hot plates 4a, 4b, and 4c without being applied locally. Therefore, thermal fusion can be stabilized.

Further, since three hot plates 4a, 4b, and 4c are used, the width of the hot plates can be adjusted according to the width of the lattice-shaped thermoformable web to be manufactured. And at this time,
The width of the hot plate can be adjusted simply by removing the pull screw 6 and the push screw 7, making the work easy.

The inventors have determined that the total area of the hot plates 4a, 4b, and 4c is 1
Using a heat fusion device 3 measuring 600 mm x 500 mm,
Heat-sealing was performed on tape J-2 having approximately 3,000 intersections.

As a result, the fusion at all intersections was strong, and there was no peeling during secondary processing after fusion.

Furthermore, it was found that the temperatures of the hot plates 4a, 4b, and 4c were uniform throughout, with almost no temperature difference, and there was no problem at all with thermal fusion.

In the above embodiment, the hot plate 4a has a three-part structure;
Although the case where 4b and 4c are used has been described, it may be divided into two or four or more. Further, the strip heater 8 and the temperature detection sensor 9 are not limited to the arrangement and number of the strip heater 8 and the temperature detection sensor 9 as in the above embodiment, as long as they can separately control and detect at least the peripheral portion and the central portion of the hot plate.

〔Effect of the invention〕

As explained above, the present invention uses a heat source that can separately heat at least the periphery and the center of the hot plate as a heat source that heats the hot plate, and uses a heat source that can separately heat at least the periphery and the center of the hot plate as a temperature sensor. Since a device that can be detected separately is used, even if heat is radiated from the periphery of the hot plate, the entire eight plates can be kept at a uniform temperature.

In addition, an upper plate is provided above the hot plate, and a large number of push screws and draw screws are arranged between this upper plate and the hot plate to adjust the flatness of the hot plate. Even if the plate is warped, it can be corrected to make the bottom surface of the hot plate flat. For this reason, together with the hot plate being heated to a uniform temperature, it is possible to stably heat-fuse the intersections of tape groups in both the vertical and horizontal directions, creating a high-quality lattice-shaped thermoplastic web. can be manufactured.

[Brief explanation of drawings]

FIG. 1 is a front view showing an example of the apparatus for producing a lattice-like thermoplastic web according to the present invention, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a sectional view taken along the line Figure 4 shows IV-r in Figure 1.
5 is a detailed view showing the structure of the draw screw, and FIG. 6 is a detailed view showing the structure of the push screw. DESCRIPTION OF SYMBOLS 1... Table, 2... Tape group, 3... Heat fusion device, 4a, 4b, 4c... Hot plate, 5... Upper side plate,
6... Draw screw, 7... Push screw, 8... Strip heater, 9... Temperature detection sensor, 14... Lifting device, 15... Weight.

Claims (1)

[Claims] A longitudinal tape group consisting of a plurality of juxtaposed thermoplastic resin tapes and a horizontal tape group consisting of a juxtaposed plurality of thermoplastic resin tapes are arranged orthogonally on a table. A lattice-shaped thermoplastic web production apparatus that presses the web onto a table using a fusion device and heat-seals the intersecting portions of both tape groups to produce a lattice-shaped web, the heat-sealing device comprising: a heat plate that presses the group; a heat source that can separately heat at least a peripheral portion and a central portion of the hot plate; a temperature sensor that can separately detect at least a peripheral portion and a central portion of the hot plate; A lattice heating system comprising: an upper plate located above the heating plate; and a large number of push screws and draw screws arranged between the upper plate and the heating plate to adjust the flatness of the heating plate. Plastic web manufacturing equipment.