JPS6013548A - Manufacture of plastic canning - 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 plastic box, particularly a plastic box manufactured by creasing a laminated sheet made of a combination of special films and sheets.

Polypropylene wood is used for the conventionally used plastic turning wheel, and the seal 1 is made of a polypropylene resin sheet with silk screen printing applied to the surface. however,
The printed surface may be damaged by external forces, especially scratches and scratches.
It can be said that having a printed surface on the surface is undesirable as it may peel off or impair the appearance. On the other hand, making boxes from plastic sheets uses polyzolopyrene resin.
Although it has become popular recently, the raw material is generally not fixed as long as it is a plastic that can withstand bending. ′ However, plastics with excellent bending properties
In general, since the material is soft, the surface is easily scratched, especially
Materials that are transparent have the disadvantage of lowering their commercial value.

A possible method to overcome this drawback is to print on a transparent film with a scratch-resistant surface and laminate a sheet on the printed surface, but general thermoplastic resin has the drawback of poor box-forming properties. .

The present invention solves these drawbacks by printing on a special film that is hard to scratch, and pasting a thermoplastic resin sheet with a folding strength of 200 times or more, which is preferable for imparting box-forming properties, to the printed surface. By combining the two, it is possible to provide a method for manufacturing a plastic box that is easy to press and has excellent transparency and box-manufacturing properties. However, the present invention has the following features: 1)
Printed (a) Biaxially oriented polyester, polypropylene, and polyamide (BL) One type of film selected from polypropylene, acrylic resin, styrene resin, and saponified ethylene-vinyl acetate copolymer TA+, (BL) and 2) a laminated sheet consisting of one type of sheet selected from polypropylene, polyester, vinyl chloride, and styrene resin having a folding strength of 200 times or more is pressed and made into a box.

After manufacturing the box of the present invention, the thermoplastic resin film on the inner and outer surfaces or the inner surface of the box includes biaxially oriented polyester resin, biaxially oriented polypropylene resin, non-oriented polypropylene resin,
It is one type selected from biaxially oriented nylon resin, acrylic resin, styrene resin, and saponified ethylene-vinyl acetate copolymer (hereinafter referred to as film), and these films have excellent printability. be. Further, as the acrylic resin, methyl methacrylate resin and a mixture of butyl acrylate and methyl methacrylate are used. Furthermore, as styrene resin, styrene resin,
A mixture of a styrene resin and an impact-resistant styrene resin and/or a styrene-butadiene block copolymer having a butadiene content of 5 to 50% by weight is preferred. Further, as a printing method, any of gravure, flexography, offset, etc. may be used.

Next, the sheet that becomes the base material of the box of the present invention is a sheet that does not impair transparency after being laminated with the film, specifically, y
: According to the test method of CS 7P8115, bending strength is 200 under the conditions of bending angle of 60 degrees, load of 1 to 9, and rotation speed of 175 rpm.
Polypropylene resin, which is a thermoplastic resin with a polypropylene content of 20 to 50 parts by weight (relative to 100 M parts of resin), a vinyl chloride resin containing a butadiene content of 12.5 to 50 parts by weight (based on 100 M parts of resin)
65% by weight, and a mixture of a styrene resin and a styrene-butadiene block copolymer having a total butadiene content of 12.5 to 65% by weight. It is a sheet.

Further, the styrene-butadiene block copolymer is a block copolymer having a butadiene content of 10 to 80% by weight, and has the general formula 'C1, (X-Y)n or cx
-x) n-x (x is a styrene polymer block, Y is a butadiene polymer block, and n is an integer) is a star-shaped block copolymer with a linear block.

Also, as for the structure of the block, even if it is a complete block, it is
Block X and Block Y seen in No. 8-48546
Any tapered block structure containing an XY silane copolymer in the transition region may be used.

Furthermore, if the amount of plasticizer in the vinyl chloride resin and the amount of buxene contained in the styrene-bumegen block copolymer or the mixture of this copolymer and styrene resin are outside the range, it may easily fall off during box manufacturing. The performance as a box is reduced to +1, and the shape after making the box is unsatisfactory.

The most preferable manufacturing method for the film and sheet of the present invention is to laminate them with an adhesive with the printed side facing the adhesive side, but if the film and sheet are made of the same type of resin, simple heat bonding is also possible. .

Next, the manufacturing methods for lamination include 1) dry lamination method, and 2) applying an adhesive that can be fused to the base sheet by heating on the surface of the printing film in advance, and then extruding the base sheet while extruding the sheet. 3) An extrusion lamination method in which both base materials are laminated with the printed side facing inside while extruding the adhesive resin; 4) A method that can be laminated using just the base material and heat. In the case of a film, any method may be used, such as directly laminating the substrate while extruding it with the printed surface facing the inner surface without using an adhesive. However, method 2) is the most preferable in terms of manufacturing cost and quality.

When the box of the present invention is manufactured by creasing the unfolded sheet, the sheet is made of a crimp mold with a width of 0.2 to 2.0 feathers and a flat tip or a crimp mold with a radius of 20 mm. Thin part is 0.1
It is preferable to set it to 5 to 0.5 mm,
It is more preferable to apply a slight temperature when pressing the strips.

Furthermore, there are several ways to bond boxes, such as using adhesives and ultrasonic bonding. However, if the bonding surface of the box is made of the same type of resin or a resin that can be fused using ultrasonic waves, the adhesive strength after bonding may be reduced. Considering this, ultrasonic bonding is preferable.

