JPH02256594A - Film for balloon which possesses superior rubber elasticity and expansion thereof - Google Patents

Abstract

PURPOSE:To obtain a balloon which is free from the generation of creases and possesses the superior outside appearance by installing a substrate layer and a sealing layer onto a film and specifying the relation between the thickness of a film, sealing strength, and Young's modulus, and specifying the increase rate of area in the expansion of the balloon. CONSTITUTION:Each film (m), (n) is sealed to a prescribed shape and is used for forming a balloon. In this case, at least one substrate layer is formed in the film (m), (n), and a sealing layer 30 is formed on one or both surfaces of the substrate layer. The relation between the thickness T(cm) of the film (m), (n), sealing strength S(kg/cm<2>), and Young's modulus E(kg/cm<2>) is set so that the equation S/(E.T)>=0.05 is satisfied. Further, when a balloon expansion bag B is formed by charging an original balloon bag A1 with gas, if the area of the standard circle X of the balloon is S1, and the area of the standard circle X2 of the balloon expansion bag is S2 gas is charged with the pressure so that the increase rate (alpha) of the area represented by (S2-S1)/S1 becomes alpha>=0.3.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a balloon film that can be easily expanded and has excellent rubber elasticity, and a balloon inflation method.

(Prior art) General 1. Gas-filled balloons are made by filling a rubber or synthetic resin balloon with H2, He gas, etc. and suspending it in the air with a string attached, or by filling it with N, gas, or air. It is used for advertisements, promotions, decorations, toys, etc. A typical synthetic resin film for balloons is a laminate film made of biaxially oriented polyamide and polyethylene, which are all vapor-deposited.

(Problem to be Solved by the Invention) However, when this balloon film is used to fill He gas, etc. in a balloon travel package that has a gas inlet and is sealed in a circular shape, the seal is sealed in a circular shape. There is a problem in that fold-like wrinkles remain in the seal portion covering the entire peripheral edge portion, spoiling the appearance. Furthermore, even if the balloon is filled with He gas or the like by increasing the gas pressure in order to remove wrinkles over the entire surface of the sealed portion, there is a problem in that the bag may be torn from the sealed portion.

(Means for Solving the Problem) In order to solve the above-mentioned problems, the inventors of the present application have conducted various experiments, and as a result, the present inventors have developed a balloon travel suit having a film structure specified in the present application as disclosed below. The present inventors have discovered that when the balloon is inflated using the inflation method described above, it is possible to eliminate the fold-like wrinkles on the entire surface of the balloon circumferential seal portion, as seen in the conventional example, and have arrived at the present invention. That is, the present invention relates to the structure of a balloon film and a method for inflating balloon travel gear produced using the film. It relates to a film for balloons, which has at least one base material layer and a sealing layer on one or both sides of the base material layer, and has a thickness of Tcm, a roll strength of Skg/am, and a Young's modulus of Ekg/cm'. The relationship is S/(E-T)≧0
．． Further, the invention according to claim 2 of the present application relates to a balloon inflation method, which uses the balloon film according to claim 1 above. The balloon travel suit is sealed in a circular shape, and when the balloon travel suit is filled with gas to form a balloon inflation bag, the balloon travel suit is circularly sealed from the circular center of the circular film constituting the balloon travel suit. The area of the balloon travel standard circle drawn with 1/3 of the radius R1 of the film as the radius is S ls (on the spherical surface of the balloon inflation bag when the balloon inflation bag is formed by filling the balloon travel suit with gas at a pressure of Pg) l/ of the radius R2 of the circle on the spherical surface of the balloon inflation bag from the center of the circle
The area of the balloon inflation bag reference circle drawn with 3 as the radius is S
2. Filling the balloon vehicle with gas at a gas pressure such that the area increase rate α, expressed as (s t−s +)/s, satisfies α≧0.3. This is a characteristic feature.

