JPS6178617A - Manufacture of thermoplastic resin container - Google Patents

Abstract

PURPOSE:To obtain a thermoplastic resin container having a picture that is formed when the injection molding is carried out, by forming an expanded plate having notched sections and folding line sections by injection molding. CONSTITUTION:A mold for molding an expanded plate comprises a stationary mold 21 and a movable mold 22, and a melted thermoplastic resin is fed into a cavity 24 from an injection cylinder 23 via a runner 25 formed in the stationary mold 21. Thus a expanded plate 2 having a printed picture that is in the shape of a polygon, and has notched sections, folding line sections 12 and a window 20 can be injection molded. The expanded plate 2 can be made into a synthetic resin container. As the thermoplastic resin to be injection molded use is made of a thermoplastic resin that contains 50% or more of a polypropylene resin having a melt index of 15-80g/10min, or a mixed resin that is made up of 50-97wt% of a polypropylene resin, and L-LDPE resin having an MI of 5-80g/min and balance of other components.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is applicable to tapes for video tape recorders, single disks of a certain volume, floppy disks, video disks, digital audio disks, photosensitive disks, etc. The present invention relates to a method for manufacturing a container made of a specific thermoplastic resin suitable for accommodating products such as sheet films of materials, printed circuit boards, and IC printed boards.

[Prior art]

Thermoplastic resin containers with small volumes such as those mentioned above can be three-dimensionally molded by direct injection molding, but cases that store items larger than a certain volume, such as tape cassettes for video tape recorders, can be molded using direct injection molding. place kcF
i. A method is used in which boxes are manufactured from compacted and expanded plates, which is impossible to perform three-dimensional molding by direct injection molding.

Conventionally, the development plate for such synthetic resin containers is made by extrusion molding into a long length from a T-die, printing it on a flat plate of fixed thickness, and then cutting it into a plate of a fixed size. After that, the area that meets the crease (hereinafter referred to as the ``key line area'') f is compressed and shaded, or the notch is punched out, and in some cases, the surface is stamped with foil or stamped. It is manufactured through processing.

However, such conventional manufacturing methods require a large number of man-hours and are inefficient, lack uniformity in the strength of the silicon wire, surface shape, thickness of the developed plate, etc., and in terms of quality, the incidence of defective products is low. In addition, when shaping and cutting the wire, the wire cracks may occur, and the surface of the wire groove is rough and rough, and debris adheres to the cutting surface, resulting in a poor appearance. Since the cutouts and cutouts are completely discarded, there are inconveniences in terms of cost and industrial waste generation.In addition, in terms of quality, cutouts and other punched edges are crushed and cut scraps are generated. If they fall off during use, for example when storing video cassettes, they will stick to the tape and cause dropouts (
It is also impossible to process special shapes or fine lettering or shape embossments by partially changing the thickness to differentiate the sound.

In order to eliminate all of the drawbacks of the prior art as described above, the present inventor first proposed that a developing plate for such a synthetic resin container be manufactured by injection molding. 4o
o7). In other words, it has been considered difficult to injection mold a spreadable plate with a wide area over a certain amount using resin, and there have been no attempts to do so. Have 1! ! It has been discovered that it can be made by open sheet metal injection molding, and that by doing so, the drawbacks of the prior art as described above can be completely overcome.

[The intermittent point that the invention attempts to solve]

However, various printing methods (silk screen printing, offset printing, flexible printing, gravure printing, tampo printing (= curved surface printing), electrostatic transfer printing) can be applied to the developed plate having the T-line portion and notch portion obtained in this way. , hot stamping (= foil stamping), transfer printing, inkjet printing, one-rotation roll printing, etc.) to create a printing layer of one or more types of one color (if necessary, apply a primer to improve printability or take precautions to protect the printed surface). (You may add a protective layer.) After cooling, cool air.

It is necessary to fix the entire printed layer to the development plate by hot air, various types of air, infrared irradiation, ultraviolet irradiation, electron irradiation, etc.
c.

The above method requires steps such as printing to obtain a painted development plate, which increases the cost. An attempt was made to create a desired patterned development plate at the same time as injection molding by painting it at the same time as creating a development plate with parts and notches.

However, such a developing plate has an average thickness of about 0.3~
Since the Jilt area is 10OCIL2 or more and the average thickness of the core wire is λoes or more thinner than the average thickness of the developing plate, the molten thermoplastic resin composition is uniformly distributed from the gate into the mold during injection of the thermoplastic resin. If this is not done quickly, the flow and distribution of the molten resin will become uneven, resulting in uneven thickness and problems.
．． Problems such as wrinkling, weld lines, poor adhesion to the printed decorative film, insufficient strength to tear the diamond wire, and insufficient strength to drop and tear the developing plate were encountered.

Therefore, the inventor of the present invention has carried out extensive testing in order to produce a complete thermoplastic resin development plate with simultaneous injection painting that has high physical strength, good suitability for box manufacturing, and has minimal warpage and kinks, and as a result, the present invention? Achievement friend.

[Purpose of the invention]

Accordingly, one object of the present invention is to provide a method for manufacturing a thermoplastic resin container that is decorated at the same time as injection molding.

Another object of the present invention is physical strength (tear strength, drop strength,
High impact strength, etc.), small warping, twisting, etc., good appearance, and resistance to scratches, etc., for painted thermoplastic resin containers.
An object of the present invention is to provide a method for manufacturing a developed plate at the same time as injection molding.

[Means for solving problems]

The above objects of the present invention are achieved by the method of the present invention described below. In other words, a painted development plate having a diagonal line part and a cutout part is placed in an injection bottom mold (including a vacuum injection mold for all molds and a multi-layer mold) and a printed decorative film (decorative film, painted film, etc. In addition to 7tvk, which performs vacuum preforming (including printing display films, etc.), injection molding (including printing display films, etc.)
Achieved by manufacturing a thermoplastic resin container by creating an injection molding simultaneous painting system that integrates the printed decorative film and the injection molding base material (including vacuum injection molding in the entire mold), and then manufacturing the same into a box. be done.

Materials for the printed decorative film used in the present invention include vinyl chloride film, ABS film, polystyrene film, and polyester film.

Thermoplastic resin films such as polyethylene films are preferred. As the thermoplastic resin film, both unstretched and stretched films can be used.

The present invention will be explained in detail below.

The thermoplastic resin used in the present invention has a melt index (M, 1.) of / jf // 0 minutes or more and! .

It has a bending elastic modulus of 000 ky/ca2 or more.

M used here, 1. J Engineering SK721O (ASTM
Using an extrusion type blast meter, the molten resin was flowed out at 3 o'c with a load of 4) c4F using an extrusion type blast meter. Measure the amount of outflow in the case.

This is expressed in units of 9710 minutes.

M91 The bending elastic modulus in the present invention is JISK-7=03
This is the measured value.

The thermoplastic resin used in the present invention has a melt index t z, r O? lI 0 min, preferably co 0-1
．． 0? /10 minutes, particularly preferably 30-! oy7i o
or a polypropylene-based polymer containing 10 or more parts by weight of such polypropylene resin. Homopolypropylene is a polypropylene resin.

Propylene-ethylene block copo 117-, fluoropylene-ethylene random copo 11-mer, fluoropylene-C2
~CIO α-olefin copolymer, 1111 polypropylene, crosslinked polypropylene, etc. are used for electrolytic corrosion or as a mixed resin of two or more types.

Nine, is the thermoplastic resin a polyolefin polymer? When the polyolefin polymer contains MI
High-pressure low-density polyethylene (L-LDPE), ethylene-ethyl acrylate copolymer 11-mer (EEA), ethylene-vinyl acetate copolymer (EVA), etc. with zy7io or more? It is preferable that it contains.

In the present invention, a polypropylene resin made of a copolymer of propylene and ethylene is used in order to improve adhesion with the printed decorative film, improve the tear strength of the diagonal line part, and improve the falling ball strength and tear strength of the developing plate.
Alternatively, blend resins with LDPE, ionomers, EEA, and EVA are preferred.

In particular, a polypropylene resin with an MI of /j-109710 minutes, a low-pressure normal low-density polyethylene resin of 3-jO, with an MI of /j-109710 minutes, and an additive component other than these, ≠7 degrees by weight. The following resin compositions are preferred.

Furthermore, the thermoplastic resin used in the present invention may contain various additives depending on the purpose. Can include, for example, nucleating agents, white or colored pigments, metal powders.

It may contain dyes, lubricants, ultraviolet inhibitors, antioxidants, electromagnetic shielding substances, fillers, inorganic fibers, etc.

Aluminum powder is used in the form of fine powder or fine flakes, but aluminum paste is generally used for materials that are easily oxidized and have the risk of explosion. Therefore, the term aluminum powder in the present invention also includes aluminum paste.

Aluminum paste here is made in the form of a single stroke in the presence of White Spit 11 and a small amount of stearic acid when making aluminum powder using the ball mill method. Molten aluminum is made into powder by the atomization method, granulation method, 5-rotation disk dropping method, evaporation method, etc.In addition to the nine things, aluminum powder is made into flakes KLy.
Taste the tits.

Next, when dispersing the above-mentioned Kuhiro color pigment, aluminum powder (including aluminum yeast, the same applies hereinafter), etc. in a thermoplastic resin, add the aluminum powder to the resin, stir with a heating and melting mixture, A well-known method is applied.

The amount of white or colored pigments, aluminum powder, etc. to be added is determined from the viewpoint of injection bottom shape, packaging material suitability, and manufacturing cost, from 0.3 to 0.0 - 1 by weight of the thermoplastic resin, especially O6! -10 weight is desirable.

The thermoplastic resin container of the present invention with injection molding and simultaneous printing having a cut-out part and a cut-out part uses an injection mold having at least a cut-out part and a cut-out part. 1
After vacuum pre-bottom shaping of the film (designs, etc.), the inner surface is further coated with thermoplastic resin, preferably with an MI of 7 to 7.
Injection molding (including vacuum injection molding in the entire mold) 1' of a polypropylene resin of 109/10 or a polypropylene polymer containing 50% or more of polypropylene resin by weight was carried out.

The decorative film with printing is integrated with the thermoplastic resin molded base material, and the transparent line part and notch part? It can be obtained by preparing a thermoplastic resin development plate with simultaneous injection molding and printing, and then manufacturing the entire plate into a box. The typical steps are shown below.

1st material: Clamp and heat the printing film↓
do.

Part 1: Cosmetic film with printing while heating↓
Move it to the front of the mold.

3rd step: Printing on the inside of the mold by vacuum forming↓
Make a preliminary bottom shape of the decorative film.

Step ≠ The clamp rh sushi heater is returned to its original position (return mold is tightened, mold clamping and printing ↓ Trimming of decorative film with printing is done.

No.! Process The mold is tightened and the decorative film with printing is produced↓
11 After performing the 11-mining process, injection molding is performed.

Step 1: After cooling, the mold is opened and the product is taken out to obtain a painted thermoplastic resin development plate having a diagonal line and a notch.

The characteristics of the present invention are as follows: (11) The quality is stable as the decorative film with printing is continuously supplied to the injection bottom molding machine, and the finished product has less velocities than the conventional offline printing method and is finished at a low cost.

(2) Vacuum preforming of the printed decorative film is performed in an injection mold, followed by injection molding of thermoplastic resin, resulting in clean three-dimensional makeup without wrinkles.

(3) In the case of printed decorative film lamination method, is the printed decorative film trimmed in the injection mold? It is easy to perform trimming in the post-process as required.

(4) In the case of the transfer method of decorative film with printing, only the design part is transferred to the molded product, and in-line painting is also possible on the narrow lines and notches.

(5) It is possible to manufacture not only a vertical injection molding machine but also a commonly used horizontal injection molding machine by simply making some modifications and installing a special painting device.

The inventor first proposed feature 1c as a method for efficiently producing at low cost a thin developing plate with a good appearance without twisting, etc., having such a diagonal line part and a notch part, and developed a friend mold. The internal vacuum injection molding method (patent application Shoj Tarr≠Hiroko) is preferable because it is possible to use the printed decorative film as an injection mold that also serves as vacuum preforming, and it is preferable to apply the printed decorative film to the surface of the thermoplastic resin development plate. Since the printed decorative film is covered, it is possible to improve the tear strength, drop strength, impact resistance, etc., and to make the surface less likely to be scratched.Also, the haze level at one thickness is 4 to 4 or less, preferably 4 cO. By using thermoplastic resin of less than
By using the printed decorative film shown in the figure (■), it is possible to obtain an inexpensive expansion board with a transparent window and printed displays, pictures, designs, etc.

In the method of the present invention, the most preferable resin composition as a thermoplastic resin base material for injection molding used in injection molding (including all-in-mold vacuum injection molding) will be described in detail. The main thermoplastic resin is polypropylene resin, and various known polypropylene resins such as homopolypropylene resin, propylene/ethylene random copolymer resin, propylene/ethylene block copolymer resin, isotactic propylene resin, etc. One or more nucleating agents at 0.0~
The propylene/ethylene random copolymer resin containing 5% by weight is excellent in terms of cost, printability, dimensional stability, surface strength, rigidity, transparency, injection moldability, etc. The sub-thermoplastic resin is L-LDPE resin.

Here, low pressure normal low density polyethylene (L-LDPE)
Is a copolymer of ethylene and α-olefin, and the number of carbon atoms is ethylene! , / 7 pieces preferably Hahiro ~ 10 pieces α
- It is a copolymer with olefin, and is a polyethylene polymer with a linear straight chain structure with short branches, and has an ethylene content of 10~? 9. ! Mole whisper, α-olefin 0. j
~1O molar range are suitable for the present invention. This low-pressure normal low-density polyethylene L-LDPE is generally produced by a low-pressure method, and the density is generally considered to be low to medium density, but the one that can be used in the present invention is 0,9/~O6 5'/ c.
m”, preferably within the range of 0.9/
~O1≠2/α2.

Butene is an α-olefin that copolymerizes with ethylene.
Examples include 71 octene-71 hexene-/, tA methylpentene-7, etc., and μ is preferable for improving physical strength.
Methylpentene-11hexene-7 is used. Specific examples of L-LDPE that can be used in the present invention include Unipol (060), Dowlex (Dow Chemical), Sflare (DuPont Canada), Stamilex (DSM), and Marlex (Philips). company)
, Urtozex (Mitsui Petrochemicals), and Yasseki Sunilex (Yasseki Resin Chemicals). These L-LD
Particularly preferable PEs have ethylene and O~yq
, r molar content, α-olefin content o, r~io
Mol*, M, 1. o, 4c~iz, density 0.9/~0.
9441/crIL2, using hexene-11 or ≠methyl intene-1 as the α-olefin.

The product names include Urtozex (Mitsui Petrochemical) and Stamilex (DSM).

Main polypropylene resin and sub L-LDPEJ1
Various thermoplastic resins can be used as the thermoplastic resin that can be added in addition to the 4 fats, and polyolefin resins (including copolymers with ethylene), polystyrene resins, etc. are particularly used. Examples of polyolefin resins include various polyethylene () TDPE, MDPE,
LDPE), polyethylene and its copolymer (ethylene/
Ethyl acrylate copolymer, ethylene vinyl acetate copolymer), ionomer resin, polystyrene, polyisobutylene, polyethylene, polypropylene
Or two or more can be used.

However, from the viewpoint of improving physical properties, polyolefin resins are preferable, such as LDPE, MDPE, )TDPE, PPXEEAX
It is desirable to use thermoplastic resins such as EVA, ionomer, and polybutene 7 alone or in combination.

EMBODIMENT OF THE INVENTION Hereinafter, the embodiment of producing a painted spread plate according to the present invention will be described with reference to the drawings.

Figure 1 shows a typical example of a device for simultaneous injection molding. Second
The decorative film with printing is placed between the molds shown in the figure 2
moves to the second side of the movable mold while being heated by a heating device (heater) λ7. Next, the printed decorative film 24 is formed into a preliminary bottom shape on the inner surface of the movable mold by vacuum forming. Subsequently, the clamp is removed, the heater 27 returns to its original position, and the mold is tightened to the state shown in Figure 2. After trimming the film, the molten thermoplastic resin is poured into the cavity λμ. Perform injection molding, open the mold after cooling,
For the painting with the line part and the notch part, take out the thermoplastic resin development plate λ (Fig. 1).

FIG. 2 is a schematic sectional view showing an example of an apparatus used for injection molding in the present invention.

Although this example illustrates a mold having one cavity for molding the expansion plate, the present invention is not limited to this, and molding cavities are provided on both sides of the fixed mold, and injection molding is performed from one injection tube. Use a double-stack mold that allows molten resin to be supplied to both cavities at the same time, or a multi-stack mold that increases the number of cavities and allows molten resin to be supplied from one or two injection tubes. be able to. Further, depending on the case, a vacuum injection molding method may be adopted in which an exhaust device is provided and the cavity is evacuated before supplying the molten resin.

The illustrated mold consists of a fixed mold 2/, two movable molds, and an injection tube λ3, and a cavity 2μ for molding a developing plate is formed between the fixed mold 1 and the movable mold 2, and the fixed mold λ A hot spring formed inside! The molten thermoplastic resin is supplied from the injection cylinder 3 to the cavity μ through the injection cylinder 3.

In the present invention, a synthetic resin container with a window in the shape of a rectangular parallelepiped and having an open opening on the negative side as shown in FIG. Ru.

In Fig. μ, the illustrated development board ko is front part 1: rear part j:
Upper left surface part 6: Upper right surface part 7: Left mounting surface part t: Right bottom surface part Tani back surface lO: Flap/1. //It consists of a 3° cross section saw and a window section λO, and by forming these into a box, a synthetic resin container l as shown in FIG. 3 is formed. In Fig. 3, the correspondence of each part of the development plate in Fig. 2 is 7 laps/l/
・It is filled in except for iiH and the line saw.

Conventionally, synthetic resin containers 1 as shown in Fig. 3 have been made from a flat resin sheet metal with a constant thickness extruded into a long length from a T-die and then cut in the case of a case that stores something over a certain volume. After making the notch and the window shown by the diagonal lines in Figure 1 into a rectangular plate that is not cut out or punched, the diagonal part s1 is formed by pressurizing or cutting with a saw.
r: Cutout part 13, 7μ, /j, /4 and window part -2
After 0f punching, a transparent or translucent sheet was pasted on the window S and Q, and in some cases, the front part μ was embossed to create a development plate, which was then manufactured into a box.

According to the present invention, the illustrated development board 2 as shown in FIG. It is made by injection molding in a shape having irregularities, etc., and is made into a box to make a synthetic resin container l as shown in FIG.

In the method of the present invention, various thermoplastic resins can be used as the thermoplastic resin used in injection molding, as described above, including polypropylene resin, polyolefin thermoplastic resin (including copolymers with other thermoplastic resins) , or a polystyrene thermoplastic resin or an ABS thermoplastic resin A mixed resin of 2tI or more is used, and in particular, a jO content of 1 or more has a melt index of 16. rO
? /10 minutes polypropylene a! The thermoplastic resin is a fat, and the polypropylene resin jO ~ 27% by weight and M
Ij, 40? /min oL-LDPE tree J] W, mixed resins with the remainder consisting of other components, especially propylene-ethylene random copolymer resins in which polypropylene resins contain o, oi-co parts by weight of various nucleating agents, are cost effective and printable. , manufacturing accuracy,
It is suitable in terms of dimensional stability, wire strength, surface "?W", R property, suitability for injection molding, etc.

These thermoplastic resins KO13~ used in the present invention
If necessary, these thermoplastic resins may be blended with various blowing agents, white pigments (titanium oxide, Merck, mica, calcium carbonate, clay, etc.) as described above. Various types of carbon black, various types of white pigments and colored pigments, various types of metal powders and metal fibers, various types of organic or inorganic fiber substances such as glass fibers and carbon fibers, various other types of colored dyes, various types of antistatic agents, Various silicones, surfactants, lubricants such as sodium stearate, antioxidants, and various other additives can be added.

Furthermore, when injection molding is performed in the method of the present invention, the injection port (gate) for the molten thermoplastic resin is not limited to one location, but can be provided at multiple locations. By doing this,
The flow of the thermoplastic resin improves during injection molding, and it is possible to prevent the occurrence of a boundary line where the flow of the thermoplastic resin joins, which is called a weld line. These injection ports (gates) are shown on the inside of the container in order to improve the fluidity of the thermoplastic resin in terms of the appearance of the container and in the case of a structure in which the diagonal line is provided only on the surface of the container as shown in Figure 3. taX 1%X2,
Y 2 , X 3, Yl, Y3 (represented by pin gate),
Or the product end of the notch /3, /μ, /j, Xl (representatively the side gate), or the left and right overlapping parts? , 10 or the front, back, and end portions of the flaps //, //, preferably at least 1 locations, preferably in the vicinity of left-right or vertically symmetrical positions, where the thermoplastic resin can flow in approximately equal time to the four corners. .

It is particularly desirable to have a thermoplastic resin injection port (gate) of 7.
If only one location is required, install it at the X and Y2 positions in Figure 1. If it is placed in a moss area, it should be placed at the positions Yl and Y3 in Fig. 2.

As another example of providing λ positions, it is also desirable to provide them at the positions X1 and X3 in FIG.

Note that Xl...X4 and Yl...Y4 are distances between each gate.

In any case, in the present invention, the number and position of resin injection ports (gates) are determined depending on the shape of the developing plate, the fluidity (melt index) of the thermoplastic resin, the ease of generating gate marks, the ease of generating weld lines, etc. Since the present invention is not limited to the above description, any number or shape can be adopted at any position on the expansion plate, and the injection bottom shape is suitable and the surface (visible surface) of the container when manufactured. ) is desirable from the viewpoint of appearance and fluidity of the resin.

In the present invention, aluminum powder, white or colored pigments, etc. are added to the thermoplastic resin to improve the appearance, and silicon compounds such as polydimethylsiloxane, surfactants such as saponin, or stearic acid, etc. are added to the thermoplastic resin. Use lubricants such as higher fatty acid metal salts at 0°O/~! By adding weight% ffS, fluidity, bottom moldability, mold release property during molding, and slipperiness after bottom molding can be improved. In addition, by adding an antistatic agent to the thermoplastic resin, it is difficult for dirt and dust to adhere to the container, or by adding a foaming agent to the thermoplastic resin, the appearance of the container is changed, the texture is improved, and the weight is reduced. It may also be optionally possible to do so.

When a thermoplastic resin container as shown in FIG. 3 is entirely manufactured by the method of the present invention, the development plate as shown in FIG. Preferably, the shape is as shown in the figure. Further, in the second figure, the wires are provided only on one side of the expanded oak, but they may be provided at symmetrical positions on both sides. The plate thickness t is 0.
Generally, the thickness is from about 3 to about 7111, and the thickness of the cut-out part and the silicon wire should be made thinner than the average plate thickness tK of the developed plate by at least 104 mm, preferably at least 1.04 mm, and most preferably by at least 1.04 mm. The development plate having the parts is less likely to warp or twist, and can be easily manufactured. In the present invention, the thickness of the expansion plate, which is an injection molded product, is 0.5 mm in order to ensure cooling efficiency, prevention of warping, sink marks, and twisting, and ensuring strength. Limited to J to JIIIC, the line part is 104 or more, preferably 11 or more, most preferably 11 or more, with respect to the plate thickness tK, in order to prevent warpage and sink marks when printing ink sticks, ensure fluidity of the thermoplastic resin, and facilitate KW boxing at the same time. Preferably, it is necessary to make it thinner than tOS, and from the viewpoint of strength, it is at least 0. It is necessary to ensure a thickness of /1 rM or more.

In the present invention, before manufacturing the box, embossing, stamping, grooves, etc. are applied to the outer or inner surfaces of the front, back, entire surface, front surface, rear surface, left upper surface 6, right upper surface 7, left bottom surface, etc. Recessed parts are also selectively added to improve the appearance and ease of handling. In conventional manufacturing methods, these were performed by embossing, but in the method of the present invention, these surface treatments can also be performed during injection molding.

Furthermore, according to the present invention, not only can a developing plate with a transparent window be produced during injection molding, but also painting can be performed during injection molding.

That is, according to the present invention, a developing plate with a picture (with a transparent window if necessary) having a cross section and a notch can be formed at the same time during injection molding.

In contrast, in conventional manufacturing methods, sheets are created using a T-die,
It was an expensive product that required numerous steps, including surface treatment, printing, drying, punching into the required shape with notches, manual stamping, key line stamping, and foil stamping.

〔Example〕

Next, in order to further clarify the effects of the present invention, examples are listed below.

fi+ A λ stacked single mold with one cavity for injection molding on both sides as shown in FIG. 2 was used.

The equipment shown in Figure 1 was used for the painting. In this case, the mold was designed so that the dimensions of each development plate were as follows. The resin injection ports (gates) were located at seven locations Yl inside the development plate (inner bottom surface in contact with the articles to be housed in the box) in Fig. μ.

Vertical and horizontal dimensions of the expansion plate: The longest part is λ≠7 II Deployment plate roughness: 0. r.

Prototype &/, /l transparent window dimensions: 70fl x 20mm. Snow, thickness o, TFL prototype flat// is smooth on the back and back Prototype A/ is machined/bossed on the back, smooth on the front Dimensions of the wired part: Width i, r, depth O, ko! n Cross-sectional shape of the C-line part: As shown in Figure 3 Notch part /3, /
Dimensions of Hiroshi: Length approximately 70 silk, width 01 Dimensions of cutout parts /j, /bu: Polygon with longest part being 37 mm The plastic resin was fully in-mold vacuum injection molded; the results are shown in Table 2.

(31 Injection molding and simultaneous painting is done by assembling the thermoplastic resin development plate and welding the overlapping parts using an ultrasonic bonding machine.The approximate dimensions are 7 octopus blocks x IO!The beautiful uniform silvery white metallic color of Tsuru X Jr. We made a case for a videotape cassette made of gold.

Compared to the conventional manufacturing method that includes cutting, cutting, printing, and foil stamping when the number of boxes manufactured is 10,000 pieces, the manufacturing cost is reduced to ≠OL1, and the incidence of defective products is reduced by ear loss, cutting, and cutting. The loss and silicon tightening were 74 or less in the method of the present invention, compared to /1 in the conventional method, which includes loss and the like.

〔Effect of the invention〕

According to the method of the present invention, as the man-hours are reduced as described above, the manufacturing cost is lowered, and the tear strength of wires, the strong tear strength of the expansion plate, the impact strength against falling balls, etc. are improved, and the warpage and twisting of the expansion plate are improved.
The surface area has also been significantly reduced, and the flatness has also been improved. In addition to stabilizing the process, there is no cutting waste, and the appearance is reduced, scratches are reduced, accuracy is improved, the quality of the finished surface is improved, and the wire strength is improved.
By processing the shading and making the thickness of the developing plate uniform, significant effects such as automation of work and reduction of industrial waste can be obtained.

Furthermore, since it has a printed decorative film on its surface, it can be easily scratched and has physical strength (tearing, drop resistance, etc.).A developing plate with a transparent window is made of natural thermoplastic resin and is combined with a printed decorative film with a transparent window. Therefore, it can be manufactured easily and inexpensively.

The present invention is not limited to the embodiments, and can be widely applied, for example, as shown below.

m The shape of the expansion plate is not bilaterally symmetrical, and for example, the shape of the front part and the shape of the back part may be different.

(2) Even if the thickness of the side part is the same as the remaining thickness of the silicon wire part, the strength can be maintained by overlapping and joining.

(3) The shape of the notch is rectangular, square, trapezoidal, semicircular,
It can have various shapes such as semi-ellipse, equilateral triangle, isosceles triangle, and arrow shape.

(4) The remaining thickness of the wire part may be partially increased to improve the flow of resin during vacuum injection molding within the entire mold.

(5) The surface of the mold is processed to have transparent windows in more than one place on the expansion plate, and the product name, company name, picture, etc. are printed on the inside and outside surfaces of the case, and grains, grains, cords, vertical stripes, etc. , horizontal stripes, lattice,
It is possible to have a pattern (texturing) such as a fine-grain surface texture. As a specific grain processing sample, 21ON or more of "1 Pairon Shibo" published by Tokyo Pairon ■ is presented.

(6) For injection bottom molding, the thermoplastic resin can be a copolymer or a mixed resin of one or more thermoplastic resins.

(7) Thermoplastic resin contains 1 color pigment or color dye.
Seeds or quantities can be added.

(8) After the development plate is fully in-mold vacuum injection molded, marks and letters can be added selectively before and after the printing process, labeling process, and all box manufacturing processes.

(9) Simultaneous painting with injection molding is done using the same method. After vacuum preforming of the decorative film in the mold, the bottom shape is injected onto the inner surface of the decorative film. In addition to the film welding method that integrates the parts, a method of transferring only the design part of the transfer film to the molded product can also be used.

αυ The printed decorative film has a pattern with a transparent window, and the thermoplastic resin molded base material has a haze degree of ton or less, preferably ≠
Injection molding and simultaneous painting with a transparent window that is less than θ% can be made into a thermoplastic resin development plate.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a typical example of an apparatus for simultaneous painting of injection molding, and FIG. 2 is a schematic diagram showing an example of an injection molding apparatus used in the present invention. @ Figure 3 is an external view showing an example of a thermoplastic resin container with a simultaneous injection design manufactured according to the present invention, Figure 5 is a plan view of a painted development board, and Figure 5 is a plane A-B in Figure ≠. It is a sectional view of a developed plate. /... Thermoplastic resin container C... Painted development plate/J... Key line parts 13-16... Notch part 1/...・・Fixed type λ・・・・・・Movable type 3・・・・Injection tube 2 μ・・・・・・Cavity for forming the expansion plate!・・・・・・
... Yudo" 6 ... Decorative film with printing, 27 ... Heating device (heater) patent applicant
Fuji Photo Film Co., Ltd. Figure 3

Claims (1)

[Scope of Claims] 1) A method for producing a thermoplastic resin container, which comprises producing a painted development plate having a cross-section line and a notch using an injection molding simultaneous decoration system, and forming the same into a box. 2) The printed decorative film used to create the painted development plate using an injection molding simultaneous painting system is printed on a thermoplastic resin film using various printing methods. A method for manufacturing a thermoplastic resin container. 3) The injection molded base material of the painted development plate contains 50% by weight of propylene resin with a melt index of 15 to 80 g/10 min.
The method for producing a thermoplastic resin container according to claim 1, wherein the thermoplastic resin container is a polypropylene polymer containing the above. 4) The printed decorative film used in the injection molding simultaneous painting system for the painted development plate is a printed thermoplastic resin film containing 50% by weight or more of polypropylene resin, and the injection molding base material is propylene with a melt index of 15 to 80 g/10 min. The method for manufacturing a thermoplastic resin container according to claim 1, wherein the thermoplastic resin container is a polypropylene polymer containing 50% by weight or more of resin.