CN111590860A - 7-layer co-extrusion PVDC film blowing mold - Google Patents
7-layer co-extrusion PVDC film blowing mold Download PDFInfo
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- CN111590860A CN111590860A CN202010532069.4A CN202010532069A CN111590860A CN 111590860 A CN111590860 A CN 111590860A CN 202010532069 A CN202010532069 A CN 202010532069A CN 111590860 A CN111590860 A CN 111590860A
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- layer
- mold
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- flow channel
- die
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
- B29C48/307—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets specially adapted for bringing together components, e.g. melts within the die
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/49—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using two or more extruders to feed one die or nozzle
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to the technical field of plastic film production equipment, and discloses a 7-layer co-extrusion PVDC film blowing mold which comprises a mold body, wherein a vertical mold core is arranged on the upper end surface of the mold body, a seventh layer mold head, a sixth layer mold head, a fifth layer mold head, a fourth layer mold head, a third layer mold head, a second layer mold head and a first layer mold head are sequentially sleeved on the mold core from top to bottom, the structures of the first layer mold head, the second layer mold head, the third layer mold head, the fourth layer mold head, the fifth layer mold head, the sixth layer mold head and the seventh layer mold head are the same, the mold comprises a plane flow channel layer and a spiral body, the inlet end of the spiral body is concentrically matched with the outlet end of the plane flow channel layer, the plane flow channel layer of the first layer mold head is superposed on the upper end surface of the mold body, the mold can realize PA or EVOH raw material co-extrusion, the internal structure of the mold adopts the plane flow channel to be matched with, but also reduces the residual decomposition of the raw materials.
Description
Technical Field
The invention relates to the technical field of plastic film production equipment, in particular to a 7-layer co-extrusion PVDC film blowing mold.
Background
PVDC is an ideal packaging material with high barrier property, strong toughness, low-temperature heat sealing, good heat shrinkage and good chemical stability, is unique in the packaging industry, particularly has the performances of moisture resistance, oxygen resistance, moisture resistance, acid and alkali resistance, oil immersion resistance, multiple chemical solvent resistance and the like, and is widely used for packaging foods, medicines and military products for 50 years.
The co-extrusion film blowing mold is a mold for extruding a plurality of molten plastic materials together to form an annular film, and the extrusion direction can be upward or downward. The 7-layer film is a film with a wider application range, the existing co-extrusion PVDC blown film mold has a complex structure, and raw materials are easy to remain in the mold, so that the product quality is influenced to a certain extent.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a 7-layer co-extrusion PVDC blown film mold.
In order to achieve the purpose, the invention adopts the following technical scheme:
a7-layer co-extrusion PVDC film blowing mold comprises a mold body, wherein a vertical mold core is arranged on the upper end face of the mold body, a seventh layer mold head, a sixth layer mold head, a fifth layer mold head, a fourth layer mold head, a third layer mold head, a second layer mold head and a first layer mold head are sequentially sleeved on the mold core from top to bottom, the first layer mold head, the second layer mold head, the third layer mold head, the fourth layer mold head, the fifth layer mold head, the sixth layer mold head and the seventh layer mold head are identical in structure and respectively comprise a plane flow channel layer and a spiral body, the inlet end of the spiral body is concentrically matched with the outlet end of the plane flow channel layer, the plane flow channel layer of the first layer mold head is overlapped on the upper end face of the mold body, the plane flow channel layer of the second layer mold head is overlapped on the upper end of the spiral body of the first layer mold head, the plane flow channel layer of the third layer mold head is overlapped on the upper end of the spiral body of the second layer mold head, the plane, the upper end of the spiral body of the seventh layer of die head is connected with an adjusting die cover, the top end of the die core is connected with a die opening through threads, the die opening is positioned on the inner side of the adjusting die cover, and a molding cavity is arranged between the die opening and the adjusting die cover;
the die body, the die opening, the adjusting die cover, the seventh layer die head, the sixth layer die head, the fifth layer die head, the fourth layer die head, the third layer die head, the second layer die head and the first layer die head are all made of 0Cr17Ni4Cu4Nb stainless steel.