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

Examples 1 to 13 As the thermoplastic resin to be the base sheet of the box, a mixture of styrene resins of ps-3, p-4 and p-5 shown in Table 1 with a styrene-butadiene block copolymer, and KP were used.
Using one selected from P, 0PRiT, and p'V f;, the films shown in Table 6 were used as printing films, and the box formability and physical properties after lamination were displayed.

Table 1 Comparative Examples 1 to 8 Styrene resin and styrene-butadiene block copolymer of P-3 and p-4 in Table 1 and p-1 and p-2 shown in Table 2 as base sheet for boxes mixture with as well as 0PKT
Using one selected from PVO and PVO, the films shown in Table 4 were also displayed as printing films.

Table 2 The sheets and films in each table, and the physical properties measured were as follows.

1) Styrene resin: Manufactured by Denki Kagaku Kogyo Co., Ltd., trade name [Denka Styrol, GP-1J] 2) Styrene-butadiene block copolymer: Manufactured by Denki Kagaku Kogyo Co., Ltd., trade name U Denka Styrol, Clearene 760. 3) pp: Polypropylene, manufactured by Chisso Corporation, product name [Sheet obtained by extruding F3122J 4) cpgT
: Unstretched polyester resin sheet, manufactured by Teijin Ltd., trade name "Tetron Sheet" 5) PVO, vinyl chloride sheet, manufactured by Sumitomo Bakelite Co., Ltd., trade name "VSS Sheet" 6) MMA near-acrylic film, Mitsubishi Rayon ( Co., Ltd., product name [Acryprene HBS J 7) PKT: Biaxially oriented polyester film, Toyobo Co., Ltd. 0) M, product name [Nispera) J 8) OFF: Biaxially oriented polypropylene film, Toyobo Co., Ltd., product name Product name "Bairen" 9) OFF: Polypropylene film, manufactured by Gengen Plastics Co., Ltd., product name [Toko Boliace RJ 10) PEI: Polystyrene film, manufactured by Denki Kagaku Kogyo (
Co., Ltd., product name "Haren L" 11) L: ethylene-vinyl acetate copolymer saponified film, Cran Co., Ltd., product name "EVAL F" 12) ONY: Biaxially stretched nylon film, Toyobo Co., Ltd. Co., Ltd., trade name "Harden" Method A for laminating sheets and films: Adhesive was applied to the film in advance, and while the sheet was being manufactured, it was pressed and laminated with a hot roll.

B: The film was directly bonded to the sheet in a molten state at the time of sheet production.

Physical properties 1) Folding strength: J, r, 5-pBiis, bending angle 60
degree, load 1 kg, rotation speed 175 rpm 2) Formability: The laminate sheet is crimped to a width of 0.8 mm and a minimum thickness of 0.2 to 0.3 mm, and then this sheet is used to The number of breaks due to bending was measured. The counting method for one time is as follows.

Muscle push sheet (horizontal state) → Muscle push Fold the part inside VCl 30° and reverse it. Return 360″-+180 to (initial state state) As a result of measurement, it can withstand more than 6 times. Those that have the property of being formable are considered to have box-manufacturability.

6) Resistance to scratches: Measured by combining ASTM=D673 sand drop test and AEITM-D1003 haze test.

In the table, "Blank" indicates the haze before sand removal, which indicates the transparency of the box manufacturing base material, and after sand removal, the haze after dropping 100 g of sand onto the laminate film and scratching the surface. The value (difference) obtained by subtracting the blank haze from the value is shown. In other words, as a guideline for ease of damage, the value after falling sand needs to be small, but we have determined that a value of 40 width or less, preferably 60 or less, is practical, and anything over 40 width. is defined as X, and anything less than this is defined as 40 or less.

The plastic boxes obtained in this way can be used in a wide range of fields, including cases for storing VTR cassettes, cases for Book-K A compact discs, audio equipment, etc., and boxes for storing sweets, toys, etc. It can be applied to

As described above, the present invention is a box made of a laminated sheet of a base sheet with excellent bending strength and a printed film, which is excellent in processability of the crimp development type box, and is transparent because it is resistant to scratches. It is a plastic box that does not deteriorate in quality.

Patent Applicant: Denki Kagaku Kogyo Co., Ltd. Procedural Amendment July 2, 1982 Kazuo Wakasugi, Commissioner of the Patent Office 2, Title of Invention: Process for Manufacturing Plastic Boxes 6, Relationship with the Person Who Makes the Amendment Case Patent Applicant: Address 1-4-1 Yurakucho, Chiyoda-ku, Tokyo Name (3
29) Denki Kagaku Kogyo Co., Ltd. Specification, Column 5, Detailed Description of the Invention, Contents of Amendment, Page 5, Lines 2 to 4 [Repropylene Resin]
65 weight factor -1 as "lipropylene resin, polyester resin, vinyl chloride resin, 5 to 30 parts by weight of plasticizer (
0 to 20 parts by weight of vinyl chloride or plasticizer (per 100 parts by weight of resin)
Vinyl chloride copolymer, x One selected from tyrene-vinyl acetate-vinyl chloride graft copolymer, ethylene-vinyl chloride copolymer, urethane-vinyl chloride copolymer, etc., and a butadiene content of 12.5 to 65 Weight Section”
I corrected Zuro.

Claims (1)

[Scope of Claims] 1) Printed (al) biaxially oriented polyester, boria 0 robylene and polyamide (bl) polypropylene, acrylic resin, styrene resin and saponified ethylene-vinyl acetate copolymer (al, ( A laminated sheet consisting of one type of film selected from BL and 2) one type of sheet selected from polypropylene, polyester, vinyl chloride, and styrene resin with a severe folding strength of 200 times or more is pressed and made into a box. A method for manufacturing plastic boxes.