CN2209587Y

CN2209587Y - Die for polyvinyl chloride blown-film

Info

Publication number: CN2209587Y
Application number: CN 94248350
Authority: CN
Inventors: 王德臣
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-12-20
Filing date: 1994-12-20
Publication date: 1995-10-11
Anticipated expiration: 2004-12-20

Abstract

The utility model relates to a mandrel helical flow passage die for polyvinyl chloride blown-film, comprising a die body, a collar extension die inlaid in the upper opening of the die body, a mandrel arranged in the die body, and at least one neck arranged on the die body. The utility model is characterized in that the outer wall of the mandrel is provided with a helical flow passage whose groove depth is from deep to shallow and groove width is from wide to narrow. The utility model has the advantages that the discharging pressure of the die opening is uniform, the uniformity of the film is good, and the material has no staying room in the flow passage. Thereby, the problem that the resolvent adheres to the inner wall of the die is solved, the production efficiency is increased, low temperature extrusion is realized, and the goal of saving energy is achieved.

Description

Die for polyvinyl chloride blown-film

The utility model relates to a kind of core rod type helical flow path blowing polyvinyl chloride film mould that uses on the equipment that adopts blow moulding production plastic sheeting.It comprises die body, and the collar extension mould of insert in die body is suitable for reading is loaded on the plug in the die body and is installed at least one machine neck on the die body.

At present its structure of core rod type mould of generally using of blowing polyvinyl chloride film mould as shown in Figure 1, it mainly is by die body, the collar extension mould of insert in die body is suitable for reading in is loaded on the plug in the die body and is installed in machine neck composition on the die body; Fig. 2 is its plug runner expanded view, as can be seen from the figure the polyvinyl chloride material of fusion enters the central point A place of plug runner through the machine neck, being fan-shaped makes progress along plug, wherein a part of material is extruded die orifice upward to the die orifice direction, and another part material arrives along the covering of the fan half cycle and is extruded die orifice upward to the die orifice direction again after core point B place converges; Because the distance of material flow process is far and near and speed is all inequality; so the polyvinyl chloride material of fusion is in the place, both sides and the very easily sizing decomposition of sharp core place of fan-shaped runner; flow process because of material flow does not wait the pressure difference of being extruded in addition; cause the die orifice discharging inhomogeneous; the film became uneven; locate because of the both sides of fan-shaped runner and the very easily sizing decomposition of sharp core place in addition; and analyte adheres on the inwall of mould; and it is cumulative; production can't be carried out; must shut down cleaning; its production cycle is (clearing up from starting shooting to is one-period) about 24 hours, because the cleaning difficulty of bur is big, cleaning once needs 6～8 hours approximately; also need after the start could drop into ordinary production after about one hour adjustment, this has just directly influenced the raising of production efficiency.

Taper internal orifice mould and the discharging runner between the collar extension mould of insert in die body is suitable for reading because of its plug top is the gap runner of long taper in addition, easily causes the melt extrusion fragmentation, influences the quality of film surface.

The purpose of this utility model provides the more rational core rod type helical flow path of a kind of design blowing polyvinyl chloride film mould with regard to being to overcome above-mentioned weak point of the prior art.

The purpose of this utility model can adopt following measure to realize:

Core rod type helical flow path blowing polyvinyl chloride film mould of the present utility model, it comprises die body, the collar extension mould of insert in die body is suitable for reading, be loaded on the plug in the die body and be installed at least one machine neck on the die body, offer on the outer wall of its plug the degree of depth by dark gradually shallow, width by wide gradually narrow spiral flow channel.

The spiral flow channel of offering on the plug of the present utility model is made up of sprue and the runner that is connected with sprue, and sprue is provided with along the plug horizontal direction, and runner is around upwards shape setting in the shape of a spiral of plug; Sprue can be to be connected with four uniform runners in particular, and four runners upwards constitute four helical flow paths along plug, and four helical flow paths are provided with around 1/2nd weeks of plug separately, by deeply gradually shallow until disappearance.

