JPS5822434B2 - Crushable extruded container and method for manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to containers, particularly extruded containers that can be crushed by hand, and a method for manufacturing the same.

Extruded containers that can be crushed by hand are used for cosmetics, for example.
Used as extruded containers for shampoo, food products, toothpaste, etc.

Such extrusion containers have a tube body made of deformable material that is closed at one end and equipped with an extrusion head or nozzle that can be sealed at the other end.

Traditionally, extruded metal tubes have been used as such containers.

However, due to repeated use, metal tubes, especially aluminum tubes, become brittle, and it has become necessary to sufficiently coat the inner surface of metal tubes to protect them from corrosion and contamination of their contents. As problems have arisen, thermoplastic synthetic resins such as polyethylene have recently been used in container bodies instead of metal tubes.

However, in the case of thermoplastic synthetic resins such as polyethylene, their permeability causes deterioration of certain products.

For example, the flavor of dentifrice is degraded during storage due to such permeability.

Additionally, plastic containers absorb oxygen, and over a period of time such absorption can degrade the product within the container.

Laminated structures have been adopted as an attempt to avoid these problems.

The laminate comprises a barrier layer of metal foil and inner and outer layers of thermoplastic synthetic resin, such as polyethylene.

Although collapsible metal, plastic, and laminate containers such as those described above have had some success over the years, each has its own problems, including those discussed above. These problems can make the containers very expensive to manufacture, limit the materials for which they can be made, and limit the uses of the containers in relation to the product being packaged.

That is, the tube body of a container with a laminated structure is made by first forming a flat laminate into a tube shape with overlapping ends and then heat sealing the ends, which tube has a vertical seam. .

In order to heat seal the inner and outer layers, it is necessary that the inner and outer layers are thermally compatible, and for the same reason, it is necessary that the materials of the inner and outer layers be thermoplastic.

Thus, the selection of materials is limited, and because of the limited selection of container materials, the applications of the containers produced are also limited.

Therefore, even if a barrier layer in the laminate is provided,
A thin inner layer of plastic material is necessary to protect the contents in the container from the barrier material and/or to allow heat sealing of tube seams made from laminates.

Furthermore, as mentioned above, heat sealing is required, so this inner layer must be a thermoplastic material.

Therefore, even though the inner film is made as thin as possible, some degree of permeability remains in the finished container.

Up until now, tube container bodies have been made by heat sealing, which required compatibility.

Therefore, it has not been possible to employ materials in the laminate that would minimize the permeability of the inner layer of the resulting container.

With further discussion of tube container bodies having longitudinal seams, the presence of longitudinal seams poses several problems in marking on tube bodies.

That is, because of the longitudinal seam in the tube body, the plastic film forming the outer layer of the laminate must be preprinted by gravure printing, or one of the outer layers of the laminate must be preprinted paper or plastic; In the latter case the outermost laminate is usually a transparent plastic material.

Such preprinting is expensive, which increases the cost of the finished container, and it is difficult to form the tube body so that the printed representation is not misaligned or distorted in the longitudinal and lateral directions of the formed tube. requires highly accurate preprints.

Because of the vertical heat-sealed seam in the tube body, the surface shape of the tube is not actually circular, although it should be circular, and therefore the tube cannot be formed using inexpensive techniques such as roll printing. Unable to print.

Furthermore, the head or nozzle portion of such extrusion containers having a body of unitary plastic or laminate construction has heretofore been attached primarily to the tube body by heat sealing.

In order to heat seal, the head and shell must be compatible, and it is necessary to use a thermoplastic material for the head as well as the shell.

Therefore, the material selection for the head is also limited, and thus the use of the container is also limited.

Furthermore, as a result of sealing the head member and body member together, the manufacture of such conventional containers is time consuming and expensive.

This means that it takes time to precisely control the heating of the plastic to the melting temperature required for heat sealing, and then considerable time to cool down before the body and head can be removed from the mandrel or jig where assembly takes place. It takes time.

This limits production rates and requires specific heating, cooling,
This increases the unit price of the container along with the pressurizing device.

This high price of the container prohibits it from gaining acceptance in certain product markets that would be viable markets if the price were lower.

In addition, heat sealing compromises the structural integrity of the body material near the head, resulting in an unsuitable container or a container that is susceptible to rupture during use.

In the past, a wide variety of two-piece assemblies have been devised for mechanical attachment to paper, metal, plastic or laminated tube bodies.

Generally, in such a two-piece assembled head, the axial ends of the tube body are placed between two head members, and the ends are fastened together by the two members.

Although the heat sealing problems described above are avoided when the head is mechanically attached to the barrel, conventional assembled heads that are mechanically coupled have not been commercially acceptable to date.

The reasons for this are that an airtight seal cannot be obtained, that the pressure applied to the joint between the assembly head and body during use of the container causes the assembly head and body to separate, and that the structure and assembly are complicated. This is because productivity is low and manufacturing costs are high.

As for creating an airtight seal, if there is a thick opening at the joint between the assembly head and the body, the contents of the container may seep through the tight opening or enter the inside of the container through such a tight opening. Since the contents may be contaminated by contact with air, it is desirable that the joints have no thick openings.

Separation of the body and head of the container is clearly undesirable since separation of the body and head during use of the container would destroy the extrusion and product storage functions of the container.

