JPS63189225A - Manufacture of heat-resistance multi-layer container and blow molding equipment - Google Patents

Abstract

PURPOSE:To prevent an item from whitening and eliminate generation of ununiformed section by a method wherein a multi-layer parison is injection-molded under the state that the surface temperature of a male mold is held to be higher than that of a female mold in order to make the temperature of the inside of the parison higher than that of its outside and, under that state, hot and pressurized blow air is blown in the parison for stretching blow molding. CONSTITUTION:After being quenched and solidified in a parison injection mold, wherein the surface temperature of the male mold is held higher than that of its female mold, a parison is released from the mold for temperature controlling. At this time, the temperatures of the parison outside region 5 of a polyethylene terephthalate layer and of the region 7 positioning inside the region 5 are controlled to be near the proper temperature for orienting polyethylene terephthalate. On the other hand, the temperatures of a heat-resistant resin layer 6 and of a terephthalate layer 4 at the inside of the parison are controlled to be near the proper temperature for orienting the heat-resistant resin layer. After the temperature control, the parison is shifted to a blow molding equipment and stretchingly blow-molded by blowing hot pressurized blow air in the parison at or after adiabatic expansion, resulting in allowing to perform favorably a stretch blow-molding with neither whitening nor the generation of ununiformed section.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a multilayer stretch blow container and a blow molding apparatus.

[Conventional technology]

In recent years, heat-resistant resins such as U polymer (manufactured by Unitika,
Polyethylene terephthalate (PKT') is a blend polymer of polyarylate and polyethylene terephthalate).
By co-injecting with J and then stretch blow molding,
Techniques for obtaining heat-resistant bottles are being developed.

In addition, instead of the conventional method of stretch blow molding using blow air at room temperature, blow molding is performed by closing the blow molding mold components surrounding the parison and blowing air into the blow pipe before adiabatic expansion. Disclosed is a blow molding method in which heated and pressurized blow air whose temperature is in the range of about 100-400°C (38-204°C) before passing through a valve that controls the supply of parison is injected into the parison and biaxially stretched. (Refer to Japanese Patent Publication No. 61-58288).

[Problem that the invention seeks to solve]

However, in order to impart heat resistance to PET,
There are also the following problems with co-injecting heat-resistant resin and stretch blow molding.

For example, polymers that can be used as heat-resistant resins and PET have different stretching temperatures.

Therefore, if U polymer and PET, which have different suitable stretching temperatures, are co-injected, the multilayer parison is heated to the suitable stretching temperature of PET, and then stretch-blow molded using cold blow air according to the conventional method, in the stretch-blowing process. , a so-called whitening phenomenon occurs in the center of the bottle body. - 10,000, (2) By heating the multilayer parison at a high temperature to a temperature suitable for stretching the polymer and then stretch-blow molding, whitening can be eliminated, but the PET becomes noticeably thinner during stretching. Crystallization impairs transparency.

In this manner, the manufacturing process for obtaining a stretch-blown bottle by stretch-blowing a multilayer parison of heat-resistant polymer and PET is carried out under strict parison temperature restrictions.

In addition, in the multi-piece manufacturing process for stretch-blown bottles, especially when manufacturing stretch-blown bottles using the so-called hot parison method, which involves a series of continuous steps of parison injection molding, temperature control, and stretch-blow molding. It is difficult to co-inject a large number of parisons under uniform conditions and to control their temperature uniformly.

In addition, instead of the conventional method of stretch blow molding using blow air at room temperature, when stretch blow molding is performed using heated and pressurized blow air described in Japanese Patent Publication No. 61-58288, the temperature of the blow air due to adiabatic expansion cooling is The air must be heated to a higher temperature to avoid the drop. Therefore, not only is energy inefficient, but the equipment is It's going to be a big deal.

[Means for solving problems]

As a result of research to solve the above-mentioned difficulties in creating multi-layer bottles, the present inventors have found that they have a heat-resistant resin coating as an intermediate layer,
In a method for producing a heat-resistant multilayer container, the method for producing a heat-resistant multilayer container includes forming a multilayer parison in which the heat-resistant resin layer is biased toward the inside of the molded body, and stretch-blow-molding the multilayer parison. The multilayer parison is co-injection molded while the temperature is maintained higher than the surface temperature of the female mold, the temperature is adjusted so that the inside of the parison is higher than the outside, and then heated and pressurized blow air is applied to the parison. It has been found that, by a method of stretch-blow molding by blowing into the inside, stretch-blow molding can be performed without causing whitening and uneven thickness.

