JPH0648448A - Envelope and sealing thereof - Google Patents

Abstract

PURPOSE:To provide an envelope and sealing method thereof, the manufacture of which is easy, and which can be continuously sealed at a high speed by an assured and even adhering force even when being put on a sealing machine by using a heat-sensitive adhesive. CONSTITUTION:A tongue piece for sealing 12 is extended from one end opening 11 of an envelope main body 1. A heat-sensitive adhesive layer 2 is formed on the whole surface or partially of at least one surface of the tongue piece 12 or a surface to be sealed 13. Also, when the envelope is sealed, the above- mentioned tongue piece 12 is bent and put on the top of the surface to be sealed 13, and then the put together tongue piece 12 and the surface to be sealed 13 are press-bonded while being heated to adhere the tongue piece 12 and the surface to be sealed 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an envelope and a method for sealing the envelope.

[0002]

2. Description of the Related Art Conventionally used envelopes are made of an arabic rubber aqueous solution or the like on the sealing tongue piece or the surface to be sealed, which is extended from one end opening of the envelope body for convenience of sealing. A glue layer is formed. In this type of envelope sealing method, the Arabic paste is moistened with water to restore its activity as an adhesive to the Arabic paste, and the tongue piece and the sealed surface are polymerized and then dried to obtain the Arabic paste. The water was gradually evaporated to seal the adhesive.

[0003]

However, in the above-mentioned envelope and its sealing method, the Arabic paste formed on the envelope is poor in stability over time, deteriorates after about three months, and then becomes wet with water. Because it will not adhere even if you let it,
Since the adhesiveness is not very reliable, and the amount of water required to restore the activity as an adhesive is subtle, the adhesive strength is greatly affected by the amount of water. Therefore, it is not reliable whether or not the envelope is sealed with a reliable and uniform adhesive force, and it takes time to evaporate the moisture of the damp Arabic paste. It was unsuitable for the purpose of continuously sealing with a sealing machine.

Further, in the production of the above-mentioned envelope, in order to form an arabic glue layer, it is necessary to dry the water content after applying an aqueous solution of arabic rubber, which is an emulsion, so that it takes a long time to produce and long drying is required. Equipment was required and production was complicated.

Therefore, the present invention solves the above-mentioned problems of the prior art, is easy to manufacture, and is capable of continuously and rapidly sealing with a reliable and uniform adhesive force even when applied to a sealing machine, and a sealing method thereof. Is intended to be provided.

[0006]

In order to achieve the above object, the present invention has the following configuration. That is, in the envelope according to the present invention, a sealing tongue is extended from one end opening of the envelope body, and a thermosensitive adhesive layer is entirely or partially formed on at least one of the tongue and the sealed surface. It is characterized by that.

Further, the method for sealing an envelope according to the present invention is
The tongue for sealing is extended from one end opening of the envelope body, and the tongue of the envelope is formed by forming a thermosensitive adhesive layer on the whole or a part of at least one of the tongue and the surface to be sealed. It is characterized in that the tongue piece and the sealed surface are adhered to each other by bending and superposing on the surface, and then pressing the polymerized tongue piece and the sealed surface under pressure.

[0008]

In the envelope of the present invention, the thermosensitive adhesive layer is formed on the entire surface or a part of at least one of the sealing tongue and the sealed surface extending from the one end opening of the envelope body, and the envelope is sealed. In addition, the tongue piece of the envelope is bent and polymerized on the sealed surface, and then the polymerized tongue piece and the sealed surface are heated to soften or melt the adhesive layer. If the tongue piece and the sealed surface are pressure-welded and then the adhesive layer is solidified by cooling, the tongue piece and the sealed surface are adhesively sealed.

Further, in forming the heat-sensitive adhesive layer in the production of the envelope of the present invention, unlike the emulsion, the heat-sensitive adhesive is 100% solid so that the drying step is unnecessary and the open time is short, so that it can be easily performed in a short time. Can be formed.

Further, since the heat-sensitive adhesive used in the envelope of the present invention is excellent in stability over time, the adhesiveness does not deteriorate in a short period of time, and the adhesive is softened or heated by heating. Since it is a heat-sensitive type that is melted to activate the adhesiveness as an adhesive, it does not become sticky at room temperature, and even if the envelopes of the present invention are stacked, adjacent envelopes do not stick to each other, and dust adheres to the adhesive layer. It does not get dirty.