When it comes to assembly time, product cost and manufacturing time are critical issues in this industry, as countless extruded collapsible containers are manufactured each year for use in a highly competitive market. .

Many mechanical assembly heads that have been offered to date require threaded engagement of the head member or application of adhesive between the tube body and the head member, and these assembly processes are time consuming and Production speed is limited, resulting in higher than planned manufacturing costs.

This invention improves the above-mentioned drawbacks of conventional collapsible containers.

The present invention provides a manually crushable container having a laminated body that includes an inner layer of lower permeability than the inner layer of conventional laminated bodies.

More specifically, the inner layer of the container body is made of thermosetting plastic.

This thermosetting plastic is, for example, an epoxy resin bonded to a barrier layer of metal foil.

In this case, the metal foil epoxy resin is formed into a tube with overlapping side edges, which is then encapsulated in a plastic sheath, such as by extrusion.

The tube body thus produced can be assembled with any suitable head by gluing or heat sealing, or can be assembled with a two-piece assembled head as described below.

This outer plastic sheath allows for the production of a heat-sealed seamless container body, which allows for roll printing after tube production.

Considering that conventional heat seal seam tubes required preprinting, the present invention provides a much more economical procedure due to the ability to roll print.

Additionally, the plastic sheath maintains the barrier layer and epoxy inner layer on the tube body and does not require compatibility of the inner and outer layers for heat sealing, allowing a variety of materials to be used as a laminate.

It will therefore be appreciated that the laminate may include additional layers of paper, plastic, foil, etc. between the barrier layer and the plastic sheath.

Fundamentally, the combination of materials used is limited only by issues of the product being packaged and the ability to achieve the desired structural integrity between each layer of the laminate.

Assuming the head and outer body layers are compatible, the Chicove body can be joined to the extrusion head by heat sealing the outer body layer and the head, but it is preferred to form the body into a two-piece assembly. mechanically to the head, preferably by an interference fit using the method of the present invention and a two-piece assembled head.

This is preferred as it minimizes production costs and also increases the variety of materials used in container construction.

A container constructed according to another aspect of the invention includes:
It has a two-piece assembly head that is hermetically sealed and attached to the container body.

The container body includes at least one layer of thermoplastic material, and the airtight seal is achieved by an improved method of assembly and an improved interference fit between the body material and the assembly head member.

The head member may be metal or plastic, or a combination thereof, and the plastic material may be either a thermoset or a thermoplastic.

The Chicove body may be plastic or a laminate of plastic materials, a laminate of plastic and foil, a laminate of plastic and paper, or other laminates.

More specifically, in accordance with a preferred embodiment, the assembly head is comprised of two mating members and has a cooperating groove-to-protrusion arrangement between the two members.

This groove-protrusion arrangement allows the end of the Chicove body to be placed between the two members and securely engaged.

The groove-protrusion arrangement includes a pair of opposing sealing surfaces separated by a distance less than the wall thickness of the barrel.

When the body ends are heated to soften the thermoplastic layer, the distance between the seal surfaces is less than the body wall thickness, so the body wall thickness that exists between the seal surfaces is reduced and the plastic material flows. to fill the void between the head members.

This provides an airtight seal that prevents air or product from leaking from the connection between the body and the assembly/rad.

Additionally, the tight engagement of the head members ensures an airtight seal and the orientation of the sealing surfaces, ensuring that the container body remains secure even if pressure is exerted on the container body during use. It is securely secured between the head members.

Assembly of the head member can be accomplished without heat sealing, adhesive bonding, or complex mechanical manipulation of the parts, such as screwing, resulting in high production rates.

That is, approximately 18 to 40 per minute when using heat sealing.
containers per minute, compared to approximately 60 to 100 containers per minute according to the invention.

Manufacturing time is therefore considerably reduced and the cost of the equipment used to assemble the body and head is reduced, all of which result in lower unit costs for a given container.

Accordingly, it is a salient object of this invention to provide an improved collapsible extrusion container.

Another object of the present invention is to provide a manually collapsible container consisting of a laminated tube body with a plastic inner layer that exhibits less product penetration than the inner layer of conventional containers.

Yet another object of the invention is to provide a collapsible container constructed from a laminated body having an outer surface that is not interrupted by longitudinal seams.

Still another object of the present invention is to provide a collapsible container consisting of a Chicove body having an inner layer surface of epoxy resin, and a rad that firmly engages and holds the container body between rad members. It is to be.

Another object of this invention is to provide a collapsible container with a wider selection of materials for use as head and container body components than heretofore available.

Yet another object of the invention is to provide a collapsible container in which the container body and head member are hermetically assembled without heat sealing or adhesive bonding.

Yet another object is to provide a collapsible container in which the head member is an improved two-piece assembled head that is joined air-tightly and with improved structural integrity to the Chicove body.

Yet another object of the invention is to provide a method of assembling a collapsible container head and body.

The foregoing objects will be explained in detail above in part with reference to embodiments of the invention, which are in part self-evident and in part are illustrated in the accompanying drawings.

The drawings are for the purpose of illustrating preferred embodiments of the invention and are not intended to limit the invention.

FIG. 1 shows a collapsible extruded container 10 of the present invention.

