Forming mold for making polyvinyl chloride foamed wood-like slats

A forming mold for making polyvinyl chloride foamed wood-like slats includes an inlet, an outlet, and two main flow passages symmetrically arranged with respect to a central axis. The main flow passages each have an inlet section respectively connected to the inlet and an outlet section respectively connected to the outlet. The extension direction of the inlet section of each main flow passage respectively defines with the central axis an included angle therebetween. The sum of the angles of the two included angles ranges from 44.2 to 48.8 degrees. The width of the main flow passages gradually increases from the inlet toward the outlets. The height of the main flow passages gradually reduces from the inlet toward the outlets. In this way, the forming mold of the present invention can effectively improve production efficiency and can increase the stability of the product manufacturing process.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to slat forming technology and more particularly, to a forming mold for making polyvinyl chloride foamed wood-like slats.

2. Description of the Related Art

In the past, curtain slats were mainly made of aluminum or iron flakes after being processed into curved sections, and then painted on the surface. However, such conventional slats have the disadvantages of high raw material costs, heavy weight of the finished product, and easy absorption of heat, resulting in poor thermal insulation effects. In order to improve the above problems, some developers have developed slats made of plastic raw materials such as polyvinyl chloride foam materials to achieve the goals of cost reduction, light weight, and good thermal insulation. However, the forming molds currently used for making PVC foamed slats mainly use a one-in-one-out design, that is, there is only one inlet and one outlet, which will cause the problem of low production efficiency.

SUMMARY OF THE INVENTION

The present invention has been accomplished under the circumstances in view. It is the main object of the present invention to provide a forming mold for making polyvinyl chloride foamed wood-like slats, which can effectively improve production efficiency.

To achieve this and other objects of the present invention, a forming mold for making polyvinyl chloride foamed wood-like slats comprises an inlet, an outlet, and two main flow passages symmetrically arranged with respect to a central axis. The main flow passages each have an inlet section and an outlet section. The inlet section of each main flow passage is connected to the inlet. The extension direction of the inlet section of each main flow passage respectively defines with the central axis a first included angle therebetween. The sum of the angles of the two first included angles ranges from 44.2 to 48.8 degrees. The outlet sections of the main flow passages each have one end respectively connected to one respective outlet. Furthermore, the width of each main flow passage gradually increases from the inlet toward the outlets, and the height of each main flow passage gradually reduces from the inlet toward the outlets.

As can be known from the above, the forming mold of the present invention uses a one-in two-out design and is matched with the symmetrical configuration of the two main flow passages to effectively improve production efficiency and to make the manufactured product have the characteristics of stable quality.

Preferably, the height of the inlet section of each main flow passage is consistent from beginning to end.

Preferably, the width of the outlet section of each main flow passage is consistent from beginning to end, the extending direction of the outlet section of each main flow passage is parallel to the central axis, and the height of the outlet section of each main flow passage is consistent from beginning to end.

Preferably, the two main flow passages each comprise a front connection section connected to the associating inlet section, a rear connection section connected to the associating outlet section, and a middle connection section connected between the front connection section and the rear connection section. The height of the front connection section of each main flow passages gradually reduces from the associating inlet section toward the associating middle connection section, and the width of the front connection sections is consistent from beginning to end. The extension direction of each front connection section respectively defines with the central axis a second included angle therebetween, and the sum of the angles of the two second included angles ranges from 36.9 to 61.9 degrees. The height of the middle connection section of each main flow passages gradually reduces from the associating front connection section toward the associating rear connection section, and the width of the middle connection section of each main flow passage gradually increases from the associating front connection section toward the associating rear connection section. A third included angle is respectively defined between the extension direction of the inner wall of each of the two middle connection sections and the central axis, and the sum of the angles of the two third included angles ranges from 5.7 to 8.6 degrees. A fourth included angle is respectively defined between the extension direction of the outer wall of each of the two middle connection sections and the central axis, and the sum of the angles of the two fourth included angles ranges from 28.1 to 41.1 degrees. The height of the rear connection section of each main flow passages gradually reduces from the associating middle connection section toward the associating outlet section, and the width of the rear connection section of each main flow passages is consistent from beginning to end. With the above technical characteristics, after the polyvinyl chloride foam material is injected into the inlet, the polyvinyl chloride foam material can quickly and stably pass through the main flow passages, and then the shape of the product is formed from the outlet.

