JPH06102003B2 - Filter rod manufacturing equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a filter rod manufacturing apparatus for continuously manufacturing a cigarette filter.

[Conventional technology]

Conventionally, as the filter rod manufacturing apparatus of this type, the apparatus having the structure shown in FIGS. 4 to 6 has been considered.

This conventional structure has a coating tape 1, for example, a width of 27 mm, and an application portion 3 for applying a milky glue 2, for example, a thermoplastic polyvinyl acetate glue or an ethylene vinyl acetate glue to the edges of a covering tape 1 to form an adhesive portion. The paper tape comprises a winding portion 5 into which a tow-shaped filter material 4 made of cellulose acetate is compressed and molded into a rod shape, and a heating portion 6 for heating the above-mentioned adhesive portion of the covering tape 1.

Then, the flexible transfer tape 7 is circulated along the passage 9 on the bed 8 and the coating tape 1 on which the adhesive portion is formed by applying the milky paste 2 on the transfer tape 7 is applied on the transfer tape 7. The tow-shaped filter material 4 on the covering tape 1 and the transfer tape 7 on the winding part 5.
The guide tape 1 is gradually wound up by this guide, the cover tape 1 is wound up by the transfer tape 7 and the filter material 4 is wrapped by the cover tape 1 while being compression-molded into a rod shape, and the edges of the cover tape 1 have the milky paste 2 interposed therebetween. The edges are overlapped with each other, and the adhesive portion, which is an edge overlapped portion, is heated by a heating portion 6 equipped with an electric heater. By this heating, the milky paste 2 is dried and solidified, and the edges of the covering tape 1 are adhered to each other, so that the filter material 4 is covered with the tape. A filter rod 10 having a diameter of about 8 mm, which is wrapped by 1 is continuously produced.

By the way, in the case of the above-mentioned conventional structure using the milky paste 2, the filter material 4 is wound by the covering tape 1 while being compression-molded. There was a possibility that it would occur.

For this reason, there is a limit in increasing the winding feed speed due to the initial adhesive strength, which is the adhesive strength at the time of bonding, and for example, the winding feed speed is limited to about 200 m / min.

Therefore, a hot-melt adhesive (hot melt) is used as an adhesive that replaces the milky paste 2, and high-speed winding, for example, 400 m / min
A filter rod manufacturing apparatus that enables a winding speed of 10 is put into practical use.

[Problems to be Solved by the Invention]

However, although this hot-melt adhesive is more suitable for high-speed production than an apparatus using a milk paste, it is much more expensive than a milk paste, and it is apt to deteriorate due to aging, and peeling of an adhesive portion due to deterioration may occur. Have inconvenience.

[Means for Solving the Problems]

The present invention is intended to solve these disadvantages, and the gist thereof is to apply a thermoplastic adhesive to a coating tape to form an adhesive portion, and to wind a filter material with the coating tape. A winding unit and a heating unit for heating the adhesive portion of the covering tape; and a preheating unit for preheating the covering tape between the applying unit and the winding unit, and the heating unit. The filter rod manufacturing apparatus is characterized in that a cooling unit for cooling the bonded portion is provided subsequent to the above.

[Action]

The coating tape is preheated by the preheating section, the thermoplastic adhesive applied on the coating tape by the coating section is heated before entering the winding section, and the filter material is wound by the coating tape at the winding section. The adhesive portion of the covering tape is heated by the heating unit, and the adhesive portion is cooled by the cooling unit.

〔Example〕

1 to 3 show an embodiment of the present invention, FIGS. 1 and 2 show the first embodiment, and FIG. 3 shows the second embodiment.

Incidentally, the same reference numerals are given to the same mode parts as those of the conventional structure shown in FIGS. 4 to 6 and explained.

Reference numeral 11 denotes a preheating unit, which includes an electric heater and a heating plate that contacts the outer surface of the coating tape 1, that is, the surface opposite to the surface to which the milky paste is applied.