However, the method described in the above-mentioned publication for supplying heated and pressurized blow air into the parison requires large-scale equipment and results in poor energy utilization efficiency.

As a result of research to eliminate this drawback, it was found that after the valve that controls the injection of blow air into the parison, that is, when blow air is injected into the blow mandrel through the valve, or after the injection, heating is performed, and then the parison is heated. The inventors have discovered that if a method of blowing into the interior of the container is used, stretch blow molding can be performed without requiring large-scale equipment and using energy effectively.Based on this knowledge, the first invention relating to a method for manufacturing a heat-resistant multilayer container has been created. It is completed.

That is, the first invention is ``a heat-resistant method for forming a multilayer parison having a heat-resistant resin layer as an intermediate layer and in which the heat-resistant resin layer is biased toward the inside of the molded body, and stretch-blow-molding the multilayer parison. In a method for manufacturing a multilayer container, the multilayer parison is co-injection molded while the surface temperature of the male mold of an injection mold for molding the parison is maintained higher than the surface temperature of the female mold, and then the inside of the parison is molded on the outside. A method for producing a heat-resistant multilayer container, which comprises adjusting the temperature to a higher temperature than the parison, and then blowing heated and pressurized blow air into the parison during or after adiabatic expansion to perform stretch blow molding. That is.

Furthermore, as a result of research regarding the blow molding equipment that implements the above manufacturing method, it has been found that if the heating of the pressurized blow air is performed using a spiral heater, the pressurized blow air that has been adiabatically expanded and cooled can be efficiently heated, making it possible to increase the size of the equipment. By measuring the temperature of the blow mandrel and the high pressure air, and controlling the heater based on the temperature measurement results, the heated pressurized blow air can be heated under the same conditions. Based on this knowledge, we completed the second discovery related to blow molding equipment.

That is, the second invention provides a blow molding mold, a cylindrical blow mandrel connected to the blow mold, and an upper part of the blow mandrel (7): provided to surround the upper part of the blow mandrel. A slide sleeve with an airtight for sealing the open end of the blow block and blow mandrel and supporting the stretch rod, and a stretched lobe slide sleeve for supporting the stretch rod provided near the lower part of the interior of the blow mandrel. In a blow molding device consisting of a slide sleeve with airtight and a stretched rod positioned at the center of the blow mandrel by a slide sleeve with an air tight and a stretched lobe slide sleeve, a spiral heater is built in the blow mandrel.
The blow mandrel has a temperature sensor for temperature control and a temperature sensor for high pressure air temperature measurement, and a cylindrical stretching rod cover sleeve is provided between the stretching rod and the heater. A passage is provided through the blow block for supplying high pressure air between the blow mandrel and the stretching rod cover sleeve, and a high pressure air injection pipe is connected to the blow block through a joint for the high pressure air injection pipe so as to be connected to the passage. A blow molding device characterized in that a device for supplying high pressure air is connected to the high pressure air injection pipe via a solenoid valve. ” is the gist.

Hereinafter, the present invention will be explained in detail.

First, as shown in the first figure, it consists of a heat-resistant resin layer (1) as an intermediate layer and a polyethylene terephthalate layer (2) as a main resin, and is heat-resistant! A multilayer parison is molded in which the gin layer (2) is offset to the inside of the molded body.

Here, as the heat-resistant resin layer, U polymer (manufactured by Unitika, a blend polymer of polyarylate and polyethylene terephthalate), polycarbonate, a blend polymer of polycarbonate and polyethylene terephthalate, a blend polymer of polyarylate, polycarbonate, and polyethylene terephthalate, etc. can be applied. .