Furthermore, since the time-consuming step of moistening with water or drying is not required to seal the envelope of the present invention, it is possible to continuously and reliably seal the envelope with a reliable and uniform adhesive force even when applied to a sealing machine. .

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes an envelope body, and the envelope body 1 is made of paper, a synthetic resin sheet such as polypropylene or polyethylene, or a film, and the type thereof is not particularly limited. It is preferably used because it has excellent heat resistance. Further, the shape of the envelope body 1 is not particularly limited, and may be any conventionally known square-shaped rectangular shape, long shape, western shape, or a different shape. One end of the envelope body 1 is an opening 11,
An enclosed item such as a postal item is inserted into the envelope body 1.

Reference numeral 12 denotes a sealing tongue extending from the opening 11 at one end of the envelope body 1. The tongue 12 is bent toward the back surface of the envelope body 1 so that the upper portion of the back surface of the envelope body 1, that is, It is designed to be superposed on the sealed surface 13.

At least one of the tongue piece 12 and the sealed surface 13 has a thermosensitive adhesive layer 2 formed on the whole surface or a part thereof. That is, it may be formed on the tongue piece 12 as shown in FIG. 1, or may be formed on the sealed surface 13 on which the tongue piece 12 is superposed as shown in FIG. 2, or as shown in FIG.
And the sealed surface 13 may be formed. Although FIGS. 1 to 3 exemplify the elongated envelope body 1, the adhesive layer 2 may be appropriately formed on the envelope body 1 having a rectangular shape, a Western shape, an irregular shape or the like. Further, the adhesive layer 2 may be formed on the entire surface of the tongue piece 12 or the sealed surface 13, or the tongue piece may not be easily peeled off when the tongue piece 12 and the sealed surface 13 are bonded. 12 or the sealed surface 13 may be partially formed. Further, the adhesive layer 2 may be formed continuously or may be intermittent,
Further, the shape may be linear as shown in FIGS. 1 to 3, three shapes as shown in FIG. 4A, mountain shapes as shown in FIG.
It may be formed in a curved shape or a pattern, such as an oblique stripe shape as in (C), a dot shape as in (D), or may be formed in a shape along the shape of the tongue piece 12, It is not particularly limited.

If the heat-sensitive adhesive used in the present invention is softened or melted when heated, and the adherends are pressure-welded in this state, and then cooled to be solidified and adhered, The type is not particularly limited, but in general, those containing polyamide, polyurethane, polyester, ethylene vinyl acetate copolymer, or olefin as a main component are used.

When used for an application such as direct mail, the envelope has a softening temperature of about 70 to 120 ° C.
It is preferable to select a heat-sensitive adhesive having an open time of about 8 to 12 seconds, such as an ethylene vinyl acetate copolymer or a polyurethane adhesive, because the envelope can be continuously sealed at a high speed by a sealing machine or the like.

In order to form the heat-sensitive adhesive layer 2 on the tongue piece 12 and the sealed surface 13, the heat-sensitive adhesive is first heated and melted by a melting device such as a heating tank, and the melted heat-sensitive adhesive is melted. May be applied to the tongue piece 12 and the sealed surface 13 with an application device such as a roller, a spray, a nozzle, or a brush, and then cooled and solidified.

Next, the method of sealing the envelope of the present invention will be described. First, the tongue piece 12 of the envelope of the present invention is bent in the direction of the back surface of the envelope body 1 and is folded and polymerized on the sealed surface 13 on the back surface of the envelope body 1. Next, the polymerized tongue piece 12 and the sealed surface 13 are heated and pressure-welded while softening or melting the heat-sensitive adhesive layer 2, whereby the tongue piece 12 and the sealed surface 13 are adhesively sealed. .

In order to bend and stack the tongue piece 12 on the sealed surface 13, the tongue piece 12 is directly grasped and bent to form the sealed surface 1.
3, the envelope of the present invention is conveyed by a conveying device such as a belt conveyer, and a bending jig adapted to gradually bend the tongue 12 is pressed against the tongue 12. The tongue 12 may be mechanically bent and polymerized.