The container 10 includes a body 12 made of a deformable material and an assembly head 14, the assembly head 14 comprising a first head member 16 and a second head member 18, which are attached to one end of the body. .

As is well known, such extrusion containers have a head attached to one end of the Chicove body, with the opposite end left open for receiving the product.

Then, the extruded end of the container is covered with a cap, and after the product is put into the container from the open end, the open end is laterally folded and sealed appropriately to form the closed end 20.

According to the invention, and for reasons explained below, the Chicove body 12 is made of metal foil, thermoplastic or thermoset plastic sheet 1 or extruded Chicove, and laminates thereof or other suitable materials, It can be made of any suitable material, for example a laminate with paper.

The term "deformable material" refers to the ability of the Chicove body to deform when manually squeezed to extrude the contents from the body.

Therefore, plastic materials or laminates that tend to return to their undistorted shape after such squeezing are as susceptible to deformation as are metal foils or laminates, where the foil provides rigidity that allows permanent deformation of the tube body. It is considered to be a material that can be used.

In the embodiment of FIGS. 1 and 2, the body 12 is shown as a single layer of plastic material, such as polyethylene, for ease of explanation.

Chicoves of plastic material are made by extrusion or by forming sheets of plastic material into seamed chicoves.

The first head member 16 is circular in cross-section with respect to the axis A of the extrusion vessel and is made of a plastics material, such as urea-formaldehyde resin in the illustrated embodiment.

As best illustrated in Figures 2 and 3,
The head member 16 has an extrusion nozzle portion forming a neck 22, which is centrally bored to define an outlet or extrusion passageway 24 opening through the first head member.

The neck 22 is threaded on the outside and is screwed on with an internally threaded cap (not shown) after use.

The first head member 16 further includes a skirt portion 28 .

Skirt portion 28 surrounds the lower end of neck 22, projects radially outwardly therefrom, and has a peripheral outer end 30.

This peripheral outer end is circular and can be slid axially into the open end of the tube body 12, as shown in FIG. The diameter dimensions are determined as follows.

An annular groove 32 coaxial with the neck 22 is provided on the axially outer side of the skirt portion 28 .

This groove 32 is formed by a radially inner groove wall 34 that is radially opposite to each other.
and an outer channel wall 36.

Outer surface 2 of skirt portion 28 adjacent the lower end of neck 22
8a tapers outwardly and downwardly so that the inner wall 34 of the groove 32 has a greater axial length or wall height than the outer wall 36.

The groove 32 further has a radially extending bottom wall 38 and a radially extending planar wall 39.

This planar wall 39 is perpendicular to the outer wall 36 of the groove and the outer edge 30 of the skirt.

The inner wall 34 has a radially projecting rib 40 formed continuously around the wall, which serves the purpose described below.

The second head member 18 is ring-shaped and, in the embodiment shown, is made of a plastic material such as polyethylene.

Head member 18 has a circular inner wall 42 having an inner diameter corresponding to the diameter of inner wall 34 of groove 32 and a wall height slightly lower than inner wall 34 .

Furthermore, this ring member 18 has a radially outer annular wall 44
The lower end 45 of this annular wall 44 is rounded or tapered.

The annular outer wall 44 has a diameter slightly smaller than the diameter of the outer wall 36 of the groove 32 for purposes described below.

Ring member 18 further includes a radially extending bottom wall 46;
a planar wall 50 extending radially and perpendicular to the outer wall 44 of the ring;
The radially extending flange portion 48 includes a radially extending flange portion 48 .

The outer wall 44 and the planar wall 50 intersect at a corner 51 extending around the ring periphery, the wall 44 forming a radial sealing surface radially opposite the wall or sealing surface 36 of the first head member for purposes described below. I will provide a.

The axially outer or outer surface 52 of the ring has a taper that matches the taper of the skirt wall 28a.

The annular inner wall 42 is formed with a circular continuous groove 54 positioned and dimensioned to receive the rib 40 of the head member 16 in the manner and for the purposes described below.

Inner wall 42 of ring member 18. Outer wall 44 and bottom wall 46 form a protrusion that is axially received within groove 32 of head member 16 .

When assembling the two Rad members, the lower portion of the ring wall 42 is moved axially past the rib 40 on the inner wall 34 of the member 16 until it lines up with the groove 54, at which point the rib 40 fits into the groove 54, locking the ring in place and preventing axial separation of the ring from the end member 16.

The relative axial position of ribs 40 on wall 34 and grooves 54 on wall 42 and the radial engagement between walls 34 and 42 result in a gap between axially opposing walls 39 and 50 and forming a predetermined spacing between radially opposing walls 36 and 44;
can be maintained.

Instead of such rib-to-groove interengagement, the diameters of walls 34 and 42 may be such that they form an interference fit, thereby interengaging the head members in a locking manner and interengaging the opposing walls. can also be maintained at a predetermined interval.

When the two head members are assembled, the radially opposed walls or sealing surfaces 36 and 44 are radially opposed at a distance slightly less than the wall thickness of the material of the Chicove body 12. .

Preferably, the axially opposing walls 39 and 50 of the two head members are axially separated by a distance that accommodates the wall thickness of the body material.