Next, the polyethylene terephthalate resin used in the present invention is terephthalic acid or its ester-forming derivatives (for example, lower alkyl esters, phenyl esters, etc.)
ethylene glycol or its ester-forming derivative (
For example, monocarboxylic acid ester ethylene oxide, etc.)
It is a polyester obtained by polymerizing about 20
Other dicarboxylic acid or glycol moieties of the mole may be copolymerized. In addition, the polyester is trimethylolpropane, pendant erythritol.
Tri-meritic acid, Tri-meritic acid
A polyfunctional compound such as mesic acid may be incorporated in a molar value of less than 2. Other dicarboxylic acid components used as penultimate Kyotosei ingredients include phthalic acid, isophthalic acid, naphthalene dicarboxylic acid, diphenyl dicarboxylic acids, aromatic dicarboxylic acids such as siethane dicarboxylic acids, adipic acid, and cepatic acid. , azelaic acid, decanedicarboxylic acid, cyclohexanedicarboxylic acid, and the like include aliphatic group dicarboxylic acids.

Other glycol components used as other copolymerization components include aliphatic or fat-like glycols such as trimethylene glycol, propylene glycol, tetramethylene glycol, neopentyl glycol, hexamethylene glycol, dodecamethylene glycol, and cyclohexane dimetatool. Examples include group glycols, bisphenols, hydroquinone, 2,2-bis(4-β-hydroxyethoxyphenyl)propane, and other aromatic diols.

It is also possible to use other oxyacids such as β-hydroxyethoxybenzoic acid and α-oxycaproic acid. It is also possible to use lower alkyl esters of these oxyacids and other ester-forming derivatives.

Next, the mold is rapidly cooled and solidified in a parison injection mold in which the surface temperature of the male mold is maintained higher than that of the female mold, and then molded and temperature controlled. At this time, as shown in the second figure, the temperature of the outer region (5) of the polyethylene terephthalate IH parison and the region (7) located inside the parison is adjusted to around the suitable stretching temperature of polyethylene terephthalate, that is, 95 to 120"C. ,
- 10,000, heat resistant resin RL! The temperature of the polyethylene terephthalate layer (4) inside the ite+ and parison is adjusted to around the stretching permeability temperature of the heat-resistant resin layer, for example, 120 to 165°C if the heat-resistant resin layer is made of σ polymer 8400.

The temperature is also adjusted so that the outside of the parison is relatively colder than the inside.

As a method of cooling the parison in this way, the outer wall of the parison is cooled by contact cooling with a temperature control type, or the outer wall of the parison is cooled in a temperature control pot that is kept cooled at a relatively lower temperature than the parison with cooling air, or This can be done by heating the inside of the parison with a heater, heating the inside of the parison by circulating heated air, or a combination of the above methods.

FIG. 3 shows an example of a parison temperature control device that can be applied to the present invention. In the figure, 50 is a temperature control type, 51, 52, 53, and 54 are divided temperature control zones, and 55 is a temperature control medium flow path. , 56 is a rod heater, 57 is a heater holder, 58 is a heating core, 59 is a fixed bush on the heater holder, 60 is a fixed bush on the heater holder, 61 is a heating piece, 62 is a fixed block, 63 is a heater fixing block, 64 is a fixed bush on the heater holder. 65 is a pressurized air flow pipe, 66 is a processing air control valve, 67 is a first zone temperature controller, 68 is a second zone temperature controller, 69 is a third zone temperature controller, and 70 is! ! 84 zone temperature controller, 71 is a heating medium flow tube, and 72 is an airtight circle j-.

Pressurized air is blown into the inside of the parison (3) heated above the softening temperature through the pressurized air flow pipe 9, and the outside of the parison (3) is brought into contact with the inner surface of the temperature control mold (3) divided into four zones.

Then, the inner surface of the parison is relatively heated by the rod heater and the heating piece [F]υ attached thereto, and the outer surface l of the parison is relatively cooled.

After controlling the temperature as described above, the parison is transferred to a blow molding device, and during adiabatic expansion or after 1: blowing heated, heated and pressurized blow air into the parison to perform stretch blow molding. Stretch blow molding can be performed satisfactorily without causing uneven thickness.

Therefore, it is desirable that the temperature of the heated and pressurized blow air is 30°C or higher and lower than the temperature suitable for stretching the heat-resistant resin, for example, when σ polymer is used as the heat-resistant resin, the temperature is 120°C or lower. Yes.