Further, the polymerized tongue piece 12 and the sealed surface 1
In order to make pressure contact with 3 while heating, the polymerized tongue piece 12 and the sealed surface 13 may be intermittently sandwiched by using a heat press or the like, or by the heat pressure contact device 3 as shown in FIG. It may be performed continuously. The heating / pressing device 3 shown in FIG. 5 presses the tongue piece 12 and the sealed surface 13 that have been bent and polymerized as described above, and presses a pair of rollers, endless belts, and the like, which are provided as a pair of upper and lower parts to convey the envelope. 31 and a heating device 32 such as a sheathed heater that heats and softens or melts the heat-sensitive adhesive layer 2 formed on the envelope.

That is, when the envelope of the present invention in which the tongue piece 12 is bent and superposed on the sealed surface 13 by the bending jig or the like is inserted into the heating pressure welding device 3 after the enclosed material is inserted, the heating device is heated. The heat-sensitive adhesive layer 2 is heated and softened or melted by 32, and the tongue piece 12 and the sealed surface 13 that have been bent and polymerized are conveyed while being pressure-contacted by the pressure-contacting device 31, and then naturally cooled to heat-sensitive adhesive type. The adhesive layer 2 is solidified, and the tongue piece 12 and the sealed surface 13 are bonded and sealed.

The present inventor conducted a test of continuously sealing the envelope of the present invention using the heating and pressure welding device 3 and confirmed that the envelope of the present invention and the method of sealing the same can continuously seal at high speed as follows. did. That is, using a heat-sensitive adhesive having a softening point of 76 ° C., an open time of 10 seconds, and a melt viscosity of about 900 cps at 180 ° C. and containing ethylene vinyl acetate copolymer as a main component, about 0.07 g is applied to the sealing tongue piece 12. Long envelope 3 made of paper on which the heat-sensitive adhesive layer 2 having the weight of
An envelope of the present invention made of No. (width 120 mm, height 235 mm) was produced.

Then, the tongue piece 12 of the envelope is bent and polymerized on the sealed surface 13 and then inserted into the heating and pressure welding device 3 shown in FIG.
Pressure welding device 3 with ² kg / cm ² and span length of 250 mm 3
Although it was conveyed at a speed of 60 m / min while being pressed with No. 1, the tongue piece 12 and the sealed surface 13 could be adhesively sealed without any practical problems.

[0025]

As described above, in the envelope of the present invention, the tongue piece and the sealed surface are adhesively sealed by the heat-sensitive adhesive layer formed on at least one of the sealing tongue piece and the sealed surface. Therefore, compared with a conventional envelope using Arabic paste, the adhesive layer does not require a drying step, can be easily manufactured in a short time, and the adhesive layer has excellent stability. Therefore, the adhesiveness does not deteriorate in a short period of time, and since it is not sticky at room temperature, even if the envelopes of the present invention are stacked, adjacent envelopes do not stick to each other, and dust adheres to the adhesive layer to stain it. In addition, the object to be encapsulated can be easily inserted, and the envelope of the present invention does not stick to other parts when addressing or printing.

Further, the method for sealing an envelope of the present invention is an envelope wherein the tongue and the sealed surface are adhesively sealed by a heat-sensitive adhesive layer formed on at least one of the sealing tongue and the sealed surface. As compared with the conventional sealing method using an envelope that is adhesively sealed with arabic glue, it does not require time-consuming steps such as moistening with water or drying, so the sealing machine can be downsized and This is a method that allows continuous and high-speed sealing with a reliable and uniform adhesive force using a sealing machine or the like.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of an envelope of the present invention.

FIG. 2 is a front view showing another embodiment of the envelope of the present invention.

FIG. 3 is a front view showing still another embodiment of the envelope of the present invention.

FIG. 4 is a partial front view showing still another embodiment of the envelope of the present invention.

FIG. 5 is an explanatory view showing an embodiment of a heating and pressure welding device for sealing the envelope of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Envelope main body 11 Opening part 12 Tongue piece 13 Enclosed surface 2 Adhesive layer 3 Heating / pressing device 31 Pressing device 32 Heating device

Claims (2)

[Claims] 1. An envelope in which a sealing tongue is extended from one end opening of an envelope body, and a thermosensitive adhesive layer is formed on all or part of at least one of the tongue and the sealed surface. 2. An envelope in which a sealing tongue is extended from one end opening of an envelope body, and a thermosensitive adhesive layer is formed on all or part of at least one of the tongue and the sealed surface. A method for sealing an envelope in which a tongue piece is bent and polymerized on a sealed surface, and then the polymerized tongue piece and the sealed surface are pressed against each other while being heated to bond the tongue piece and the sealed surface.