JPH0379264B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flavoring packaging bag made of thermoplastic resin. More specifically, a fragranced packaging bag made of a thermoplastic resin is characterized in that at least a portion of the packaging bag is formed of a film or sheet made of a mixture of a fragrance-containing flexible resin and a thermoplastic resin. The present invention relates to flavored packaging bags.

In general, thermoplastic resins have water resistance, heat resistance, chemical resistance (acid resistance, alkali resistance, organic solvent resistance, etc.), gas permeability, corrosion resistance, insect damage resistance, flexibility, heat sealability, It has various excellent properties such as processability, and is widely used as a variety of packaging materials such as food packaging, vegetable and fruit packaging, clothing packaging, drug packaging, machinery and appliance packaging, electrical appliance packaging, various containers, fertilizer bags, etc. .

In particular, polyolefin resins such as polyethylene and polypropylene are used as general-purpose resins for extrusion of films, sheets, tapes, pipes, etc. because they are inexpensive, have the above-mentioned excellent properties, and are easy to process. It is processed into molded products or injection molded products such as containers, and is used in many fields such as food manufacturing, agriculture, architecture, and electricity. In particular, since low-density polyethylene films have excellent optical properties such as transparency and gloss, most of low-density polyethylene is used for films. In addition, nearly 90% of the film is used for packaging, and is used as packaging or packaging bags.

These films or packaging bags are generally colorless, transparent, tasteless, odorless, and non-toxic.
Depending on the purpose, application, form of use, etc., (1) adding additives such as coloring agents, chemicals, fillers, etc. such as pigments, rust preventives, antifungal agents, and fragrances; (2) applying printing; 3) We are increasing the product value by adding various functionalities to packaging materials, such as by devising shapes and structures.

One of the products that has improved its product value is scented packaging bags.

Conventional flavoring packaging bags can be roughly divided into those made of paper and those made of thermoplastic resin. Paper flavoring packaging bags not only absorb fragrance significantly, but also significantly increase costs. It has shortcomings such as short-lasting fragrance, poor water resistance, and the inability to see through the contents. On the other hand, among aromatic packaging bags made of thermoplastic resin,
When making bags using films made by directly kneading fragrances into thermoplastic resins, for example, the most widely used polyethylene and polypropylene are incompatible with highly volatile liquid fragrances and sublimable solid fragrances with low melting points. Since they are soluble and cannot be impregnated sufficiently, the fragrance content is low and the fragrance has a very short duration. Additionally, there are drawbacks such as dissipation of fragrance during molding and severe deterioration of quality.

The present invention has been made as a result of extensive studies to solve the above problems. That is, the present invention provides a flavoring packaging bag made of a thermoplastic resin, in which at least a portion of the packaging bag is formed of a film or sheet made of a mixture of a fragrance-containing flexible resin and a thermoplastic resin. It's about bags.

Soft resins that are compatible with fragrances can be sufficiently impregnated with fragrances, but on the other hand, it is difficult for the fragrances to desorb and volatilize from the resin surface, making it impossible to produce a sufficient fragrance. Furthermore, it is generally difficult to form a film. On the other hand, when a fragrance-containing soft resin is melt-mixed with a thermoplastic resin that is incompatible with fragrances but compatible with soft resins, aromatic properties are exhibited, and the strength and persistence of the fragrance can be controlled. The present invention was completed based on the knowledge that the process can be controlled and film forming properties are also improved.

The soft resin used in the present invention includes:
Petroleum resins, unvulcanized rubber, polybutene, polyvinyl chloride resins, carboxyl group-containing ethylene copolymers, etc. Carboxyl group-containing ethylene copolymers such as ) are preferred in that they have very good compatibility with fragrances and thermoplastic resins described below. Particularly preferred is ethylene-vinyl acetate copolymer.

On the other hand, thermoplastic resins include high, medium, and low density ethylene homopolymers, ethylene-propylene copolymers, ethylene-butene-1 copolymers,
Ethylene-hexene-1 copolymer, ethylene-4
- α containing ethylene as the main component, such as methylpentene-1 copolymer, ethylene-octene-1 copolymer, etc.
- Copolymers with olefins, polypropylene, copolymers with other α-olefins containing propylene as a main component, polyolefin resins such as polybutene-1, poly-4-methylpentene-1, and malein thereof. These include polyamide resins such as nylon-6, nylon-6,6, and nylon-12, polyvinyl alcohol resins, polyester resins, saponified products of ethylene-vinyl acetate copolymers, and mixtures thereof. A resin having high crystallinity and good processability such as film forming property is used. Among these resins, polyolefin resins are preferred because they are versatile, inexpensive, and have good processability.