Also can symmetry offer two helical flow paths on the plug of the present utility model, two helical flow paths are provided with around 2/3rds weeks of plug separately, by deeply gradually shallow until disappearance.

The utility model also can be provided with a cover and be matched with plug by inner conical drogue and answer mould in constitute double-deck in die body, promptly be provided with the mould inner conical drogue between die body and plug, also be processed with on the outer wall of inner conical drogue with the plug outer wall on identical helical flow path; Two machine necks are installed on the die body, and one of them machine neck is connected with helical flow path on the mould inner conical drogue, and another machine neck is connected with helical flow path on the plug.The purpose that this structure is set is for production two-layer compound plastic sheeting, uses as skin to be added with ultra-violet absorber and antioxidant material, and internal layer uses the PVC material that is added with dripless agent, and is ageing-resistant outside producing, and the inside does not have the film that drips mist.

The utility model is for adapting to the needs of producing the different-thickness film, and the lower end of die body is provided with one and can be used to adjust mouthful pad of mould fit clearance.

Discharging runner in the utility model between the taper internal orifice mould on plug top and the insert collar extension mould in die body is suitable for reading is a gap runner wide down, that go up short taper profile.This structure has been avoided the generation of the broken phenomenon of melt extrusion effectively, and the surface quality of film is improved; The mouth mould of this structure also can reduce extrusion pressure, and realization low temperature is extruded, and reaches the purpose of energy savings.

Advantage of the present utility model is:

A, because the utility model changes the fan-shaped runner of prior art into helical flow path (and learns from hydrodynamics, liquid flow velocity is the cube in runner gap), so though the far and near difference of distance is arranged from sprue to each runner, but because sprue broad, darker, mobile distance affects to material is little, prove by test of many times, this structure of the present utility model can make the material of fusion be evenly distributed on the circumference of plug, make die orifice discharging pressure even, thereby guaranteed the uniformity of membrane; In addition because but material does not have stops in helical flow path, thereby solved the problem that analyte adheres to the inwall of mould, through the trial production proof, its production cycle can reach (clearing up from starting shooting to is one-period) more than 20 days, thereby has improved production efficiency greatly;

B, the utility model are changed the long tapered gaps runner that is made of inside and outside mouthful of mould in the prior art and are the down wide transition shape gap runner of short awl, thereby have avoided causing the melt extrusion fragmentation, and the surface quality of film is improved; The mouth mould of this structure also can reduce extrusion pressure, and realization low temperature is extruded, and reaches the purpose of energy savings;

The setting of double-deck interior multiple mould in c, the utility model, can make two extruders is installed on the die body simultaneously, this structure can realize production two-layer compound plastic sheeting needs, use is added with ultra-violet absorber and antioxidant material as skin, internal layer uses the PVC material that is added with dripless agent, it is ageing-resistant to produce the outside, and the inside does not have the film that drips mist.

The drawing of accompanying drawing is described as follows:

Fig. 1 is the front view of prior art.

Fig. 2 is the expanded view of plug runner among Fig. 1.

Fig. 3 is a front view of the present utility model.

Fig. 4 is the expanded view of a kind of embodiment of plug helical flow path among Fig. 3.

Fig. 5 is the expanded view of second kind of embodiment of the utility model plug helical flow path.

Fig. 6 is a kind of embodiment of mandrel structure in the utility model.

Fig. 7 is the embodiment of mould inner conical drogue structure in the utility model.

Fig. 8 is second kind of embodiment of mandrel structure in the utility model.

The utility model is done with detailed description below with reference to embodiment (accompanying drawing):

As shown in Figure 3, core rod type helical flow path blowing polyvinyl chloride film mould of the present utility model is by die body (1), the collar extension mould (3) of pressured ring (2) insert in die body is suitable for reading, be loaded on mould inner conical drogue (6) in the die body and the plug (5) in plug-in mounting and the mould inner conical drogue, and two machine necks (7) that symmetry is installed on the die body are formed.All offer on the outer wall of its mould inner conical drogue (6) and plug (5) (Fig. 6, shown in Figure 7) degree of depth by dark gradually shallow, width by wide gradually narrow spiral flow channel (8), this spiral flow channel is made up of sprue and four uniform runners being connected with sprue, sprue is provided with along the plug horizontal direction, and runner is around upwards shape setting in the shape of a spiral of plug; That is to say that four runners upwards constitute four helical flow paths along plug, four helical flow paths are provided with around 1/2nd weeks of plug separately, by deeply gradually shallow, by wide gradually narrow until disappearing (as shown in Figure 4).