In addition, the optimum temperature of the heated and pressurized blow air depends on the temperature of the temperature-controlled parison, but is between 60 and 110 degrees centigrade, and the best stability of the stretch blowing operation can be obtained within this temperature range. .

The mold of the blow molding apparatus is heated to 90 to 110'C, but heating is not necessary when heat treatment is performed in three steps separate from blow molding.

In addition, heat the mold of the blow molding equipment to 90-110°C and continue heat treatment in the same mold, or set the mold temperature to 70°C or more and 20°C or more lower than the melting point of the base. The temperature is adjusted to the desired temperature, and while the molded product is held under pressure in the mold, infrared rays are radiated from a rod-shaped heater, and high-temperature air is released and circulated within the molded product to heat the molded product from within. A method of heating the molded product to a heat treatment temperature that is at least 10°C higher than the temperature, then moving the rod-shaped heater to the outside of the molded product to stop internal heating, allowing the molded product to cool to near the base temperature, and then releasing it from the mold. 1: Can also lean.

FIG. 4 is a diagram T0 showing the blow molding apparatus of the present invention.
10 is a ship cavity, 11.12 is a blow heat treatment type, 13 is a stretching rod, 14 is a stretching rod tip, 15 is a blow block, 16 is a blow mandrel, 17 is a stretching rod slide sleeve, 18 is a slide sleeve with airtight, 19 is a Stretched rod cover sleeve, 20 is a spiral heater, 21 is a presser plate, 22 is a temperature sensor for controlling the temperature of a brochure drill, 123 is a temperature sensor for high pressure air temperature measurement, 24 is a high pressure air piping joint, 25 is an airtight spiral heater The joint 26 indicates a high pressure air open end opening/closing solenoid valve.

A spiral heater (1) is built in and in contact with the inner peripheral surface of the blow mandrel αQ.

The reason why the spiral heater (4) is built in so as to be in contact with the inner peripheral surface of the blow mandrel qf3 is to radiate excess heat to the blow mandrel (6) and prevent the heater from overheating. be.

Further, the blow block (to) is provided with a cooling water passage, and is configured to be cooled as necessary.

As spiral heater (1), Sσ8316 split sheath heater 1.6+mφ400W, 200V1320
0IIIm into a spiral or 2.4■φ
, 700W, 1200V, and 4200V connected in a spiral can be applied.

As the stretched rod cover sleeve α9, one with 8σ day 616 cracks is applied. This stretched rod cover sleeve α
9 is spaced apart from the driving stretching rod (2) to keep the blow air clean and to stabilize the flow of the blow air.

The stretched rod slide sleeve can be made of heat-resistant engineering plastics, such as polyamide-imide (T1-5000.1000 manufactured by Toshi), polyimide (
DuPOnt%, Veaple), aromatic polyester (Sumitomo Chemical, Econol 8600, E+1000)
, PII:l! ! etc. can be applied. Especially those made of Econol contain FTFI in the resin! It has excellent wear resistance and sliding properties.

It is undesirable to construct the stretched Robust slide sleeve σ7)o8 with metal such as yellow iron because of the problem of shavings and the like.

In order to achieve high-pressure airtightness and to easily incorporate and remove the spiral heater, the blow mandrel has a two-sided structure as shown in Figure 5.

In addition, in the figure, 81 is the high pressure air distribution! 82 is a heater connection hole, and 83 is an O-ring.

FIG. 6 shows a fixing device for the heater lead wires.

Sleeve with steps for fixing from the outside (271
The lead wire (to) is processed and fixed to the spikele heater airtight joint (c) with the O ring (to).

Figure 147 shows the flow of blow air.

38 is a vent air valve, 30 is an accumulator, 31 is a cooler dryer, 32 is a compressor, 24.65.34.35 is an air inflow pipe, 66.5
7 is the air vent pipe, 39 is the silencer T.

The blow air is pressurized by a compressor 6, cooled and dehumidified by a cooler dryer O1), and stored in an accumulator (2).

The solenoid valve ■ is 1 per stretch blow cycle.
After stretching and blowing, it is closed before the air extraction pulp gate is opened.