Preferably, the planar flow channel layer is provided with a planar flow channel, the planar flow channel of the planar flow channel layer is subjected to three-time flow splitting, the main feeding flow channel flows into two arc flow channels through the end part of one arc flow channel, then flows into four arc flow channels from the end parts of the two arc flow channels, and the end parts of the four arc flow channels form eight flow splitting ports.
Preferably, eight spiral flow channels which are uniformly distributed are arranged on the conical surface of the spiral body.
Preferably, the conical surface of the spiral body is provided with a PVDC branch flow channel or a PVDC special flow channel.
Preferably, the inlet end of the spiral flow channel is matched with the flow dividing port of the plane flow channel.
Preferably, the plane runner adopts a gradually-changed aperture, the main feeding runner is a fillet, a concave counter bore is arranged on the plane runner layer, and the concave counter bore converges with the main feeding runner.
Preferably, the end face of the die opening is provided with a countersunk concave inner hexagon.
The invention has the beneficial effects that:
1. the mould can produce incompatible raw materials for composite molding.
2. The main material of the die is 0Cr17Ni4Cu4Nb stainless steel, so that the problem of PVDC corrosivity is solved.
3. The die can realize co-extrusion of PA or EVOH raw materials.
4. The internal structure of the mould adopts the matching of a plane runner and a taper spiral runner, thereby not only ensuring the molecular chain connection mixing property of the raw materials, but also reducing the residual decomposition of the raw materials.
5. The raw materials are fed by adopting PVDC branch flow channels without residues, and the flow channels adopt a structure of firstly branching and shearing and then converging, so that the PVDC branch flow channel has the functions of shunting and reducing pressure and also provides a mixing barrier.
6. The runner of the die is suitable for 4 materials of PA, PP, PE and EVOH, and replaces the traditional single runner.
Drawings
FIG. 1 is a schematic structural diagram of a 7-layer co-extrusion PVDC blown film mold according to the present invention in a front view;
FIG. 2 is a schematic view of a planar flow channel structure of a 7-layer co-extrusion PVDC blown film mold according to the present invention;
FIG. 3 is a schematic structural diagram of a spiral flow channel of a 7-layer co-extrusion PVDC blown film mold provided by the invention;
FIG. 4 is a schematic structural diagram of a PVDC branch flow channel of a 7-layer co-extrusion PVDC blown film mold according to the present invention;
fig. 5 is a schematic structural view of a PVDC dedicated flow channel of a 7-layer co-extrusion PVDC blown film die according to the present invention.
In the figure: the die comprises a die body 1, a first layer of die head 2, a second layer of die head 3, a third layer of die head 4, a fourth layer of die head 5, a fifth layer of die head 6, a sixth layer of die head 7, a seventh layer of die head 8, a die opening 9, an adjusting die cover 10, a plane runner 11, a spiral runner 12, a PVDC branch runner 13 and a PVDC special runner 14.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-5, a 7-layer co-extrusion PVDC blown film mold comprises a mold body 1, a vertical mold core is arranged on the upper end surface of the mold body 1, a seventh layer of mold head 8, a sixth layer of mold head 7, a fifth layer of mold head 6, a fourth layer of mold head 5, a third layer of mold head 4, a second layer of mold head 3 and a first layer of mold head 2 are sequentially sleeved on the mold core from top to bottom, the first layer of mold head 2, the second layer of mold head 3, the third layer of mold head 4, the fourth layer of mold head 5, the fifth layer of mold head 6, the sixth layer of mold head 7 and the seventh layer of mold head 8 have the same structure and respectively comprise a plane flow channel layer and a spiral body, the inlet end of the spiral body is concentrically matched with the outlet end of the plane flow channel layer, the plane flow channel layer of the first layer of mold head 2 is overlapped on the upper end surface of the mold body 1, the plane flow channel layer of the second layer of mold head 3 is overlapped on the spiral body of the first layer of mold head, the plane flow channel layer of the fourth layer of die head 5 is superposed on the upper end of the spiral body of the third layer of die head 4, the plane flow channel layer of the fifth layer of die head 6 is superposed on the upper end of the spiral body of the fourth layer of die head 5, the plane flow channel layer of the sixth layer of die head 7 is superposed on the upper end of the spiral body of the fifth layer of die head 6, the plane flow channel layer of the seventh layer of die head 8 is superposed on the upper end of the spiral body of the sixth layer of die head 7, a taper gap is formed between the plane flow channel of the adjacent die head and the spiral body, the upper end of the spiral body of the seventh layer of die head 8 is connected with an adjusting die cover 10, the top end of the die core is connected with a die orifice 9 through threads, the die orifice 9 is;
the die body 1, the die opening 9, the adjusting die cover 10, the seventh layer die head 8, the sixth layer die head 7, the fifth layer die head 6, the fourth layer die head 5, the third layer die head 4, the second layer die head 3 and the first layer die head 2 are all made of 0Cr17Ni4Cu4Nb stainless steel.
