JPS58131055A - Method of manufacturing bag from package - 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 making a package, and more specifically, to a microporous membrane or nonwoven fabric made of plastic (A) and 1A).
A laminated layer M (B) consisting of a thin film of plastics having a softening point lower than that of (3) and a thin film M (Y) of plastics having a softening point higher than that of (3),
Make the (3) side 11K inside and overlap it with (4).

When sealing the periphery and making bags, (A) 50 of l, ze
The temperature of the heating bar or heating port is set to a temperature at which (A) does not soften, and the temperature of the heating bar or heating roll on the (B) side is set to a temperature that is higher than the softening point of (3). y
This invention relates to a method for making bags for packaging bodies, characterized in that the bags are made at a temperature lower than the softening point of .

In recent years, there has been an increasing amount of research and development into thin films such as microporous plastic membranes and plastic nonwoven fabrics. Since these four membranes have high air permeability similar to paper, they can be used as packaging materials for two-carbon desiccants, air fresheners, and the like. However, since these thin films are made of polyolefins such as polyethylene or polyglopylene, if a normal packaging machine that uses heat and pressure bonding is used, the microporous film or nonwoven fabric will be fused to the heatper or heat roll. It is impossible to heat seal, and impulse sealer [2r.

A special printer had to be used.

Moreover, when such a special sealer is used, it is impossible to perform high-speed filling and packaging as in the past, resulting in a significant decrease in efficiency.

The present invention overcomes these drawbacks and relates to a bag making method that enables high-speed filling and packaging when a microporous plastic membrane or nonwoven fabric is used as a part of the packaging bag.

In the present invention, the microporous membrane is generally referred to as a microporous film. The microporous film used in the present invention usually has fine pores and has a Gurley set air permeability of o, oi to 1α000sec/100-
and preferably 1 to 1° [1D 0see/10
0- and does not allow water to pass through at normal pressure. The size of the micropores is generally 0.01 to 50 microns, preferably 2 microns or less.

In order to produce the microporous membrane used in the present invention, for example, cold stretching of a synthetic resin film such as polyethylene/polypropylene, borifuffed ethylene resin, stretching of a film containing foreign matter, stretching of a film containing foreign matter, etc. Methods such as extraction of foreign matter, stretching the film after extracting foreign matter from the film containing s#l, or irradiation of the film with electron beams are employed.

Examples of microporous membranes suitably used in the present invention include Duragard (Celanese M, USA), FP-2 (Kyoto Kasei), N0P (Nippon Petrochemical), Nidoflon NTF (
(manufactured by Nitto Electric Industries), NF sheet (manufactured by Tokuyama Soda), Cellboa NWOI (manufactured by Fountain Katei), Boertex (manufactured by Bohr, USA), and Boliflonheher (manufactured by Daikin Industries).

In the present invention, the nonwoven fabric is a nonwoven fabric made of polyolefin, polyamide such as nylon, polyester, etc., and the air permeability is Gurley's air permeability Z>! Q, 01-1
0.000sec/ 100- to center 9, preferably 1-
It swells at 1.000 see/100- and does not allow water to pass under 5 pressures. Specifically, Tyvek (manufactured by DuPont, USA), Reθmay (manufactured by Yubon Co., Ltd., USA), Spunbond, Iyer (manufactured by Layer Kasei), Acstar (manufactured by Toshi), etc. are preferable.

In the present invention, a thin film (3) of plastic having a softening point lower than that of Thin membranes such as films or sheets made from ionomers are used. This thin film is made of PE and EVA.
A laminate of two or more types of films such as PE and polyethylene ionomer may also be used. The thin fa (X) made of these plastics is appropriately selected in relation to the material of (A).

In addition, in the present invention, the thin JII (Y) of plastics having a softening point higher than the softening point of (1) is a film or sheet of plastics having a softening point higher than the softening point of (1) by 10C or more, preferably by 20C or more. A thin film such as (■) is used, and specifically, a thin film such as polyethylene terephthalate (PET), nylon, polypropylene/Fil A, or a sheet is used.

