JP3486367B2 - Glue seam adhesive for smoking articles for smoking articles - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive agent for a cigarette (cigarette and cigar) wrapping paper used as a cut wrap portion of a smoking article.

[0002]

2. Description of the Related Art A cigarette is manufactured by cutting paper used as a cut wrap portion, wrapping a dry cigarette in the wrap portion to form a cylindrical shape, and adhering a seam of the wrap portion with an adhesive. Further, in the case of a cigarette with a filter, the filter is formed and the filter and the wrap portion are adhered to each other. A cigarette is about 2000-1 per minute
Manufactured using high speed machines capable of producing 4000 lines. The adhesive is applied by spraying from a nozzle onto the lap portion, or by applying it to the side surface of the disk (disc) and then transferring it onto the lap portion. In order to cope with the production by such a high speed machine, an adhesive having a high solid content and a low viscosity is required so that it can be easily applied to the lap portion and the drying time can be shortened.

Conventionally, as adhesives for seams of cigarette paper, vinyl acetate resin emulsion, ethylene-vinyl acetate copolymer resin emulsion (EVA emulsion),
A carboxymethylcellulose paste (CMC paste) and the like are known.

The EVA emulsion is produced by dissolving a protective colloid such as polyvinyl alcohol (PVA) in water, adding vinyl acetate for emulsification, and emulsion copolymerizing with ethylene. Such an emulsion type adhesive is suitable for high-speed production of cigarettes because the viscosity can be easily adjusted. However, cigarettes made with EVA emulsion have a different taste tendency than cigarettes made with CMC paste.

On the other hand, the CMC paste is not suitable for the high-speed production of cigarettes because the CMC paste has a higher viscosity than the EVA emulsion, but the CMC paste is used in the conventional medium-low speed production method. The trend was to design each brand of cigarette.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide an adhesive for a seam of lap wrap portions, which is suitable for high-speed production of cigarettes and gives a taste similar to that of CMC paste.

[0007]

The adhesive for seam wrap seams of smoking articles according to the present invention comprises an ethylene-vinyl acetate copolymer.
Carboxymethyl cellulose for 100 parts by weight of the resin mixture
1-10 parts by weight and polyvinyl alcohol 1-1
It is characterized by containing 0 parts by weight.

[0008]

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION To produce the adhesive of the present invention,
For example, ethylene and vinyl acetate are emulsion-copolymerized in an aqueous solution containing carboxymethyl cellulose (CMC) and polyvinyl alcohol (PVA) as protective colloids. CMC and PVA are adsorbed on ethylene-vinyl acetate copolymer resin (EVA) as a protective colloid.

In the CMC / PVA protective colloid EVA emulsion type adhesive thus obtained, the solid content in water is preferably 35 to 60%, more preferably 45 to 55%, and the viscosity is 200 to 900 mPa · s. And more preferably 300 to 600 mPa · s.

When the solid content is less than 35%, the drying property is poor and the initial adhesiveness is poor, making high-speed production difficult. On the other hand, when the solid content is higher than 60%, the viscosity becomes high. Also, the viscosity is 20
If it is lower than 0 mPa · s, the adhesive may penetrate into the paper too quickly and the adhesive strength may not be sufficiently exhibited. On the other hand, when the viscosity is higher than 900 mPa · s, the amount of adhesive applied at the nozzle or the like becomes unstable and high-speed production is difficult.

In the present invention, 1 to 10 parts by weight of CMC, preferably 2 to 4 parts by weight, and 1 to 10 parts by weight of PVA are preferably contained with respect to 100 parts by weight of the ethylene-vinyl acetate copolymer resin. Parts, more preferably 2 to 6 parts by weight. If the CMC content is less than 1 part by weight, the taste will not be close to that of the CMC paste. On the other hand, when the content of CMC is more than 10 parts by weight, polymerization stability and initial adhesiveness are poor. If the PVA content is less than 1 part by weight, the polymerization stability will be poor. On the other hand, when the content of PVA is more than 10 parts by weight, the viscosity becomes high and the taste is CM.
It is not close to C paste.

With respect to CMC, it is preferable that the average degree of etherification is 0.6 to 1.5, further 0.8 to 1.0, and the average degree of polymerization is 50 to 1500, further 50 to 100.

If the average degree of etherification of CMC is lower than 0.6, the taste will not be close to that of the CMC paste, and the stability over time after mixing will be poor. On the other hand, when the degree of etherification of CMC is higher than 1.5, the taste is not close to that of CMC paste. When the average degree of polymerization of CMC is lower than 50, the taste is C
It is not close to MC paste. On the other hand, when the degree of polymerization of CMC is higher than 1500, the polymerization stability is lowered and the viscosity is increased, so that the taste is not close to that of the CMC paste.

Regarding PVA, the average degree of saponification is 80 mol% or more, more preferably 85 to 96 mol%, and the average degree of polymerization is 20.
It is preferably 0 to 2500. If the saponification degree of PVA is lower than 80 mol%, the taste will not be close to that of the CMC paste. If the degree of saponification of PVA is higher than 96 mol%, the ability of protective colloid is insufficient and the polymerization stability is lowered, and the viscosity stability of the obtained emulsion at low temperature is also poor. If the average degree of polymerization of PVA is lower than 200, the taste will not be close to that of the CMC paste. On the other hand, the average degree of polymerization of PVA is 2500
If it is higher, the viscosity is higher, the workability is lowered, and the taste is C
It is not close to MC paste.

[0016]

EXAMPLES Examples of the present invention will be described below.

(Example 1) 1750 g of water was put into a 5 L pressure resistant reactor equipped with a reaction temperature controller and a stirrer, and 89 g of polyvinyl alcohol (66 g of PVA205, PVA2).
23 g of 17 (all manufactured by Kuraray Co., Ltd.) and 114 g of carboxymethyl cellulose (manufactured by Daicel, CMC Daicel 1205) were dissolved. Next, 760 g of vinyl acetate was added to this solution to emulsify, and the temperature was raised to 70 ° C. At this time, vinyl acetate is emulsified with a protective colloid of PVA and CMC.

After replacing the atmosphere in the reactor with ethylene, ethylene was added to the reactor so that the pressure in the reactor was 18 kg / c.
It was in m ^2. Next, polymerization was initiated by supplying a 4% aqueous sodium persulfate solution, which is a polymerization initiator, while keeping the temperature inside the reactor constant at 70 ° C. The polymerization time was 6 hours, and 168 mL of a 4% sodium persulfate aqueous solution was continuously supplied within the polymerization time. Also, after the initiation of polymerization, ethylene was added to adjust the pressure to 30 kg / cm ² , and vinyl acetate 11
40 g was continuously fed into the reactor over 4 hours. After 6 hours from the initiation of the polymerization, the polymerization was terminated when the unreacted amount of vinyl acetate became 1% or less, followed by cooling, and the unreacted ethylene was removed under reduced pressure. Vinyl acetate 1900g
165g of ethylene reacts with 2065g of EV
A was generated.

Thereafter, the temperature was raised to 40 ° C., and 19 g of a 4.9% hydrogen peroxide / 5.7% t-butyl hydroperoxide aqueous solution and 17 g of a 15.6% tartaric acid aqueous solution were introduced into the reactor at a constant temperature. It was continuously added over 1 hour. Then, it cooled and adjusted pH to around 5 with 25% ammonia water.

The resulting emulsion had a solid content of 53.
The viscosity was 6%, the viscosity was 2280 mPa · s, the pH was 5.3, and the glass transition temperature of the polymer was 8 ° C. Water is added to this emulsion to give a solid content of 51% and a viscosity of 450 mPas.
-Adjusted to s and used as an adhesive for seams.

(Example 2) The CMC used in Example 1 was replaced with CMC Daicel 1105 (manufactured by Daicel) and emulsion polymerization was carried out in the same manner. The obtained emulsion had a solid content of 53.2%, a viscosity of 1950 mPa · s, a pH of 5.2, and a polymer glass transition temperature of 8 ° C. Water was added to this emulsion to adjust the solid content to 51% and the viscosity to 450 mPa · s, and this was used as an adhesive for seams.

