JPS58175636A - Squeeze tube and manufacture thereof - Google Patents

Abstract

PURPOSE:To prevent the delamination of a laminated material due to water absorption, by filling a squeeze tube composed of laminating materials containing a paper layer between with contents, sealing its end and cutting it, then adhering a waterproof material to a cut part. CONSTITUTION:For example, a cylindrical object is shaped by using the laminated material 5 contaning a paper layer between like a five layers structure of a polyethylene layer 6, a paper layer 7, a polyethylene layer 8, an aluminum foil layer 9 and a polyethylene layer 10, a stopper 2 is shaped at its top and contents (e.g., a toothpaste) 11 is filled from another opening part, then the opening part is sealed and a bottom part 4 is shaped by cutting the sealed part in a certain size. Then, the thin waterproof layer 12 composed of a waterproof material selected from a polyethylene, a hot-melt adhesive, an intermediate molecular weight polyolefine, a wax, a paraffin, a sizing material, a silicone and an acryl modified rosin is formed at the exposed end of the bottom part 4.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an extrusion chip 1 having a multilayer structure with a paper layer in the middle.
-Relating to a tube and a method for manufacturing the same.

In general, in extruded tubes called laminate tubes whose tube bodies are made of laminated materials, if the laminated materials are made only of plastic layers, the resilience is too strong and an air-pack phenomenon occurs, causing the air that flows into the tube to It may change the quality of things. In addition, in order to prevent this air-pack phenomenon and prevent the dispersion of moisture, fragrance, etc. in the contents, a laminated material consisting of an aluminum foil layer and a Plus Deck layer is generally used. If the aluminum foil layer is made thicker for the purpose of giving it a suitable stiffness and texture, there are disadvantages of wrinkles and loss. Therefore, in order to solve this problem, attempts have been made to add a paper layer in addition to the plastic layer and aluminum foil layer, and to use a laminated material to give the tube body an appropriate stiffness and texture. . For example, as an extrusion duplex for toothpaste, a five-layer laminated material consisting of a polyethylene layer, a paper layer, a polyethylene layer, an aluminum oil layer, and a polyethylene layer is used from the outside, and a spout that serves as an outlet for the toothpaste is attached to one end of the tube body. It is known that the other end is formed in a local area cut for sealing and external appearance. Because of this manufacturing process, it is common for paper scraps to be exposed in the private parts, so the paper layer absorbs moisture during use, or it is necessary to store the product vertically in a container with the private parts facing down at 50°C. If there is a lot of water left in this tip, the paper layer will absorb this water, which will significantly deteriorate the adhesive strength between the paper layer and the polyethylene layers on both sides.
It also caused delamination.

Therefore, only when the outermost layer is made of a thermoplastic resin material, we take advantage of the property that the thermoplastic resin can be reversibly melted and assimilated by heating and cooling. On the other hand, an attempt has been made to heat-seal again to raise the outermost layer of thermoplastic resin toward the local end and cover this end surface.

However, the end surface of the local area is uneven and unsightly, and not only is it difficult to tell why it was cut to a certain size after the initial sealing, but in reality, the resin does not bulge at the end due to resealing. - In addition, there were inconveniences such as a decrease in production efficiency due to the process of sealing → cooling and resealing.

The present invention was invented in view of the above circumstances, and it is an object of the present invention to provide an extruded tube whose local end face is waterproofed, and to provide a manufacturing method that can easily and inexpensively manufacture such an extruded tube. This is the purpose.

Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of application to an extruded tube for toothpaste, in which the tube body 1 is formed using a laminated material 5 as shown in FIG. 2
A cap 3 is attached to the spout 2 to seal the local part 4 of the tube body 1. The laminated material 5 has a five-layer structure including a Bolier titanium layer 6, a paper layer 7, a polyethylene layer 8, an aluminum foil layer 9, and a polyethylene layer 10, as shown in FIG. 2, for example. This five-layer laminated material 5 is first formed into a hollow cylindrical shape, with a spout 2 formed on the head, and then toothpaste 116- is filled through an opening at one end, and this opening is sealed. In order to remove the end of the laminated material 5 protruding from the seal part, the seal part is cut to a certain size to form the local part 4. Then, a waterproof thin layer 12 made of polyethylene or the like is formed on the exposed end surface of this local part 4. In addition to polyethylene, the waterproof material forming this thin waterproof layer 12 may include hot melt adhesive, medium molecular weight (low degree of polymerization) polyolefin, wax, paraffin, sizing agent, silicone, acrylic modified rosin, etc. . When this waterproof thin layer 12 is made of a material with high viscosity, it is formed in a bulging manner on the exposed end surface of the private part 4 as shown in FIG. 3, and when it is made of a material with low viscosity, it is formed as shown in FIG. The material is infiltrated into the paper layer 7.