The opening/closing operation of this electromagnetic valve (c) is of the blow heat treatment type 11.
,12. is closed, the V-can is opened at fixed time intervals during the lowering of the stretching rod, either at the same time as the stretching rod 13 is lowered or after an appropriate time has elapsed via a delay timer, and closed after the blow heat treatment time set by the timer. This is done through control.

Bloeff temperature is determined by the accumulator (7), the accumulator radar (to), the electromagnetic valve (to), and the dark air inlet pipe (to
2), the air inflow pipe between the solenoid valve and the blow block (to) is lower than the temperature at the accumulator q1 and the air inflow f(2) due to adiabatic expansion when passing through the blow block (to). ! -4, and is heated in the process of passing through the blow mandrel μs.

The air condition of the operation FvJ (before opening) of the electromagnetic valve (c) is the accumulator (to), and the accumulator - ω and w.
The air inflow pipe (to) between the electromagnetic pulp (4) and the blow block (to) is at high pressure and low temperature (room temperature), and the air inflow pipe (to) between the electromagnetic pulp (4) and the blow block (to), the blow block (to), and the blow mandrel Oe are at high pressure and low temperature (room temperature). At atmospheric pressure, the air remaining inside the blow mandrel is at a high temperature, and the air remaining in the air inlet pipe leading to the blow block and the air remaining in the blow block is cooled by the cooling water flowing inside the blow block. is maintained at a low temperature.

When the electromagnetic pulp (2θ) is activated (opened), high-pressure air cooled to below room temperature is supplied to the air inlet pipe Q4, and while the pressure decreases, it passes through the blow block (to) and the blow mandrel qQ to the parison (3). ) is caused to flow into ζ.

The air pressure in the area between the air inflow 1rCJ4) and the inside of the parison +33 rises with the increase in the amount of air inflow,
When the parison is expanded and reaches the point where it touches the mold surface in the cavity, the pressure becomes the same as the pressure in the accumulator.

[For production]

First of all, ¥ of this invention! The effect of the manufacturing method will be explained.

In the stretch-blowing process, whitening is prevented by keeping the heat-resistant resin layer at a temperature suitable for stretching using baby-heated pressurized blow air, and at the same time, by keeping the side that contacts the mold at a low temperature, uneven thickness can be prevented. Prevented.

Next, the operation of the blow molding apparatus of the present invention will be explained.

The spiral heater in the blow mandrel performs adiabatic expansion cooling and then heats the air. This spiral heater exists over a suitable distance along the flow path of the blow air, and heats the blow air in a cumulative manner.

In addition, a temperature sensor for blow mandrel temperature control and a temperature sensor for high pressure air temperature measurement detect the temperature of the blow mandrel and high pressure air.

At the end of the λ1 blow molding process, the air inside the parison, the -1 section, and the blow mandrel reaches high pressure, and at the same time the temperature rises due to the adiabatic compression effect, and cooling by air passage stops, causing the heater to overheat. In order to prevent this from happening, and to keep the temperature inside the blow mandrel constant before the electromagnetic pulp (2b) is released, the temperature sensor for blow mandrel temperature control and the temperature sensor for high pressure air temperature measurement are used to measure tnn measurement 2. The heater is controlled and the blow mandrel is cooled as necessary based on the measured data.

〔Example〕

Polyethylene terephthalate (Mitsui Pl!ITIII,
A multilayer parison with a weight ratio of 90% polyethylene terephthalate and 10 parts σ polymer was injection molded using U polymer (manufactured by Unitika, grade σ8400). P in the center of the parison body
E! The valley-wall thickness of T/U polymer/P11iT is 7,941/Q, 24 ml/0.
The total wall thickness was 881 m and 4.111 m.

In the parison injection molding and cooling process, the parison outer mold (capity mold) is cooled with 8"C cooling water and the parison inner mold (core mold) is cooled with 15°C cooling water with a temperature difference, and molded. The inside temperature of the parison is higher than the outside temperature (
I made it so.

Injection time (injection and pressure holding time), cooling time (
The total time (hereinafter referred to as injection cooling time) is the time for the parison to remain in the mold and cool after injection is completed.
was changed from 19.3 seconds to 22 seconds, the cooling conditions of the parison within the injection mold were changed, and the temperature of the parison was changed.