(Example 3) 1900 g of the water of Example 1
Then, emulsion polymerization was similarly performed using 178 g of polyvinyl alcohol. The obtained emulsion has a solid content of 52.
The viscosity was 2%, the viscosity was 3650 mPa · s, the pH was 5.2, and the glass transition temperature of the polymer was 8 ° C. Water is added to this emulsion to give a solid content of 47% and a viscosity of 450 mPas.
-Adjusted to s and used as an adhesive for seams.

(Comparative Example 1) EVA emulsion type adhesive A made in Japan was prepared. This emulsion has a solid content of 5
The viscosity is 5%, the viscosity is 1500 mPa · s, the pH is 4.5, and the glass transition temperature (Tg) of the polymer is 0 ° C. Add water to this emulsion to give a solid content of 51% and a viscosity of 450
It was adjusted to mPa · s and used as an adhesive for seams.

Comparative Example 2 Commercially available CMC (CMC Daicel 1105, manufactured by Daicel Chemical Industries, Ltd.) was dissolved in water 7
% CMC aqueous solution (CMC paste) was used as an adhesive for seams.

Obtained CMC / PVA protective colloid EV
The initial adhesion, productivity and taste of the A emulsion (Example) and the conventional CMC paste and EVA emulsion were evaluated. The results are shown in Table 1 below.

The evaluation method is as follows. (1) Solid content concentration of emulsion According to JIS K6828 (however, dried at 105 ° C. for 3 hours). (2) Emulsion viscosity According to JIS K6828 (BM viscometer, 30 revolutions,
(Measured at 30 ° C). (3) Initial adhesiveness The initial adhesiveness was measured under the following conditions using a slot coating type adhesive strength measuring machine. Adhesive coating amount: approx. 20 g / m ²
(Wet), adherend: coated paper (manufactured by Japan Tobacco Co., Ltd.), press time: 2 seconds, oven time: 10 seconds, T peel test. (4) High-speed productivity Tobacco maker (MMC4000) was used to evaluate mechanical suitability. (5) Taste A sensory test was conducted on flavor and smoke amount with a panel (blender) specialized for taste.

[0027]

[Table 1]

The taste is designed with the CMC paste, but the productivity is inferior when the CMC paste is used. Specifically, if the solid content is increased, the viscosity becomes high and the workability is significantly reduced, so the solid content must be reduced.
However, when the solid content is reduced, the drying property is poor and the initial adhesiveness is also poor.

On the other hand, the emulsion type adhesive has a low viscosity and high workability even if the solid content is increased, and at the same time, good initial adhesiveness and high-speed productivity can be obtained. However, conventional E
When the protective colloid is only PVA as in the VA emulsion, the taste tendency is different from that of the CMC paste. On the other hand, the CMC / PVA protective colloid EVA of the example
The emulsion not only has good productivity but also has a taste tendency similar to that of the CMC paste.

[0030]

As described above in detail, according to the present invention, it is possible to provide an adhesive for seam of lap wrap portion, which is suitable for high-speed production of tobacco and gives a taste similar to that of CMC paste.

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) A24C 5/24 C09J 101/26 C09J 131/04

Claims (3)

(57) [Claims] 1. An ethylene-vinyl acetate copolymer resin 100.
Carboxymethyl cellulose 1 to 10 parts by weight
Parts by weight and 1 to 10 parts by weight of polyvinyl alcohol.
A lap seam for smoking articles characterized by having
Adhesive. 2. The carboxymethyl cellulose is flat
Uniform etherification degree is 0.6 to 1.5, average polymerization degree is 50 to
The smoking article according to claim 1, wherein the smoking article is 1500.
Adhesive for seam of lap wraps of products. 3. The polyvinyl alcohol has an average polymerization.
Degree is 200 to 2500, average saponification degree is 80 mol% or more
The smoking article according to claim 1 or 2, characterized in that
Adhesive for seam of lap wraps of products.