These dimensional relationships create a clearance between the opposing walls, which maintains an airtight seal between the rad members 16 and 18 and the body material, and facilitates assembly during use.
The rad can be assembled and attached to the barrel end in such a way that the axial end of the barrel material is tightly engaged between the head members 16 and 18 to prevent separation of the barrel from the rad.

In more detail in this regard, as can be seen in FIG. Next, at step 121], it is bent downward in the axial direction so as to be above the groove wall 36.

Since the thickness of the material of the Chicove body 12 is greater than the space between the opposing walls 36.44, the portion 12b is radially compressed.

According to the invention, the plastic material is heated to facilitate bending and remove plastic memory by heating sections 12a and 12b, and by radial compression of section 12b as best shown in FIG. flows into the corner 51 between the walls 50.44 of the ring member 18.

Such heating is performed to a temperature below the melting temperature of the plastic material, but sufficient to cause the plastic to flow under pressure.

The axial spacing between the opposing walls 39 and 50 is such that the portion of the body material 12a is tightly clamped without reducing its thickness, and is dependent on the spacing between the radial opposing walls 36 and 44. The decrease in thickness of the portion 18a is not noticeable.

Heating of the barrels 12a and 12b, radial compression of 12b,
The accompanying plastic flow t causes the body portion 12b to be firmly and airtightly engaged between the radially opposing walls 36 and 44, and the gap or corner 5 between the head members
1, so that the desired airtight seal can be achieved between the container body and the assembly head.

Furthermore, heating removes the plastic memory and increases the structural integrity in the bending areas between the outer wall and 12a and between 12a and 121), thereby separating the chicove body and assembly head during container use. and the structural integrity of the container body against tearing of the body material adjacent the assembly head.

These may be better understood with reference to FIGS. 5 and 6 in conjunction with FIG. 4.

A two-piece assembled head and tube body is shown in FIGS. 5 and 6, which correspond in construction to the components shown in FIGS. 2-4.

The same numerals are therefore used to indicate corresponding parts.

Referring first to FIG. 5, head members 16 and 1
8, the radially opposing walls 36, 44 and the axially opposing walls 39, 50 are separated by a distance corresponding to the wall thickness of the tube body material.

The barrels 12a and 12b are thus held firmly between the corresponding walls without any visible thickness reduction of the material.

If 12a and 12b are not heated in accordance with the present invention, the bends in 12a and 12b across walls 39 and 36 of head member 16 will cause the body material to be stretched in the bend area, as indicated by arrow 56 in FIG. You will be under the stress shown.

This bending and stretching of the body material near the corners between walls 30, 39 and between walls 39, 36 creates voids at corners 51.

Additionally, such bending and stretching causes the trunk at each bend in the direction indicated by straight lines 58 and 60 bisecting the angle between walls 30, 39 and the angle between walls 39, 36 of head member 16, respectively. There will be areas where the material is weak.

These structural characteristics and relationships not only make it easy to form a thick hole between the inside and outside of the container, but also cause the bodies 12a and 12b to come off due to improper tightening, or cause the bodies 12a and 12b to fall out in the direction of straight lines 58 and 60. Both of these are undesirable since the body material may tear at the bent portion of the body material, making it easy for the body and assembly head to separate.

It is also an unacceptable characteristic. Even if the radially opposed walls 36 and 44 face each other at a distance less than the wall thickness of the tube body material, as shown in FIG.
The above problems cannot be overcome.

In fact, the problem of tensile stress is more pronounced at the bend between 12a and 12b as a result of the combined axial elongation and radial compression of 12b during assembly of the head member.

Furthermore, such elongation-compression results in material thinning in the corner areas between the walls 36, 39 of the het culture material 16, which thinning is similar to the thinning in the corresponding corners of the structure shown in FIG. more remarkable than.

Therefore, the tensile stress in the body material between 12a and 12b, along with the thinning described above, reduces the angle between walls 36.39 to 2.
The potential for material tearing across the bend in the direction of the dividing line 60 is increased.

In this structure, the walls 30, 39 of the head member 16
The direction of the straight line 58 that bisects the angle between the tube body 1
It will also be appreciated that a tearing potential exists at the bend between 2 and body end 12a, and that there is an air gap at corner 51 between the inside and outside of the container that aids in mouth formation.

In the structure shown in FIG. 6, although 12b is compressed in the radial direction and becomes somewhat thinner, no plastic flow occurs.

Therefore, the voids present at the corners 51 and other voids caused, for example, by scratches on the walls 44 and 50 or by foreign particles adhering to these walls, are not filled. Dark spots are easily formed.

In light of the foregoing discussion with respect to FIGS. 5 and 6, heating of the plastic material, radial compression of the plastic material, and plastic flow according to the present invention provide the desired air tightness in the connection between the tube body and the assembly head. It can be seen from FIG. 4 that sealing and structural integrity are achieved.

In this regard, by heating the plastic to remove plastic memory and allow plastic flow, the generation of tensile stresses at the bends between the barrels can be avoided, and along lines 58 and 60, the bend areas Furthermore, the tear resistance of the body material at Optimal sealing against leakage of air or contents can be achieved.

Moreover, the plastic flow of the material into the corner 51 maximizes the thickness in the direction of the straight line 60, thus minimizing tearing or breaking of the material in this area.