Further, the plane runner layer is provided with a plane runner 11, the plane runner 11 of the plane runner layer is divided for three times, the main feeding runner flows into two arc runners through the end part of one arc runner, and then flows into four arc runners from the end parts of the two arc runners, and the end parts of the four arc runners form eight branch ports.
Furthermore, eight spiral flow channels 12 which are uniformly distributed are arranged on the conical surface of the spiral body.
Further, a PVDC branch flow channel 13 or a PVDC dedicated flow channel 14 is arranged on the conical surface of the spiral body, as shown in fig. 4, a branch point exists on the flow channel of the PVDC branch flow channel 11, the flow channel adopts a structure of branching, shearing and then converging, has the functions of flow dividing and pressure reducing, and provides a mixing barrier, as shown in fig. 5, the flow channel is in a central spiral shape, and the PVDC dedicated flow channel is suitable for PVDC or some raw materials with relatively high viscosity.
Further, the inlet end of the spiral flow channel 12 is matched with the branch opening of the plane flow channel 11.
Further, the plane runner 11 adopts a gradually-changed aperture, the main feeding runner is a 90-degree fillet, a concave counter bore is arranged on the plane runner layer, and the concave counter bore converges with the main feeding runner.
Furthermore, the end face of the die opening 9 is provided with a countersunk concave inner hexagon.
In this embodiment, when the mold is used, different raw materials are injected through different die heads, and when the raw materials contain PVDC, the spiral body provided with the spiral flow channel 10 can be replaced by a spiral body provided with the PVDC branch flow channel 11 or the PVDC dedicated flow channel 12, and such flow channel adopts a structure that branches first and then joins, so that the mold has the functions of flow dividing and pressure reducing, and simultaneously provides a mixing barrier, reduces the residue of PVDC, and improves the quality of products.
The bottom of the die is provided with a countersunk concave hole for adding opening powder to enter a first layer flow channel of the die, so that the effect of smoothing an inner layer film is achieved, and the traditional screw mixing process after raw materials are added is replaced; the mold is suitable for up-blowing and down-blowing processes.
The structural size of the die can be processed according to the specification of the film, and the die is applied to the production of high-barrier functional films.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. A7-layer co-extrusion PVDC film blowing mold comprises a mold body (1) and is characterized in that a vertical mold core is arranged on the upper end face of the mold body (1), a seventh layer of mold head (8), a sixth layer of mold head (7), a fifth layer of mold head (6), a fourth layer of mold head (5), a third layer of mold head (4), a second layer of mold head (3) and a first layer of mold head (2) are sequentially sleeved on the mold core from top to bottom, the first layer of mold head (2), the second layer of mold head (3), the third layer of mold head (4), the fourth layer of mold head (5), the fifth layer of mold head (6), the sixth layer of mold head (7) and the seventh layer of mold head (8) have the same structure and respectively comprise a plane flow channel layer and a spiral body, the inlet end of the spiral body is concentrically matched with the outlet end of the plane flow channel layer, the plane flow channel layer of the first layer of mold head (2) is superposed on the, the plane flow channel layer of the second layer of die head (3) is superposed at the upper end of the spiral body of the first layer of die head (2), the plane flow channel layer of the third layer of die head (4) is superposed at the upper end of the spiral body of the second layer of die head (3), the plane flow channel layer of the fourth layer of die head (5) is superposed at the upper end of the spiral body of the third layer of die head (4), the plane flow channel layer of the fifth layer of die head (6) is superposed at the upper end of the spiral body of the fourth layer of die head (5), the plane flow channel layer of the sixth layer of die head (7) is superposed at the upper end of the spiral body of the fifth layer of die head (6), the plane flow channel layer of the seventh layer of die head (8) is superposed at the upper end of the spiral body of the sixth layer of die head (7), a taper gap is formed between the plane flow channel of the adjacent die head and the spiral body, the upper end of the spiral body of the seventh layer of, the die orifice (9) is positioned on the inner side of the adjusting die cover (10), and a forming cavity is arranged between the die orifice (9) and the adjusting die cover (10);
the die body (1), the die opening (9), the adjusting die cover (10), the seventh layer die head (8), the sixth layer die head (7), the fifth layer die head (6), the fourth layer die head (5), the third layer die head (4), the second layer die head (3) and the first layer die head (2) are all made of 0Cr17Ni4Cu4Nb stainless steel.