In addition, after forming and cooling the parison, a temperature control process was performed to temporarily adjust the temperature and degree of the parison before the stretching and blowing process.
This condition setting was kept constant, and the sample was kept in a cylindrical pot at a temperature of 95°C for 20 seconds.

For stretch blow molding, a spiral sheath heater (strs316 sheath heater 1
The heating and pressurizing blow air was blown using a blow air heating blowing device equipped with a 5 gmφ, 400 W, 200 V).

The temperature was measured with a /'lit pair embedded on the outside of the blow mandrel, and the voltage applied to the sheath heater was changed to change the amount of heat generated, and the temperature of the high-pressure blow air blown was changed.

First, the injection cooling time was 193 seconds, 19.5 seconds, and 20 seconds.
．． When the time was 0 seconds, stretch blow molding was performed without using hot blow air and without whitening of the U polymer due to cold blow air. However, at 195 seconds, the parison is still left in a high temperature state, so polyethylene terephthalate begins to crystallize, causing cloudiness in the bottle and resulting in a bottle with poor transparency and large uneven wall thickness. Oops.

Next, when the injection cooling time was extended to 2Q and 5 seconds and stretch blow molding was carried out in the same manner as above, whitening of the σ polymer occurred.

Next, the sheath heater was energized and the voltage was gradually increased. At the same time, the temperature of the blow mandrel was measured. Stretch blow molding was then carried out using blow air heated by a sheath heater at various temperatures, and the heating temperature by the sheath heater was raised to a high temperature until no whitening occurred.

Whitening completely stopped occurring from 55°C.

Furthermore, similar conditions were changed such that the injection cooling time was 2tO seconds and 21
．． When extended to 5 seconds and 22.0 seconds, it was 76 respectively.
"C,86-C,1o 3"C:c Whitening was resolved.

The above experimental results are shown in FIG.

Whitening occurs over a fairly large area, and △ indicates that even a very small amount of whitening in the form of cloves or dots is visible to the naked eye. In addition, ◯ indicates that no whitening occurred at all.

〔Effect of the invention〕

(When stretching and blow molding a multilayer container made of 11 polyethylene terephthalate and a heat-resistant resin, C is used to prevent whitening; conventionally, the appropriate stretching temperature for heat-resistant resins such as U polymers is C. Temperature control temperature for Niparison) polyethylene terephthalate is heated to a higher temperature than the appropriate temperature,
Clouding was likely to occur due to crystallization of polyethylene terephthalate. Particularly when the injection cooling time is on the order of 19 seconds, blockage is likely to occur. According to the present invention, the injection cooling of the parison can be performed for 20 seconds or more, so that it is possible to eliminate the fogging of polyethylene terephthalate and obtain a bottle with excellent clarity. e-kill.

(2) According to the present invention, whitening and distortion of the σ polymer can be prevented and the multilayer container'? ! f Grade U345 contains a large amount of polyarylate with high heat resistance because it can be stretch blow molded.
0 (45% polyarylate) as a heat-resistant resin, a multilayer container with excellent heat resistance can be obtained.

(3) Invention C: According to the present invention, the stretching temperature can be brought close to the appropriate stretching temperature of polyethylene terephthalate, so that the occurrence of uneven thickness of polyethylene terephthalate can be reduced. Therefore, there is no need to use expensive PET resin with a high IV value, and costs can be reduced.

(4) When molding a large number of parisons, it is not possible to mold them under uniform injection conditions, and therefore the quality and temperature control of the parisons to be stretched and blown are not uniform. However, the difference in stretch blow suitability caused by the difference in parison temperature between cavities can be easily resolved by individually controlling the hot blow air temperature. Therefore, the co-injection conditions and temperature control conditions for the parison can be widened.

(5) Since the blow mandrel is traditionally equipped with a spiral heater, it is possible to quickly heat the high-pressure air as it passes through.

