JPS5947991B2 - Peelable packaging film - Google Patents

Description

[Detailed description of the invention] The present invention relates to a packaging film with excellent peelability.

Specifically, the present invention relates to regenerated cellulose, polyolefin,
By applying a release coating agent consisting of a solution or emulsion consisting mainly of an inorganic lubricant with an average particle size of 1μ or more, wax, and a heat-sealing agent to both sides or one side of a base film made of polyester, polyamide, etc. The present invention relates to a packaging film that has excellent releasability from packages and has heat-sealing properties. Up until now, overpacks for gastella, manjiyu, pork buns, and other bread confectionery have been mainly made of regenerated cellulose, polyolefin film, and resins or emulsions that have heat-sealing properties on both or one side to prevent blocking and improve slipperiness. After wrapping with a film coated with a solution supplementary with about 1 to 5 parts by weight of waxes, waxes, and inorganic lubricants, packaging was completed by heat sealing.

However, when the packaging film is peeled off (removed) to take out the packaged item after packaging, the surface layer of the packaged item adheres to the film and is removed as is, seriously damaging the appearance of the packaged item. At the same time, this leads to a reduction in the weight of the packaged items. There was a problem. The base film used in the present invention includes unstretched films of regenerated cellulose, polyolefin, polyester, polyamide, etc., uniaxially stretched films, o-biaxially stretched films, and the like.

The release coating agent used in the present invention includes an inorganic lubricant with an average particle size of 1 μ or more: 5 to 20 parts by weight, preferably 10 to 20 parts by weight, and a wax: 10 to 65 parts by weight, preferably 20 to 20 parts by weight.
The liquid mainly contains 40 parts by weight, heat-sealable additive; 30 to 70 parts by weight, preferably 40 to 70 parts by weight.

The release coating agent can be applied either in the form of an emulsion or in the form of a solution dissolved (dispersed) in a solvent.

Examples of the inorganic lubricant used in the release coating agent include silicon dioxide, clay, and fine synthetic resin powder.The average particle size is preferably 1μ or more, but 3μ or more is suitable.
A value of μ or more is desirable.

As the wax used for the release coating agent, any known wax can be used.

That is, paraffin, carnauba wax, montan wax, beeswax, synthetic wax, etc. can be mentioned.

Further, as the heat-sealing agent, a publicly known one can be used.

Namely, vinyl chloride copolymer resin, vinylidene chloride copolymer resin, acrylic copolymer resin, ethylene-vinyl acetate copolymer resin, chlorinated polypropylene resin,
Examples include chlorinated polyethylene resin. Among these, vinyl chloride/nylidene copolymer resins are effective in terms of their excellent oxygen gas barrier properties, water vapor barrier properties, oil resistance, etc. The usage amount of each component is limited for the following reason. That is, with regard to lubricants and waxes, if the use range is less than the limited range, the releasability will be poor, and if the range is exceeded, the heat sealability will be degraded. If the heat-sealability imparting agent is less than a certain range, the heat-sealability will be insufficient, and if it exceeds that range, the amount of lubricant and wax will decrease, resulting in a decrease in releasability. The release coating agent in the present invention needs to be applied to the surface that will come into contact with the packaged object.

However, there is no problem in applying it to both sides. Furthermore, it is extremely effective in terms of packaging suitability to apply a release coating agent to a surface that has been previously coated with a solution or emulsion containing the synthetic resin having heat-sealing properties.

When applying a release coating agent in an emulsion state, if repelling occurs, a surfactant can be added to improve the wettability of the surface to be coated. Additionally, additives such as ultraviolet absorbers and antistatic agents can also be added. As a coating method in the present invention, coating apparatuses such as a dip coater, a roll coater, a gravure roll coater, a reverse roll coater, an air knife coater, and a Meyer bar coater can be used.

The coating thickness of the release coating agent is preferably smaller than the average particle size of the inorganic lubricant in terms of releasability. O. lμ
It is sufficient to apply the above amount.

Next, examples will be shown, but these are only for explaining the present invention and are not intended to limit the invention, of course. Examples 1 to 3 After applying a coating liquid mainly consisting of vinylidene chloride-acrylic acid ester copolymer emulsion (vinylidene chloride content: 85% by weight) to both sides of a biaxially stretched polypropylene film (thickness: 20μ), The release coating agent (formulation A) shown in Table 1 was applied to one side of the coated surface using a Meyer bar coater.

The coated film was dried in the open at 110° C. for 30 seconds. Weight increase due to application of release coat agent after drying (Release coat agent application amount is 0.3 to 1.5V)
/? It was 71'. Using the obtained coated film,
Immediately after production, the roll gastella was overpackaged so that the surface coated with the release coating agent was in contact with the gastella. After being left at room temperature (20 to 25° C.) for a day and night after packaging, the upper packaging was opened, the Rollgastella was taken out, and it was examined whether the surface portion of the Rollgastella was transferred to the coated film.

The results are shown in Table-1. Comparative Examples 1 to 5 in Table 1 are the same as Examples 1 to 5 except for the release coat agent formulation and application amount.
I did the same as step 3.

Example 4 The following release coating agent (formulation F) was coated on both sides of a biaxially stretched polyester film (thickness: 16 μm) using a dip method.

The coated film was dried in an oven at 110°C for 20 seconds. The amount of release coat agent applied after drying is 1.5
It was V/d. Using the obtained coated film, the ``man buns'' immediately after production were overpackaged so that the surface coated with the release coat agent was in contact with the ``man buns''.

After packaging, leave it at room temperature (20-25°C) for a day and night, then unwrap the upper packaging, take out the manjiyu, and check whether the surface part of the "manjiyu" has been transferred to the release coating agent coated film. The results are shown in Table-2.

Prescription F The above recipe was dissolved and dispersed in toluene-ritetrahydrofuran (1:1) so that the solid content was 20%.

Claims (1)

[Claims] 1. An inorganic lubricant with an average particle size of 1 μ or more in the base film;
A removable packaging film coated with a release coating agent consisting of a solution or emulsion mainly containing 5 to 20 parts by weight, wax; 10 to 65 parts by weight, and heat-sealability filler; 30 to 70 parts by weight. .