JP2978161B1 - Envelope - Google Patents

Abstract

An object of the present invention is to provide a recyclable envelope having excellent buffering properties and waterproofness and being recyclable. SOLUTION: An adhesive is used in combination at an opening edge 4 of an envelope in which the adhesive strength of heat welding is not sufficiently obtained, and the front and back paper sheets 1,
2 by heat-sealing the bubble sheet 3 directly to secure the close contact between the paper sheets 1 and 2 and the bubble sheet 3 at the opening edge 4 and each of the side edges 5 and 6, thereby providing excellent cushioning and waterproofness. In addition, the plastic bubble sheet 3 provided after use of the envelope and the paper sheets 1 and 2 can be easily separated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an envelope having a cushioning property and a waterproof property.

[0002]

2. Description of the Related Art As an envelope having a cushioning property and a waterproof property, a sheet (hereinafter referred to as a bubble sheet) formed by sealing air in a cell shape between plastic films is used as a paper sheet. The lining used on the inner surface of is used. In this type of envelope, the edges other than the opening edge are completely sealed, and the enclosed article can be smoothly inserted between the two bubble sheets.
It is required that the bubble sheet at the opening edge be in close contact with the paper sheet.

As an envelope satisfying the above requirements, there is an envelope disclosed in Japanese Utility Model Publication No. 64-1241, which is widely used. This envelope is formed by laminating a plastic film on the entire surface of the paper sheet, and further stacking the bubble sheet on the sheet body, with the bubble sheet surfaces facing each other, and overlapping the entire length of the open edge other than the edge that becomes the opening edge of the envelope, The bubble sheet is heat-sealed and hermetically sealed, and the bubble sheet at the edge serving as the opening edge is heat-welded to a paper sheet laminated with a plastic film.

[0004] The reason why the plastic film is laminated on the paper sheet is to secure the adhesion between the bubble sheet and the paper sheet during heat welding. That is, the edges other than the opening edge, two bubble sheets, and each bubble sheet and the laminate film are heat-sealed and completely sealed, and at the opening edge each bubble sheet and the laminate film are heat-welded, The paper sheet and the bubble sheet are adhered smoothly.

On the other hand, in recent years, in order to prevent environmental pollution due to waste treatment, there is an active movement to recycle waste. Although the above-mentioned envelope has extremely excellent cushioning and waterproof properties, when discarded after use, the paper-quality sheet and the bubble sheet are firmly adhered to each other via the laminate film, so that the paper-quality part and the plastic part are separated. There is a problem that it cannot be separated and cannot be recycled.

An object of the present invention is to provide a recyclable envelope having excellent buffering and waterproof properties.

[0007]

In order to solve the above-mentioned problems, an envelope according to the present invention is provided between an opposing paper sheet.
Bubble sheet superimposed on two interposed on the entire surface, the opening edge entire length of overlap other than the edge portion serving as the opening edge of the envelope, is thermally welded to said bubble sheet between Rutotomoni, each paper quality sheet
The sheet and the bubble sheet are also heat- sealed and sealed, and an adhesive is interposed between each of the paper sheets at the opening edge and the bubble sheet, and each of the paper sheets along the entire length of the opening edge. And the bubble sheet was heat welded.

That is, the bubble sheet can be separated from the paper sheet by laminating the bubble sheet directly to the paper sheet by heat welding without laminating the plastic film on the paper sheet, and the paper section and the plastic section are individually recycled. It was made possible.

In order to ensure the adhesion between the paper sheet and the bubble sheet without using a laminate film, the present inventors have conducted intensive tests and adopted the above-described configuration based on the following findings.

[0010] At open edges other than the edge that becomes the opening edge of the envelope, the opposing paper-quality sheets are pressed by the heat-pressing bar from both sides with the two stacked bubble sheets interposed, and the bubble sheet is pressed. Are thermally welded. At this time, the two bubble sheets are welded to each other, and the melted bubble sheet is hardly uneven on the surface of the paper sheet, and the bubble sheet is joined to the paper sheet by an anchor effect. For the edges other than the envelope opening edge, by setting the temperature at the time of heat welding to be slightly higher, the fluidity of the melted bubble sheet is increased, the penetration into the irregularities is promoted, and a sufficient anchoring effect is secured. I confirmed that I can do it.