Furthermore, when a radial force sufficient to pull 12a and 12b out from between the head members is applied to 12a, the body end 12
The retention capacity of the tube body material is increased since the filling of the corners 51 eliminates open spaces in which b can move unhindered.

For example, if a radial force is applied to 12a in the structure shown in FIG. It becomes a space where you can move without being distracted.

It will be appreciated that filling the corner 51, as shown in FIG. 4, creates an obstruction that prevents the withdrawal of the tube body from the assembly head.

The wall thickness of the material of the tube body 12 depends on the application in which the extruded container is used, whether the tube body has a single structure or a laminated sheet I.
It varies depending on many factors, including the type of construction, the type of material used to construct the torso, and so on.

Similarly, the clearance between radially opposing walls 36 and 44 over which tube body material 12b is radially compressed will also vary depending on the body material and tube body construction.

Spacing walls 36 and 44 such that the wall thickness of the body material is reduced by approximately 25% between the walls provides a desirable compressive engagement and sealing relationship between the assembly head and the tube body. .

Head member 1 in the embodiment shown in FIGS. 1 to 4
7 schematically shows how to attach 6.18 to the tube body 12.

That is, a mandrel 62 is provided which is suitably supported for rotation about a mandrel axis.

The mandrel has an abutment flange 64 at one end and a projection 66 at the other end.

This protrusion 66 is smaller in diameter than the mandrel, extends axially from the outer end of the mandrel, and provides an end surface 68 to the mandrel body.
This corresponds to the diameter of the extrusion passage 24 of 6.

First, the head member 16 is placed into the protrusion 66 so that its lower end matches the mandrel end face 68.

The tube body 12 of the container is then introduced onto the mandrel and abuts against the abutment flange 64.

It is determined in advance that the tube body ends extend axially from the wall 39 of the head member by an amount corresponding to the length of 12a and 12b.

The mandrel thus constructed is rotated and the heated forming tool γ0 is moved radially inward to form the tube body 12.
The overlapping portion of the wafer is heated and bent radially inward, that is, to the position shown by the broken line in FIG.

The forming tool 70 is made of nylon, for example, and is heated to remove the memory of the plastic material and to aid in bending and plastic flow of the plastic material, as described above.

After the body material has been bent in this manner, the mandrel is rotated +4 - and the protrusion of the head member 18 is introduced into the groove 32 of the axial head member 16 .

As the head member 18 advances over the head member 16-L, the ring member walls 44,46 and the rounded or chamfered edges 45 therebetween cut the overhang portion 12b of the body material radially inward, the groove 32. move to
It is then moved radially outward facing wall 36 to induce the plastic flow described above.

Preferably, a suitable force applying member 72 is used to tighten the ring member 1.
8 into the groove, and the protrusion 40 is locked into the groove 54 to complete the assembly.

It will be appreciated that assembly can thus be done quickly and inexpensively.

Once assembly is complete, the container can be removed from the mandrel.

That is, since the plastic is heated to a temperature below the melting point of the plastic, there is no heat seal between the body and the assembly, and therefore there is no delay in cooling the product before removing it from the mandrel.

Generally, the cap member is placed on the assembled container before it is removed from the mandrel, so that the container can be filled and sealed at the same time as the container is removed from the mandrel.

FIG. 8 shows another embodiment according to the invention.

In this embodiment, the assembled head includes a first head member 74 of plastic, such as polyethylene, and a second head member 74 of nylon.
It is composed of a head member 76.

Head member 74 has a neck portion 78 that is centrally bored to define an extrusion passageway 80 and has external threads 82 for receiving a sealing cap.

Head member 74 further includes a skirt portion 84 extending from a lower end of neck portion 78 radially outwardly of neck portion 78 and at an axially downward slope relative to the outer end of neck portion 78 .

An annular projection 86 is provided on the underside of the skirt portion 84 and coaxial with the passageway 80 and extending downwardly from the skirt portion.

More specifically, the protrusion 86 has a radially inner wall 88, an outer wall 90, and a bottom wall 92.

Additionally, the skirt extends radially outwardly from the wall 90;
and has a wall 94 that intersects the outer surface 96 of the skirt to form a peripheral outer edge 98 of the skirt.

The second head member γ6 is a ring member having an annular groove that is coaxial with the passage 80 and opens upward in the axial direction to receive the projection 86.

More specifically, this groove is formed on the radially inner wall 10.
0. It has an outer wall 102 and a bottom wall 104 that conforms to the shape of the protruding wall 92.

The groove wall 100 has a diameter that matches the diameter of the inner wall 88 of the mN86 to provide an interference fit with the inner wall 88, and the groove wall 102 has a diameter somewhat larger than the diameter of the outer wall 90 of the protrusion.

As is clear from the embodiments of FIGS. 1 to 4, the wall 90
The clearance between and 102 is somewhat smaller than the wall thickness of the body material.

Therefore, the axial portion 12b of the body 12 is connected to the wall 90.
02 and heated as described above to produce plastic flow, causing walls 90 and 94 of first head member 74 to
The corners between are filled.

In this embodiment, the ring member has an annular outer edge 106 whose diameter corresponds to the inner diameter of the tube body so that it is received axially within the body.

a wall 108 extending radially between groove walls 102 and 106;
is below the skirt wall 94.