The formation of this waterproof thin layer 12 is applied to the contents (e.g. toothpaste 11)
After filling, one end opening for this filling is sealed, and this is done before the packaging process after cutting. That is, following the flow of filling → sealing → cutting, a waterproof material is applied to the exposed end surface of the private part 4 while moving it to the next boxed culm with the private part 4 facing upward. A thin waterproof layer 12 is applied. As this application means, as shown in FIG.
By rolling in contact with the exposed end surface of the extruded tube, it is possible to form an unobstructed flow of the extruded tube toward the packaging process.This roller 13 is connected to a material supply source, and the material is It is designed to be supplied onto the outer circumferential surface through the small hole 13a.Therefore, if this roller 13 is installed in a fixed position and the end surface of the local part 4 passes under it in contact [), it will automatically be supplied. A thin waterproof layer is formed.

Note that the center mark @ in FIG. 5 is a tube boulder attached to a transfer device (conveyor) not shown. In addition, as another application means, it is also possible to move an applicator 14 up and down as shown in FIG. 6 to sequentially attach the waterproof material supplied to the applicator 14 to the exposed end surface of the private part 4. Alternatively, as shown in FIG. 7, the local part 4 of the extruded tube being transferred may be held between the clamping members 15, and the waterproof material may be applied while it is being held. Alternatively, as roughly shown in FIG. 8, the private part 4 may be held between the pinching members 15 and the private part 4 may be sprayed with the spray 16T-waterproofing material. This clamping member 15 has a hole 15a1 hose 151) for collecting excess waterproof material.

As shown in FIG. 9, the manufacturing method for the head is to form a laminated material 5 (see FIG. 2) having a paper layer in the middle into a cylindrical shape, form a spout 2 on the head, and then open an opening at one end. It is also possible to form the waterproof thin layer 12 by filling the contents from the first part, sealing and cutting after filling to form the private part 4, and immersing it in a tank 17 storing liquid of a waterproof material for a predetermined period of time.

As another manufacturing method, as shown in FIGS. 10 and 11, a film 18 made of a waterproof material such as polyethylene is cut to the same length as the width of the local part 4 in the local part 4 where the cross section of the laminate 5 is exposed. It is also possible to form the waterproof thin layer 12 by folding the cut film 18 in half and covering the private part 4, and then thermally bonding the film 18 to the private part 4. Note that not only one film 1B but also a plurality of films can be thermally bonded to the local area 4.

10- As explained above, according to the present invention, the presence of the waterproof thin layer can prevent water from penetrating through the paper layer on the locally exposed end face and causing delamination, and also prevents deterioration of the appearance. do not have. Furthermore, when a material with low viscosity is used as the waterproof material and is impregnated into the paper layer, there is no fear that the thin waterproof layer will peel off from the end face of the wide portion. Furthermore, since the private part becomes relatively hard due to the presence of the waterproof thin layer, there is also the advantage that stability is improved when the private part is placed face down in a cup or the like.

In addition, this thin waterproof layer can be formed by simply applying a waterproofing material on the local end face while transporting the local end face up to the next packaging process, and the equipment is simple and conventional. There is an advantage that there is no need to change the flow of the manufacturing process and there is no need to reduce production efficiency. Especially Laura, who is transferred
In this method, the wide end surface of the extruded tube that is transferred to the packaging process is passed through the bottom side of the tube (with waterproof material attached to the outer circumferential surface), and the waterproof material is applied by contacting the wide end surface with a sun roller. 10- It is possible to form a waterproof thin layer extremely efficiently, and furthermore, in the case where the wide part is held between the clamping members and the waterproof thin layer is formed on the local end face, the waterproof thin layer can be formed reliably and neatly. be able to.

Furthermore, when the wide portion is held between pressure members and the waterproof material is sprayed onto the local end surface, a thin waterproof layer can be formed evenly and uniformly.