(6) At the end of the blowing process, the air inside the bottle reaches high pressure, and at the same time as the molding is completed, the temperature rises due to the adiabatic compression effect. - The sheath heater continues to be heated even after the blow air stops passing, and the sheath heater itself becomes muscle warm and stores heat. By opening the T4 magnetic valve at the timing when this heat storage temperature reaches its maximum and performing the next blowing process, heated air can be obtained even more efficiently.

In addition, since the heating heater is located at the position where the adiabatic swelling occurs, unnecessary parts of the device are not heated, and the blow air whose temperature has been lowered is directly heated. It is preferable for mechanical operation because
The efficiency of energy use is also impressive.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the parison used in the present invention, Figure 2 is a cross-sectional view of the parison used in the present invention.
The cause is an enlarged cross-sectional view of the parison body shown in Figure 1, Figure 3 is a cross-sectional view of the temperature control device, Figure @4 is a cross-sectional view of the blow molding apparatus of the present invention, Figure 5 is an exploded perspective view of the blow mandrel, FIG. 6 is an explanatory diagram of the fixed bag layer of the lead fermentation of the heater, FIG. 7 is a flow diagram of hot blow air, and FIG. 8 is a graph showing the occurrence of whitening. 3・・・・・・・・・・・・・・・Python・
・・・・・・・・・・・・・・・Heat-resistant resin) #!
2・・・・・・・・・・・・・・・・・・Polyethylene terephthalate layer 10・・・・・・・・・・・・・・・Lip cavity 11.12・・・・・・・・・・・Blow heat treatment type 13・・
・・・・・・・・・・・・Stretch rod 14・・・・・・
・・・・・・・・・Extension rod tip 15・・・・・・
・・・・・・・・・Blow block 16・・・・・・・
・・・・・・・・・Bro Mandrel 17・・・・・・
・・・・・・Stretched rod slide sleeve 18...
.........Slide sleeve with airtight 19......Extension rod cover sleeve 20... ...Spiral heater 21...Press plate 22--Blow mandrel temperature control temperature sensor 25...・・・・・・・・・・・・Temperature sensor for high pressure air temperature measurement 24・・・・・・・・・・・・High pressure air piping joint 25・・・・・・・・・・・・・・・・・・Spiral heater air @ fitting 26 ・・・・・・・・・・・・・・・High pressure air open end opening/closing solenoid valve Patent applicant Atsushi Ko Nishi, Patent attorney, Dai Nippon Printing Co., Ltd. Beauty Figure 1 Figure 2 Figure 3 Figure 5 Figure 6 #! P7 figure 8rl! J

Claims (2)

[Claims] (1) A method for manufacturing a heat-resistant multilayer container, comprising forming a multilayer parison having a heat-resistant resin layer as an intermediate layer and having the heat-resistant resin layer biased toward the inside of the molded body, and stretch-blow molding the multilayer parison. In this step, the multilayer parison is co-injection molded with the surface temperature of the male die of the injection mold for parison molding being maintained higher than the surface temperature of the female die, and then the inside of the parison is hotter than the outside. Adjust the temperature to
A method for producing a heat-resistant multilayer container, which comprises stretching and blow-molding the parison by blowing heated and pressurized blow air into the parison during or after the adiabatic expansion. (2) A blow molding mold, a cylindrical blow mandrel connected to the blow molding mold, a blow block provided above the blow mandrel so as to surround the upper part of the mandrel, and an open end of the blow mandrel. A slide sleeve with an airtight for sealing the area and supporting the stretch rod, a stretch rod slide sleeve for supporting the stretch rod provided near the lower part inside the blow mandrel, a slide sleeve with air tight, and a stretch rod slide sleeve In a blow molding device consisting of a stretching rod positioned at the center of a blow mandrel, a spiral heater is built in the blow mandrel, and a temperature sensor for controlling the temperature of the blow mandrel and a temperature sensor for measuring high pressure air temperature are installed. A cylindrical stretching rod cover sleeve is provided between the stretching rod and the heater, and high pressure air is supplied between the blowing block and the blowing mandrel by passing through them. A high-pressure air injection pipe is connected to the blow block via a high-pressure air injection pipe joint so as to be connected to the passage, and high-pressure air is supplied to the high-pressure air injection pipe via a solenoid valve. A blow molding device characterized in that the device is connected