Then, the radial portion 12a of the tube body 12 is pressed and engaged between the axially opposing walls 108 and 94 without substantially reducing the wall thickness.

The interference fit between the groove wall 100 and the protrusion wall 88 engages the two members so that they do not separate in the axial direction.

If desired, the groove wall 100 and the protruding wall 88 may be provided with suitable engagement stops to prevent the head members 74 and 76 from separating axially.

From the description of the embodiments shown in FIGS. 1 to 8, it is clear that the engagement relationship between the container body and the assembly head according to the present invention is suitable when the tube shape and the extrusion/rad are connected by adhesive or heat sealing. It will be appreciated that it does not depend on the required compatibility between the materials.

Therefore, although plastic materials are described in connection with the disclosed embodiments, and certain plastics are disclosed as embodiments, the parts of the assembly head are
They can be made from a wide range of plastic materials, which can be thermoplastics or thermosets, from metals such as aluminum, or from a combination of metals and plastics.

The construction of the improved laminated tube body of this invention and the preferred combination of materials for such a body is shown in FIG.

This body configuration is particularly suitable for use in extrusion containers where product permeation and oxygen absorption problems are present.

In FIG. 9, the tube body 110 for the extrusion container is
A barrier layer 11 made of a material that prevents oxygen absorption, such as metal foil.
2 and an inner layer 114 of a thermosetting resin, preferably an epoxy resin, adhered to the barrier layer.

The barrier layer and the thermosetting resin thereon are supplied in sheet form and formed into a tubular cross-sectional shape with opposing circumferentially overlapping sides as shown in FIG.

The tube is then surrounded by an outer layer 116 of a suitable thermoplastic material, for example by extrusion.

Barrier layer 112 provides protection against oxygen absorption and inner layer 1
14 provides optimal protection against product penetration.

That is, thermosetting plastic materials are known to have lower permeability than thermoplastic materials traditionally used for the bodies of such collapsible containers.

Therefore, a tube container with a barrier layer and an inner thermoset plastic layer will give the desired result as far as this problem is concerned, and the overlapping longitudinal edges of the barrier layer and inner layer can be bonded together to form a package using only these two materials. It would also be possible to provide a tube body for the container.

For example, the barrier layer and inner layer may be formed into a tube shape before the thermosetting resin is cured, and the overlapping edges may be pressed together during heating.

It is also possible to hold.

However, it is preferred to encapsulate the barrier layer and the inner layer within the outer layer 116.

This is because the outer layer keeps the barrier layer and inner layer in tube form, so there is no need for longitudinal bonding between the barrier layer and the inner layer, and therefore the tube is This is because problems when molding into the shape can be avoided.

Additionally, by encapsulating the barrier layer and the inner layer, the tube body of the container can have a circular outer surface 118.

This surface 118 is free of circumferential interruptions due to longitudinal seams in the tube body.

This has made it possible to mark the tube body after the tube body is formed, using methods such as roll printing, which cannot be used satisfactorily for tubes with longitudinal seams.

Moreover, the uninterrupted circular shape enhances the aesthetic value of extruded containers using this body.

In the preferred tube body shown in FIG.
12 is aluminum foil approximately 0.002 inches thick, and the preferred epoxy resin is
Hanna Chemistry, Ohio, USA
Product number from ICompany)■-11 or H-2
The outer layer 116 is a low density polyethylene having a thickness of about 0.003 inches.

Regarding the outer layer 116, the barrier layer 112 and the inner layer 114
It will be seen that the thickness of the outer layer differs where the two overlap.

Further regarding the tube container body shown in FIG. 9, although the circular outer surface facilitates printing after the tube is formed, preprinted plastic or paper may be used for the tube body. I guess that's obvious.

If pre-printed 1 is desired, or if for some other reason an additional layer is required between the barrier layer 112 and the outer layer 116, the outer layer of plastic material is molded into a separate tube. Such a monolayer may previously have been adhered to the barrier layer 112.

For example, a preprinted white colored polyethylene film can be adhered to the outer surface of barrier layer 112 to provide desired markings on the container body.

In this case, the low density polyethylene outer layer 116 may be transparent so that the internal markings are visible through the outer layer.

Generally, such preprinted layers have a thickness of about 0.0
It has a thickness of 508 mm (0,002 inches).

FIG. 10 shows a laminated tube body 110 installed in the assembly head shown in FIGS. 2-4.

That is, the radial end 110a of the tube body end is moved radially inwardly of the head member 16 onto the radially extending wall 39.

The axial end 110b of the body material is connected to the head member 16.
is moved by the axial lower blade of the groove 32 to cover the outer wall 36 of the groove.

As 110b is compressed radially between the groove wall 36 and the radially outer wall 44 of the protrusion of the ring member 18, the thickness of 110b is reduced and the material of the outer layer 116 of the laminate is compressed into the corner 5.
It will be understood that plastic flow occurs at 1.

Regarding the assembly shown in FIG. 10, the outer layer 11 of the laminate
6, the corner 51 is compressed in the radial direction of the body portion 110b.
Preferably, it is made of a thermoplastic such as polyethylene so that it can plastically flow.

Referring to the method of assembly, end 110a is removed to remove memory in the thermoplastic, aid in flexing of 110a and 110b, and induce plastic flow for the purposes described above with respect to the embodiment shown in FIGS. 2-4. and 1
Heat 10 b.