2. The 7-layer co-extrusion PVDC blown film mold according to claim 1, wherein the planar flow channel layer is provided with a planar flow channel (11), the planar flow channel (11) of the planar flow channel layer is divided into three times, the main feed flow channel flows into two circular arc flow channels through the end part of one circular arc flow channel, and then flows into four circular arc flow channels from the end parts of the two circular arc flow channels, and the end parts of the four circular arc flow channels form eight branch ports.
3. The 7-layer co-extrusion PVDC blown film mold according to claim 2, characterized in that eight uniformly distributed spiral flow channels (12) are arranged on the conical surface of the spiral body.
4. The 7-layer co-extrusion PVDC blown film mold according to claim 1, characterized in that a PVDC branch flow channel (13) or a PVDC special flow channel (14) is arranged on the conical surface of the spiral body.
5. A 7-layer co-extrusion PVDC blown film die according to claim 3, characterized in that the inlet end of the spiral flow channel (12) is adapted to the flow splitting opening of the planar flow channel (11).
6. The 7-layer co-extrusion PVDC blown film mold according to claim 2, wherein the planar flow channel (11) adopts a gradually-changing aperture, the main feeding flow channel is a 90-degree circular bead, the planar flow channel layer is provided with a concave countersunk hole, and the concave countersunk hole and the main feeding flow channel converge.
7. The 7-layer co-extrusion PVDC blown film die according to claim 1, characterized in that the end face of the die orifice (9) is provided with a hexagon socket head in a countersunk concave surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010532069.4A CN111590860A (en) | 2020-06-11 | 2020-06-11 | 7-layer co-extrusion PVDC film blowing mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010532069.4A CN111590860A (en) | 2020-06-11 | 2020-06-11 | 7-layer co-extrusion PVDC film blowing mold |
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| Publication Number | Publication Date |
|---|---|
| CN111590860A true CN111590860A (en) | 2020-08-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010532069.4A Pending CN111590860A (en) | 2020-06-11 | 2020-06-11 | 7-layer co-extrusion PVDC film blowing mold |
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| CN (1) | CN111590860A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101670657A (en) * | 2009-09-29 | 2010-03-17 | 武汉新中德塑料机械有限公司 | Triple extrusion die head with low center |
| CN106915052A (en) * | 2017-04-01 | 2017-07-04 | 苏州星贝尔中空成型科技股份有限公司 | Six layers of co-extrusion die head in blow molding machine |
| CN208324151U (en) * | 2018-03-30 | 2019-01-04 | 浙江众成包装材料股份有限公司 | A kind of superposed multilayer co-extrusion die head |
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2020
- 2020-06-11 CN CN202010532069.4A patent/CN111590860A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101670657A (en) * | 2009-09-29 | 2010-03-17 | 武汉新中德塑料机械有限公司 | Triple extrusion die head with low center |
| CN106915052A (en) * | 2017-04-01 | 2017-07-04 | 苏州星贝尔中空成型科技股份有限公司 | Six layers of co-extrusion die head in blow molding machine |
| CN208324151U (en) * | 2018-03-30 | 2019-01-04 | 浙江众成包装材料股份有限公司 | A kind of superposed multilayer co-extrusion die head |
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Application publication date: 20200828 |