In addition, according to the present invention according to another manufacturing method, a laminated material having a paper layer in the middle is formed into a cylindrical shape [), a spout is formed on the head, and the contents are poured from the opening at the end. Fill it, seal it after filling, and cak! to form a wide part, and while transporting to the next packaging process with the end face of the wide part where the cross section of the laminate is exposed facing down, this local end face is immersed in a pool of waterproof material to make it waterproof. Since a thin layer is formed, there is no need for any special equipment for forming a waterproof thin layer, and an extruded duplex having a wide part that has been subjected to waterproofing can be manufactured at low cost, similar to the invention related to the previous manufacturing method. The effect and effect are also Qin.

According to the present invention, which relates to yet another manufacturing method, a film made of waterproof material such as polyethylene is folded in half and covered over the wide part where the cross section of the laminate is exposed, and this film is thermally bonded to the wide part to make a waterproof thin film. By forming a layer, the strength and waterproofness of the thin waterproof layer increases.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the external appearance of the extruded duplex according to the present invention, Fig. 2 is a cross-sectional view of the laminated material constituting the tube body, Fig. 3 is an enlarged cross-sectional view of the wide part, and Fig. 4 is also a cross-sectional view of the wide part. An enlarged sectional view showing another example, FIG. 5 is an explanatory view showing an example of means for forming a waterproof thin layer, FIG. 6 is an explanatory view similar to FIG. 5 showing another example,
FIG. 7 is an explanatory diagram similar to FIG. 5 showing another example, FIG. 8 is an explanatory diagram showing application of waterproof material by spraying, and FIG. 9 is an explanatory diagram showing an example of the present invention relating to another manufacturing method. An explanatory diagram showing,
FIG. 10 is an explanatory view showing an example of the present invention relating to yet another manufacturing method, and FIG. 11 is an explanatory view showing the next step of FIG. 10. 1...tube body, 2...mouth plug, 4...wide part, 5...laminated material, 12...waterproof thin layer . 20 Figure 5 Figure 6 Figure 8 Figure 9 Figure 7

Claims (1)

[Claims] 1. In an extruded tube made of a laminated material with a paper layer in the middle, one end of the laminated material is sealed after filling with contents, and then this sealed portion is cut to expose a cross section of the laminated material. The exposed end surface of this local area is coated with polyethylene, hot melt adhesive, medium molecular weight polyolefin, wax, paraffin, etc.
An extruded tube characterized in that a thin waterproof layer is formed from a waterproof material selected from among sizing agents, silylon, and acrylic modified rosin. 2. The extruded tube according to claim 1, wherein the thin waterproof layer is made of a material with low viscosity and is impregnated into the paper layer of the laminated material. 3. After forming the laminated material with a paper layer in the middle into a cylindrical shape and forming a plug on the head, fill the contents through the opening at one end, and after filling, seal and cut to form a private part. Extrusion is characterized in that a waterproofing material is applied on the local end face to form a waterproof thin layer while the laminate is transported to the next packaging process with the local end face where the cross section is exposed facing up. Method of manufacturing tubes. 4. While being transferred to the packaging process, a roller with a waterproof material attached to the outer circumferential surface is transferred, and the extruded tube is transferred under this roller so that the local end surfaces are in contact with each other to form a thin waterproof layer. 4. A method for manufacturing an extruded tube according to claim 3, characterized in that the extruded tube is formed by: 5. The method for manufacturing an extruded tube according to claim 3 or 4, characterized in that the local part is clamped by a pressure member during the formation of the waterproof thin layer. 6. The method for manufacturing an extruded tube according to claim 5, characterized in that a waterproof material is applied by spraying onto the local end surface. 7. Form the laminated material with a paper layer in the middle into a cylindrical shape, and after forming a plug on the head, fill the contents through the opening at one end, and after filling, seal and cut to form a private part. Then, while the laminate is transported to the next packaging process with the exposed local end facing down, this local end is immersed in a pool of waterproofing material to form a thin waterproof layer. Features: A manufacturing method for extruded tubes. 8. Form the laminated material with a paper layer in the middle into a cylindrical shape, and after forming a plug on the head, fill the contents through the opening at one end, seal after filling, and remove the private part. The extruded tube is characterized in that a film made of a waterproof material such as polyethylene is folded in half and covered with the exposed local part of the cross section of the laminate, and this film is thermally bonded to the local part to form a waterproof thin layer. Production method.