In addition, there are natural fragrances and artificial fragrances, and natural fragrances include animal fragrances such as musk, civet, castor, and ambergris, lavender oil, and honey. oil, lemon oil, orange oil,
There are botanical fragrances made from plant essential oils such as rose oil, camphor oil, sandalwood oil, and cypress oil.

Artificial fragrances include synthetic fragrances made of terpene compounds or aromatic compounds, isolated fragrances whose components are separated from essential oils mainly through fractional distillation, and various other isolated fragrances, synthetic fragrances, and natural fragrances. Examples include blended fragrances prepared by mixing them to be suitable for practical use, and at least one of these is used.

The content of the above-mentioned fragrance may be determined according to the purpose, use, etc. and the type of soft resin and thermoplastic resin. For example, when the flexible resin is ethylene-vinyl acetate copolymer (EVA),
The content of fragrance is approximately proportional to the vinyl acetate (VA) content of EVA, and if the VA content is 30% by weight, approximately 30% by weight of fragrance can be impregnated.
However, the strength of the fragrance increases with the amount of fragrance contained, but about 0.01 to 1% by weight is sufficient in the final product, so when diluting the fragrance impregnated EVA to 10 to 100 times the amount, It is sufficient to impregnate EVA with about 1 to 10% by weight of fragrance.

On the other hand, the persistence of the fragrance depends on the VA content and the mixing ratio of the fragrance-containing flexible resin and the thermoplastic resin. For example, according to experiments conducted by the present inventors, EVA (VA15
If low density polyethylene is used as the thermoplastic resin and diluted to 1 to 10 times the amount (% by weight), the fragrance will last approximately 0.5 to 1 year, and if diluted to 10 to 100 times the amount The fragrance lasts for about 0.1 to 0.5 years. The persistence of these fragrances also depends on the type of fragrance,
The type of soft resin, the content of carboxyl groups,
It varies depending on the type of thermoplastic resin, etc., but the purpose,
It is selected as appropriate depending on the purpose and the like.

The resin mixture composition used in the present invention includes:
There is no problem in adding commonly used additives such as fillers such as talc, calcium carbonate, clay, silica, alumina, wood flour, and paper chips, pigments, ultraviolet absorbers, antioxidants, and plasticizers. In addition, the method of mixing a fragrance-containing soft resin with another thermoplastic resin containing a filler in advance involves directly mixing the soft resin, thermoplastic resin, filler, and fragrance, melting,
Compared to the molding method, absorption of fragrance into the filler is much less and it is more efficient.

The blender or mixer used in the present invention may be a conventional one, such as a Henschel mixer,
A Dalton mixer, kneader, Banbury mixer, hot roll mill, or extruder can be used.

The incense packaging bag of the present invention is suitable for packaging bags such as portable tissue paper bags, wet towel bags, cleaning bags, packaging bags for incense tools used at ceremonial occasions, medicines, cosmetics, costume bags, etc. Flavored packaging bags that aim to impart a desirable aroma, or food packaging bags such as sweet bread packaging bags, candy packaging bags, fruit packaging bags, etc., are designed to enhance the favorable aroma of the contents and improve appetite. A scented packaging bag that appeals to people, or a garbage bag for storing household garbage, etc.
Examples include perfumed packaging bags for transporting dirty clothes, packaging bags for storing waste, and perfumed packaging bags for the purpose of deodorizing the contents, and they are used depending on the purpose, use, etc. Furthermore, there are no particular limitations on the type of packaging, such as for light packaging or heavy packaging. In particular, for light packaging such as bags for portable tissue paper,
The fragrance transfers to the paper during use and remains as a scent.
Product value can be significantly improved.

The above-mentioned flavored packaging bag may be made entirely of a fragrance-containing film, but it is also possible to form only one side or a desired part of the bag with a fragrance-containing film, or to form a different desired part with a different kind of fragrance-containing film. Alternatively, it is also possible to use the same or different types of fragrance-containing films on the inner and/or outer surfaces of the bag, or to form a flavored packaging bag consisting of two or three layers of film including a barrier film.

For example, by a multilayer inflation method using a multilayer die: Low density polyethylene (LDPE)/LDPE containing a fragrance-containing flexible resin; LDPE/barrier film (nylon) containing a fragrance-containing flexible resin; Fragrance (A) A film or sheet consisting of LDPE containing a soft resin containing fragrance/barrier film (nylon)/LDPE containing a soft resin containing fragrance (B); or LDPE containing a soft resin containing fragrance/LDPE/barrier film; etc. Bags are made into inner and outer layers as appropriate.