Hereinafter, the structure of each invention of the present application will be explained in more detail with reference to FIGS. 1 to 6. Unlike the invention described in claim 1, the sealing strength (S kg/ co+), Young's modulus (9kg7cm
The relationship between film thickness (T cm) is S/(E・T
) < 0.05, in order to remove the fold-like wrinkles remaining on the entire surface of the circular peripheral seal portion 30 of the balloon inflation bag B, the balloon inflation bag B is further injected with He gas at a high gas pressure. If an attempt is made to seal such items, the bag will break from the seal portion 30.

In addition, in the invention described in claim 2 of the present application, when forming the balloon inflation bag B by filling gas into the balloon travel gear A, the film of the balloon travel gear A is removed from the film center P of the balloon travel gear A. Area S of balloon travel gear/reference circle X+, where radius r is 1/3 of radius R1, (=πr,
*) When the same balloon travel gear A is once inflated by filling gas to form a balloon inflation bag B, the distance from the center P of the circle on the spherical surface of the balloon inflation bag to the radius R7 of the circle on the spherical surface of the balloon inflation bag is l. The area of the balloon inflation bag reference circle X, with /3 as the radius r, is the area S, (-πr,
S,) and the area S of the balloon travel reference circle It is necessary to seal the gas at a certain pressure. In this case, if gas is filled so that the area increase rate α becomes 70 to 100%, the ellipsoidal shape (in the case of an area increase rate of less than 30%) will swell into a spherical shape like a rubber balloon, which is different from conventional methods. It is possible to create a balloon inflation bag that has a spherical feel, which cannot be achieved with a balloon inflation bag made from a flat film. When the area increase rate α is less than 30%, wrinkles remain in the peripheral seal portion of the seal, resulting in poor appearance (decreased commercial value).

Base material layer (number 11 in Figures 5 and 6) of balloon film (number 11 in Figures 1 to 6)
) are N-6゜N-66, N-
6,66 copolymer, N=6.66.12 copolymer, N-
Polyamide resins such as 6,12 copolymer, saponified ethylene-vinyl acetate copolymer resins with an ethylene content of 25 to 60 mol% and a degree of saponification of 95 mol% or more, polyethylene terephthalate, polybutylene terephthalate, etc. Polypropylene resins such as polyester resins, polypropylene homopolymers, propylene-ethylene copolymers, propylene-ethylene-butene copolymers, vinylidene chloride-vinyl chloride copolymers, vinylidene chloride-acrylonitrile copolymers, vinylidene chloride- Vinylidene chloride resins such as acrylic acid ester copolymers, vinyl chloride resins, polycarbonate resins, etc. are available, and a multilayer structure of two or more layers made of these resins can also be used. On the other hand, the resin used for the sealing layer of the balloon film ffi, n (numerals 12 and 13 in Figures 5 and 6) includes low density polyethylene, very low density polyethylene, linear low density polyethylene, etc. polyethylene resin, ethylene-
Ethylene copolymers such as vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-methacrylate copolymer, ethylene-acrylic acid copolymer, ionomer, polybutene, butene-propylene copolymer, butene- There are polybutene resins such as ethylene-propylene copolymers, and mixtures of two or more of these can also be used.

As mentioned above, the balloon film according to the present invention has the following features:
Film thickness: Tcl111 Seal strength: Skg/c
at, Young's modulus: Ekg/cm" is S/(E-
T)≧0.05, and methods to satisfy this include mixing a plasticizer into the base material layer, or adding water or moisture absorption to the balloon film or balloon travel gear after molding. There are ways to do this.

Further, as the sealing method, there are a fusing sealing method, an impulse sealing method, a hot plate sealing method, etc. Among them, although not particularly limited, the fusing sealing method is favorable in terms of workability. The winter physical properties were measured using the following method.

(1) Seal strength: S (kg/cm) Using Autograph DS, 55000 (manufactured by Shimadzu Corporation), sample width 10 mm, distance between chucks 50 mg
e. Measurements were made under the conditions of a crosshead speed of 505 m/sin, and the breaking strength (kg/co+) of the seal portion was taken as the seal strength.