The utility model is for adapting to the needs of producing the different-thickness film, and the lower end of die body (1) is provided with one and can be used to adjust mouthful pad of mould fit clearance (9).

Discharging between the taper internal orifice mould (4) on plug in the utility model (5) top and the insert collar extension mould (3) in die body is suitable for reading causes the melt extrusion fragmentation, and the surface quality of film is improved; Runner is a gap runner wide down, that go up short taper profile.This structure has been avoided the generation of the broken phenomenon of melt extrusion effectively, and the surface quality of film is improved; The mouth mould of this structure also can reduce extrusion pressure, and realization low temperature is extruded, and reaches the purpose of energy savings.

As Fig. 5, shown in Figure 8, also can symmetry offer two helical flow paths (10) on the plug of the present utility model (5), two helical flow paths are provided with around 2/3rds weeks of plug separately, by deeply gradually shallow until disappearance.

Mould of the present utility model is if adopt an extruding machine job, the desirable plug that goes out the mould inner conical drogue and be mated, and it is bigger to change diameter, and the plug that can directly match with the die body inner headed face gets final product.

Claims

1, a kind of core rod type helical flow path blowing polyvinyl chloride film mould, it comprises die body (1), the collar extension mould (3) of insert in die body is suitable for reading, be loaded on the plug (5) in the die body (1) and be installed at least one machine neck (7) on the die body, it is characterized in that: offer on the outer wall of plug (5) degree of depth by dark gradually shallow, width by wide gradually narrow spiral flow channel (8).

2, core rod type helical flow path blowing polyvinyl chloride film mould according to claim 1, it is characterized in that: the spiral flow channel of offering on the plug (5) (8) is made up of sprue and the runner that is connected with sprue, sprue is provided with along the plug horizontal direction, and runner is around upwards shape setting in the shape of a spiral of plug.

3, core rod type helical flow path blowing polyvinyl chloride film mould according to claim 2, it is characterized in that: sprue is connected with four uniform runners, article four, runner upwards constitutes four helical flow paths along plug (5), article four, helical flow path is provided with around (5) 1/2nd weeks of plug separately, by deeply gradually shallow until disappearance.

4, core rod type helical flow path blowing polyvinyl chloride film mould according to claim 1, it is characterized in that: plug (5) is gone up symmetry and is offered two helical flow paths (10), article two, helical flow path is provided with around 2/3rds weeks of plug separately, by deeply gradually shallow until disappearance.

5, core rod type helical flow path blowing polyvinyl chloride film mould according to claim 1, it is characterized in that: between die body (1) and plug (5), be provided with mould inner conical drogue (6), inner conical drogue (6) match with excellent core (5) constitute double-deck in multiple mould, also be processed with on the outer wall of inner conical drogue (6) with the plug outer wall on identical helical flow path (8).

6, core rod type helical flow path blowing polyvinyl chloride film mould according to claim 5, it is characterized in that: two machine necks (7) are installed on the die body (1), one of them machine neck is connected with helical flow path on the mould inner conical drogue, and another machine neck is connected with helical flow path on the plug.

7, core rod type helical flow path blowing polyvinyl chloride film mould according to claim 1, it is characterized in that: the lower end of die body (1) is provided with one and can be used to adjust mouthful pad of mould fit clearance (9).

8, core rod type helical flow path blowing polyvinyl chloride film mould according to claim 1 is characterized in that: the discharging runner between the taper internal orifice mould (4) on plug (5) top and the insert collar extension mould (3) in die body is suitable for reading is a gap runner wide down, that go up short taper profile.