JPS608051A - Backlining sealing method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for obtaining a bag with a good appearance by folding a flat film into a cylindrical shape and pasting and sealing the bag on the back.

BACKGROUND ART Conventionally, so-called rocket packaging has been used, which is a plastic film bag filled with ham, sausage, side dishes, etc., and the opening at one or both ends of the bag is tied with a clip such as an aluminum wire. The plastic film bag used in this rocket package is usually manufactured by folding a flat film into a cylindrical shape around a homer plate made of a flat metal plate, and then pasting and sealing the bag on the back.

As shown in the perspective view of the bag shown in Figure 1, the back sticker is usually a so-called gassho sticker, in which the ends of the same side of the film that have been folded by the homer plate face each other to form the back sticker part 2 and are sealed. ing.

However, the rocket package with the above-described gassho seal has a disadvantage of poor appearance and reduced commercial value.

The present invention is a so-called envelope seal in which film edges are overlapped vertically in parallel and sealed as a spine part 2 as shown in FIG. 1, and it is possible to easily and reliably obtain a bag with a good appearance. We have found a way to do this.

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

FIG. 2 is a side view showing an example of an apparatus for carrying out the method of the present invention, and FIG. 3 is an enlarged sectional view taken along the line 1--2.

In the present invention, a flat synthetic resin film (including a slightly thicker sheet) is bent into a cylindrical shape by a homer plate 3 having a width approximately equal to the fold diameter of the final bag. On the top of this homer plate 3 is the film back sticker! A band-shaped elastic body 10 is fixed in parallel with the above with an adhesive or the like. The purpose of this elastic body io is to prevent heat from the sealer (to be described later) from being directly transferred to the homer plate 3, and the material is preferably one that has excellent heat insulation properties and surface smoothness, such as silicone rubber, etc. can be suitably used.

Above the cylindrical film / which has been bent into a cylindrical shape by the homer plate 3 , a heat-resistant belt is installed on a pulley / / which is rotated by a drive device such as a motor. The purpose of this heat-resistant belt 2 is to prevent fusion between the sealer 7 and the cylindrical film, which will be described later. The material for the heat-resistant belt is preferably one having heat resistance and appropriate surface smoothness, and a belt made of glass cloth coated with fluororesin or the like can be suitably used. Since the cylindrical film is held between the above-mentioned band-shaped elastic body 10 and the heat-resistant belt, the cylindrical film can be moved reliably without the sealed portion shifting. The rotational speed of the heat-resistant belt roller should be the same as the final bag production speed.

-g are provided consecutively. The sealer 7 and the cooler O are pushed down by a spring r and press against the backing part 2 of the cylindrical film. It is also possible to use an air cylinder or the like instead of the spring r. The suppression pressure may be determined as appropriate depending on the material, thickness, etc. of the film. Similarly, 3- The heating temperature of the sealer ≠ by the heater j and the cooling temperature of the cooler ≠ can also be determined as appropriate.

The operation of the sealer 7 and the cooler O can be such that they are always pressed downward by the spring g etc. while the heat-resistant belt is rotating, but the rotation of the heat-resistant belt is an intermittent operation, and the sealer 7 and the cooler O can be operated in conjunction with this movement and pushed down each time the belt stops. It is also possible to repeat the operation of returning upward after sealing is completed.

The cylindrical film 1, which has been back-attached and sealed by the sealer 7 and whose back-attached portion 2 has been cooled by the cooler t, is sent out to the rear by nip rolls (not shown), and further cut into appropriate dimensions by a rotary cutter or the like and sent to the next process. .

Next, the present invention will be explained by examples.

Example: As a flat film, ethylene-vinyl acetate copolymerized °
3-layer composite film consisting of body/polyamide resin/ethylene-vinyl acetate copolymer (thickness: tioμ, width: 320mm)
rrm) was used.

4- Width of the above film/! A band-shaped elastic body io made of silicone rubber is bent into a cylindrical shape using an oboro homer plate 3, and then a backing part 2 is attached to the upper surface of the homer plate 3.
While being held at a rotational speed of 2 o m 7 minutes by a heat-resistant belt 7 made of glass cloth coated with fluorine resin and having a thickness of 2@n, a length of 200 m, and a width of 20 wn, Heat sealing was carried out under the conditions of a sealing temperature of 3 tOC1 and a presser load of 7309 -. Next, the cooler 6 connected to the seal part 7
Presser load at (width - 5′, length ioo), 2 s O
Cooling was performed at a cooling temperature of 2jC.

The spine-attached portion of the cylindrical film l obtained by the above method has a beautiful appearance as an envelope seal, and the seal strength of the heat-sealed spine-attached portion is aOOg-//! The body width (pulling speed so■/min, g!'Q) and strength were sufficient for practical use.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a bag envelope-sealed according to the present invention. Second
The figure is a side view showing an example of an apparatus for carrying out the method of the present invention, FIG. 3 is an enlarged sectional view taken along the line 1--2 of FIG. 1, and FIG. /...Tubular film λ...Back sticker 3...Homer plate 7...Sealper 2...Heat-resistant bell) 10.・・・・・・
Elastic body 7- Figure 2 Akira 4

Claims (1)

[Claims] In the method of bending a flat film into a cylindrical shape with a homer plate (3), overlapping the ends and sealing the spine with a seal bar, the ends of the film are overlapped vertically parallel to each other and the spine is pasted (2). ), and the back pasting part (2
) is held between a band-shaped elastic body (10) provided on the upper surface of the lower homer plate (3) and a heat-resistant belt (9) rotating in the upper film transport direction, and pressed with a seal bar (7). A spine pasting sealing method characterized by heat sealing.