Preferably, the forming mold further comprises a sub flow passage and two branch flow passages. The sub flow passage is located between the rear connection sections of the two main flow passages and extends straight down from the top surface of the forming mold. The two branch flow passages each have one end thereof respectively communicating with the rear connection sections of the two main flow passages, and an opposite end thereof commonly communicating with the bottom end of the sub flow passage. With the above technical characteristics, a skin material is injected into the sub flow passage, and then the skin material flows from the sub flow passage through the two branch flow passages to the rear connection sections of the two main flow passages respectively, and the skin material is then mixed with the polyvinyl chloride foam material passing therethrough to form the skin layer of the product.

The detailed structure, characteristics, assembly or use method of the forming mold for making polyvinyl chloride foamed wood-like slats provided by the present invention will be described in the detailed description of the subsequent preferred embodiment. However, those with ordinary skill in the art of the present invention should be able to understand that the detailed descriptions and the specific preferred embodiment listed in the implementation of the present invention are only used to illustrate the present invention and are not intended to limit the scope of the patent application of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

The applicant first explains here, in the entire specification, including the preferred embodiment and the drawings, the terms related to directionality are based on the directions in the drawings. Second, in the embodiment and the drawings to be described below, the same component numbers represent the same or similar components or their structural features.

Referring toFIG. 1andFIG. 2, a forming mold10has one inlet12and two outlets14, wherein the inlet12has an opening angle α between 105 and 115 degrees (seeFIG. 3). The forming mold10of the present invention further has two main flow passages16, and the two main flow passages16are symmetrically arranged with respect to a central axis A. The height of the two main flow passages16gradually decreases from the inlet12toward the outlets14(seeFIG. 2). The width of the two main flow passages16gradually increases from the inlet12toward the outlets14(seeFIG. 1).

Furthermore, the two main flow passages16each have an inlet section18. The inlet sections18of the two main flow passages16each have one end thereof commonly connected to the inlet12, as shown inFIG. 4andFIG. 5. The cross-sectional shape of the two inlet sections18is trapezoidal. The height H1aof the inner wall of the two inlet sections18is 20 mm, and the height H1bof the outer wall of the two inlet sections18is 14.01 mm, both of which are consistent from beginning to end. As for the width W1of the two inlet sections18is also consistent from beginning to end (W1is 42 mm in this embodiment). In addition, as shown inFIG. 3, the length direction of the two inlet sections18and the central axis A respectively have a first included angle θ1, and the sum of the angles of the two first included angles θ1ranges from 44.2-48.8 degrees (The smallest sum of angles is 44.2 degrees, and the largest sum of angles is 48.8 degrees).

As shown inFIGS. 1 and 2, the two main flow passages16each have an outlet section20, the outlet section20of each of the two main flow passages16has one end thereof connected to one respective outlet14. The two outlet sections20have a rectangular cross-sectional shape. As shown inFIGS. 16 and 17, the height H2of the two outlet sections20is consistent from beginning to end (the height H2in this embodiment is 2.8 mm). The width W2of the two outlet sections20is consistent from beginning to end (the width W2in this embodiment is 51 mm). In addition, as shown inFIG. 15, the extending direction of the two outlet sections20is parallel to the central axis A.

As shown inFIG. 1andFIG. 2, each main flow passage16has a front connection section22, a middle connection section24and a rear connection section26. One end of the front connection section22is connected to the inlet section18, and the middle connection section24is connected between the front connection section22and the rear connection section26. One end of the rear connection section26is connected to the outlet section20.

As shown inFIG. 7andFIG. 8, the height H3of the front connection section22gradually reduces from the inlet section18toward the middle connection section24(the height H3in this embodiment gradually reduces from 19.99 mm to 13.4 mm), and the width W3of the front connection section22is consistent from beginning to end (the width W3in this embodiment is 44 mm). In addition, as shown inFIG. 6, a second included angle θ2is respectively defined between the extension direction of each of the two front connection sections22and the central axis A. The sum of the angles of the two second included angles θ2ranges from 36.9 to 61.9 degrees (the minimum total is 36.9 degrees, and the maximum total angle is 61.9 degrees).

