JPS593868Y2 - Thermocompression bonding equipment for foam - Google Patents

Description

[Detailed description of the invention] This invention relates to a thermocompression bonding device for foams that applies heat pressure to the overlapping foams coated with a heat-sensitive adhesive at predetermined pressure points to create a bonded foam. It is.

Note that the form referred to in this invention refers to writing paper for envelopes, postcards, cards, slips, booklets, etc. that has a section for writing specified items at a specified position on the sheet, that is, what is generally called a business form. In particular, a heat-sensitive adhesive is applied to a predetermined position, and after predetermined information is filled out, it is folded or overlapped, and heat pressure is applied and glued to immediately ship and use envelopes, postcards, cards, slips, etc. A form used to create forms such as booklets.

Conventionally, the surface temperature of a thermocompression roller used in a foam thermocompression bonding device has been set to a temperature sufficiently higher than the bonding temperature of a heat-sensitive adhesive.

This was because thermal pressure was applied linearly when passing under the roller, but if the temperature of the thermocompression roller was too high,
If the transport of the foam stops for some reason, the paper that is the material of the foam will be burnt.
Two solutions were attempted.

One approach has been to make heat-sensitive adhesives have adhesion capabilities even at low temperatures.

However, if the form is made to have adhesive ability at low temperatures, the necessary information will be written on the form, and while the form is being stored before being overlaid in a prescribed manner, adjacent forms will adhere to each other and the form will become unusable. It was an inconvenience.

Another method was to set the surface temperature of the thermocompression roller close to the bonding temperature of the heat-sensitive adhesive.

However, when the surface temperature of the thermocompression roller is lowered, the conveyance speed of the foam must be reduced, which is inconvenient as it takes time to create the foam.

In addition, attempts were made to increase the number of thermocompression bonding rollers in order to create products without reducing the conveyance speed, but simply increasing the number of thermocompression bonding rollers not only unnecessarily used heat capacity but was also uneconomical. The overall size of the machine made it unsuitable as an office machine.

Therefore, in this invention, we focused on the amount of heat received by the foam when heat is applied to the foam during conveyance, the surface temperature setting of the thermocompression roller when the foam is not conveyed, and the surface temperature during conveyance. The object of the present invention is to provide a thermocompression bonding device for foam that eliminates and improves the drawbacks of the above.

This embodiment will be explained with reference to the drawings. Three pairs of thermocompression rollers l, each consisting of two rollers, transport the stacked foam F with a heat-sensitive adhesive applied to a predetermined pressure point while sandwiching it.
a, lb, and IC are arranged, and these thermocompression rollers are metal rollers with heating elements 2a, 2b, and 2C inside, and the surface temperature of the thermocompression rollers ia and 1a on the carry-in side is lower than that of the middle thermocompression roller. Heat generating elements 2a and 7a are used so that the surface temperature of the thermocompression bonding rollers 1c and 1c on the delivery side of the lb, lb and foam F is set higher than the surface temperature of the rollers 1c, 1c.

When using a heat-sensitive adhesive selected from the bonding condition temperature (softening point) of the heat-sensitive adhesive of about 65°C to 100°C, the surface temperature of the thermocompression roller is The surface temperature of the thermocompression roller 1a on the side is 15
0°C - 180°C, preferably around 170°C, and the surface temperature of the thermocompression roller lb and IC on the unloading side is 90°C.
C to 140 DEG C., which is about 30 DEG C. higher than the bonding temperature of a normal heat-sensitive adhesive, and the temperature may be set or the number of thermocompression rollers on the delivery side may be increased or decreased depending on the conveying speed of the foam.

In addition, 3 is a conveyance roller, 4 is a thermocompression bonding roller la,
This is a heat-retaining board that prevents heat dissipation from the IC and maintains the ambient temperature.The heat-retaining board 4 is mounted on a slide guide 5 and is configured to be able to slide open and close when the form F is stopped being conveyed.

Further, 6 is a stacker for stacking the bonded forms F.

As described above, the foam thermocompression bonding apparatus according to the present invention is configured such that the thermocompression bonding roller 1a is
Even when a cold (room temperature) foam coated with a heat-sensitive adhesive is brought in, the surface temperature of the thermo-compression roller 1a decreases slightly, but the material of the foam F and the heat-sensitive adhesive While supplying sufficient heat to the agent, the middle and discharge side thermocompression rollers 1b, 1
In C, while maintaining the heat obtained by the foam by the thermocompression roller 1a on the carry-in side, it operates so as to apply heat pressure higher than the bonding temperature of the heat-sensitive adhesive to adhere the foam F and discharge it to the stacker. .

As mentioned above, according to this invention, if the conveyance of the foam stops for some reason, two or more pairs of thermocompression rollers are arranged to apply thermocompression so as not to burn the paper that is the material of the foam. Since thermo-compression rollers are dispersed and have different surface temperatures on the loading and unloading sides, the high-temperature thermocompression rollers on the loading side can be set so as not to burn the foam even when the rollers are stopped for at least several minutes. The high-temperature thermocompression bonding rollers perform two roles, pre-warming and adhesion heat retention, for the cold foam that has not yet been warmed, that is, the effect of two conventional rollers. The structure compensates for the lack of adhesion heat retention effect of the pressure roller, so it eliminates wasted heat.
It is possible to easily obtain speeds higher than those obtained with conventional high-temperature rollers, and also to obtain a compact device with stable adhesion.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a thermocompression bonding device for foam according to this invention. 1a is a thermocompression roller on the carry-in side, IC is a thermocompression roller on the output side, 2a, 2b, 2C are heating elements, 3 is a conveyance roller, 4
is a heat insulation board, and F is a foam.

Claims (1)

[Scope of utility model registration request] For forms constructed by arranging two or more pairs of thermocompression rollers, each consisting of a metal roller equipped with a heating element, each consisting of a pair of two rollers that sandwich and convey the stacked forms with a heat-sensitive adhesive applied to a predetermined pressure point. A thermocompression bonding device for foams, in which the surface temperature of a thermocompression roller on a foam carry-in side is set higher than the surface temperature of a thermocompression roller on a foam carry-out side.