A bakelite plate is inserted into the opening edge of the envelope, which is an opening edge of the envelope, in order to prevent welding of the bubble sheets, and the edges of the paper sheet and the bubble sheet on both sides of the bakelite plate are heated. It is pressed against the bakelite plate by the pressure bar, and the bubble sheet is thermally welded. In this case, the bubble sheet comes in direct contact with the bakelite plate, and heat during heat welding is transmitted through the bakelite plate and escapes. The fluidity of the sheet cannot be sufficiently increased. In order to supplement the anchor effect of the melted bubble sheet, it was confirmed that sufficient adhesiveness could be secured by interposing an adhesive between the paper sheet and the bubble sheet in order to supplement the anchor effect of the melted bubble sheet. did.

Further, the opposing paper-quality sheet and the double-bubble bubble sheet are each formed by folding in two, and the two folded edges are the same edges other than the edge which becomes the opening edge of the envelope. By arranging the parts on top of each other,
The heat welding at the folded edge can be omitted.

[0013] Further, the paper sheet and the bubble sheet are formed of a continuous long sheet having an edge portion serving as an opening edge of an envelope as a width end, and a bubble sheet other than the edge portion serving as the opening edge is provided.
Heat-sealed each other , and
In addition, by forming a sealed edge by heat-sealing between the sheets, and cutting it after this heat-sealing, the envelope can be manufactured efficiently in a continuous line, and the sealed edges of adjacent envelopes can be simultaneously heated. Since welding can be performed, the number of times of thermal welding can be greatly reduced.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. This envelope is shown in FIG.
(A) and (b), as shown in FIG.
The two bubble sheets 3 are sandwiched on the entire surface between the paper sheet 2 and the back side paper sheet 2, and the edges 5 at both width ends and the bottom edge 6 of the envelope excluding the upper opening edge 4 are thermally welded to the bubble sheet 3. The bubble sheet 3 is hermetically sealed to the front paper sheet 1 and the back paper sheet 2 at the opening edge 4. Note that a folded portion 7 is provided on the upper side of the front sheet quality sheet 1, and the folded portion 7 has a double-sided adhesive tape 8 for closing the mouth.
And a cover tape 9 covering the double-sided adhesive tape 8.

At the opening edge 4, as shown in FIG. 2 in an enlarged manner, a hot melt adhesive 10 containing a thermoplastic resin as a main component is interposed between each bubble sheet 3 and the paper sheets 1 and 2. The adhesion between the bubble sheet 3 and the paper sheets 1 and 2 is enhanced. In addition, the opening edge 4 is used for the bubble sheet 3.
Are thinned by heat welding, and are formed in a smooth shape so that the encapsulated article is not caught.

As shown in FIG. 3, the bubble sheet 3 is formed of a three-layer low-density polyethylene film.
Air is sealed in a cell shape between the intermediate film having irregularities and one of the cover films. It is also possible to use a two-layer bubble sheet without one cover film.

As shown in FIG. 4, this envelope has a long paper sheet 11 for the front paper sheet 1, a long paper sheet 12 for the back paper sheet 2, and two long bubble sheets 1
By using No. 3 as a material, it is possible to efficiently manufacture a continuous line. This line is used for manufacturing an envelope by taking two envelopes. Each of the long paper sheets 11 and 12 wound in a coil shape is supplied from above and below, and two long bubble sheets similarly wound in a coil shape. 13 is supplied between the long paper sheets 11 and 12 while being folded in two from both sides.

As shown in FIG. 5, each of the long paper sheets 1
A pair of upper and lower nozzles 1 are provided on both sides of the entry side where the long bubble sheet 13 is folded over the folded bubble sheets 1 and 12.
The hot melt adhesive 10 is sprayed on a portion that becomes the opening edge 4 of the envelope. Further, the long paper sheet 11 for the front-side paper quality sheet 1 is formed to be wide by the width of the folded portion 7, and a double-sided adhesive tape 8 and a cover tape 9 are attached to both ends of the wide paper in advance.

On the downstream side of the place where the long paper sheets 11 and 12 and the long bubble sheet 13 are overlapped, a long part which becomes the opening edge 4 of the envelope and a part which becomes the bottom edge 6 are provided. A pair of upper and lower thermocompression bars 15 and 16 for heat-sealing the bubble sheet 13 are arranged, and further downstream thereof, a long bubble sheet 13 that is to be the edge 5 at both width ends of the envelope is provided. A thermocompression bonding bar 17 for heat welding is arranged.

As shown in FIG. 6, a bakelite plate 18 is inserted between the two folded long bubble sheets 13 at the position where the thermocompression bonding bar 15 for heat-welding the opening edge 4 is formed. The upper and lower long bubble sheets 13 are not welded to each other when the portion to be the edge 4 is thermally welded.