As shown inFIG. 10andFIG. 11, the height H4of the middle connection section24gradually reduces from the front connection section22toward the rear connection section26(the height H4in this embodiment gradually reduces from 13.4 mm to 8.4 mm), and the width W4of the middle connection section24gradually increases from the front connection section22toward the rear connection section26(the width W4in this embodiment gradually increases from 44 mm to 51 mm). Furthermore, as shown inFIG. 9, a third included angle θ3is respectively defined between the extension direction of the inner wall of each of the two middle connection sections24and the central axis A. The sum of the angles of the two third included angles θ3ranges from 5.7 to 8.6 degrees (the minimum total is 5.6 degrees, and the maximum total angle is 8.6 degrees). A fourth included angle θ4is respectively defined between the extension direction of the outer wall of each of the two middle connection sections24and the central axis A. The sum of the angles of the two fourth included angles θ4ranges from 28.1 to 41.1 degrees (the minimum total is 28.1 degrees, and the maximum total is 41.1 degrees).

As shown inFIGS. 12-14, the height H5of the two rear connection sections26respectively gradually reduces from the respective middle connection section24toward the respective outlet section20(the height H5in this embodiment gradually reduces from 8.2 mm to 2.4 mm), and the width W5of the rear connection section25gradually increases from the middle connection section24toward the outlet section20(the width W5in this embodiment gradually increases from 50.6 mm to 51 mm).

On the other hand, as shown inFIG. 1, the forming mold10of the present invention is composed of six die blocks, which are, sequentially from front to back, the first die block32, the second die block34, the third die block36, the fourth die block38, the fifth die block40, and the sixth die block42. In terms of length, the length L1of the first die block32is 70 mm, the length L2of the second die block34is 25-35 mm, the length L3of the third die block36is 20-30 mm, the length L4of the fourth die block38is 20-30 mm, the length L5of the fifth die block40is 25-30 mm, and the length L6of the sixth die block42is 30-40 mm. In addition to the configuration of the main flow passages16, the inlet12is located at first die block32, the inlet sections18are located at the first die block32and the second die block34, the front connection sections22are located at the third die block36, the middle connection sections24are located at the fourth die block38, the rear connection sections26are located at the fifth die block40, and the outlet sections20are located at the sixth die block42.

In addition, as shown inFIG. 1andFIG. 2, the forming mold10of the present invention further has a sub flow passage28and two branch flow passages30. The sub flow passage28is located between the rear connection sections26of the two main flow passages16and extends straight down from the top surface of the fifth die block40. One end of the two branch flow passages30communicates with the bottom end of the sub flow passage28, and the other end of the two branch flow passages30communicates with the rear connection sections26of the two main flow passages16in a one-to-one manner.

In use, the polyvinyl chloride foam material with a specific gravity of 1.550-1.750 and high foaming characteristics is injected into the inlet12, and then the polyvinyl chloride foam material flows from the inlet12to the two main flow passages16. Then, in the process of flowing through two main flow passages16, on the one hand, by the change in height of the two main flow passages16and on the other hand, by the change in width and angle of the two main flow passages16, the polyvinyl chloride foam material is gradually squeezed, and the product shape is formed when the polyvinyl chloride foam material is finally discharged by two outlets14. As for the size of the product is 63.5 mm±0.2 mm (width)×2.8 mm±0.1 mm (thickness), the weight is 28 g±1 g per inch, and the surface hardness is more than 85A Shore. In addition, in the process of the polyvinyl chloride foam material flowing through the two main flow passages16, a skin material (such as PVC, ABS, ASA, etc.) with a specific gravity of 1.450 to 1.650 and high strength and low foaming characteristics is injected into the sub flow passage28, so that the skin material flows from the sub flow passage28through the two branch flow passages30to the rear connection sections26of the two main flow passages16respectively, and the skin material is then mixed with the polyvinyl chloride foam material passing therethrough to form the skin layer of the product.

In conclusion, the forming mold10of the present invention uses a one-in two-out design and is matched with the symmetrical configuration and special angle design of the two main flow passages16to allow the PVC foam material to pass through quickly and stably so as to form the shape of the product and make the manufactured product have the characteristics of light weight, good hardness, strong rigidity and stable quality.