(2) Young's modulus 'E (kg/cm'') Using the above Autograph DSS5000, sample width 10+@,
Distance between wheels 50mm, crosshead speed 50mm/
A tensile test was conducted under the conditions of 1ll1n, and the tensile modulus (kg/cm"
) was determined and used as Young's modulus.

(3) Area increase rate: α (%) Film center P of balloon travel gear A before filling with gas
, where the radius r is 1/3 of the radius R3 of the balloon clothing film (m, n), the area of the balloon clothing reference circle X+ is πr, and ri is S, and when it is filled with gas and expanded The radius r is 1/3 of the radius R9 of the circle on the spherical surface of the balloon inflation bag from the center P of the circle on the spherical surface of the balloon inflation bag B.
The area increase rate α of the balloon inflation bag reference circle X was calculated using the following formula, where the area (=πr and ri is S).

Area increase rate α=[(St-Sυ/St]X100 (Effect of the invention)) When the balloon expansion bag filled with He gas etc. by the method of the present invention has an area increase rate α of 30% or more, almost no damage occurs in the sealed portion. It has no wrinkles and is beautiful.Especially when the area expansion coefficient α is increased to 70-100%, it becomes spherical like a rubber balloon, making it suitable for decorations and toys and gaining popularity in the industry. The effects are significant.

(Example) The present invention will be explained in more detail with reference to Examples below.

Example 1 Polyamide (PA: N-6,66 copolymer) from the outer layer,
Saponified ethylene-vinyl acetate copolymer (EVOH:
(ethylene content: 38 mol%), adhesive ethylene-vinyl acetate copolymer (APO: vinyl acetate content: 1110w)
t%) and ethylene-vinyl acetate copolymer (EvA: vinyl acetate content: 1110 wt%). It was stretched under the conditions of OX3.0 and stretching temperature of 105℃, and the thickness structure was from the outer layer to (10μ15μ15μ/1
A film for balloons with a diameter of 0μ) was manufactured. This film was melt-cut and sealed into a circular shape, and a blowing port was provided to prepare a balloon travel suit. When this balloon travel gear was immersed in water at 23°C for one week, the water absorption rate was 5.5%, the thickness of the balloon film in this case: Tcm, and the seal strength: S
kg/cm.

The relationship between Young's modulus: Ekg/cm'' was as shown in Table 1.

When this balloon travel bag was filled with He gas and inflated to form a balloon inflation bag, the balloon inflation bag inflated like a rubber balloon without leaving any wrinkles in the sealed portion. When the area increase rate α of the film was measured from this balloon expansion bag using the method described above, it was found to be α2100%.

Example 2 Balloon travel gear was produced in the same manner as in Example 1, and heated to 23°C.
, the moisture absorption rate was 2.5% after being left under 90% RH for one week.
In this case, the thickness of the balloon film: Tcm
, Seal strength/Skg/c+n, Young's modulus: Ekg/a
The relationship between m'' was as shown in Table 1.

When this balloon travel bag was filled with He gas and inflated to form a balloon inflation bag, the balloon inflation bag inflated like a rubber balloon without leaving any wrinkles in the sealed portion. When the area increase rate α of the film was measured from this balloon expansion bag using the method described above, it was found to be α-44%.

Example 3 Balloon travel gear was produced in the same manner as in Example 1, and heated to 23°C.
When left for one week under 70% RI-1, the moisture absorption rate was 1.
3%, and the thickness of the balloon film in this case: T
The relationship between cn+, seal strength: S kg/cta, and Young's modulus: E kg/cm'' was as shown in Table 1.

When this balloon travel gear was filled with He gas and inflated to form a balloon inflation bag, the balloon inflation bag inflated like a rubber balloon without leaving any wrinkles in the sealed portion. The area increase rate α of the film from this balloon expansion bag by the above method is
When measured, α=32%.