The combination of (a) and (■) is appropriately selected depending on the properties of (3) or (Y), but preferably PET and EVA.

PET and PE, nylon and PE or nylon and EVA
It is a combination of etc.

In the present invention, a thin film (B
) is a method of fusing or gluing (g) and (Y),
Alternatively, it can be manufactured as appropriate by a method of press-bonding or a method of applying (3) to (7). In addition, when adhering the flash and (Y), a heated molten liquid such as polyethylene is poured between the film flash and the film (Y).

Manufacturing by cooling and laminating is also an OT capability.

In the present invention, the thickness of (A) is generally 1.
It is 0 to 500μ, preferably 50 to 509μ. The thickness of (B) is generally 20 to 2 CI Oμ, preferably 50 to 100μ.

In the manufacturing method of the present invention, in order to heat-seal (A) and (B) without melting or softening (A), a heating bar or heating roll on the (A) side is used in a four-way knoll type high-speed automatic filling machine. Holding the temperature of (4) below the softening point of (B)
It is characterized by bag making while controlling the temperature of the mill's heating bar or heating roll to a temperature higher than the softening point of (3) and lower than the softening point of ('l), and the present invention According to the method, high-speed automatic bag making using a microporous plastic membrane or nonwoven fabric is possible.

For example, the nonwoven fabric of (A) is made of bolyethylene, and (3)
When is ethylene vinyl acetate copolymer (EVA) and (2) is nylon, the heating roll temperature on the (4) side is 70 to 13
0C1(Y)1m heating roll temperature is 90-180C
If set to , preferred bag making is possible.

The package obtained by the method of the present invention is particularly suitable for use as an oxygen absorber package, but can also be used as a desiccant,
It can also be used as a packaging for fragrances, heating elements, etc.

In particular, when the package obtained using the method of the present invention is used as an oxygen absorber, it has excellent water resistance, so even if it comes into direct contact with food that has a high moisture content and has a wet surface, the oxygen absorber can be used as an oxygen absorber. It does not cause stains on the skin and can be used suitably.

Example 1 EVA was extruded and laminated on a PET film (thickness 15μ) to make a 50μ thick laminated laminate film, and this EVA layer and a microporous polyethylene film (Cellpore:
Bags were made using a four-sided seal type high-speed automatic packaging dVC so that the bags were in contact with Sekisui Chemical (150 μm thick) bags. At this time, set the heat roll on the microporous membrane side to 11 degrees to 80 to 100C.
Set the temperature of the heat roll on the side where the film becomes lighter to 110-1
After controlling each 30CK and heat sealing, the four-sided seal was extremely well sealed! I was able to dive t2.

Example 2 Melted polyethylene (thickness 15μ) was placed between PET film (thickness 15μ) and EVA film (thickness 35μ).
! A laminated film was made by pouring and cooling using IK, and bags were made using a four-sided seal type high-speed automatic packaging machine so that this EVA layer and a polyethylene-only nonwoven fabric (Thailand Bag: DUPONTtj, 'Jsa20o7z) were in contact with each other. . At this time, set the temperature of the heat roll on the nonwoven fabric side to 90 to 110C.
When heat sealing was performed by controlling the 11 degrees of the heat roll on the side in contact with the KPIT film from 120 to 140 cK, it was possible to obtain a four-sided sealed bag that was sealed extremely well.

Patent applicant: Mitsubishi Gas Chemical Co., Ltd. Representative Kazuyoshi Nagano 275-

Claims (1)

[Claims] Microporous plastic membrane or nonwoven fabric (A), (
A laminated film (B) consisting of a thin film of plastics (3) having a softening point lower than the softening point of A), and a thin film M (η) of plastics having a softening point higher than the softening point of
Place the (X) side inward and overlap it with (A), making the periphery 7
-C, when making bags, set the temperature of the heating par or heating roll of (A) II to a temperature that does not soften (A), and adjust the temperature of the heating par or heating roll of (B) m (3). J1111! by sealing at a temperature higher than the softening point of (1) and lower than the softening point of (1)! A method for manufacturing a package, characterized by: