JPH04131221A - Manufacture of vessel with tongue piece for suspension - Google Patents

Abstract

PURPOSE:To form easily a vessel to which a tongue piece for suspension is formed, by a method wherein an injection cavity mold temperature, injection core mold temperature, premolded product and it length of its thick part and the thickness of the premolded product are specified into the values convenient for molding. CONSTITUTION:A premolded product 1A where a neck part 2 and a thick part 3 for formation of a tongue piece for suspension are formed is molded of a polypropylene homopolymer by an injection orientation blow molding machine ASB-250 by a method where an injection molding temperature is 220 deg.C, injection cavity mold temperature Ti is 0 deg.C<=Ti<=20 deg.C, and a relation of which with an injection core mold temperature Tc is made into 0 deg.C<=Tc-Ti<=30 deg.C. Then the premolded product 1A is made into a length L of an under a lip cavity and a relation of the length L with a length l of the thick part 3 is made into l/L=1/2 to 1/20. Furthermore, a mean thickness of the premolded product 1a, that is, a mean radius R of the outside of the premoded product 1A - a mean radius r of the inside of the premolded product 1A is made into R-V=2 to 8mm.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a six-piece container for hanging.

[Conventional technology]

JP-A-61-287728 discloses a conventional method for manufacturing a container with a hanging tongue piece and a 1° angle.

In the manufacturing method described in the above publication, first, a flat container is formed by blow molding. Next, this flat container is taken out from a mold. After forming a hole for hanging in the 1000' part of the container, U then soaked the soil on 7 sides of this hole for hanging (F to form the bottom of the lees).
7. After blow molding the container, remove it from the mold and hang it. After forming the lower hole, 1,
7 A new bottom is formed, which increases the manufacturing process 1
．． Specifically, the container thus formed is difficult to use because it is thin in the area excluding the hanging hole.

Therefore, the present applicant has developed a method for manufacturing a container with a hanging tongue piece, in which a tongue piece for hanging items is molded at the same time as blow molding. Hei 1-29
8274-@1 Special M Flat L - Entered in May 2982, Patent Application #2-187618, and appeared on Pu Island [Two problems to be solved by the invention] The present invention further deals with A fundamental problem is to provide a manufacturing method that can easily manufacture a container with a tongue piece for easy hanging.

Means for Solving Problems] First Invention Version A preformed product IA made of resin is formed by providing a thick wall portion 3 for forming 71 pieces for hanging by injection molding, and this preformed product IA is The intermediate molded product IB is obtained by performing a stretching process using a stretching temperature adjusting mold 18 and forming a hanging tongue piece 10 using a tongue piece forming mold 20.
5. In the method for manufacturing a container with a hanging tongue piece in which this intermediate molded product IB is main blow-molded in a main blow-molding mold 30, the injection core mold cooling temperature is set to Tc, and the injection core mold cooling temperature is Tc. When the mold cooling temperature is 1゛i, the injection core mold cooling humidity Te and the injection cavity mold cooling temperature Ti are 0°C.
Set the temperature to ≦Ti≦20°C, preferably 5°C≦Ti≦15°C, and set the temperature to 0°C≦Te-Ti≦30°C, preferably 5°C≦Te-Tj, <20°C1.
Then, a preform IA is formed and a container with a hanging tongue is formed! ! The second invention as a manufacturing method is to form a preform IA made of synthetic resin with a thick wall part 3 for forming a live piece for hanging by injection molding. Type 18
Stretching by blow-blowing]: Then, an active mold 20 is used to form the hanging tongue piece 10 to form an intermediate molded product IB, and this intermediate molded product IB is subjected to main blowing. In the !8! construction method for a container with a hanging tongue that is blow-molded in the main mold 30, the length under the lip cavity of the preform IA is 14, and the hanging tongue is 10. When the length of the thick part 3 to be formed is 2, the length I5 below the lip cavity and the length 9 of the thick part 3 are */L=172 to 1/20, preferably , 1/5 = -1/15 The third invention is a method for manufacturing a container with a hanging tongue piece to form a preformed product IA by forming a hanging tongue piece by injection molding. A preformed product IA made of synthetic resin is formed with a thick wall portion 3 for use, and this preformed product IA is subjected to a stretching process in which it is blown with a stretching temperature adjustment mold 18, and is suspended in a single molding mold 20. In the method for manufacturing a container with a hanging tongue piece, the intermediate molded product IB is formed by processing to form the utility bag 10, and the intermediate molded product IB is main blow molded in a main blow molding die 30. A method for manufacturing a container with a hanging tongue piece formed into a preformed product IA having a wall thickness of R−r=2 mm to 8 mm, where R is the average radius of the outside and r is the average radius of the inside. In each of the first to third inventions, after heating the preform IA from the inner surface, the stretching temperature adjustment mold 1
[Example] <Example 1> Figures 1 to 7 schematically show the molding process of one example of the present invention.

First, polypropylene homopolymer with MFR05g710nin was injected into the stretch blow molding machine ASB.
-250, when the injection molding temperature is 220°C and the injection cavity mold temperature Ti is 20°C, the relationship with the injection core building temperature Tc is Tc - Ti = 5°C.
As shown in FIG. 1, a preformed product IA having a mouth and neck part 2 and a thick walled part 3 for forming a hanging tongue was molded, and the length of the preformed product IAII under the lip cavity was 110 mm, the relational force with the length 9 of the thick portion 3, R/L=1. /10.

Sara & Mi Average thickness of the preformed product IA, that is,
Outer average radius R of preform IA - inner average radius r
The injection time for molding the preform IA was 7 mm.
sec, the cooling time was 4 sec, then the mouth and neck 2
The preform IA, which is held between neck molds 15, is stained as shown in FIG. A hanging tongue piece 1o is formed on the lower surface.

And, along with that, temperature 1 of the stretching temperature adjustment mold 18
40℃・Pre-blow air pressure is 5kg/cm2
Then, air is blown into the preform IA and stretched at a pre-blow stretching ratio of 1x in length and 1.2x in width to form a pre-blow-molded intermediate molded product IB as shown in FIG.

Next & Next Move the thick part 3 of this pre-blow molded intermediate molded product IB as shown in Fig. 4 Fixed mold 23 and movable mold 24
The tongue piece with a clamp is clamped with the mold 22, and the fixed mold 2
3 and the hole-forming protrusion 25.25 of the movable mold 24 are inserted into the hanging hole 11 of the hanging tongue piece 10.

Next, with the tongue piece clamp that holds the hanging tongue piece 1o, pull the mold 22 in the vertical direction and stretch it as shown in Figure 5! , second intermediate molded product I stretched in the longitudinal direction
C is surrounded by the main blow molding mold 30, and the main blow molding mold 30 is attached to the outer peripheral surface of the mold 22.
The lower edges of 1 are brought into close contact with each other, and air is blown into the second intermediate molded product IC.The second intermediate molded product 1C is laterally stretched and blow molded as shown in FIG. 6, and suspended as shown in FIG. A container with a tongue piece for hanging was manufactured.The stretching ratio of this molding was 1.6 times in length and 33 times in width, and the weight of the molded container was 40 g, with little thickness deviation, transparency and drop strength. This container is made of polypropylene resin and is of excellent quality.The container 1 is hung from the hanging hole 11 and is used for infusions and the like.

(Comparative Example 1) In this comparative example, MFR'0. 5g/10mLn polypropylene homopolymer injection stretch blow molding machine ASB
-250 molded to body diameter 90m Inner capacity 11
A round bottle with a hanging tongue of 00 mR was molded, and the average wall thickness of the bottomed preform was 434 mm (R-r above), and the length of the bottom preform (L) +
4 110mm (I2/L=1/10 above), injection temperature 220℃, injection cavity mold temperature 25℃ (Tc-Ti catfish -5℃ above), injection time 9s
,, The cooling time is 48cm pre-blowing and the stretching ratio is 1.
0x, horizontal 1. 2 times, pre-blow air pressure is 5kg/c
m! The stretching temperature adjustment mold temperature was 140°C, and the main blow stretching ratio was 16 times vertically and 331 times horizontally. , Got, Got Bottle I! , eh-
A polypropylene container with a weight of 40 g, low unevenness in thickness, and excellent transparency and filling strength.
1.36mm x 45mm x 1. The hanging tongue piece, which had a size of 2rr1m, became a bag-like shape and caused leakage (Comparative Example 2). / Homopolymer injection stretch blow molding machine A
A round bottle with a hanging tongue piece and a body diameter of 90 m and an internal capacity of 1100 rrl was molded using SB-250.

The average meat thickness of the preformed product with a bottom is 4 trim (
R-r), and the length of the preformed part of the temple bottom (III
l 10rnrn (said n/L-
= 1725)
c −Ti:=−−5t: ), rIlj If at injection
9 sec, cold 1.11 hours ii 4 sta:...
GRIG R1 - Stretching magnification 18 summer vertical 10 I, width 12 I, norizo 1゛ - air pressure! □ikg/c: m”
Stretching temperature adjustment mold temperature is 140t.
- The stretched instep was 16 times longer in length and 33 times wider in width.

The 1+ bottle obtained in Comparative Example 2 weighs 40 g, has little uneven thickness, and is a polyglovy container 17A that has excellent transparency and strength.
Ta.

However, the container has three hanging tongues.
6 mmX 13 rnrnX 1. The size of the hanging tongue piece is 2 nm, but it is small and has a problem.

41,,=te1. In the above embodiment, "C1 index"
John cavity mold moisture content Ti and temperature l: The junction core mold mixture Tc may be 0υ≦Ti≦20°C, preferably 1. ,, < +*, 5℃STi≦15℃, and if 0℃≦Tc・'r5≦30℃, then 5℃≦T e-T i <20℃ It is.

(I., In the above embodiment, the length 1 of the C1 preformed product IA under the lip groove and the length 9 of the thick part 3 formed on the hanging tongue 10 are Q /L.

has an af capacity of 1/2 to 1/20, preferably 1/2 to 1/20.
．． 15-1/15 is extremely effective.

Furthermore, it is difficult to form a bottle when R/L>1/2, and p/1. In the case of <: 1/20, it is difficult to form the hanging knife/barge tongue piece 10 of the required size.

Then, in the above embodiment, it is valid up to the average wall thickness of the prefii molded product IA, that is, the outer average radius R - the inner average half frame r12 mm = 8 m rn,
Preferably, 3mrra to 6rnrn is effective.

Moreover, R-r<, 2mrnT east The necessary retained heat could not be stored in the preformed product, making it difficult to form the hanging tongue piece 10. This causes more heat to be stored in the preform than is necessary.
It becomes difficult to shape the bottle.

Naturally, depending on the size of the hanging piece 10 required, the length 9 of the thick part 3 of the hanging tongue piece 10 and the average wall thickness R- of the preform mA rl, designed in conjunction.

Example: λ sleep If 9 is long ζ・l, then R-r can be /''),
If g is short, increase R-r by 1. There must be.

1. In the above-mentioned embodiment, before the P-molded product IA is blown with the stretching temperature control mold 18, the hanging tongue piece 10 is molded 1. However, the hanging tongue piece 10 can be molded after or simultaneously with the brie-blow.

In the main blow molding stage (it is also possible to press down the intermediate molded product IC with a stretching rod.

Then, it is also possible to blow hot gas or the like into the inside of the preformed product IA and heat the P-prepared product IA from the inside with A2, and then bristle it at a stretching temperature and matching amount of 18. be.

Further, in the above-mentioned Example IJ, the body 8 of the hanging container is shaped and sealed into a cylindrical shape (this body 8 may be formed in a uniform shape).

Then, when forming the body 8 of the container into a flat shape, the thick part 3 of the intermediate molded product IB is sandwiched and the hanging tongue piece 1 is formed.
Molding 0 1 - With tongue piece clamping, the mold 22 can be pulled out of the main blow molding mold 30 and the bottom of the intermediate molded product IB can be pressed with the lower edge of the main blow molding mold 30. It is possible.

It is also possible not to provide the hanging hole 11.

〔Effect of the invention〕

The present invention provides a preformed product IA with a thick wall portion 3 for forming a hanging tongue, and forms a hanging tongue lO during pre-blow molding (at the same time as pre-blowing, or just before pre-blowing, or before pre-blowing. Since the hanging tongue piece 10 is molded at a temperature that is not limited by the main blow molding temperature,
Can be molded.

Then, the injection cavity mold temperature, the injection core mold temperature, the length of the preform IA and its thick wall portion 3, and the wall thickness of the preform IA were specified to values convenient for molding, so it is necessary. A container in which the hanging tongue piece 10 is formed can be easily formed.

In addition, a container with a hanging tongue piece can be manufactured without increasing the number of molding steps.

[Brief explanation of the drawing]

Figures 1 to 7 are diagrams showing the outline of the molding process in one embodiment of the present invention, where Figure 1 shows the cross section of the preform. The cross-sections showing the state are as follows: Fig. 3 is a cross-section showing the state after pre-blow molding; Fig. 4 is a cross-section showing the tongue formed; Fig. 5 is a cross-section showing the tongue being stretched in the longitudinal direction. FIG. 6 is a cross-sectional view showing the blow-molded state. FIG. 7 is a front view of the manufactured container with a hanging tongue piece. 1 A ・ I B ・ 10 ・ 18 ・ 22 ・ 30 ・ Injection-molded preform & intermediate molding & 3... tongue piece for hanging the thick part, stretching temperature adjustment mold, tongue piece clamping mold , Main blow molding - Fig. 2 Fig. 5 Fig. 6 Fig. 7

Claims (4)

[Claims] (1) Forming a preformed product made of synthetic resin with a thick wall part for forming a hanging tongue piece by injection molding, and stretching the preformed product by pre-blowing with a stretching temperature control mold;
In a method for producing a container with a hanging tongue, the process involves forming a hanging tongue using a tongue molding mold to form an intermediate molded product, and main blow molding the intermediate molded product using a main blow molding mold. , where the injection core mold cooling temperature is Tc and the injection cavity mold cooling temperature is Ti, the injection core mold cooling temperature Tc and the injection cavity mold cooling temperature are Ti, 0°C≦
A method for manufacturing a container with a hanging tongue piece, which comprises forming a preform by setting the temperature to Ti≦20°C and 0°C≦Tc-Ti≦30°C. (2) Forming a preformed product made of synthetic resin with a thick wall part for forming a hanging tongue by injection molding, and stretching the preformed product by pre-blowing with a stretching temperature control mold;
In a method for producing a container with a hanging tongue, the process involves forming a hanging tongue using a tongue molding mold to form an intermediate molded product, and main blow molding the intermediate molded product using a main blow molding mold. , When the length under the lip cavity of the preform is L, and the length of the thick part formed on the hanging tongue is l,
A container with a hanging tongue piece in which the length L under the lip cavity and the length l of the thick wall portion are formed to be l/L=1/2 to 1/20 to form a preformed product. manufacturing method. (3) Forming a preformed product made of synthetic resin with a thick wall part for forming a hanging tongue by injection molding, and stretching the preformed product by pre-blowing with a stretching temperature control mold;
In a method for producing a container with a hanging tongue, the process involves forming a hanging tongue using a tongue molding mold to form an intermediate molded product, and main blow molding the intermediate molded product using a main blow molding mold. , A method for manufacturing a container with a hanging tongue, which is formed into a preformed product having a wall thickness of R−r=2 mm to 8 mm, where R is the average radius on the outside of the preform and r is the average radius on the inside. (4) The method for manufacturing a container with a hanging tongue according to any one of claims 1 to 3, wherein the preform is heated from the inner surface and then pre-blown in a stretching temperature control mold.