Comparative Example 1 Balloon travel gear was produced in the same manner as in Example 1, and heated to 23°C.
, after being left under 50% RH for one week, the moisture absorption rate was 0.4%.
In this case, the thickness of the balloon film: Tct
m, seal strength: S kg/cm, Young's modulus: Ek
The relationship between "g/cm" was as shown in Table 1.

This balloon travel bag was filled with He gas, and when the gas pressure was increased in an attempt to remove wrinkles from the seal, the bag broke at the seal.

Comparative Example 2 Balloon travel gear was produced in the same manner as in Example 1, and heated to 23°C.
, the moisture absorption rate was 0.1% after being left under 1O%RH for one week.
In this case, the thickness of the balloon film: Tcm
, Seal strength: S kg/ctn, Young's modulus: Ek
The relationship between "g/am" was as shown in Table 1.

This balloon travel bag was filled with He gas, and when the gas pressure was increased in an attempt to remove wrinkles from the seal, the bag broke at the seal.

Example 4 From the outer layer, ethylene-vinyl acetate copolymer (EVA: vinyl acetate content + (lit%)), vinylidene chloride-vinyl chloride copolymer (vinyl chloride content 130 wt%), ethylene-vinyl acetate copolymer (EVA: vinyl acetate content + (lit%)), A: Vinyl acetate content 10 wt%) After co-extrusion and lamination, the composition was stretched by the inflation method at a stretching ratio of 3.2 x 3.2 and a stretching temperature of 95°C.
A balloon film having a thickness configuration of (15μ/10μ/15μ) starting from the outer layer was manufactured. This film was melt-cut and sealed into a circular shape, and a blow hole was provided to prepare a balloon travel suit.

Thickness of balloon film in this case: T cm, seal strength: Skg/c+++1 Young's modulus: Ekg/cm
The relationship between `` and `` is as shown in Table 1. When this balloon travel suit was filled with Ie gas and inflated to make a balloon inflation bag, the balloon inflation bag did not leave any wrinkles on the sealing part and was made of rubber. It swelled like a balloon. When the area increase rate α of the film was measured from this balloon expansion bag using the method described above, it was found that α = 130%.

[Brief explanation of drawings]

Fig. 1 is a front view of the balloon suit, Fig. 2 is a side view of Fig. 1, and Fig. 3 is a folded shape remaining on the entire surface of the circular peripheral seal of the balloon inflation bag after gas is filled in the balloon suit. Figure 4 is a side view of Figure 3, and Figures 5 and 6 are enlarged sectional views of the film used in the balloon travel gear shown in Figure 1. It is.

Claims (1)

[Claims] 1. A balloon film used to construct a balloon by sealing it into a predetermined shape, comprising at least one base layer and a sealing layer on one or both sides of the base layer. and its thickness: Tcm, seal strength: Skg
/cm, Young's modulus: Ekg/cm^2, the relationship is S/(
A balloon film with excellent rubber elasticity, characterized in that E.T)≧0.05. 2. It has at least one base material layer and a sealing layer on one or both sides of the base material layer, and the relationship among the thickness: Tcm, sealing strength: Skg/cm, and Young's modulus: Ekg/cm^2 is S /(E・T)≧0.05 is used to seal in a circular shape to form a balloon original bag, and when filling the balloon original bag with gas to form a balloon expansion bag. , S_1 is the area of a reference circle for a balloon bag drawn from the center of the circle of the circular film constituting the balloon bag with a radius of 1/3 of the radius R_1 of the circular film for the balloon bag. 1 of the radius R_2 of the circle on the spherical surface of the balloon inflation bag from the center of the circle on the spherical surface of the balloon inflation bag when the balloon inflation bag is sealed and formed.
When the area of the balloon inflation bag reference circle drawn with /3 as the radius is S_2, the area increase rate α expressed by (S_2-S_1)/S_1 is at a gas pressure such that α≧0.3. A method for inflating a balloon, comprising filling the original balloon bag with gas.