The film or sheet may be formed by a conventional method such as an inflation method or a T-die method, and is not particularly limited.

As mentioned above, the flavoring packaging bag of the present invention has various uses and forms, and has the following characteristics.

(1) It is possible to provide a flavored packaging bag containing a high concentration of fragrance; (2) it is possible to control the intensity and persistence of the fragrance; (3) it is possible to provide a fragrance packaging bag that contains fragrance at a high concentration; Almost no deterioration occurs; (4) There is little volatilization or dissipation of the fragrance during processing, so there is almost no loss, and the fragrance can be effectively contained, making it very economical; (5) There is no loss of fragrance during processing; It has good processability; and (6) the fragrance-containing flexible resin and thermoplastic resin can be directly kneaded and molded in an extruder. It can be significantly improved.

The present invention will be further explained below with reference to Examples.

Example 1 Ethylene-vinyl acetate copolymer (EVA, manufactured by Nippon Petrochemical Co., Ltd., trade name: Nisseki Rexron)
When the pellets of V270) were impregnated with a rose-based blended fragrance, 17% by weight was impregnated. 20 parts by weight of these fragrance-containing EVA pellets were added to low-density polyethylene (LDPE, manufactured by Nippon Petrochemical Co., Ltd., product name:
After mixing with 80 parts by weight of Nisseki Rexron F331EE) pellets, the mixture was fed to a blown film manufacturing machine to obtain a film with a thickness of 15 μm (fragrance concentration of approx. 3
%). When I used the film to wrap a portable tissue paper and later used the tissue paper, I found that the rose scent was transferred to the tissue paper, and when I blew my nose, I felt a slight aroma and felt refreshed. It was hot. The fragrance of this packaging bag lasted for about 3 months or more.

Comparative Example 1 When the LDPE pellets used in Example 1 were impregnated with the same rose-based blended fragrance as in Example 1,
Only about 3% by weight was impregnated. Contains this fragrance
The LDPE pellets were fed into a blown film manufacturing machine to prepare a film with a thickness of 15 μm (flavor concentration approximately 3%). When a portable tissue paper was wrapped in the film, the rose scent was transferred to the tissue paper, but the fragrance in the packaging bag only lasted about one month.

Comparative Example 2 The EVA pellets used in Example 1 were impregnated with about 3% by weight of a rose-based blended fragrance, and then fed to a blown film manufacturing machine. Inflation bubbles are extremely unstable and it was difficult to form a film, but
Finally, a film with a thickness of 15 μm was obtained. This film had significant blocking and could not be opened to package portable tissue paper.
Therefore, when I wrapped a portable tissue paper with this film without opening it, I found that although the fragrance of the film lasted for more than 4 months, the fragrance did not transfer to the tissue paper very much, and the fragrance was insufficient. showed that.

Example 2 Fragrance-containing EVA obtained by impregnating the EVA used in Example 1 with 20% by weight of a commercially available lemon-based blended fragrance
After mixing 20 parts by weight of the pellets and 80 parts by weight of the LDPE pellets used in Example 1, the mixed pellets were fed to the first extruder.

On the other hand, only the LDPE pellets used in Example 1 were supplied to the second extruder, passed through a circular die for forming a blown film, and extruded to the semicircumference of the circular die by the first extruder. The remaining half circumference was extruded using a second extruder to produce an inflation tube. When this tube was used to make a packaging bag, one side of which was a regular film and the other side a fragranced film, the fragrance of the packaging bag lasted for more than 3 months.

Claims (1)

[Claims] 1. A flavoring packaging bag made of thermoplastic resin,
A scented packaging bag, wherein at least a portion of the packaging bag is formed of a film or sheet made of a mixture of a fragrance-containing flexible resin and a thermoplastic resin. 2. The perfumed packaging bag according to claim 1, wherein the flexible resin is a carboxyl group-containing ethylene copolymer. 3. The flavoring packaging bag according to claim 2, wherein the carboxyl group-containing ethylene copolymer is an ethylene-vinyl acetate copolymer. 4. The perfumed packaging bag according to any one of claims 1 to 3, wherein the thermoplastic resin is a polyolefin resin. 5. The polyolefin resin is at least one resin selected from the group of polyethylene homopolymers, polypropylene homopolymers, copolymers containing ethylene or propylene as a main component with other α-olefins, or mixtures thereof. The fragrance packaging bag according to claim 4. 6. The perfumed packaging bag according to any one of claims 1 to 5, wherein the perfumed packaging bag is a portable tissue paper packaging bag.