The long paper sheets 11 and 12 and the long bubble sheet 13 are intermittently sent out at a stroke corresponding to the width of the envelope, and the heat-pressing bars 15, 16 and 17 are simultaneously operated, and The part is thermally welded. Although not shown, a slitter that divides the welded and integrated long sheet into two sections at the center of the welded width and a shear that cuts the sheet into the width of the envelope are installed downstream of the heat welding section. Envelopes are manufactured continuously.

Although the embodiment shown in FIGS. 4 to 6 uses two envelopes, this continuous line can be easily changed to a single-row arrangement. Further, instead of supplying the long bubble sheet by folding it from both sides, the long bubble sheet can be supplied by being overlapped on the long paper sheet from above and below.

FIGS. 7A and 7B show another embodiment. In this envelope, a front and back paper sheet 19 and a bubble sheet 20 to be lined are formed by folding at the bottom of the envelope.
In this case, heat welding at the bottom edge of the envelope is omitted. The rest is the same as the embodiment shown in FIGS. 1 (a) and 1 (b). In this embodiment, the edge of the envelope bottom is folded in two, but one edge of the width end may be folded in two.

In the above-described embodiment, a hot-melt adhesive is used as an adhesive for reinforcing the thermal welding of the bubble sheet at the opening edge of the envelope. However, other adhesives such as a rubber-based adhesive can also be widely used. .

[0025]

As described above, according to the envelope of the present invention, the bubble sheet is directly adhered to the paper sheet by heat welding without laminating the plastic film on the paper sheet. Can be separated from the paper sheet, and the paper section and the plastic section can be separately recycled. In addition, since the adhesive is used together at the opening edge of the envelope where the adhesive strength of heat welding is not sufficiently obtained, the adhesiveness between the paper quality sheet and the bubble sheet at each edge can be ensured, and excellent cushioning and waterproofness can be achieved. A provided envelope can be provided. In addition, paper sheets and bubble sheets
An edge which is formed by a continuous long sheet having an edge serving as an opening edge of an envelope as a width end, and a bubble sheet other than the edge serving as an opening edge of the envelope is heat-sealed and sealed, after this heat welding. By cutting and forming, the envelope can be efficiently manufactured in a continuous line, and the sealing edges of adjacent envelopes can be simultaneously heat-sealed, so that the number of times of heat-sealing can be greatly reduced.

[Brief description of the drawings]

FIG. 1A is an external perspective view showing an embodiment of an envelope, and FIG.
Partially omitted vertical sectional view of

FIG. 2 is an enlarged longitudinal sectional view of a main part of FIG. 1;

FIG. 3 is an external perspective view of a bubble sheet used for the envelope of FIG. 1;

FIG. 4 is a perspective view schematically showing a line for manufacturing the envelope of FIG. 1;

FIG. 5 is an enlarged perspective view of a main part of FIG. 4;

FIG. 6 is an enlarged sectional view taken along the line VI-VI of FIG. 5;

FIG. 7A is an external perspective view showing an envelope of another embodiment, and FIG.
Is a partially omitted vertical sectional view of a.

DESCRIPTION OF SYMBOLS 1, 2 Paper quality sheet 3 Bubble sheet 4 Opening edge 5, 6 Edge 7 Folded portion 8 Double-sided adhesive tape 9 Cover tape 10 Adhesive 11, 12 Long paper sheet 13 Long bubble sheet 14 Nozzle 15, 16, 17 Thermocompression bonding bar 18 Bakelite board 19 Paper sheet 20 Bubble sheet

Claims (3)

(57) [Claims] 1. A two-layer plastic bubble sheet is interposed between the opposing paper-like sheets on the entire surface, and the total length of the overlapping open edge other than the edge that becomes the opening edge of the envelope is defined as:
The Rutotomoni bubble sheet together by thermal welding, wherein each of
The paper material sheet and the bubble sheet are also heat- sealed and sealed, and an adhesive is interposed between each of the paper material sheets at the edge serving as the opening edge and the bubble sheet. And an envelope where the bubble sheet is heat-sealed. 2. The facing paper-like sheet and the double-bubble bubble sheet are each formed by folding in two, and the folded edges of both are the same edges other than the edge that becomes the opening edge of the envelope. The envelope according to claim 1, wherein the envelope is arranged so as to overlap the part. 3. The paper sheet and the bubble sheet are formed of a continuous long sheet having an edge portion serving as an opening edge of an envelope as a width end, and bubble sheets other than the edge portion serving as an opening edge are provided. > And heat-welding the paper sheet and the bubble sheet.
The envelope according to claim 1 or 2, wherein the edges sealed by heat welding between the sheets are formed by cutting after the heat welding.