Reference numeral 12 is a cooling unit, which has a structure for circulating cooling water.

Since the first embodiment has the above-described structure, the outer surface of the covering tape 1 is heated by the preheating unit 11, and the milky paste 2 (for example, polyvinyl acetate paste) on the covering tape 1 applied by the applying unit 3 is heated. This preheating induces evaporation of water and solvent in the milky paste 2 to improve the quick-drying property, and the preheating section 6 is provided on the cross section of the covering tape 1 as shown in FIG.
On the outer surface side of the side, a hardened layer a is formed by the milky paste 2 that has penetrated into the covering tape 1 to prevent the milky paste 2 from protruding to the back surface, and the transfer tape 7 and the winding portion 5 due to the adhesion of the milky paste 2 , The heating section 6, the cooling section 12 and the like can be prevented in advance, and then the heating section 6 heats the adhesive portion, and the heating causes the milky paste 2 to be dried and solidified. By cooling, this cooling cools the vinyl base, which is the component of the milky paste 2, and the vinyl base has the property of solidifying by cooling, which accelerates the curing and increases the initial adhesive force, thus making the filter rod continuously higher in speed. Can be manufactured.

In this case, it is possible to manufacture at a high winding speed of 400 m / min, and it is conceivable to increase the winding speed by lengthening the heating part 6 without providing the cooling part 12, but with the above-mentioned properties of vinyl-based materials. Even if the length is slightly increased, the winding speed does not increase, and the length of the device becomes considerably long. However, the presence of the cooling unit 12 can make the device compact.

In addition, by heating only the nozzle portion other than the glue tank in the coating unit 3 to raise the temperature of the milky paste 2 at the time of discharging, it is possible to perform higher speed winding.

The second embodiment of FIG. 3 shows another structure, in which the heating part 6 is composed of a pre-heating part 6a and a post-heating part 6b, and the whole covering tape 1 is heated while being wound by the pre-heating part 6a. After that, the post-heating portion 6b is configured to heat the adhesive portion of the covering tape 1 after being wound.

The second embodiment also obtains the same effect as the first embodiment.

〔The invention's effect〕

In the present invention, as described above, the outer surface of the coating tape is heated by the preheating unit, the thermoplastic adhesive applied on the coating tape by the applying unit is heated, and the preheating heats the moisture in the thermoplastic adhesive. The evaporation of the solvent is invited to improve the quick-drying property, and a hardened layer of the thermoplastic adhesive that has penetrated into the coating tape is formed on the outer surface side of the preheating part of the coating tape, and the thermoplastic adhesive is squeezed out to the back surface. Is prevented, and the malfunction of each part of the device due to the adhesion of the thermoplastic adhesive can be prevented in advance, and then the heating portion heats the adhesive portion, the heating causes the thermoplastic adhesive to dry and solidify, and the adhesive portion is cooled by the cooling portion. Upon cooling, this cooling accelerates the hardening of the thermoplastic adhesive and increases the initial adhesive strength, which allows the filter rod to be manufactured continuously and at a higher speed.

As described above, the intended purpose can be sufficiently achieved.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is an explanatory side view of the first embodiment, FIG. 2 is a sectional state view of the covering tape, and FIG. 3 is an explanatory side view of the second embodiment. FIG. 4 is a side view for explaining the conventional structure, FIG. 5 is a partial perspective view thereof, and FIG. 6 is a partial lateral view thereof. 1 ... Covering tape, 3 ... Coating part, 4 ... Filter material, 5 ...
Entrainment part, 6 ... Heating part, 11 ... Preheating part, 12 ... Cooling part.

Claims (1)

[Claims] 1. A coating part for applying a thermoplastic adhesive to a covering tape to form a bonding part, a winding part for winding a filter material with the covering tape, and heating for heating the bonding part of the covering tape. A heating section for preheating the coating tape between the coating section and the winding section, and a cooling section for cooling the bonded portion subsequent to the heating section. A filter rod manufacturing apparatus characterized in that