Separable laminated container

Abstract: A separable laminated container (A) of the present invention comprises an outer layer (111) made of synthetic resin, having an air suction hole (114), and provided with a mark (115) composed of projections or indents which are formed in the outer surface thereof during molding into a container configuration; and an inner layer (112) made of synthetic resin and separably laminated on the inside of the outer layer, the inner layer having a portion previously separated from the outer layer just around the air suction hole.

Description: Technical Field The present invention relates to a separable laminated container, of which an inner layer is separated from an outer layer and shrinks according to the decrease of the liquid content, and the related arts. Background Related Art A separable laminated container is made up of an outer layer and an inner layer which are made of synthetic resin. The inner layer is separably laminated to the outer layer. The separable laminated container is normally used in the sealed state with a pump installed to a neck portion thereof. As the liquid content is poured out by the pump, the inner layer is separated from the outer layer and shrinks according to the decrease of the liquid content. In order to smoothly conduct the shrinkage of the inner layer, the outer layer is provided with an air suction hole. There is a separable laminated container in which an outer layer and an inner layer are partially bonded as disclosed in Japanese Published Unexamined Patent Application No. H04-339759, Japanese Published Unexamined Patent Application No. H05-310265, or the like. The position where the outer layer and the inner layer are bonded has been considered variously. For example, the bonded portion is provided linearly along the longitudinal direction of the separable laminated container. By the way, the separable laminated container is normally made in a method as described below. First, a laminated parison or laminated preform (hereinafter, referred to as the laminated parison) having a laminated structure corresponding to the separable laminated container to be manufactured is molded by extrusion molding. During this molding, a bonded area extending the axial direction is provided in a predetermined position in such a manner as to allow the separation between the outer layer and the inner layer besides the bonded area. Then, the laminated parison is set in the mold and molded into a desired bottle-like configuration by blow molding in such a manner as to have an air suction hole in the outer layer. For making sure to introduce air through the air suction hole, the position of the air suction hole should be shifted from the bonded area. When the diameter of the air suction hole is equal to or smaller than the width of the bonded area, overlap between the air suction hole and the bonded area results the blockage of the air suction hole so that air can not be introduced into a space the outer layer and the inner layer and the inner layer can not shrink. However, since there is no mark indicating the position of the bonded area in the conventional separable laminated container, the air suction hole is sometimes formed to be overlapped with the bonded area. Another one of the objects of the present invention is to provide a separable laminated container allowing an air suction hole to be positively positioned at a portion shifted from the bonded area. By the way, to smoothly separate the inner layer from the outer layer according to the decrease of the liquid content in the separable laminated container, pre-separation is made before filling the container with the liquid content, for example, as disclosed in Japanese Published Unexamined Patent Application No. 06-345069. The conventional pre-separation is made by blowing air through the air suction hole of the separable laminated container to separate the inner layer from the outer layer, then blowing air into the container through the neck, and deaerating a space between the inner layer and the outer layer through the air suction hole so that the inner layer is returned in such a manner as to cling to the inner surface of the outer layer. However, in the conventional separable laminated container, the inner layer is made of synthetic resin having a melting point higher than that of the material of the outer layer and flexural modules between 10,000 kg/cm 2 and 50,000 kg/cm 2 (measured by ASTM D790 method of measurement) so as to have good distortion resistance, that is, higher elasticity. Therefore, to smoothly separate the inner layer according to the decrease of the liquid content, the inner layer must be completely separated over the entire laminated area during the pre-separation. For that, a predetermined amount of air according to the dimensions of the container should be blown between the layers. Therefore, there is a problem that the separation can not be completed overall when the control of blowing is mistook. Further, a control unit is necessary for controlling the amount of air, thereby complicating the device. As is well known, since the outer layer and the inner layer should be made of resin having lower bond properties for the purpose of separating the inner layer from the outer layer, the inner layer and the outer layer are not completely bonded