If the laminate includes a non-metallic barrier layer, such heating is performed in the manner described in connection with FIG. 7 prior to engaging the two head members.

Alternatively, if the laminate includes a barrier layer of metal foil,
Heating for the above purpose takes place in two separate steps.

110a and 1101) are heated as described in MlllJ while supported on a mandrel, and the body is moved by radial internal force across the wall 39 of member 16, and then a ring member is placed on the head member. 18 is moved axially along wall 36.

Thereafter, the assembled container is heated around the joint between the body and the bottom member by a suitable induction heater 120 schematically shown in FIG.

This induction heater uses a well-known method to inductively heat metal foil.
The thermoplastic layer 116 is then heated by induction.

Such second stage heating ensures the desired plastic flow into the corner 51, resulting in a hermetic seal.

This plastic flow cannot be achieved to an optimum extent by the first stage of heating alone.

That is, during preheating, the metal foil acts as a heat sink and absorbs heat from the thermoplastic resin layer.

During bending of the laminate and bonding of the two head members, such a heat sink effect reduces the temperature of the plastic sufficiently to reduce the plastic flow necessary to obtain the desired seal.

The second heating step is carried out to a temperature below the melting temperature of the plastic, but high enough to cause the plastic to plastically flow when a radial force is applied to the end 11ON of the laminate.

The configuration of the tube container body shown in FIG. It will be appreciated that the extrusion head member may be heat sealed to the extrusion head member.

For example, as shown in Figure 11, the extrusion head part 11
2 has a skirt portion 124 with a circumferentially continuous groove on the underside including an axially extending circular wall 126 and a radially extending and axially inclined wall 128.

The axial end 110c of the tube body 110 is placed in the groove, with the outer end of 110c abutting the outer surface of the outer layer 116 below the groove walls 126 and 128. into the groove.

To heat seal the head component and the outer layer 116: - The rad component is made from a material that is compatible with the outer layer 116.

Therefore, with respect to the preferred construction of Chicove body 110, the rad parts may be polyethylene.

Thus, it will be appreciated that a wide variety of head constructions and mountings will still benefit from the benefits provided by barrier layer 112 and epoxy layer 114.

Although emphasis has been placed here on the preferred embodiments of the invention as shown and described, many embodiments may be made and many more may be made without departing from the essence of the invention. It will be seen that changes can be made.

Therefore, it must be clearly understood that what has been described above is merely illustrative and not limiting of the invention.

[Brief explanation of drawings]

Fig. 1 is an exploded view of the extrusion container of the present invention, Fig. 2 is a view taken along arrow 2-2 in Fig. 1, Fig. 3 is an exploded sectional view of the assembly head parts shown in Fig. 2, and Fig. 4 is a FIG. 2 is a partially enlarged view, FIGS. 5 and 6 are partial cross-sectional views showing the stress relationship in the connecting part, FIG. 7 is a schematic diagram showing the method of connecting the head member and the container body, and FIG. A sectional view showing an embodiment of the assembly head of the invention; FIG. 9 is a cross-sectional view of the tube body of the container of the invention;
Figure 10 shows the Chicove body in Figure 9 as a two-piece assembly.
Partially cutaway side view showing the state in which the rod is pressed and engaged, No. 11
9 is a cross-sectional view of the tube body of FIG. 9 coupled to a head member; FIG. DESCRIPTION OF SYMBOLS 10... Extrusion container of this invention, 12... Tube body part, 12a... Radial direction end part, 12b... Axial direction end part,
14...\rad, 16...1st \rad member, 3
2... Annular groove of the first head member, 34... Groove internal force wall, 36... Groove external force wall, 38... Groove bottom wall, 40...
Rib on groove inner wall, 39...Radial plane wall, 30...
- Outer peripheral edge of first head member, 18... Second head member (ring member), 42... Ring inner wall, 44...
Ring outer wall, 50... Ring plane wall, 51... Corner, 54... Groove that fits into rib 40, 110...
Laminated tube body, 112... barrier layer, 114...
Inner layer, 116...outer layer.

Claims (1)

[Scope of Claims] 1. A tube body having both radially inner and outer surfaces and a radial thickness, and at least the radially outer portion thereof is thermoplastic; and a combination extrusion attached to one end of the tube body. A collapsible extrusion container comprising a head, the assembly head comprising a first head member and a second head member that engage in the axial direction, and at least one of the head members having an extrusion nozzle. , the first head member has an outer wall that is received in an axial direction at one end of the body and engages an inner surface of the body; The tube body has a first wall extending inward in the direction, and an annular second wall extending downward in the axial direction of the tube body from the first wall, and one end of the tube body includes:
The second head member has a first body end portion that overlaps the first wall in the radial direction, and a second body end portion that overlaps the second wall in the axial direction, and the second head member includes Existing in parallel with and at a distance from the first and second walls of the head member, the first and second body ends of the ends of the tube body are connected to the first and second body ends of the tube body. A first wall and a second wall sandwiched between the walls are lockingly engaged with the first and second head members to maintain the assembled relationship between the two members and the first wall and the second wall of the second member. means for maintaining the first wall and the second wall of the first member at intervals, respectively; the first wall and the second wall of the second head member are connected to the first wall at one end of the tube body a corner facing the outer surface of the end portion and the second body end portion between the two walls; radially spaced apart, the second barrel end at one end of the barrel is compressed between the two walls of the brush to a thickness corresponding to the radial space between the second walls; and A collapsible extruded container, characterized in that the material of the outer portion of the body extends into a corner between the first and second walls of the second head member. 2. The first head member and the second head member each have a corresponding third wall located radially inward from the corresponding second wall, and the means axially engages the third wall soil. 2. The crushable push-out container according to claim 1, wherein the first head member and the second rad member are lockingly engaged with each other, the first head member having protrusion-groove means. 3. The first head member includes an extrusion nozzle and has a truncated conical surface surrounding the nozzle and intersecting a third wall of the first head member, and the second head member includes an extrusion nozzle. a ring having a truncated conical surface having radially inward and outward edges intersecting a third wall and a first wall, respectively; when assembled, the third wall has axially upper and lower ends, and the protrusion-groove means is flush with the truncated cone of the first third wall; The crushable extruded container according to claim 2, which is located in a direction from above to below. 4. A crushable extruded container according to claim 1, wherein the tube body is a laminate consisting of a barrier layer, an innermost layer of thermosetting plastic material, and an outermost layer of thermoplastic material. 5. The crushable extruded container according to claim 4, wherein the innermost layer is an epoxy resin. 6. A crushable extruded container according to claim 5, wherein the barrier layer is a metal foil. 7 consisting of a laminated tube body of deformable material including a barrier layer and an innermost layer of thermosetting plastic material, and extrusion head means attached to the end of said body, said head means said A collapsible extruded container comprising a first head member and a second head member having one end of a tube body pressed into engagement therebetween. 8. One of the first head member and the second head member has a means for providing a groove, the remaining head member has a protrusion that fits into the groove, and the protrusion-groove is formed on the body. 8. A collapsible container according to claim 7, having opposing wall means for receiving and compressing one end. 9. The crushable extruded container according to claim 8, wherein the groove and the projection engage in the axial direction of the tube body. 10. The method according to claim 9, wherein the first head member has extrusion nozzle means radially inward of the protrusion and groove with respect to the axis of the tube body, and the second head member is a ring member. A crushable extruded container. 11. The first head member and the ring member are collapsible according to claim 10, wherein the first head member and the ring member have an engaging detent that locks the ring member from axially separating from the first head member. extruded container. 12 said opposing wall means are radial force walls extending in the axial direction of said grooves and protrusions, said radial force walls being radially separated by a distance less than the wall thickness of the tube body; A crushable extruded container according to claim 10. 13 said first head member has a radially outer edge and a radially extending wall between said groove and said radially outer force wall of said first head member; An edge is received axially within one end of the barrel, and the material at one end of the barrel extends inwardly along the radially extending wall and extends radially outwardly of the groove. 13. The collapsible extruded container of claim 12, wherein the ring member has a second wall extending along a wall of the head member and axially overlapping the second wall of the first head member. 14. The crushable extruded container according to claim 13, wherein the innermost layer is an epoxy resin. 15. The crushable extruded container of claim 14, wherein said laminate has an outermost layer of thermoplastic material. 16 comprising a laminate tube body and head means attached to one end of the body, the laminate including a barrier layer and a layer of thermosetting plastic material, the thermosetting plastic material forming the tube body; A crushable extruded container characterized by forming an inner surface of the container. 17. The crushable extrusion container of claim 16, wherein said thermosetting plastic material is an epoxy resin. 18. Claim 17, wherein the barrier layer is a metal foil.
A crushable extruded container as described in Section 1. 19. A collapsible extruded container according to claim 17, wherein the layer of thermoplastic material forms the outer surface of the tube body. 20 Claim 19, wherein the barrier layer is a metal foil
A crushable extruded container as described in Section 1. 21. The crushable extruded container of claim 19, wherein the thermoplastic material provides a seamless outer surface. 22. An extrusion head consisting of a tube body having a wall including a thermoplastic plastic material and having a radial thickness, a first head member received in one end of the tube body, and a coaxial second head member; The head members are radially opposed to each other at a distance smaller than the wall thickness of the tube body and jointly interengage with the axially inner end of the tube body. In the method for manufacturing a crushable extruded container having radially opposing walls whose axial end portions are press-fitted, the tube body and the first member are connected to the upper dL) tube body. supporting an axial portion of the end of the tube body such that it extends axially beyond the wall means on the first member; heating the thermoplastic material under pressure to a flow temperature and moving the body end over the wall on the first head member to axially move the second head member from the first head member; The collapsible material is connected to a collapsible body, the body end being pressed into engagement between the opposing wall means, and the body end being pressurized by the spacing of the opposing wall means to cause the plastic material to flow. A method for manufacturing extruded containers. 23. The manufacturing method according to claim 22, wherein the tube body further includes a metal foil, and the heating of the tube end includes induction heating of the end. 24. The method of claim 23, wherein the end portion is induction heated after connecting the second head member to the first head member. 25. the tube body further comprises a metal foil, and heating the body end heats the body end prior to movement of the body end and after coupling the second head member to the first head member; 23. The manufacturing method according to claim 22, wherein the end portion is heated by induction.