to each other at a pinch-off portion formed at a bottom of the blow-molded container. This causes a cracking of the pinch-off portion and a slit between the layers due to a separation, thereby causing a sealing defect. Under the circumstances mentioned above, the synthetic resin having good distortion resistance, that is, higher elasticity as described above further facilitates the defect. There is a problem that the container entraps moisture between the inner layer and outer layer from the sealing defect when the container is used in a damp area. In the conventional pre-separation, the inner layer is separated from the outer layer and then returned in the original position. At this point, the inner layer is compressed against the outer layer, thereby making the separability between the layers low. Another one of the objects of the present invention is to provide a separable laminated container in which an inner layer can be easily separated from an outer layer, and further another one of the objects is to provide a method and device of pre-separation which is easily completed by partly separating the inner layer with a small amount of air. Since, once separated from the outer layer, the inner layer is returned in such a manner as to cling to the inner surface of the outer layer in the conventional pre-separation, the level to which the pre-separation is finished does not appear externally so that it is difficult to inspect the level. Another one of the objects of the present invention is to provide a separable laminated container which allowing the easy inspection of the level to which the pre-separation is finished. In case of a container for liquid, since the ratio of the amount of liquid content to the capacity of the container is generally constant, larger capacity of the container makes an upper space after filled with the liquid content larger so that the level is sometimes lowered to a lower portion of a shoulder or near an upper end of the drum portion of the container. Disclosure of the Invention The present invention is directed towards a separable laminated container comprising: (a) an outer layer made of synthetic resin, having an air suction hole, and provided with a mark composed of projections or indents which are formed in the outer surface thereof during molding into a container configuration; and (b) an inner layer made of synthetic resin, separably laminated on the inside of the outer layer, and partly bonded with the outer layer by a bonded area, the bonded area disposed apart from the air suction hole. In the separable laminated container the mark is formed during molding into a container configuration so that the positional relation between the bonded area and the mark is defined. Therefore, the mark formed in the outer surface of the outer layer permits the secure recognition of the circumferential direction or the axial direction and the position of the bonded area so that the bonded area and the air suction hole can be securely shifted from each other when the position of the air suction hole is set based on the position of the mark. In the separable laminated container of the present invention, the position of the air suction hole is not limited so that the air suction hole may be formed in any place. Therefore, the air suction hole may be formed in a neck of the container or a drum portion of the container. In addition, the method for forming the air suction hole is also not limited so that a welding means or a punching means by a punch may be employed. In the separable laminated container of the present invention, though the resin materials for the inner layer and the outer layer are not limited, it is preferable that resins which allow the easy separation therebetween are employed. As for the inner layer, a resin with high flexibility is preferably employed. The cross section of the separable laminated container is not limited particularly and thus may be any one of various configurations such as circle, ellipse, and rectangle. In the separable laminated container of the present invention, the bonded area may be linearly formed along the axial direction of the separable laminated container, may be circumferentially formed in a ring-like configuration, or may be partly formed in some spots. In addition, the mark may be formed in a position corresponding to the bonded area or in a position shifted from the bonded area. In the separable laminated container of the present invention, the bonded layer extends in the longitudinal direction of 'the container. Brief Description of Drawings Fig. 1 is a front view showing a separable laminated container according to a first embodiment of the present invention; Fig. 2 is a perspective view of a separable laminated container according to the present invention; Fig. 3 is a plan view of the separable laminated container according to the present invention; Fig. 4 is a cross sectional view showing the separable laminated container according to the present invention before separation of an inner layer; Fig. 5 is a front view of a separable laminated container according to the present invention, parts being broken away; Fig. 6 is a longitudinal sectional view of the separable laminated container according to the present invention, as shown from the right side; Fig. 7 is a longitudinal sectional view of a pre-separation device according to the present invention; Fig. 8 is an enlarged longitudinal sectional view showing components of the pre-separation device in the present invention; Fig. 9 is a left side view of a first air supply member of the pre-separation device in the present invention; Fig. 10 is a front view showing the first air supply member of the pre-separation device in the present invention, parts being broken away; Fig. 11 is a pneumatic piping drawing of the pre-separation device in the present invention; Fig. 12 is a longitudinal sectional view of a volume controller of the pre-separation device in the present invention; and Fig. 13 is a timing chart of the pre-separation device in the present invention. Best Mode for Carrying Out the Invention Hereinafter, embodiments of the present invention will be described with reference to attached drawings. Fig. 1 is a front view of a separable laminated container A according to a first embodiment. The separable laminated container A is made up of an outer layer 1 and an inner layer 2, is formed by blow molding, and comprises a drum portion 3, a neck 4, and a bottom 5. The outer layer 1 is made of high-density polyethylene to keep the profile of the container, and the inner layer 2 is an inner bag made of nylon which is separable from the outer layer and deformable. There is a separated area 8 formed between the outer layer 1 and the inner layer 2 and a bonded area 9 where the outer layer 1 and the inner layer 2 are partly bonded in the longitudinal direction. The bottom 5 of the container A is provided with a projection 6 which is formed by pinch-offs of a mold during the molding. The projection 6 is provided with a plurality of sunk portions 7 which are arranged zigzag and each sunk in the opposite bonded layer. The projection 6 allows the inner layer 2 strongly bonded to the outer layer 1 even when the inner layer 2 is made of resin such as nylon providing weak bond strength, thereby preventing the occurrence of slit due to the separation between the layers and thus preventing the entrapment of moisture. The neck 4 is provided with an engaging portion 10 formed at an upper end of inner layer 2 by an air blowing member during the blow molding. The neck 4 is also provided with an air suction hole 11 formed by a punching device in a punching method of the present invention. The air suction hole 11 is a hole for introducing air into a space between the inner layer 2 and the outer layer 1 in order to smoothly achieve the separation of the inner layer 2 with keeping the profile of the container A to completely pour out the content. Fig. 2 is a perspective view of a separable laminated container A according to a second embodiment, Fig. 3 is a plan view of the same, and the Fig. 4 is a cross-sectional view of a drum portion thereof. The container A comprises a drum portion 102 having an elliptical section, a shoulder 103 continuously connected to the upper part of the drum portion 102, and a cylindrical neck 104 extending upward from the center of the shoulder 103. The container A is made up of an outer layer 111 and an inner layer 112 overall from the neck 104 to a bottom 105 of the drum portion 102. The outer layer 111 and the inner layer 112 are bonded each other at a strip of bonded area 113, while the outer layer 111 and the inner layer 112 are just in contact with each other besides the bonded area 113 in such a manner as to be separable from each other. Fig. 4 shows a state before the inner layer 112 is separated from the outer layer 111. The bonded area 113 linearly extends from the top of the neck 104 to the lower edge of the drum portion 102 in the longitudinal direction of the container A and extends to the center of the bottom 105. The neck 104 of the container A is provided with an air suction hole 114 formed in the outer layer 111, 180° apart from the bonded area 113 in the peripheral direction. The air suction hole 114 is pierced only in the outer layer 111, not in the inner layer 112. The shoulder 103 is provided with three projections 115 formed in a line, as marks for peripheral positioning, in position 90° apart from the bonded area and the air suction hole 114 in the peripheral direction. In other words, the bonded area 113 is positioned at the right side of and 90° apart from the projections 115 in the peripheral direction and the air suction hole 114 is positioned at the left side of and 90° apart from the projections 115 in the peripheral direction. In the container A, a pump not shown is mounted in the neck 104 with the suction tube inserted into the container A through the neck 104 so that the content filled inside the inner layer 112 is pumped up and poured out through the pump. According to the decrease of the content within the inner layer 112, the inner layer 112 is separated from the outer layer 111 and shrinks. Where in the inner layer 112 the separation and shrinkage are started is dependent on the thickness distribution of the inner layer 112 or the like. Usually, the separation and shrinkage are started from a distant portion from the bonded area 113. When the pre-separation between the outer layer 111 and the inner layer 112 was made before filling the content, the separation and the shrinkage are started from the pre-separated portion. During the shrinkage of the inner layer 112, air is introduced between the outer layer 111 and the inner layer 112 through the air suction hole 114, thereby making the shrinkage of the inner layer 112 secure and smooth. The container A is made as follows. First, a laminated parison or laminated preform (hereinafter, referred to as the laminated parison) having a laminated structure corresponding to the separable laminated container to be manufactured is molded by extrusion molding or the like. During this molding, a bonded area extending the axial direction is provided in a predetermined position along the whole length thereof in such a manner as to allow the separation between the outer layer and the inner layer besides the bonded area. Then, the laminated parison is set in the mold and molded into a desired bottle-like configuration by blow molding in such a manner as to have an air suction hole in the outer layer. The blow mold is provided with three little concavities in a molding face of the shoulder 3, which is elliptical as seen from the top, of the container at the minor axis side thereof. These concavities are to form the projections 115 as marks for peripheral positioning. The projections 115 are formed by pushing parts of the outer layer into the concavities. The laminated parison is set in the mold in such a manner that the bonded area of the laminated parison is positioned at the major axis side of the molding face of the elliptical shoulder 103. Therefore, the projections 115 can be made at the position 90° apart form the bonded area 113 in the peripheral direction. As mentioned above, since the projections 115 are formed during the molding into the bottle-like configuration, the positional relation between the bonded area 113 and the projections 115 is defined. After the blow molding into the desired container configuration as mentioned above, the air suction hole 114 is punched in the outer layer 111 of the neck 104 by using the punching device of the aforementioned first embodiment. During the punching, the air suction hole 114 is punched at a position 90° apart from the projections 115 in the peripheral direction on the left of the projections 115 as seen with the projections 115 positioned on this side so that the air suction hole 114 can be positioned at the opposite side of (180° apart from) the bonded area 113, thereby securely preventing the overlapping of the bonded area 113 and the air suction hole 114. That is, since the position of the projections 115 of the shoulder 103 is defined, the position of the bonded area 113 is also defined. As the punched position of the air suction hole 114 is defined on the basis of the projections 115, the bonded area 113 and the air suction hole 114 can be securely formed apart from each other. When a sensor such as an optical sensor is used for detecting the projections 115, the container A can be controlled in its position and it direction on the basis of a detecting signal from the sensor for setting the container A to the punching device so as to compile with an on-line automatic production system. Though the air suction hole 114 is punched in the neck 104 of the container A by the punching device as mentioned in the first embodiment, the air suction hole 114 may be formed by any other hole-forming device than the punching device of the first embodiment or welding means. The good result was obtained when the container A of this embodiment was made in such a manner that the outer layer 111 was made of polyethylene, the inner layer 112 was made of nylon, and the outer layer 111 and the inner layer 112 were bonded with ADMER (adhesive polyolefin) (trade mark, by Mitsui Sekyu-Kagaku Kogyo Kabushikikaisha) to form the bonded area. The good result was also obtained when the container A was made in such a manner that the inner layer 112 was made by laminating ADMER on a nylon layer to decrease the water vapor permeability of the inner layer 112. Fig. 5 is a front view of a separable laminated container A according to a further embodiment wherein parts being broken away and Fig. 6 is a longitudinal sectional view of the same, as seen from the side. The separable laminated container A is made up of an outer layer 201 and an inner layer 202 and comprises a drum portion 203, a neck 204, and a bottom 205. The outer layer 201 is made of high-density polyethylene to keep the profile of the container, and the inner layer 202 is an inner bag made of nylon which is separable from the outer layer and deformable. The outer layer 201 and the inner layer 202 of the container A are made by blow molding of a laminated parison which is formed by co-extrusion. In this embodiment, the nylon used in the inner layer 202 is copolymer of nylon 6 having flexural modules of 650 kg/cm 2 , providing excellent flexibility. Besides the nylon 6, any other nylon or any other synthetic resin material may be employed for the inner layer 202. However, when the inner layer 202 is made of nylon 12 having flexural modules of 12,000 kg/cm 2 , the pre-separation should be made throughout the laminated face. This occurs the separation of the layers at the bottom 205 of the container A. Therefore, synthetic resin having flexural modules of equal to or more than 10,000 kg/cm 2 , that is, higher elasticity results a problem of difficulty of pre-separation and a problem of separation in the bottom. Therefore, it is preferable that the synthetic resin of the inner layer 202 has flexural modules of less than 10,000 kg/cm 2 . The outer layer 201 and the inner layer 202 are partly bonded in the longitudinal direction by a bonded area 206. The bonded area 206 is formed at the same time as the laminated parison by co-extrusion of the materials of the outer layer and the inner layer. The bonded area 206 prevents the deformation of the inner layer 202 in the vertical direction and allows the reduction and shrinkage in the radial direction during the deformation of the inner layer 202 so as to easily pour out the liquid content. The bottom 205 of the container A has a projection 207 which is provided with a plurality of sunk portions 208 formed by pinch-offs of the mold during blow molding. By providing such a projection 207 having the sunk portions 208, the bottom sealing portion can be strongly bonded even when the inner layer 202 is made of resin such as nylon providing weak bond strength, thereby preventing the separation between the layers and the cracking of the bottom. The neck 204 is provided with an engaging portion 209 formed at an upper end of inner layer 202 by an air blowing member during the blow molding, thereby preventing the dip of the inner layer 202. The neck 204 is provided with an air suction hole 210 punched in the outer layer 201. The air suction hole 210 is a hole for introducing the atmospheric air into a space between the inner layer 202 and the outer layer 201 in order to smoothly achieve the separation of the inner layer 202 with keeping the profile of the container A to completely pour out the liquid content. The air suction hole 210 is punched by using the punching device of the aforementioned first embodiment, that is, by setting a receiving face 212 of the receiving member 213 inside the neck 204 of the container A, driving a punch 211 into the outer layer 201 from the outside, and punching the outer layer 201 with the tubulous blade at the end of the punch 211 leaving the thickness of the inner layer 202 behind. In the container A, the inner layer 202 is previously separated from the outer layer 201 before filling the liquid content, that is, the pre-separation is made. With reference to Fig.7 through Fig.12, a pre-separation device C used in the pre-separation. The pre-separation device C comprises a first air supply member 220 for introducing pre-separating air through the air suction hole 210 and a second air supply member 230 for pressing the container A at a predetermined position and introducing air into the container A through the neck 204. The first air supply member 220 has a cylindrical body 221 which is provided with a through hole 222 inside thereof, a nozzle 223 at the front end of the cylindrical body 221, and a mounting portion 224 at the rear end of the cylindrical body 221, wherein the mounting portion 224 is provided with an internal thread 225 into which an air supply pipe is screwed. As shown in Fig. 9 and Fig. 10, the nozzle 223 has an opening 222a at the front end thereof and an opening 222b formed in the end face for communicating the through hole 222 and the side of the nozzle 223. The cylindrical body 221 is provided with a cylindrical portion 226 at the rear end of the cylindrical body 221. The cylindrical portion 226 holds an engaging end 227a at an end of a piston rod 227 of a cylinder C 2 so as to communicate the first air supply member 220 and the cylinder C 2 . In the cylindrical portion 226, a spring 228 is disposed between the cylindrical body 221 and the engaging end 227a and acts as an absorber when the nozzle 223 is inserted into the air suction hole 210. The second air supply member 230 has a cylindrical block 231 provided with a through hole 232 wherein the through hole 232 is bent in such a manner as to have a horizontal portion and a vertical portion. The block 231 has an engaging portion 233 formed at the lower end thereof which engages the neck 204 of the container A and presses the upper end of the container A so as to prevent the leakage of air. An opening 232a of the through hole 232 is formed in the center of the engaging portion 233. The block 231 has a mounting portion 234 at the side thereof, the mounting portion 234 being provided with an internal thread 235 into which an air supply pipe is screwed. The block 231 is provided with a cylindrical portion 236 on the upper face thereof. The cylindrical portion 236 holds the engaging end 237a at the end of the piston rod 237 of the cylinder C 1 and connects the second air supply member 230 and the cylinder C 1 . In the cylindrical portion 236, a spring 238 is disposed between the block 231 and the engaging end 237a and presses the engaging portion 233 of the block 231 to the neck 204 of the container A with a constant biasing force at the lower position of the piston rod 237, as well as acting as an absorber. In Fig.7 , Fig. 8, and Fig. 11, X, Y stand for the air supplying directions. With reference to Fig. 11, the description will now be made as regard for an air supply system. The cylinder C 1 for reciprocating the second air supply member 230 up and down comprises a cylinder member and a piston P 1 . The end of the piston rod 237 extending from the piston P 1 is connected to the second air supply member 230 through the spring 238. The cylinder member of the cylinder C 1 is provided with limit switches LS 1 , LS 2 for detecting the lower position and the upper position of the piston P 1 . The cylinder C 1 is connected to an isopiestic air tank (pressurized air supplier) 240 through a 4-port solenoid valve V 4 for operation. The air tank 240 supplies air to either one of two inlets of the cylinder C 1 corresponding to ON/OFF of the solenoid valve V 4 . The cylinder C 2 for horizontally reciprocating the first air supply member 220 comprises a cylinder member and a piston P 2 . The end of the piston rod 227 extending from the piston P 2 is connected to the first air supply member 220 through the spring 228. The cylinder member of the cylinder C 2 is provided with limit switches LS 3 , LS 4 for detecting the forward position and the backward position of the piston P 2 . The cylinder C 2 is connected to the air tank 240 through 4-port solenoid valve V 5 for operation. The air tank 240 supplies air to either one of two inlets of the cylinder C 2 corresponding to ON/OFF of the solenoid valve V 5 . The first air supply member 220 is connected to the isopiestic air tank 240 through a pressure reducing valve 242, 2-port solenoid valve V 1 , a volume controller 250, and 3-port solenoid valve V 2 . When the solenoid valve V 1 is turned on, air depressurized to a predetermined pressure by the pressure reducing valve 242 is introduced from the air tank 240 to the volume controller 250. When the solenoid valve V 1 is turned off and the solenoid valve V 2 is turned on, the air introduced into the volume controller 250 is supplied to the first air supply. member 220. The second air supply member 230 is connected to the air tank 240 through a pressure reducing valve 243 and the 3-port solenoid valve V 3 . When the solenoid valve V 3 is turned on, air depressurized to a predetermined pressure by the pressure reducing valve 243 is introduced from the air tank 240 to the second air supply member 230. The volume controller 250 comprises, as shown in Fig. 12, a cylinder 251, a lid 252 of the cylinder 251, a plate-like flow setting member 253, a ring-like sealing member 254 fixed to the flow setting member 253, a positioning screw 255 screwed to an internal thread formed in the lid 252 and having an end connected to the flow setting member 253, a knob-mounting end 256, and a lock nut 257. There is a pressurized air storage 258 formed between a bottom wall of the cylinder 251 and the flow setting member 253. As mentioned above, the air in the predetermined pressure is introduced into the pressurized air storage 258 of the volume controller 250 and a pipe line corresponding to ON/OFF of the solenoid valves V 1 , V 2 and then introduced, as pre-separating air, between the outer layer 201 and the inner layer 202 of the container A through the first air supply member 220. Though the volume of the pre-separating air depends on the volume of the container A, the pre-separating air between 1 cc and 3 cc may be enough. Therefore, a small volume controller may be enough as the volume controller 250. The volume of air is controlled by turning the knob-mounting end 256 of the positioning screw 255 to control the position of the flow setting member 253. Since a separated area 215 made by the pre-separation as shown in Fig. 5 is disposed in a small range between the neck 204 and the shoulder of the container A, it is not necessary to control the size of the separated area 215 depending on the volume of the container A. Once the separated area 215 is set to a predetermined size, it is not necessary to change the size even with containers A of somewhat different volumes. Hereinafter, the pre-separation device C will be described. The pre-separation device C is provided with an electric controller (not shown) as control means for controlling the opening and closing of the respective solenoid valves V 1 through V 5 . The controller includes two timers T 1 , T 2 inside thereof and inputs a positional signal S 1 for detecting that the container A carried by a conveyer is held in a predetermined position and outputs an operational signal S 2 for commanding to carry out the container A when the pre-separation is completed. With reference to the timing chart of Fig. 13, the operation and the pre-separation method of the pre-separation device C will be described. As a power source is turned on, the solenoid valve V 1 is also turned on so that the depressurized air is introduced into the volume controller 250 so that a fixed volume of air at a fixed pressure is stored. As the positioning signal S 1 is then inputted, the solenoid valve V 1 is turned off, the solenoid valve V 4 is turned on, the piston P 1 of the cylinder C 1 moves down to the stroke end where the second air supply member 230 engages and presses the neck 204 of the container A and the limit switch LS 1 is turned on. The turning-on of the limit switch LS 1 turns on the solenoid valve V 5 so as to move the piston P 2 of the cylinder C 2 forward to the stroke end where the nozzle 223 of the first air supply member 220 is inserted into the air suction hole 210 of the neck 204 so that the inner layer 202 is pressed by the distal end of the nozzle 223 and thus separated from the outer layer 1 and the limit switch LS 3 is turned on. The turning-on of the limit switch LS 3 turns on the solenoid valve V 2 and the timer T 1 so that the air stored in the volume controller 250 is introduced between the outer layer 201 and the inner layer 202 through the openings 222a, 222b of the nozzle 223 of the first air supply member 220 so as to separate a part of the inner layer 202 to form the separated area 215. At this point, the distal end of the nozzle 223 moves forward according to the separation of the inner layer 202 around the air suction hole 210 in such a manner that the opening 222b on its side is completely communicated with the separated area 215 as shown in Fig.8. As the timer T 1 times out, the solenoid valve V 2 is turned off and the solenoid valve V3 and the timer T 2 are turned on so that the air at the fixed pressure is blown into the container A from the second air supply member 230, the air previously introduced into the separated area 215 is discharged from the opening 222b on the side of the nozzle 223 through the first air supply member 220, and the end of the nozzle 223 is eventually moved backward to the outer layer 201 to completely return the inner layer 202 to the original state. As the timer T 2 times out, the solenoid valve V 3 and the solenoid valve V 5 are turned off so as to stop the blowing of the air by the second air supply member 230, move the piston P 2 of the cylinder C 2 backward and move the first air supply member 220 backward. When the piston P 2 of the cylinder C 2 is moved backward to the stroke end, the limit switch LS 4 is turned on and the solenoid valve V 4 is thus turned off so as to move the piston P 1 of the cylinder C 1 upward and move the second air supply member 230 upward. When the piston P 1 reaches the upper position of the stroke end, the limit switch LS 2 is turned on so as to turn on the solenoid valve V 1 and output the operational signal S 2 to carry out the container A from the position for the pre-separation. As stated above, the container A with the air suction hole 210 is held in the position for the pre-separation, after that, the pre-separating air is introduced between the outer layer 201 and the inner layer 202 through the air suction hole 210 by the first air supply member 220, and then the air is blown into the container A through the neck 204 by the second air supply member 220 so as to discharge the pre-separating air previously introduced to return the inner layer 202 to the original state. In this manner, the pre-separation is finished. In the separable laminated container A of this embodiment, since the synthetic resin having flexural modules of less than 10,000 kg/cm 2 is employed as the material of the inner layer 202, the inner layer 202 separated from the outer layer 201 smoothly shrinks according to the decrease of the liquid content when the separable laminated container A is in use. In addition, by previously separating only a part of the inner layer 202 around the air suction hole 10 from the outer layer 201, the air is smoothly introduced between the outer layer 201 and the inner layer 202 even in the initial stage of pouring out the liquid content when the separable container is in use, thereby facilitating the separation of the inner layer 202. Since only a part of the inner layer 202 is separated in the pre-separation, a small amount of pre-separating air is enough. In addition, it is not necessary to control the volume of the air even with separable laminated containers A of somewhat different volumes so that the operation is easy. Though the air suction hole 210 is formed in the neck 204 in the separable laminated container A of this embodiment, the air suction hole 210 may be formed in the drum portion 203. Though the air suction hole 210 is punched by the punching means, the air suction hole 210 may be punched by welding means. Industrial Applicability The separable laminated container of the present invention allows the inner layer to be securely and easily separated from the outer layer and can be used as a container for accommodating various types of liquid such as face lotion, shampoo, and rinse, and is also particularly suited for a container with a pump.

Claims: A separable laminated container comprising: (a) an outer layer (1) made of synthetic resin, having an air suction hole (11); (b) an inner layer (2) made of synthetic resin, separably laminated on the inside of said outer layer, wherein the inner layer is partly bonded with the outer layer by a bonded area (9), wherein the bonded area (9) is disposed apart from said air suction hole characterised in that the outer layer (1) is provided with a mark composed of projections (115) or indents which are formed in the outer surface thereof during molding into a container configuration. A separable laminated container as claimed in claim 1, wherein said bonded layer (9) extends in the longitudinal direction of the container.

Inventors: AKIYAMA YOSHIO, GOTO TAKAYUKI, NOMOTO TSUGIO, SHIBANO YOSHIO, YONEYAMA MASASHI, AKIYAMA, YOSHIO, GOTO, TAKAYUKI, NOMOTO, TSUGIO, SHIBANO, YOSHIO, YONEYAMA, MASASHI, Akiyama, Yoshio c/o Tochigi Plant, Goto, Takayuki c/o Yoshino Kogyosho Co., Ltd., Nomoto, Tsugio c/o Yoshino Kogyosho Co., Ltd., Shibano, Yoshio c/o Tochigi Plant, Yoneyama, Masashi c/o Yoshino Kogyosho Co., Ltd.
Applicants: YOSHINO KOGYOSHO CO LTD, YOSHINO KOGYOSHO CO., LTD.
Application year: 1996
Main classification: B05B11
IPC codes: B65D1, B05B11, B29C49, B65D83